CN110542304A - zero emission of desolventizer-toaster waste gas, pollutant and solvent recovery system - Google Patents
zero emission of desolventizer-toaster waste gas, pollutant and solvent recovery system Download PDFInfo
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- CN110542304A CN110542304A CN201910924212.1A CN201910924212A CN110542304A CN 110542304 A CN110542304 A CN 110542304A CN 201910924212 A CN201910924212 A CN 201910924212A CN 110542304 A CN110542304 A CN 110542304A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 166
- 239000002904 solvent Substances 0.000 title claims abstract description 118
- 238000011084 recovery Methods 0.000 title claims abstract description 69
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 33
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 37
- 235000019764 Soybean Meal Nutrition 0.000 claims abstract description 16
- 239000004455 soybean meal Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 230000007306 turnover Effects 0.000 claims description 24
- 238000007791 dehumidification Methods 0.000 claims description 22
- 238000003795 desorption Methods 0.000 claims description 22
- 238000001179 sorption measurement Methods 0.000 claims description 20
- 238000003303 reheating Methods 0.000 claims description 14
- 239000013589 supplement Substances 0.000 claims description 6
- 239000003463 adsorbent Substances 0.000 claims description 5
- 238000002336 sorption--desorption measurement Methods 0.000 claims 3
- 239000012855 volatile organic compound Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 15
- 238000004064 recycling Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 235000012054 meals Nutrition 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000002386 leaching Methods 0.000 description 5
- 244000046052 Phaseolus vulgaris Species 0.000 description 4
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000007664 blowing Methods 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
- 238000007599 discharging Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000008020 evaporation Effects 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
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 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
- 238000000746 purification Methods 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
- 230000001502 supplementing effect Effects 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
- -1 comprises moisture Substances 0.000 description 1
- 230000007547 defect Effects 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
- 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 an desolventizer-toaster and solvent recovery, which comprises a wet soybean meal drying and cooling mechanism, wherein 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 circulating systems; and the waste gas circulating system is used for cooling, dehumidifying and recovering a solvent from waste gas discharged from the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, and then respectively guiding the waste gas into a first steam heating assembly and a second steam heating assembly 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 operation cost of enterprises; zero emission of atmospheric pollutants such as system volatile organic compounds and the like is realized, and the problem of odor disturbing residents is thoroughly solved; the system adopts a wind network self-balancing system, and can realize the automatic compensation and exhaust of the system to maintain the balanced operation of the system.
Description
Technical Field
The invention relates to the technical field of control, energy conservation and emission reduction of oil leaching DTDC (direct Current distillation) evaporative waste gas pollutants, in particular to a zero emission and solvent recovery system of waste gas and pollutants of an evaporative water separator.
Background
in the grease processing industry, a leaching plant is an important section of an oil making process, wherein a DTDC (direct digital distillation) machine DC is a key device in a vegetable oil processing plant. The DCDT layer of the desolventizer-toaster utilizes steam to remove most of the solvent in the material meal, and the DC layer of the desolventizer-toaster is a drying and cooling layer and mainly utilizes hot air to remove water in the material meal so as to keep the water content in the material meal at about 13 percent, thereby obtaining qualified material meal.
the DC section of the desolventizer-toaster is generally divided into four layers by air inlet and outlet, the first three layers are provided with steam heaters to increase the temperature of hot air, and the last layer is a cooling layer. Air enters a DC layer of the desolventizer-toaster after being pressurized by a blow-off fan, is discharged after moisture and partial solvent in the material meal are removed after being fully contacted with the material meal, and is discharged to the atmosphere after being dedusted by a cyclone (cyclone dust collector), and the discharged waste gas mainly comprises moisture, dust and VOC (volatile organic compounds) components, has serious peculiar smell and affects the life of residents around enterprises.
At present, the waste gas discharged from the DC section of the desolventizer-toaster is treated by mainly adopting a spray cooling mode, thereby reducing the discharge of VOC in the waste gas and simultaneously reducing the peculiar smell of the waste gas, but the problems of pollution and peculiar smell cannot be fundamentally solved.
disclosure of Invention
The invention provides a zero emission and solvent recovery system for waste gas and pollutants of a desolventizer-toaster.
The invention provides the following scheme:
A zero emission and solvent recovery system of waste gas and pollutants of a desolventizer-toaster comprises:
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 circulating systems;
The waste gas circulation system is used for conducting cooling dehumidification and solvent recovery treatment on waste 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 waste gas to a first steam heating assembly and a second steam heating assembly which are connected with respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating assembly and the second steam heating assembly are used for reheating the cooled dehumidified waste gas and the solvent recovered waste gas and then guiding the reheated waste gas to respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
another set exhaust gas circulation system be used for with the hot-blast business turn over layer of third and cold wind business turn over layer exhaust waste gas cool off dehumidification and solvent recovery process after guide respectively to with in the third steam heating element that the hot-blast business turn over layer air inlet of third links to each other and guide extremely the air inlet on cold wind business turn over layer, third steam heating element is used for guiding after reheating to the waste gas after cooling dehumidification and solvent recovery process the air inlet on the hot-blast business turn over layer of third.
Preferably: the waste gas circulating system comprises a first heat exchanger, a second heat exchanger and a booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the booster fan, and an air outlet of the booster fan is connected with a cold source inlet of the first heat exchanger;
a heat source inlet of the first heat exchanger contained in one set of the waste gas circulating system is connected with waste gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; a cold source outlet of the first heat exchanger is respectively connected with air inlets of the first steam heating assembly and the second steam heating assembly;
A heat source inlet of the first heat exchanger contained in the other set of waste gas circulating system is connected with the third hot air inlet and outlet layer and a waste gas discharge port of the cold air inlet and outlet layer; and a cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and an 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 the gas outlet of the solvent adsorption and desorption assembly is connected with the 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 circulating 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 a waste gas discharge assembly, and the inlet gas of the booster fan is provided with an air supplement assembly.
a desolventizer-toaster exhaust, zero pollutant emission and solvent recovery system, 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 recirculation system; the waste gas circulating system is used for conducting cooling dehumidification and solvent recovery treatment on waste gas discharged from the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, then respectively guiding the waste gas into a third steam heating assembly connected with a third hot air inlet and outlet layer and guiding the waste gas to an air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the waste gas after cooling dehumidification and solvent recovery treatment and then guiding the waste gas to an air inlet of the third hot air inlet and outlet layer;
The first booster fan is used for guiding the third hot air inlet and outlet layer and the waste gas discharged from the cold air inlet and outlet layer into a first steam heating assembly and a second steam heating assembly 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, and the first steam heating assembly and the second steam heating assembly are used for reheating the waste gas and then guiding the waste gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer.
Preferably: the waste gas circulating system comprises a first heat exchanger, a second heat exchanger and a second booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the second booster fan, and an air outlet of the second booster fan is connected with a 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 component and the second steam heating component; and the air outlets of the second booster fans are distributed on the third steam adding assembly and connected with the air inlets of the cold air inlet and outlet layer.
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 of the desolventizer-toaster and solvent recovery can be realized, and in an implementation mode, the system can comprise a wet soybean meal drying and cooling mechanism, wherein 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 circulating systems; the waste gas circulation system is used for conducting cooling dehumidification and solvent recovery treatment on waste 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 waste gas to a first steam heating assembly and a second steam heating assembly which are connected with respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating assembly and the second steam heating assembly are used for reheating the cooled dehumidified waste gas and the solvent recovered waste gas and then guiding the reheated waste gas to respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; another set exhaust gas circulation system be used for with the hot-blast business turn over layer of third and cold wind business turn over layer exhaust waste gas cool off dehumidification and solvent recovery process after guide respectively to with in the third steam heating element that the hot-blast business turn over layer air inlet of third links to each other and guide extremely the air inlet on cold wind business turn over layer, third steam heating element is used for guiding after reheating to the waste gas after cooling dehumidification and solvent recovery process the air inlet on the hot-blast business turn over layer of third. The system realizes the full recovery of the solvent, thereby reducing the operation cost of enterprises; zero emission of atmospheric pollutants such as system volatile organic compounds and the like is realized, and the problem of odor disturbing residents is thoroughly solved; the system adopts a wind network self-balancing system, and can realize the automatic compensation and exhaust of the system to maintain the balanced operation of the system.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages 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 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a process diagram of a system for zero emission of waste gas and pollutants and solvent recovery of a desolventizer-toaster according to an embodiment 1 of the present invention;
Fig. 2 is a process diagram of a system for zero emission of exhaust gas and pollutants and solvent recovery of a desolventizer-toaster according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present 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 air network self-balancing circulation for a desolventizer-toaster DC.
According to the characteristics of a DC operation system of the DTDC desolventizer-toaster and the exhaust emission condition, a set of exhaust gas circulation zero-emission system of the DTDC desolventizer-toaster is specially designed, and the zero emission of exhaust gas which is recycled by utilizing the DC device of the DTDC desolventizer-toaster is realized; the system condenses moisture in the waste gas by a cooling mode, reduces the moisture content of the waste gas, and can meet the recycling requirement of the system when the moisture content of the gas is different from 5 to 30g/m3 according to the recycling position; the system adopts a special adsorption device to recover the solvent in the waste gas, and the solvent returns to the solvent recovery device of the leaching process; the system recovers process water, and after the process water is recovered and steam is generated, the steam returns to the DTDC system for recycling or is used for other production processes; through the operation of the system that this application provided, can realize DC device waste gas zero release, the solvent in the waste gas obtains whole recovery, leaches the first hot-blast business turn over layer, the hot-blast business turn over layer of second, the hot-blast business turn over layer of third and cold wind business turn over layer (CY 311-CY 314) waste gas zero release peculiar smell that workshop wet bean pulp drying cooling body included and thoroughly eliminates, guarantees that bean pulp product solvent content and humidity reach standard simultaneously.
this desolventizer-toaster waste gas, zero release of pollutant and solvent recovery system, use DC desolventizer-toaster DC as the center, by first heat exchanger (pre-heater), second heat exchanger (forced air cooling or water-cooling), chilled water heat exchanger, solvent recovery unit and booster fan (FN 305A/B) and system's pipeline air door constitution, the system is equipped with air supplement mouth and arranges the mouth outward and guarantees that the system's amount of wind is stable, whole system can realize the wind network self-balancing according to exhaust gas temperature, humidity, VOC concentration and system's resistance self-interacting, finally realize waste gas, zero release of pollutant and solvent recovery.
Example 1
Referring to fig. 1, a system for zero emission of waste gas and pollutants of an desolventizer-toaster and solvent recovery provided in embodiment 1 of the present invention is shown in fig. 1, and the system includes a wet soybean meal drying and cooling mechanism, where the wet soybean meal drying and cooling mechanism includes 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 circulating systems;
The waste gas circulation system is used for conducting cooling dehumidification and solvent recovery treatment on waste 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 waste gas to a first steam heating assembly and a second steam heating assembly which are connected with respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating assembly and the second steam heating assembly are used for reheating the cooled dehumidified waste gas and the solvent recovered waste gas and then guiding the reheated waste gas to respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
another set exhaust gas circulation system be used for with the hot-blast business turn over layer of third and cold wind business turn over layer exhaust waste gas cool off dehumidification and solvent recovery process after guide respectively to with in the third steam heating element that the hot-blast business turn over layer air inlet of third links to each other and guide extremely the air inlet on cold wind business turn over layer, third steam heating element is used for guiding after reheating to the waste gas after cooling dehumidification and solvent recovery process the air inlet on the hot-blast business turn over layer of third.
further, the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the booster fan, and an air outlet of the booster fan is connected with a cold source inlet of the first heat exchanger;
A heat source inlet of the first heat exchanger contained in one set of the waste gas circulating system is connected with waste gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; a cold source outlet of the first heat exchanger is respectively connected with air inlets of the first steam heating assembly and the second steam heating assembly;
a heat source inlet of the first heat exchanger contained in the other set of waste gas circulating system is connected with the third hot air inlet and outlet layer and a waste gas discharge port of the cold air inlet and outlet layer; and a cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and an 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 the gas outlet of the solvent adsorption and desorption assembly is connected with the 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 circulating 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 a waste gas discharge assembly, and the inlet gas of the booster fan is provided with an air supplement assembly.
According to the characteristics of the exhaust gas discharged from CY311-CY314, the humidity of the exhaust gas of CY311 and CY312 is high, the humidity of the exhaust gas of CY313 and CY314 is high, and the concentration of the VOCs is relatively low, so that the CY311 and CY312, and the CY313 and CY314 are respectively set to be two units with the same process and are respectively treated.
DC desolventizer-toaster DC exhaust waste gas carries out the heat exchange through the pre-heater through the husky kelong purification back, with the waste gas after cooling dehumidification, promotes and gets into DC system gas temperature, and the steam consumption of saving system heating simultaneously tentatively reduces the temperature and the humidity of waste gas.
the waste gas through the preliminary heat transfer of first heat exchanger enters into second heat exchanger (second grade heat exchanger), and the second grade heat exchanger can set up to air-cooled heat exchanger or water-cooled heat exchanger according to user's particular case, further reduces the temperature of waste gas through the second grade heat exchange, condenses out the moisture in the waste gas. In areas with lower temperature in winter, when air-cooled heat exchange is adopted, the moisture content of the waste gas can be directly reduced to the index allowed by the system, and therefore the cost of subsequent chilled water heat exchange is saved.
The humidity of the waste gas after the secondary heat exchange is further reduced, if the humidity of the waste gas still does not meet the recycling requirement of the system, the temperature of the waste gas needs to be further reduced by utilizing the chilled water heat exchanger through the chilled water, so that the moisture in the waste gas is condensed, and the moisture content of the waste gas meets the recycling requirement of the system. The chilled water heat exchanger consists of a chilled water preparation device, a matched water cooling device and a heat exchange device.
The temperature of the waste gas after dehumidification by the chilled water heat exchanger is the lowest, and the moisture content meets the recycling requirement of the system. In order to increase the temperature of gas entering the system and save heating steam consumption, waste gas enters the DC evaporation device after being subjected to heat exchange with waste gas discharged from the system through the preheater.
The circulation of the waste gas can increase the VOC concentration (mainly using normal hexane as a solvent) in the gas, and if the VOC concentration is not reduced, the content of the solvent in the soybean meal product exceeds the standard due to the rise of the content of the solvent, so that the solvent recovery device is arranged to recover the solvent in the waste gas and reduce the concentration of the circulating waste gas, thereby ensuring that the quality of the soybean meal product is qualified. The invention adopts 10-20% of gas amount to recover the solvent by an adsorption and desorption mode, thereby avoiding the increase of investment and operation cost caused by total gas amount adsorption. The solvent recovery device adopts absorption materials such as hydrophobic molecular sieves and the like as adsorbents, steam is used for desorption, the desorbed steam and solvent enter the TK340 solvent recovery device of the leaching system which also uses the steam to recover the solvent, and the solvent is stably and completely recovered.
In order to guarantee the balance matching of the air quantity required by the system, the system provided by the application is provided with the air supplement port and the waste gas external exhaust port so as to deal with the change of the air quantity required by the system when the production of the system is changed. The air supplementing port is arranged at the inlet of the booster fan (FN 305A/B), the air inlet amount is controlled through an automatic air door, the air door is automatically opened when air is required to be supplemented, the opening degree and the closing time of the air door are automatically adjusted according to the air volume and resistance parameters of the system, and the air door is in a closed state during normal operation. The waste gas discharge port is arranged behind the solvent recovery device, when the air quantity required by the production system is reduced, the waste gas discharge port is opened to discharge a certain amount of waste gas to the outside of the system, so that the air quantity balance of the system is ensured, and meanwhile, the VOC concentration index of the discharged waste gas meets the requirement of the discharge standard. When the exhaust gas is required to be discharged, the outer air discharging door is 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.
In the system, each heat exchange device cools and dehumidifies the waste gas, condensed water is separated out, the condensed water separated out by the system is condensed water left in the bean pulp when the DT system steam is used for evaporating and removing the solvent, the condensed water separated out by the system contains a certain content of solvent, the condensed water is converged and then enters a TK340 solvent recovery device to recover the solvent in the condensed water, and the condensed water after exsolution enters a process system for recycling.
the system that this application provided is provided with monitoring sensing device such as system temperature, humidity, VOC concentration, resistance, flow to integrate with the autonomous control device of system, the autonomous control device of system simultaneously with waste gas, pollutant zero release and solvent recovery system and production system data coupling, the start-stop and the operation adjustment of each equipment in the common control system.
Example 2
referring to fig. 2, the system for zero emission of waste gas and pollutants in an desolventizer-toaster and solvent recovery provided by embodiment 2 of the present invention includes, as shown in fig. 2, a wet soybean meal drying and cooling mechanism, where the wet soybean meal drying and cooling mechanism includes 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 recirculation system; the waste gas circulating system is used for conducting cooling dehumidification and solvent recovery treatment on waste gas discharged from the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, then respectively guiding the waste gas into a third steam heating assembly connected with a third hot air inlet and outlet layer and guiding the waste gas to an air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the waste gas after cooling dehumidification and solvent recovery treatment and then guiding the waste gas to an air inlet of the third hot air inlet and outlet layer;
The first booster fan is used for guiding the third hot air inlet and outlet layer and the waste gas discharged from the cold air inlet and outlet layer into a first steam heating assembly and a second steam heating assembly 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, and the first steam heating assembly and the second steam heating assembly are used for reheating the waste gas and then guiding the waste gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer.
Further, the exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a second booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the second booster fan, and an air outlet of the second booster fan is connected with a 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 component and the second steam heating component; and the air outlets of the second booster fans are distributed on the third steam adding assembly and connected with the air inlets of the cold air inlet and outlet layer.
According to the DC operation exhaust emission condition of the DTDC steam-stripping machine and the characteristics that the humidity and the VOCs concentration of CY313 and CY314 exhaust gas are relatively low, when the moisture content of the CY313 and CY314 exhaust gas meets the recycling requirement of a DC system, the CY313 and CY314 exhaust gas is directly recycled to the DC upper layer for blowing off and is discharged through CY311 and CY312, then the CY311 and CY312 exhaust gas is subjected to dehumidification treatment to meet the blowing off recycling requirement of the DC lower layer, and meanwhile, the solvent in the CY311 and CY312 exhaust gas is recycled by 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 of the DC device of the desolventizer-toaster and solvent recovery.
after the waste gas CY313 and CY314 discharged from the steam-stripping machine DC is subjected to the sand-lock purification, the waste gas is subjected to heat exchange with the waste gas CY311 and CY312 through a preheater by a first booster fan (FN 305A) and then enters the steam-stripping machine DC, and is discharged through the waste gas CY311 and CY312, and then the waste gas enters a second heat exchanger (a secondary heat exchanger).
the waste gas through the preliminary heat transfer of first heat exchanger (pre-heater) enters into the second grade heat exchanger, and the second grade heat exchanger can set up to air cooled heat exchanger or water cooled heat exchanger according to user's particular case, further reduces the temperature of waste gas through the second grade heat transfer, condenses out the moisture in the waste gas. In areas with lower temperature in winter, when air-cooled heat exchange is adopted, the moisture content of the waste gas can be directly reduced to the index allowed by the system, and therefore the cost of subsequent chilled water heat exchange is saved.
The humidity of the waste gas after the secondary heat exchange is further reduced, if the humidity of the waste gas still does not meet the recycling requirement of the system, the temperature of the waste gas needs to be further reduced by utilizing the chilled water heat exchanger through the chilled water, so that the moisture in the waste gas is condensed, and the moisture content of the waste gas meets the recycling requirement of the system. The chilled water heat exchanger consists of a chilled water preparation device, a matched water cooling device and a heat exchange device.
the temperature of the waste gas after dehumidification by the chilled water heat exchanger is the lowest, and the moisture content meets the recycling requirement of the system. In order to increase the temperature of gas entering the system and save heating steam consumption, waste gas enters the DC evaporation device after being subjected to heat exchange with waste gas discharged from the system through the preheater.
The circulation of the waste gas can increase the VOC concentration (mainly using normal hexane as a solvent) in the gas, and if the VOC concentration is not reduced, the content of the solvent in the soybean meal product exceeds the standard due to the rise of the content of the solvent, so that the solvent recovery device is arranged to recover the solvent in the waste gas and reduce the concentration of the circulating waste gas, thereby ensuring that the quality of the soybean meal product is qualified. The invention adopts 10-20% of gas amount to recover the solvent by an adsorption and desorption mode, thereby avoiding the increase of investment and operation cost caused by total gas amount adsorption. The solvent recovery device adopts absorption materials such as hydrophobic molecular sieves and the like as adsorbents, steam is used for desorption, the desorbed steam and solvent enter the TK340 solvent recovery device of the leaching system which also uses the steam to recover the solvent, and the solvent is stably and completely recovered.
In order to guarantee the balance matching of the air quantity required by the system, the system provided by the application is provided with the air supplement port and the waste gas external exhaust port so as to deal with the change of the air quantity required by the system when the production of the system is changed. The air supplementing port is arranged at the inlet of the first booster fan/the second booster fan (FN 305A/B), the air inlet amount is controlled through an automatic air door, the air door is automatically opened when air is required to be supplemented, the opening degree and the closing time of the air door are automatically adjusted according to the air volume and resistance parameters of the system, and the air door is in a closed state during normal operation. The waste gas discharge port is arranged behind the solvent recovery device, when the air quantity required by the production system is reduced, the waste gas discharge port is opened to discharge a certain amount of waste gas to the outside of the system, so that the air quantity balance of the system is ensured, and meanwhile, the VOC concentration index of the discharged waste gas meets the requirement of the discharge standard. When the exhaust gas is required to be discharged, the outer air discharging door is 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.
In the system, each heat exchange device cools and dehumidifies the waste gas, condensed water is separated out, the condensed water separated out by the system is condensed water left in the bean pulp when the DT system steam is used for evaporating and removing the solvent, the condensed water separated out by the system contains a certain content of solvent, the condensed water is converged and then enters a TK340 solvent recovery device to recover the solvent in the condensed water, and the condensed water after exsolution enters a process system for recycling.
The system that this application provided is provided with monitoring sensing device such as system temperature, humidity, VOC concentration, resistance, flow to integrate with the autonomous control device of system, the autonomous control device of system simultaneously with waste gas, pollutant zero release and solvent recovery system and production system data coupling, the start-stop and the operation adjustment of each equipment in the common control system.
the application provides a desolventizer-toaster waste gas, pollutant zero release and solvent recovery system have following advantage: the system realizes the recycling of the waste gas of the DC system of the desolventizer-toaster and realizes zero emission of the waste gas; the system realizes the full recovery of the solvent, thereby reducing the operation cost of enterprises; zero emission of atmospheric pollutants such as system volatile organic compounds and the like is realized, and the problem of odor disturbing residents is thoroughly solved; the system adopts a wind network self-balancing system, and can realize the automatic compensation and exhaust of the system to maintain the balanced operation of the system.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A zero emission and solvent recovery system of waste gas and pollutants of a desolventizer-toaster, 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 circulating systems;
The waste gas circulation system is used for conducting cooling dehumidification and solvent recovery treatment on waste 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 waste gas to a first steam heating assembly and a second steam heating assembly which are connected with respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, wherein the first steam heating assembly and the second steam heating assembly are used for reheating the cooled dehumidified waste gas and the solvent recovered waste gas and then guiding the reheated waste gas to respective gas inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer;
Another set exhaust gas circulation system be used for with the hot-blast business turn over layer of third and cold wind business turn over layer exhaust waste gas cool off dehumidification and solvent recovery process after guide respectively to with in the third steam heating element that the hot-blast business turn over layer air inlet of third links to each other and guide extremely the air inlet on cold wind business turn over layer, third steam heating element is used for guiding after reheating to the waste gas after cooling dehumidification and solvent recovery process the air inlet on the hot-blast business turn over layer of third.
2. The exhaust gas of desolventizer-toaster, zero emission of pollutants and solvent recovery system of claim 1, wherein said exhaust gas circulation system comprises a first heat exchanger, a second heat exchanger and a booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the booster fan, and an air outlet of the booster fan is connected with a cold source inlet of the first heat exchanger;
a heat source inlet of the first heat exchanger contained in one set of the waste gas circulating system is connected with waste gas discharge ports of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer; a cold source outlet of the first heat exchanger is respectively connected with air inlets of the first steam heating assembly and the second steam heating assembly;
A heat source inlet of the first heat exchanger contained in the other set of waste gas circulating system is connected with the third hot air inlet and outlet layer and a waste gas discharge port of the cold air inlet and outlet layer; and a cold source outlet of the first heat exchanger is respectively connected with the third steam heating assembly and an air inlet of the cold air inlet and outlet layer.
3. The exhaust gas and pollutant zero emission and solvent recovery system of the desolventizer-toaster as claimed in claim 2, wherein a chilled water heat exchanger is connected between said second heat exchanger and said booster fan.
4. the exhaust gas and pollutant zero emission and solvent recovery system of the desolventizer-toaster as claimed in claim 2, wherein a solvent adsorption-desorption assembly is arranged between said booster fan and said first heat exchanger.
5. the exhaust gas and pollutant zero-emission and solvent recovery system of the desolventizer-toaster as claimed in claim 4, wherein an air outlet of the booster fan is respectively connected with an air inlet of the solvent adsorption-desorption assembly and a cold source inlet of the first heat exchanger through two pipelines; and the gas outlet of the solvent adsorption and desorption assembly is connected with the cold source inlet of the first heat exchanger.
6. The desolventizer-toaster exhaust gas, zero pollutant emission and solvent recovery system as claimed in claim 5, wherein said solvent adsorption-desorption assembly comprises an adsorbent for effecting adsorption and a steam desorption assembly for effecting desorption.
7. The exhaust gas and pollutant zero emission and solvent recovery system of the desolventizer-toaster as claimed in claim 5, wherein each of said two sets of exhaust gas circulating systems comprises said solvent adsorption and desorption components respectively connected to said solvent recovery component.
8. The exhaust gas, zero pollutant emission and solvent recovery system of the desolventizer-toaster as claimed in claim 7, wherein said solvent recovery module is connected with an exhaust gas discharge module, and an air supplement module is arranged at an inlet of said booster fan.
9. A zero emission and solvent recovery system of waste gas and pollutants of a desolventizer-toaster, 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 recirculation system; the waste gas circulating system is used for conducting cooling dehumidification and solvent recovery treatment on waste gas discharged from the first hot air inlet and outlet layer and the second hot air inlet and outlet layer, then respectively guiding the waste gas into a third steam heating assembly connected with a third hot air inlet and outlet layer and guiding the waste gas to an air inlet of the cold air inlet and outlet layer, and the third steam heating assembly is used for reheating the waste gas after cooling dehumidification and solvent recovery treatment and then guiding the waste gas to an air inlet of the third hot air inlet and outlet layer;
The first booster fan is used for guiding the third hot air inlet and outlet layer and the waste gas discharged from the cold air inlet and outlet layer into a first steam heating assembly and a second steam heating assembly 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, and the first steam heating assembly and the second steam heating assembly are used for reheating the waste gas and then guiding the waste gas to the respective air inlets of the first hot air inlet and outlet layer and the second hot air inlet and outlet layer.
10. The dt exhaust gas, zero pollutant emission and solvent recovery system of claim 9, wherein the exhaust gas recirculation system comprises a first heat exchanger, a second heat exchanger and a second booster fan; a heat source outlet of the first heat exchanger is connected with a heat source inlet of the second heat exchanger, a heat source outlet of the second heat exchanger is connected with an air inlet of the second booster fan, and an air outlet of the second booster fan is connected with a 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 component and the second steam heating component; and the air outlets of the second booster fans are distributed on the third steam adding assembly and connected with the air inlets of the cold air inlet and outlet layer.
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