CN114452774A - VOC waste gas recovery treatment system and treatment method - Google Patents
VOC waste gas recovery treatment system and treatment method Download PDFInfo
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- CN114452774A CN114452774A CN202210182715.8A CN202210182715A CN114452774A CN 114452774 A CN114452774 A CN 114452774A CN 202210182715 A CN202210182715 A CN 202210182715A CN 114452774 A CN114452774 A CN 114452774A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 90
- 238000011084 recovery Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 254
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000002808 molecular sieve Substances 0.000 claims abstract description 107
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 107
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 98
- 238000001816 cooling Methods 0.000 claims abstract description 93
- 239000007789 gas Substances 0.000 claims abstract description 83
- 230000018044 dehydration Effects 0.000 claims abstract description 78
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 78
- 230000008929 regeneration Effects 0.000 claims abstract description 70
- 238000011069 regeneration method Methods 0.000 claims abstract description 70
- 238000001179 sorption measurement Methods 0.000 claims abstract description 34
- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000003672 processing method Methods 0.000 claims abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 58
- 238000010521 absorption reaction Methods 0.000 claims description 45
- 238000003795 desorption Methods 0.000 claims description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 238000009833 condensation Methods 0.000 claims description 15
- 230000005494 condensation Effects 0.000 claims description 15
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 10
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 239000012855 volatile organic compound Substances 0.000 description 99
- 208000005156 Dehydration Diseases 0.000 description 62
- 238000000926 separation method Methods 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 moving adsorbents, e.g. rotating beds
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/116—Molecular sieves other than zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Gases (AREA)
- Treating Waste Gases (AREA)
Abstract
The application relates to a VOC waste gas recovery processing system and a processing method, comprising a rotary wheel adsorber, a waste gas discharge channel and a waste gas discharge channel; the rotary wheel adsorber comprises an adsorption zone, a cooling zone and a regeneration zone, wherein an outlet of the waste gas discharged into the channel is connected with an inlet of the adsorption zone, and an outlet of the adsorption zone is connected with an inlet of the waste gas discharge channel; the device also comprises a circulating part, wherein the circulating part comprises a nitrogen discharging channel, a regeneration heating channel, a molecular sieve dehydration tank and a condensing part; the inlet of the nitrogen discharging channel is communicated with the inlet of the cooling zone, the outlet of the cooling zone is communicated with the inlet of the regeneration heating channel, the outlet of the regeneration heating channel is communicated with the inlet of the regeneration zone, the outlet of the regeneration zone is communicated with the inlet of the molecular sieve dehydration tank, the outlet of the molecular sieve dehydration tank is communicated with the condensing part, and the gas outlet of the condensing part is communicated with the nitrogen discharging channel; the problem that water in the pipeline freezes to cause ice blockage due to the fact that water exists in the VOC-containing gas can be improved.
Description
Technical Field
The application relates to the field of waste gas treatment and recovery equipment, in particular to a VOC waste gas recovery treatment system and a treatment method.
Background
VOC is a volatile organic compound which can cause harm to the environment, industries such as medicine, chemical industry, glue, coating, paint and the like are main enterprises generating VOC-containing waste gas, and the VOC-containing waste gas generated by the enterprises is accompanied by more moisture and needs to be treated by special treatment equipment before being discharged into the air.
The existing treatment equipment generally separates the VOC from the exhaust gas by using a condensation method, but the condensation temperature is generally below zero ℃, and water in the exhaust gas can freeze, so that the adoption of the condensation method can cause ice blockage of a pipeline, and the improvement is needed.
Disclosure of Invention
In order to solve the problems of difficulty and potential safety hazard in VOC separation caused by the presence of water in VOC-containing gas, the application provides a VOC waste gas recovery treatment system and a treatment method.
The VOC waste gas recovery treatment system and the treatment method adopt the following technical scheme:
a VOC waste gas recovery processing system and a processing method thereof comprise a rotary wheel absorber, a waste gas discharge channel and a waste gas discharge channel; the rotary wheel adsorber comprises an adsorption zone, the outlet of the waste gas discharge channel is connected with the inlet of the adsorption zone, and the outlet of the adsorption zone is connected with the inlet of the waste gas discharge channel; the system also comprises a circulating part, wherein the circulating part comprises a nitrogen discharging channel, a regeneration heating channel, a molecular sieve dehydration tank and a condensing part; the rotary wheel adsorber also comprises a cooling zone and a regeneration zone; the inlet of the nitrogen discharging channel is communicated with the inlet of the cooling area, the outlet of the cooling area is communicated with the inlet of the regeneration heating channel, the inlet of the outlet regeneration area of the regeneration heating channel is communicated, the outlet of the regeneration area is communicated with the inlet of the molecular sieve dehydration tank, the outlet of the molecular sieve dehydration tank is communicated with the condensing part, and the gas outlet of the condensing part is communicated with the nitrogen discharging channel.
By adopting the technical scheme, the waste gas is discharged into the channel from the waste gas and enters the adsorption area, the VOC is desorbed in the adsorption area after the waste gas comes out of the adsorption area, and then the qualified waste gas is discharged through the waste gas discharge channel;
the circulating part is based on the requirements of a cooling area and a regeneration area, gas is discharged into a channel from nitrogen and enters the cooling area, the gas takes away heat of the cooling area and then enters a runner desorption heater, the runner desorption heater heats the gas to a desorption temperature and then enters the runner regeneration area, the gas carrying heat passes through the regeneration area and then desorbs VOC on the regeneration area, the concentration of VOC in the gas is high, the gas containing high-concentration VOC enters a molecular sieve dehydration tank for dehydration, and the gas is low-water-content high-concentration VOC; the gas with low water content and high concentration VOC enters the condensing part, the VOC is condensed in the condensing part and is separated from the gas, the gas with water and VOC removed enters the nitrogen from the gas outlet of the condensing part and is discharged into the channel to form a closed loop, and the gas flows in the closed loop system in a reciprocating manner, so that the collection of the VOC and the water is realized.
Optionally, the device further comprises a water recovery part, wherein the water recovery part comprises a diversion channel, a dehydration tank desorption heater and a backflow channel, an inlet of the diversion channel is communicated with the nitrogen discharge channel, an outlet of the diversion channel is communicated with an inlet of the dehydration tank desorption heater, an outlet of the dehydration tank desorption heater is communicated with an outlet of the molecular sieve dehydration tank, and an inlet of the molecular sieve dehydration tank is communicated with an inlet of the backflow channel.
By adopting the technical scheme, when the molecular sieve dehydration tank is saturated, water needs to be desorbed from the molecular sieve dehydration tank so as to be convenient for continuous water absorption;
partial gas discharged into the channel by nitrogen enters the diversion channel, then the gas flows into the dehydration tank desorption heater from the diversion channel to be heated, the gas carrying heat carries away the water inside after passing through the molecular sieve dehydration tank, and leaves the molecular sieve dehydration tank through the backflow channel, so that the molecular sieve dehydration tank can absorb water again.
Optionally, the water recovery part further comprises a cooling assembly, an outlet of the backflow channel is connected with an inlet of the cooling assembly, and an outlet of the cooling assembly is connected with an inlet of the molecular sieve dehydration tank.
Through adopting above-mentioned technical scheme, after the water recovery part increases cooling module, the moisture that enters into in the cooling module from return channel condenses moisture in cooling module, makes water and gas separation, and the water that breaks away from is discharged from cooling module for carry out the separation of water process once, and comparatively dry gas then lets in the molecular sieve dewatering tank once more, carries out more thorough dehydration, then forms the circulation.
Optionally, the system further comprises a molecular sieve water absorption tank, wherein an inlet of the molecular sieve water absorption tank is also communicated with an outlet of the regeneration zone, and an outlet of the molecular sieve water absorption tank is also communicated with an inlet of the condensing part; the water recovery part also comprises a dehydration tank recovery channel, the outlet of the desorption heater of the dehydration tank is communicated with the outlet of the molecular sieve water absorption tank, the inlet of the molecular sieve water absorption tank is communicated with the inlet of the dehydration tank recovery channel, and the outlet of the dehydration tank recovery channel is communicated with the return channel.
By adopting the technical scheme, the molecular sieve water absorption tank and the molecular sieve dehydration tank have the same structure and function and can play a role in dehydration; when only one molecular sieve dehydration tank is provided, if the molecular sieve dehydration tank needs to be dehydrated, the work of the circulating part needs to be stopped, and at the moment, the molecular sieve dehydration tank cannot absorb water; and the molecular sieve water absorption tank is arranged, then dehydration and water absorption can be carried out simultaneously, if the molecular sieve water absorption tank is responsible for absorbing water, the inlet of the backflow channel is closed, the joint of the outlet of the desorption heater of the dehydration tank and the inlet of the molecular sieve dehydration tank is closed, the molecular sieve water absorption tank is responsible for dehydration, the joint of the outlet of the molecular sieve water absorption tank and the inlet of the condensation piece is closed, and the joint of the molecular sieve water absorption tank and the regeneration area is closed.
Optionally, the system further comprises a heat regenerator, wherein the heat regenerator comprises a cold flow inlet I, a cold flow outlet I, a cold flow inlet II and a cold flow outlet II; the first cold flow inlet is independently communicated with the first cold flow outlet, and the second cold flow inlet is independently communicated with the second cold flow outlet; the first cold flow inlet is communicated with outlets of the molecular sieve dehydration tank and the molecular sieve water absorption tank together, the first cold flow outlet is communicated with an inlet of a condensing piece, an outlet of the condensing piece is communicated with a second cold flow inlet, and the second cold flow outlet is communicated with a nitrogen discharge channel.
Through adopting above-mentioned technical scheme, the gas that has taken off water from molecular sieve dewatering tank or molecular sieve absorption tank enters into the regenerator and carries out the primary cooling, then carry out the degree of depth cooling through the condensing part, in order to reach the condensation requirement, reduce the energy resource consumption, and the VOC in the gas after coming out from the condensing part is left the condensing part and is discharged away, the low temperature gas that has separated water and VOC at this moment passes through the regenerator once more, take away partly with the heat of regenerator, make the regenerator possess the primary cooling effect, realize the recycle of the energy.
Optionally, the inlet of the cooling module is simultaneously communicated with the outlet of the regeneration zone.
Through adopting above-mentioned technical scheme, the gas that passes and take away VOC from the regeneration zone does not directly get into the molecular sieve jar but in passing through cooling module earlier for the gas that comes out from the regeneration zone also can carry out the condensation and the separation of first way water earlier, avoids molecular sieve dewatering tank or molecular sieve suction tank to load too big.
Optionally, the gas discharged from the inlet of the nitrogen discharge channel is nitrogen; the oxygen content in the circulating part and the water recovery part is lower than the designated concentration, and nitrogen is introduced into the channel for discharging the additional gas; the oxygen content in the circulating part and the water recovery part is higher than the specified concentration, and the nitrogen gas is stopped from being introduced into the additional gas discharging channel.
By adopting the technical scheme, the condensation method aims at high-concentration waste gas. For the medium-low concentration waste gas, the waste gas is firstly subjected to adsorption concentration, and then is condensed after the concentration of the waste gas is improved. However, the adsorption concentration is limited by 25% below the explosion limit, and the increase concentration is limited. If the concentration is forced to be increased, the production safety risk exists. After the nitrogen is introduced into the circulating part, the concentration of oxygen in the circulating part can be reduced, and the reaction with the oxygen when the concentration of VOC is too high is avoided.
Optionally, the second cold flow outlet is simultaneously communicated with the exhaust gas discharge channel.
By adopting the technical scheme, after the cold flow outlet II is communicated with the waste gas discharge channel, before the circulation part starts to work, nitrogen is discharged into the circulation part and the water recovery part through the nitrogen discharge channel, then the interface between the cold flow outlet II and the nitrogen discharge channel is closed, the nitrogen can not enter the nitrogen discharge channel again after flowing for a circle and can only pass through the adsorption zone to finally discharge the nitrogen with high oxygen content, and the effect of facilitating the discharge of the oxygen is achieved.
The VOC waste gas recovery processing method adopts the following technical scheme:
s1, opening an opening at the joint of the cold flow outlet II and the waste gas discharge channel, introducing nitrogen into the nitrogen discharge channel, allowing the nitrogen to pass through the rotating wheel adsorber, the circulating part and the water recovery part respectively, closing the opening at the joint of the cold flow outlet II and the waste gas discharge channel, stopping introducing nitrogen into the nitrogen discharge channel, and allowing the circulating part to form a closed loop again when the oxygen content in the rotating wheel adsorber, the circulating part and the water recovery part is reduced to a specified concentration;
s2, introducing VOC-containing waste gas into the waste gas discharge channel, adsorbing the VOC-containing waste gas on a rotary wheel adsorber after the VOC-containing waste gas passes through an adsorption area, and discharging the purified waste gas from the waste gas discharge channel;
s3, the rotary wheel absorber works to transfer the VOC adsorbed on the adsorption area to the regeneration area, nitrogen discharged into the channel passes through the cooling area, the nitrogen passing through the outlet of the cooling area absorbs heat energy of the cooling area and then passes through the regeneration area, and the nitrogen passes through the outlet of the regeneration area to carry away the VOC attached in the regeneration area to form high-concentration VOC nitrogen;
s4, enabling the nitrogen carrying the VOC absorbed from the regeneration area to pass through a cooling assembly, primarily cooling the nitrogen containing high-concentration VOC in the cooling assembly, condensing part of water in the nitrogen containing high-concentration VOC through the cooling assembly, then separating the part of water from the nitrogen, and discharging condensed water from the cooling assembly;
s5, separating part of water from the cooling assembly, enabling the nitrogen containing the high-concentration VOC to pass through a molecular sieve water absorption tank, and absorbing residual water contained in the nitrogen containing the high-concentration VOC into the molecular sieve water absorption tank;
s6, passing the nitrogen containing high-concentration VOC discharged from the water absorption tank through a condensing part, condensing the VOC in the nitrogen containing high-concentration VOC through the condensing part and separating the VOC from the nitrogen, and discharging the condensed VOC from the condensing part;
and S7, re-entering the nitrogen into the nitrogen discharging channel after the VOC is separated by the condensing part, discharging the nitrogen into the channel, passing through the cooling area again, and starting a new cycle.
Through adopting above-mentioned technical scheme, nitrogen gas leads to the runner adsorber earlier, discharge oxygen in circulation part and the water recovery part, the gas that will contain high VOC concentration after oxygen content reaches standard discharges the runner adsorber, VOC remains on the runner adsorber, qualified waste gas is discharged, then circulation part starts, stay the nitrogen gas in the closed loop circulation part through circulation part, carry out moisture separation after desorption out nitrogen gas from the runner adsorber, then carry out the VOC separation again, last qualified nitrogen gas enters into nitrogen gas once more and discharges into in the passageway, begin new circulation.
It is optional, the partial nitrogen gas of nitrogen gas admission passageway is simultaneously through reposition of redundant personnel passageway, nitrogen gas is by reposition of redundant personnel passageway through drain sump desorption heater, nitrogen gas absorbs the heat in the drain sump desorption heater, absorbed thermal nitrogen gas and absorbed the jar through the molecular sieve, the moisture desorption that has thermal nitrogen gas and absorb the jar internal adsorption of molecular sieve, nitrogen gas after having absorbed the moisture in the molecular sieve water absorption jar passes through cooling module, moisture in the nitrogen gas that contains water condenses in cooling module, the water of condensation is discharged from cooling module, nitrogen gas after the cooling module enters into the molecular sieve drain sump.
Through adopting above-mentioned technical scheme, nitrogen gas that nitrogen gas discharged into the passageway simultaneously through reposition of redundant personnel passageway, this part nitrogen gas enters into water recovery part, comes out the moisture desorption in the molecular sieve dewatering tank, and the nitrogen gas that has absorbed moisture is through the condensation subassembly, and moisture is by the condensation in cooling module, and the nitrogen gas after the dehydration enters into the molecular sieve and absorbs water the jar in, returns to the circulation part and begins to continue the circulation.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the waste gas is discharged into the channel from the waste gas and enters the adsorption area, the VOC is desorbed in the adsorption area after the waste gas is discharged from the adsorption area, and then the qualified waste gas is discharged through the waste gas discharge channel;
2. the circulating part is based on the requirements of a cooling area and a regeneration area, gas is discharged into a channel from nitrogen and enters the cooling area, the gas takes away heat of the cooling area and then enters the regeneration area, the gas carrying the heat passes through the regeneration area and then desorbs VOC on the regeneration area, the concentration of the VOC in the gas is high, the gas containing high-concentration VOC enters a molecular sieve dehydration tank for dehydration treatment, and the gas is low-water-content high-concentration VOC; the gas with low water content and high concentration VOC enters the condensing part, the VOC is condensed in the condensing part and is separated from the gas, the gas with water and VOC removed enters the nitrogen from the gas outlet of the condensing part and is discharged into the channel to form a closed loop, and the gas flows in the closed loop system in a reciprocating manner, so that the collection of the VOC and the water is realized, and the cost consumption is reduced;
3. the ring runs in a nitrogen environment, the limitation of VOC waste gas explosion conditions is eliminated, the concentration multiplying power of the adsorption rotating wheel is improved, and the condensation efficiency is improved.
Drawings
Fig. 1 is a schematic overall structural diagram of an embodiment of the present application.
Description of reference numerals: 1. a rotating wheel absorber; 11. an adsorption zone; 12. a cooling zone; 13. a regeneration zone; 21. exhaust gas is discharged into the passage; 22. an exhaust gas discharge passage; 23. a rotary wheel fan; 31. discharging nitrogen into the channel; 32. a regenerative heating channel; 33. a VOC regeneration channel; 34. a molecular sieve dehydration tank; 35. a molecular sieve water absorption tank; 36. a cold flow channel; 37. cooling the surface; 38. a condensing member; 4. a heat regenerator; 5. a rotating wheel desorption heater; 61. a flow dividing channel; 62. a return channel; 63. a dehydration tank desorption heater; 64. a water tank recovery channel; 65. cooling the front surface; 66. cooling the surface; 67. a cryogenic fan; 68. a molecular sieve support desorption fan; 7. a branch circuit; 10. a stop valve; 100. a subduct.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
The embodiment of the application discloses VOC waste gas recovery processing system and processing method, which comprises a waste gas processing part and a circulating part. The waste gas separates VOC after the waste gas treatment part and becomes qualified waste gas, and VOC then remains in the waste gas treatment part, and circulation part and waste gas treatment part are correlated with and the circulation work is with water, the VOC gradual separation in the waste gas treatment part, play the effect of recovered water and VOC.
The waste gas treatment part comprises a rotary wheel adsorber 1, a waste gas discharge passage 21 and a waste gas discharge passage 22, the rotary wheel adsorber 1 comprises an adsorption zone 11, a cooling zone 12 and a regeneration zone 13, an outlet of the waste gas discharge passage 21 is communicated with an inlet of the adsorption zone 11, and an outlet of the adsorption zone 11 is communicated with an inlet of the waste gas discharge passage 22. Waste gas is discharged into the channel 21 through waste gas and is entered into the adsorption zone 11, and the VOC that contains in the waste gas is desorbed on the adsorption zone 11, and the waste gas that reaches standard is discharged through the waste gas discharge channel 22.
The circulating part comprises a nitrogen gas discharge channel 31, a regeneration heating channel 32, a VOC regeneration channel 33, a molecular sieve dehydration tank 34, a molecular sieve water suction tank 35, a cold flow channel 36, a back surface cooler 37, a heat regenerator 4 and a condensing part 38. A stop valve 10 for controlling the opening and closing of the channel is arranged in the nitrogen discharging channel 31, the outlet of the nitrogen discharging channel 31 is communicated with the inlet of the regeneration zone 13, the outlet of the regeneration zone 13 is communicated with the inlet of the regeneration heating channel 32, the rotary wheel desorption heater 5 is arranged on the regeneration heating channel 32, the outlet of the regeneration heating channel 32 is communicated with the inlet of the regeneration zone 13, the outlet of the regeneration zone 13 is communicated with the inlet of the VOC regeneration channel 33, two outlets of the VOC regeneration channel 33 extend out and are respectively communicated with the inlets of the molecular sieve dewatering tank 34 and the molecular sieve water suction tank 35, the two outlet positions of the VOC regeneration channel 33 are also provided with the stop valve 10 for controlling the opening and closing of the outlet, two inlets of the cold flow channel 36 extend and are respectively communicated with the outlets of the molecular sieve dewatering tank 34 and the molecular sieve water suction tank 35, and two inlets of the cold flow channel 36 are also provided with the stop valve 10 for controlling the opening and closing of the inlet, the outlet of the cold flow channel 36 is communicated with the inlet of the rear surface cooler 37, the outlet of the rear surface cooler 37 is communicated with the inlet of the condensing element 38, the condensing element 38 is a deep cooler, and the outlet of the condensing element 38 is communicated with the nitrogen discharged into the channel 31.
The regenerator 4 is located between the condensing member 38 and the rear surface cooler 37, and the regenerator 4 comprises a cold flow inlet I, a cold flow outlet I, a cold flow inlet II and a cold flow outlet II. The first cold flow inlet is communicated with the first cold flow outlet independently, and the second cold flow inlet is communicated with the second cold flow outlet independently. The first cold flow inlet is communicated with an outlet of the rear surface cooler 37, the first cold flow outlet is communicated with an inlet of the condenser 38, an outlet of the condenser 38 is communicated with the second cold flow inlet, the second cold flow outlet is communicated with the nitrogen discharge channel 31, and a stop valve 10 for controlling the opening and closing of the connection position is also arranged at the connection position of the second cold flow outlet and the nitrogen discharge channel 31.
When the VOC-containing waste gas passes through the adsorption area 11, the VOC is left on the rotary wheel adsorber 1, the gas is discharged into the channel 31 from the nitrogen, the gas takes away the heat of the cooling area 12 after passing through the cooling area 12, the gas carrying a certain amount of heat enters the regeneration heating channel 32 and is heated by the rotary wheel desorber, the gas carrying enough heat passes through the regeneration area 13, and desorbs the VOC on the regeneration area 13, at this time, the gas with high VOC concentration enters into the molecular sieve water absorption tank 35 or the molecular sieve dehydration tank 34 for dehydration treatment, the gas with low water and high VOC concentration which is discharged from the molecular sieve water absorption tank 35 or the molecular sieve dehydration tank 34 is primarily cooled by the surface cooling 37, then the gas enters the heat regenerator 4 for further cooling, and finally enters the deep cooler for VOC condensation, the VOC is separated from the gas in the deep cooler, and the separated gas enters the nitrogen discharge channel 31 for circulation.
In order to dewater the molecular sieve water suction tank 35 or the molecular sieve dewatering tank 34 after the water suction capacity of the molecular sieve water suction tank 35 or the molecular sieve dewatering tank 34 is saturated, a water recovery part is further arranged on the circulating part. The water recovery section includes a diversion channel 61, a return channel 62, a dehydration tank desorption heater 63, a dehydration tank recovery channel 64, and a cooling assembly. The inlet of the flow dividing channel 61 is communicated with the nitrogen gas discharge channel 31, the gas also passes through the flow dividing channel 61 before entering the cooling zone 12 from the nitrogen gas discharge channel 31, and the outlet of the flow dividing channel 61 is connected with the inlet of the dehydration tank desorption heater 63. Two outlets of the dehydration tank desorption heater 63 are formed and are respectively communicated with the molecular sieve water absorption tank 35 and the molecular sieve dehydration tank 34, and the two outlets of the dehydration tank desorption heater 63 are also provided with the stop valves 10. The inlet of the return channel 62 is communicated with the inlet of the molecular sieve dewatering tank 34, the joint of the inlet of the return channel 62 and the inlet of the molecular sieve dewatering tank 34 is also provided with a stop valve 10, and the outlet of the return channel 62 is communicated with the inlet of the cooling assembly. The inlet of the dehydration tank recovery channel 64 is communicated with the inlet of the molecular sieve water absorption tank 35, the joint of the inlet of the dehydration tank recovery channel 64 and the inlet of the molecular sieve water absorption tank 35 is also provided with a stop valve 10, and the outlet of the dehydration tank recovery channel 64 is communicated with the return channel 62.
The cooling assembly comprises a front surface cooler 65 and a middle surface cooler 66, wherein the front surface cooler 65 and the middle surface cooler 66 are arranged on the VOC regeneration channel 33, the inlet of the return channel 62 is connected with the inlet of the front surface cooler 65, so that the gas on the VOC regeneration channel 33 and on the return channel 62 firstly passes through the front surface cooler 65 and then passes through the middle surface cooler 66, and then the moisture in the gas is primarily separated from the gas in the process and is left in the front surface cooler 65 and the middle surface cooler 66 to be discharged additionally. The gas from the diversion channel 61 can be heated by the dehydration tank support heater, and the heated gas enters the interior of the tank body from the molecular sieve water suction tank 35 or the outlet of the molecular sieve dehydration tank 34 for dehydration treatment. And the cooling assembly is arranged to enable the molecular sieve water suction tank 35 and the molecular sieve dehydration tank 34 to respectively perform water suction and dehydration.
The cold flow outlet is divided into a branch 7, the branch 7 is communicated with the waste gas discharge channel 21, a stop valve 10 is also arranged at the joint of the branch 7 and the waste gas discharge channel 21, the gas discharged into the nitrogen gas discharge channel 31 is nitrogen gas, the reaction with VOC can be reduced, the oxygen content in the circulating part and the water recovery part is lower than the specified concentration, and nitrogen gas is introduced into the additional gas discharge channel 31; the oxygen content in the circulation part and the water recovery part is higher than a prescribed concentration, and the introduction of nitrogen gas into the additional gas discharge passage 31 is stopped. Before the circulation part starts to work, nitrogen is introduced into the nitrogen discharging channel 31 and flows through the circulation part, the stop valve 10 at the joint of the cold flow outlet II and the nitrogen discharging channel 31 is closed, gas with high oxygen content is discharged from the branch 7 to the waste gas discharging channel 22 until the nitrogen in the circulation part occupies most part, then the stop valve 10 at the joint of the branch 7 and the waste gas discharging channel 21 is closed, the stop valve 10 at the joint of the cold flow outlet II and the nitrogen discharging channel 31 is opened, and the circulation part starts to work. The second cold flow outlet communicates with the nitrogen gas discharge channel 31 through an additional sub-pipe 100.
A molecular sieve support desorption fan 68 is arranged at the diversion channel 61 and used for pushing the gas in the return channel 62 into the dehydration tank desorption heater 63 more quickly. A rotary fan 23 is arranged at the waste gas discharge passage 22 for discharging the waste gas from the adsorption zone 11 more quickly. The VOC regeneration path 33 is provided with a cryogenic fan 67 between the front surface cooling 65 and the cooling zone 12 for discharging the gas from the regeneration zone 13 to the front surface cooling 65 more quickly.
The embodiment of the application also discloses a VOC waste gas recovery processing method, which comprises the following steps:
s1, opening an opening at the joint of the cold flow outlet II and the waste gas discharged into the channel 21, introducing nitrogen into the nitrogen gas discharge channel 31, wherein the nitrogen gas passes through the rotary wheel adsorber 1, the circulating part and the water recovery part respectively, when the oxygen content in the rotary wheel adsorber 1, the circulating part and the water recovery part is reduced to a specified concentration, closing the opening at the joint of the cold flow outlet II and the waste gas discharged into the channel 21, stopping introducing the nitrogen gas into the nitrogen gas discharge channel 31, and forming a closed loop by the circulating part again;
s2, introducing VOC-containing waste gas into the waste gas discharge channel 21, starting the rotary wheel fan 23, adsorbing VOC on the rotary wheel adsorber 1 after the VOC-containing waste gas passes through the adsorption zone 11, and discharging the purified waste gas from the waste gas discharge channel 22;
s3, starting a cryogenic fan, transferring the VOC adsorbed on the adsorption area 11 to the regeneration area 13 by the operation of the rotary wheel adsorber 1, allowing the nitrogen discharged into the channel 31 to pass through the cooling area 12, allowing the nitrogen passing through the outlet of the cooling area 12 to absorb the heat energy of the cooling area 12 and then pass through the regeneration area 13, and taking away the VOC attached in the regeneration area 13 after the nitrogen passes through the outlet of the regeneration area 13 to form high-concentration VOC nitrogen;
s4, the nitrogen with the VOC absorbed from the regeneration area 13 passes through front surface cooling 65 and middle surface cooling 66 in the cooling assembly, the nitrogen with high-concentration VOC is primarily cooled in the cooling assembly, part of water in the nitrogen with high-concentration VOC is separated from the nitrogen after being condensed by the cooling assembly, and condensed water is discharged from the cooling assembly;
s5, closing an inlet of the molecular sieve dehydration tank 34, enabling the nitrogen gas containing the high-concentration VOC after part of water is separated from the cooling assembly to pass through the molecular sieve water absorption tank 35, and enabling the residual water contained in the nitrogen gas containing the high-concentration VOC to be absorbed in the molecular sieve water absorption tank 35;
s6, closing the connection between the molecular sieve water absorption tank 35 and the dehydration tank desorption heater 63, enabling the nitrogen gas containing high-concentration VOC discharged from the molecular sieve water absorption tank 35 to pass through the condensing part 38, separating VOC from nitrogen after the VOC in the nitrogen gas containing high-concentration VOC is condensed by the condensing part 38, and discharging the condensed VOC from the condensing part 38;
s7, opening the stop valve 10 between the cold flow outlet two and the nitrogen gas discharge channel 31, and re-entering the nitrogen gas into the nitrogen gas discharge channel 31 after the VOC is separated by the condenser 38, and the nitrogen gas passes through the cooling zone 12 again from the nitrogen gas discharge channel 31 to start a new cycle.
The nitrogen gas is firstly introduced into the rotary wheel adsorber 1, oxygen gas is discharged from the circulating part and the water recovery part, the gas with high VOC concentration is discharged into the rotary wheel adsorber 1 after the oxygen content reaches the standard, VOC is left on the rotary wheel adsorber 1, qualified waste gas is discharged, the circulating part is started, the nitrogen gas left in the closed-loop circulating part passes through the circulating part, the nitrogen gas is subjected to moisture separation after being desorbed from the rotary wheel adsorber 1, then the VOC separation is carried out, finally the qualified nitrogen gas enters the nitrogen gas discharge channel 31 again, and new circulation is started.
The partial nitrogen gas that the nitrogen gas discharged passageway 31 passes through reposition of redundant personnel passageway 61 simultaneously, start molecular sieve holds in the palm desorption fan 67, nitrogen gas passes through dehydration jar desorption heater 63 by reposition of redundant personnel passageway 61, nitrogen gas absorbs the heat in dehydration jar desorption heater 63, the nitrogen gas that has absorbed the heat passes through molecular sieve water absorption tank 35, the moisture that has the heat in with molecular sieve water absorption tank 35 desorbs out, nitrogen gas after having absorbed the moisture in molecular sieve water absorption tank 35 passes through preceding table cold 65 and middle table cold 66 in the cooling module, moisture in the nitrogen gas of moisture condenses in the cooling module, the water of condensation is discharged from the cooling module, nitrogen gas after the cooling module enters into in the molecular sieve dehydration jar 34. The nitrogen discharged into the channel 31 passes through the diversion channel 61, the nitrogen enters the water recovery part to desorb the moisture in the molecular sieve dehydration tank 34, the nitrogen absorbing the moisture passes through the condensation component, the moisture is condensed in the cooling component, the dehydrated nitrogen enters the molecular sieve water absorption tank 35, and the nitrogen returns to the circulation part to continue circulation.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a VOC waste gas recovery processing system which characterized in that: comprises a rotating wheel absorber (1), an exhaust gas inlet channel (21) and an exhaust gas outlet channel (22);
the rotary wheel adsorber (1) comprises an adsorption area (11), the outlet of the waste gas discharge channel (21) is connected with the inlet of the adsorption area (11), and the outlet of the adsorption area (11) is connected with the inlet of the waste gas discharge channel (22);
the system also comprises a circulating part, wherein the circulating part comprises a nitrogen discharging channel (31), a regeneration heating channel (32), a molecular sieve dehydration tank (34) and a condensing part (38); the rotary wheel adsorber (1) also comprises a cooling zone (12) and a regeneration zone (13);
the inlet of the nitrogen discharging channel (31) is communicated with the inlet of the cooling area (12), the outlet of the cooling area (12) is communicated with the inlet of the regeneration heating channel (32), the outlet of the regeneration heating channel (32) is communicated with the inlet of the regeneration area (13), the outlet of the regeneration area (13) is communicated with the inlet of the molecular sieve dehydration tank (34), the outlet of the molecular sieve dehydration tank (34) is communicated with the condensing part (38), and the gas outlet of the condensing part (38) is communicated with the nitrogen discharging channel (31).
2. A VOC exhaust gas recovery processing system according to claim 1, wherein: the device is characterized by further comprising a water recovery part, wherein the water recovery part comprises a flow dividing channel (61), a dehydration tank desorption heater (63) and a backflow channel (62), an inlet of the flow dividing channel (61) is communicated with a nitrogen discharge channel (31), an outlet of the flow dividing channel (61) is communicated with an inlet of the dehydration tank desorption heater (63), an outlet of the dehydration tank desorption heater (63) is communicated with an outlet of the molecular sieve dehydration tank (34), and an inlet of the molecular sieve dehydration tank (34) is communicated with an inlet of the backflow channel (62).
3. A VOC exhaust gas recovery processing system according to claim 2, wherein: the water recovery section further comprises a cooling assembly, the outlet of the return channel (62) is connected to the inlet of the cooling assembly, and the outlet of the cooling assembly is connected to the inlet of the molecular sieve dewatering tank (34).
4. A VOC exhaust gas recovery processing system according to claim 3, wherein: the system also comprises a molecular sieve water absorption tank (35), wherein an inlet of the molecular sieve water absorption tank (35) is also communicated with an outlet of the regeneration zone (13), and an outlet of the molecular sieve water absorption tank (35) is also communicated with an inlet of the condensing part (38);
the water recovery part also comprises a dehydration tank recovery channel (64), the outlet of the dehydration tank desorption heater (63) is simultaneously communicated with the outlet of the molecular sieve water absorption tank (35), the inlet of the molecular sieve water absorption tank (35) is communicated with the inlet of the dehydration tank recovery channel (64), and the outlet of the dehydration tank recovery channel (64) is communicated with the return channel (62).
5. A VOC waste gas recovery processing system as claimed in claim 4, wherein: the heat recovery system further comprises a heat regenerator (4), wherein the heat regenerator (4) comprises a cold flow inlet I, a cold flow outlet I, a cold flow inlet II and a cold flow outlet II;
the first cold flow inlet is independently communicated with the first cold flow outlet, and the second cold flow inlet is independently communicated with the second cold flow outlet;
the first cold flow inlet is communicated with outlets of the molecular sieve dehydration tank (34) and the molecular sieve water absorption tank (35) together, the first cold flow outlet is communicated with an inlet of a condensing piece (38), an outlet of the condensing piece (38) is communicated with the second cold flow inlet, and the second cold flow outlet is communicated with a nitrogen discharge channel (31).
6. A VOC exhaust gas recovery processing system according to claim 3, wherein: the inlet of the cooling assembly is simultaneously communicated with the outlet of the regeneration zone (13).
7. The VOC exhaust gas recovery processing system according to claim 1, wherein: the gas discharged from the inlet of the nitrogen gas discharge channel (31) is nitrogen gas.
8. A VOC exhaust gas recovery processing system according to claim 1, wherein: the second cold flow outlet is simultaneously communicated with the waste gas discharge channel (21); the oxygen content in the circulating part and the water recovery part is lower than the designated concentration, and nitrogen is introduced into the additional gas discharge channel (31); the oxygen content in the circulation part and the water recovery part is higher than the specified concentration, and the introduction of nitrogen into the additional gas discharge passage (31) is stopped.
9. A VOC exhaust gas recovery processing method applied to the VOC exhaust gas recovery processing system according to any one of claims 1 to 8, comprising the steps of:
s1, opening an opening at the joint of the cold flow outlet II and the waste gas discharge channel (21), introducing nitrogen into the nitrogen discharge channel (31), wherein the nitrogen respectively passes through the rotary wheel adsorber (1), the circulating part and the water recovery part, when the oxygen content in the rotary wheel adsorber (1), the circulating part and the water recovery part is reduced to a specified concentration, closing the opening at the joint of the cold flow outlet II and the waste gas discharge channel (21), stopping introducing the nitrogen into the nitrogen discharge channel (31), and the circulating part forms a closed loop again;
s2, introducing VOC-containing waste gas into the waste gas discharge channel (21), adsorbing VOC on the rotary wheel adsorber (1) after the VOC-containing waste gas passes through the adsorption area (11), and discharging the purified waste gas from the waste gas discharge channel (22);
s3, the rotary wheel absorber (1) works to transfer the VOC adsorbed on the adsorption area (11) to the regeneration area (13), nitrogen discharged into the channel (31) passes through the cooling area (12), the nitrogen passing through the outlet of the cooling area (12) absorbs the heat energy of the cooling area (12) and then passes through the regeneration area (13), and the nitrogen passes through the outlet of the regeneration area (13) to carry away the VOC attached in the regeneration area (13) to form high-concentration VOC nitrogen;
s4, enabling the nitrogen carrying the VOC absorbed from the regeneration area (13) to pass through a cooling assembly, primarily cooling the nitrogen containing high-concentration VOC in the cooling assembly, condensing part of water in the nitrogen containing high-concentration VOC through the cooling assembly, separating the condensed water from the nitrogen, and discharging the condensed water from the cooling assembly;
s5, the nitrogen gas containing the high-concentration VOC after the part of water is separated from the cooling assembly passes through a molecular sieve water absorption tank (35), and the residual water in the nitrogen gas containing the high-concentration VOC is absorbed in the molecular sieve water absorption tank (35);
s6, the nitrogen containing high-concentration VOC discharged from the water absorption tank passes through a condensing part (38), VOC in the nitrogen containing high-concentration VOC is condensed through the condensing part (38) and separated from the nitrogen, and the condensed VOC is discharged from the condensing part (38);
s7, the nitrogen with VOC separated by the condensing element (38) enters the nitrogen discharging channel (31) again, and the nitrogen is discharged into the channel (31) by the nitrogen and passes through the cooling area (12) again, and a new cycle is started.
10. The method of claim 9 for recovering and treating VOC exhaust gas, further comprising the steps of:
the nitrogen is discharged into partial nitrogen of passageway (31) and is passed through reposition of redundant personnel passageway (61) simultaneously, nitrogen is by reposition of redundant personnel passageway (61) through drain sump desorption heater (63), nitrogen absorbs the heat in drain sump desorption heater (63), the nitrogen that has absorbed heat passes through molecular sieve water absorption tank (35), the moisture that has absorbed molecular sieve water absorption tank (35) is desorbed out with thermal nitrogen, the nitrogen after having absorbed the moisture in molecular sieve water absorption tank (35) passes through cooling module, moisture in the nitrogen that contains water condenses in the cooling module, the water of condensation discharges from cooling module, the nitrogen after the cooling module gets into in molecular sieve drain sump (34).
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