CN211635816U - Dust removal device for removing harmful gas in industrial flue gas - Google Patents

Abstract

The utility model relates to a dust removal device for removing harmful gases in industrial flue gas, comprising a rotary furnace, a combustion settling chamber, a quenching tower, a circulating fluidized bed absorption tower, a bag-type dust collector, a filter, a fan, a bag-type dust collector, a The dust collector includes a bracket, a box, a filter bag and a control device. The filter bag includes a base cloth and a filter cloth. The base cloth is a grid-like plain weave cloth. The plain weave cloth is woven from several warp and weft threads. The filter cloth is made of thermoplastic fibers. The formed non-woven fabric has an adhesive layer between the base cloth and the filter cloth; the detection device at the outlet of the fan is electrically connected with the control cabinet, the Internet of Things, and the central control room. The utility model has better dust collecting and dedusting effects, the filter bag is not easy to block, realizes continuous and stable dedusting and material recovery, operates continuously and stably, has good air purification effect, and realizes real-time monitoring of the dedusting effect, which is beneficial to the remote control of equipment by manufacturing enterprises. Monitoring and Operation.

Description

A dust removal device for removing harmful gases in industrial flue gas

technical field

The utility model relates to the technical field of dust removal devices, in particular to a dust removal device for removing harmful gases in industrial flue gas.

Background technique

In the process of metal smelting, there will be dust, soot, NOX, SOX, dioxin, heavy metal and other waste gas and dust. Lead fume and lead dust are extremely harmful to human body. The traditional lead fume purification equipment is basically a wet dust collector, such as a water bath type, a water-spraying packed tower, a spray chamber, etc. These are mostly water washing methods. For lead fume and lead dust in aerosol state, ordinary spraying is used. Equipment, its coagulation and absorption effects are not ideal, and traditional methods cannot effectively remove NOX, SOX, dioxins, heavy metals and other harmful substances in the exhaust gas.

The existing bag filter is usually composed of a bottom steel structure bracket, an ash hopper, a box, an air inlet and outlet, a filter bag, a jet cleaning device and a control device. The surface of the filter cloth used in the filter bag of the dust collector is generally a flat structure. During the working process of the dust collector, the dust gradually accumulates on the surface of the filter cloth of the filter bag. When the dust accumulates on the surface of the filter cloth to a certain extent, the pressure difference between the inside and outside of the filter bag is generated. Reversed, or the filter bag is vibrated by the blowing device of the dust collector, so that the dust on the surface of the filter bag shakes and falls. The filter cloth of the existing filter bag will be blocked after long-term use. When the filter bag vibrates, the amount of dust shaken will decrease, which not only affects the filtering and dust removal effect of the dust collector, but also increases the damage rate of the filter bag and reduces the use of the filter bag. life. The diameter of the dust particles filtered by the ordinary filter bag of the existing bag filter is relatively large, and a large amount of dust with a small particle diameter is still discharged into the atmosphere, which can no longer meet the requirements for some industries with high environmental protection standards; and the dust collector The dust removal effect cannot be monitored in real time.

Utility model content

In view of the above deficiencies of the existing dust removal devices, the purpose of the present invention is to provide a dust removal device with better dust removal effect for removing harmful gases in industrial flue gas, and at the same time realize real-time monitoring of the dust removal effect.

The purpose of this utility model is to realize by adopting the following technical solutions:

A dust removal device for removing harmful gases from industrial flue gas, comprising a rotary furnace, a combustion settling chamber, a quenching tower, a circulating fluidized bed absorption tower, a bag filter and a filter connected in sequence, and the filter is connected with a fan , the bottom of the circulating fluidized bed absorption tower is provided with a desulfurizer storage and a water spray nozzle, the middle is provided with an active coke purification filter layer, and the upper part of the active coke purification filter layer is provided with an ammonia gas nozzle; the bag filter includes a bracket, a box body, blowing device, filter bag and control device, the filter bag is set in the box, the filter bag includes a base cloth and a filter cloth, the base cloth is a grid-like plain weave cloth, and the plain weave cloth is woven from several warp and weft threads. The warp and weft are perpendicular to each other; the filter cloth is a non-woven fabric composed of thermoplastic fibers, and an adhesive layer is arranged between the base cloth and the filter cloth and is connected to form an integral structure;

The side of the box body is provided with an air inlet and an air outlet respectively, an ash hopper is arranged under the box body, and a mechanical ash cleaning mechanism is arranged in the ash hopper; the control device includes a control cabinet, a PLC programmable controller and a pulse controller, The PLC programmable controller is connected with the pulse controller and the blowing device circuit; the blowing device is arranged on the top of the box, and the blowing device is connected with the air compressor through the pipeline; the air inlet and the air outlet are provided with The air inlet channel is provided with an air volume regulating valve, and the box body is provided with an air inlet channel switching mechanism; the outlet of the fan is provided with a detection device, and the detection device is electrically connected with the control cabinet.

As a preferred technical solution of the present invention, the bag filter is a low-pressure injection pulse bag filter; the mechanical cleaning mechanism includes a driving cylinder and a cleaning rake, and the cleaning rake is connected to the driving cylinder and can pass through the cylinder. The drive performs reciprocating motion, and the drive cylinder is connected with the air compressor through the intake pipe; the control cabinet is electrically connected with the central control room through the Internet of Things.

As a preferred technical solution of the present invention, the lower part of the circulating fluidized bed absorption tower adopts a Venturi tube, and the Venturi tube is a conical constriction section, a cylindrical section and a conical expansion section in order from bottom to top; the desulfurization agent storage The water spray nozzle is arranged in the conical expansion section; the water spray nozzle is arranged in the conical constriction section, and an electric precipitator is arranged under the conical constriction section.

As a preferred technical solution of the present invention, the active coke purification filter layer is in the shape of a hemisphere, and the convex spherical surface faces the direction of the incoming flue gas.

As a preferred technical solution of the present invention, the base fabric is composed of two layers of woven fabric, the first layer of base fabric is the plain weave fabric; the second layer of woven fabric is a twill weave fabric, and the twill weave fabric is composed of several warp threads and weft threads. Woven, the angle between the warp and the weft is 45 degrees.

As a preferred technical solution of the present invention, an adhesive layer is also provided between the first layer of plain weave fabric and the second layer of twill weave fabric.

As a preferred technical solution of the present invention, the non-woven fabric comprises polyester fibers or polyphenylene sulfide fibers which are laminated or blended.

As a preferred technical solution of the present invention, the adhesive layer includes resin adhesive.

The beneficial effects of the utility model are: compared with the prior art, the utility model has better dust collecting and dedusting effects, the filter bag is not easily blocked, and can effectively remove NOX, SOX, dioxins and the like in the lead-containing flue gas For harmful components, a resin glue layer is set between the filter bag base cloth and the filter cloth to enhance the ability of the filter cloth to absorb and filter dust with small particle diameters. PLC programmable controller and automatic ash unloading device are adopted to realize continuous and stable dust removal and material recovery.

The utility model has the advantages of high dust removal and recovery efficiency, continuous and stable operation, convenient operation and maintenance, good air purification effect and low use cost, and realizes real-time monitoring of dust removal effect, which is beneficial to the remote monitoring and operation and maintenance of equipment by manufacturing enterprises.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic structural diagram of the bag filter of the present invention.

FIG. 3 is a left-side structural schematic diagram of FIG. 2 .

Figure 4 is a schematic diagram of the cross-sectional structure of the filter bag of the present invention.

In the figure: 1. Rotary furnace, 2. Secondary combustion settling chamber, 3. Quench tower, 4. Filter, 5. CFB absorption tower, 51. Venturi tube, 52. Water nozzle, 53. Active Coke purification filter layer, 54, ammonia gas nozzle, 55, electrostatic precipitator, 56, desulfurizer storage, 6, bag filter, 7, fan, 8, detection device, 9, control cabinet, 10, filter bag mounting frame , 11, bracket, 12, box, 13, blowing device, 14, ash discharge device, 15, escalator platform, 16, air inlet channel switching mechanism, 17, filter bag, 18, deflector, 19, air outlet , 20, air inlet, 21, filter bag positioning frame, 22, air volume control valve, 23, filter cloth, 24, base cloth, 25, viscose layer, 26, ash hopper.

Detailed ways

As shown in Figures 1 to 4, a dust removal device for removing harmful gases from industrial flue gas comprises a rotary furnace 1, a combustion settling chamber 2, a quenching tower 3, a circulating fluidized bed absorption tower 5, The bag filter 6 and the filter 4, the filter 4 is connected with the fan 7, the desulfurization agent storage 56 and the water nozzle 52 are arranged at the bottom of the circulating fluidized bed absorption tower 5, and the active coke purification filter layer 53 is arranged in the middle. An ammonia gas nozzle 54 is provided on the upper part of the coke purification filter layer 53 .

The bag filter includes a bracket 11, a box 12, a blowing device 13, a filter bag 17 and a control device. The filter bag 17 is arranged in the box 12, and the side of the box 12 is respectively provided with an air inlet 20 and an air outlet 19. There is an ash hopper 26 below the box body 12, and the control device includes a control cabinet 9, a PLC programmable controller and a pulse controller, and the PLC programmable controller is connected to the pulse controller and the injection device 13 circuit; The blowing device 13 is arranged on the top of the box body 12, and the blowing device 13 is connected with the air compressor through a pipeline; an air inlet channel is provided between the air inlet 20 and the air outlet 19, and an air volume regulating valve 22 is arranged on the air inlet channel. , the box body 12 is provided with an air inlet channel switching mechanism 16 . One side of the inner surface of the ash hopper 26 is provided with a mechanical ash cleaning mechanism; the outlet of the fan 7 is provided with a detection device 8, and the detection device 8 is electrically connected to the control cabinet 9, and the control cabinet 9 is electrically connected to the central control room through the Internet of Things. Connection; the detection device 8 includes an automatic smoke and dust smoke tester or a smoke and dust detector.

In this embodiment, the bag filter 6 is a low-pressure injection pulse bag filter; the cleaning mechanism in the hopper 26 includes a driving cylinder and a cleaning rake, and the cleaning rake is connected to the driving cylinder and can be driven by the cylinder The reciprocating motion is carried out, and the driving cylinder is connected with the air compressor through the intake pipe. The intake pipe is connected with a solenoid valve, the intake end of the solenoid valve is connected with the manual air valve, the intake end of the manual air valve is connected with the air compressor; the solenoid valve is electrically connected with the control cabinet 9 .

The air inlet 20 is connected with the ash hopper 26, and the ash hopper 26 is connected with the ash unloading device 14, and the ash unloading device 14 is an automatic ash unloading device screw conveyor. The blowing device 13 includes a blowing pipe, a nozzle and a solenoid valve. The solenoid valve is arranged on the blowing pipe and is connected to the pulse controller circuit. The pulse controller includes a differential pressure feedback pulse controller. The upper end of the filter bag 17 is connected to the filter bag mounting frame 10, the lower end of the filter bag 17 is connected to the filter bag positioning frame 21, and a baffle 18 is arranged between the filter bags 17; the outer wall of the ash hopper 26 is provided with a bin wall vibrator , to enhance the cleaning effect. An escalator platform 15 is also arranged on the top of the box body 12 , and an air inlet channel switching mechanism 16 is arranged on the escalator platform 15 .

The lower part of the circulating fluidized bed absorption tower 5 adopts a Venturi tube 51, and the Venturi tube 51 is sequentially composed of a conical constriction section, a cylindrical section and a conical expansion section from bottom to top; the desulfurizer storage 56 is arranged in the conical constriction section; spray The water nozzle 52 is arranged in the conical expansion section, and an electrostatic precipitator 55 is arranged under the conical constriction section. The electrostatic precipitator 55 is used to preliminarily filter the chemical reaction in the circulating fluidized bed absorption tower 5 to produce calcium sulfate, dust, dioxins and heavy metals. The active coke purification filter layer 53 is in a hemispherical shape, and the convex spherical surface faces the direction of the flue gas. filter effect.

The filter bag 17 in this embodiment includes a base cloth 24 and a filter cloth 23, the base cloth 24 is a grid-like plain weave cloth, and the plain weave cloth is woven from a number of warp and weft threads, and the warp and weft threads are perpendicular to each other; the filter The cloth 23 is a non-woven fabric made of thermoplastic fibers, and an adhesive layer 25 is provided between the base cloth 24 and the filter cloth 23 and connected to form an integral structure. The base cloth 24 is composed of two layers of woven cloth. The first layer of base cloth is the plain weave cloth; The angle between them is 45 degrees. There is also an adhesive layer between the first layer of plain weave cloth and the second layer of twill weave cloth; the adhesive layer 25 is resin glue; the non-woven fabric includes polyester fibers or polyphenylene sulfide fibers by lamination or blending. to make. The structure of this embodiment is beneficial to the adsorption of dust particles by the composite filter cloth as a whole.

The above embodiments are only intended to illustrate the concept and technical features of the present invention, and the purpose is to let those skilled in the art understand the technical solutions and implementations of the present invention, and cannot limit the protection scope of the present invention accordingly. All equivalent replacements or equivalent changes made according to the technical solutions of the present utility model shall be covered within the protection scope of the claims of the present utility model.

Claims (8)

1. The utility model provides a dust collector for getting rid of harmful gas in industrial flue gas, characterized by: the dust removal device comprises a rotary furnace, a combustion settling chamber, a quench tower, a circulating fluidized bed absorption tower, a bag type dust remover and a filter which are sequentially connected, wherein the filter is connected with a fan, the bottom of the circulating fluidized bed absorption tower is provided with a desulfurizer storage device and a water spray nozzle, the middle part of the circulating fluidized bed absorption tower is provided with an active coke purification filter layer, and the upper part of the active coke purification filter layer is provided with an ammonia gas nozzle; the bag type dust collector comprises a support, a box body, a blowing device, a filter bag and a control device, wherein the filter bag is arranged in the box body, the filter bag comprises base cloth and filter cloth, the base cloth is latticed plain woven cloth, the plain woven cloth is woven by a plurality of warps and wefts, and the warps and the wefts are mutually vertical; the filter cloth is a non-woven fabric formed by thermoplastic fibers, and an adhesive layer is arranged between the base cloth and the filter cloth and connected to form an integral structure;

the side surface of the box body is respectively provided with an air inlet and an air outlet, an ash hopper is arranged below the box body, and a mechanical ash cleaning mechanism is arranged in the ash hopper; the control device comprises a control cabinet, a PLC (programmable logic controller) and a pulse controller, wherein the PLC is in circuit connection with the pulse controller and the blowing device; the blowing device is arranged on the box body and is connected with the air compressor through a pipeline; an air inlet channel is arranged between the air inlet and the air outlet, an air quantity regulating valve is arranged on the air inlet channel, and an air inlet channel switching mechanism is arranged on the box body; and a detection device is arranged at the outlet of the fan and is electrically connected with the control cabinet.

2. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the bag type dust collector is a low-pressure blowing pulse bag type dust collector; the mechanical ash removal mechanism comprises a driving cylinder and an ash removal rake, the ash removal rake is connected with the driving cylinder and can be driven by the cylinder to reciprocate, and the driving cylinder is connected with an air compressor through an air inlet pipe; the control cabinet is electrically connected with the central control room through the Internet of things.

3. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the lower part of the absorption tower of the circulating fluidized bed adopts a Venturi tube which sequentially comprises a conical contraction section, a cylindrical section and a conical expansion section from bottom to top; the desulfurizer storage is arranged on the conical expansion section; the water spray nozzle is arranged on the conical contraction section, and an electric dust collector is arranged below the conical contraction section.

4. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the active coke purifying and filtering layer is in a hemispherical shape, and the convex spherical surface faces to the direction of flue gas inlet.

5. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the base cloth is composed of two layers of woven cloth, and the first layer of base cloth is the plain woven cloth; the second layer is woven cloth and is woven cloth for the twill, and the twill is woven cloth and is woven by a plurality of warp and weft and form, and the contained angle between its warp and the weft is 45 degrees.

6. The dust removing device for removing harmful gases in industrial flue gas according to claim 5, which is characterized in that: an adhesive layer is also arranged between the plain woven cloth and the twill woven cloth.

7. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the non-woven fabric is formed by laminating or blending polyester fibers or polyphenylene sulfide fibers.

8. The dust removing device for removing harmful gases in industrial flue gas according to claim 1, which is characterized in that: the adhesive layer comprises resin adhesive.

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