CN110542304B - Zero emission and solvent recovery system for waste gas and pollutant of steam stripping machine - Google Patents
Zero emission and solvent recovery system for waste gas and pollutant of steam stripping machine Download PDFInfo
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- CN110542304B CN110542304B CN201910924212.1A CN201910924212A CN110542304B CN 110542304 B CN110542304 B CN 110542304B CN 201910924212 A CN201910924212 A CN 201910924212A CN 110542304 B CN110542304 B CN 110542304B
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- 239000002904 solvent Substances 0.000 title claims abstract description 108
- 239000002912 waste gas Substances 0.000 title claims abstract description 97
- 238000011084 recovery Methods 0.000 title claims abstract description 42
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 24
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 107
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000003795 desorption Methods 0.000 claims description 23
- 238000001179 sorption measurement Methods 0.000 claims description 23
- 238000003303 reheating Methods 0.000 claims description 14
- 235000019764 Soybean Meal Nutrition 0.000 claims description 8
- 239000004455 soybean meal Substances 0.000 claims description 8
- 239000003463 adsorbent Substances 0.000 claims description 5
- 239000000356 contaminant Substances 0.000 claims description 4
- 239000012855 volatile organic compound Substances 0.000 abstract description 17
- 244000046052 Phaseolus vulgaris Species 0.000 abstract description 12
- 235000010627 Phaseolus vulgaris Nutrition 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000001502 supplementing effect Effects 0.000 description 7
- 238000002386 leaching Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- 230000007306 turnover Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000019198 oils Nutrition 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- PNHVXXUMHKJRKJ-RPSULYRYSA-N [(Z)-[(2Z,3E)-2,3-bis(hydroxyimino)-5,5-dimethylcyclohexylidene]amino]thiourea Chemical compound CC1(C)C\C(=N/O)\C(=N/O)\C(\C1)=N/NC(N)=S PNHVXXUMHKJRKJ-RPSULYRYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a system for zero emission of waste gas and pollutants of a steam-stripping machine and recovery of solvents, which comprises a wet bean pulp drying and cooling mechanism, wherein the wet bean pulp drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom; two sets of waste gas circulation systems; and the exhaust gas circulation system is used for cooling, dehumidifying and recovering solvent from exhaust gas discharged from the first hot air inlet and outlet layer and the second hot air inlet and outlet layer and respectively guiding the exhaust gas into the first steam heating component and the second steam heating component which are connected with respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer. The system realizes the full recovery of the solvent and reduces the running cost of enterprises; zero emission of atmospheric pollutants such as volatile organic compounds of the system and the like thoroughly solves the problem of odor disturbing people; the system adopts a wind net self-balancing system, and can realize automatic system compensation and exhaust to maintain the balanced operation of the system.
Description
Technical Field
The invention relates to the technical field of grease leaching DTDC evaporation waste gas pollutant control, energy conservation and emission reduction, in particular to a system for zero emission of waste gas and pollutants and solvent recovery of a steam stripping machine.
Background
In the oil processing industry, a leaching plant is an important section of an oil production process, wherein a DTDC evaporator DC is a key device in a vegetable oil processing plant. The DCDT layer of the steam stripping machine uses steam to remove most of solvent in the material pulp, and the DCD layer of the steam stripping machine is a drying cooling layer, and mainly uses hot air to remove water in the material pulp, so that the water content in the material pulp is kept at about 13%, and qualified material pulp is obtained.
The DC section of the steam stripping machine is generally divided into four layers by air inlet and outlet, the front three layers are provided with steam heaters for increasing the temperature of hot air, and the last layer is a cooling layer. Air is pressurized by a blowing fan and enters a DC layer of a steam stripping machine, and is fully contacted with the material pulp, moisture and partial solvent in the material pulp are removed, then the material pulp is discharged, dust is removed by a cyclone dust collector and then is discharged to the atmosphere, the main components of discharged waste gas are moisture, dust and VOC (solvent) components, and the waste gas has serious peculiar smell and affects the life of surrounding residents of enterprises.
At present, the waste gas discharged from the DC section of the steam stripping machine is treated mainly by adopting a spray cooling mode, so that the discharge of VOC in the waste gas is reduced, and the discharge of waste gas odor is reduced, but the pollution and odor problems cannot be fundamentally solved.
Disclosure of Invention
The invention provides a system for zero emission of waste gas and pollutants and recovery of solvent of a steam stripping machine.
The invention provides the following scheme:
a system for zero emission of waste gas and pollutants and recovery of solvent in a steam stripping machine, comprising:
the wet soybean meal drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom;
two sets of waste gas circulation systems;
the exhaust gas circulation system is used for cooling, dehumidifying and recycling the exhaust gas discharged by the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and then respectively guiding the exhaust gas into a first steam heating component and a second steam heating component which are connected with respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating component and the second steam heating component are used for reheating the exhaust gas subjected to cooling, dehumidifying and recycling the solvent, and then guiding the exhaust gas to respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
the other set of exhaust gas circulation system is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer respectively after cooling, dehumidifying and solvent recycling treatment, and guiding the exhaust gas subjected to cooling, dehumidifying and solvent recycling treatment into the air inlet of the third hot air inlet and outlet layer after reheating.
Preferably: the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the booster fan, and the air outlet of the booster fan is connected with the cold source inlet of the first heat exchanger;
wherein a set of heat source inlets of the first heat exchanger contained in the exhaust gas circulation system are connected with the exhaust gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating component and the second steam heating component;
the other set of the waste gas circulation system comprises a heat source inlet of the first heat exchanger connected with the waste gas discharge port of the third hot air inlet and outlet layer and the cold air inlet and outlet layer; and the cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and the air inlet of the cold air inlet and outlet layer.
Preferably: and a chilled water heat exchanger is connected between the second heat exchanger and the booster fan.
Preferably: and a solvent adsorption and desorption assembly is arranged between the booster fan and the first heat exchanger.
Preferably: the air outlet of the booster fan is respectively connected with the air inlet of the solvent adsorption and desorption assembly and the cold source inlet of the first heat exchanger through two pipelines; and an air outlet of the solvent adsorption and desorption assembly is connected with a cold source inlet of the first heat exchanger.
Preferably: the solvent adsorption and desorption assembly comprises an adsorbent for realizing adsorption and a steam desorption assembly for realizing desorption.
Preferably: and the two sets of waste gas circulation systems respectively comprise the solvent adsorption and desorption components which are respectively connected with the solvent recovery component.
Preferably: the solvent recovery assembly is connected with an exhaust gas discharge assembly, and inlet gas of the booster fan is provided with an air supplementing assembly.
A system for zero emission of off-gas, contaminants and solvent recovery from a stripper, the system comprising:
the wet soybean meal drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom;
an exhaust gas circulation system; the exhaust gas circulation system is used for cooling, dehumidifying and recovering solvent from exhaust gas discharged by the first hot air inlet and outlet layer and respectively guiding the exhaust gas into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the exhaust gas subjected to cooling, dehumidifying and recovering solvent and guiding the reheated exhaust gas into the air inlet of the third hot air inlet and outlet layer;
the first booster fan is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into the first steam heating component and the second steam heating component which are connected with the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and the first steam heating component and the second steam heating component are used for guiding the exhaust gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer after reheating.
Preferably: the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a second booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the second booster fan, and the air outlet of the second booster fan is connected with the cold source inlet of the first heat exchanger;
the air outlet of the first booster fan is connected with the cold source inlet of the first heat exchanger, and the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating assembly and the second steam heating assembly; and the air outlets of the second booster fans are distributed in the third steam adding component and the air inlets of the cold air inlet and outlet layers to be connected.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, a system for zero emission of waste gas and pollutants and recovery of solvent of a steam-stripping machine can be realized, and in one implementation mode, the system can comprise a wet bean pulp drying and cooling mechanism, wherein the wet bean pulp drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom; two sets of waste gas circulation systems; the exhaust gas circulation system is used for cooling, dehumidifying and recycling the exhaust gas discharged by the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and then respectively guiding the exhaust gas into a first steam heating component and a second steam heating component which are connected with respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating component and the second steam heating component are used for reheating the exhaust gas subjected to cooling, dehumidifying and recycling the solvent, and then guiding the exhaust gas to respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; the other set of exhaust gas circulation system is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer respectively after cooling, dehumidifying and solvent recycling treatment, and guiding the exhaust gas subjected to cooling, dehumidifying and solvent recycling treatment into the air inlet of the third hot air inlet and outlet layer after reheating. The system realizes the full recovery of the solvent and reduces the running cost of enterprises; zero emission of atmospheric pollutants such as volatile organic compounds of the system and the like thoroughly solves the problem of odor disturbing people; the system adopts a wind net self-balancing system, and can realize automatic system compensation and exhaust to maintain the balanced operation of the system.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic process diagram of a system for zero emission of waste gas and contaminants and solvent recovery from a stripper according to example 1 of the present invention;
fig. 2 is a schematic process diagram of a system for zero emission of waste gas and contaminants and solvent recovery from a stripper according to embodiment 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Aiming at the defects and problems of the prior art and technology, the embodiment of the invention provides a set of exhaust gas and pollutant zero-emission and solvent recovery system with wind net self-balancing circulation for the DC of the steam stripping machine.
According to the characteristics of a DTDC (digital direct current) steam-off machine DC operation system and the exhaust gas emission condition, a set of steam-off machine DC device exhaust gas circulation zero-emission system is specially designed, and the DC device of the system is utilized to realize the exhaust gas circulation utilization and exhaust gas zero emission; the system condenses out the moisture in the waste gas in a cooling mode, reduces the moisture content of the waste gas, and can meet the recycling requirement of the system according to the fact that the moisture content of common gases at recycling positions is not equal to 5-30g/m < 3 >; the system adopts a special adsorption device to recycle the solvent in the waste gas, and the solvent returns to the solvent recycling device of the leaching process; the system recovers the process water, and the steam after the process water is recovered is returned to the DTDC system for recycling or other production processes; through the operation of the system that this application provided, can realize DC device waste gas zero release, solvent in the waste gas obtains all retrieving, leaches the dry cooling mechanism of wet soybean meal of workshop and includes first hot-blast business turn over layer, second hot-blast business turn over layer, third hot-blast business turn over layer and cold wind business turn over layer (CY 311-CY 314) waste gas zero release peculiar smell thoroughly eliminates, guarantees soybean meal product solvent content and humidity up to standard simultaneously.
The system takes DC (direct current) of a DC (direct current) evaporator as a center, consists of a first heat exchanger (a preheater), a second heat exchanger (air cooling or water cooling), a chilled water heat exchanger, a solvent recovery device, a booster fan (FN 305A/B) and a system pipeline air door, is provided with an air supplementing port and an outer discharging port to ensure stable system air quantity, and the whole system can realize self-adjustment of an air net according to the temperature, humidity, VOC concentration and system resistance of the waste gas, and finally realizes zero emission of the waste gas and the pollutant and solvent recovery.
Example 1
Referring to fig. 1, a system for zero emission of waste gas and pollutants and recovery of solvent in a steam-stripping machine provided by the embodiment 1 of the invention is shown in fig. 1, and comprises a wet bean pulp drying and cooling mechanism, wherein the wet bean pulp drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom;
two sets of waste gas circulation systems;
the exhaust gas circulation system is used for cooling, dehumidifying and recycling the exhaust gas discharged by the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and then respectively guiding the exhaust gas into a first steam heating component and a second steam heating component which are connected with respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating component and the second steam heating component are used for reheating the exhaust gas subjected to cooling, dehumidifying and recycling the solvent, and then guiding the exhaust gas to respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
the other set of exhaust gas circulation system is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer respectively after cooling, dehumidifying and solvent recycling treatment, and guiding the exhaust gas subjected to cooling, dehumidifying and solvent recycling treatment into the air inlet of the third hot air inlet and outlet layer after reheating.
Further, the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the booster fan, and the air outlet of the booster fan is connected with the cold source inlet of the first heat exchanger;
wherein a set of heat source inlets of the first heat exchanger contained in the exhaust gas circulation system are connected with the exhaust gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating component and the second steam heating component;
the other set of the waste gas circulation system comprises a heat source inlet of the first heat exchanger connected with the waste gas discharge port of the third hot air inlet and outlet layer and the cold air inlet and outlet layer; and the cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and the air inlet of the cold air inlet and outlet layer.
And a chilled water heat exchanger is connected between the second heat exchanger and the booster fan. And a solvent adsorption and desorption assembly is arranged between the booster fan and the first heat exchanger. The air outlet of the booster fan is respectively connected with the air inlet of the solvent adsorption and desorption assembly and the cold source inlet of the first heat exchanger through two pipelines; and an air outlet of the solvent adsorption and desorption assembly is connected with a cold source inlet of the first heat exchanger. The solvent adsorption and desorption assembly comprises an adsorbent for realizing adsorption and a steam desorption assembly for realizing desorption. And the two sets of waste gas circulation systems respectively comprise the solvent adsorption and desorption components which are respectively connected with the solvent recovery component. The solvent recovery assembly is connected with an exhaust gas discharge assembly, and inlet gas of the booster fan is provided with an air supplementing assembly.
According to the characteristics of waste gas discharged by CY311-CY314, the waste gas with high humidity and high VOCs concentration of CY311 and CY312 and the waste gas with relatively low humidity and VOCs concentration of CY313 and CY314, the invention respectively treats the CY311 and CY312 and the CY313 and CY314 as two units with the same process.
And after the waste gas exhausted by the DC evaporator is purified by the salon, the waste gas and the cooled and dehumidified waste gas are subjected to heat exchange by the preheater, so that the gas temperature entering the DC system is increased, the steam consumption of system heating is saved, and the temperature and the humidity of the waste gas are primarily reduced.
The waste gas subjected to primary heat exchange by the first heat exchanger enters the second heat exchanger (the second heat exchanger), the second heat exchanger can be set to be an air-cooled heat exchanger or a water-cooled heat exchanger according to the specific conditions of users, the temperature of the waste gas is further reduced through the second heat exchange, and the moisture in the waste gas is condensed. In areas with lower air temperature in winter, when air cooling heat exchange is adopted, the moisture content of the waste gas can be directly reduced to the index allowed by the system, so that the cost of the subsequent chilled water heat exchange is saved.
And if the humidity of the waste gas after the secondary heat exchange is further reduced and the system recycling requirement is not met, the temperature of the waste gas is further reduced by utilizing the chilled water heat exchanger through chilled water, so that the moisture in the waste gas is condensed, and the moisture content of the waste gas meets the system recycling requirement. The chilled water heat exchanger consists of a chilled water preparation device, a matched water cooling device and a heat exchange device.
The waste gas dehumidified by the chilled water heat exchanger has the lowest temperature and the moisture content meeting the recycling requirement of the system. In order to raise the temperature of the gas entering the system, the consumption of heating steam is reduced, and the waste gas enters the DC steaming device after being subjected to heat exchange with the waste gas exiting the system through the preheater.
The recycling of the waste gas can increase the VOC concentration in the gas (mainly solvent n-hexane), if the VOC concentration is not reduced, the solvent content in the bean pulp product can exceed the standard due to rising, so the invention is provided with a solvent recycling device for recycling the solvent in the waste gas, and the recycling waste gas concentration is reduced, thereby ensuring the qualification of the bean pulp product. The invention adopts 10-20% gas quantity to recycle the solvent by utilizing an adsorption and desorption mode, thereby avoiding the rise of investment and operation cost caused by full gas quantity adsorption. The solvent recovery device adopts absorption materials such as a hydrophobic molecular sieve and the like as an adsorbent, the absorption materials are desorbed by utilizing steam, and the desorbed steam and solvent enter a TK340 solvent recovery device which also utilizes the steam to recover the solvent in a leaching system, so that the solvent is stably and completely recovered.
In order to ensure balance matching of the gas required by the system, the system provided by the application is provided with an air supplementing port and an exhaust gas outlet so as to cope with the change of the gas required by the system when the production of the system changes. The air supplementing port is arranged at the inlet of the booster fan (FN 305A/B), the air inlet quantity is controlled through an automatic air door, when the air is needed to be supplemented, the air door can be automatically opened, the opening degree and the closing time of the air door are automatically adjusted according to the air quantity and the resistance parameters of the system, and the air door is in a closed state during normal operation. The exhaust gas outer discharge port is arranged behind the solvent recovery device, when the air volume required by the production system is reduced, the exhaust gas outer discharge port is opened to discharge a certain amount of exhaust gas outside the system, the air volume balance of the system is ensured, and the VOC concentration index of the exhaust gas is ensured to meet the emission standard requirement. When waste gas is required to be discharged, the outer exhaust door can be automatically opened, the opening degree and the closing time of the air door are automatically adjusted according to the system air quantity and the resistance parameter, and the air door is in a closed state during normal operation.
In the system, each heat exchange device cools and dehumidifies waste gas, condensed water is separated out, the condensed water separated out by the system is the condensed water left in soybean meal when the DT system steam is used for removing the solvent, the condensed water separated out by the system contains a certain content of solvent, the condensed water is collected and then enters a TK340 solvent recovery device, the solvent in the condensed water is recovered, and the de-dissolved condensed water enters a process system for recycling.
The system provided by the application is provided with monitoring sensing devices such as system temperature, humidity, VOC concentration, resistance and flow, and is integrated into an automatic control device of the system, and meanwhile, the automatic control device of the system is used for coupling the zero emission of waste gas and pollutants, the solvent recovery system and the production system data, and controlling the start, stop and operation adjustment of all equipment in the system.
Example 2
Referring to fig. 2, a system for zero emission of waste gas and pollutants and recovery of solvent in a steam-stripping machine provided in embodiment 2 of the present invention, as shown in fig. 2, comprises a wet bean pulp drying and cooling mechanism, wherein the wet bean pulp drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer, which are sequentially arranged from top to bottom;
an exhaust gas circulation system; the exhaust gas circulation system is used for cooling, dehumidifying and recovering solvent from exhaust gas discharged by the first hot air inlet and outlet layer and respectively guiding the exhaust gas into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the exhaust gas subjected to cooling, dehumidifying and recovering solvent and guiding the reheated exhaust gas into the air inlet of the third hot air inlet and outlet layer;
the first booster fan is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into the first steam heating component and the second steam heating component which are connected with the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and the first steam heating component and the second steam heating component are used for guiding the exhaust gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer after reheating.
Further, the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a second booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the second booster fan, and the air outlet of the second booster fan is connected with the cold source inlet of the first heat exchanger;
the air outlet of the first booster fan is connected with the cold source inlet of the first heat exchanger, and the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating assembly and the second steam heating assembly; and the air outlets of the second booster fans are distributed in the third steam adding component and the air inlets of the cold air inlet and outlet layers to be connected.
According to the DTDC steam stripping DC operation waste gas emission condition and the characteristic that the humidity and VOCs concentration of CY313 and CY314 waste gas are relatively low, when the moisture content of the CY313 and CY314 waste gas meets the recycling requirement of a DC system, the CY313 and CY314 waste gas is directly recycled to the upper layer of DC for stripping and is discharged through the CY311 and the CY312, and then the CY311 and the CY312 waste gas are subjected to dehumidification treatment to meet the stripping recycling requirement of the lower layer of DC, and meanwhile, the solvent in part of the CY311 and the CY312 waste gas is recycled by using a solvent recycling device.
The scheme provided by the embodiment 2 of the application can simplify the system process, reduce the system investment and the operation cost, and also realize zero emission of waste gas and pollutants and solvent recovery of the DC device of the steam stripping machine.
The waste gas of CY313 and CY314 discharged from the DC of the steam stripping machine is purified by a salon, and then enters the DC of the steam stripping machine after being subjected to heat exchange with the waste gas of CY311 and CY312 by a first fan (FN 305A) of a booster fan, and is discharged by the CY311 and CY312, and then enters a second heat exchanger (a secondary heat exchanger).
The waste gas subjected to primary heat exchange through the first heat exchanger (preheater) enters the second heat exchanger, the second heat exchanger can be set to be an air-cooled heat exchanger or a water-cooled heat exchanger according to the specific conditions of users, the temperature of the waste gas is further reduced through the second heat exchange, and the moisture in the waste gas is condensed. In areas with lower air temperature in winter, when air cooling heat exchange is adopted, the moisture content of the waste gas can be directly reduced to the index allowed by the system, so that the cost of the subsequent chilled water heat exchange is saved.
And if the humidity of the waste gas after the secondary heat exchange is further reduced and the system recycling requirement is not met, the temperature of the waste gas is further reduced by utilizing the chilled water heat exchanger through chilled water, so that the moisture in the waste gas is condensed, and the moisture content of the waste gas meets the system recycling requirement. The chilled water heat exchanger consists of a chilled water preparation device, a matched water cooling device and a heat exchange device.
The waste gas dehumidified by the chilled water heat exchanger has the lowest temperature and the moisture content meeting the recycling requirement of the system. In order to raise the temperature of the gas entering the system, the consumption of heating steam is reduced, and the waste gas enters the DC steaming device after being subjected to heat exchange with the waste gas exiting the system through the preheater.
The recycling of the waste gas can increase the VOC concentration in the gas (mainly solvent n-hexane), if the VOC concentration is not reduced, the solvent content in the bean pulp product can exceed the standard due to rising, so the invention is provided with a solvent recycling device for recycling the solvent in the waste gas, and the recycling waste gas concentration is reduced, thereby ensuring the qualification of the bean pulp product. The invention adopts 10-20% gas quantity to recycle the solvent by utilizing an adsorption and desorption mode, thereby avoiding the rise of investment and operation cost caused by full gas quantity adsorption. The solvent recovery device adopts absorption materials such as a hydrophobic molecular sieve and the like as an adsorbent, the absorption materials are desorbed by utilizing steam, and the desorbed steam and solvent enter a TK340 solvent recovery device which also utilizes the steam to recover the solvent in a leaching system, so that the solvent is stably and completely recovered.
In order to ensure balance matching of the gas required by the system, the system provided by the application is provided with an air supplementing port and an exhaust gas outlet so as to cope with the change of the gas required by the system when the production of the system changes. The air supplementing port is arranged at the inlet of the first booster fan/the second booster fan (FN 305A/B), the air inlet quantity is controlled through an automatic air door, when the air is needed to be supplemented, the air door can be automatically opened, the opening degree and the closing time of the air door are automatically adjusted according to the air quantity and the resistance parameters of the system, and the air door is in a closed state during normal operation. The exhaust gas outer discharge port is arranged behind the solvent recovery device, when the air volume required by the production system is reduced, the exhaust gas outer discharge port is opened to discharge a certain amount of exhaust gas outside the system, the air volume balance of the system is ensured, and the VOC concentration index of the exhaust gas is ensured to meet the emission standard requirement. When waste gas is required to be discharged, the outer exhaust door can be automatically opened, the opening degree and the closing time of the air door are automatically adjusted according to the system air quantity and the resistance parameter, and the air door is in a closed state during normal operation.
In the system, each heat exchange device cools and dehumidifies waste gas, condensed water is separated out, the condensed water separated out by the system is the condensed water left in soybean meal when the DT system steam is used for removing the solvent, the condensed water separated out by the system contains a certain content of solvent, the condensed water is collected and then enters a TK340 solvent recovery device, the solvent in the condensed water is recovered, and the de-dissolved condensed water enters a process system for recycling.
The system provided by the application is provided with monitoring sensing devices such as system temperature, humidity, VOC concentration, resistance and flow, and is integrated into an automatic control device of the system, and meanwhile, the automatic control device of the system is used for coupling the zero emission of waste gas and pollutants, the solvent recovery system and the production system data, and controlling the start, stop and operation adjustment of all equipment in the system.
The application provides a steam stripping waste gas, pollutant zero release and solvent recovery system have following advantage: the system realizes the recycling of waste gas of the DC system of the steam stripping machine and zero emission of the waste gas; the system realizes the full recovery of the solvent and reduces the running cost of enterprises; zero emission of atmospheric pollutants such as volatile organic compounds of the system and the like thoroughly solves the problem of odor disturbing people; the system adopts a wind net self-balancing system, and can realize automatic system compensation and exhaust to maintain the balanced operation of the system.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A system for zero emission of waste gas and pollutants and solvent recovery of a steam stripping machine, which is characterized by comprising:
the wet soybean meal drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom;
two sets of waste gas circulation systems;
the exhaust gas circulation system is used for cooling, dehumidifying and recycling the exhaust gas discharged by the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and then respectively guiding the exhaust gas into a first steam heating component and a second steam heating component which are connected with respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating component and the second steam heating component are used for reheating the exhaust gas subjected to cooling, dehumidifying and recycling the solvent, and then guiding the exhaust gas to respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
the other set of exhaust gas circulation system is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer respectively after cooling, dehumidifying and solvent recycling treatment, and guiding the exhaust gas subjected to cooling, dehumidifying and solvent recycling treatment into the air inlet of the third hot air inlet and outlet layer after reheating.
2. The system for zero emission of off-gas and contaminants and solvent recovery according to claim 1, wherein said off-gas circulation system includes a first heat exchanger, a second heat exchanger and a booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the booster fan, and the air outlet of the booster fan is connected with the cold source inlet of the first heat exchanger;
wherein a set of heat source inlets of the first heat exchanger contained in the exhaust gas circulation system are connected with the exhaust gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating component and the second steam heating component;
the other set of the waste gas circulation system comprises a heat source inlet of the first heat exchanger connected with the waste gas discharge port of the third hot air inlet and outlet layer and the cold air inlet and outlet layer; and the cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and the air inlet of the cold air inlet and outlet layer.
3. The system for zero emission of waste gas and pollutants and solvent recovery of claim 2, wherein a chilled water heat exchanger is connected between the second heat exchanger and the booster fan.
4. The system of claim 2, wherein a solvent adsorption and desorption assembly is disposed between the booster fan and the first heat exchanger.
5. The system for zero emission of waste gas and pollutants and recovery of solvent from a steam stripping machine according to claim 4, wherein the air outlet of the booster fan is connected with the air inlet of the solvent adsorption and desorption assembly and the cold source inlet of the first heat exchanger through two pipelines respectively; and an air outlet of the solvent adsorption and desorption assembly is connected with a cold source inlet of the first heat exchanger.
6. The system of claim 5, wherein the solvent adsorption and desorption assembly comprises an adsorbent for effecting adsorption and a vapor desorption assembly for effecting desorption.
7. The system of claim 5, wherein each of the two sets of exhaust gas recirculation systems comprises the solvent adsorption and desorption assembly separately coupled to a solvent recovery assembly.
8. The system of claim 7, wherein the solvent recovery assembly is connected to an exhaust gas outlet assembly, and the booster fan inlet air is provided with an air make-up assembly.
9. A system for zero emission of waste gas and pollutants and solvent recovery of a steam stripping machine, which is characterized by comprising:
the wet soybean meal drying and cooling mechanism comprises a first hot air inlet and outlet layer, a second hot air inlet and outlet layer, a third hot air inlet and outlet layer and a cold air inlet and outlet layer which are sequentially arranged from top to bottom;
an exhaust gas circulation system; the exhaust gas circulation system is used for cooling, dehumidifying and recovering solvent from exhaust gas discharged by the first hot air inlet and outlet layer and respectively guiding the exhaust gas into a third steam heating assembly connected with the air inlet of the third hot air inlet and outlet layer and into the air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the exhaust gas subjected to cooling, dehumidifying and recovering solvent and guiding the reheated exhaust gas into the air inlet of the third hot air inlet and outlet layer;
the first booster fan is used for guiding the exhaust gas exhausted by the third hot air inlet and outlet layer and the cold air inlet and outlet layer into the first steam heating component and the second steam heating component which are connected with the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and the first steam heating component and the second steam heating component are used for guiding the exhaust gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer after reheating.
10. The de-duplication waste gas, pollutant zero release and solvent recovery system of claim 9 wherein the waste gas circulation system comprises a first heat exchanger, a second heat exchanger, and a second booster fan; the heat source outlet of the first heat exchanger is connected with the heat source inlet of the second heat exchanger, the heat source outlet of the second heat exchanger is connected with the air inlet of the second booster fan, and the air outlet of the second booster fan is connected with the cold source inlet of the first heat exchanger;
the air outlet of the first booster fan is connected with the cold source inlet of the first heat exchanger, and the cold source outlet of the first heat exchanger is respectively connected with the air inlets of the first steam heating assembly and the second steam heating assembly; and the air outlets of the second booster fans are distributed in the third steam adding component and the air inlets of the cold air inlet and outlet layers to be connected.
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