CN107441904B - Processing system for removing benzene series in petrochemical industrial waste gas - Google Patents
Processing system for removing benzene series in petrochemical industrial waste gas Download PDFInfo
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Abstract
The invention discloses a treatment system for removing benzene series in petrochemical industrial waste gas, which comprises a waste heat exchanger, a gas overheating protection device, a thermal gas mass flow meter, a mixed gas flow regulating valve, a bag type dust remover, a tungsten coil surface activation-ozone oxidation treatment device, a flue gas washing purification tower, an induced draft fan and the like. The system creatively utilizes the surface activation characteristic of ozone on the surface of certain metal simple substances, when the tungsten metal coil is in an electrified and glowing state, the ozone can quickly release activated oxygen atoms on the surface of the tungsten metal coil, a strong oxidation environment can be generated on the surface of the tungsten metal coil, when molecules containing conjugated effect C-C bonds such as benzene series and the like are in the strong oxidation environment, the conjugated C-C bonds can be broken by the activated oxygen atoms, and the benzene series molecules are finally oxidized and decomposed into H2O and CO2And inorganic molecules, thereby achieving the purpose of removing benzene series in the waste gas.
Description
Technical Field
The invention relates to a treatment system for removing benzene series in petrochemical industrial waste gas, and belongs to the field of waste gas treatment in environmental protection.
Background
The benzene series is a general term for benzene and its derivatives. The benzene series in the broad sense comprises all aromatic compounds, and the benzene series in the narrow sense particularly comprises benzene ring-containing compounds including BTEX which have certain distribution in the environment of human production and living and cause harm to human bodies.
The extraction of benzene series by human beings dates back to 19 th century at the earliest. In 1825, England scientist Faraday (Faraday) separated benzene with higher purity by distillation from the thermal cracking products of fish oil and the like, and measured the basic physical properties and chemical composition of benzene, which is called 'heavy carbon compounds of hydrogen'. Thereafter, toluene, xylene and the like were successively found and collectively named as benzene series. The industrial production of benzene-based compounds began in 1865 and was initially recovered from coal tar. With the expansion of the application, the yield is continuously increased, and the product becomes one of ten-tonnage products in the world by 1930. With the wide production and application of benzene series, the research on the pollution characteristics and toxicology of air gradually draws attention, and the monitoring and research on the benzene series pollution in the air become hot gradually before and after the last 70 th century.
Benzene series have serious negative effects on the area, especially the urban atmospheric environment. Most benzene series (such as benzene, toluene and the like) have strong volatility, and are easy to volatilize into gas at normal temperature to form volatile organic gases (VOCs), so that VOCs gas pollution is caused. For example, BTEX is widely used in the industries of paint, degreasing, dry cleaning, printing, textile, synthetic rubber, etc., as an organic solvent frequently used in the industry. The air pollution is caused by volatilization in the processes of production, storage and transportation and use of BTEX. BTEX has higher photochemical reaction activity in the atmosphere and has a considerable effect on the formation of photo-oxidants (such as ozone, peroxyacetyl nitrate and the like) and secondary organic aerosol in the atmosphere.
The benzene series pollution is mainly from a fixed source and a mobile source. The mobile source mainly comprises the exhaust gas of vehicles taking petroleum products as fuel, such as automobiles, ships, airplanes and the like; the stationary sources are very diverse and are mainly effluents of petrochemical processes and storage facilities, and various applications using organic solvents, such as painting, printing, metal degreasing and degreasing, adhesives, pharmaceuticals, plastics, coatings, and rubber processing.
According to different production process flows and different waste gas discharge modes, benzene series substances have different control technologies. Currently, widely adopted and studied are: adsorption, thermal destruction, condensation, absorption, and the like, and new control techniques developed in recent years include: biofilm method, photodecomposition method, plasma decomposition method, ozone decomposition method, and the like.
(1) An adsorption method:
the process of treating a fluid mixture with a porous solid to concentrate one or more components contained therein on the surface of the solid and to separate from the other components is known as adsorption. The adsorption method is mainly used for purifying low-concentration high-flux benzene series.
(2) Thermal destruction method:
the thermal destruction method is a benzene series treatment method which is widely applied and researched at present, and is particularly suitable for waste gas containing low-concentration benzene series. The process can be divided into direct flame combustion and catalytic combustion, which is a complex process and may involve a series of decomposition, polymerization and radical reactions. The most important mechanisms of the benzene series thermal destruction method include oxidation, thermal cracking and thermal decomposition, and the thermal destruction method is based on the mechanisms.
(3) Condensation method:
the condensation method is a process of condensing benzene series in a steam state and separating the benzene series from waste gas by utilizing the property that substances have different saturated vapor pressures at different temperatures and reducing the system temperature or increasing the system pressure.
(4) Absorption method:
the absorption method mainly utilizes the characteristic that benzene series can be mutually dissolved with most of oil substances, oil with high boiling point and low vapor pressure is used as an absorbent to absorb the benzene series in the waste gas, and a common absorber is a filler washing absorption tower.
(5) A biofilm method:
the biofilm method is to fix and attach microorganisms on the surface of the porous medium filler, and carry out biological treatment on polluted gas in a filler bed layer to remove pollutants in the porous medium filler and degrade the polluted gas in gaps. Volatile organic contaminants are adsorbed on the surface of the voids, consumed by the microorganisms in the voids, and degraded to CO2、H2O and a neutral salt.
At present, the benzene series treatment method of waste gas commonly adopted in China generally has the defects of large initial investment, high operation and maintenance cost, complex technology and the like, and the treatment effect of the benzene series treatment method is difficult to meet the increasingly strict emission requirement. For this reason, new methods and approaches are sought to solve this problem.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a treatment system for removing benzene series in petrochemical industrial waste gas, which comprises a waste heat exchanger, a gas overheating protection device, a thermal gas mass flow meter, a mixed gas flow regulating valve, a cloth bag type dust remover, a tungsten coil surface activation-ozoneAn oxidation treatment device, a flue gas washing purification tower, an induced draft fan and the like; wherein, the petrochemical industry waste gas containing benzene series enters a waste heat exchanger through a gas pipeline, the superheated waste gas is cooled and stabilized through the heat exchange effect, the obtained residual heat can be used, the outlet of the waste heat exchanger is connected with a gas overheating protection device through the gas pipeline, the function is that when the waste heat exchanger fails or the temperature of the waste gas after heat exchange is still overhigh, the gas circuit can be temporarily cut off, the function of protecting a rear end processing device is achieved, the outlet of the gas overheating protection device is connected with a thermal gas mass flowmeter through the gas pipeline, the information such as the flow rate and the flow velocity of the waste gas can be monitored and recorded in real time, the outlet of the thermal gas mass flowmeter is connected with a mixed gas flow regulating valve through the gas pipeline, the actual concentration of the benzene series in the waste gas is regulated through a method of leading in air, and the waste gas is accurately diluted and cooled, the outlet of the mixed gas flow regulating valve is connected with a bag type dust collector through a gas pipeline, particle pollutants in waste gas are removed, abrasion or blockage of a rear-end processing device is prevented, the outlet of the bag type dust collector is connected with a tungsten coil surface activation-ozone oxidation processing device through a gas pipeline, the outlet of the tungsten coil surface activation-ozone oxidation processing device is connected with a flue gas washing purification tower through a gas pipeline, the processed waste gas is further washed, purified and cooled, the outlet of the flue gas washing purification tower is connected with an induced draft fan through a gas pipeline, and the outlet of the induced draft fan is communicated with the atmospheric environment through a gas pipeline; the device comprises a tungsten coil surface activation-ozone oxidation treatment device, an ozone generator, a nitrogen storage tank, an air inlet valve, a gas premixing four-way valve, a mixed gas nozzle, 1 set of metal tungsten coil, an exhaust valve, a gas pipeline, a gas premixing reaction zone, an air inlet valve, an ultrafine filter screen, an ozone generator, a nitrogen gas pipeline, a gas premixing four-way valve, a mixed gas nozzle, 1 set of metal tungsten coil, 1 set of stabilized voltage power supply and an exhaust valve, wherein the tungsten coil surface activation-ozone oxidation treatment device consists of the two parts of the gas premixing zone and the oxidation reaction zone; benzene series-containing petrochemical industrial waste gas passes through the surface of the tungsten coilAn air inlet valve at the bottom of the activation-ozone oxidation treatment device enters the treatment device, the air enters a gas premixing four-way valve after being finely filtered by a superfine filter screen to thoroughly remove particle impurities, meanwhile, ozone gas generated by an ozone generator and nitrogen supplied by a nitrogen storage tank also enter the gas premixing four-way valve, and waste gas to be treated, ozone and nitrogen enter the gas premixing four-way valve according to a preset volume ratio (waste gas, O)3、N2The proportions of the carbon dioxide and the oxygen are respectively 28.7 percent, 31.1 percent and 40.2 percent), the uniformly mixed gas is uniformly sprayed to the metal tungsten coil through a mixed gas spray head, the metal tungsten coil enters an electrified and glowing state under the power supply of a stabilized voltage power supply, at the moment, ozone in the mixed gas quickly releases activated oxygen atoms on the surface of the metal tungsten coil, a strong oxidation environment is locally generated, when benzene series molecules containing conjugate effect C-C bonds in waste gas are in the strong oxidation environment, the conjugate C-C bonds can be broken by the activated oxygen atoms, and the benzene series molecules are finally oxidized and decomposed into H2O and CO2And inorganic molecules are added, so that the aim of removing benzene series in the waste gas is fulfilled, the purified waste gas is discharged from an exhaust valve at the top of the device, and the waste gas enters the next treatment process. Wherein, because benzene series is combustible substance, and the ozone will form combustion improver-oxygen after releasing oxygen atom, there is danger of explosion after mixing the two, therefore mix nitrogen gas as shielding gas into the waste gas in advance, can play the explosion-proof role.
Wherein the working pressure range of the tungsten coil surface activation-ozone oxidation treatment device is 0.055-0.75 MPa, the working temperature range is 250-700 ℃, and the effective volume is 230m3。
In the surface activation-ozone oxidation treatment device for the tungsten coil, the surface temperature of the metal tungsten coil during working is about 2600 ℃, the working voltage is 380V, and the tungsten content is more than 99.95 percent.
The gas premixing four-way valve of the tungsten coil surface activation-ozone oxidation treatment device adopts a three-in one-out structure, the maximum pressure bearing is 1.05MPa, and the working temperature range is 105-850 ℃.
The removal efficiency of benzene series in the waste gas treated by the system can reach 99.6%.
The invention has the advantages that:
(1) the system gets rid of the treatment mode of benzene series in the existing petrochemical industry waste gas, creatively utilizes the surface activation characteristic of ozone on the surface of certain metal simple substances, when a tungsten metal coil is in an electrified and glowing state, the ozone can quickly release activated oxygen atoms on the surface of the tungsten metal coil, a strong oxidation environment can be generated on the surface of the tungsten metal coil, and when molecules containing conjugate effect C-C bonds such as benzene series and the like are in the strong oxidation environment, the conjugate C-C bonds can be broken by the activated oxygen atoms and finally are oxidized and decomposed into H2O and CO2And the like. The method has good oxidative decomposition effect on benzene series substances, is a very targeted treatment method, and has the treatment efficiency of 98.9 percent.
(2) The system does not use any chemical agent in the operation process, so that the cost for purchasing and processing materials is greatly reduced, and the risk of introducing more harmful pollutants is avoided.
(3) The system applies a plurality of gas premixing technologies, can realize the uniform premixing of reaction materials, and greatly improves the reaction efficiency.
(4) As the benzene series is combustible, the ozone can form combustion improver-oxygen after releasing oxygen atoms, and the mixture of the two has the danger of explosion. Therefore, the system particularly uses nitrogen as shielding gas, so that the explosion risk can be effectively eliminated.
(5) The system has advanced technical route, small occupied area of equipment, good treatment effect and low operation and maintenance cost, and is favorable for large-scale popularization and application.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
In the figure: 1-waste heat exchanger, 2-gas overheating protection device, 3-thermal gas mass flowmeter, 4-mixed gas flow regulating valve, 5-bag type dust remover, 6-tungsten coil surface activation-ozone oxidation treatment device, 7-flue gas washing purification tower and 8-induced draft fan
FIG. 2 is a schematic view of a tungsten coil surface activation-ozonation treatment apparatus.
61-air inlet valve, 62-superfine filter screen, 63-gas premixing four-way valve, 64-ozone generator, 65-nitrogen storage tank, 66-mixed gas nozzle, 67-metal tungsten coil, 68-stabilized power supply and 69-exhaust valve.
Detailed Description
As shown in fig. 1, the system for removing benzene series in petrochemical industrial waste gas comprises a waste heat exchanger 1, a gas overheating protection device 2, a thermal gas mass flow meter 3, a mixed gas flow regulating valve 4, a bag type dust collector 5, a tungsten coil surface activation-ozone oxidation treatment device 6, a flue gas washing purification tower 7, an induced draft fan 8 and the like; wherein, the petrochemical industry waste gas containing benzene series enters the waste heat exchanger 1 through the gas pipeline, the overheated waste gas is cooled and stabilized through the heat exchange effect, and the obtained residual heat can be used, the outlet of the waste heat exchanger 1 is connected with the gas overheating protection device 2 through the gas pipeline, the function is that when the waste heat exchanger 1 is in failure or the temperature of the waste gas after heat exchange is still overhigh, the gas circuit can be cut off temporarily, the function of protecting the rear end processing device is achieved, the outlet of the gas overheating protection device 2 is connected with the thermal gas mass flowmeter 3 through the gas pipeline, the information such as the waste gas flow and the flow speed can be monitored and recorded in real time, the outlet of the thermal gas mass flowmeter 3 is connected with the mixed gas flow regulating valve 4 through the gas pipeline, the actual concentration of the benzene series in the waste gas is regulated through the method of leading in air, and the waste gas is diluted and cooled accurately, the outlet of the mixed gas flow regulating valve 4 is connected with a bag type dust collector 5 through a gas pipeline, particle pollutants in waste gas are removed at the outlet, the abrasion is prevented or a rear-end processing device is blocked, the outlet of the bag type dust collector 5 is connected with a tungsten coil surface activation-ozone oxidation processing device 6 through a gas pipeline, the outlet of the tungsten coil surface activation-ozone oxidation processing device 6 is connected with a flue gas washing purification tower 7 through a gas pipeline, the treated waste gas is further washed, purified and cooled at the outlet, the outlet of the flue gas washing purification tower 7 is connected with an induced draft fan 8 through a gas pipeline, and the outlet of the induced draft fan 8 is connected with an induced draft fan 8 through a gas pipelineThe path is communicated with the atmospheric environment; the tungsten coil surface activation-ozone oxidation treatment device 6 comprises a gas premixing area and an oxidation reaction area, wherein the bottom of the device is provided with an air inlet valve 61, the rear end of the air inlet valve 61 is connected to an ultrafine filter screen 62 through a gas pipeline, the rear end of the ultrafine filter screen 62 is connected to a gas premixing four-way valve 63 through a gas pipeline, meanwhile, an ozone generator 64 and a nitrogen storage tank 65 are also respectively connected to the gas premixing four-way valve 63 through gas pipelines, the outlet end of the gas premixing four-way valve 63 is connected to a mixed gas nozzle 66 through a gas pipeline, 1 set of metal tungsten coil 67 is installed above the mixed gas nozzle 66, the metal tungsten coil 67 is powered by 1 stabilized voltage power supply 68 positioned outside the device, and the top of the device is provided with; the benzene series-containing petrochemical industry waste gas enters the inside of the treatment device through an air inlet valve 61 at the bottom of the tungsten coil surface activation-ozone oxidation treatment device 6, after particle impurities are thoroughly removed through fine filtration of a superfine filter screen 62, the benzene series-containing petrochemical industry waste gas enters a gas premixing four-way valve 63, simultaneously, ozone gas generated by an ozone generator 64 and nitrogen supplied by a nitrogen storage tank 65 also enter the gas premixing four-way valve 63, and the waste gas to be treated, the ozone and the nitrogen enter the gas premixing four-way valve 63 according to preset volume proportions (waste gas, O3、N2The proportions of the components are respectively 28.7%, 31.1% and 40.2%), the uniformly mixed gas is uniformly sprayed to the metal tungsten coil 67 through the mixed gas spray head 66, the metal tungsten coil 67 enters an electrified and glowing state under the power supply of the stabilized voltage power supply 68, at the moment, ozone in the mixed gas quickly releases activated oxygen atoms on the surface of the metal tungsten coil 67, a strong oxidation environment is locally generated, when benzene series molecules containing conjugate effect C-C bonds in the waste gas are in the strong oxidation environment, the conjugate C-C bonds can be broken by the activated oxygen atoms, and the benzene series molecules are finally oxidized and decomposed into H2O and CO2And inorganic molecules are added, so that the aim of removing benzene series in the waste gas is fulfilled, the purified waste gas is discharged from an exhaust valve 69 at the top of the device, and the waste gas enters the next treatment process. Wherein, because benzene series is combustible substance, and the ozone will form combustion improver-oxygen after releasing oxygen atom, there is danger of explosion after mixing the two, therefore mix into the waste gas in advanceThe nitrogen is used as shielding gas, so that an explosion-proof effect can be achieved; wherein the working pressure range of the tungsten coil surface activation-ozone oxidation treatment device 6 is 0.055-0.75 MPa, the working temperature range is 250-700 ℃, and the effective volume is 230m3(ii) a Wherein, in the tungsten coil surface activation-ozone oxidation treatment device 6, the surface temperature of the metal tungsten coil 67 during working is about 2600 ℃, the working voltage is 380V, and the tungsten content is more than 99.95 percent; wherein, the tungsten coil surface activation-ozone oxidation treatment device 6 has a gas premixing four-way valve 63 with a three-in one-out structure, the maximum pressure bearing is 1.05MPa, and the working temperature range is 105-850 ℃.
The removal efficiency of benzene series in the waste gas treated by the system can reach 99.6%.
Claims (3)
1. A processing system for removing benzene series in petrochemical industrial waste gas is characterized by comprising a waste heat exchanger, a gas overheating protection device, a thermal gas mass flow meter, a mixed gas flow regulating valve, a bag type dust remover, a tungsten coil surface activation-ozone oxidation processing device, a flue gas washing purification tower and an induced draft fan; the petrochemical industrial waste gas containing benzene series enters a waste heat exchanger through a gas pipeline, the outlet of the waste heat exchanger is connected with a gas overheating protection device through a gas pipeline, the outlet of the gas overheating protection device is connected with a hot gas mass flow meter through a gas pipeline, the outlet of the hot gas mass flow meter is connected with a mixed gas flow regulating valve through a gas pipeline, the outlet of the mixed gas flow regulating valve is connected with a bag-type dust collector through a gas pipeline, the outlet of the bag-type dust collector is connected with a tungsten coil surface activation-ozone oxidation treatment device through a gas pipeline, the outlet of the tungsten coil surface activation-ozone oxidation treatment device is connected with a flue gas washing purification tower through a gas pipeline, the outlet of the flue gas washing purification tower is connected with a draught fan through a gas pipeline, and the outlet of the draught fan is communicated with; the device comprises a tungsten coil surface activation-ozone oxidation treatment device, an ozone generator, a nitrogen storage tank, an air inlet valve, a gas premixing four-way valve, a mixed gas nozzle, 1 set of metal tungsten coil, an exhaust valve, a gas pipeline, a gas premixing reaction zone, an air inlet valve, an ultrafine filter screen, an ozone generator, a nitrogen gas pipeline, a gas premixing four-way valve, a mixed gas nozzle, 1 set of metal tungsten coil, 1 set of stabilized voltage power supply and an exhaust valve, wherein the tungsten coil surface activation-ozone oxidation treatment device consists of the two parts of the gas premixing zone and the oxidation reaction zone;
the surface temperature of a metal tungsten coil of the tungsten coil surface activation-ozonation treatment device during working is 2600 ℃, the working voltage is 380V, the tungsten content is more than 99.95 percent, a gas premixing four-way valve of the tungsten coil surface activation-ozonation treatment device adopts a three-in one-out structure, the maximum pressure bearing is 1.05MPa, and the working temperature range is 105-850 ℃.
2. The treatment system for removing the benzene series in the petrochemical industry waste gas according to claim 1, wherein the tungsten coil surface activation-ozonation treatment device consists of a gas premixing area and an oxidation reaction area, and comprises an air inlet valve, an ultrafine filter screen, a gas premixing four-way valve, an ozone generator, a nitrogen storage tank, a mixed gas nozzle, a metal tungsten coil, a stabilized voltage power supply and an exhaust valve; the bottom of the tungsten coil surface activation-ozone oxidation treatment device is provided with an air inlet valve, the rear end of the air inlet valve is connected to a superfine filter screen through a gas pipeline, the rear end of the superfine filter screen is connected to a gas premixing four-way valve through a gas pipeline, an ozone generator and a nitrogen storage tank are also respectively connected to the gas premixing four-way valve through gas pipelines, the outlet end of the gas premixing four-way valve is connected to a mixed gas nozzle in an oxidation reaction area through a gas pipeline, 1 set of metal tungsten coil is installed above the mixed gas nozzle in the oxidation reaction area, the metal tungsten coil is powered by 1 part of stabilized voltage power supply located outside the oxidation reaction area, and the top of the.
3. The system of claim 1, wherein the benzene-containing waste gas enters the inside of the treatment device through an inlet valve at the bottom of the tungsten coil surface activation-ozonation treatment device, after being finely filtered by an ultrafine filter screen to completely remove particulate impurities, the waste gas enters the gas premixing four-way valve, and simultaneously ozone gas generated by an ozone generator and nitrogen gas supplied from a nitrogen gas storage tank also enter the gas premixing four-way valve, the waste gas to be treated, ozone and nitrogen gas are fully mixed in the gas premixing four-way valve according to a preset volume ratio, the uniformly mixed gas is uniformly sprayed to the metal tungsten coil through the mixed gas nozzle, the metal tungsten coil enters an electrified hot state under the power supply of a regulated power supply, and at the moment, ozone in the mixed gas rapidly releases activated oxygen atoms on the surface of the metal tungsten coil, and a strong oxidation environment is locally generated, when benzene series molecules containing conjugate effect C-C bonds in the waste gas are in the strong oxidation environment, the conjugate C-C bonds can be broken by activated oxygen atoms, and the benzene series molecules are finally oxidized and decomposed into H2O and CO2, so that the aim of removing the benzene series in the waste gas is fulfilled, and the purified waste gas is discharged from an exhaust valve at the top of the device and enters the next treatment process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710929300.1A CN107441904B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical industrial waste gas |
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| CN201710929308.8A Active CN107441905B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical industrial waste gas |
| CN201710929310.5A Active CN107441911B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical waste gas |
| CN201610555324.0A Active CN106110809B (en) | 2016-07-15 | 2016-07-15 | A kind of processing system for removing benzene homologues in petrochemical industry waste gas |
| CN201710930126.2A Active CN107469601B (en) | 2016-07-15 | 2016-07-15 | A kind of processing system removing benzene homologues in petrochemical industry exhaust gas |
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| CN201710929668.8A Active CN107511044B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical industrial waste gas |
| CN201710929308.8A Active CN107441905B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical industrial waste gas |
| CN201710929310.5A Active CN107441911B (en) | 2016-07-15 | 2016-07-15 | Processing system for removing benzene series in petrochemical waste gas |
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| CN106178879B (en) * | 2016-07-15 | 2018-11-06 | 缪琼华 | A kind of tungsten wire circle surface active-ozone Oxidation Treatment device removing benzene homologues in removing exhaust gas |
| CN107511043B (en) * | 2016-07-15 | 2018-09-28 | 缪琼华 | A kind of processing system removing benzene homologues in petrochemical industry exhaust gas |
| CN106621743A (en) * | 2017-01-20 | 2017-05-10 | 杭州启澄科技有限公司 | Treatment method for purifying industrial waste gas |
| CN106621774A (en) * | 2017-01-20 | 2017-05-10 | 杭州启澄科技有限公司 | Treatment method for purifying industrial waste gas |
| CN106621802A (en) * | 2017-01-20 | 2017-05-10 | 杭州启澄科技有限公司 | Treatment system for purifying industrial waste gas |
| CN109876661A (en) * | 2017-01-20 | 2019-06-14 | 杭州启澄科技有限公司 | A kind of processing system of purifying industrial waste gases |
| CN111135672A (en) * | 2019-01-06 | 2020-05-12 | 史光辉 | Environmental protection treatment process for tar smoke |
| CN109758890A (en) * | 2019-03-18 | 2019-05-17 | 西原环保工程(上海)有限公司 | Grease emission-control equipment |
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Also Published As
| Publication number | Publication date |
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| CN107469601A (en) | 2017-12-15 |
| CN107511044B (en) | 2020-06-16 |
| CN107511043B (en) | 2018-09-28 |
| CN107441905A (en) | 2017-12-08 |
| CN107511043A (en) | 2017-12-26 |
| CN107469601B (en) | 2018-08-07 |
| CN107441911A (en) | 2017-12-08 |
| CN106110809B (en) | 2018-01-23 |
| CN107511044A (en) | 2017-12-26 |
| CN107441905B (en) | 2020-06-16 |
| CN107441911B (en) | 2020-06-12 |
| CN106110809A (en) | 2016-11-16 |
| CN107441904A (en) | 2017-12-08 |
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