CN111111410A - Combined type industrial waste gas VOC treatment system and process - Google Patents
Combined type industrial waste gas VOC treatment system and process Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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- 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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- 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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- B01D53/14—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 absorption
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The embodiment of the invention discloses a combined type industrial waste gas VOC treatment system and a process, and particularly relates to the field of waste gas VOC treatment, wherein the system comprises a cooling system, a gas-liquid separation system, a circulating compressor, a chemical conversion adsorption system, a physical adsorption system and a steam generation system; the cooling system is formed by connecting three precoolers E1, E2 and E3 in series through a waste gas outlet pipe, the waste gas input end of the cooling system is connected with a tank VOC pipeline, the waste gas output end of the cooling system is connected with a chemical conversion adsorption system through a circulating compressor, and the three precoolers are sequentially connected in series through cold gas conveying pipes. The invention applies the integrated design, integrates cooling, gas-liquid separation, chemical conversion absorption, activated carbon adsorption and desorption recovery into a whole, brings great convenience to site construction and transportation, and ensures that the discharged air has no peculiar smell by applying a deodorization system and continuous operation of a plurality of adsorption beds through the integrated design, thereby completely reaching the emptying standard and the VOC purification efficiency is more than or equal to 96 percent.
Description
Technical Field
The embodiment of the invention relates to the field of waste gas VOC (volatile organic compound) treatment, in particular to a combined type industrial waste gas VOC treatment system and a process.
Background
The industrial waste gas treatment equipment is widely applied to various fields of manufacturing industry, chemical enterprises and the like, and industrial waste gas is directly discharged into the atmosphere without being treated, so that the pollution to the surrounding environment is inevitable, and the life of surrounding residents is influenced. With the increasing importance of the national protection of the environment in recent years, the environmental protection becomes an important basis for measuring the sustainable development of an enterprise.
The industrial waste gas (VOC) refers to a volatile organic compound that is a chemical substance having a boiling point of 250 ℃ or lower and that can undergo a photochemical reaction under irradiation of sunlight in the form of vapor at normal temperature and a saturated vapor pressure of more than 10Pa at room temperature. The following classes of VOCs predominate: 1. aromatic hydrocarbons. 2. Aliphatic hydrocarbons. 3. A halogenated hydrocarbon. 4. Alcohol, aldehyde, ketone, polyol compounds. 5. Ethers, phenols, epoxy compounds. 6. Ester, acid compound 7, amine and nitrile compound.
Since VOC is one of the important precursors of PM2.5, participates in oxidation reaction and forms ozone, damages the environment and harms human health, in 12 months in 2014, the environmental protection department issues a notification about a printing and development < comprehensive volatile organic compound remediation scheme in the petrochemical industry), and in 7 months in 2017, comprehensive remediation work in the national petrochemical industry is completely completed, and petrochemical enterprises in key areas are required to meet the requirements of special emission limit values according to regulations; building a national petrochemical industry VOC monitoring system; and all levels of environment protection administrative departments complete the verification of VOC emission in the petrochemical industry.
There are 8 existing VOC treatment technologies: 1. adsorption technology 2, absorption technology 3, condensation technology 4, membrane separation technology 5, combustion technology 6, biological filtration technology 7, plasma technology 8, photocatalytic oxidation technology; in the aspect of recovering VOC in China, the adsorption method is the most mature technology at present, is widely applied, and is used together with a condensation method to achieve the aim of economically and effectively recovering VOC.
However, in the prior art, when the waste gas treatment is carried out by adopting the combined adsorption and condensation process, the equipment installation such as adsorption and condensation is dispersed, and great inconvenience is brought to site construction and transportation.
Disclosure of Invention
Therefore, the embodiment of the invention provides a combined type industrial waste gas VOC treatment system and a process, which integrate cooling, gas-liquid separation, chemical conversion absorption, activated carbon adsorption and desorption recovery into a whole by applying an integrated design, bring great convenience for site construction and transportation, and solve the problems in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a combined industrial waste gas VOC treatment system and a process thereof comprise a cooling system, a gas-liquid separation system, a circulating compressor, a chemical conversion adsorption system, a physical adsorption system and a steam generation system;
the cooling system is formed by serially connecting and communicating three precoolers E1, E2 and E3 through a waste gas outlet pipe, the waste gas input end of the cooling system is connected with a tank VOC pipeline, the waste gas output end is connected with the chemical conversion adsorption system through a circulating compressor, the three precoolers are sequentially connected in series through a cold gas conveying pipe, the input end of the cold gas conveying pipe is connected with a liquid nitrogen skid-mounted storage tank, and the output end of the cold gas conveying pipe is sequentially connected with a nitrogen removal system and a low-temperature refrigerator and reflows to an output pipeline of the liquid nitrogen skid-mounted;
the gas-liquid separation system comprises two water separators, a falling film absorber and a low-temperature separator, wherein the waste gas outlet pipe connected among the three precoolers is connected with one water separator, the falling film absorber is arranged on a connecting pipeline between the water separator between the E2 precooler and the E3 precooler and the E3 precooler, and the low-temperature separator is arranged on a connecting pipeline between the E3 precooler and the circulating compressor;
the chemical conversion adsorption system is connected with the physical adsorption system through a pipeline, the steam input end of the physical adsorption system is connected with the steam generation system, the waste gas output end is connected with the air inlet input end of the cooling system through a return pipeline, and the physical adsorption system is connected with the oil-liquid separator.
Further, every precooler all includes waste gas import, exhaust outlet, refrigerant import and refrigerant export, the waste gas import passes through pipe connection jar ware VOC pipeline, waste gas exit linkage waste gas exit tube, refrigerant import and refrigerant export and air conditioning conveyer pipe end to end connection realize the series connection intercommunication between two adjacent precoolers.
Furthermore, the physical adsorption system comprises three activated carbon adsorption systems, the three activated carbon adsorption systems are connected with the output end of the chemical conversion adsorption system through pipelines, and a first electromagnetic valve is arranged on each pipeline.
Further, it is three the active carbon adsorption system includes active carbon adsorption jar, three-way pipe and exhaust gas detection probe, the active carbon adsorption jar inlet end passes through the pipeline and is connected with the chemical conversion adsorption system output, and the end connection three-way pipe of giving vent to anger, the entrance point internal fixation of three-way pipe sets up the exhaust gas detection probe, and two other exit ends are connected with No. two solenoid valves respectively, and an exit end lets in the atmosphere, and another exit end passes through return line and connects cooling system's the input end that admits air.
Further, whole system connection external processing unit, the waste gas detection probe passes through wireless module and is connected with the central processing unit input, central processing unit passes through relay control solenoid valve and No. two solenoid valves.
Further, the nitrogen removal system is specifically a nitrogen separator, and the chemical conversion adsorption system is specifically a chemical adsorption tank filled with chemical agents.
Furthermore, two the water separator and low temperature separator bottom all are equipped with the blow off pipe, the blow off pipe output that the water separator is connected passes through the dredge pump and is connected with sewage system, the blow off pipe output that the low temperature separator is connected passes through the dredge pump and is connected with the recovery storage tank.
The invention also provides a combined industrial waste gas VOC treatment process, which comprises the following specific treatment steps:
s1, firstly introducing steam and VOC output from a VOC pipeline of the tank into a cooling system, firstly carrying out primary cooling through an E1 precooler, carrying out gas-liquid separation through a water separator, carrying out secondary cooling on output waste gas through an E2 precooler, simultaneously carrying out gas-liquid separation through the water separator, discharging sewage separated by the two water separators into a sewage system for treatment, carrying out adsorption cooling on the steam and the VOC discharged by the E2 precooler through a falling film absorber, finally carrying out primary cooling through the E3 precooler, carrying out gas-liquid separation through a low-temperature separator, and discharging the separated sewage into a recovery storage tank for treatment;
s2, leading the gas with the moisture removed into a chemical conversion adsorption system through a circulating compressor, reacting with chemical agents in the chemical conversion adsorption system to remove toxic and odorous gases, and enabling the removed gas to enter a physical adsorption system;
s3, the gas is output by a chemical conversion adsorption system and then enters three active carbon adsorption systems respectively in three ways, the gas is output to a three-way pipe after being adsorbed and purified by an active carbon adsorption tank, a waste gas detection probe is used for detecting whether the gas reaches the emission standard, if the gas reaches the emission standard, the gas is directly discharged to the atmosphere, if the gas does not reach the emission standard, the gas is conveyed to the gas inlet end of a cooling system through a backflow pipeline, and the gas returns to the step S1 for secondary treatment;
and S4, when the activated carbon adsorption system is used for a period of time, the steam generation system works, the steam is blown back to enter three activated carbon adsorption tanks for clean regeneration, and after low-pressure steam desorption, oil and liquid are quickly separated through an oil-liquid separator.
Further, in step S1, the skid-mounted liquid nitrogen storage tank sequentially supplies liquid nitrogen to the three precoolers through the cold air delivery pipe, the liquid nitrogen vaporizes to absorb heat, so as to cool the steam passing through the precoolers, the gasified liquid nitrogen is separated into high-purity nitrogen through the nitrogen removal system, the nitrogen is liquefied into liquid nitrogen through the low-temperature refrigerator, and the liquid nitrogen flows back to the output pipeline of the skid-mounted liquid nitrogen storage tank and is refrigerated by the three precoolers again.
Further, in the step S3, the opening and closing of the first solenoid valve is controlled by the central processing unit, so that the cyclic use of three activated carbon adsorption systems can be realized, for example, one of the three activated carbon adsorption systems needs to be replaced by the other two activated carbon adsorption systems, which does not affect the use, and greatly improves the adsorption efficiency.
The embodiment of the invention has the following advantages:
1. the invention uses an integrated design, integrates cooling, gas-liquid separation, chemical conversion absorption, activated carbon adsorption and desorption recovery, and brings great convenience to site construction and transportation; the design of a plurality of activated carbon adsorption beds is adopted, and the adsorption and desorption are simultaneously and continuously operated, so that the adsorption efficiency is improved; oil-gas organic matters adsorbed by the active carbon can be quickly subjected to oil-liquid separation after being desorbed by low-pressure steam; through integrated design, a deodorization system and continuous operation of a plurality of adsorption beds are adopted, so that the discharged air is ensured to have no peculiar smell, the discharge standard is completely reached, and the VOC purification efficiency is more than or equal to 96 percent;
2. the invention can effectively remove sulfur-containing stink gases such as H2S and the like which are not easy to be absorbed by the active carbon in the VOC waste gas;
3. the invention can rapidly recover the adsorbed VOC, and the oil gas recovery rate is more than 95 percent;
4. the invention can continuously and efficiently carry out the adsorption operation, a plurality of adsorbers work simultaneously, the adsorption and desorption operations can be carried out simultaneously, and the treatment efficiency is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow diagram of an overall system provided by the present invention;
FIG. 2 is an overall process flow diagram provided by the present invention;
FIG. 3 is a block diagram of an activated carbon adsorption system provided by the present invention;
in the figure: the system comprises a cooling system 1, a precooler 11, a cold air delivery pipe 12, a liquid nitrogen skid-mounted storage tank 13, a nitrogen gas removal system 14, a cryogenic refrigerator 15, a gas-liquid separation system 2, a water separator 21, a falling film absorber 22, a cryogenic separator 23, a circulating compressor 3, a chemical conversion adsorption system 4, a physical adsorption system 5, an activated carbon adsorption system 51, an activated carbon adsorption tank 511, a three-way pipe 512, a waste gas detection probe 513, an electromagnetic valve 514 II, an electromagnetic valve 52I, a steam generation system 6, a VOC pipeline of a tank 7, an oil-liquid separator 8 and a return pipeline 9.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached fig. 1-3 of the specification, the combined industrial waste gas VOC treatment system of the embodiment includes a cooling system 1, a gas-liquid separation system 2, a recycle compressor 3, a chemical conversion adsorption system 4, a physical adsorption system 5 and a steam generation system 6;
the cooling system 1 is formed by serially communicating three precoolers 11 of E1, E2 and E3 through a waste gas outlet pipe, the waste gas input end of the cooling system 1 is connected with a tank VOC pipeline 7, the waste gas output end is connected with the chemical conversion adsorption system 4 through a circulating compressor 3, the three precoolers 11 are sequentially serially connected through a cold gas conveying pipe 12, the input end of the cold gas conveying pipe 12 is connected with a liquid nitrogen skid-mounted storage tank 13, and the output end of the cold gas conveying pipe 12 is sequentially connected with a nitrogen removal system 14 and a cryocooler 15 and reflows to an output pipeline of the liquid nitrogen skid-mounted storage tank 13;
the gas-liquid separation system 2 comprises two water separators 21, a falling film absorber 22 and a low-temperature separator 23, wherein the waste gas outlet pipes connected between the three precoolers 11 are respectively connected with one water separator 21, the falling film absorber 22 is arranged on a connecting pipeline between the E2 precooler 11 and the E3 precooler 11 and between the water separator 21 and the E3 precooler 11, and the low-temperature separator is arranged on a connecting pipeline between the E3 precooler 11 and the circulating compressor 3;
chemical conversion adsorption system 4 passes through pipe connection physical adsorption system 5, and steam generation system 6 is connected to the steam input of physical adsorption system 5, and the inlet air input of cooling system 1 is connected through backflow pipeline 9 to the waste gas output, oil and liquid separator 8 is connected to physical adsorption system 5.
Further, each precooler 11 all includes waste gas import, exhaust outlet, refrigerant import and refrigerant export, the waste gas import passes through pipe connection jar ware VOC pipeline 7, the waste gas exit linkage waste gas exit tube, refrigerant import and refrigerant export and cold air conveyer pipe 12 end to end connection realize the series connection intercommunication between two adjacent precoolers 11.
Further, the physical adsorption system 5 comprises three activated carbon adsorption systems 51, the three activated carbon adsorption systems 51 are connected with the output end of the chemical conversion adsorption system 4 through pipelines, and a first electromagnetic valve 52 is arranged on the pipeline.
Further, three activated carbon adsorption system 51 includes activated carbon adsorption jar 511, three-way pipe 512 and waste gas detection probe 513, activated carbon adsorption jar 511 inlet end passes through the pipeline and is connected with the 4 output ends of chemical conversion adsorption system, and the end connection three-way pipe 512 of giving vent to anger, the inlet end internal fixation of three-way pipe 512 sets up waste gas detection probe 513, and two other outlet ends are connected with No. two solenoid valves 514 respectively, and an outlet end lets in the atmosphere, and another outlet end passes through backflow pipeline 9 and connects cooling system 1's the input end of admitting air.
Further, the whole system is connected with an external central processing unit, the exhaust gas detection probe 513 is connected with the input end of the central processing unit through a wireless module, and the central processing unit controls the first electromagnetic valve 52 and the second electromagnetic valve 514 through relays.
Further, the nitrogen removal system 14 is embodied as a nitrogen separator.
Further, the chemical conversion adsorption system 4 is embodied as a chemical adsorption tank filled with chemical agents.
Further, two the separator 21 and the low temperature separator 23 bottom all are equipped with the blow off pipe, the blow off pipe output that separator 21 connects passes through the dredge pump and is connected with sewage system, the blow off pipe output that low temperature separator 23 connects passes through the dredge pump and is connected with the recovery storage tank.
The implementation scenario is specifically as follows: the invention uses the cooling system 1 and the gas-liquid separation system 2 in cooperation, the liquid nitrogen skid-mounted storage tank 13 is opened, the liquid nitrogen in the liquid nitrogen is taken as a first stage, a second stage and a third stage precooler for refrigeration, and then is circularly refrigerated through the refrigerator, the steam and VOC are subjected to multi-stage cooling and separation, the main function is to cool high-temperature gas and remove moisture and large particle impurities, the high-temperature steam and VOCs gas enter the chemical conversion adsorption system 4 after being cooled, the main function is to remove toxic and odorous gas (such as hydrogen sulfide), the chemical conversion system is provided with chemical agent gas which can react with the chemical agent gas to achieve the purpose of removal, the removed gas enters the physical adsorption system 5, the pretreated waste gas is finally treated by the activated carbon adsorption method and is discharged after reaching the standard, and finally, the activated carbon desorption can be carried out by the steam, oil liquid generated in the desorption process is operated and recovered by professional personnel.
Referring to the attached figures 2-3 of the specification, the invention also provides a combined industrial waste gas VOC treatment process, which comprises the following specific treatment steps:
s1, firstly introducing steam and VOC output from a tank VOC pipeline 7 into a cooling system 1, firstly primarily cooling through an E1 precooler 11, carrying out gas-liquid separation through a water separator 21, secondarily cooling output waste gas through the E2 precooler 11, simultaneously carrying out gas-liquid separation through the water separator 21, discharging sewage separated by the two water separators 21 into a sewage system for treatment, carrying out adsorption cooling on the steam and VOC discharged by the E2 precooler 11 through a falling film absorber 22, finally cooling for the last time through the E3 precooler 11, carrying out gas-liquid separation through a low-temperature separator 23, and discharging the separated sewage into a recovery storage tank for treatment;
s2, guiding the gas with the moisture removed into the chemical conversion adsorption system 4 through the circulating compressor 3, reacting with chemical agents in the chemical conversion adsorption system to remove toxic and odorous gases, and enabling the removed gas to enter the physical adsorption system 5;
s3, outputting the gas through the chemical conversion adsorption system 4, dividing the gas into three paths, respectively entering three activated carbon adsorption systems 51, adsorbing and purifying the gas through an activated carbon adsorption tank 511, outputting the gas into a three-way pipe 512, detecting whether the gas reaches the emission standard through a waste gas detection probe 513, if the gas reaches the emission standard, directly discharging the gas to the atmosphere, and if the gas does not reach the emission standard, conveying the gas to the gas inlet end of the cooling system 1 through a return pipeline 9, namely returning to the step S1 for retreatment;
s4, when the activated carbon adsorption system 51 is used for a period of time, the steam generation system 6 works, the steam enters the three activated carbon adsorption tanks 511 for clean regeneration in a back blowing mode, and after low-pressure steam desorption, oil and liquid are quickly separated through the oil-liquid separator 8.
Further, in step S1, the liquid nitrogen skid-mounted storage tank 13 sequentially supplies liquid nitrogen to the three precoolers 11 through the cold air delivery pipe 12, the liquid nitrogen vaporizes to absorb heat, so as to cool the steam in the precoolers 11, the gasified liquid nitrogen is separated into high-purity nitrogen through the nitrogen removal system 14, the nitrogen is liquefied into liquid nitrogen through the cryocooler 15, and the liquid nitrogen flows back to the output pipeline of the liquid nitrogen skid-mounted storage tank 13 to refrigerate the three precoolers 11 again, so that the cyclic refrigeration is realized, and the refrigeration efficiency is high.
Further, in the step S3, the central processing unit controls the on/off of the first electromagnetic valve 52, so that the three activated carbon adsorption systems 51 can be recycled, for example, one of the activated carbon adsorption systems needs to be replaced by the other two activated carbon adsorption systems, which does not affect the use, and greatly improves the adsorption efficiency.
The process adopts an integrated design, integrates cooling, gas-liquid separation, chemical conversion absorption, activated carbon adsorption and desorption recovery, and brings great convenience to site construction and transportation; the design of a plurality of activated carbon adsorption beds is adopted, and the adsorption and desorption are simultaneously and continuously operated, so that the adsorption efficiency is improved; oil-gas organic matters adsorbed by the active carbon can be quickly subjected to oil-liquid separation after being desorbed by low-pressure steam; through the integrated design, the deodorization system and the continuous operation of a plurality of adsorption beds are used, the discharged air is ensured to have no peculiar smell, the emptying standard is completely achieved, and the VOC purification efficiency is more than or equal to 96 percent.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a modular industrial waste gas VOC processing system which characterized in that: comprises a cooling system (1), a gas-liquid separation system (2), a circulating compressor (3), a chemical conversion adsorption system (4), a physical adsorption system (5) and a steam generation system (6);
the cooling system (1) is formed by serially communicating three precoolers (11) of E1, E2 and E3 through a waste gas outlet pipe, the waste gas input end of the cooling system (1) is connected with a tank VOC pipeline (7), the waste gas output end is connected with a chemical conversion adsorption system (4) through a circulating compressor (3), the three precoolers (11) are sequentially connected in series through a cold gas conveying pipe (12), the input end of the cold gas conveying pipe (12) is connected with a liquid nitrogen skid-mounted storage tank (13), and the output end of the cold gas conveying pipe is sequentially connected with a nitrogen removal system (14) and a cryogenic refrigerator (15) and reflows to an output pipeline of the liquid nitrogen skid-mounted storage tank (13);
the gas-liquid separation system (2) comprises two water separators (21), a falling film absorber (22) and a low-temperature separator (23), wherein an exhaust gas outlet pipe connected between the three precoolers (11) is connected with one water separator (21), the falling film absorber (22) is arranged on a connecting pipeline between the water separator (21) and the E3 precooler (11) between the E2 precooler (11) and the E3 precooler (11), and the low-temperature separator is arranged on a connecting pipeline between the E3 precooler (11) and the circulating compressor (3);
chemical conversion adsorption system (4) pass through pipe connection physical adsorption system (5), and steam generation system (6) is connected to the steam input of physical adsorption system (5), and the inlet air input of cooling system (1) is connected through backflow pipeline (9) to the waste gas output, oil and liquid separator (8) is connected in physical adsorption system (5).
2. The combined industrial waste gas VOC treatment system of claim 1, wherein: every precooler (11) all includes waste gas import, exhaust outlet, refrigerant import and refrigerant export, the waste gas import passes through pipe connection jar ware VOC pipeline (7), waste gas exit linkage waste gas exit tube, refrigerant import and refrigerant export and air conditioning conveyer pipe (12) end to end connection realize the series connection intercommunication between two adjacent precoolers (11).
3. The combined industrial waste gas VOC treatment system of claim 1, wherein: the physical adsorption system (5) comprises three active carbon adsorption systems (51), the three active carbon adsorption systems (51) are connected with the output end of the chemical conversion adsorption system (4) through pipelines, and a first electromagnetic valve (52) is arranged on the pipeline.
4. The combined industrial waste gas VOC treatment system of claim 3, wherein: it is three activated carbon adsorption system (51) includes activated carbon adsorption jar (511), three-way pipe (512) and waste gas detection probe (513), activated carbon adsorption jar (511) inlet end is connected with chemical conversion adsorption system (4) output through the pipeline, and three-way pipe (512) are connected to the end of giving vent to anger, the entrance point internal fixation of three-way pipe (512) sets up waste gas detection probe (513), and two other exit ends are connected with No. two solenoid valves (514) respectively, and an exit end lets in the atmosphere, and the inlet end of cooling system (1) is connected through backflow pipeline (9) to another exit end.
5. The combined industrial waste gas VOC treatment system of claim 4, wherein: the whole system is connected with an external central processing unit, the waste gas detection probe (513) is connected with the input end of the central processing unit through a wireless module, and the central processing unit controls the first electromagnetic valve (52) and the second electromagnetic valve (514) through a relay.
6. The combined industrial waste gas VOC treatment system of claim 1, wherein: the nitrogen removal system (14) is specifically a nitrogen separator, and the chemical conversion adsorption system (4) is specifically a chemical adsorption tank filled with chemical agents.
7. The combined industrial waste gas VOC treatment system of claim 1, wherein: two the blow off pipe all is equipped with to water separator (21) and low temperature separator (23) bottom, the blow off pipe output that water separator (21) are connected passes through the dredge pump and is connected with sewage system, the blow off pipe output that low temperature separator (23) are connected passes through the dredge pump and is connected with the recovery storage tank.
8. A process for the VOC treatment of exhaust gases using the modular industrial exhaust gas VOC treatment system of any of claims 1-8, wherein: the specific treatment steps are as follows:
s1, firstly introducing steam and VOC output from a tank VOC pipeline (7) into a cooling system (1), firstly primarily cooling through an E1 precooler (11), carrying out gas-liquid separation through a water separator (21), secondarily cooling output waste gas through the E2 precooler (11), simultaneously carrying out gas-liquid separation through the water separator (21), discharging the sewage separated by the two water separators (21) into a sewage system for treatment, adsorbing and cooling the steam and VOC discharged by the E2 precooler (11) through a falling film absorber (22), finally cooling through the E3 precooler (11) for the first time, carrying out gas-liquid separation through a low-temperature separator (23), and discharging the separated sewage into a recovery storage tank for treatment;
s2, guiding the gas with the moisture removed into a chemical conversion adsorption system (4) through a circulating compressor (3), reacting with chemical agents in the chemical conversion adsorption system to remove toxic and odorous gas, and enabling the removed gas to enter a physical adsorption system (5);
s3, outputting the gas by a chemical conversion adsorption system (4), dividing the gas into three paths, respectively entering three activated carbon adsorption systems (51), adsorbing and purifying the gas by an activated carbon adsorption tank (511), outputting the gas into a three-way pipe (512), detecting whether the gas reaches the emission standard by a waste gas detection probe (513), if so, directly discharging the gas to the atmosphere, if not, conveying the gas to the gas inlet input end of a cooling system (1) through a backflow pipeline (9), namely returning to the step S1 for retreatment;
s4, when the activated carbon adsorption system (51) is used for a period of time, the steam generation system (6) works, the steam enters the three activated carbon adsorption tanks (511) for clean regeneration in a back blowing mode, and after low-pressure steam desorption, oil and liquid separation is rapidly carried out through the oil-liquid separator (8).
9. The combined industrial waste gas VOC treatment process of claim 8, characterized in that: in the step S1, the liquid nitrogen skid-mounted storage tank (13) sequentially supplies liquid nitrogen to the three precoolers (11) through the cold air conveying pipe (12), the liquid nitrogen vaporizes to absorb heat, so that steam passing through the precoolers (11) is cooled, the gasified liquid nitrogen is separated into high-purity nitrogen through the nitrogen removal system (14), the nitrogen is liquefied into liquid nitrogen through the low-temperature refrigerator (15), and the liquid nitrogen flows back to the output pipeline of the liquid nitrogen skid-mounted storage tank (13) to refrigerate the three precoolers (11) again.
10. The combined industrial waste gas VOC treatment process of claim 8, characterized in that: in the step S3, the opening and closing of the first electromagnetic valve (52) is controlled by the central processing unit, so that the recycling of the three activated carbon adsorption systems (51) can be realized.
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