CN113663448A - Device and method for treating high-concentration oil smoke and particulate waste gas - Google Patents
Device and method for treating high-concentration oil smoke and particulate waste gas Download PDFInfo
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- CN113663448A CN113663448A CN202111037282.9A CN202111037282A CN113663448A CN 113663448 A CN113663448 A CN 113663448A CN 202111037282 A CN202111037282 A CN 202111037282A CN 113663448 A CN113663448 A CN 113663448A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 85
- 239000000779 smoke Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 230000005684 electric field Effects 0.000 claims abstract description 60
- 239000010865 sewage Substances 0.000 claims abstract description 46
- 238000004140 cleaning Methods 0.000 claims abstract description 39
- 239000000428 dust Substances 0.000 claims abstract description 38
- 238000000926 separation method Methods 0.000 claims abstract description 37
- 238000004062 sedimentation Methods 0.000 claims description 19
- 230000008602 contraction Effects 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 18
- 238000000746 purification Methods 0.000 claims description 15
- 239000013618 particulate matter Substances 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 5
- 238000007667 floating Methods 0.000 claims description 5
- 239000002351 wastewater Substances 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 4
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- 238000005406 washing Methods 0.000 claims description 4
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- 238000012423 maintenance Methods 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 6
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- 230000005611 electricity Effects 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000007792 gaseous phase Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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Abstract
The invention provides a device and a method for treating high-concentration oil smoke and particulate waste gas, which comprises a vertical tube type electrostatic device, wherein a plurality of cylinder electric fields are arranged in the vertical tube type electrostatic device, a needle type discharge electrode is arranged in the middle of each cylinder electric field, a dust collecting electrode is arranged on the tube wall of the vertical tube type electrostatic device, a three-way reversing valve is arranged above each cylinder electric field and is controlled by a program, a waste gas inlet of the vertical tube type electrostatic device is connected with a waste gas outlet of a gas-water separator, and an outlet of the vertical tube type electrostatic device is connected with an inlet of a sewage separation device. The invention has the characteristics of low cost, online cleaning and maintenance without shutdown, water recycling and the like.
Description
Technical Field
The invention relates to the technical field of industrial waste gas treatment, in particular to a device and a method for treating high-concentration oil smoke and particulate waste gas.
Background
In some industrial production, exhaust gas with high oil smoke and particulate matter concentration can be generated, the exhaust gas is easy to block due to particulate matter, the viscosity of the oil smoke is very high, equipment needs to be frequently shut down for cleaning and maintenance, consumable materials are frequently replaced, and the treatment cost is very high. For example, the oil fume concentration of a setting machine commonly used in the printing and dyeing industry is as high as 1000mg/m3The concentration of the particles reaches 250mg/m3The waste gas is usually sprayed and electrostatic combined, and after the waste gas is used for a period of time, the spraying tower and the electrostatic polar plate need to be stopped to clean, so that the production is interrupted, and the maintenance cost is high.
In the process of recycling waste circuit boards, the components on the circuit boards are generally removed, and the waste circuit boards are heated to about 200 ℃ by a heating method, and the soldering tin is melted to separate the components from the light boards. Because the waste circuit board is heated at high temperature, in order to generate a large amount of tar and particulate matters, the concentration of pollutants in the waste gas is high, the peculiar smell is serious, and the combined methods of spraying, static electricity and the like are also generally adopted, so that the difficulty of shutdown cleaning and maintenance is also existed.
The prior art discloses a system and a method for comprehensively treating waste gas of a setting machine, wherein a patent method is 201910956206.4, and specifically discloses that a method for removing oil smoke and particles in the waste gas of the setting machine adopts a dry filter (filter screen), spraying, wet static electricity and other combination modes, and a heat exchanger is used for assisting in waste gas cooling and heat recovery, but filter blockage and replacement and spray tower blockage and replacement may exist. Meanwhile, moisture cannot be effectively removed by adopting wet static electricity, and exhaust gas is reheated (the temperature of the exhaust gas is raised to 80 ℃) in order to prevent the water vapor in the flue gas from being condensed to generate white fog. The comprehensive waste gas treatment process is long, and the operation cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for treating high-concentration lampblack and particulate matter waste gas.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a processing apparatus of high concentration oil smoke and particulate matter waste gas, includes riser formula electrostatic equipment, the inside a plurality of drum electric fields that are equipped with of riser formula electrostatic equipment, the centre in drum electric field is equipped with the needle discharge electrode, the pipe wall of riser formula electrostatic equipment is equipped with the utmost point that gathers dust, drum electric field top is provided with the tee bend switching-over valve, the tee bend switching-over valve passes through program control, the waste gas import of riser formula electrostatic equipment is connected with gas-water separator's exhaust outlet, the export of riser formula electrostatic equipment is connected with sewage separation plant's import department.
Still include wet-type venturi dust collector, wet-type venturi dust collector includes shrink tube, choke and diffuser, shrink tube department is equipped with atomizing nozzle, wet-type venturi dust collector diffuser pipe end with deareator's access connection, deareator's export with wastewater separation device's access connection, wastewater separation device's delivery port with wet-type venturi dust collector's shrink union coupling.
The gas-water separator is a rectangle with an interface of 2500 x 2500MM, and the needle type discharge electrode and the dust collecting electrode are both made of 304 stainless steel.
As a further improvement of the invention: the first valve of the three-way reversing valve is connected with a waste gas inlet of the vertical pipe type electrostatic equipment, the second valve of the three-way reversing valve is connected with a washing water inlet of the vertical pipe type electrostatic equipment, and the third valve of the three-way reversing valve controls the vertical pipe type electrostatic equipment to be closed.
As a further improvement of the invention: the plurality of cylinder electric fields comprise a working cylinder electric field, a cleaning cylinder electric field and a closed draining cylinder electric field.
As a further improvement of the invention: at least 305 cylinder electric fields are arranged, 235 cylinder electric fields are in a working state during working, at least 20 cylinder electric fields are in a cleaning state, and at least 50 cylinder electric fields are in a closing or draining state.
As a further improvement of the invention: the sewage separation device is provided with an oil-water separator and a sedimentation tank, and the sedimentation tank is positioned below the inlet of the sewage separation device.
As a further improvement of the invention: an inclined plate is arranged in the sedimentation tank, and a sludge discharge port is arranged at the bottom of the sedimentation tank.
As a further improvement of the invention: and an outlet at the bottom of the vertical pipe type electrostatic equipment is connected with an inlet of the sewage separation device.
A method for treating high-concentration oil smoke and particulate waste gas by adopting the device,
(1) the waste gas is pretreated by a wet venturi dust collector: an atomizing nozzle at the contraction pipe of the wet Venturi dust collector sprays water mist into the contraction pipe, and oil smoke, particulate matters and atomized water drops in the waste gas are contacted with each other to finish the capture process;
(2) the pretreated waste gas and the sewage with oil smoke, particles and atomized water drops enter a gas-water separator for preliminary purification: waste gas is separated from a large amount of water containing oil smoke and particles, sewage is discharged into a sewage separation device from an outlet of a gas-water separator, and the waste gas enters vertical pipe type electrostatic equipment from an exhaust gas outlet of the gas-water separator for deep purification;
(3) the sewage in the step (2) firstly enters a sedimentation tank in a sewage separation device to separate and precipitate particulate matters through an inclined plate, the particulate matters are precipitated in a sludge form and discharged from a sludge discharge port of the sedimentation tank, then enter an oil-water separator to separate oil smoke and water, the oil smoke is discharged from the upper layer of the oil-water separator in a floating oil form, and the separated water is circulated back to a contraction pipe of the wet type Venturi dust collector to be used as spray water of an atomizing nozzle;
(4) enabling the waste gas in the step (2) to enter vertical pipe type electrostatic equipment through a program control three-way reversing valve, enabling the vertical pipe type electrostatic equipment to start working, enabling residual particulate matters and oil smoke in the waste gas to move to a dust collecting electrode under the action of a cylindrical electric field and be adsorbed on the dust collecting electrode, and enabling high-pressure cleaning water to wash the pipe wall of the vertical pipe type electrostatic equipment through the program control three-way reversing valve;
(5) switching the cylindrical electric fields in the step (4) by 10 pieces at a time according to the state sequence of working, cleaning, closing and working every hour, wherein 235 cylindrical electric fields are in a working state, at least 20 cylindrical electric fields are in a cleaning state, and at least 50 cylindrical electric fields are in a closing state;
(6) the waste gas in the step (2) is deeply purified by the vertical pipe type electrostatic equipment and then is released from a bottom waste gas discharge port, and the washed particulate matters, the oil smoke and the washing water flow into a sewage separation device from a bottom outlet of the vertical pipe type electrostatic equipment to be treated in the step (3);
(7) after the deep purification of the waste gas is finished, the three-way reversing valve is controlled by a program to close the operation of the vertical pipe type electrostatic equipment;
(8) and (4) naturally draining water on the pipe wall of the closed vertical pipe type electrostatic equipment, and enabling the drained water to flow into the sewage separation device from the bottom outlet of the vertical pipe type electrostatic equipment for the treatment in the step (3).
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts a combination method of wet venturi dust collector dust removal and vertical pipe type electrostatic equipment, can remove particles and oil stains without blocking, and compared with a gas-liquid contact method using a filler such as a spray tower, the wet venturi dust collector can be used for removing particles and oil stains with low cost stably for high oil smoke and dust waste gas for a long time, and has the advantages of simple operation and convenient maintenance.
2) The vertical pipe type electrostatic equipment is provided with a plurality of groups of vertical pipes according to the design, and the number of the vertical cylinders in the working state, the vertical cylinders in the cleaning state and the vertical cylinders in the closing state is further adjusted by controlling the three-way valve through a program, so that the switching between the waste gas introduction and the high-pressure cleaning water is realized. And time intervals are set by a program, so that the vertical cylinders are sequentially cleaned on line, the static equipment does not need to be stopped, and the function of maintaining without stopping or replacing consumables is realized.
3) The spraying cleaning water adopts a precipitation and oil-water separation method to separate the waste water containing oil smoke and particulate matters, and the water can be recycled, so that the use amount of the water is greatly reduced, and the machine does not need to be stopped for maintenance.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying description and examples:
as shown in figure 1, the invention provides a high concentration oil smoke and particulate waste gas treatment device, which comprises a wet venturi scrubber 1, a gas-water separator 2, a sewage separation device, a vertical tube type electrostatic device 4 and a three-way reversing valve 5, wherein the inlet of the wet venturi scrubber 1 is connected with a smoke exhaust pipeline, the wet venturi scrubber 1 comprises a contraction tube 11, a throat 12 and a diffusion tube 13, the contraction tube 11 is provided with an atomizing nozzle for spraying water mist into the contraction tube 11 to enable the oil smoke, dust and atomized water drops in the waste gas to contact with each other to complete a capture process, the end of the diffusion tube 13 of the wet venturi scrubber 1 is connected with the inlet 21 of the gas-water separator 2, the waste gas outlet 22 of the gas-water separator 2 is connected with the waste gas inlet 41 of the vertical tube type electrostatic device 4, the outlet 23 of the gas-water separator 2 is connected with the inlet 33 of the sewage separation device 3, the outlet 43 of the electrostatic device 5 is connected with the inlet 33 of the sewage separation device 3, and the water outlet 34 of the oil-water separator 3 is connected with the contraction pipe 11 of the wet venturi scrubber 1.
The vertical tube type electrostatic equipment 4 is internally provided with a plurality of cylinder electric fields 45, the middle of each cylinder electric field 45 is provided with a needle type discharge electrode, the wall of a cylinder tube of the vertical tube type electrostatic equipment 4 is provided with a dust collecting electrode, the needle type discharge electrodes and the dust collecting electrodes are both made of 304 stainless steel, and the electric field voltage is 1.3-1.6 ten thousand volts.
After the primarily purified waste gas enters the vertical pipe type electrostatic equipment 4, residual particulate matters and oil smoke in the waste gas move to a dust collecting electrode under the action of an electrostatic field and are adsorbed on the dust collecting electrode on the pipe wall, and a purified waste gas outlet 42 is formed in the bottom of the vertical pipe type electrostatic equipment 4.
The plurality of cylinder electric fields 45 include a work cylinder electric field, a wash cylinder electric field, and a shut down drain cylinder electric field.
Considering the problem of online cleaning, the conventional electrostatic equipment generally has 235 cylindrical electric fields with the diameter of 200MM, the vertical tubular electrostatic equipment 4 in the invention increases the cylindrical electric field 45 by at least 30% and at least 305, the 235 cylindrical electric fields are in an operating state when the vertical tubular electrostatic equipment 4 is in operation, at least 20 cylindrical electric fields are in a cleaning state, at least 50 cylindrical electric fields are in a closed draining state, and the electric field voltage is 1.3-1.6 ten thousand volts.
Meanwhile, a three-way reversing valve 5 is arranged above a cylindrical electric field 45 of the vertical pipe type electrostatic equipment 4, a first valve of the three-way reversing valve 5 is connected with a waste gas inlet 41 of the vertical pipe type electrostatic equipment 4, a second valve of the three-way reversing valve 5 is connected with a cleaning water inlet of the vertical pipe type electrostatic equipment 4, and a third valve of the three-way reversing valve 5 controls the vertical pipe type electrostatic equipment 4 to be closed.
Specifically, the three-way reversing valve 5 is controlled by a program to switch valves, so that three states of working, cleaning and closing and draining of the vertical pipe type electrostatic equipment 4 are respectively controlled, and the three states are circularly reciprocated. In addition, according to different waste gas conditions and treatment effects, the number of the cylinder electric field in the working state, the cylinder electric field in the cleaning state and the cylinder electric field in the draining state in the vertical pipe type electrostatic equipment 4 are adjusted through programs, and the vertical pipe type electrostatic equipment 4 does not need to be stopped for cleaning through switching of the three working states of the cylinder electric field 45, so that online cleaning of the equipment is realized, maintenance cost is reduced, and manual cleaning amount is greatly reduced.
Specifically, through the switching of the three-way reversing valve 5, 235 electric fields are in a working state during working, at least 20 electric fields are in a cleaning state, at least 50 electric fields are in a closing state, and the cylindrical electric field 45 in the closing state naturally drains water on the pipe wall under the action of gravity.
More specifically, the number of the 305 cylindrical electric fields 45 in the vertical tubular electrostatic device 4 is from 1 to 305, the 1 st to 235 th cylindrical electric fields are in the working state when the vertical tubular electrostatic device is started, the 236 th and 285 th cylindrical electric fields are in the draining and closing state, and the 286 th and 305 th cylindrical electric fields are in the cleaning state; the switching principle is that once switching is carried out for 1 hour, 10 switches are carried out each time according to the state sequence of working, cleaning, closing and working;
specifically, the first handover (1H): no. 1-10 are in a cleaning state, No. 11-245 are in a working state, No. 246-295 are in a draining off state, and No. 296-305 are in a cleaning state;
second switch (2H): no. 1-20 is in a cleaning state, No. 21-265 is in an operating state, and No. 266-305 is in a draining closing state;
third switching (3H): no. 1-10 is in a closed state, No. 11-30 is in a cleaning state, No. 31-275 is in a working state, and No. 276-305 is in a draining closed state.
Through sewage separation device 3 sets up particulate matter and the oil smoke in oil water separator 31 and the sedimentation tank 32 processing sewage, sedimentation tank 32 is located the below of 3 imports 33 of sewage separation device, oil water separator 31 set up in one side of sedimentation tank 32.
Specifically, an inclined plate and a sludge discharge port are arranged at the bottom of the sedimentation tank 3, the inclined plate is obliquely arranged inside the sedimentation tank 32, particulate matters in the sewage are firstly separated and precipitated through the inclined plate, and are precipitated to the bottom of the sedimentation tank 32 in a sludge form and then flow out from the sludge discharge port.
Specifically, oil smoke in the sewage flows into the oil-water separator 31 in the form of floating oil for separation, the floating oil is discharged from the upper layer of the oil-water separator 31, and clear water obtained by separating the particulate matters and the oil smoke from the sewage returns to the contraction pipe 11 in the wet venturi scrubber 1 and is continuously used as spray water in the atomizing nozzle, so that the water is recycled.
Specifically, the gas-water separator 2 is a rectangle with an interface of 2500 × 2500 MM.
A high-concentration oil smoke and particulate matter waste gas treatment method based on the high-concentration oil smoke and particulate matter waste gas treatment device comprises the following steps:
(1) the waste gas is pretreated by a wet venturi dust collector: an atomizing nozzle at the contraction pipe of the wet Venturi dust collector sprays water mist into the contraction pipe, and oil smoke, particulate matters and atomized water drops in the waste gas are contacted with each other to finish the capture process;
(2) the pretreated waste gas and the sewage with oil smoke, particles and atomized water drops enter a gas-water separator for preliminary purification: waste gas is separated from a large amount of water containing oil smoke and particles, sewage is discharged into a sewage separation device from an outlet of the gas-water separator, and the waste gas enters vertical pipe type electrostatic equipment from an exhaust gas outlet of the gas-water separator 2 for deep purification;
(3) the sewage in the step (2) firstly enters a sedimentation tank in a sewage separation device to separate and precipitate particulate matters through an inclined plate, the particulate matters are precipitated in a sludge form and discharged from a sludge discharge port of the sedimentation tank, then enter an oil-water separator to separate oil smoke and water, the oil smoke is discharged from the upper layer of the oil-water separator in a floating oil form, and the separated water is circulated back to a contraction pipe of the wet type Venturi dust collector to be used as spray water of an atomizing nozzle;
(4) enabling the waste gas in the step (2) to enter vertical pipe type electrostatic equipment through a program control three-way reversing valve, enabling the vertical pipe type electrostatic equipment to start working, enabling residual particulate matters and oil smoke in the waste gas to move to a dust collecting electrode under the action of a cylindrical electric field and be adsorbed on the dust collecting electrode, and enabling high-pressure cleaning water to wash the pipe wall of the vertical pipe type electrostatic equipment through the program control three-way reversing valve;
(5) switching the cylindrical electric fields in the step (4) by 10 pieces at a time according to the state sequence of working, cleaning, closing and working every hour, wherein 235 cylindrical electric fields are in a working state, at least 20 cylindrical electric fields are in a cleaning state, and at least 50 cylindrical electric fields are in a closing state;
(6) the waste gas in the step (2) is deeply purified by the vertical pipe type electrostatic equipment and then is released from a bottom waste gas discharge port, and the washed particulate matters, the oil smoke and the washing water flow into a sewage separation device from a bottom outlet of the vertical pipe type electrostatic equipment to be treated in the step (3);
(7) after the deep purification of the waste gas is finished, the three-way reversing valve is controlled by a program to close the operation of the vertical pipe type electrostatic equipment;
(8) naturally draining water on the pipe wall of the closed vertical pipe type electrostatic equipment, and enabling the drained water to flow into the sewage separation device from the bottom outlet of the vertical pipe type electrostatic equipment for the treatment in the step (3);
specifically, according to different waste gas conditions and treatment effects, the number of cylinders in a working state, cylinders in a cleaning state and cylinders in a closed draining state is adjusted by modifying program parameters, so that different waste gas treatment is realized.
Example (b): the waste gas generated in the production process of removing components of a certain waste circuit board has the air volume of about 40000m3The temperature of the flue gas is 40 ℃, and the content of the particulate matters is 90mg/m3The oil smoke content is about 650mg/m3The above processing apparatus and processing method are employed.
Specifically, the concentration of the oil smoke in the waste gas subjected to the primary purification treatment in the step (2) is reduced to 250mg/m3The concentration of the particles is 45mg/m3。
Specifically, the concentration of the oil smoke in the waste gas subjected to the deep purification treatment in the step (4) is reduced to 5mg/m3The concentration of the particles is reduced to 2mg/m3。
The wind speed of the waste gas passing through a smoke exhaust pipeline of 1000MM is 14.15m/s, after the waste gas enters the wet type Venturi dust collector 1, the wind speed is changed into 87.58m/s, and the pipe diameter of an inlet of the wet type Venturi dust collector 1 is 1000 MM. Waste gas process wet-type venturi scrubber 1's shrink tube 11 department, atomizing nozzle is towards the spray of water in the shrink tube 11, and at shrink tube 11 department, oil smoke, dust and the atomizing water droplet in the waste gas contact each other, accomplishes the seizure process, and the sudden narrowing of pipeline makes the gaseous phase form the negative pressure, and gaseous phase negative pressure makes the liquid phase form the water film, through this kind of mode, makes the gas-liquid mixture contact, shrink tube 11's minimum pipe diameter is 400MM, can not have the possibility of blockking up the pipeline.
When waste gas enters the gas-water separator 2 from the expansion pipe of the wet venturi scrubber 1, the sectional area of the gas-water separator is 6.25 square meters, the wind speed is reduced to 1.76m/s, the waste gas is separated from water which captures a large amount of oil stain and dust, sewage carrying particulate matters and oil smoke flows into the sewage separation device after being collected from the bottom of the gas-water separator 2, the waste gas enters the vertical pipe type electrostatic equipment 4 from the waste gas outlet end of the gas-water separator 2 for continuous purification, and the oil smoke concentration is reduced to about 250mg/m through the treatment of the gas-water separator 23The concentration of the particles is reduced by 45mg/m3The exhaust gas is primarily purified.
The waste gas passes through the vertical pipe type static electricityAfter the treatment of the equipment 4, the concentration of the oil smoke in the waste gas is reduced to 5mg/m3The concentration of the particles is reduced to 2mg/m3. After the cleaning water, the draining water and the oil smoke and the particulate matters in the cylindrical electric field flow into the bottom of the equipment, the cleaning water, the draining water and the oil smoke and the particulate matters flow into the sewage separation device through the outlet of the vertical pipe type electrostatic equipment 4 to separate the particulate matters, the oil smoke and the water.
The working principle of the invention is as follows: the waste gas to be treated passes through a contraction pipe of a wet type Venturi dust collector to complete the capture process, the waste gas enters a gas-water separator for preliminary purification, the waste gas after preliminary separation enters vertical pipe type electrostatic equipment for deep purification, the vertical pipe type electrostatic equipment is controlled by a three-way reversing valve to realize the switching of 10 cylindrical electric fields per hour according to the sequence of work, cleaning, closing and work, and the cleaning without stopping the machine is completed; and the sewage with the oil smoke and the particles enters a sewage separation device to separate oil stain and the particles, meanwhile, the separated clear water returns to an atomizing nozzle at the position of the shrinkage pipe, and the flushing draining water on the pipe wall of the vertical pipe type electrostatic equipment circularly flows into the shrinkage pipe again to be recycled.
The main functions of the invention are as follows: the invention realizes the purification treatment of oil smoke and particles of waste gas by designing the wet venturi dust collector, the gas-water separator, the sewage separation device, the electrostatic equipment and the three-way reversing valve, greatly reduces the usage amount of water and the manual cleaning amount, realizes the recycling utilization of water, realizes the non-stop and on-line maintenance of the electrostatic equipment by a program and the three-way reversing valve, reduces the maintenance cost, can continuously clear oil stains and particles, has simple and convenient operation and convenient maintenance, is not easy to cause the problems of filler blockage and the like, and can be stably used for a long time.
In summary, after reading the present disclosure, those skilled in the art can make various other corresponding changes without creative mental labor according to the technical solutions and concepts of the present disclosure, and all of them are within the protection scope of the present disclosure.
Claims (8)
1. The utility model provides a processing apparatus of high concentration oil smoke and particulate matter waste gas, its characterized in that, includes riser formula electrostatic equipment, the inside a plurality of drum electric fields that are equipped with of riser formula electrostatic equipment, the centre in drum electric field is equipped with the needle discharge electrode, the pipe wall of riser formula electrostatic equipment is equipped with the utmost point of gathering dust, drum electric field top is provided with the tee bend switching-over valve, the tee bend switching-over valve passes through program control, the waste gas inlet of riser formula electrostatic equipment and gas-water separator's exhaust outlet are connected, the export of riser formula electrostatic equipment is connected with sewage separation plant's import department.
2. The device for treating high concentration oil smoke and particulate matter waste gas according to claim 1, further comprising a wet venturi scrubber, wherein the wet venturi scrubber comprises a contraction pipe, a throat pipe and a diffusion pipe, the contraction pipe is provided with an atomizing nozzle, the diffusion pipe end of the wet venturi scrubber is connected with the inlet of the gas-water separator, the outlet of the gas-water separator is connected with the inlet of the sewage separation device, and the water outlet of the sewage separation device is connected with the contraction pipe of the wet venturi scrubber.
3. The apparatus of claim 1, wherein a first valve of the three-way reversing valve is connected to the waste gas inlet of the vertical electrostatic device, a second valve of the three-way reversing valve is connected to the wash water inlet of the vertical electrostatic device, and a third valve of the three-way reversing valve controls the closing of the vertical electrostatic device.
4. The apparatus of claim 1, wherein the plurality of cylinder fields comprises a working cylinder field, a cleaning cylinder field, and a shut-down draining cylinder field.
5. The apparatus of claim 1, wherein the wastewater separation device comprises an oil-water separator and a sedimentation tank, and the sedimentation tank is located below the inlet of the wastewater separation device.
6. The apparatus for treating high concentration oil smoke and particulate matter waste gas as claimed in claim 4, wherein the sedimentation tank is provided with an inclined plate and the bottom is provided with a sludge discharge outlet.
7. The apparatus of claim 1, wherein the outlet of the bottom of the vertical tubular electrostatic device is connected to the inlet of the sewage separation device.
8. The method for treating high concentration oil smoke and particulate matter exhaust gas according to any one of the treatment devices of claims 1 to 7, characterized by comprising the steps of:
(1) the waste gas is pretreated by a wet venturi dust collector: an atomizing nozzle at the contraction pipe of the wet Venturi dust collector sprays water mist into the contraction pipe, and oil smoke, particulate matters and atomized water drops in the waste gas are contacted with each other to finish the capture process;
(2) the pretreated waste gas and the sewage with oil smoke, particles and atomized water drops enter a gas-water separator for preliminary purification: waste gas is separated from a large amount of water containing oil smoke and particles, sewage is discharged into a sewage separation device from an outlet of a gas-water separator, and the waste gas enters vertical pipe type electrostatic equipment from an exhaust gas outlet of the gas-water separator for deep purification;
(3) the sewage in the step (2) firstly enters a sedimentation tank in a sewage separation device to separate and precipitate particulate matters through an inclined plate, the particulate matters are precipitated in a sludge form and discharged from a sludge discharge port of the sedimentation tank, the sewage enters an oil-water separator to separate oil smoke and water, the oil smoke is discharged from the upper layer of the oil-water separator in a floating oil form, and the separated water is circulated back to a contraction pipe of the wet venturi dust collector to be used as spray water of an atomizing nozzle;
(4) enabling the waste gas in the step (2) to enter vertical pipe type electrostatic equipment through a program control three-way reversing valve, enabling the vertical pipe type electrostatic equipment to start working, enabling residual particulate matters and oil smoke in the waste gas to move to a dust collecting electrode under the action of a cylindrical electric field and be adsorbed on the dust collecting electrode, and enabling high-pressure cleaning water to wash the pipe wall of the vertical pipe type electrostatic equipment through the program control three-way reversing valve;
(5) switching the cylindrical electric fields in the step (4) by 10 pieces at a time according to the state sequence of working, cleaning, closing and working every hour, wherein 235 cylindrical electric fields are in a working state, at least 20 cylindrical electric fields are in a cleaning state, and at least 50 cylindrical electric fields are in a closing state;
(6) the waste gas in the step (2) is deeply purified by the vertical pipe type electrostatic equipment and then is released from a bottom waste gas discharge port, and the washed particulate matters, the oil smoke and the washing water flow into a sewage separation device from a bottom outlet of the vertical pipe type electrostatic equipment to be treated in the step (3);
(7) after the deep purification of the waste gas is finished, the three-way reversing valve is controlled by a program to close the operation of the vertical pipe type electrostatic equipment;
(8) and (4) naturally draining water on the pipe wall of the closed vertical pipe type electrostatic equipment, and enabling the drained water to flow into the sewage separation device from the bottom outlet of the vertical pipe type electrostatic equipment for the treatment in the step (3).
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