CN110743305A - Waste gas treatment system and method in plastic particle production line - Google Patents
Waste gas treatment system and method in plastic particle production line Download PDFInfo
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- CN110743305A CN110743305A CN201911197539.XA CN201911197539A CN110743305A CN 110743305 A CN110743305 A CN 110743305A CN 201911197539 A CN201911197539 A CN 201911197539A CN 110743305 A CN110743305 A CN 110743305A
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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
- 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
- B01D53/002—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 condensation
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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
- B01D53/02—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/60—Combustion in a catalytic combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
Abstract
The invention discloses a waste gas treatment system and a waste gas treatment method in a plastic particle production line, which comprises a pretreatment part and a treatment part, wherein the pretreatment part comprises air-entraining pipes for respectively leading out gas from a plurality of melting furnaces and water filter tanks independently connected with each air-entraining pipe; the pretreatment part is connected and communicated with the treatment part through a collecting pipeline; the processing part comprises a conversion tank, a condensation tank, a membrane filter, a low-temperature water purification box, an activated carbon adsorption tank and an exhaust chimney which are sequentially connected and communicated from the air inlet end to the air outlet end. The system disclosed by the invention is reasonable in arrangement, and can be used for effectively treating waste gas in the production of regenerated plastic particles, particularly in the melting process, so that the up-to-standard emission is realized.
Description
Technical Field
The invention relates to the technical field of waste gas treatment and environmental protection, in particular to a waste gas treatment system and method in a plastic particle production line.
Background
The recycled plastic granules are plastic granules obtained by recycling used new materials or waste plastics, extruding the new materials or the waste plastics by a screw machine and then cutting the waste plastics into granules by a granulator. In the production process of the recycled plastic particles, particularly in the processes of hot melting and extrusion, a large amount of harmful gas containing dust particles is generated, the harmful gas contains organic substances such as hydrogen chloride, methyl methacrylate, styrene, toluene or aromatic oxides, and the direct discharge of the harmful gas is definitely not up to the standard.
CN2017100312543 discloses a waste gas treatment device in the production process of recycled plastic particles, which comprises a photocatalyst purification tower, a spray tower and an absorption tower which are connected in sequence, and the device realizes the deep treatment of waste gas. However, in actual use, some substances, especially light hydrocarbons like gasoline or kerosene generated during the decomposition of the ethylene polymer, are difficult to decompose in the photocatalyst purification tower, and in addition, some harmful substances such as toluene and dioxin are not treated to reach the standard.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the system and the method for treating the waste gas in the plastic particle production line, which have reasonable design and good treatment effect.
In order to achieve the purpose, the invention adopts the technical scheme that: a waste gas treatment system in a plastic particle production line comprises a pretreatment part and a treatment part, and is characterized in that,
the pretreatment part is arranged in a workshop and comprises air-entraining pipes for respectively leading out gas from a plurality of melting furnaces and a water filter box which is independently connected with each air-entraining pipe;
the pretreatment part and the treatment part are connected and communicated through a collecting pipeline;
the treatment part is arranged outside the workshop and comprises a conversion tank, a condensation tank, a membrane filter, a low-temperature water purification box, an activated carbon adsorption tank and an exhaust chimney which are sequentially connected and communicated from an air inlet end to an air outlet end.
Furthermore, each air-entraining pipe needs to be heated, and the heating can be carried out by adopting electric heating, water-proof heating or steam heating. The high-temperature gas with the temperature of approximately 200 ℃ coming out of the melting furnace is effectively prevented from being discharged to the air-entraining pipe, and the heat exchange is carried out between the high-temperature gas and the room temperature in the air-entraining pipe to quench and block the pipeline.
Furthermore, be fixed with the polylith filter screen according to the not co-altitude in the water filtration case, the one end mouth of pipe of bleed pipe stretches into in the water filtration case and be located the filter screen below that the position is minimum, and there is the pipeline at every water filtration case top and collects the pipe connection and communicate. Primarily removing particle impurities and a small part.
Furthermore, one side of the conversion tank is connected and communicated with the collecting pipeline, the conversion tank is a hollow tank body, the top of the conversion tank is connected and communicated with a vacuum pump through a first connecting pipeline, the other end of the vacuum pump is connected and communicated with a condensation tank, and a water spray pipe is connected and communicated with the first connecting pipeline and used for cooling the connecting pipe, the vacuum pump and the like.
Further, the condensation jar one side top is passed through the pipe connection and is communicated one side that has membrane filter, vertically evenly be fixed with a plurality of diaphragms by the non-woven fabrics preparation in the membrane filter, membrane filter's opposite side has low temperature water purification tank through the second connecting tube connection, and second connecting tube one end mouth of pipe stretches into bottom department in the low temperature water purification tank, has only placed the low temperature water of temperature below 5 ℃ in the low temperature water purification tank.
Further, the bottom that low temperature water purification tank top passed through pipe connection and intercommunication activated carbon adsorption jar is full of the active carbon in the activated carbon adsorption jar, is fixed with the flue main at activated carbon adsorption jar top, and the flue main is connected and is linked together with a plurality of main chimneys that activated carbon adsorption jar top was evenly fixed, and is fixed with on a plurality of main chimney inner walls so that main chimney inner chamber forms the heating combustion chamber, and the end of giving vent to anger of flue main passes through the pipeline, the air exhauster is direct to be connected and is linked together with the exhaust chimney, realizes arranging outward.
Further, activated carbon adsorption jar one side top is fixed with supplementary flue, and supplementary flue is connected and communicates with a plurality of time chimneys that activated carbon adsorption jar side was evenly fixed, also is fixed with on the inner wall of time chimney so that time chimney inner chamber forms the heating combustion chamber, and the end of giving vent to anger of supplementary flue passes through the pipeline to be connected and communicate with the catalytic combustion jar, and the end of giving vent to anger of catalytic combustion jar passes through pipeline, air exhauster and exhaust chimney and is connected and communicate, realizes arranging outward. The design of the auxiliary flue is that after the system is used for a period of time, when harmful gases such as dioxin are likely to be unclean, the electric heating catalytic combustion is carried out twice to ensure the emission reaching the standard.
The second technical scheme adopted by the invention is as follows: the waste gas treatment method in the plastic particle production line is characterized by comprising the following steps:
(1) primary filtration: leading the waste gas out of the plurality of melting furnaces through a plurality of air-entraining pipes, entering the bottoms of the corresponding water filter tanks, and filtering the waste gas by a plurality of filter screens and adsorbing water from bottom to top in the water filter tanks to remove part of coarse particles and a small amount of oil stains in the waste gas;
(2) primary condensation: gas exhausted from the water filter tanks is converged into a converging pipeline arranged in the whole workshop, enters a conversion tank through the converging pipeline for caching and pressure relief, and is pumped into a condensing tank through the conversion tank, a first connecting pipeline and a vacuum pump for condensation, and part of oil stains are removed;
(3) and (3) secondary condensation: gas discharged from the condensing tank firstly enters a membrane filter, oily impurities and fine particles in the gas are blocked and filtered by membranes of a plurality of non-woven fabrics in the membrane filter, then enter a low-temperature water purification tank through a second connecting pipeline and are discharged from the bottom in the low-temperature water purification tank, so that only low-temperature water with the temperature below 5 ℃ is placed in the low-temperature water purification tank, a small amount of oil stains carried in the gas are condensed and precipitated again, and the oily impurities carried in the waste gas are basically removed to reach the standard state through the step;
(4) activated carbon adsorption: gas exhausted from the top of the low-temperature water purification box enters from the bottom of the activated carbon adsorption tank through a pipeline, and is subjected to adsorption impurity removal through activated carbon filled in the activated carbon adsorption tank, so that small particles, oil stains or other substances which may exist are removed;
(5) catalytic combustion: the gas after the adsorption and impurity removal of the activated carbon adsorption tank enters the main flue from the main chimney at the top, harmful gas at the main chimney is electrically heated and combusted, the gas after the combustion and decomposition is pumped into the exhaust chimney under the action of the exhaust fan and discharged out of the exhaust chimney after reaching the standard, when the system is used for a period of time, the situation that partial harmful gas cannot reach the standard and be discharged after once combustion possibly exists, at the moment, the auxiliary chimney needs to be opened, the gas after the first combustion and decomposition at the secondary chimney enters the catalytic combustion tank again, the catalytic combustion tank is further catalyzed and combusted, and the gas discharged from the catalytic combustion tank is pumped into the exhaust chimney under the action of the exhaust fan and discharged out of the exhaust chimney after reaching the standard.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention heats the air-entraining pipe directly communicated with the melting furnace, effectively avoids the blocking phenomenon caused by rapid cooling and ensures the smooth discharge of waste gas;
(2) according to the invention, through the design of the conversion tank, the generation of the maximum pressure caused by the fact that large-volume gas in a large-volume pipeline directly enters a narrow pipeline is effectively avoided, and the pipeline explosion is avoided;
(3) according to the invention, oily substances in the waste gas, such as light hydrocarbon like gasoline or kerosene generated during the decomposition of ethylene polymers, are effectively removed through multi-stage condensation and cooling, and compared with the prior art, the removal rate reaches 99.56%;
(4) according to the invention, harmful substances contained in the gas are decomposed by electrically heating combustion at the top of the activated carbon adsorption tank, so that dioxin and the like contained in the gas are effectively removed, and the standard emission is realized;
(5) the system of the invention has reasonable arrangement, indoor and outdoor distribution, and reasonable arrangement of each part, effectively treats the waste gas in the production of the regenerated plastic particles, especially in the melting process, and realizes the standard emission.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention
FIG. 2 is a schematic structural diagram of the air-entraining pipe and the water filtering box of the invention
Fig. 3 is a structural sectional view of the water filtering tank according to the present invention.
Detailed Description
The invention will now be further described with reference to the specific drawings and examples. The following are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention. Any equivalent or similar substitutes should fall within the scope of protection of the invention without departing from the concept thereof. And parts not described in detail below are made with reference to the prior art. The pipeline involved in the invention is cleaned by introducing water vapor after being used for a period of time.
As shown in figures 1-3, the waste gas treatment system in the plastic particle production line comprises a pretreatment part and a treatment part, wherein the pretreatment part and the treatment part are connected and communicated through a collecting pipeline 4.
Wherein the pretreatment part is arranged in a workshop and comprises air-entraining pipes 2 which respectively lead out gas from a plurality of melting furnaces and a water filter tank 3 which is independently connected with each air-entraining pipe 2;
the air-entraining pipes 2 are heated by electric heating, water-proof heating or steam heating. The high-temperature gas which is nearly 200 ℃ and is discharged from the melting furnace 1 is effectively prevented from being discharged to the air guide pipe 2, and the heat exchange is carried out between the high-temperature gas and the room temperature in the air guide pipe 2 to quench and block the pipeline 2;
be fixed with the filter screen 3.1 that the polylith size is suitable according to the not co-altitude in the water rose box 3, the mesh size setting of filter screen 3.1 can in order to filter most particulate matter, the one end mouth of pipe of bleed pipe 2 stretches into in the water rose box 3 and be located the lowest filter screen 3.1 below in position, there is the pipeline at 3 tops of every water rose box and collects pipeline 4 and be connected and communicate. The pretreatment part primarily removes most of particle impurities and a small amount of oily organic waste carried by the waste gas.
The treatment part is arranged outside the workshop and comprises a conversion tank 5, a condensation tank 8, a membrane filter 10, a low-temperature water purification tank 12, an activated carbon adsorption tank 13 and an exhaust chimney 18 which are sequentially connected and communicated from an air inlet end to an air outlet end;
one side of the conversion tank 5 is connected and communicated with the collecting pipeline 4, the conversion tank 5 is a hollow tank body, the top of the conversion tank 5 is connected and communicated with a vacuum pump 7 through a first connecting pipeline 6, the other end of the vacuum pump 7 is connected and communicated with a condensing tank 8, and a water spray pipe 9 is connected and communicated with the first connecting pipeline 6 and used for cooling the first connecting pipeline 6, the vacuum pump 7 and the like, so that the vacuum pump is prevented from being damaged, the service life of the vacuum pump is prolonged, and meanwhile, gas is pre-cooled to prepare for subsequent condensation; the gas from the conversion tank 5 has a temperature of 50-60 ℃;
the top of one side of the condensing tank 8 is connected with one side of a membrane filter 10 through a pipeline and is communicated with the one side of the membrane filter 10, a plurality of membranes 10.1 made of non-woven fabrics are vertically and uniformly fixed in the membrane filter 10, the other side of the membrane filter 10 is connected with a low-temperature water purification tank 12 through a second connecting pipeline 11, a pipe orifice at one end of the second connecting pipeline 11 extends into the bottom in the low-temperature water purification tank 12, and only low-temperature water with the temperature below 5 ℃ is placed in the low-temperature water purification tank 12; the gas is cooled by low-temperature water, so that oil stains are further removed;
the top of the low-temperature water purification tank 12 is connected and communicated with the bottom of the activated carbon adsorption tank 13 through a pipeline, activated carbon is filled in the activated carbon adsorption tank 13, a main flue 14 is fixed at the top of the activated carbon adsorption tank 13, three groups of activated carbon adsorption tanks 13 are arranged in the figure for adsorption, namely, the main flue 14 is connected and communicated with three main chimneys 15 fixed at the tops of the three activated carbon adsorption tanks 13, an electric heating rod is fixed on the inner walls of the main chimneys 15 to enable the inner cavities of the main chimneys to form a heating combustion cavity 16, the air outlet end of the main flue 14 is connected with a pipeline, and an exhaust fan 17 is directly connected and communicated with an exhaust chimney 18 to realize external exhaust.
In order to achieve standard emission on the premise of not frequently replacing the active carbon in the active carbon adsorption tank 13, an auxiliary flue 19 is fixed at the top of one side of the active carbon adsorption tank 13, the auxiliary flue 19 is connected and communicated with three secondary chimneys 20 fixed on the sides of the three active carbon adsorption tanks 13, an electric heating rod is also fixed on the inner wall of each secondary chimney 20 so that the inner cavity of each secondary chimney forms a heating combustion cavity 16, the gas outlet end of the auxiliary flue 19 is connected and communicated with a catalytic combustion tank 21 through a pipeline, and the gas outlet end of the catalytic combustion tank 21 is connected and communicated with an exhaust chimney 18 through a pipeline and an exhaust fan 17, so that the exhaust is achieved. The design of the auxiliary flue is that after the system is used for a period of time, when harmful gases such as dioxin are likely to be unclean, the electric heating catalytic combustion is carried out twice to ensure the emission reaching the standard.
The method for treating the waste gas in the plastic particle production line by adopting the system comprises the following steps:
(1) primary filtration: leading the waste gas out of the plurality of melting furnaces through a plurality of air-leading pipes 2, entering the bottoms of the corresponding water filter boxes 3, and filtering the waste gas by a plurality of filter screens 3.1 and adsorbing water in the water filter boxes 3 from bottom to top to remove part of coarse particles and a small amount of oil stains in the waste gas;
(2) primary condensation: the gas exhausted from the water filter tanks 3 still has a certain temperature (about 70 ℃), and is converged into a collecting pipeline 4 arranged in the whole workshop, enters a conversion tank 5 through the collecting pipeline 4 for buffering and pressure relief, then is pumped into a condensing tank 8 through the conversion tank 5, a first connecting pipeline 6 and a vacuum pump 7, a plurality of condensers are fixed in the condensing tank 8 from top to bottom in parallel, cooling medium is introduced into the condensers, part of organic waste is condensed and settled at the bottom of the condensing tank, and is periodically exhausted from the bottom of the condensing tank, so that part of oil stains are removed;
(3) and (3) secondary condensation: gas discharged from the top of the condensation tank 8 firstly enters a membrane filter 10, oily impurities and fine particles in the gas are blocked and filtered by membranes 10.1 of a plurality of non-woven fabrics in the membrane filter 10, then the gas enters a low-temperature water purification tank 12 through a second connecting pipeline 11, and the gas is discharged from the bottom in the low-temperature water purification tank 12, so that only low-temperature water with the temperature below 5 ℃ is placed in the low-temperature water purification tank 12, a small amount of oil stains carried in the gas are cold-condensed into clusters and precipitates again, and the oily impurities carried in the waste gas are basically removed to reach the standard state through the step according to experience;
(4) activated carbon adsorption: gas exhausted from the top of the low-temperature water purification tank 12 enters from the bottom of the activated carbon adsorption tank 13 through a pipeline, and is subjected to adsorption impurity removal through activated carbon filled in the activated carbon adsorption tank 13 to remove possible small particles, oil stains or other substances;
(5) catalytic combustion: the gas after the adsorption and impurity removal of the activated carbon adsorption tank 13 enters the main flue 14 from the main chimney 15 at the top, the harmful gas at the main chimney 15 is electrically heated and combusted (the temperature is controlled to be above 800 ℃), the gas after the combustion and decomposition is pumped into the exhaust chimney 18 under the action of the exhaust fan 17 and discharged out after reaching the standard from the exhaust chimney 18, when the system of the invention is used for a period of time, the situation that partial harmful gas can not reach the standard after once combustion can exist, at the moment, the auxiliary flue 19 needs to be opened and closed to the main flue 14, the gas after the first combustion and decomposition at the secondary chimney 20 enters the catalytic combustion tank again, the gas is further catalytically combusted under the catalysis of the conventional metal oxide (the mechanism of the catalytic combustion is the same as the prior art), the gas exhausted from the catalytic combustion tank 21 is pumped into the exhaust chimney 18 under the action of the exhaust fan 17, and is discharged out of the exhaust stack 18 after reaching the standard.
Claims (8)
1. A waste gas treatment system in a plastic particle production line comprises a pretreatment part and a treatment part, and is characterized in that,
the pretreatment part is arranged in a workshop and comprises air-entraining pipes for respectively leading out gas from a plurality of melting furnaces and a water filter box which is independently connected with each air-entraining pipe;
the pretreatment part and the treatment part are connected and communicated through a collecting pipeline;
the treatment part is arranged outside the workshop and comprises a conversion tank, a condensation tank, a membrane filter, a low-temperature water purification box, an activated carbon adsorption tank and an exhaust chimney which are sequentially connected and communicated from an air inlet end to an air outlet end.
2. The system for treating the waste gas in the plastic particle production line as claimed in claim 1, wherein the heating required in each air-entraining pipe can be performed by electric heating, water-proof heating or steam heating.
3. The waste gas treatment system in the plastic particle production line as claimed in claim 1 or 2, wherein a plurality of filter screens are fixed in the water filter box according to different heights, one end pipe orifice of the air-entraining pipe extends into the water filter box and is positioned below the lowest filter screen, and a pipeline is arranged at the top of each water filter box and is connected and communicated with the collecting pipeline.
4. The system for treating the waste gas in the plastic particle production line as claimed in claim 3, wherein one side of the conversion tank is connected and communicated with the collecting pipe, the conversion tank is a hollow tank body, the top of the conversion tank is connected and communicated with a vacuum pump through a first connecting pipe, the other end of the vacuum pump is connected and communicated with a condensing tank, and a spray pipe is connected and communicated with the first connecting pipe.
5. The waste gas treatment system in the plastic particle production line as claimed in claim 4, wherein the top of one side of the condensation tank is connected with one side of a membrane filter through a pipeline, a plurality of membranes made of non-woven fabrics are vertically and evenly fixed in the membrane filter, the other side of the membrane filter is connected with a low-temperature water purification tank through a second connecting pipeline, a pipe orifice at one end of the second connecting pipeline extends into the bottom of the low-temperature water purification tank, and only low-temperature water with the temperature below 5 ℃ is placed in the low-temperature water purification tank.
6. The system for treating the waste gas in the plastic particle production line as claimed in claim 5, wherein the top of the low-temperature water purification box is connected and communicated with the bottom of the activated carbon adsorption tank through a pipeline, the activated carbon adsorption tank is filled with activated carbon, a main flue is fixed on the top of the activated carbon adsorption tank, the main flue is connected and communicated with a plurality of main chimneys uniformly fixed on the top of the activated carbon adsorption tank, inner walls of the main chimneys are fixed with a heating combustion chamber, and an air outlet end of the main flue is directly connected and communicated with an exhaust chimney through a pipeline and an exhaust fan to realize external discharge.
7. The system for treating the waste gas in the plastic particle production line as claimed in claim 6, wherein an auxiliary flue is fixed at the top of one side of the activated carbon adsorption tank, the auxiliary flue is connected and communicated with a plurality of secondary chimneys uniformly fixed on the side surface of the activated carbon adsorption tank, a heating combustion cavity is formed in inner cavities of the secondary chimneys, the gas outlet end of the auxiliary flue is connected and communicated with the catalytic combustion tank through a pipeline, and the gas outlet end of the catalytic combustion tank is connected and communicated with the exhaust chimney through a pipeline and an exhaust fan, so that the exhaust is realized.
8. The waste gas treatment method in the plastic particle production line is characterized by comprising the following steps:
(1) primary filtration: leading the waste gas out of the plurality of melting furnaces through a plurality of air-entraining pipes, entering the bottoms of the corresponding water filter tanks, and filtering the waste gas by a plurality of filter screens and adsorbing water from bottom to top in the water filter tanks to remove part of coarse particles and a small amount of oil stains in the waste gas;
(2) primary condensation: gas exhausted from the water filter tanks is converged into a converging pipeline arranged in the whole workshop, enters a conversion tank through the converging pipeline for caching and pressure relief, and is pumped into a condensing tank through the conversion tank, a first connecting pipeline and a vacuum pump for condensation, and part of oil stains are removed;
(3) and (3) secondary condensation: gas discharged from the condensing tank firstly enters a membrane filter, oily impurities and fine particles in the gas are blocked and filtered by membranes of a plurality of non-woven fabrics in the membrane filter, then enter a low-temperature water purification tank through a second connecting pipeline and are discharged from the bottom in the low-temperature water purification tank, so that only low-temperature water with the temperature below 5 ℃ is placed in the low-temperature water purification tank, a small amount of oil stains carried in the gas are condensed and precipitated again, and the oily impurities carried in the waste gas are basically removed to reach the standard state through the step;
(4) activated carbon adsorption: gas exhausted from the top of the low-temperature water purification box enters from the bottom of the activated carbon adsorption tank through a pipeline, and is subjected to adsorption impurity removal through activated carbon filled in the activated carbon adsorption tank, so that small particles, oil stains or other substances which may exist are removed;
(5) catalytic combustion: the gas after the adsorption and impurity removal of the activated carbon adsorption tank enters the main flue from the main chimney at the top, harmful gas at the main chimney is electrically heated and combusted, the gas after the combustion and decomposition is pumped into the exhaust chimney under the action of the exhaust fan and discharged out of the exhaust chimney after reaching the standard, when the system is used for a period of time, the situation that partial harmful gas cannot reach the standard and be discharged after once combustion possibly exists, at the moment, the auxiliary chimney needs to be opened, the gas after the first combustion and decomposition at the secondary chimney enters the catalytic combustion tank again, the catalytic combustion tank is further catalyzed and combusted, and the gas discharged from the catalytic combustion tank is pumped into the exhaust chimney under the action of the exhaust fan and discharged out of the exhaust chimney after reaching the standard.
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