CN110327759B - Waste gas treatment system - Google Patents
Waste gas treatment system Download PDFInfo
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- CN110327759B CN110327759B CN201910681349.9A CN201910681349A CN110327759B CN 110327759 B CN110327759 B CN 110327759B CN 201910681349 A CN201910681349 A CN 201910681349A CN 110327759 B CN110327759 B CN 110327759B
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- 239000002912 waste gas Substances 0.000 title claims abstract description 83
- 238000001816 cooling Methods 0.000 claims abstract description 127
- 238000000926 separation method Methods 0.000 claims abstract description 94
- 230000003197 catalytic effect Effects 0.000 claims abstract description 93
- 238000005336 cracking Methods 0.000 claims abstract description 82
- 239000007789 gas Substances 0.000 claims abstract description 45
- 238000007539 photo-oxidation reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 239000010865 sewage Substances 0.000 claims description 46
- 230000002265 prevention Effects 0.000 claims description 28
- 238000004062 sedimentation Methods 0.000 claims description 23
- 239000000725 suspension Substances 0.000 claims description 23
- 238000000197 pyrolysis Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 7
- 230000006378 damage Effects 0.000 abstract description 5
- 239000012855 volatile organic compound Substances 0.000 description 46
- 239000000498 cooling water Substances 0.000 description 30
- 239000000428 dust Substances 0.000 description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 9
- 150000001412 amines Chemical class 0.000 description 9
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- -1 cooling is even Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/12—Washers with plural different washing sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/869—Multiple step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides an exhaust gas treatment system, which is provided with high-temperature exhaust gas treatment equipment and normal-temperature exhaust gas treatment equipment, wherein the high-temperature exhaust gas reaches the emission standard after being treated by a first-stage cooling oil stain separation tower, a first-stage cracking catalytic tower, a third-stage cooling oil stain separation tower and a third-stage cracking catalytic tower in a combined way, and the normal-temperature exhaust gas reaches the emission standard after being treated by a fourth-stage cracking catalytic oil stain separation tower, a fourth-stage cooling oil stain separation tower, a fifth-stage cracking catalytic tower and a plasma UV photooxidation exhaust gas treatment machine in a combined way; the treated waste gas is discharged to the atmosphere without causing harm to the environment and human body, solves the technical problem that the existing waste gas is directly discharged without reaching standards, and can be widely applied to the field of waste gas treatment.
Description
Technical Field
The invention relates to environment-friendly equipment, in particular to an exhaust gas treatment system.
Background
With the development of economy and society, environmental pollution is more and more serious, and especially in the field of waste gas treatment. In the granulation process of the plastic paper cleaned by old agricultural films and paper factories, as the high polymer materials are heated, melted or polymerized, partial high polymer, auxiliary agents and other components are cracked or oxidatively decomposed to generate amine, hydrogen sulfide, aromatic and hydrocarbon and other VOC pollutants, the VOC pollutants volatilize and spread out, and a large amount of greasy dirt, dust and moisture are carried out, and the VOC pollutants are discharged outdoors through mechanical exhaust, so that the surrounding ecological environment is seriously polluted. After being discharged, the substances have great influence on the quality of air, and direct contact can cause harm to human health, so that equipment is needed to effectively treat waste gas, and the emission standard is reached, and the influence on the environment and human body is avoided.
Disclosure of Invention
The invention aims to solve the defects of the technology and provide an exhaust gas treatment system for effectively removing volatile organic compounds such as dust, greasy dirt, amine, hydrogen sulfide, VOC and the like.
The invention provides an exhaust gas treatment system, which comprises high-temperature exhaust gas treatment equipment and normal-temperature exhaust gas treatment equipment, wherein the high-temperature exhaust gas treatment equipment comprises a first airtight gas collecting hood, a water return prevention device box, a first-stage cooling oil stain separation tower, a first-stage cracking catalytic tower, a third-stage cooling oil stain separation tower, a third-stage cracking catalytic tower, a sewage conveying pipeline and a vertical flow sedimentation suspension pond; the first airtight gas-collecting hood is communicated and connected with the water return prevention device box through a pipeline, the water return prevention device box is communicated and connected with the first-stage cooling oil stain separation tower through a pipeline, the first-stage cooling oil stain separation tower is communicated and connected with the first-stage cracking catalyst tower through a pipeline, the first-stage cracking catalyst tower is communicated and connected with the third-stage cooling oil stain separation tower through a pipeline, the third-stage cooling oil stain separation tower is communicated and connected with the third-stage cracking catalyst tower through a pipeline, and the top of the third-stage cracking catalyst tower is communicated and provided with a first exhaust port; the third-stage cooling oil stain separating tower is communicated with a first water inlet pipe, and is communicated with the first-stage cooling oil stain separating tower through a first communication pipe; the bottoms of the first-stage cooling oil stain separation tower, the first-stage cracking catalytic tower, the third-stage cooling oil stain separation tower and the third-stage cracking catalytic tower are respectively communicated and connected with a sewage conveying pipeline through a sewage discharging pipe, and the sewage conveying pipeline is communicated with a vertical flow sedimentation suspension pond;
the normal-temperature waste gas treatment device comprises a second closed gas collecting hood, a four-stage cracking catalytic oil stain separation tower, a four-stage cooling oil stain separation tower, a five-stage cracking catalytic tower and a plasma UV photooxidation waste gas treatment machine; the second airtight gas-collecting hood is communicated and connected with a four-stage cracking catalytic oil stain separation tower through a pipeline, the four-stage cracking catalytic oil stain separation tower is communicated and connected with a four-stage cooling oil stain separation tower through a pipeline, the four-stage cooling oil stain separation tower is communicated and connected with a five-stage cracking catalytic tower through a pipeline, the five-stage cracking catalytic tower is communicated and connected with a plasma UV photooxidation waste gas treatment machine through a pipeline, and the top of the plasma UV photooxidation waste gas treatment machine is communicated and provided with a second exhaust port; the fourth-stage cooling oil stain separating tower is communicated with a second water inlet pipe, and is communicated with the fourth-stage cracking catalytic oil stain separating tower through a second communicating pipe; the bottoms of the four-stage cracking catalytic oil stain separating tower, the four-stage cooling oil stain separating tower and the five-stage cracking catalytic tower are respectively communicated and connected with a sewage conveying pipeline through a sewage discharge pipe.
Preferably, a pipeline between the water return prevention device box and the first-stage cooling oil stain separation tower extends into the first-stage cooling oil stain separation tower; and a blow-off pipe communicated with the first-stage cooling oil stain separation tower extends into the first-stage cooling oil stain separation tower.
Preferably, a plurality of air inlets are arranged at the tail end of the pipeline extending into the first-stage cooling oil stain separation tower.
Preferably, the first-stage cracking catalytic tower, the third-stage cracking catalytic tower and the fifth-stage cracking catalytic tower are respectively provided with steel wire balls.
Preferably, a plurality of water vapor mixing pipes are vertically arranged in the three-stage cooling oil stain separating tower, the four-stage cooling oil stain separating tower and the four-stage cracking catalytic oil stain separating tower.
Preferably, a steel wire ball is arranged below the water vapor mixing pipe in the four-stage pyrolysis catalytic oil stain separation tower.
Preferably, a spray nozzle is arranged in a connecting pipeline between the water return prevention device box and the primary cooling oil stain separation tower.
Preferably, the bottom of the water return prevention device box is communicated and connected with a drain pipe connected with the primary cooling oil stain separation tower through a water return prevention device drain pipe.
Preferably, the top of the first-stage cooling oil stain separation tower is also communicated with a vent pipe, the vent pipe is communicated with a connecting pipeline between the water return prevention device box and the first-stage cooling oil stain separation tower, and the vent pipe is communicated with a one-way valve.
Preferably, exhaust fans are arranged in the first airtight gas collecting hood, the second airtight gas collecting hood and the second exhaust port.
The invention provides an exhaust gas treatment system, which has the following beneficial effects:
the invention has the advantages that the device is provided with a water return prevention device box, a first-stage cooling oil stain separating tower, a first-stage cracking catalytic tower, a third-stage cooling oil stain separating tower and a third-stage cracking catalytic tower, a fourth-stage cracking catalytic oil stain separating tower, a fourth-stage cooling oil stain separating tower, a fifth-stage cracking catalytic tower, a plasma UV photooxidation waste gas processor, a sewage conveying pipeline and a vertical flow sedimentation suspension tank, high-temperature waste gas is treated by cooling water in the first-stage cooling oil stain separating tower, pollutants enter the cooling water and are discharged along with the cooling water, the cooling water is heated under the action of the high-temperature waste gas to further decompose and separate the waste gas, most dust, oil stains, amine, hydrogen sulfide and VOC volatile organic matters are removed, and the waste gas is scraped by steel wire balls in the first-stage cracking catalytic tower to remove the residual oil stains and VOC volatile organic matters, and is further treated by the third-stage cooling oil stain separating tower and the third-stage cracking catalytic tower, so as to reach the emission standard; the low-temperature waste gas is subjected to the simultaneous action of cooling water and steel wire balls in the four-stage pyrolysis catalytic oil stain separation tower to remove most of dust, oil stains, amine, hydrogen sulfide and VOC volatile organic compounds in the waste gas, and is further treated by the combination of the four-stage pyrolysis oil stain separation tower, the five-stage pyrolysis catalytic tower and the plasma UV photooxidation waste gas treatment machine, so that the waste gas reaches the emission standard and does not cause harm to the environment and human bodies;
the exhaust gas treatment system is simple in structure, convenient and safe to maintain, high in exhaust gas treatment efficiency, capable of effectively guaranteeing the purification effect of exhaust gas and free of secondary pollution; the main dust, greasy dirt, amine, hydrogen sulfide and VOC volatile organic compounds in the waste gas are effectively treated under the action of cooling water and steel wire balls, the content of the VOC volatile organic compounds can be reduced to below 20ppm from 500 ppm before, the emission standard is reached, and the damage to the environment and human body is avoided.
The water return prevention device box and the vent pipe are arranged to effectively prevent a large amount of cooling water from flowing back into the first airtight gas collecting hood, so that equipment faults are caused.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a processing effect diagram of the present invention.
The marks in the figure: 1. a first airtight gas-collecting hood, a water return prevention device box, a first-stage cooling oil stain separating tower, a first-stage cracking catalytic tower, a third-stage cooling oil stain separating tower, a third-stage cracking catalytic tower, a vertical flow sedimentation suspension tank, a second airtight gas collecting hood, a fourth-level cracking catalytic oil stain separating tower, a fourth-level cooling oil stain separating tower, a fifth-level cracking catalytic tower, a plasma UV photooxidation waste gas processor, the device comprises a first air outlet, a second air outlet, a spray nozzle, a water vapor mixing pipe, a wire ball, a water return preventing device drain pipe, a sewage conveying pipeline, a suction fan, a pipeline, a blow-down pipe, a ventilating pipe, a one-way valve, a 25 air inlet, a 26 sewage discharging main pipe, a 27 first water inlet pipe, a 28 second water inlet pipe, a 29 first communicating pipe and a 30 second communicating pipe.
The direction indicated by the arrow in fig. 1 is the flow direction of the exhaust gas;
the direction indicated by the arrows in fig. 2 is the direction of water flow and dirt flow.
Detailed Description
The invention will be further described with reference to the drawings and specific examples to aid in understanding the context of the invention. The method used in the invention is a conventional method unless specified otherwise; the raw materials and devices used, unless otherwise specified, are all conventional commercial products.
As shown in fig. 1 and 2, the present invention provides an exhaust gas treatment system, which includes a high-temperature exhaust gas treatment device and a normal-temperature exhaust gas treatment device, wherein the high-temperature exhaust gas treatment device is mainly used for treating high-temperature exhaust gas of 50-180 ℃, and the normal-temperature exhaust gas treatment device is mainly used for treating exhaust gas of below 50 ℃. The high-temperature waste gas treatment equipment comprises a first airtight gas collecting hood 1, a water return prevention device box 2, a first-stage cooling oil stain separation tower 3, a first-stage cracking catalytic tower 4, a third-stage cooling oil stain separation tower 5, a third-stage cracking catalytic tower 6, a sewage conveying pipeline 19 and a vertical flow sedimentation suspension pond 7.
Be equipped with air exhauster 20 in the first airtight gas-collecting channel 1 and be used for collecting high temperature waste gas fast, first airtight gas-collecting channel 1 is connected with the upper portion intercommunication of preventing returning water device case 2 through pipeline 21, and the upper portion of preventing returning water device case 2 still is connected with the top intercommunication of one-level cooling greasy dirt knockout drum 3 through pipeline 21, and pipeline 21 extends to in the one-level cooling greasy dirt knockout drum 3 tower, when the cooling water is full of in the one-level cooling greasy dirt knockout drum 3 tower, the end of pipeline 21 inserts below the cooling water liquid level. The tail end of the pipeline 21 extending into the first-stage cooling oil stain separating tower 3 is connected with a plurality of convex air inlets 25, so that the waste gas to be treated is fully contacted with cooling water to be purified. A spray nozzle 15 is arranged in a connecting pipeline 21 between the water return prevention device box 2 and the first-stage cooling oil stain separation tower 3, the spray nozzle 15 is connected with an external water source to spray water for cooling and dedusting waste gas in the pipeline 21, and dirt after waste gas treatment enters the first-stage cooling oil stain separation tower 3 along with water flow. The waste gas enters a first-stage cooling oil stain separating tower 3 to be cooled and acted with water, so that most of dust, oil stains, amine, hydrogen sulfide and VOC volatile organic compounds are removed.
The upper part of the primary cooling oil stain separation tower 3 is communicated and connected with the lower part of the primary cracking catalytic tower 4 through a pipeline 21, and a steel wire ball 17 is arranged in the primary cracking catalytic tower 4. When the waste gas passes through the steel wire balls 17 in the primary cracking catalytic tower 4, oil stains and VOC volatile organic compounds in the waste gas are further removed.
The upper portion of the first-stage pyrolysis catalytic tower 4 is communicated and connected with the lower portion of the three-stage cooling oil stain separation tower 5 through a pipeline 21, a plurality of water vapor mixing pipes 16 are vertically arranged in the three-stage cooling oil stain separation tower 5, the water vapor mixing pipes 16 are fixedly connected with the inner wall of the three-stage cooling oil stain separation tower 5 through auxiliary connecting pieces, the arrangement of the water vapor mixing pipes 16 is convenient for waste gas to disperse through cooling water, cooling is even, and oil stains and VOC volatile organic compounds are further fully removed.
The upper part of the three-stage cooling oil stain separation tower 5 is communicated and connected with the lower part of the three-stage cracking catalytic tower 6 through a pipeline 21, and a steel wire ball 17 is also arranged in the three-stage cracking catalytic tower 6, so that the residual oil stains and VOC volatile organic compounds in the waste gas are purified and removed again. The top of the three-stage pyrolysis catalytic tower 6 is communicated with a first exhaust port 13, and the high-temperature waste gas is discharged into the atmosphere through the first exhaust port 13 after reaching the standard.
The lower part of the three-stage cooling oil stain separating tower 5 is communicated with a first water inlet pipe 27, the upper part of the three-stage cooling oil stain separating tower 5 is communicated and connected with the lower part of the one-stage cooling oil stain separating tower 3 through a first communication pipe 29, and the first communication pipe 29 is arranged below a pipeline 21 between the three-stage cooling oil stain separating tower 5 and the three-stage cracking catalytic tower 6. The external water source enters the three-stage cooling oil stain separation tower 5 through the first water inlet pipe 27, so that the cooling water in the three-stage cooling oil stain separation tower 5 is ensured to be sufficient, the cooling water can be continuously supplemented into the first-stage cooling oil stain separation tower 3 through the arrangement of the first communication pipe 29, the cooling water is kept continuously updated, and the oil stains are taken away.
The bottoms of the first-stage cooling oil stain separating tower 3, the first-stage cracking catalytic tower 4, the third-stage cooling oil stain separating tower 5 and the third-stage cracking catalytic tower 6 are respectively communicated and connected with a sewage conveying pipeline 19 through a drain pipe 22, and the sewage conveying pipeline 19 is communicated with the vertical flow sedimentation suspension pond 7. The sewage pipe 22 communicated with the first-stage cooling oil stain separating tower 3 extends to the liquid level of cooling water in the first-stage cooling oil stain separating tower 3, and oil stains in the first-stage cooling oil stain separating tower 3 enter the sewage conveying pipeline 19 along the sewage pipe 22 along with continuous updating of the cooling water and then flow into the vertical flow sedimentation suspension pond 7 for treatment.
The normal temperature waste gas treatment device comprises a second closed gas collecting hood 8, a four-stage cracking catalytic oil stain separation tower 9, a four-stage cooling oil stain separation tower 10, a five-stage cracking catalytic tower 11 and a plasma UV photooxidation waste gas treatment machine 12.
An exhaust fan 20 is also arranged in the second airtight gas-collecting hood 8 and used for rapidly collecting normal-temperature waste gas, the second airtight gas-collecting hood 8 is communicated and connected with the top of the four-stage pyrolysis catalytic oil stain separation tower 9 through a pipeline 21, a plurality of water vapor mixing pipes 16 are also vertically arranged in the four-stage pyrolysis catalytic oil stain separation tower 9, and the water vapor mixing pipes 16 are fixedly connected with the inner wall of the four-stage pyrolysis catalytic oil stain separation tower 9 through auxiliary connecting pieces; and a steel wire ball 17 is arranged below the water-vapor mixing pipe 16 and is used for removing greasy dirt and VOC volatile organic compounds from the normal-temperature waste gas.
The lower part of the four-stage pyrolysis catalytic oil stain separation tower 9 is communicated and connected with the upper part of the four-stage cooling oil stain separation tower 10 through a pipeline 21, a plurality of water vapor mixing pipes 16 are also vertically arranged in the four-stage cooling oil stain separation tower 10, the water vapor mixing pipes 16 are fixedly connected with the inner wall of the four-stage cooling oil stain separation tower 10 through auxiliary connecting pieces, so that normal-temperature waste gas is conveniently dispersed through cooling water, and the cooling is uniform, and further oil stains and VOC volatile organic compounds are fully removed.
The lower part of the four-stage cooling oil stain separation tower 10 is communicated and connected with the upper part of the five-stage cracking catalytic tower 11 through a pipeline 21, steel wire balls 17 are also arranged in the five-stage cracking catalytic tower 11, and the normal-temperature waste gas passes through the five-stage cracking catalytic tower 11 to further remove oil stains and VOC volatile organic matters.
The lower part of the five-stage pyrolysis catalytic tower 11 is communicated and connected with the lower part of the plasma UV photooxidation waste gas treatment machine 12 through a pipeline 21, the top of the plasma UV photooxidation waste gas treatment machine 12 is communicated and provided with a second exhaust port 14, an exhaust fan 20 is arranged in the second exhaust port 14, so that waste gas can flow in the pipeline 21 quickly, and normal-temperature waste gas treatment reaches the standard and is discharged into the atmosphere through the second exhaust port 14.
The lower part of the four-stage cooling oil stain separating tower 10 is communicated with a second water inlet pipe 28, the upper part of the four-stage cooling oil stain separating tower 10 is communicated and connected with the upper part of the four-stage cracking catalytic oil stain separating tower 9 through a second communicating pipe 30, and the second communicating pipe 30 is arranged below a pipeline 21 between the four-stage cracking catalytic oil stain separating tower 9 and the four-stage cooling oil stain separating tower 10. The external water source enters the four-stage cooling oil stain separating tower 10 through the second water inlet pipe 28, so that the sufficient cooling water in the four-stage cooling oil stain separating tower 10 is ensured, and the cooling water in the four-stage cracking catalytic oil stain separating tower 9 can be continuously updated and flushed through the second water inlet pipe 30, so that oil stains and VOC volatile organic matters in waste gas are taken away, and the waste gas is purified.
The bottoms of the four-stage cracking catalytic oil stain separating tower 9, the four-stage cooling oil stain separating tower 10 and the five-stage cracking catalytic tower 11 are also respectively communicated and connected with a sewage conveying pipeline 19 through a drain pipe 22, and the sewage conveying pipeline 19 is communicated with the vertical flow sedimentation suspension tank 7. The oil stain and VOC volatile organic compounds after the waste gas treatment flow to the vertical flow sedimentation suspension tank 7 for treatment along the sewage discharge pipe 22 and the sewage conveying pipeline 19.
The top of the first-stage cooling oil stain separating tower 3 is also communicated with a vent pipe 23, the vent pipe 23 is communicated with a connecting pipeline 21 between the water return preventing device box 2 and the first-stage cooling oil stain separating tower 3, a one-way valve 24 is communicated with the vent pipe 23, and waste gas in the vent pipe 23 can only circulate from bottom to top.
The bottom of the water return prevention device box 2 is communicated and connected with a drain pipe 22 connected with the primary cooling oil stain separation tower 3 through a water return prevention device drain pipe 18. When the whole set of equipment operates, instantaneous negative pressure can occur in the first airtight gas collecting hood 1, water in the first-stage cooling oil stain separation tower 3 can flow back, and if the water return prevention device box 2 is not arranged, the returned water can directly enter the first airtight gas collecting hood 1 and production equipment to cause faults. The arrangement of the vent pipe 23 can enable the waste gas in the first-stage cooling oil stain separation tower 3 to enter the water return prevention device box 2 along the vent pipe 23, so that the return water caused by negative pressure is reduced. The water return prevention device drain pipe 18 is arranged to enable the return water in the water return prevention device box 2 to enter the sewage conveying pipeline 19 along the water return prevention device drain pipe 18 for drainage.
The working principle of the invention is as follows:
the equipment is opened, external water source gets into tertiary cooling greasy dirt separator 5 and four-stage cooling greasy dirt separator 10 respectively through first inlet tube 27 and second inlet tube 28, and the setting of first communicating pipe 29 and second communicating pipe 30 makes cooling water also be full of in the one-stage cooling greasy dirt separator 3 and the four-stage schizolysis catalytic greasy dirt separator 9, and water vapor mixing pipe 16 is also full of by water, and because the communicating vessel principle, the liquid level of each jar is level. Meanwhile, the liquid surfaces in the three-stage cooling oil stain separating tower 5, the four-stage cooling oil stain separating tower 10, the one-stage cooling oil stain separating tower 3 and the four-stage cracking catalytic oil stain separating tower 9 are level with the liquid surface in the vertical flow sedimentation suspension tank 7. The pipeline 21 extending into the first-stage cooling oil stain separation tower 3 is inserted below the liquid level; the pipe orifice of a blow-down pipe 22 extending into the first-stage cooling greasy dirt separating tower 3 is positioned at the liquid level; the pipe orifice of the sewage conveying pipeline 19 extending into the vertical sedimentation suspension tank 7 is positioned above the liquid level in the vertical sedimentation suspension tank 7 and is positioned on the same horizontal plane with the sewage discharging main pipe 26 which is arranged on one side of the vertical sedimentation suspension tank 7 and is communicated with the sewage discharging main pipe to prevent sewage from flowing backwards.
The high-temperature waste gas is collected through the first airtight gas collecting hood 1, enters the pipeline 21, is primarily cooled by cooling water sprayed out through the spray nozzle 15, enters the cooling water in the first-stage cooling oil stain separation tower 3 after dust removal, is heated under the action of the high-temperature waste gas in the first-stage cooling oil stain separation tower 3, is further cooled, decomposed and separated, harmful substances in the waste gas enter the cooling water, and flows into the vertical flow sedimentation suspension pond 7 through the sewage pipes 22 and the sewage conveying pipeline 19 under the continuous updating of the cooling water, and most of dust, oil stains, amine, hydrogen sulfide, VOC and other harmful substances can be removed after the waste gas is treated by the first-stage cooling oil stain separation tower 3.
The high-temperature waste gas enters the first-stage cracking catalytic tower 4 after being primarily cooled and purified by the first-stage cooling oil stain separating tower 3, oil stains and VOC volatile organic compounds in the waste gas are further scraped and removed after the waste gas passes through the steel wire balls 17 in the first-stage cracking catalytic tower 4, and the waste gas flows into the vertical flow sedimentation suspension tank 7 through the sewage discharge pipe 22 and the sewage conveying pipeline 19.
The waste gas is discharged from the first-stage pyrolysis catalytic tower 4 and then enters the third-stage cooling oil stain separation tower 5, the waste gas is cooled and separated by cooling water, and the waste gas flows into the vertical flow sedimentation suspension tank 7 through the sewage discharge pipe 22 and the sewage conveying pipeline 19.
The waste gas comes out of the three-stage cooling oil stain separation tower 5 and then enters the three-stage cracking catalytic tower 6, oil stains and VOC volatile organic compounds are further removed through the steel wire balls 17, and the waste gas is discharged into the atmosphere through the first exhaust port 13 after reaching the treatment standard. The oil stain and VOC volatile organic compounds flow into the vertical flow sedimentation suspension tank 7 through the drain pipe 22 and the sewage conveying pipeline 19.
The normal temperature waste gas is collected by the second airtight gas collecting hood 8, enters the four-stage pyrolysis catalysis oil stain separation tower 9 through the pipeline 21, is acted by cooling water and the steel wire balls 17, is cooled and dedusted, removes oil stains, amine, hydrogen sulfide and VOC volatile organic compounds, sewage flows into the vertical flow sedimentation suspension tank 7 along the sewage pipe 22 and the sewage conveying pipeline 19 under the update of the cooling water and the action of the exhaust fan 20 in the second exhaust port 14, and can remove most dust, oil stains, amine, hydrogen sulfide and VOC volatile organic compounds after the normal temperature waste gas is processed by the four-stage pyrolysis catalysis oil stain separation tower 9.
The waste gas enters the four-stage cooling oil stain separating tower 10 after exiting from the four-stage cracking catalytic oil stain separating tower 9, is cooled again by cooling water, removes oil stains and VOC volatile organic compounds, and the sewage flows into the vertical flow sedimentation suspension tank 7 along the sewage discharging pipe 22 and the sewage conveying pipeline 19.
The waste gas enters the five-stage pyrolysis catalytic tower 11 after exiting the four-stage cooling oil stain separation tower 10, oil stains and VOC volatile organic compounds are removed again through the steel wire balls 17, and the dirt flows into the vertical flow sedimentation suspension tank 7 along the sewage discharge pipe 22 and the sewage conveying pipeline 19.
The waste gas enters a plasma UV photo-oxygen waste gas treatment machine 12 after coming out of the five-stage pyrolysis catalytic tower 11, the waste gas is purified again, and the normal-temperature waste gas reaches the standard after being treated and is discharged into the atmosphere through a second exhaust port 14.
In the whole waste gas treatment process, cooling water is continuously supplemented into the three-stage cooling oil stain separating tower 5 and the four-stage cooling oil stain separating tower 10 through the first water inlet pipe 27 and the second water inlet pipe 28 respectively, and enters the first-stage cooling oil stain separating tower 3 and the four-stage cracking catalytic oil stain separating tower 9 through the first communication pipe 29 and the second communication pipe 30 respectively, and dirt is taken away along with updating of the cooling water and enters the vertical flow sedimentation suspension tank 7 along the sewage discharge pipe 22 and the sewage conveying pipeline 19.
The high-temperature exhaust gas treatment device and the normal-temperature exhaust gas treatment device may be used in combination or alone as needed. The waste gas is treated by the high-temperature waste gas treatment equipment and the normal-temperature waste gas treatment equipment, and then the waste gas is detected to hardly contain dust and greasy dirt at the first exhaust port 13 and the third exhaust port 14, so that the content of VOC volatile organic compounds can be reduced to below 20ppm from more than 500 ppm before, the emission standard is reached, and the harm to the atmosphere and human bodies can be avoided.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must be provided with specific orientations, be configured and operated in specific orientations, and thus are not to be construed as limiting the present invention.
However, the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention are intended to fall within the scope of the claims.
Claims (6)
1. The waste gas treatment system is characterized by comprising high-temperature waste gas treatment equipment and normal-temperature waste gas treatment equipment, wherein the high-temperature waste gas treatment equipment comprises a first airtight gas collecting hood, a water return prevention device box, a first-stage cooling oil stain separation tower, a first-stage cracking catalytic tower, a third-stage cooling oil stain separation tower, a third-stage cracking catalytic tower, a sewage conveying pipeline and a vertical flow sedimentation suspension pond; the first airtight gas-collecting hood is communicated and connected with the water return prevention device box through a pipeline, the water return prevention device box is communicated and connected with the first-stage cooling oil stain separation tower through a pipeline, a spray nozzle is arranged in a connecting pipeline between the water return prevention device box and the first-stage cooling oil stain separation tower, the first-stage cooling oil stain separation tower is communicated and connected with the first-stage cracking catalytic tower through a pipeline, the first-stage cracking catalytic tower is communicated and connected with the third-stage cooling oil stain separation tower through a pipeline, the third-stage cooling oil stain separation tower is communicated and connected with the third-stage cracking catalytic tower through a pipeline, and a first exhaust port is communicated and arranged at the top of the third-stage cracking catalytic tower; the third-stage cooling oil stain separation tower is communicated with the first water inlet pipe and is communicated with the first-stage cooling oil stain separation tower through a first communication pipe; the bottoms of the first-stage cooling oil stain separation tower, the first-stage cracking catalytic tower, the third-stage cooling oil stain separation tower and the third-stage cracking catalytic tower are respectively communicated and connected with the sewage conveying pipeline through a drain pipe, and the sewage conveying pipeline is communicated with the vertical flow sedimentation suspension tank;
the normal-temperature waste gas treatment equipment comprises a second airtight gas collecting hood, a four-stage cracking catalytic oil stain separation tower, a four-stage cooling oil stain separation tower, a five-stage cracking catalytic tower and a plasma UV photooxidation waste gas treatment machine; the second airtight gas collecting hood is communicated and connected with the four-stage cracking catalytic oil stain separation tower through a pipeline, the four-stage cracking catalytic oil stain separation tower is communicated and connected with the four-stage cooling oil stain separation tower through a pipeline, the four-stage cooling oil stain separation tower is communicated and connected with the five-stage cracking catalytic tower through a pipeline, the five-stage cracking catalytic tower is communicated and connected with the plasma UV photooxidation waste gas processor through a pipeline, and the top of the plasma UV photooxidation waste gas processor is communicated and provided with a second exhaust port; the four-stage cooling oil stain separation tower is communicated with a second water inlet pipe, and is communicated and connected with the four-stage cracking catalytic oil stain separation tower through a second communicating pipe; the bottoms of the four-stage cracking catalytic oil stain separation tower, the four-stage cooling oil stain separation tower and the five-stage cracking catalytic tower are respectively communicated and connected with the sewage conveying pipeline through a sewage discharge pipe; steel wire balls are arranged in the primary cracking catalytic tower, the tertiary cracking catalytic tower and the five-stage cracking catalytic tower; a plurality of water vapor mixing pipes are vertically arranged in the three-stage cooling oil stain separating tower, the four-stage cooling oil stain separating tower and the four-stage cracking catalytic oil stain separating tower; and a steel wire ball is arranged below the water-vapor mixing pipe in the four-stage pyrolysis catalytic oil stain separation tower.
2. An exhaust gas treatment system according to claim 1, wherein the conduit between the water return prevention device box and the primary cooling oil stain separation tower extends into the primary cooling oil stain separation tower; and a blow-off pipe communicated with the first-stage cooling oil stain separation tower extends into the first-stage cooling oil stain separation tower.
3. An exhaust gas treatment system according to claim 2, wherein the end of the pipe extending into the primary cooling oil separation column is provided with a plurality of inlet holes.
4. The exhaust gas treatment system according to claim 1, wherein the bottom of the water return prevention device tank is connected in communication with a drain pipe connected to the primary cooling oil stain separation tower through a water return prevention device drain pipe.
5. The waste gas treatment system according to claim 1, wherein the top of the primary cooling oil stain separation tower is further communicated with a vent pipe, the vent pipe is communicated with a connecting pipeline between the water return prevention device box and the primary cooling oil stain separation tower, and a one-way valve is communicated with the vent pipe.
6. The exhaust gas treatment system of claim 1, wherein an exhaust fan is disposed within each of the first enclosed hood, the second enclosed hood, and the second exhaust port.
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