CN113877410B - VOCs (volatile organic compounds) and odor treatment method for industrial sewage collection and transportation system - Google Patents
VOCs (volatile organic compounds) and odor treatment method for industrial sewage collection and transportation system Download PDFInfo
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Classifications
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- 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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/304—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
A VOCs and odor treatment method for an industrial sewage collection and transportation system comprises the following steps: 1) Planning and distinguishing each sewage collecting and conveying pipeline in the sewage collecting and conveying system according to the trend of the sewage collecting and conveying pipeline, independently treating each planned and distinguished sewage collecting and conveying pipeline, and sealing and installing a first air purifying device at one or more well heads of each sewage collecting and conveying pipeline; 2) One or more gas collecting well covers are added at the collecting positions of each sewage collecting and conveying pipeline and two or more than two sewage collecting and conveying pipelines and are used for collecting VOCs and odor generated in the sewage collecting and conveying system, and the gas collecting well covers are sequentially communicated with an induced draft fan, a second air purifying device and an exhaust chimney through pipelines; 3) Sealing the wellhead and/or the open position of the sewage collection and delivery system without the first wind purifying device by using a sealing well cover; and the first and second air purifying devices are utilized to carry out desulfurization, oxidation and adsorption treatment on all VOCs and odor in the sewage collecting and conveying system, and the gas reaching the standard is directly discharged.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a treatment method for effectively treating odor output by inspection wells, sewage wells and/or other open positions in a sewage collection and transportation system in the petrochemical industry.
Background
Volatile Organic Compounds (VOCs), hydrogen sulfide (H 2 S), organic sulfides, malodorous peculiar smell gas, benzene, toluene, xylene and the like are main pollutants in the odor discharged by the petrochemical industry, and particularly the Volatile Organic Compounds (VOCs) are more harmful, and along with the stricter environmental requirements, the petrochemical industry is forced to construct standardized odor control tasks. The malodorous gas represented by VOCs and H 2 S not only causes great potential safety hazard to enterprise production, but also causes serious corrosion of equipment and pipelines, thereby causing the rise of production cost. Meanwhile, the health of staff life is greatly endangered, and the ecological environment is seriously influenced. All the harmful gases generated in the production process are treated organically, so that qualified emission is realized. However, in the sewage collecting and transporting system, odor is still generated and discharged from various inspection wells, sewage wells or other open positions, which belongs to the field of unorganized odor discharge, and the sewage collecting and transporting system is not properly treated, and because the sewage collecting and transporting system has long pipelines, the inspection wells, sewage wells or other open positions have a large number, namely, the sewage collecting and transporting system has the characteristics of wide dispersion area, low relative pollutant concentration, high collecting and detecting difficulty and the like, the odor discharged from the inspection wells, the sewage collecting and transporting system is difficult to carry out the organized and standardized treatment technology and means on the odor discharged from the inspection wells, the sewage wells or other open positions.
In particular, due to the large conveying range of the sewage collecting and conveying system and the complicated trend of each sewage pipeline, the effective unified collection and treatment are difficult to carry out organized discharge, in order to solve the problem, the existing method is to directly seal all the well covers in the sewage collecting and conveying system, and although the unorganized discharge of odor is reduced to a certain extent, most of toxic and harmful gases are continuously accumulated and enriched in the sewage wells and the pipelines, so that the potential risks of pipeline corrosion and sewage well explosion are aggravated.
Disclosure of Invention
Aiming at the technical difficulties of unorganized emission of VOCs, H 2 S and other odor treatment in pollution sources such as sewage pipelines, sewage wells and oil separation wells in a sewage gathering and conveying system and the defects of the existing treatment method, the invention provides the VOCs and the odor treatment method for the industrial sewage gathering and conveying system, which are distributed, have higher treatment efficiency, more flexible layout and higher technical feasibility.
The invention relates to a VOCs and odor treatment method for an industrial sewage collection and transportation system, which comprises the following steps,
1) Planning and distinguishing each sewage collecting and conveying pipeline in the sewage collecting and conveying system according to the trend of the sewage collecting and conveying pipeline, independently treating each planned and distinguished sewage collecting and conveying pipeline, and sealing and installing a first air purifying device at one or more well heads of each sewage collecting and conveying pipeline;
2) One or more gas collecting well covers are added at the collecting positions of each sewage collecting and conveying pipeline and two or more than two sewage collecting and conveying pipelines and are used for collecting VOCs and odor generated in the sewage collecting and conveying system, and the gas collecting well covers are sequentially communicated with an induced draft fan, a second air purifying device and an exhaust chimney through pipelines;
3) Sealing the wellhead and/or the open position of the sewage collection and delivery system, where the first wind purifying device is not arranged, by using a sealing well cover;
When the second air purifying device is not started, the first air purifying device carries out desulfurization, oxidization and adsorption treatment on VOCs and odor in the sewage collecting and conveying system, and directly discharges gas reaching the standard;
When the second air purifying device is started, VOCs and odor in the sewage collecting and conveying system are pumped out by the second air purifying device through the induced draft fan, enter the second air purifying device to carry out desulfurization, oxidation and adsorption treatment, discharge gas reaching the standard through the exhaust chimney, and simultaneously input air into the sewage collecting and conveying system by the first air purifying device.
Preferably, before the first wind purifying device is installed, a wellhead concrete foundation is manufactured at the installation wellhead, and a positioning embedded part for sealing and fixing the first wind purifying device is embedded.
Preferably, the front end and the rear end of each sewage collecting and conveying pipeline are respectively provided with the first air purifying device, and the collecting positions of two or more than two sewage collecting and conveying pipelines are additionally provided with a gas collecting well cover.
Preferably, the first wind purifying device comprises a treatment box body which is in sealing connection with the positions of all the well heads of the sewage collecting and conveying system, a pretreatment unit and a membrane treatment unit are sequentially arranged in the treatment box body from bottom to top, the adsorption treatment unit can integrate desulfurization, oxidation and adsorption through replacement of adsorption materials, catalytic materials and decomposition materials, an exhaust cover is sealed and fixed on the top of the treatment box body, VOCs and odor in the industrial sewage collecting and conveying system are output through the positions of all the well heads, pretreatment is carried out after entering the treatment box body through the pretreatment unit, dehydration treatment is carried out on the entering odor through the membrane treatment unit, desulfurization, oxidation and adsorption treatment are carried out through the adsorption treatment unit, and finally the gas reaching the emission standard is discharged into the atmosphere through the exhaust cover.
Preferably, the treatment box body is respectively formed with a base part and a main body part, and a pretreatment unit capable of demisting and deoiling all VOCs and odor entering the treatment box body is fixedly arranged in the base part.
Preferably, a plurality of rings locating lever is installed to the base part of handling box, rings locating lever is the internal thread siphunculus, upper portion and the direct threaded connection of eye bolt, and the bottom is connected with peripheral location built-in fitting and the first sealed pad in well head position.
Preferably, the membrane processing unit is fixedly arranged above the pretreatment unit in the main body part, and comprises a support frame fixedly connected with the inner wall of the processing box body, and a selective unpowered gas membrane device which is in sealing connection with the support frame through a sealing ring.
Preferably, the selective unpowered gas film device is matched with the shape of the treatment box body, and comprises a basin bottom structure which is provided with bulges at the periphery and concave in the middle, an annular groove is formed in the middle of the bulges at the periphery, a through groove is formed in the lowest position of the basin bottom structure in the middle, an automatic water draining and gas blocking device is arranged in the middle of the through groove, an inclined surface is formed in the basin bottom structure from the through groove to the side edge, and the selective unpowered gas film is adhered on the inclined surface.
Preferably, the adsorption treatment unit comprises a filling hanger which is detachably connected with the inner top of the treatment box body, a hanger inserting knife is mounted at the bottom of the filling hanger, the hanger inserting knife is in sealing connection with the membrane treatment unit, a plurality of filling boxes which are parallel up and down and can be filled with and replaced with different materials respectively are arranged in the filling hanger, and a second sealing gasket is arranged at the joint of each filling box and the filling hanger.
Preferably, the hanger inserting knife is inserted into an annular groove of the unpowered gas membrane device, and liquid jelly used for sealing and connecting the hanger inserting knife and the unpowered gas membrane device is injected into the annular groove.
The VOCs and the odor treatment method for the industrial sewage collecting and conveying system solve the problem that the existing sewage collecting and conveying system is free of odor pollutants such as VOCs, H 2 S and the like in the odor, and realize the collection, conveying, purification treatment and organized emission of the VOCs, H 2 S and the like in the well and the drainage pipeline of the sewage collecting and conveying system in a brand-new decentralized treatment mode for each sewage collecting and conveying pipeline.
The second air purifying device is provided with a pretreatment technology, a desulfurization technology, a photocatalytic oxidation technology, a biological deodorization technology and an adsorption technology, wherein the odor generated by the industrial sewage collecting and conveying system is collected in a concentrated manner, and is discharged after being treated.
The invention can realize modularized design and standardized production based on the use of the first air purifying device and the second air purifying device, and has the characteristics of low investment operation cost, high treatment efficiency and technical feasibility, flexible layout, simple and convenient installation and maintenance, and the like.
Drawings
FIG. 1 is a schematic diagram of the treatment method of the present invention.
Fig. 2 is a schematic front view of a first wind purifying device according to the present invention.
Fig. 3 is a schematic view of the internal structure of the first wind purifying device in the present invention.
Fig. 4 is a schematic perspective view of a treatment tank according to the present invention.
FIG. 5 is a schematic perspective view of a selective unpowered gas membrane device in the present invention.
FIG. 6 is a schematic side view of a selectively unpowered gas membrane device in accordance with the present invention.
Fig. 7 is an enlarged schematic view of the portion a in fig. 3.
The reference numerals in the figures illustrate: 1a first wind purifying device, 2a second wind purifying device, 3a wellhead concrete foundation, 4 a gas collecting well cover, 5 a draught fan, 6a sealing well cover, 7a sewage collecting pipeline, 8 a gas exhaust chimney, 9 a pipeline, 10a base part, 11 a main body part, 12a flame retardant heat preservation layer, 13 a lifting ring positioning rod, 14 a lifting ring bolt, 15 a positioning embedded part, 16a first sealing pad, 17 a pretreatment unit, 18 a membrane treatment unit, 19 an adsorption treatment unit, 20, a gas exhaust cover, 30 a supporting frame, 31a sealing ring, 32 a selective unpowered gas membrane device, 33 an annular groove, 34 a bulge, 35 a basin bottom structure, 36 an automatic water and gas discharging device, 37 a through groove, 38 a selective unpowered gas membrane, 39 a liquid jelly, 40 a filler, 41 a filler box, 42 a hanging rack inserting knife, 43 a second sealing pad, 50 a ventilation window, 51 a lock catch, 52 a fire retarding net, 53 a fire retarding heat preservation layer and 54 a third sealing pad
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the attached drawings, wherein the described embodiments are only one specific embodiment, and not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in FIG. 1, the VOCs and odor treatment method for the industrial sewage collection and transportation system of the invention comprises the following steps:
1) Planning and distinguishing each sewage collecting and conveying pipeline in the sewage collecting and conveying system according to the trend of the sewage collecting and conveying pipeline, and independently treating each planned and distinguished sewage collecting and conveying pipeline (also called a drainage pipeline) 7, wherein a first air purifying device 1 is hermetically arranged at one or more well heads of each sewage collecting and conveying pipeline 7;
For example, in the sewage collecting and transporting system which is distributed in the shape of a Chinese character 'tian', the sewage collecting and transporting pipelines 7 with 12 segments and the collecting positions of the 9 sewage collecting and transporting pipelines 7 are distinguished according to the trend of each sewage collecting and transporting pipeline 7, and a plurality of water seal well heads, inspection well heads, oil separation well heads, water collection well heads and the like are distributed on the sewage collecting and transporting pipeline 7 with each segment. Preferably, the first wind purifying devices 1 are respectively arranged on the well heads at the beginning end and the tail end of each line section sewage collecting and conveying pipeline 7, and a plurality of first wind purifying devices 1 can be arranged on a plurality of well heads of each line section (strip) sewage collecting and conveying pipeline 7, wherein the specific well heads can be water seal well heads, inspection well heads, oil separation well heads and water collection well heads which are unequal; before the first wind purifying device 1 is installed, a wellhead concrete foundation 3 is manufactured at the installation wellhead, so that the ground is firm and smooth, and the stability and the tightness of the first wind purifying device 1 during installation and operation are ensured.
2) A gas collecting well cover 4 is added at the collecting position of the sewage collecting and conveying pipeline 7 and is used for collecting odor generated in the sewage collecting and conveying system, and the gas collecting well cover 4 is sequentially communicated with an induced draft fan 5, a second air purifying device 2 and an exhaust chimney 8 through a pipeline 9;
The method specifically comprises the following steps: still take the sewage collection and transportation system of "field" font distribution as an example, set up a gas collection well lid 4 in four corners and middle cross crisscross position department, install a set of draught fan 5, second net wind device 2 and exhaust stack 8 to a gas collection well lid 4, utilize draught fan 5 to take out VOCs and foul smell in the sewage collection and transportation system through 9, gas collection well lid 4, get into second net wind device 2 and collect, carry, purification treatment, finally by exhaust stack 8 organized emission. The second air purifying device 2 is a power type exhaust gas purifying device with multiple technologies coupled, and the related coupled technologies mainly comprise a pretreatment technology, a desulfurization technology, a photocatalytic oxidation technology, a biological deodorization technology and an adsorption technology, so that odor generated by an industrial sewage collecting and conveying system is collected in a concentrated mode, treated and then discharged. The second wind cleaning device 2 may be a wind cleaning device in existing organized processing technology, which will not be described in detail here.
Of course, the second wind purifying device 2 can also be installed at the middle section of each sewage collecting and conveying pipeline 7, namely, the gas collecting well cover 4 is arranged at the middle section of the sewage collecting and conveying pipeline 7, and is suitable for the sewage collecting and conveying pipeline 7 with a longer distance, and VOCs and odor in the sewage collecting and conveying pipeline 7 are pumped out for effective treatment.
3) Sealing the wellhead and/or the open position of the sewage collection and delivery system, where the first wind purifying device 1 is not arranged, by using a sealing well cover 6;
The method specifically comprises the following steps: the sealing well cover 6 is used for sealing treatment on the well mouth of the first wind purifying device 1 which is not arranged in each line section (strip) sewage collecting and conveying system 7, namely the sealing well cover 6 replaces the original well cover in the sewage collecting and conveying system, so that the tightness of the whole sewage collecting and conveying system is ensured, and the gas in the whole sewage collecting and conveying system can only be discharged after being treated by the first wind purifying device 1 and/or the second wind purifying device 2;
The specific operation is carried out in the following way:
In a normal state, the first air purifying device 1 carries out desulfurization, oxidation and adsorption treatment on odor in the sewage collecting and conveying system, and directly discharges gas reaching the standard; specifically, the membrane treatment unit 18 inside the first wind purifying device 1 is utilized to realize unpowered operation, and the purification of the unorganized exhaust gas is completed. In detail, the volatile toxic and harmful gas in the sewage collection and transportation system firstly enters the pretreatment unit 17 of the first air purification device 1 to remove water mist and oil gas, then enrichment screening of pollutants is realized through the membrane treatment unit 18, H 2 S in the pollutants is decomposed and removed after passing through the desulfurization unit in the adsorption treatment unit, most VOCs and other odor are polymerized and decomposed after passing through the catalytic oxidation unit, and the rest few VOCs and other odor are thoroughly adsorbed and purified in the adsorption unit.
When the internal gas pressure of the sewage collection and delivery system reaches a preset value, starting the second air purifying device 2; VOCs and odor in the sewage collecting and transporting system are pumped out by the second air purifying device 2 through the induced draft fan 5, are subjected to desulfurization, oxidation and adsorption treatment by the second air purifying device 2, and finally, the gas reaching the standard is discharged through the exhaust chimney 8. The indexes of various pollutants of the gas purified by the first air purifying device 1 and the second air purifying device 2 accord with the emission standard regulated by the relevant national standards, and the potential safety hazard and environmental protection risk caused by unorganized emission of odor by the sewage collecting and transporting system in the factory area of enterprises are thoroughly solved.
Of course, the second wind purifying device 2, the induced draft fan 5 and the exhaust chimney 8 can also adjust the starting and stopping time according to the length of the sewage collecting and conveying system and working conditions, and can be started periodically.
When the second air purifying device 2, the induced draft fan 5 and the exhaust chimney 8 work, the first air purifying device 1 reversely enters air, and air is input into the industrial sewage collecting and conveying system through the first air purifying device 1 to supplement the air pressure of the industrial sewage collecting and conveying system.
As shown in fig. 2 and 3, the first wind purifying device 1 comprises a treatment box body, wherein the bottom of the treatment box body is in an open shape and can be in sealing connection with an inspection well, a sewage well and/or an open position, and the top of the treatment box body is in sealing and fixed connection with an exhaust cover 20, so that all VOCs and odor discharged from the inspection well, the sewage well and/or the open position enter the treatment box body, demisting, deoiling, dewatering, desulfurizing, oxidizing and adsorbing treatment are performed in the treatment box body, and the treatment box body is discharged into air from the exhaust cover 20 after reaching the discharge standard.
The treatment box body is integrally formed by metal materials, and of course, the treatment box body can also be integrally injection-molded by other plastics with fireproof functions. The treatment box body in the invention is a closed box body with only upper and lower openings, a base part 10 and a main body part 11 are formed, the longitudinal section of the treatment box body is in an inverted T shape, the transverse section of the treatment box body can be square, or can be in other shapes such as a round shape, and the like, and the embodiment is illustrated by taking square as an example. The pretreatment unit 17, the membrane treatment unit 18 and the adsorption treatment unit 19 integrating desulfurization, oxidation and adsorption functions are fixedly arranged in the treatment box body from bottom to top in sequence. The method specifically comprises the following steps:
As shown in fig. 3, the treatment tank is fixedly attached with a flame-retardant heat-insulating layer 12 to the inner wall surface of the main body 11. At the four corners of the base part 10 are mounted a sling positioning rod 13, respectively, which extends through the base part 10. The lifting ring positioning rod 13 is an internal thread through pipe, and the upper part of the lifting ring positioning rod is directly connected with the lifting ring bolt 14 through threads, so that the lifting ring positioning rod is convenient to install and detach; the bottom is connected with a positioning embedded part 15 embedded in the wellhead concrete foundation 3 and is sealed by a first sealing gasket 16 before the base part 10 is connected with the positioning embedded part 15, so that odor discharged from an inspection well, a sewage well and/or an open position is prevented from being discharged from a gap between the treatment tank and the ground.
The pretreatment unit 17 is fixedly installed in the base portion 10, the pretreatment unit 17 and the treatment box are shaped, in this embodiment, a square demister is positioned and fixed on the inner top of the base portion 10 by a set screw (not shown), so that all the gas entering the treatment box can rise into the main body portion 11 after passing through the demister. The demisting device adopts commercial mature products, and the specific structure and the working principle of the demisting device are not described in detail.
The main body 11 is internally provided with a membrane treatment unit 18 fixedly arranged above the pretreatment unit 17, and as shown in fig. 3, the membrane treatment unit 18 comprises a support frame 30 fixed with the inner wall surface of the treatment box body in a welding mode and the like, and a selective unpowered gas membrane device 32 connected with the support frame 30 in a sealing mode through a sealing ring 31, a connecting piece such as a bolt and the like. Specifically, the selective unpowered gas membrane device 32 is square in shape matching with the treatment box body, and as shown in fig. 5, the selective unpowered gas membrane device comprises a protrusion 34 positioned at the periphery and a basin bottom structure 35 positioned in the middle and concave inwards, an annular groove 33 is formed in the middle of the protrusion 34 at the periphery, a through groove 37 is formed in the lowest position of the basin bottom structure 35 in the middle, an automatic water draining and gas blocking device 36 is mounted in the middle of the through groove 37, and the automatic water draining and gas blocking device 36 is made of ABS+PC plastic and can drain redundant liquid in the through groove 37. The basin bottom structure 35 forms inclined surfaces from the through groove 37 to both sides, and a selective unpowered gas film 38 is adhered to the inclined surface of each side, so that gas entering through the demister can enter above the membrane treatment unit 18 through the selective unpowered gas film 38, and water is prevented from being below the membrane treatment unit 18 by the selective unpowered gas film 38. A small amount of water entering the upper part of the membrane treatment unit 18 through the selective unpowered gas membrane 38 is collected through the through groove 37 and then discharged from the automatic water discharge gas barrier 36. The selective unpowered gas membrane 38 is a commercially available mature product and will not be described in detail.
The adsorption treatment unit 19 is arranged at the inner top of the treatment box body, the adsorption treatment unit 19 comprises a filler hanging frame 40 fixedly arranged at the inner top of the treatment box body, and the filler hanging frame 40 is a square frame matched with the square shape of the treatment box body, is closed at the periphery and has an open structure at two ends. The square hanger inserting knife 42 is installed at the bottom of the filler hanger 40, when the filler hanger 40 is installed inside the treatment box, the hanger inserting knife 42 is just inserted into the annular groove 33 arranged on the bulge of the selective unpowered gas membrane device 32, then the liquid jelly 39 is injected into the annular groove 33, after the liquid jelly 39 is solidified, a good sealing effect is formed between the membrane treatment unit 18 and the adsorption treatment unit 19, and meanwhile, the bottom of the filler hanger 40 is abutted against the upper surface of the bulge 34 of the selective unpowered gas membrane 38, as shown in fig. 6.
The packing hanger 40 is internally provided with three packing boxes 41 which are arranged in parallel up and down, the packing boxes 41 are inserted and installed through a drawer type structure, decomposition materials, catalytic materials and adsorption materials are sequentially filled in the three packing boxes 41 from bottom to top, so that effective treatments such as desulfurization, oxidation and adsorption can be carried out on odor in a collecting and conveying system, and a second sealing gasket 43 is arranged at the joint between each packing box 41 and the packing hanger 40, and the second sealing gasket 43 is a rubber sealing gasket, so that the flowing direction of the odor can be effectively controlled, and the treatment efficiency is improved. When the packing is required to be replaced, the adsorption treatment unit 19 is taken out together with the membrane treatment unit 18, and the packing replacement and the replacement of the selective unpowered gas membrane 38 are performed.
The upper part of the treatment box body is provided with a detachable exhaust cover 20, the exhaust cover 20 is provided with a ventilation window 50, the inside of the ventilation window 50 is provided with a fire-retarding net 52, the fire-retarding net 52 is made of brass, the inner wall of the exhaust cover 20 is provided with a fire-retarding heat-preserving layer 53, the exhaust cover 20 is connected with the top of the treatment box body in a hidden locking manner through two lock catches 51 which are internally installed, and a third sealing gasket 54 is used for sealing between the exhaust cover 20 and the treatment box body, as shown in fig. 7.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A VOCs and odor treatment method for an industrial sewage collection and transportation system comprises the following steps,
1) Planning and distinguishing each sewage collecting and conveying pipeline in the sewage collecting and conveying system according to the trend of the sewage collecting and conveying pipeline, independently treating each planned and distinguished sewage collecting and conveying pipeline, and sealing and installing a first air purifying device at one or more well heads of each sewage collecting and conveying pipeline;
2) One or more gas collecting well covers are added at the collecting positions of each sewage collecting and conveying pipeline and two or more than two sewage collecting and conveying pipelines and are used for collecting VOCs and odor generated in the sewage collecting and conveying system, and the gas collecting well covers are sequentially communicated with an induced draft fan, a second air purifying device and an exhaust chimney through pipelines;
3) Sealing the wellhead and/or the open position of the sewage collection and delivery system, where the first wind purifying device is not arranged, by using a sealing well cover;
When the second air purifying device is not started, the first air purifying device carries out desulfurization, oxidization and adsorption treatment on VOCs and odor in the sewage collecting and conveying system, and directly discharges gas reaching the standard;
the membrane treatment unit inside the first wind purifying device is utilized to realize unpowered operation, and the purification of the unorganized exhaust gas is completed;
When the second air purifying device is started, odor in the sewage collecting and conveying system is pumped out by the second air purifying device through the induced draft fan, enters the second air purifying device to carry out desulfurization, oxidation and adsorption treatment, and gas reaching the standard is discharged through the exhaust chimney, and meanwhile air is input into the sewage collecting and conveying system by the first air purifying device.
2. The method for treating VOCs and malodor in an industrial sewage collection and transportation system according to claim 1, wherein before installing the first wind purifying device, a wellhead concrete foundation is fabricated at a wellhead, and a positioning embedded part for sealing and fixing the first wind purifying device is embedded.
3. The method for treating VOCs and malodor in an industrial sewage collecting and transporting system according to claim 1, wherein a first wind purifying device is respectively provided at the front and rear ends of each sewage collecting and transporting pipeline, and a gas collecting well cover is additionally provided at the collecting position of two or more sewage collecting and transporting pipelines.
4. The method for treating VOCs and odor of industrial sewage collecting and transporting system according to claim 2, wherein the first wind purifying device comprises a treatment box body which is connected with the positions of all the well heads of the sewage collecting and transporting system in a sealing way, a pretreatment unit and a membrane treatment unit are sequentially arranged in the treatment box body from bottom to top, the membrane treatment unit can integrate desulfurization, oxidation and adsorption into a whole by replacing adsorption materials, catalytic materials and decomposition materials, an exhaust cover is sealed and fixed on the top of the treatment box body, VOCs and odor in the industrial sewage collecting and transporting system are output through the positions of all the well heads, the pretreatment is carried out through the pretreatment unit after entering the treatment box body, dehydration treatment is carried out on the entered odor through the membrane treatment unit, finally desulfurization, oxidation and adsorption treatment are carried out through the adsorption treatment unit, and finally the gas reaching the emission standard is discharged into the atmosphere from the exhaust cover.
5. The method for treating VOCs and malodor in an industrial sewage collecting and transporting system according to claim 4, wherein the treating tank is formed with a base portion and a main body portion, respectively, and a pretreatment unit capable of demisting all VOCs and malodor entering the treating tank is fixedly installed inside the base portion.
6. The method for treating VOCs and malodor treatment according to claim 5, wherein the base portion of the treatment tank is provided with a plurality of hanging ring positioning rods, the hanging ring positioning rods are internal threaded through pipes, the upper portions of the hanging ring positioning rods are directly connected with hanging ring bolts in a threaded manner, and the bottoms of the hanging ring positioning rods are connected with positioning embedded parts and the first sealing gaskets at the periphery of the wellhead.
7. The method for treating VOCs and malodor in an industrial sewage collecting and transporting system according to claim 6, wherein the membrane treatment unit is fixedly installed above the pretreatment unit in the main body, and the membrane treatment unit comprises a supporting frame fixedly connected with the inner wall of the treatment tank, and a selective unpowered gas membrane device hermetically connected with the supporting frame through a sealing ring.
8. The method for treating VOCs and odor in an industrial sewage collecting and transporting system according to claim 7, wherein said selective unpowered gas membrane device is matched with the shape of the treatment tank, and comprises a basin bottom structure with a concave shape in the middle and a convex part on the periphery, an annular groove is provided in the middle of the convex part on the periphery, a through groove is provided in the lowest position of the basin bottom structure in the middle, an automatic water-draining and gas-blocking device is provided in the middle of the through groove, an inclined plane is formed by the basin bottom structure from the through groove to the side, and a selective unpowered gas membrane is adhered on the inclined plane.
9. The method for treating VOCs and odor in an industrial sewage collecting and transporting system according to claim 8, wherein the adsorption treatment unit comprises a packing rack detachably connected with the top in the treatment tank, a rack inserting knife is installed at the bottom of the packing rack, the rack inserting knife is in sealing connection with the membrane treatment unit, a plurality of packing boxes which are parallel up and down and can be respectively filled with and replaced with different materials are arranged in the packing rack, and a second sealing gasket is arranged at the joint of each packing box and the packing rack.
10. The VOCs and odor treatment method according to claim 9, wherein the hanger blade is inserted into an annular groove of the unpowered gas membrane device, and liquid jelly for sealing connection between the hanger blade and the unpowered gas membrane device is injected into the annular groove.
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