CN107281933B - High concentration organic waste gas treatment system - Google Patents
High concentration organic waste gas treatment system Download PDFInfo
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- CN107281933B CN107281933B CN201710692950.9A CN201710692950A CN107281933B CN 107281933 B CN107281933 B CN 107281933B CN 201710692950 A CN201710692950 A CN 201710692950A CN 107281933 B CN107281933 B CN 107281933B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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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
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Abstract
The invention discloses a high-concentration organic waste gas treatment system, and relates to the technical field of waste gas treatment in the pharmaceutical industry. The method comprises the following steps: the waste gas directly enters the heat exchange type CO device through a pipeline to be subjected to oxidative decomposition of high-concentration organic waste gas, the decomposed high-temperature gas enters the molecular sieve adsorption and desorption device through the water cooler, and the adsorbed gas is directly discharged. The molecular sieve desorption air adopts high-temperature gas at a heat exchange type CO gas outlet, the desorption gas is returned to the front end of the heat exchange type CO device, and oxidation treatment is continued to form a local closed loop state; the molecular sieve cooling air utilizes normal temperature air, and the cooled gas is still conveyed to the front end of the heat exchange type CO. The whole treatment system has the advantages of strong flexibility, excellent purification effect, full utilization of heat, low standard emission and optimal equipment investment in treating the organic waste gas with high concentration.
Description
Technical Field
The invention relates to the technical field of waste gas treatment in the pharmaceutical industry, in particular to a high-concentration organic waste gas treatment system.
background
the pharmaceutical industry in China is a major environment pollution household, wherein the waste gas has complex components, serious pollution hazard and irregular waste gas emission, so that the development of a waste gas treatment system with strong adaptability is particularly critical in the field of waste gas treatment in the pharmaceutical industry.
in recent years, molecular sieve adsorption concentration devices and catalytic oxidation devices are favored by the exhaust gas treatment industry. The adsorption and concentration principle of the molecular sieve is as follows: the three continuous programmed processes of adsorption, high temperature desorption concentration, cooling and re-adsorption and temperature swing adsorption and desorption are utilized to concentrate low concentration organic waste gas into high concentration waste gas.
The principle of the heat exchange catalytic oxidation device (heat exchange type CO device) is as follows: organic pollutants in the waste gas such as benzene, ketone, ester, phenol, aldehyde, alcohol, ether, hydrocarbon and the like are heated and oxidized to be decomposed into small molecular compounds such as CO2, H2O and the like. At present, all catalytic oxidation treatment devices are provided with waste heat recovery modules for preheating subsequently entering organic waste gas, thereby saving the energy consumption of waste gas heating.
based on the characteristics of the molecular sieve adsorption concentration device and the catalytic oxidation device, a stable and efficient molecular sieve adsorption concentration and oxidative decomposition combined treatment process is preferred for treating organic waste gas with lower concentration, for example, patent CN 205850524U-catalytic combustion device after waste gas adsorption concentration; for the treatment of organic waste gas with higher concentration, one or more stages of high-temperature oxidation treatment equipment is generally directly selected, for example, chinese patent CN 203208897U-a regenerative catalytic oxidation furnace, and the process has the following disadvantages: because the removal efficiency of the catalytic oxidation device is 95-97%, when the working condition concentration of the waste gas is high and the single-stage catalytic oxidation device cannot meet the low emission standard (not more than 20mg/m3), multistage high-temperature oxidation device equipment is inevitably adopted, and the multistage treatment equipment is adopted, so that the investment and the operating cost of the whole process equipment are very high, and the treatment efficiency is also greatly reduced (especially, the energy consumption of the second-stage treatment device is very high).
Accordingly, the present invention is directed to a system for treating organic waste gas with high concentration optimized to overcome the disadvantages and drawbacks of the prior art.
Disclosure of Invention
It is an object of the present invention to provide a high concentration organic waste gas treatment system, thereby solving the aforementioned problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
A high concentration organic waste gas treatment system comprises the following components connected in sequence: the device comprises a heat exchange type CO device, a water cooler and a molecular sieve adsorption and desorption device, wherein the heat exchange type CO device is used for carrying out primary treatment on waste gas, the molecular sieve adsorption and desorption device is used for carrying out secondary treatment on the waste gas, and the heat exchange type CO device is combined with the molecular sieve adsorption and desorption device to ensure the low-standard emission of the waste gas;
the molecular sieve adsorption and desorption device comprises an adsorption area, a cooling area and a desorption area;
The air inlet of the water cooler is connected with the air outlet of the heat exchange type CO device, the air outlet of the water cooler is connected with the air inlet of the adsorption area, and the air outlet of the adsorption area is connected with the chimney;
the gas inlet of the desorption area is connected with the gas outlet of the heat exchange type CO device, and the gas outlet of the desorption area is connected with the gas inlet of the heat exchange type CO device;
And the exhaust port of the cooling area is connected with the air inlet of the heat exchange type CO device.
preferably, the exhaust port of the heat-exchanging CO device is connected with the air inlet of the heat-exchanging CO device.
preferably, still include four draught fans, wherein, one the draught fan with the gas vent of adsorption zone communicates with each other, one the draught fan with the gas vent of desorption zone communicates with each other, one the draught fan with the gas vent of cooling space communicates with each other, one the draught fan with the gas vent of heat transfer formula CO device communicates with each other.
Preferably, the heat exchange type CO device comprises a multistage preheating heat exchanger, a catalytic oxidation chamber and a heating chamber which are connected in sequence, and an exhaust port of the heating chamber is connected with an air inlet of the multistage preheating heat exchanger.
Preferably, the water cooler comprises a heat transfer zone and a dehumidification zone, and the gas enters from an air inlet of the cooler, passes through the heat transfer zone first, then passes through the dehumidification zone, and finally exits from an air outlet of the cooler.
The invention has the beneficial effects that: the embodiment of the invention provides a high-concentration organic waste gas treatment system, which comprises: the waste gas directly enters the heat exchange type CO device through a pipeline to be subjected to oxidative decomposition of high-concentration organic waste gas, the decomposed high-temperature gas enters the molecular sieve adsorption and desorption device through the water cooler, and the adsorbed gas is directly discharged. The molecular sieve desorption air adopts high-temperature gas at a heat exchange type CO gas outlet, the desorption gas is returned to the front end of the heat exchange type CO device, and oxidation treatment is continued to form a local closed loop state; the molecular sieve cooling air utilizes normal temperature air, and the cooled gas is still conveyed to the front end of the heat exchange type CO. The whole treatment system has the advantages of strong flexibility, excellent purification effect, full utilization of heat, low standard emission and optimal equipment investment in treating the organic waste gas with high concentration.
Drawings
FIG. 1 is a schematic view of the piping connection of a high concentration organic waste gas treatment system.
In the figure, the meaning of each symbol is as follows:
1-original organic waste gas, 2-1-air inlet pipe, 2-2-high-temperature gas return pipe, 2-3-water cooling pipe, 2-4-adsorption exhaust pipe, 2-5-air cooling pipe, 2-6-desorption pipe, 3-heat exchange type CO furnace, 3-1-multi-stage preheating heat exchanger, 3-2-catalytic oxidation chamber, 3-3-heating chamber, 4-No. 1 fan, 5-water cooler, 5-1-heat exchange zone, 5-2-dehumidification zone, 6-molecular sieve adsorption-desorption device, 6-1-adsorption zone, 6-2-cooling zone, 6-3- -desorption zone, 7- -No. 2 blower, 8- -No. 3 blower, 9- -No. 4 blower, 10- -chimney.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a high-concentration organic waste gas treatment system, which comprises the following components in sequential connection: the device comprises a heat exchange type CO device, a water cooler and a molecular sieve adsorption and desorption device, wherein the heat exchange type CO device is used for carrying out primary treatment on waste gas, the molecular sieve adsorption and desorption device is used for carrying out secondary treatment on the waste gas, and the heat exchange type CO device is combined with the molecular sieve adsorption and desorption device to ensure the low-standard emission of the waste gas;
The molecular sieve adsorption and desorption device comprises an adsorption area, a cooling area and a desorption area;
The air inlet of the water cooler is connected with the air outlet of the heat exchange type CO device, the air outlet of the water cooler is connected with the air inlet of the adsorption area, and the air outlet of the adsorption area is connected with the chimney;
the gas inlet of the desorption area is connected with the gas outlet of the heat exchange type CO device, and the gas outlet of the desorption area is connected with the gas inlet of the heat exchange type CO device;
And the exhaust port of the cooling area is connected with the air inlet of the heat exchange type CO device.
The working principle of the processing system with the structure is as follows:
The high-concentration organic waste gas of original emission gets into heat transfer formula CO stove through the tuber pipe, preheats the heat exchanger by the multistage preheating in bottom and preheats, gets into catalytic oxidation stove afterwards, and most organic molecules are after oxidative decomposition, through multistage preheating the heat exchanger again, carry out heat recovery, and the exhaust of CO stove is carried to gas reflux and water cooling pipeline.
the water cooler is internally provided with two units of heat exchange and dehumidification, gas enters from a gas inlet of the cooler, firstly passes through the heat exchange area, then passes through the dehumidification area, and finally is discharged from a gas outlet of the cooler, so that most of water is removed while the gas passing through the water cooler is cooled, and the gas outlet of the water cooler is connected with an adsorption area of the molecular sieve adsorption and desorption device. Directly discharging the adsorbed clean gas to a chimney; the desorption gas comes from a high-temperature return pipe of a heat exchange type CO gas outlet, and the desorption gas carrying the high-concentration organic solvent returns to a gas inlet of the CO furnace for catalytic oxidation decomposition again; the cooling air of the molecular sieve adsorption and desorption device is normal temperature air and is conveyed to the front end of the CO furnace through negative pressure of a fan, the cooling air carries a small amount of organic solvent, the organic solvent is degraded by the CO furnace, and pressure is not brought to exhaust concentration.
in addition, a large amount of water is generated by oxidative decomposition of the heat exchange type CO furnace, so that the capability of the molecular sieve for adsorbing organic matters is reduced, and therefore, the water cooler is an indispensable pretreatment module on the premise of ensuring the efficient operation of the molecular sieve.
In the process, a part of high-temperature gas discharged from the rear end of the CO furnace flows back to the inlet of the CO furnace, so that the temperature of the gas entering the CO furnace is increased, and the heat load of the multistage preheating heat exchanger is reduced; one part is used for thermal desorption, the gas temperature is not lower than 150 ℃, and the energy consumption of a heater in the molecular sieve adsorption and desorption mechanism is reduced; the equipment investment of the pretreatment module and the molecular sieve adsorption and desorption module is also reduced by the backflow of the high-temperature gas.
Wherein, the exhaust port of the heat exchange type CO device is connected with the air inlet of the heat exchange type CO device.
In the structure, part of high-temperature gas exhausted by the heat exchange type CO device can flow back to the inlet of the CO furnace, so that the temperature of the gas entering the CO furnace is improved, and the heat load of the multistage preheating heat exchanger is reduced.
The high-concentration organic waste gas treatment system provided by the embodiment of the invention further comprises four induced draft fans, wherein one induced draft fan is communicated with the exhaust port of the adsorption area, the other induced draft fan is communicated with the exhaust port of the desorption area, the other induced draft fan is communicated with the exhaust port of the cooling area, and the other induced draft fan is communicated with the exhaust port of the heat exchange type CO device.
The draught fans are arranged at the exhaust ports of the devices, and exhausted gas can be conveyed to the next procedure by utilizing negative pressure of the draught fans.
the heat exchange type CO device comprises a multistage preheating heat exchanger, a catalytic oxidation chamber and a heating chamber which are connected in sequence, wherein an exhaust port of the heating chamber is connected with an air inlet of the multistage preheating heat exchanger.
The working process of the structure is as follows: the high-concentration organic waste gas originally discharged enters the heat exchange type CO furnace through the air pipe, is preheated by the bottom multi-stage preheating heat exchanger and then enters the catalytic oxidation furnace, and most organic molecules are oxidized and decomposed and then enter the multi-stage preheating heat exchanger through the heating chamber to be subjected to heat recovery.
The specific embodiment is as follows:
As shown in fig. 1, the pipeline connection and operation process of the processing system may be as follows:
The high-concentration waste gas directly enters the heat exchange type CO treatment device through a pipeline, and the waste gas at the gas inlet is heated by a multi-stage preheating heat exchanger in the CO device to reach the optimal catalytic reaction temperature. The high-temperature gas after the catalytic oxidation reaction is used as a heat source of a heat exchanger to preheat gas at the gas inlet, so that heat is recovered.
the heat exchange type CO starts to work under the driving of a No. 1 negative pressure fan connected with the gas outlet, and high-temperature gas is discharged. The outlet of the No. 1 fan is divided into three paths: the water cooler import is connected to the first way, carries out water cooling treatment to the gas that gets into rear end processing module molecular sieve adsorption desorption device, guarantees the normal adsorption work of molecular sieve, adsorbs to give vent to anger then directly discharges under No. 2 fan negative pressure drives. The second path flows back to the air inlet of the heat exchange type CO to dilute the concentration of the gas to be treated entering the front end of the system, reduce the treatment capacity of rear-end treatment equipment and serve as high-concentration waste gas of the air inlet to rapidly dilute air. The third path is connected with a desorption gas inlet of the molecular sieve adsorption and desorption device, the energy consumption of a heater is reduced by fully utilizing the gas heat discharged by the heat exchange type CO gas, a No. 3 fan is arranged at a desorption gas outlet, the desorption gas is driven by negative pressure, desorption air is blown into the inlet of the heat exchange type CO device, and the heat exchange type CO is utilized for oxidation decomposition to form closed cycle; the cooling air gas of the molecular sieve adsorption and desorption device is simultaneously refluxed to the air inlet of the heat exchange type CO under the negative pressure drive of a No. 4 fan.
It can be seen that the processing system with the structure has the following characteristics:
The system design is novel. The heat exchange type CO and molecular sieve adsorption and desorption device is adopted to jointly treat high-concentration organic waste gas, the heat exchange type CO is firstly utilized to oxidize and decompose the high-concentration waste gas, then the molecular sieve is utilized to carry out adsorption treatment, and finally the ultralow emission standard (such as not more than 20mg/m3) is met.
The device can exert the maximum purification efficiency. The heat exchange type catalytic oxidation and molecular sieve adsorption and desorption device is used jointly, the optimal treatment efficiency of primary catalytic oxidation and adsorption and desorption is fully exerted, and various environmental protection devices exert the maximum use efficiency. In the invention, the heat exchange type CO and the molecular sieve adsorption and desorption device are jointly used, only one catalytic oxidation treatment is adopted, so that the investment cost of the CO device can be reduced, and the efficiency is high.
Thirdly, the heat is fully utilized, the energy consumption is low, and the investment cost is low. The heat exchanger is preheated in a multistage manner in the heat exchange type CO equipment, heat energy is recovered, energy loss is reduced, electric heating energy consumption is low, and high-temperature gas exhausted by the heat exchange type CO device is partially used for desorption of the molecular sieve, so that high cost of desorption is saved, and partially flows back to the front end of the CO device and is used for diluting gas to be treated, so that the gas distribution amount of outside air is saved, the size of subsequent equipment is reduced, and the subsequent equipment (the molecular sieve adsorption desorption device, the water cooler, the fan and the like) is saved.
And fourthly, the flexibility is strong. It is also suitable for working conditions with high concentration and large fluctuation of waste gas concentration.
Small floor area.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained: the embodiment of the invention provides a high-concentration organic waste gas treatment system, which comprises the following components in sequential connection: the waste gas directly enters the heat exchange type CO device through a pipeline to be subjected to oxidative decomposition of high-concentration organic waste gas, the decomposed high-temperature gas enters the molecular sieve adsorption and desorption device through the water cooler, and the adsorbed gas is directly discharged. The molecular sieve desorption air adopts high-temperature gas at a heat exchange type CO gas outlet, the desorption gas is returned to the front end of the heat exchange type CO device, and oxidation treatment is continued to form a local closed loop state; the molecular sieve cooling air utilizes normal temperature air, and the cooled gas is still conveyed to the front end of the heat exchange type CO. The whole treatment system has the advantages of strong flexibility, excellent purification effect, full utilization of heat, low standard emission and optimal equipment investment in treating the organic waste gas with high concentration.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It should be understood by those skilled in the art that the timing sequence of the method steps provided in the above embodiments may be adaptively adjusted according to actual situations, or may be concurrently performed according to actual situations.
all or part of the steps in the methods according to the above embodiments may be implemented by a program instructing related hardware, where the program may be stored in a storage medium readable by a computer device and used to execute all or part of the steps in the methods according to the above embodiments. The computer device, for example: personal computer, server, network equipment, intelligent mobile terminal, intelligent home equipment, wearable intelligent equipment, vehicle-mounted intelligent equipment and the like; the storage medium, for example: RAM, ROM, magnetic disk, magnetic tape, optical disk, flash memory, U disk, removable hard disk, memory card, memory stick, network server storage, network cloud storage, etc.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (5)
1. The utility model provides a high concentration organic waste gas treatment system which characterized in that, including connecting gradually: the device comprises a heat exchange type CO device, a water cooler and a molecular sieve adsorption and desorption device, wherein the heat exchange type CO device is used for carrying out primary treatment on waste gas, the molecular sieve adsorption and desorption device is used for carrying out secondary treatment on the waste gas, and the heat exchange type CO device is combined with the molecular sieve adsorption and desorption device to ensure the low-standard emission of the waste gas;
The molecular sieve adsorption and desorption device comprises an adsorption area, a cooling area and a desorption area;
The air inlet of the water cooler is connected with the air outlet of the heat exchange type CO device, the air outlet of the water cooler is connected with the air inlet of the adsorption area, and the air outlet of the adsorption area is connected with the chimney;
The gas inlet of the desorption area is connected with the gas outlet of the heat exchange type CO device, and the gas outlet of the desorption area is connected with the gas inlet of the heat exchange type CO device;
And the exhaust port of the cooling area is connected with the air inlet of the heat exchange type CO device.
2. The high concentration organic waste gas treatment system of claim 1, wherein an exhaust port of the heat-exchanged CO device is coupled to an intake port of the heat-exchanged CO device.
3. The high concentration organic waste gas treatment system according to claim 1, further comprising four induced draft fans, wherein one induced draft fan is communicated with the exhaust port of the adsorption zone, one induced draft fan is communicated with the exhaust port of the desorption zone, one induced draft fan is communicated with the exhaust port of the cooling zone, and one induced draft fan is communicated with the exhaust port of the heat exchange type CO device.
4. the high concentration organic waste gas treatment system of claim 1, wherein the heat exchange CO unit comprises a multi-stage preheat exchanger, a catalytic oxidation chamber, and a heating chamber connected in series, wherein an exhaust port of the heating chamber is connected to an intake port of the multi-stage preheat exchanger.
5. The high concentration organic waste gas treatment system of claim 1, wherein the water cooler comprises a heat transfer zone and a dehumidification zone, and the waste gas enters from an inlet of the water cooler, passes first through the heat transfer zone, then through the dehumidification zone, and finally exits from an outlet of the water cooler.
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| CN201710692950.9A CN107281933B (en) | 2017-08-14 | 2017-08-14 | High concentration organic waste gas treatment system |
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| CN201710692950.9A CN107281933B (en) | 2017-08-14 | 2017-08-14 | High concentration organic waste gas treatment system |
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| CN107281933B true CN107281933B (en) | 2019-12-06 |
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| DE4003668A1 (en) * | 1989-02-20 | 1990-08-23 | Siemens Ag | Outgoing air purification - by absorption of hydrocarbon(s) in activated carbon followed by desorption and catalytic oxidn. |
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| CN205288048U (en) * | 2015-12-21 | 2016-06-08 | 杭州尹力环保科技有限公司 | Organic waste gas adsorbs desorption - catalytic oxidation clarification plant |
| CN205760473U (en) * | 2016-05-13 | 2016-12-07 | 广州市怡森环保设备有限公司 | A kind of zeolite runner cleaning equipment for waste organic gas |
| CN106582263A (en) * | 2015-10-19 | 2017-04-26 | 江苏中科睿赛污染控制工程有限公司 | Rotary wheel adsorption concentration and catalytic oxidation device and process |
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2017
- 2017-08-14 CN CN201710692950.9A patent/CN107281933B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4003668A1 (en) * | 1989-02-20 | 1990-08-23 | Siemens Ag | Outgoing air purification - by absorption of hydrocarbon(s) in activated carbon followed by desorption and catalytic oxidn. |
| CN102764564A (en) * | 2012-07-27 | 2012-11-07 | 海湾环境科技（北京）股份有限公司 | Waste gas recovery processing system, and recovery processing technique of waste gas |
| CN106582263A (en) * | 2015-10-19 | 2017-04-26 | 江苏中科睿赛污染控制工程有限公司 | Rotary wheel adsorption concentration and catalytic oxidation device and process |
| CN205288048U (en) * | 2015-12-21 | 2016-06-08 | 杭州尹力环保科技有限公司 | Organic waste gas adsorbs desorption - catalytic oxidation clarification plant |
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