CN111661995A - Oil-based drilling waste recycling and harmless treatment system and method - Google Patents
Oil-based drilling waste recycling and harmless treatment system and method Download PDFInfo
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- CN111661995A CN111661995A CN202010474180.2A CN202010474180A CN111661995A CN 111661995 A CN111661995 A CN 111661995A CN 202010474180 A CN202010474180 A CN 202010474180A CN 111661995 A CN111661995 A CN 111661995A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0036—Multiple-effect condensation; Fractional condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0093—Removing and treatment of non condensable gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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Abstract
A system and method for recycling and harmlessly treating oil-based drilling waste. The system comprises: a mixing device; the thermal separator is respectively connected with the mixing device and the driving device, and a moving part is arranged in the thermal separator; the dust removal device is connected with the hot separator and is arranged to capture and deposit powdery solid phase carried by mixed steam of oil and water from the hot separator at the bottom of the dust removal device; and the condensing tank is connected with the dust removal device and is used for condensing oil steam and water vapor in the mixed steam from the dust removal device. The system can effectively realize the separation of oil, water and solid phases, the oil obtained by recovery can be used for repeatedly preparing the oil-based mud, the oil content of the obtained solid waste is low, the energy consumption is low, the cost is low, and secondary pollution is avoided.
Description
Technical Field
The application relates to a harmless treatment technology of oil-containing solid waste of an oil field, in particular to a system and a method for recycling and harmlessly treating oil-based drilling waste.
Background
In the last two decades, China has paid great attention to marine environmental protection. In 1990 9, 20 days, the national oceanic administration of China issued the implementation of regulations on environmental protection and management for the exploration and development of marine petroleum. The fifteenth regulation of the method is that when the oil-based mud needs to be used, the low-toxicity oil-based mud is used; effective technical measures are adopted to fully separate the drill cuttings from the slurry; the oil-based mud must be recovered and must not be discharged into the sea; if the oil content of the drill cuttings exceeds 15% by weight, the discharge into the sea is prohibited. The cuttings with oil content less than 15 wt% are difficult to recover, approved by the sea area governing department, and can be discharged into the sea, but the cost of pollution discharge should be paid. Strict environmental protection laws and regulations and discharge standards of drilling fluid and wastes thereof restrict offshore drilling and drilling fluid companies, and bring huge economic pressure to offshore drilling and drilling fluid companies. Therefore, various technical measures are adopted by foreign drilling and drilling fluid companies to meet the requirements of environmental laws and regulations. According to statistics, in the 90 s of petroleum technology development, 80% of the American Petroleum Institute (API) exploration and development budgets are used on environmental protection-related projects.
The traditional methods for treating oil-based drilling waste include a rock debris reinjection method, an incineration method, an in-pit sealing method and the like. The method for reinjecting the rock debris has higher treatment cost, damages underground geological structures, pollutes oil layers or underground water, and is not suitable for treating the waste drill cuttings on a large scale; the burning of the drill cuttings can completely remove residual oil in the drill cuttings, but a large-scale treatment station needs to be established, the occupied area is large, the investment cost is high, the energy consumption is large, and burning products can generate strong toxic additives such as dioxin and the like; although the pit sealing method has low treatment cost, the pit sealing method occupies cultivated land and cannot permanently treat the pit without harm.
Accordingly, there is a need for the development of new oil-based drilling waste treatment methods.
Disclosure of Invention
The application provides a system and a method for recycling and harmlessly treating oil-based drilling waste, which can effectively separate oil, water and solid phases, the oil obtained by recycling can be used for repeatedly preparing oil-based mud, the oil content of the obtained solid waste is low, the energy consumption is low, the cost is low, and secondary pollution cannot be generated.
The application provides an oil base well drilling waste recycling and innocent treatment system includes:
a mixing device;
the thermal separator is respectively connected with the mixing device and the driving device, a moving part is arranged in the thermal separator, and the moving part can move under the driving of the driving device and generates heat through friction with the oil-based drilling waste entering the interior of the thermal separator during moving, so that oil and water in the oil-based drilling waste are heated and evaporated;
the dust removal device is connected with the thermal separator;
and the condensation tank is connected with the dust removal device.
In embodiments of the present application, the dust removing device may include any one or both of a cyclone dust collector and an oil washing wet dust collector. Optionally, the dust removing device comprises a cyclone dust collector and an oil washing wet dust collector, one end of the cyclone dust collector is connected with the hot separator, and the other end of the cyclone dust collector is connected with the oil washing wet dust collector.
In an embodiment of the present application, when the dust removing device includes a cyclone dust collector and an oil washing wet dust collector, a first end of the oil washing wet dust collector is connected with the cyclone dust collector, a second end of the oil washing wet dust collector is connected with one end of an oil washing circulating pump, and the other end of the oil washing circulating pump is connected with the first end of the oil washing wet dust collector, so that an oil washing circulating pipeline is formed between the first end and the second end of the oil washing wet dust collector;
the second end of the oil washing wet dust collector is filled with oil liquid; the first end of the oil washing wet dust collector is sequentially provided with an atomizer and a mixing layer from top to bottom.
In an embodiment of the present application, the condensing tank may include one condensing tank through which oil vapor and water vapor in the mixed vapor from the dust removing device are condensed.
In the embodiment of this application, the condensate tank can include oil condensate tank and water condensate tank, the oil condensate tank with dust collector connects, the oil condensate tank sets up to can be to coming from heavy oil in dust collector's the mist condenses, the water condensate tank with the oil condensate tank is connected, the water condensate tank sets up to can be to coming from light oil and vapor in the mist of oil condensate tank condense.
In the embodiment of this application, the first end of oil condensate tank with oil washing wet dust collector connects, the second end of oil condensate tank is connected with oil condensate circulating pump and oil condensate temperature controller's one end in proper order, the other end of oil condensate temperature controller with the first end of oil condensate tank is connected, makes form oil condensate circulating line between the first end of oil condensate tank and the second end.
Optionally, the first end of the oil condensate tank may be provided with an oil condensate atomizer; a first packing layer can be arranged below the oil condensation atomizer.
In the embodiment of this application, the first end of water condensation jar with the oil condensation jar is connected, the second end of water condensation jar is connected with the one end of water condensation circulating pump and water condensation temperature controller in proper order, the other end of water condensation temperature controller with the first end of water condensation jar is connected, makes form water condensation circulation pipeline between the first end of water condensation jar and the second end.
Optionally, the first end of the water condensation tank may be provided with a water condensation atomizer; and a second packing layer is arranged below the water condensation atomizer.
Optionally, the bottom of water condensing tank is provided with the liquid outlet, the liquid outlet is connected with oil gas water three-phase separator.
In an embodiment of the present application, the oil-based drilling waste recovery and detoxification treatment system may further include a non-condensable gas filter connected to the condensation tank.
In an embodiment of the present application, a filter element for filtering non-condensable gas may be disposed in the non-condensable gas filter.
In an embodiment of the present application, a filler filtration layer and/or a thermal oxidation filter may be further disposed in the non-condensable gas filter, and optionally, the filler filtration layer may be an activated carbon filtration layer.
In an embodiment of the present application, the oil-based drilling waste recovery and detoxification treatment system may further include a fan disposed after the non-condensable gas filter and connected to the non-condensable gas filter.
In an embodiment of the application, the thermal separator may be a hammer thermal separator, and includes a cylinder and an input shaft extending horizontally into the cylinder, the input shaft is provided with a moving part, the moving part is a rotor, and the oil-based drilling waste is accommodated in a sealed cavity of the cylinder and contacts with the rotor after entering the hammer thermal separator.
In an embodiment of the present application, the bottom of the thermal separator may be provided with a discharge opening, the discharge opening is connected with one end of a discharge valve, and the other end of the discharge valve is connected with a conveyor or a storage tank.
The application also provides an oil-based drilling waste recycling and harmless treatment method, which comprises the following steps: the oil-based drilling waste is in contact with the moving part in the sealed cavity, the driving device is used for driving the moving part to move, the moving part and the oil-based drilling waste generate heat through friction in the moving process, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, and the mixed steam is enabled to sequentially pass through the modes of dust removal, oil spraying condensation and water spraying condensation to realize oil-water-solid three-phase separation.
In an embodiment of the present application, the treatment method as described above is performed using the oil-based drilling waste recycling and innocent treatment system as described above, comprising:
(1) placing the oil-based drilling waste into the mixing device, uniformly mixing, and pumping into the thermal separator;
(2) the moving part inside the thermal separator moves under the driving of the driving device and generates heat through friction with the oil-based drilling waste entering the thermal separator during the movement, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, the mixed steam carries powdery solid phase to leave the thermal separator, and the solid phase remaining in the oil-based drilling waste is left at the bottom of the thermal separator;
(3) mixed steam from the thermal separator carries powdery solid phase into the dust removal device, the dust removal device captures the carried powdery solid phase and deposits the solid phase at the bottom of the dust removal device, and the mixed steam is separated out;
(4) and the mixed steam separated from the dust removal device enters the condensing tank, the condensing tank condenses condensable oil steam and water steam in the mixed steam, the condensed oil and water are left at the bottom of the condensing tank, and non-condensable gas in the mixed steam is separated.
In an embodiment of the present application, the step (2) may further include: the temperature in the hot separator is maintained in the range of 260 ℃ to 370 ℃ by adjusting the rotational speed of the driving means and controlling the feeding amount and the discharging amount of the hot separator.
In an embodiment of the present application, the step (2) may further include: and discharging the solid phase at the bottom of the hot separator to a conveyor or a storage tank through a discharge valve.
In an embodiment of the present application, the step (3) may include:
(3-1) the mixed steam from the hot separator carries powdery solid phase into a cyclone dust collector, a part of powdery solid phase is deposited at the bottom of the cyclone dust collector through cyclone separation, and the mixed steam carries the residual powdery solid phase to be separated; and
(3-2) follow the mixed steam that is smuggleing a small amount of likepowder solid phase secretly that cyclone separates gets into among the oil washing wet dust collector, oil liquid atomizing among them of oil washing wet dust collector, the contact of the mixed steam that is smuggleing likepowder solid phase with the oil droplet of atomizing and is catching likepowder solid phase, and the likepowder solid phase deposit that is caught is in oil washing wet dust collector bottom, mixed steam is separated.
In an embodiment of the present application, the step (3-1) may include: and discharging the solid phase at the bottom of the cyclone dust collector into a conveyor or a storage tank through a discharge valve.
In an embodiment of the present application, the step (3-2) may include: follow the mixed steam that is smuggleing liked powder solid phase that cyclone separates gets into among the oil washing wet dust collector, oil washing wet dust collector passes through oil washing circulating pump and sends the fluid pump of second end to first end, atomizes fluid through the atomizer afterwards, and the contact of layer department and mixing are mixed with the mixed steam that is liked powder solid phase to atomizing oil drops for powdered solid phase is caught, and the liked powder solid phase deposit that is caught is in oil washing wet dust collector bottom, mixed steam is separated out.
In the embodiment of the present application, the temperature of the oil in the step (3-2) may be 100 to 300 ℃.
In an embodiment of the present application, when the condensation tank includes one condensation tank, the step (4) may include: condensing oil vapor and water vapor in the mixed vapor from the dust removing device through the condensing tank; or
When the condensing tank includes an oil condensing tank and a water condensing tank, the step (4) may include:
(4-1) the mixed steam separated from the dust removing device enters the oil condensing tank, the oil condensing tank condenses heavy oil and part of light oil in the mixed steam, the condensed heavy oil and part of light oil are left at the bottom of the oil condensing tank, and water and residual light oil in the mixed steam are separated;
(4-2) the mixed gas of the water and the light oil separated from the oil condensation tank enters the water condensation tank, the water condensation tank condenses the mixed gas, the liquid obtained by condensation is left at the bottom of the water condensation tank, and the non-condensable gas is separated.
In an embodiment of the present application, the step (4-1) may include: the mixed steam separated from the oil washing wet dust collector enters the oil condensation tank and is condensed, the mixed liquid obtained by condensation is accumulated at the second end of the oil condensation tank, the mixed liquid is pumped to the oil condensation temperature controller for temperature control by the oil condensation circulating pump and then is pumped to the first end of the oil condensation tank, the mixed liquid is atomized by the oil condensation atomizer at the first end, heavy oil and part of light oil in atomized liquid drops are condensed in the oil condensation tank, the condensed heavy oil and part of light oil are left at the bottom of the oil condensation tank, and water and residual light oil in the mixed steam are separated.
In an embodiment of the present application, the step (4-1) may further include: and introducing the mixed steam separated from the oil washing wet dust collector into the lower part of a first packing layer of the oil condensing tank, and allowing the atomized liquid drops to enter the first packing layer to contact with the mixed steam, so that the mixed steam is condensed.
In an embodiment of the present application, the step (4-1) may further include: the temperature in the oil condensing tank is controlled to be above 100 ℃ by the oil condensing temperature controller.
In an embodiment of the present application, the step (4-1) may further include: and discharging the heavy oil and part of light oil at the bottom of the oil condensing tank to an oil storage tank.
In an embodiment of the present application, the step (4-2) may include: and the mixed gas of water and light oil separated from the oil condensing tank enters the water condensing tank and is condensed, the mixed liquid obtained by condensation is accumulated at the second end of the water condensing tank, the mixed liquid is pumped to a water condensing temperature controller for temperature control by a water condensing circulating pump and then is pumped to the first end of the water condensing tank, the mixed liquid is atomized by a water condensing atomizer at the first end, the light oil and water vapor in the atomized liquid drops are condensed in the water condensing tank, the liquid obtained by condensation is left at the bottom of the water condensing tank, and the non-condensable gas is separated.
In an embodiment of the present application, the step (4-2) may further include: and introducing the mixed gas of water and light oil separated from the oil condensing tank into the lower part of a second packing layer of the water condensing tank, and allowing the atomized liquid drops to enter the second packing layer to contact with the mixed gas so as to condense the mixed gas.
In an embodiment of the present application, the step (4-2) may further include: controlling the temperature in the water condensation tank to 20 ℃ to 80 ℃ by the water condensation temperature controller.
In an embodiment of the present application, the step (4-2) may further include: and discharging the liquid at the bottom of the water condensation tank into an oil-gas-water three-phase separator.
In an embodiment of the present application, the processing method, after step (4), may further include: (5) and the non-condensable gas separated from the water condensation tank enters the non-condensable gas filter, and the non-condensable gas filter filters water and light oil which are mixed with the non-condensable gas.
In an embodiment of the present application, the step (5) may include: and primarily filtering the non-condensable gas separated from the water condensation tank by using a filter element, and optionally performing supplementary filtration on the non-condensable gas by using a filler filtering layer and/or a thermal oxidation filter, so that water and light oil which are mixed in the non-condensable gas are filtered.
In an embodiment of the present application, the step (5) may further include: and pumping out the non-condensable gas in the non-condensable gas filter by adopting a fan.
In an embodiment of the present application, the solid phase in the oil-based drilling waste may be 10% to 80% by mass.
This application utilizes the principle of the heat of friction to handle oil base drilling discarded object belongs to low temperature thermal desorption technique, can effectively solve the problem that produces secondary pollution in the processing procedure, has not only filled china's short slab on this technical field, can solve the environmental protection problem of platform moreover, has promoted the competitiveness of the oil field drilling technique in international market in china.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a schematic diagram of a processing system according to an embodiment of the present application;
FIG. 2 is a front and left sectional view of a thermal separator of a treatment system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an oil scrubber wet scrubber of the treatment system of an embodiment of the present application;
FIG. 4 is a schematic diagram of the oil condensate tank of the treatment system of an embodiment of the present application;
FIG. 5 is a schematic diagram of a water condensate tank of the treatment system of an embodiment of the present application;
fig. 6 is a schematic structural diagram of a non-condensable gas filter according to an embodiment of the present invention.
The reference numerals in the drawings have the following meanings:
1-a mixing device; 2-a feed pump; 4-a drive device; 3-a thermal separator; 302-a rotor; 301-a barrel; 303-material layer; 5-a first discharge valve; 8-a second discharge valve; 6-a conveyor; 7-a cyclone dust collector; 10-oil wash circulation pump; 9-oil washing wet dust collector; 901-a first atomizer; 902-mixed layer; 11-oil condensate tank; 1101-an oil condensation atomizer; 1102 — a first packing layer; 13-oil condensation temperature controller; 12-oil condensation circulation pump; 14-water condensation tank; 1401-a water condensation atomizer; 1402-second packing layer; 16-water condensation temperature controller; 15-water condensation circulation pump; 17-a non-condensable gas filter; 1701-non-condensable gas inlet; 1702-noncondensable gas vent; 1703-drain port; 1704-filter element; 18-a fan; 19-oil-gas-water three-phase separator; 20-an oil storage tank; a-air inlet, B-air outlet and C-liquid outlet.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides an oil-based drilling waste recycling and harmless treatment system, as shown in fig. 1, the treatment system comprises: mixing device 1, thermal separator 3, dust collector and condensing tank.
The mixing device 1 is arranged to be able to mix the oil-based drilling waste placed therein homogeneously, and the outlet end of the mixing device 1 is provided with a feed pump 2 for pumping the homogeneously mixed oil-based drilling waste.
The thermal separator 3 is respectively connected with the feeding pump 2 and the driving device 4, and a moving part is arranged inside the thermal separator 3, is driven by the driving device 4 to move, and generates heat through friction with the oil-based drilling waste entering the interior of the thermal separator 3 during the movement, so that oil and water in the oil-based drilling waste are heated and evaporated.
The dust removing device is connected with the hot separator 3 and is arranged to capture and deposit powdery solid phase carried by mixed steam of oil and water from the hot separator 3 at the bottom of the dust removing device.
The condensing tank is connected with the dust removal device and is arranged to condense oil vapor and water vapor in the mixed steam from the dust removal device.
In the embodiment of the present application, the driving device 4 may be an engine or a motor.
In an embodiment of the present application, as shown in fig. 2, the thermal separator 3 may be a hammer type thermal separator, which includes a cylinder 301 and an input shaft horizontally extending into the cylinder, the input shaft is provided with a moving component, which may be a rotor 302 (e.g., a rotating arm), and after entering the thermal separator 3, a material layer 303 of oil-based drilling waste is contained in a sealed cavity of the cylinder 301 and contacts with the rotor 302.
In one embodiment of the present application, the thermal separator 3 may employ an oil-containing solid waste three-phase separation device disclosed in chinese patent application No. 201611248867.4.
In the embodiment of the present application, the bottom of the thermal separator 3 may be provided with a discharge port, the discharge port is connected with one end of a first discharge valve 5, and the other end of the first discharge valve 5 is connected with a conveyor 6 or a storage tank.
In the embodiment of the present application, the dust removing device may include any one or two of the cyclone 7 and the oil washing wet dust collector 9, and may be selected according to actual dust removing needs. The oil scrubber 9 is configured to atomize the oil therein and capture the solid powder by contacting atomized oil droplets with the mixed steam carrying the solid powder entering the oil scrubber 9.
In the embodiment of the application, a heat preservation prevention steam condensation heat insulation bag can be arranged on the outer wall of the cyclone dust collector 7, and the heat preservation prevention steam condensation heat insulation bag can be made of fireproof heat insulation cotton materials; the inner wall of the cyclone dust collector 7 can be provided with a high-temperature resistance-reducing spraying layer, and the high-temperature resistance-reducing spraying layer can be made of tungsten carbide coating materials.
In the embodiment of the present application, the bottom of the cyclone 7 may be provided with a discharge opening, the discharge opening is connected with one end of a second discharge valve 8, and the other end of the second discharge valve 8 is connected with the conveyor 6 or the storage tank. Optionally, the conveyor 6 may be a screw conveyor.
In one embodiment of the application, the first discharge valve 5 of the hot separator 3 and the second discharge valve 8 of the cyclone 7 can be connected to the same conveyor 6 or to the same storage tank. The conveyor 6 may be provided with two material inlets for connection with the first discharge valve 5 and the second discharge valve 8, respectively.
In one embodiment of the present application, the dust removing means comprises a cyclone 7 and an oil washing wet dust collector 9, one end of the cyclone 7 is connected with the hot separator 3; the other end is connected to the oil scrubbing wet scrubber 9.
In a specific embodiment of the present application, the first end of oil washing wet dust collector 9 with cyclone 7 connects, the second end of oil washing wet dust collector 9 is connected with the one end of oil washing circulating pump 10, the other end of oil washing circulating pump 10 with the first end of oil washing wet dust collector 9 is connected, makes it form oil washing circulation pipeline between the first end of oil washing wet dust collector 9 and the second end. The second end of the oil washing wet dust collector 9 is filled with oil liquid; as shown in fig. 3, a first atomizer 901 and a mixing layer 902 are sequentially arranged at a first end of the oil scrubber wet scrubber 9 from top to bottom, the oil scrubber wet scrubber 9 is configured to be able to pump oil at a second end to the first end through the oil scrubber circulation pump 10, then the oil is atomized by the first atomizer 901, and atomized oil droplets are contacted and mixed with oil-water mixed steam containing powdery solid phase entering the oil scrubber wet scrubber 9 at the mixing layer 902, so that the solid phase in the oil-water mixed steam is captured by the atomized oil droplets. The mixing layer may be formed by a spiral baffle, so that the gas entering the inner wall of the oil washing wet dust collector is disturbed, and thus, the oil droplets atomized by the first atomizer 901 are more sufficiently mixed with the gas.
In the embodiment of the present application, the oil washing wet dust collector 9 may adopt a high temperature oil gas dust collector disclosed in chinese patent application No. CN 201920447032.4.
In the embodiment of the present application, the condensation tank may be a primary condensation or a secondary condensation.
In the case of the first-stage condensation, the condensation tank includes only one condensation tank through which oil vapor and water vapor in the mixed vapor from the dust removing device are condensed.
When the secondary condensation is performed, the condensation tank may include an oil condensation tank 11 and a water condensation tank 14. The oil condensing tank 11 is connected with the dust removing device, and the oil condensing tank 11 is arranged to condense heavy oil and part of light oil in the mixed steam from the dust removing device. The water condensation tank 14 is connected to the oil condensation tank 11, and the water condensation tank 14 is configured to be able to condense light oil vapor and water vapor in the mixed gas from the oil condensation tank 11.
In a specific embodiment of this application, the first end of oil condensate tank 11 with oil washes wet dust collector 9 and connects, the second end of oil condensate tank 11 is connected with the one end of oil condensate circulating pump 12 and oil condensate temperature controller 13 in proper order, the other end of oil condensate temperature controller 13 with the first end of oil condensate tank 11 is connected, makes form oil condensate circulation pipeline between the first end of oil condensate tank 11 and the second end. As shown in fig. 4, an oil condensing atomizer 1101 is disposed at a first end of the oil condensing tank 11, the oil condensing tank 11 is configured to pump a mixed liquid, which is obtained by condensing the mixed steam from the oil scrubber 9 at a second end by the oil condensing circulation pump 12, to the first end via the oil condensing temperature controller 13, control the temperature of the mixed liquid by the oil condensing temperature controller 13, atomize the mixed liquid by the oil condensing atomizer 1101, and condense heavy oil and a part of light oil in the atomized liquid droplets.
In an embodiment of the present application, a first filler layer 1102 may be disposed below the oil condensation atomizer 1101. The packing in the first packing layer 1102 may be pall rings, raschig rings, etc.
In the embodiment of this application, the bottom of oil condensate tank 11 can be provided with the liquid outlet, the liquid outlet is connected with oil storage tank 20, the more liquid in oil condensate tank 11 can be accumulated, can with these liquid discharge to in the oil storage tank 20.
In a specific embodiment of this application, the first end of water condensate tank 14 with oil condensate tank 11 is connected, the second end of water condensate tank 14 is connected with the one end of water condensation circulating pump 15 and water condensation temperature controller 16 in proper order, the other end of water condensation temperature controller 16 with the first end of water condensate tank 14 is connected, makes form water condensation circulation pipeline between the first end of water condensate tank 14 and the second end. As shown in fig. 5, a first end of the water condensation tank 14 is provided with a water condensation atomizer 1401, the water condensation tank 14 is configured to be capable of pumping a mixed liquid, which is obtained by condensing the mixed gas from the oil condensation tank 11 at a second end by the water condensation circulation pump 15, to the first end via the water condensation temperature controller 16, performing temperature control on the mixed liquid by the water condensation temperature controller 16 and atomizing the mixed liquid by the water condensation atomizer 1401, and condensing the light oil and the water vapor in the atomized liquid droplets;
in the embodiments of the present application, a second packing layer 1402 may be disposed below the water condensation atomizer 1401. The packing in second packing layer 1402 can be pall rings, raschig rings, or the like.
In the embodiment of this application, the bottom of water condensing tank 14 can be provided with the liquid outlet, the liquid outlet is connected with oil gas water three-phase separator 19. The more the liquid in the water condensation tank 14 is accumulated, the light oil and water contained in the liquid can be discharged to the oil-gas-water three-phase separator 19, so that the oil and water are kept still inside and naturally layered under the action of gravity. The oil-gas-water three-phase separator 19 may be a horizontal three-phase separator.
In the embodiment of the present application, the oil condensation tank 11 and the water condensation tank 14 may employ a small packed tower and a spray tower with an atomizer commonly used in the art, for example, commercially available from Wuxi Peng Miao chemical Equipment Co.
In the embodiment of the present application, the treatment system may further include a non-condensable gas filter 17, the non-condensable gas filter 17 is connected to the condensing tank, and the non-condensable gas filter 17 is configured to be able to filter out water, light oil and flocculent impurities included in the non-condensable gas entering the non-condensable gas filter.
In an embodiment of the present application, as shown in fig. 6, the non-condensable gas filter 17 may include: the non-condensable gas from the water condensation tank 14 enters from the non-condensable gas inlet 1701, is filtered by the filter element 1704 and then is discharged from the non-condensable gas outlet 1702, and a small amount of mist carried in the non-condensable gas is gathered at the bottom and flows out from the liquid outlet 1703. Wherein, filter core 1704 can be wet-type oil-gas separation filter screen, for example can adopt the wire net filter core. The filter element 1704 fills the inner space of the non-condensable gas filter 17, thereby performing a function of filtering liquid water, oil and flocculent impurities entrained in the gas.
For the occasions with higher requirements on removing the non-condensable gas, a filler filtering layer and/or a thermal oxidation filter can be arranged in the non-condensable gas filter 17 and used for performing supplementary filtration on water and light oil mixed in the non-condensable gas. The filler filter layer may be an activated carbon filter layer.
In the embodiment of the present application, the processing system may further include a blower 18, and the blower 18 is disposed after the non-condensable gas filter 17 and connected to the non-condensable gas filter 17, and is used for pumping the gas separated by the non-condensable gas filter 17 out of the system.
The embodiment of the application also provides an oil-based drilling waste recycling and harmless treatment method, which comprises the following steps: the oil-based drilling waste is in contact with the moving part in the sealed cavity, the driving device is used for driving the moving part to move, the moving part and the oil-based drilling waste generate heat through friction in the moving process, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, and the mixed steam is enabled to sequentially pass through the modes of dust removal, oil spraying condensation and water spraying condensation to realize oil-water-solid three-phase separation.
In an embodiment of the present application, the processing method may be performed by using the processing system as described above, including:
(1) placing the oil-based drilling waste into the mixing device 1, uniformly mixing, and pumping into the thermal separator 3 through the feeding pump 2;
(2) the moving part inside the thermal separator 3 moves under the driving of the driving device 4 and generates heat by friction with the oil-based drilling waste entering the thermal separator 3 during the movement, the oil and the water in the oil-based drilling waste are heated and evaporated into mixed steam, the mixed steam carries powdery solid phase away from the thermal separator 3, and the solid phase remained in the oil-based drilling waste is left at the bottom of the thermal separator 3;
(3) the mixed steam from the thermal separator 3 carries powdery solid phase into the dust removal device, the dust removal device captures the carried powdery solid phase and deposits the solid phase at the bottom of the dust removal device, and the mixed steam is separated out;
(4) and the mixed steam separated from the dust removal device enters the condensing tank, the condensing tank condenses condensable oil steam and water steam in the mixed steam, the condensed oil and water are left at the bottom of the condensing tank, and non-condensable gas in the mixed steam is separated.
In an embodiment of the present application, the step (2) may further include: maintaining the temperature in the hot separator 3 in the range of 260 ℃ to 370 ℃ by adjusting the rotational speed of the driving means 4 and controlling the feeding amount and the discharging amount of the hot separator 3;
optionally, the step (2) further comprises: the solid phase at the bottom of the hot separator 3 is discharged through a first discharge valve 5 into a conveyor or holding tank.
In an embodiment of the present application, the step (3) may include:
(3-1) the mixed steam from the hot separator 3 carries powdery solid phase into a cyclone dust collector 7, most of the powdery solid phase is deposited at the bottom of the cyclone dust collector 7 through cyclone separation, and the mixed steam carries a small amount of the powdery solid phase to be separated; and
(3-2) follow the mixed steam that has carried a small amount of likepowder solid phase secretly that cyclone 7 separates gets into in the oil washes wet scrubber 9, oil wash wet scrubber 9 atomizes the fluid wherein, and atomizing oil drops and the mixed steam contact that has carried a small amount of likepowder solid phase secretly catches a small amount of likepowder solid phase, and the likepowder solid phase deposit that is caught is in oil wash wet scrubber 9 bottom, mixed steam is separated out.
In an embodiment of the present application, the step (3-2) may include: the mixed steam separated from the cyclone dust collector 7 and carrying a small amount of powdery solid phase enters the oil washing wet dust collector 9, the oil washing wet dust collector 9 pumps the oil at the second end to the first end through an oil washing circulating pump 10, then the oil is atomized through a first atomizer 901, atomized oil drops are contacted and mixed with the mixed steam carrying a small amount of powdery solid phase at a mixed layer 902, so that a small amount of powdery solid phase is captured, the captured small amount of powdery solid phase is deposited at the bottom of the oil washing wet dust collector 9, and the mixed steam is separated;
optionally, the temperature of the oil is 100 ℃ to 300 ℃;
optionally, the step (3-1) may further include: and discharging the solid phase at the bottom of the cyclone dust collector 7 to a conveyor or a storage tank through a second discharge valve 8.
In the embodiment of the present application, the step (4) may adopt a primary condensation or a secondary condensation.
When the primary condensation mode is adopted, the condensation tank only comprises one condensation tank, and the step (4) may include: and condensing the oil vapor and the water vapor in the mixed vapor from the dust removing device through the condensing tank.
When the secondary condensation mode is adopted, the step (4) may comprise:
(4-1) the mixed steam separated from the dust removing device enters the oil condensing tank 11, the oil condensing tank 11 condenses heavy oil and part of light oil in the mixed steam, the condensed heavy oil and part of light oil are left at the bottom of the oil condensing tank 11, and water and residual light oil in the mixed steam are separated;
(4-2) the mixed gas of the water and the light oil separated from the oil condensation tank 11 enters the water condensation tank 14, the water condensation tank 14 condenses the mixed gas, the liquid obtained by condensation is left at the bottom of the water condensation tank 14, and the non-condensable gas is separated.
In a specific embodiment of the present application, the step (4-1) may include: mixed steam separated from the oil washing wet dust collector 9 enters the oil condensing tank 11 and is condensed, mixed liquid obtained by condensation is accumulated at the second end of the oil condensing tank 11, an oil condensing circulating pump 12 pumps the mixed liquid to an oil condensing temperature controller 13 for temperature control, and then the mixed liquid is pumped to the first end of the oil condensing tank 11, an oil condensing atomizer 1101 at the first end atomizes the mixed liquid, heavy oil and part of light oil in atomized liquid drops are condensed in the oil condensing tank 11, the condensed heavy oil and part of light oil are left at the bottom of the oil condensing tank 11, and water and residual light oil in the mixed steam are separated;
optionally, the step (4-1) may further include: introducing mixed steam separated from the oil washing wet dust collector 9 into the lower part of a first packing layer 1102 of the oil condensation tank 11, and allowing atomized liquid drops to enter the first packing layer 1102 to contact with the mixed steam, so that the mixed steam is condensed;
optionally, the step (4-1) may further include: the temperature in the oil condensation tank 11 is controlled to be above 100 ℃ by the oil condensation temperature controller 13;
optionally, the step (4-1) may further include: the heavy oil and a part of the light oil at the bottom of the oil condensate tank 11 are discharged to an oil storage tank 20.
In a specific embodiment of the present application, the step (4-2) may include: the mixed gas of water and light oil separated from the oil condensation tank 11 enters the water condensation tank 14 and is condensed, the mixed liquid obtained by condensation is accumulated at the second end of the water condensation tank 14, the mixed liquid is pumped to a water condensation temperature controller 16 by a water condensation circulating pump 15 for temperature control and then is pumped to the first end of the water condensation tank 14, a water condensation atomizer 1401 at the first end atomizes the mixed liquid, the light oil and water vapor in the atomized liquid drops are condensed in the water condensation tank 14, the liquid obtained by condensation is left at the bottom of the water condensation tank 14, and the non-condensable gas is separated;
optionally, the step (4-2) may further include: the mixed gas of water and light oil separated from the oil condensation tank 11 is introduced into the lower part of the second packing layer 1402 of the water condensation tank 14, and the atomized liquid drops enter the second packing layer 1402 to contact with the mixed gas, so that the mixed gas is condensed;
optionally, the step (4-2) may further include: controlling the temperature within the water condensation tank 14 at 20 ℃ to 80 ℃ by the water condensation temperature controller 16;
optionally, the step (4-2) may further include: the liquid at the bottom of the water condensation tank 14 is discharged to an oil-gas-water three-phase separator 19.
In an embodiment of the present application, after the step (4), the processing method may further include: (5) the non-condensable gas separated from the water condensation tank 14 enters the non-condensable gas filter 17, and the non-condensable gas filter 17 filters water and light oil which are mixed with the non-condensable gas.
In an embodiment of the present application, the step (5) may include: primarily filtering the non-condensable gas separated from the water condensation tank 14 through a filter element 1704, and optionally performing supplementary filtration on the non-condensable gas through a filler filter layer and/or a thermal oxidation filter, so that water and light oil which are included in the non-condensable gas are filtered;
optionally, the step (5) may further include: and a fan is adopted to pump out harmless non-condensable gas in the non-condensable gas filter 17.
In a specific embodiment of the present application, the processing method may include:
(1) placing the oil-based drilling waste into the mixing device 1, uniformly mixing, and pumping into the thermal separator 3 through the feeding pump 2;
(2) the moving part inside the thermal separator 3 moves under the driving of the driving device 4 and generates heat through friction with the oil-based drilling waste entering the thermal separator 3 during the movement, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, the mixed steam carries powdery solid phase out of the thermal separator 3, and the rest solid phase in the oil-based drilling waste is deposited at the bottom of the thermal separator 3 and then is discharged into a conveyor or a storage tank through a first discharge valve 5; the temperature in the hot separator 3 is always maintained in the range of 260 ℃ to 370 ℃, which can be realized by adjusting the rotating speed of the driving device 4 and controlling the feeding amount and the discharging amount of the hot separator 3;
(3-1) the mixed steam from the hot separator 3 carries powdery solid phase into a cyclone dust collector 7, most of the powdery solid phase is deposited at the bottom of the cyclone dust collector 7 through cyclone separation, the mixed steam carries a small amount of the powdery solid phase to be separated, and the solid phase at the bottom of the cyclone dust collector 7 is discharged into a conveyor or a storage tank through a second discharge valve 8;
(3-2) the mixed steam which is separated from the cyclone dust collector 7 and carries a small amount of powdery solid phase enters the oil washing wet dust collector 9, the second end of the oil washing wet dust collector 9 contains high-temperature oil liquid with the temperature of about 100 ℃ to 300 ℃, the oil washing wet dust collector 9 pumps the oil liquid to the first end through an oil washing circulating pump 10, then the oil liquid is atomized through a first atomizer 901, atomized oil drops are contacted and mixed with the mixed steam which carries a small amount of powdery solid phase at a mixed layer 902, so that a small amount of powdery solid phase is captured, the captured small amount of powdery solid phase is deposited at the bottom of the oil washing wet dust collector 9, and the mixed steam is separated;
(4-1) the mixed steam separated from the oil washing wet dust collector 9 enters the oil condensing tank 11 and is condensed, the mixed liquid obtained by condensation is accumulated at the second end of the oil condensing tank 11, the mixed liquid is pumped to an oil condensing temperature controller 13 by an oil condensing circulating pump 12 for temperature control, so that the temperature in the oil condensing tank 11 is controlled to be more than 100 ℃, then the mixed liquid is pumped to the first end of the oil condensing tank 11, the oil condensing atomizer 1101 at the first end atomizes the mixed liquid, the atomized liquid drops fully contact with the mixed steam separated from the oil washing wet dust collector 9 in the first packing layer 1102, the heavy oil and part of the light oil in the atomized liquid drops are condensed, the condensed heavy oil and part of the light oil are left at the bottom of the oil condensing tank 11, then discharged to an oil storage tank 20, and water and remaining light oil in the mixed steam are separated;
(4-2) the mixed gas of water and light oil separated from the oil condensing tank 11 enters the water condensing tank 14 and is condensed, the mixed liquid obtained by condensation is accumulated at the second end of the water condensing tank 14, the mixed liquid is pumped to a water condensing temperature controller 16 by a water condensing circulating pump 15 for temperature control, so that the temperature in the water condensing tank 14 is controlled between 20 ℃ and 80 ℃, then the mixed liquid is pumped to the first end of the water condensation tank 14, the water condensation atomizer 1401 at the first end atomizes the mixed liquid, the atomized liquid drops are fully contacted with the mixed gas of water and light oil separated from the oil condensation tank 11 in the second packing layer 1402, condensing light oil and water vapor, reserving the liquid obtained by condensation at the bottom of the water condensation tank 14, then discharging the liquid into an oil-gas-water three-phase separator 19, and separating out non-condensable gas;
(5) the non-condensable gas separated from the water condensation tank 14 enters the non-condensable gas filter 17, the non-condensable gas separated from the water condensation tank 14 is subjected to primary filtration through the filter element 1704, and the non-condensable gas is subjected to supplementary filtration through the filler filter layer and/or the thermal oxidation filter, so that water and light oil mixed with the non-condensable gas are filtered, and the non-condensable gas is pumped out by a fan.
In an embodiment of the present application, the solid phase in the oil-based drilling waste may be 10% to 80% by mass.
TABLE 1
It can be seen that when the hammer type heat separator is adopted by the oil-based drilling waste recycling and harmless treatment system in the embodiment of the application to heat and evaporate the oil and the water in the oil-based drilling waste, the oil content in the dry slag after heat treatment is low, the energy consumption of the heat treatment is low, and the tail gas discharged by the system meets the national emission standard. However, if the dust removal device or the condensation device in the system of the embodiment of the present application is removed, the solid content in the recovered oil is significantly increased or valuable recovered oil and microspheres cannot be obtained, and the emission standard can be met only by special treatment.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (19)
1. An oil-based drilling waste recovery and innocent treatment system, comprising:
a mixing device;
the thermal separator is respectively connected with the mixing device and the driving device, a moving part is arranged in the thermal separator, and the moving part can move under the driving of the driving device and generates heat through friction with the oil-based drilling waste entering the interior of the thermal separator during moving, so that oil and water in the oil-based drilling waste are heated and evaporated;
the dust removal device is connected with the thermal separator;
and the condensation tank is connected with the dust removal device.
2. The treatment system of claim 1, wherein the dust removal device comprises either or both of a cyclone and an oil scrubber wet;
optionally, the dust removing device comprises a cyclone dust collector and an oil washing wet dust collector, one end of the cyclone dust collector is connected with the hot separator, and the other end of the cyclone dust collector is connected with the oil washing wet dust collector.
3. The treatment system of claim 2, wherein when the dust removal device comprises a cyclone and an oil wash wet scrubber, a first end of the oil wash wet scrubber is connected with the cyclone, a second end of the oil wash wet scrubber is connected with one end of an oil wash circulation pump, and the other end of the oil wash circulation pump is connected with the first end of the oil wash wet scrubber such that an oil wash circulation line is formed between the first and second ends of the oil wash wet scrubber;
the second end of the oil washing wet dust collector is filled with oil liquid; the first end of the oil washing wet dust collector is sequentially provided with an atomizer and a mixing layer from top to bottom.
4. The processing system according to claim 1 or 2, wherein the condensation tank includes one condensation tank by which oil vapor and water vapor in the mixed vapor from the dust removing device are condensed.
5. The processing system according to claim 1 or 2, wherein the condensing tank comprises an oil condensing tank and a water condensing tank, the oil condensing tank is connected with the dust removing device, the oil condensing tank is configured to condense heavy oil in mixed steam from the dust removing device, the water condensing tank is connected with the oil condensing tank, and the water condensing tank is configured to condense light oil and water vapor in mixed gas from the oil condensing tank.
6. The treatment system according to claim 5, wherein when the dust removing device comprises a cyclone dust collector and an oil washing wet dust collector, a first end of the oil condensing tank is connected with the oil washing wet dust collector, a second end of the oil condensing tank is sequentially connected with an oil condensing circulating pump and one end of an oil condensing temperature controller, and the other end of the oil condensing temperature controller is connected with the first end of the oil condensing tank, so that an oil condensing circulating line is formed between the first end and the second end of the oil condensing tank;
an oil condensation atomizer is arranged at the first end of the oil condensation tank;
optionally, a first packing layer is disposed below the oil condensing atomizer.
7. The processing system of claim 5, wherein a first end of the water condensation tank is connected with the oil condensation tank, a second end of the water condensation tank is sequentially connected with a water condensation circulation pump and one end of a water condensation temperature controller, and the other end of the water condensation temperature controller is connected with the first end of the water condensation tank, so that a water condensation circulation line is formed between the first end and the second end of the water condensation tank;
a water condensation atomizer is arranged at the first end of the water condensation tank;
optionally, a second packing layer is arranged below the water condensation atomizer;
optionally, the bottom of water condensing tank is provided with the liquid outlet, the liquid outlet is connected with oil gas water three-phase separator.
8. The treatment system according to claim 1 or 2, further comprising a non-condensable gas filter, said non-condensable gas filter being connected to said condensation tank;
optionally, a filter element for filtering the non-condensable gas is arranged in the non-condensable gas filter;
optionally, a filler filtering layer and/or a thermal oxidation filter are/is further arranged in the non-condensable gas filter, and optionally, the filler filtering layer is an activated carbon filtering layer;
optionally, the treatment system further comprises a fan disposed after and connected to the non-condensable gas filter.
9. The treatment system of claim 1 or 2, wherein the thermal separator is a hammer thermal separator comprising a barrel and an input shaft extending horizontally into the barrel, the input shaft having a moving member disposed thereon, the moving member being a rotor, the oil-based drilling waste being received in a sealed cavity of the barrel and contacting the rotor after entering the hammer thermal separator;
optionally, the bottom of the thermal separator is provided with a discharge port, the discharge port is connected with one end of a discharge valve, and the other end of the discharge valve is connected with a conveyor or a storage tank.
10. A method for recycling and harmlessly treating oil-based drilling waste comprises the following steps: the oil-based drilling waste is in contact with the moving part in the sealed cavity, the driving device is used for driving the moving part to move, the moving part and the oil-based drilling waste generate heat through friction in the moving process, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, and the mixed steam is enabled to sequentially pass through the modes of dust removal, oil spraying condensation and water spraying condensation to realize oil-water-solid three-phase separation.
11. The processing method according to claim 10, carried out with a processing system according to any one of claims 1-9, comprising:
(1) placing the oil-based drilling waste into the mixing device, uniformly mixing, and pumping into the thermal separator;
(2) the moving part inside the thermal separator moves under the driving of the driving device and generates heat through friction with the oil-based drilling waste entering the thermal separator during the movement, oil and water in the oil-based drilling waste are heated and evaporated into mixed steam, the mixed steam carries powdery solid phase to leave the thermal separator, and the solid phase remaining in the oil-based drilling waste is left at the bottom of the thermal separator;
(3) mixed steam from the thermal separator carries powdery solid phase into the dust removal device, the dust removal device captures the carried powdery solid phase and deposits the solid phase at the bottom of the dust removal device, and the mixed steam is separated out;
(4) and the mixed steam separated from the dust removal device enters the condensing tank, the condensing tank condenses condensable oil steam and water steam in the mixed steam, the condensed oil and water are left at the bottom of the condensing tank, and non-condensable gas in the mixed steam is separated.
12. The process of claim 11, wherein the step (2) further comprises: maintaining the temperature in the hot separator in the range of 260 ℃ to 370 ℃ by adjusting the rotational speed of the driving means and controlling the feeding amount and the discharging amount of the hot separator;
optionally, the step (2) further comprises: and discharging the solid phase at the bottom of the hot separator to a conveyor or a storage tank through a discharge valve.
13. The processing method according to claim 11, wherein the step (3) includes:
(3-1) the mixed steam from the hot separator carries powdery solid phase into a cyclone dust collector, a part of powdery solid phase is deposited at the bottom of the cyclone dust collector through cyclone separation, and the mixed steam carries the residual powdery solid phase to be separated; and
(3-2) follow the mixed steam that is smuggleing a small amount of likepowder solid phase secretly that cyclone separates gets into among the oil washing wet dust collector, oil liquid atomizing among them of oil washing wet dust collector, the contact of the mixed steam that is smuggleing likepowder solid phase with the oil droplet of atomizing and is catching likepowder solid phase, and the likepowder solid phase deposit that is caught is in oil washing wet dust collector bottom, mixed steam is separated.
14. The processing method as set forth in claim 13, wherein the step (3-2) includes: mixed steam which is separated from the cyclone dust collector and carries a powdery solid phase enters the oil washing wet dust collector, the oil washing wet dust collector pumps oil at a second end to a first end through an oil washing circulating pump, then the oil is atomized through the atomizer, atomized oil drops are contacted and mixed with the mixed steam which carries the powdery solid phase at a mixed layer, so that the powdery solid phase is captured, the captured powdery solid phase is deposited at the bottom of the oil washing wet dust collector, and the mixed steam is separated;
optionally, the temperature of the oil liquid in the step (3-2) is 100 ℃ to 300 ℃;
optionally, the step (3-1) further comprises: and discharging the solid phase at the bottom of the cyclone dust collector into a conveyor or a storage tank through a discharge valve.
15. The process of claim 11, wherein when the condensate tank comprises a condensate tank, the step (4) comprises: condensing oil vapor and water vapor in the mixed vapor from the dust removing device through the condensing tank; or
When the condensing tank includes an oil condensing tank and a water condensing tank, the step (4) includes:
(4-1) the mixed steam separated from the dust removing device enters the oil condensing tank, the oil condensing tank condenses heavy oil and part of light oil in the mixed steam, the condensed heavy oil and part of light oil are left at the bottom of the oil condensing tank, and water and residual light oil in the mixed steam are separated;
(4-2) the mixed gas of the water and the light oil separated from the oil condensation tank enters the water condensation tank, the water condensation tank condenses the mixed gas, the liquid obtained by condensation is left at the bottom of the water condensation tank, and the non-condensable gas is separated.
16. The processing method as set forth in claim 15, wherein the step (4-1) includes: mixed steam separated from the oil washing wet dust collector enters the oil condensation tank and is condensed, mixed liquid obtained by condensation is accumulated at the second end of the oil condensation tank, an oil condensation circulating pump pumps the mixed liquid to an oil condensation temperature controller for temperature control, and then the mixed liquid is pumped to the first end of the oil condensation tank, the oil condensation atomizer at the first end atomizes the mixed liquid, heavy oil and part of light oil in atomized liquid drops are condensed in the oil condensation tank, the condensed heavy oil and part of light oil are left at the bottom of the oil condensation tank, and water and residual light oil in the mixed steam are separated;
optionally, the step (4-1) further comprises: introducing mixed steam separated from the oil washing wet dust collector into the lower part of a first packing layer of the oil condensing tank, and allowing atomized liquid drops to enter the first packing layer to contact with the mixed steam, so that the mixed steam is condensed;
optionally, the step (4-1) further comprises: controlling the temperature in the oil condensing tank to be above 100 ℃ by the oil condensing temperature controller;
optionally, the step (4-1) further comprises: and discharging the heavy oil and part of light oil at the bottom of the oil condensing tank to an oil storage tank.
17. The processing method as set forth in claim 15, wherein the step (4-2) includes: mixed gas of water and light oil separated from the oil condensing tank enters the water condensing tank and is condensed, mixed liquid obtained by condensation is accumulated at the second end of the water condensing tank, a water condensing circulating pump pumps the mixed liquid to a water condensing temperature controller for temperature control, and then the mixed liquid is pumped to the first end of the water condensing tank, a water condensing atomizer at the first end atomizes the mixed liquid, the light oil and water vapor in the atomized liquid drops are condensed in the water condensing tank, liquid obtained by condensation is left at the bottom of the water condensing tank, and non-condensable gas is separated;
optionally, the step (4-2) further comprises: introducing mixed gas of water and light oil separated from the oil condensing tank into the lower part of a second packing layer of the water condensing tank, and allowing atomized liquid drops to enter the second packing layer to contact with the mixed gas so as to condense the mixed gas;
optionally, the step (4-2) further comprises: controlling the temperature in the water condensation tank at 20 ℃ to 80 ℃ by the water condensation temperature controller;
optionally, the step (4-2) further comprises: and discharging the liquid at the bottom of the water condensation tank into an oil-gas-water three-phase separator.
18. The processing method according to any one of claims 11 to 17, further comprising, after step (4): (5) the non-condensable gas separated from the water condensation tank enters the non-condensable gas filter, and the non-condensable gas filter filters water and light oil which are mixed with the non-condensable gas;
optionally, the step (5) comprises: primarily filtering the non-condensable gas separated from the water condensation tank through a filter element, and optionally performing supplementary filtration on the non-condensable gas through a filler filter layer and/or a thermal oxidation filter to filter water and light oil which are mixed in the non-condensable gas;
optionally, the step (5) further comprises: and pumping out the non-condensable gas in the non-condensable gas filter by adopting a fan.
19. The process of any one of claims 10 to 18, wherein the oil-based drilling waste has a solid phase content of 10 to 80% by mass.
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| CN114853301A (en) * | 2022-04-20 | 2022-08-05 | 常州大学 | Oil-based mud treatment device and oil-based mud treatment method |
| CN118403380A (en) * | 2024-05-22 | 2024-07-30 | 四川君和环保股份有限公司 | A system and process for treating oil-based slurry mixed with solid particles |
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