CN203922795U - Oil slick in difference removal oily(waste)water based on profit buoyancy and the device of sand setting - Google Patents

Abstract

The utility model discloses a device for removing floating oil and sand in oily wastewater based on different buoyancy of oil and water, comprising: an indicating block limit frame, an indicating block, an oil-free water pool, an aeration head, an oil floating sand settling tank, Inclined plate sedimentation area, sand settling area, sewage distribution pipe, oil slick receiving tank, first ultrasonic level gauge, transverse jet, oil slick area, second ultrasonic level gauge, third ultrasonic level gauge, water inlet pipe, The fourth ultrasonic liquid level gauge, sealing cover, and flow meter; an indicator block capable of judging the thickness change of the oil slick layer is set on the upper part of the oil slick grit chamber, and the thickness of the oil slick layer can be determined indirectly through the change of the height of the exposed liquid surface of the indicator block Therefore, the oil slick layer floating above the water surface in the upper part of the oil slick grit chamber can be automatically removed by judging the change of the height of the indication block exposed to the liquid surface. The structure of the utility model is simpler and concise, and has the characteristics of convenient manufacture and installation, low cost and high reliability.

Description

A device for removing floating oil and sand in oily wastewater based on the difference in buoyancy of oil and water

technical field

The utility model belongs to the technical field of oily wastewater treatment, in particular to a device for removing floating oil and sand in oily wastewater based on different buoyancy of oil and water.

Background technique

Oily substances enter the water through different ways to form oily wastewater. Due to its large volume and wide range, and the characteristics of being difficult to treat, it becomes a kind of seriously harmful wastewater. Its sources mainly include: oil exploration in the petroleum industry and processing, refining, storage and transportation of oil products; oily waste water discharged from car washing in the transportation industry and oil washing tanks in railway locomotive depots; steel rolling water produced in the process of machinery manufacturing and processing , lubricating oil and other waste water mainly emulsified oil; in addition, waste water from catering industry, textile industry, food processing industry and other manufacturing industries also contains a large amount of oily substances.

The existence forms of oil substances in water can be divided into four categories: floating oil, dispersed oil, emulsified oil and dissolved oil. Oil slicks have larger particle size, larger than 100 μm, and are easy to surface to form oil film and oil layer. The particle size of oil droplets of dispersed oil is generally 10-100 μm, and the tiny particles are suspended in water, which is unstable and often forms oil slick after standing for a period of time. Emulsified oil is formed due to the presence of surfactants in water, and the particle size of oil droplets is extremely small, generally less than 10 μm. Dissolved oil is an oil that is chemically dissolved in water, and its particle size can reach several nanometers.

At present, the treatment methods for slick oil, dispersed oil and emulsified oil (accounting for more than 90% of the total oil content) in oily wastewater are to try to make oil in different states float on the water surface, and then use oil scraping device, oil skimming device, The oil suction device separates these oily substances from the water. But these degreasing devices have at least several of the following disadvantages:

1. Oil and water cannot be strictly distinguished when removing oil slicks, especially when the oil content is small, it is easy to remove oil and water together, that is, a large amount of water is entrained in the process of removing oil slicks, so that the separated oil contains lots of moisture;

2. The device is relatively complicated, not easy to install underground, and the price is high;

3. Troublesome maintenance;

4. Inconvenient automation.

5. The existing oily wastewater treatment device has the problems of high cost, low reliability and complex structure.

Utility model content

The purpose of the embodiment of the utility model is to provide a device based on oil-water buoyancy to remove floating oil and sand in oily wastewater, aiming to solve the problem of high cost, low reliability and complex structure in the existing oily wastewater treatment device question.

The embodiment of the utility model is achieved in this way, a device for removing oil slick and sand settling in oily wastewater based on the difference in oil-water buoyancy, the device for removing oil slick and sand settling in oily wastewater based on the difference in oil-water buoyancy includes:

Indicating block limit frame, indicating block, oil-free water pool, aeration head, water collecting pipe, oil slick grit chamber, inclined plate sedimentation area, sand settling area, mud discharge pipe, sewage distribution pipe, oil slick receiving tank, suction pipe , the first solenoid valve, the drain pipe, the first ultrasonic liquid level gauge, the second solenoid valve, the transverse jet, the oil slick area, the second ultrasonic level gauge, the third ultrasonic liquid level gauge, the water inlet pipe, and the third solenoid valve , oil discharge pipe, fourth solenoid valve, fourth ultrasonic liquid level gauge, oil suction pipe, fifth solenoid valve, sealing cover, flow meter;

The aeration heads are respectively set at the bottom of the oil-free water tank and the upper part of the sand settling area of the oil-free grit settling tank, and are respectively at the upper middle position of the bottom of the oil-free water tank and the bottom of the oil-slick grit settling tank; On the left side of the water tank, the first solenoid valve is installed on the suction pipe, and the first ultrasonic liquid level gauge is installed in the middle of the top of the oil-free water pool;

The oil slick grit chamber is set on the right side of the oil-free water tank, the inclined plate sedimentation area of the oil slick grit chamber is set in the middle of the oil slick grit chamber, and the grit chamber of the oil slick grit chamber is set at the center of the oil slick grit chamber. At the bottom of the tank, the mud discharge pipe is set in the middle of the bottom of the grit chamber of the oil slick grit chamber, the water collection pipe is set under the left side of the inclined plate sedimentation area of the oil slick grit chamber, and the water collection pipe is connected to the oil-free water tank The drainpipe on the partition wall in the middle of the oil slick grit chamber, the second solenoid valve is set on the drainpipe, and the horizontal jets are arranged in arrays opposite to each other above the left and right sides of the inclined plate sedimentation area of the oil slick grit chamber. The oil slick area of the oil slick grit chamber is set above the oil slick grit chamber, the indicator block limit frame is installed on the top of the oil slick grit chamber, and the indicator block is placed on the indicator block limit frame (the indicator block can be placed on the liquid Under the action of buoyancy, as the liquid level changes up and down in the limit frame of the indicating block), the second ultrasonic level gauge is installed above the indicating block, and the third ultrasonic level gauge is installed on the second ultrasonic level gauge Above the liquid level on the right side of the tank, the water inlet pipe is set on the right side of the floating oil grit chamber, the third solenoid valve is set on the water inlet pipe, and the sewage distribution pipe is connected to the water inlet pipe;

The oil slick receiving tank is set on the right side of the oil slick grit chamber, the oil suction pipe is installed on the right side of the oil slick receiving tank, the fifth solenoid valve is installed on the oil suction pipe, the flow meter is installed under the fifth solenoid valve, and the sealing cover Installed on the top of the oil slick receiving tank, the oil discharge pipe is installed on the partition wall between the oil slick grit chamber and the oil slick receiving tank, and communicates with the oil slick area of the oil slick grit chamber, and the fourth solenoid valve is installed on the oil discharge pipe On the top, the fourth ultrasonic liquid level gauge is installed under the sealing cover.

Further, the method for indicating that the height above the liquid surface of the indicator block varies with the thickness of the oil slick layer includes:

First, place an indicator block with a specific gravity slightly smaller than oil in the upper oil slick layer and water of the oil slick grit chamber, and at the same time, the indicator block neither absorbs oil nor water, that is, the indicator block always maintains the same specific gravity no matter it is immersed in oil or water. With the continuous entry of oily wastewater into the oil slick grit chamber, the slick oil, dispersed oil and emulsified oil contained in the wastewater will continue to float up and form an oil slick layer on the upper surface of the wastewater. If the indicator block is placed in the buoy In the oil grit chamber, the indicator block will float above the oil slick grit chamber, and the height of the indicator block above the liquid level due to the difference in oil and water density will vary according to the thickness of the oil slick layer, and the variation rules are as follows:

Suppose the specific gravity of waste _oil is ρoil, generally less than 0.85t/m ³ , the specific gravity of waste water is ρ _water , generally greater than 1.0t/m ³ , the specific gravity of the indicator block is: ρ _means , choose 0.79t/m ³ or less, and indicate The height, cross-sectional area and total weight of the block are respectively: h _, S _, and W ( _indicating that the _block is a cylinder or a regular prism) _. Slightly larger than δ _row , but it must be ensured that W _{refers to} > δ _row and S _{refers to} ρ _oil ). Secondly, when the liquid level of the oil slick grit chamber reaches the highest level, according to the difference in the thickness of the oil slick layer formed on the waste water at this time, the change law of the height of the liquid surface leaked from the indicator block is as follows:

Assuming that when the liquid level of the oil slick grit chamber reaches the highest level, the thickness of the oil slick layer formed on the waste water is δ, and the height of the indicator block intruding into the water is set as: h _water . According to the relevant knowledge of buoyancy in physics:

ρ _water h _water S _finger + ρ _oil δS _finger = W _finger

Because ρ _water , ρ _oil , S _finger and W _{finger are} fixed values in the above formula, if the thickness δ of the oil slick in the above formula changes, the height of the indicator block intruding into the water will also change. When δ increases, its increment is set as: Δδ, at this time the height h _water of the indicator block immersed in water must decrease, and its decrease is set as: Δh _water , then there is the following relationship between Δδ and Δh _water , namely

Δδρ _oil = Δh _water ρ _water

by formula It can be seen that when the thickness of the oil slick layer on the upper part of the oil slick grit chamber increases, the increase is greater than the decrease in the height of the indicator block immersed in water, that is, Δδ>Δh _water . That is to say, the increase Δδ of the thickness of the indicator block immersed in oil is greater than the decrease amount Δh of the height of the indicator block immersed in _water . Therefore, as the thickness of the oil slick on the waste water increases, that is (h _water + δ) will continue to increase, because the height Δh of the indicator block exposed to the surface of the oil slick changes _{according to} the following formula:

Δh _{refers to} = h _{refers to} - (h _water + δ)

That is to say, Δh _means that (h _water + δ _transport ) caused by the continuous increase of oil slick thickness will continue to increase and decrease continuously. That is to say, when the liquid level of the oil slick grit chamber reaches the highest level, the height of the leaked liquid level of the indicator block will decrease with the increase of the thickness of the oil slick, but when the thickness of the oil slick , the height of the indicator block leaking from the liquid level no longer decreases with the increase of the thickness of the oil slick, that is, it remains unchanged.

When the liquid level of the oil slick grit chamber reaches the highest liquid level, when the oil slick thickness δ<δ _row , the height of the indicator block leakage liquid level is set as Δh _{means thin} , when the oil slick thickness δ=δ _row , the indicator block leaks out The height of the liquid level is set as Δh _{refers to row} , when the thickness of oil slick , the height of the indicator block leaking from the liquid surface is set as Δh _{to refer to the thickness} , when the thickness of the oil slick , the height of the indicator block leaking out of the liquid level is set _to Δh. From the above, the following conclusions can be drawn:

Δh _{means thin} > Δh _{means row} > Δh _{means thick} > Δh _{means end}

Wherein, because of ρ _water h _water S _finger + ρ _oil δ _row S _finger = W _finger , this formula is transformed into:

So

is a fixed value.

Further, the specific method for removing slick oil and sand settling in oily wastewater is as follows;

Step 1, when the work starts, the central controller instructs to open the third solenoid valve (the two are connected through the control line), and at this time the other solenoid valves are all in the closed state, and the oily and sandy sewage to be treated flows into the The water inlet pipe is sent to the sewage distribution pipe through the water inlet pipe, and then the sewage distribution pipe distributes the sewage evenly in the longitudinal direction of the side of the middle and lower part of the sand settling area of the oil slick grit chamber, perpendicular to the paper surface;

Step 2, when the liquid level indicated by the third ultrasonic liquid level gauge reaches the set maximum liquid level, and the material level and liquid level data of the indicator block indicated by the second ultrasonic liquid level gauge and the third ultrasonic liquid level gauge are passed through their respective The data line connected to the central controller is transmitted to the central controller, and the central controller calculates the height Δh _finger of the indicating block exposed to the liquid surface. If Δh _finger > Δh _{finger row} , the central controller instructs to open the second solenoid valve (both are connected by control lines), and at the same time close the third solenoid valve to stop the sewage from entering, and the sewage after the oil slick and sand settling enters the drain pipe through the water collecting pipe and then flows into the oil-free pool by itself; when the third ultrasonic liquid level gauge indicates the floating When the liquid level of the oil grit chamber is consistent with the upper part of the inclined plate sedimentation area, the central controller instructs to close the second solenoid valve and open the third solenoid valve at the same time, and the sewage continues to flow into the oil floating grit chamber;

Step 3, when the liquid level indicated by the third ultrasonic liquid level gauge reaches the set maximum liquid level, and the material level and liquid level data of the indicator block indicated by the second ultrasonic liquid level gauge and the third ultrasonic liquid level gauge are passed through their respective The data line connected to the central controller is transmitted to the central controller, and the central controller calculates the height Δh _finger of the indicating block exposed to the liquid surface. If Δh _finger ≤ Δh _{finger row} , the central controller instructs to open the fourth solenoid valve (two The two are connected through the control line), and at the same time close the third electromagnetic valve to stop the sewage from entering, and the slick oil flows into the oil slick receiving pool through the oil discharge pipe; When the upper part of the oil pipe is consistent, close the fourth solenoid valve and open the third solenoid valve at the same time, the sewage continues to enter the floating oil grit chamber;

Step 4, when the first ultrasonic liquid level gauge indicates that the water level of the oil-free pool is consistent with the position 50mm below the drainpipe, and the data is transmitted to the central controller through the data line, the central controller instructs to open the first electromagnetic valve (two The two are connected by control lines), and the sewage after degreasing and sanding is pumped into the next sewage treatment process through the suction pipe. When the first ultrasonic liquid level gauge indicates that the water level of the oil-free pool is 50mm above the bottom of the pool, The central controller instructs to close the first solenoid valve;

Step 5, when the fourth ultrasonic liquid level gauge indicates that the liquid level of the oil slick receiving tank reaches the position 100mm from the lower part of the slick oil area, the central controller instructs to open the fifth solenoid valve (the two are connected by a control line) to float The oil is pumped into the waste oil collection barrel through the oil suction pipe and the flow meter, and the flow meter will transmit the amount of waste oil entering the waste oil collection barrel to the monitoring center through the wireless network. When the fourth ultrasonic liquid level meter indicates the liquid level of the floating oil receiving tank When at the position of 50mm above the bottom of the pool, the central controller instructs to close the fifth electromagnetic valve.

Further, a sealing cover is provided to prevent waste oil from being taken away without passing the flow meter.

Further, it is set to prevent the indicating block from deviating from the indicating block limiting frame of the second ultrasonic level gauge during floating.

Further, the aeration head is set to prevent the water body from becoming smelly in the oil-free water pool and the oil slick grit chamber.

Furthermore, the horizontal jets jet in pairs in opposite directions to make the waste water in the middle of the degreasing grit chamber relatively flow, increasing the chance of collision between liquid particles.

The utility model provides a device for removing slick oil and sand settling in oily wastewater based on the difference in buoyancy of oil and water. On the liquid surface of the oil slick sand settling tank, an indicator block that can distinguish the thickness change of the oil slick layer is set, and the indicator block can be passed through. The change of the height of the exposed liquid level indirectly determines the change of the thickness of the oil slick, so the oil slick floating above the water surface in the upper part of the oil slick grit chamber can be automatically removed by judging the change of the exposed liquid height of the indicator block. The structure of the utility model is simpler and concise, and has the characteristics of convenient manufacture and installation, low cost and high reliability.

Description of drawings

Fig. 1 is a schematic diagram of the structure of different devices for removing oil slicks and sand settling in oily wastewater based on oil-water buoyancy provided by the embodiment of the present invention;

In the figure: 1. Oil-free water tank; 2. Aeration head; 3. Water collection pipe; 4. Oil slick grit chamber; 5. Inclined plate sedimentation area; Water distribution pipe; 9. Oil slick receiving tank; 10. Suction pipe; 11. First solenoid valve; 12. Drainage pipe; 13. First ultrasonic liquid level gauge; 14. Second solenoid valve; 15. Transverse jet; 16 , oil slick area; 17, indicating block limit frame; 18, indicating block; 19, the second ultrasonic level gauge; 20, the third ultrasonic level gauge; 21, water inlet pipe; 22, the third solenoid valve; 23, Oil discharge pipe; 24, the fourth electromagnetic valve; 25, the fourth ultrasonic liquid level gauge; 26, oil extraction pipe; 27, the fifth electromagnetic valve; 28, sealing cover; 29, flow meter.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The application principle of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the different devices for removing oil slick and sand settling in oily wastewater based on oil-water buoyancy in the embodiment of the utility model are mainly composed of:

Oil-free water tank 1, aeration head 2, water collection pipe 3, oil slick grit chamber 4, inclined plate sedimentation area 5, sand settling area 6, mud discharge pipe 7, sewage distribution pipe 8, oil slick receiving tank 9, suction pipe 10. The first solenoid valve 11, the drain pipe 12, the first ultrasonic liquid level gauge 13, the second solenoid valve 14, the transverse jet 15, the oil slick area 16, the limit frame of the indicating block 17, the indicating block 18, the second ultrasonic Level gauge 19, third ultrasonic liquid level gauge 20, water inlet pipe 21, third solenoid valve 22, oil discharge pipe 23, fourth solenoid valve 24, fourth ultrasonic liquid level gauge 25, oil extraction pipe 26, fifth solenoid valve 27 , a sealing cover 28, and a flow meter 29;

The aeration heads 2 are respectively arranged at the bottom of the oil-free water tank 1 and the upper part of the grit chamber 6 of the oil-slick grit chamber, and are respectively located in the upper middle of the bottom of the oil-free water tank 1 and the bottom of the oil-slick grit chamber 4 Position; the suction pipe 10 is arranged on the left side of the oil-free water pool 1, the first solenoid valve 11 is installed on the water suction pipe 10, and the first ultrasonic liquid level gauge 13 is installed in the middle of the top of the oil-free water pool 1;

The oil slick grit chamber 4 is set on the right side of the oil-free water tank 1, the inclined plate sedimentation zone 5 of the oil slick grit tank is set in the middle of the oil slick grit tank 4, and the grit zone 6 of the oil slick grit tank is set At the bottom of the oil slick grit chamber 4, the mud discharge pipe 7 is arranged in the middle of the grit area 6 of the oil slick grit chamber, and the water collection pipe 3 is arranged below the left side of the inclined plate sedimentation area 5 of the oil slick grit chamber , the water collection pipe 3 is connected to the drain pipe 12 arranged on the partition wall in the middle of the oil-free water tank 1 and the oil floating grit chamber, the second electromagnetic valve 14 is arranged on the drain pipe 12, and the transverse jet 15 is arranged on the oil floating grit chamber. The upper left and right sides of the inclined plate sedimentation area are oppositely arranged in arrays, the oil slick area 16 of the oil slick grit chamber is set above the oil slick grit chamber 4, and the indicator block limit frame 17 is installed in the oil slick grit chamber 4 The top of the indicator block 18 is placed on the limit frame 17 of the indicator block (the indicator block can move up and down in the limit frame of the indicator block with the fluctuation of the liquid level under the action of the buoyancy of the liquid), the second ultrasonic level gauge 19 is installed above the indicator block 18, the third ultrasonic level gauge 20 is installed above the liquid level on the right side of the second ultrasonic level gauge 19, the water inlet pipe 21 is arranged on the right side of the floating oil grit chamber 4, and the third The solenoid valve 22 is arranged on the water inlet pipe 21, and the sewage distribution pipe 8 is connected to the water inlet pipe 21;

The oil slick receiving tank 9 is arranged on the right side of the oil slick grit chamber 4, the oil suction pipe 26 is installed on the right side of the oil slick receiving tank 9, the fifth electromagnetic valve 27 is installed on the oil suction pipe 26, and the flow meter 29 is installed on the fifth Below the electromagnetic valve 27, the sealing cover 28 is installed on the top of the oil slick receiving tank 9, and the oil discharge pipe 23 is installed on the partition wall between the oil slick grit chamber 4 and the oil slick receiver tank 9, and is connected with the oil slick grit chamber. The oil floating area 16 is connected, the fourth electromagnetic valve 24 is arranged on the oil discharge pipe 23 , and the fourth ultrasonic liquid level gauge 25 is installed under the sealing cover 28 .

In conjunction with specific application, the working principle of the present utility model is further described:

The utility model is a device (as shown in Figure 1) for automatically removing oil slicks and sand settling in oily wastewater based on the difference in oil-water buoyancy. In particular, an indicator block that can distinguish the thickness change of the oil slick layer is set on the liquid surface of the oil slick grit chamber. Judging the changes in the height of the exposed liquid level of the indicator block can automatically remove the oil slick layer floating above the water surface in the upper part of the oil slick grit chamber. Here, for the convenience of the following description, first, according to the physical principle of buoyancy and combined with Figure 1, a simple Explain the rule that the height above the liquid surface of the indicator block in the utility model changes with the thickness of the oil slick;

First place an indicator block with a specific gravity slightly smaller than oil on the oil slick layer and water on the upper part of the oil slick grit chamber (tank, barrel, box) Or the proportion in the water remains constant), with the continuous entry of oily wastewater in the oil slick grit chamber, the slick oil, dispersed oil and emulsified oil contained in the wastewater will continue to float up, and form an oil slick layer on the upper surface of the wastewater , if the indicator block is placed in the oil slick grit chamber, the indicator block will float above the oil slick grit chamber, and the height of the indicator block above the liquid level will vary according to the thickness of the oil slick layer due to the difference in oil and water density. Changes with the change, the change law is as follows:

Assume that the specific gravity of waste oil is ρ _oil , generally less than 0.85t/m ³ , the specific gravity of waste water is ρ _water , generally greater than 1.0t/m ³ , the specific gravity of the indicator block is: ρ _means , choose 0.79t/m ³ or less, and indicate The height, cross-sectional area and total weight of the block are respectively: h _, S _, and W ( _indicating that the block is a cylinder or a regular prism), and the thickness of the oil slick during the preset oil discharge is: δ _row ( _h It is greater than δ _row , but it must be ensured that W _{refers to} > δ _row and S _{refers to} ρ _oil ). Secondly, when the liquid level of the oil slick grit chamber reaches the highest level, according to the difference in the thickness of the oil slick layer formed on the waste water at this time, the change law of the height of the liquid surface leaked from the indicator block is as follows:

Assuming that when the liquid level of the oil slick grit chamber reaches the highest level, the thickness of the oil slick layer formed on the waste water is δ, and the height of the indicator block intruding into the water is set as: h _water . According to the relevant knowledge of buoyancy in physics:

ρ _water h _water S _finger + ρ _oil δS _finger = W _finger (1)

Because _ρwater , _ρoil , S _finger and W _are fixed values in formula (1), if the thickness δ of the oil slick in formula (1) changes, the height of the indicator block intruding into the water will also change. When δ increases, its increment is set as: Δδ, at this time the height h _water of the indicator block immersed in water must decrease, and its decrease is set as: Δh _water , then there is the following relationship between Δδ and Δh _water , that is

Δδρ _oil = Δh _water ρ _water (2)

It can be seen from formula (3) that when the thickness of the oil slick layer on the upper part of the oil slick grit chamber increases, the increase is greater than the decrease in the height of the indicator block immersed in water, that is, Δδ>Δh _water . That is to say, the increase Δδ of the thickness of the indicator block immersed in oil is greater than the decrease amount Δh of the height of the indicator block immersed in _water . Therefore, with the increase of the thickness of the oil slick above the wastewater, that is (h _water + δ) will continue to increase, because the height Δh of the indicator block exposed to the surface of the oil slick changes _{according to} the following formula:

Δh _means =h _means- (h _water +δ) (4)

That is to say, Δh _means that (h _water + δ _transport ) caused by the continuous increase of oil slick thickness will continue to increase and decrease continuously. That is to say, when the liquid level of the oil slick grit chamber reaches the highest level, the height of the leaked liquid level of the indicator block will decrease with the increase of the thickness of the oil slick, but when the thickness of the oil slick , the height of the indicator block leaking from the liquid level no longer decreases with the increase of the thickness of the oil slick, that is, it remains unchanged.

When the liquid level of the oil slick grit chamber reaches the highest liquid level, when the thickness of the oil slick δ<δ _row , the height of the indicator block leaking liquid level is set as Δh _{means thin} , when the thickness of the oil slick δ=δ _row , the indicator block leaks out The height of the liquid level is set as Δh _{refers to row} , when the thickness of oil slick , the height of the indicator block leaking from the liquid surface is set as Δh _{to refer to the thickness} , when the thickness of the oil slick , the height of the indicating block leaking out of the liquid level is set _to Δh. From the above, the following conclusions can be drawn:

Δh _{means thin} > Δh _{means row} > Δh _{means thick} > Δh _{means end} (5)

Wherein, because of ρ _water h _water S _finger + ρ _oil δ _row S _finger = W _finger , this formula is transformed into:

So

is a fixed value.

The device for automatically removing floating oil and sand in oily wastewater of the present invention is realized based on the above principles, and the realization process of the present invention is described in detail below based on the above principles;

The utility model based on the difference of oil-water buoyancy to automatically remove floating oil and sand settling device is based on the principle of liquid buoyancy, through the ultrasonic liquid (material) level meter to measure the liquid level height and the level height of the indicator block to automatically separate the oil and sand Various instruments of wastewater separation and degreasing grit chamber are shown in Figure 1, and the working process and principle are explained in conjunction with Figure 1 below;

1. When the work starts, open the third electromagnetic valve 22 (at this time, other electromagnetic valves are all closed), and the oily and sandy sewage to be treated flows into the water inlet pipe 21 (or pumped in) from the ground, and passes through the water inlet pipe. 21 sent to the sewage distribution pipe 8, and then the sewage distribution pipe 8 distributes the sewage evenly in the vertical direction (direction perpendicular to the paper surface) of one side of the grit chamber in the slick grit chamber;

2. When the liquid level indicated by the third ultrasonic liquid level gauge 20 reaches the set maximum liquid level (the dotted line position in the upper part of the oil slick area in the figure), and the second ultrasonic liquid level gauge 19 and the third ultrasonic liquid level gauge 20 indicate The material level and liquid level data of the indicator block are transmitted to the central controller (pre-input into the programmed computer) through their respective data lines connected to the central controller, and the height Δh of the indicator block exposed to the liquid surface is calculated by the central controller _{Refers to} , if Δh _{refers to} > Δh _{refers to row} , the central controller instructs to open the second solenoid valve 14 (the two are connected through a control line), and at the same time close the third solenoid valve 22 to stop the sewage from entering, after the oil slick and sand settling The sewage enters the drain pipe 12 through the water collection pipe 3 and then flows into the oil-free water pool 1 by itself; when the third ultrasonic liquid level gauge 20 indicates that the liquid level of the floating oil grit chamber 4 is consistent with the upper part of the inclined plate sedimentation area 5, the central controller indicates Close the second electromagnetic valve 14, open the third electromagnetic valve 22 simultaneously, the sewage continues to flow into the floating oil grit chamber 4;

3. When the liquid level indicated by the third ultrasonic liquid level gauge 20 reaches the set maximum liquid level (the dotted line position above the oil slick area in the figure), and the second ultrasonic liquid level gauge 19 and the third ultrasonic liquid level gauge 20 indicate The material level and liquid level data of the indicator block are transmitted to the central controller through their respective data lines connected to the central controller, and the central controller calculates the height Δh _of the indicator block exposed to the liquid surface, if Δh _{≤ Δh} , the central controller instructs to open the fourth electromagnetic valve 24 (connected by the control line between the two), and close the third electromagnetic valve 22 sewage to stop entering simultaneously, and the floating oil enters the floating oil receiving pool 9 through the oil discharge pipe 23 artesian flow; When the third ultrasonic liquid level meter 20 indicates that the liquid level of the oil floating grit chamber 4 is consistent with the top of the oil discharge pipe 23, the fourth electromagnetic valve 24 is closed and the third electromagnetic valve 22 is opened simultaneously, and the sewage continues to enter the oil floating grit chamber 4;

4. When the first ultrasonic liquid level gauge 13 indicates that the water level of the oil-free water tank 1 is consistent with the position 50mm below the drain pipe 7 of the floating oil grit chamber, the central controller (pre-input programmed computer) instructs to open the first Solenoid valve 11 (the two are connected by a control line), the sewage after degreasing and sanding is pumped into the next sewage treatment process through the suction pipe 10, when the water level of the oil-free water pool 1 is indicated by the first ultrasonic liquid level gauge 13 When the position is 50mm above the bottom of the pool, the central controller (pre-input programmed computer) instructs to close the first electromagnetic valve 11;

5. When the fourth ultrasonic liquid level gauge 25 indicates that the liquid level of the oil slick receiving tank 9 reaches a position 100 mm from the bottom of the slick oil area, the central controller (input into a programmed computer in advance) instructs to open the fifth solenoid valve 27 ( The two are connected by a control line) the floating oil is pumped into the waste oil collection barrel through the oil suction pipe 26 and the flowmeter 29, and the flowmeter will transmit the waste oil quantity entering the waste oil collection barrel to the monitoring center through the wireless network at the same time, so that the monitoring The center can accurately grasp the quantity of waste oil produced in time for timely deployment. If the device is applied to large hotels, restaurants and other eating places, the kitchen waste oil produced can be remotely controlled and managed, and then the raw materials of waste oil can be controlled from the source to ensure that ordinary people can eat safe oil. When the fourth ultrasonic liquid level gauge 25 indicates that the liquid level of the floating oil receiving tank 9 is at the position of 50mm above the bottom of the pool, the central controller (input into a programmed computer in advance) instructs to close the fifth electromagnetic valve 27;

6. The sealing cover 28 is set to prevent the waste oil from being taken away without the flow meter, and its function is to ensure that all the waste oil collected by the device is monitored by the monitoring center;

7. In order to prevent the indicator block 18 from deviating from the second ultrasonic level meter 19 during floating, an indicator block limiter 17 fixed on the pool wall is specially provided. The limiter 17 can not only ensure that the indicator block 18 The bottom of the level meter 19 floats up and down without deviating from the second ultrasonic level meter 19, and when the liquid level is lower than the lower end of the oil slick area, the crossbeam at the lower end of the indicating block limit frame 17 gives the indicating block 18 a support function to Ensure that it is suspended above the oil slick grit chamber, so that the height of the indicator block does not need to be too high, that is, its height is slightly greater than the thickness of the oil slick area;

8. In order to prevent the water body from becoming stinky, a small underwater aeration head 2 is installed in the oil-free water pool and the floating oil grit chamber, and the central controller (input into a programmed computer in advance) instructs the oil-free water pool and the floating oil tank every three days in summer. The aeration head in the oil grit chamber is aerated for 5-10 minutes;

In addition, in order to increase the collision between the liquid particles, especially in the middle of the degreasing grit chamber, several groups of opposite jets 15 are installed. Relative flow (including other complex flows that are difficult to describe simply) increases the chance of collision between liquid particles, thus creating more opportunities for most of the dispersed oil and some emulsified oil with smaller particles to combine into larger particles. The opportunity of oil particles, and then these oil particles naturally float to the upper part of the liquid surface, thereby increasing the oil removal efficiency by about 3%, and more importantly, the part of oil that is removed is dispersed oil and emulsified oil, usually they are difficult to remove, when When entering the next process, it will bring great difficulties to the following process (because both the dispersed oil and the emulsified oil are organic substances that are difficult to degrade, and they are difficult to biodegrade).

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. the oil slick in the removal of the difference based on profit buoyancy oily(waste)water and a device for sand setting, is characterized in that, the oil slick in this difference removal oily(waste)water based on profit buoyancy and the device of sand setting comprise:

Indicator dog position-limited rack, indicator dog, without profit pond, aeration head, header, oil slick settling pit, sloping plate deposition district, sand setting district, shore pipe, sewage water distributor, oil slick reception tank, drinking-water pipe, the first magnetic valve, water shoot, the first ultrasonic level gage, the second magnetic valve, transverse jet device, oil slick district, the second ultrasonic material level meter, the 3rd ultrasonic level gage, water inlet pipe, the 3rd magnetic valve, oil exit pipe, the 4th magnetic valve, the 4th ultrasonic level gage, oil pick-up tube, the 5th magnetic valve, sealing cover, under meter,

Aeration head is separately positioned on the upper position without the sand setting district of oil tank bottom and oil slick settling pit, and respectively in mid-way on the upper side bottom oil tank bottom and oil slick settling pit; Drinking-water pipe is arranged on without oil tank left side, and the first magnetic valve is arranged on drinking-water pipe, and the first ultrasonic level gage is arranged on the mid-way without oil tank top;

Oil slick settling pit is arranged on the right side without profit pond, the sloping plate deposition district of oil slick settling pit is arranged on the mid-way of oil slick settling pit, the sand setting district of oil slick settling pit is arranged on the bottom of oil slick settling pit, shore pipe is arranged on the mid-way of the bottom, sand setting district of oil slick settling pit, header is arranged on the below in the left side, sloping plate deposition district of oil slick settling pit, header connects the water shoot being arranged on without on the partition wall in the middle of profit pond and oil slick settling pit, the second magnetic valve is arranged on water shoot, transverse jet device is left in the sloping plate deposition district of oil slick settling pit, the top of right both sides arranges in opposite directions, the oil slick district of oil slick settling pit is arranged on the top of oil slick settling pit, indicator dog position-limited rack is arranged on the top of oil slick settling pit, indicator dog is placed on indicator dog position-limited rack, the second ultrasonic material level meter is arranged on the top of indicator dog, the 3rd ultrasonic level gage is arranged on the top of the right side liquid level of the second ultrasonic material level meter, water inlet pipe is arranged on the right side of oil slick settling pit, the 3rd magnetic valve is arranged on water inlet pipe, sewage water distributor connects water inlet pipe,

Oil slick reception tank is arranged on the right side of oil slick settling pit, oil pick-up tube is arranged on the right side of oil slick reception tank, the 5th magnetic valve is arranged in oil pick-up tube, under meter is arranged on the below of the 5th magnetic valve, sealing cover is arranged on the top of oil slick reception tank, and oil exit pipe is arranged on the partition wall in the middle of oil slick settling pit and oil slick reception tank, is communicated with the oil slick district of oil slick settling pit, the 4th magnetic valve is arranged on oil exit pipe, and the 4th ultrasonic level gage is arranged on the below of sealing cover.

2. the oil slick in the difference removal oily(waste)water based on profit buoyancy as claimed in claim 1 and the device of sand setting, is characterized in that, is set to prevent that waste oil is without the removed sealing cover of under meter.

3. the oil slick in the difference removal oily(waste)water based on profit buoyancy as claimed in claim 1 and the device of sand setting, is characterized in that, is set to prevent that indicator dog from departing from the indicator dog position-limited rack of the second ultrasonic material level meter in floating.

4. the oil slick in the difference removal oily(waste)water based on profit buoyancy as claimed in claim 1 and the device of sand setting, is characterized in that, is set to prevent the aeration head without profit pond and the fouling of oil slick settling pit water body.