CN109432808B - Energy-saving and environment-friendly DDGS waste heat evaporation system - Google Patents
Energy-saving and environment-friendly DDGS waste heat evaporation system Download PDFInfo
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- CN109432808B CN109432808B CN201811599284.5A CN201811599284A CN109432808B CN 109432808 B CN109432808 B CN 109432808B CN 201811599284 A CN201811599284 A CN 201811599284A CN 109432808 B CN109432808 B CN 109432808B
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- 238000001704 evaporation Methods 0.000 title claims abstract description 52
- 230000008020 evaporation Effects 0.000 title claims abstract description 47
- 239000002918 waste heat Substances 0.000 title claims abstract description 41
- 101710089042 Demethyl-4-deoxygadusol synthase Proteins 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 140
- 238000005406 washing Methods 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000000706 filtrate Substances 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 42
- 230000000694 effects Effects 0.000 claims description 36
- 239000002912 waste gas Substances 0.000 claims description 29
- 238000000926 separation method Methods 0.000 claims description 13
- 239000000498 cooling water Substances 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 238000009834 vaporization Methods 0.000 claims 1
- 230000008016 vaporization Effects 0.000 claims 1
- 239000012141 concentrate Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009290 primary effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
- B01D3/065—Multiple-effect flash distillation (more than two traps)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to an energy-saving and environment-friendly DDGS waste heat evaporation system which comprises a condensate flash tank, a high-temperature condensate pump, an exhaust gas washing tower, a washing water pump, an effective heater, an effective separator, a two-effect heat exchanger, a two-effect separator, an evaporator, a surface condenser, a condensate water collecting tank and a condensate water pump, wherein the number of the three evaporators is three, the three-effect evaporator, the four-effect evaporator and the five-effect evaporator respectively.
Description
Technical Field
The invention relates to the technical field of vinasse protein feed production equipment, in particular to an energy-saving and environment-friendly DDGS waste heat evaporation system.
Background
In the alcohol production process, after the fermented mash evaporates out of alcohol, the distillers 'grains liquid rich in protein is left, the distillers' grains liquid is separated into two parts of filter residue and filtrate, wherein the filter residue is distillers 'grains, the distillers' grains can be used for producing whole distillers 'grains dried feed, namely DDGS after being dried by a tube bundle dryer, the filtrate is also sent to a dryer for drying after being evaporated and concentrated, and the dried product can be also used for producing whole distillers' dried feed.
At present, when a tube bundle dryer is used for drying vinasse, secondary steam generated by drying in the vinasse is called waste gas, the waste gas contains water obtained by drying the vinasse, part of vinasse dust and part of air, the temperature of the secondary steam is higher, a large amount of heat is contained, if the secondary steam is directly discharged, a large amount of heat loss and waste are caused, the energy waste is serious, the energy waste is not in line with the requirement of energy conservation and emission reduction, moreover, the vinasse dust in the secondary steam is easy to pollute the atmosphere, therefore, the secondary steam obtained by drying the vinasse is usually introduced into a multi-effect filtering liquid evaporation system in the prior art, the filtrate generated by solid-liquid separation of the vinasse is evaporated and concentrated, and the heat in the secondary steam is recovered, but the existing multi-effect filtering liquid evaporation system has low heat exchange efficiency, only has once heat exchange, the heat recovery rate in the secondary steam is low, and dust pollutants in the secondary steam are directly discharged after heat exchange, so that the requirements of energy conservation and emission reduction are not met.
Disclosure of Invention
In summary, in order to overcome the defects of the prior art, the invention provides an energy-saving and environment-friendly DDGS waste heat evaporation system, secondary steam generated by a tube bundle dryer is washed by a washing tower and then is sent to a multistage evaporation system, condensed water generated by the tube bundle dryer is processed by a flash tank and then is also sent to the multistage evaporation system, the washed secondary steam and the steam generated by the flash tank are utilized to carry out solid-liquid separation on vinasse liquid and then are subjected to evaporation concentration treatment to form filtrate, heat in the secondary steam and the condensed water generated by the tube bundle dryer is fully recovered, the waste heat recovery rate is high, dust pollutants in the secondary steam are absorbed, and the purposes of energy saving and emission reduction are achieved.
In order to solve the technical problems, the invention adopts the following technical scheme:
An energy-saving and environment-friendly DDGS waste heat evaporation system, wherein: the device comprises a condensate flash tank, a high-temperature condensate pump, an exhaust gas washing tower, a washing water pump, an effective heater, an effective separator, a two-effect heat exchanger, a two-effect separator, an evaporator, a surface condenser, a condensate water collecting tank and a condensate water pump, wherein the effective heater and the two-effect heat exchanger are all tubular heat exchangers, a heat exchange tube of the effective heater is communicated with an air inlet of the effective separator, a discharge outlet of the effective separator is communicated with a discharge outlet of the effective heater, a heat exchange tube of the two-effect heat exchanger is communicated with an air inlet of the two-effect separator, and a discharge outlet of the two-effect separator is communicated with a discharge outlet of the two-effect heat exchanger; the evaporator comprises a heat exchanger, a heater, an evaporation circulating pump and a separator, wherein the heat exchanger and the heater are tubular heat exchangers, a discharge port of the heat exchanger and a discharge port of the separator are communicated with a discharge port of the heater, a discharge port of the heater is communicated with a feed port of the heat exchanger and a feed port of the heater through the evaporation circulating pump, and a concentrated steam outlet of the heat exchanger is communicated with a concentrated steam outlet of the heater and an air inlet of the separator; the water inlet of the condensed water flash tank is communicated with the condensed water outlet of the tube bundle dryer and the condensed water outlet of the reboiler, the water outlet of the condensed water flash tank is communicated with the boiler through a high-temperature condensed water pump, the air outlet of the condensed water flash tank is communicated with the air inlet of the primary heater, and the air outlet of the primary separator is communicated with the air inlet of the heater of the evaporator; the air inlet of the waste gas washing tower is communicated with the waste gas exhaust port of the tube bundle dryer, the air outlet of the waste gas washing tower is communicated with the air inlet of the two-effect heat exchanger, the air outlet of the two-effect heat exchanger is communicated with the air inlet of the heat exchanger of the evaporator, the air outlet of the two-effect separator is communicated with the air inlet of the heater of the evaporator, and the air outlet of the heat exchanger of the evaporator is communicated with the atmosphere through an induced draft fan; the discharge port of the heater of the evaporator is communicated with the filtrate outlet of the vinasse liquid-solid-liquid separation device, the discharge port of the evaporation circulating pump of the evaporator is communicated with the discharge port of the second-effect heat exchanger through a pipeline, the discharge port of the second-effect heat exchanger is connected with the discharge port of the first-effect heater and the feed port of the second-effect heat exchanger through the second-effect circulating pump, and the discharge port of the first-effect heater is communicated with the feed port of the concentrated liquid storage tank and the feed port of the first-effect heater through the first-effect circulating pump; the condensation water outlet of the two-effect heat exchanger and the condensation water outlet of the heat exchanger of the evaporator are both communicated with the water inlet of the waste gas washing tower through pipelines, the water outlet of the waste gas washing tower is communicated with the washing water inlet and the condensate water drainage pipeline through a washing water pump, the condensate water drainage pipeline is communicated with a condensate water collecting tank, the condensate water collecting tank is communicated with a sewage treatment system through the condensate water pump, and the condensate water outlet of the one-effect heater and the condensate water outlet of the heater of the evaporator are communicated with the condensate water drainage pipeline.
The technical scheme of the invention can also be realized as follows: the number of the evaporators is three, the three-effect evaporators, the four-effect evaporators and the five-effect evaporators are respectively, the air inlet of the heater of the three-effect evaporators is communicated with the air outlet of the two-effect separator and the air outlet of the one-effect separator, the air inlet of the heat exchanger of the three-effect evaporators is communicated with the air outlet of the two-effect heat exchanger, the air outlet of the separator of the three-effect evaporators is communicated with the air inlet of the heater of the four-effect evaporators, the air outlet of the separator of the four-effect evaporators is communicated with the air inlet of the heater of the five-effect evaporators, the air outlet of the separator of the five-effect evaporators is communicated with the air inlet of the surface condenser, the air outlet of the heat exchanger of the three-effect evaporators is communicated with the air inlet of the heat exchanger of the four-effect evaporators, the air outlet of the heat exchanger of the four-effect evaporators is communicated with the atmosphere through a draught fan, the device is characterized in that a discharge port of a heater of the five-effect evaporator is communicated with a filtrate outlet of the vinasse liquid-solid-liquid separation device, the discharge port of the heater of the five-effect evaporator is communicated with a discharge port of a heater of the four-effect evaporator, a heat exchanger of the five-effect evaporator and a feed port of the heater through an evaporation circulating pump of the four-effect evaporator, the discharge port of the heater of the four-effect evaporator is communicated with the discharge port of the heater of the three-effect evaporator, the heat exchanger of the four-effect evaporator and the feed port of the heater, the discharge port of the heater of the three-effect evaporator is communicated with the discharge port of the two-effect heat exchanger, the heater of the three-effect evaporator and the feed port of the heat exchanger through an evaporation circulating pump, a condensate water outlet of the heater of the three-effect evaporator, a condensate water outlet of the heater of the four-effect evaporator, a condensate water outlet of the three-effect evaporator and a heat pump, the condensate water drainage ports of the heater of the five-effect evaporator are communicated with the condensate water drainage pipeline, and the drainage ports of the heat exchanger of the three-effect evaporator, the drainage ports of the heat exchanger of the four-effect evaporator and the drainage ports of the heat exchanger of the five-effect evaporator are communicated with the water inlet of the waste gas washing tower through pipelines.
The technical scheme of the invention can also be realized as follows: the device is characterized in that the emptying port of the first-effect heater, the emptying port of the heater of the third-effect evaporator, the emptying port of the heater of the fourth-effect evaporator and the emptying port of the heater of the fifth-effect evaporator are communicated with an emptying pipeline, the emptying pipeline is communicated with an air inlet of the surface condenser, the emptying port of the surface condenser is communicated with an emptying pump, a cooling water inlet of the surface condenser is communicated with a circulating cooling water source, a cooling water outlet of the surface condenser is communicated with a circulating cooling water source, a condensed water outlet of the surface condenser is communicated with a condensed water collecting tank, and the condensed water collecting tank is communicated with a sewage treatment system through a condensed water pump.
The technical scheme of the invention can also be realized as follows: the air inlet of the heater of the four-effect evaporator is communicated with the air outlet of the primary flash tank of the mash through a pipeline, the feed inlet of the primary flash tank of the mash is communicated with a distilled vinasse liquid source, the discharge outlet of the primary flash tank of the mash is communicated with the feed inlet of the secondary flash tank of the mash, the discharge outlet of the secondary flash tank of the mash is communicated with the solid-liquid separation device through a mash discharge pump, and the air outlet of the secondary flash tank of the mash is communicated with the air inlet of the heater of the five-effect evaporator.
The technical scheme of the invention can also be realized as follows: the device is characterized in that an effective control valve is arranged on a pipeline which is communicated with the concentrated solution storage tank, a two-effect control valve is arranged on a pipeline which is communicated with a discharge port of the first-effect heater, a three-effect control valve is arranged on a pipeline which is communicated with a discharge port of the second-effect heat exchanger, a four-effect control valve is arranged on a pipeline which is communicated with a discharge port of a heater of the four-effect evaporator, a five-effect control valve is arranged on a pipeline which is communicated with a discharge port of a heater of the five-effect evaporator, and a feed control valve is arranged on a pipeline which is communicated with a discharge port of a heater of the five-effect evaporator and a filtrate outlet of the vinasse liquid solid-liquid separation device.
The beneficial effects of the invention are as follows:
1. The invention washes the secondary steam generated in the drying process of the tube bundle dryer through the waste gas washing tower and then introduces the washed secondary steam into the secondary heat exchanger, the waste heat in the secondary steam is utilized to dry and concentrate the filtrate, the primary recycling of the waste heat of the secondary steam is realized, then the secondary steam enters the heat exchanger of the three-effect evaporator, the waste heat in the secondary steam is recycled again, and the like, the heat in the secondary steam is recycled by four stages through the secondary heat exchanger, the heat exchanger of the three-effect evaporator, the heat exchanger of the four-effect evaporator and the heat exchanger of the five-effect evaporator, the waste heat in the secondary steam generated by the tube bundle dryer is fully recycled, the heat is fully absorbed, and a small amount of tail gas discharged after washing through the waste gas washing tower and the four-stage waste heat absorption does not contain dust, thereby solving the problems of environmental pollution and the like caused by waste gas emission in the periphery of a production area.
2. The high-temperature steam condensate generated by the tube bundle dryer and the steam condensate in the reboiler are collected, the high-temperature pure flash steam is flashed under the negative pressure condition in the condensate flash tank, the flash steam is sent into the one-effect heater, the filtrate of the distilled liquor is evaporated and concentrated by utilizing the waste heat of the flash steam, the filtrate of the distilled liquor in the one-effect heater is evaporated and concentrated to generate steam, the steam is sent into the three-effect evaporator to be evaporated and concentrated by the heater of the three-effect evaporator, and the high-temperature condensate of the tube bundle dryer and the steam generated by the filtrate evaporation and concentration of the distilled liquor sequentially pass through the one-effect heater, the three-effect evaporator, the four-effect evaporator and the five-effect evaporator to be recycled by four stages, the waste heat of the high-temperature steam condensate generated by the tube bundle dryer and the steam condensate in the reboiler and the waste heat in the steam generated by the filtrate evaporation and concentration of the distilled liquor are fully recovered, the waste heat is utilized to evaporate and concentrate the filtrate of the distilled liquor, no extra energy is needed, and the energy utilization efficiency is effectively improved.
3. The invention is provided with a first-stage flash tank and a second-stage flash tank of the mash, and utilizes a flash evaporation process to perform primary flash evaporation and secondary flash evaporation on the high-temperature vinasse liquid, and the primary flash steam and the secondary flash steam are respectively led into a heater of a four-effect evaporator and a heater of a five-effect evaporator to recover heat in the high-temperature vinasse liquid.
4. The condensate water generated by the tube bundle dryer after the secondary steam is utilized is uniformly recycled into the waste gas washing tower, the water is used for spray washing of the secondary steam of the tube bundle dryer, and redundant washing water is sent into a condensate water discharge pipeline through a washing water pump after the liquid level in the waste gas washing tower is raised, and is discharged together with the condensate water in a heater and a surface condenser in a three-effect, four-effect and five-effect evaporator.
5. The invention has simple structure and convenient use, can fully recover heat in the alcohol production process, utilizes waste heat to evaporate and concentrate filtrate in the distilled liquid, fully and comprehensively recovers heat, and really realizes energy conservation and emission reduction.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the energy-saving and environment-friendly DDGS waste heat evaporation system comprises a condensate water flash tank 1, a high-temperature condensate water pump 2, an exhaust gas washing tower 4, a washing water pump 3, an effective heater 6, an effective separator 7, a two-effect heat exchanger 9, a two-effect separator 10, an evaporator, a surface condenser 24, a condensate water collecting tank 33 and a condensate water pump 25, wherein the effective heater 6 and the two-effect heat exchanger 9 are tube-type heat exchangers, a heat exchange tube of the effective heater 6 is communicated with an air inlet of the effective separator 7, a discharge outlet of the effective separator 7 is communicated with a discharge outlet of the effective heater 6, a heat exchange tube of the two-effect heat exchanger 9 is communicated with an air inlet of the two-effect separator 10, and a discharge outlet of the two-effect separator 10 is communicated with a discharge outlet of the two-effect heat exchanger 9; the evaporator comprises a heat exchanger, a heater, an evaporation circulating pump and a separator, wherein the heat exchanger and the heater are tubular heat exchangers, a discharge hole of the heat exchanger and a discharge hole of the separator are communicated with a discharge hole of the heater, a discharge hole of the heater is communicated with a feed hole of the heat exchanger and a feed hole of the heater through the evaporation circulating pump, and a concentrated steam outlet of the heat exchanger is communicated with a concentrated steam outlet of the heater and an air inlet of the separator.
The number of the evaporators is three, the evaporators are a three-effect evaporator 30, a four-effect evaporator 31 and a five-effect evaporator 32 respectively, the three-effect evaporator 30 comprises a three-effect heater 13, a three-effect heat exchanger 12, a three-effect separator 14 and a three-effect evaporation circulating pump 11, the four-effect evaporator 31 comprises a four-effect heater 18, a four-effect heat exchanger 17, a four-effect separator 19 and a four-effect evaporation circulating pump 16, and the five-effect evaporator 32 comprises a five-effect heater 22, a five-effect heat exchanger 21, a five-effect separator 23 and a five-effect evaporation circulating pump 20.
The water inlet of the condensed water flash tank 1 is communicated with the condensed water outlet of the tube bundle dryer and the condensed water outlet of the reboiler, the water outlet of the condensed water flash tank 1 is communicated with the boiler through a high-temperature condensed water pump 2, the air outlet of the condensed water flash tank 1 is communicated with the air inlet of the primary effect heater 6, and the air outlet of the primary effect separator 7 is communicated with the air inlet of the triple effect heater 13; the air outlet of the three-effect separator 14 is communicated with the air inlet of the four-effect heater 18, the air outlet of the four-effect separator 19 is communicated with the air inlet of the five-effect heater 22, and the air outlet of the five-effect separator 23 is communicated with the air inlet of the surface condenser 24. The air inlet of the four-effect heater 18 is communicated with the air outlet of the mash primary flash tank 27 through a pipeline, the feed inlet of the mash primary flash tank 27 is communicated with a distilled vinasse liquid source, the discharge outlet of the mash primary flash tank 27 is communicated with the feed inlet of the mash secondary flash tank 28, the discharge outlet of the mash secondary flash tank 28 is communicated with the solid-liquid separation device 44 through a mash discharge pump 29, and the air outlet of the mash secondary flash tank 28 is communicated with the air inlet of the five-effect heater 22.
The air inlet of the waste gas washing tower 4 is communicated with the waste gas exhaust port of the tube bundle dryer, the air outlet of the waste gas washing tower 4 is communicated with the air inlet of the second-effect heat exchanger 9, the air outlet of the second-effect heat exchanger 9 is communicated with the air inlet of the third-effect heat exchanger 12, the air outlet of the second-effect separator 10 is communicated with the air inlet of the third-effect heater 13, the air outlet of the third-effect heat exchanger 12 is communicated with the air inlet of the fourth-effect heat exchanger 17, the air outlet of the fourth-effect heat exchanger 17 is communicated with the air inlet of the fifth-effect heat exchanger 21, and the air outlet of the fifth-effect heat exchanger 21 is communicated with the atmosphere through an induced draft fan 15. The condensation water outlet of the two-effect heat exchanger 9, the condensation water outlet of the three-effect heat exchanger 12, the condensation water outlet of the four-effect heat exchanger 17 and the condensation water outlet of the five-effect heat exchanger 21 are all communicated with the water inlet of the waste gas washing tower 4 through pipelines, the water outlet of the waste gas washing tower 4 is communicated with the washing water inlet and the condensate water drainage pipeline 34 through the washing water pump 3, the condensate water outlet of the one-effect heater 6, the condensate water outlet of the three-effect heater 13, the condensate water outlet of the four-effect heater 18 and the condensate water outlet of the five-effect heater 22 are all communicated with the condensate water drainage pipeline 34, the condensate water drainage pipeline 34 is communicated with the condensate water collection tank 33, and the condensate water collection tank 33 is communicated with the sewage treatment system 37 through the condensate water pump 25.
The discharge port of the five-effect heater 22 is communicated with the filtrate outlet of the vinasse liquid-solid-liquid separation device 44, the discharge port of the five-effect heater 22 is communicated with the discharge port of the four-effect heater 18, the five-effect heat exchanger 21 and the feed port of the five-effect heater 22 through the five-effect evaporation circulating pump 20, the discharge port of the four-effect heater 18 is communicated with the discharge port of the three-effect heater 13, the feed port of the four-effect heat exchanger 17 and the feed port of the four-effect heater 18 through the four-effect evaporation circulating pump 16, the discharge port of the three-effect heater 13 is communicated with the discharge port of the two-effect heat exchanger 9, the three-effect heater 13 and the feed port of the three-effect heat exchanger 12 through the three-effect evaporation circulating pump 11, the discharge port of the two-effect heat exchanger 9 is communicated with the discharge port of the one-effect heater 6 and the feed port of the two-effect heat exchanger 9 through the two-effect circulating pump 8, and the discharge port of the one-effect heater 6 is communicated with the concentrate storage tank 35 and the feed port of the one-effect heater 6 through the one-effect circulating pump 5.
The emptying port of the first-effect heater 6, the emptying port of the third-effect heater 13, the emptying port of the fourth-effect heater 18 and the emptying port of the fifth-effect heater 22 are all communicated with an emptying pipeline 36, the emptying pipeline 36 is communicated with the air inlet of the surface condenser 24, the emptying port of the surface condenser 24 is communicated with an emptying pump 26, the cooling water inlet of the surface condenser 24 is communicated with a circulating cooling water source, the cooling water outlet of the surface condenser 24 is communicated with a circulating cooling water source, the condensed water outlet of the surface condenser 24 is communicated with a condensed water collecting tank 33, and the condensed water collecting tank 33 is communicated with a sewage treatment system 37 through a condensed water pump 25.
An effective control valve 38 is arranged on a pipeline of the first-effect circulating pump 5 communicated with the concentrated solution storage tank 35, a second-effect control valve 39 is arranged on a pipeline of the second-effect circulating pump 8 communicated with a discharge port of the first-effect heater 6, a third-effect control valve 40 is arranged on a pipeline of the third-effect evaporating circulating pump 11 communicated with a discharge port of the second-effect heat exchanger 9, a fourth-effect control valve 41 is arranged on a pipeline of the fourth-effect evaporating circulating pump 16 communicated with a discharge port of the third-effect heater 13, a fifth-effect control valve 42 is arranged on a pipeline of the fifth-effect evaporating circulating pump 20 communicated with a discharge port of the fourth-effect heater 18, and a feed control valve 43 is arranged on a pipeline of the fifth-effect heater 22 communicated with a filtrate outlet of the vinasse liquid-solid-liquid separation device 44.
When the waste heat recovery device is used, secondary steam generated by a tube bundle dryer enters the waste gas washing tower 4, the secondary steam after washing by the waste gas washing tower 4 enters the secondary heat exchanger 9, heat exchange is carried out between the secondary steam and filtrate of vinasse liquid in the secondary heat exchanger 9, filtrate is evaporated and concentrated, the secondary steam is cooled, part of waste heat in the secondary steam is absorbed and utilized, the secondary steam after being absorbed enters the three-effect heat exchanger 12 and is subjected to heat exchange with filtrate in the three-effect heat exchanger 12, the waste heat is absorbed and utilized again, the secondary steam then enters the four-effect heat exchanger 17 and is subjected to heat exchange with filtrate in the four-effect heat exchanger 17, the waste heat is absorbed and utilized again, the secondary steam then enters the five-effect heat exchanger 21 and is subjected to heat exchange with filtrate in the five-effect heat exchanger 21, the waste heat is absorbed and utilized again, the secondary steam after that is discharged to the atmosphere is discharged, the secondary steam generated by the tube bundle dryer is washed by the waste gas washing tower 4 and then fully utilized through the two-effect heat exchanger 9, the three-effect heat exchanger 12, the four-effect heat exchanger 17 and the five-effect heat exchanger 21 after four times of waste heat absorption, the waste heat in the five-effect heat exchanger 21 is discharged to the air, and the waste heat recovery device is fully realized, and the purpose of energy saving is achieved, and the waste heat recovery is achieved.
The high-temperature steam condensate water generated by the tube bundle dryer and the steam condensate water in the reboiler enter the condensate water flash tank 1, the high-temperature pure flash steam is flashed under the negative pressure condition in the condensate water flash tank 1, the flash steam is sent into the first-effect heater 6, the waste heat of the flash steam is utilized to evaporate and concentrate the filtrate of the vinasse liquid, part of the waste heat of the flash steam is absorbed and utilized, the filtrate of the vinasse liquid in the first-effect heater 6 is evaporated and concentrated to generate steam, the steam and the flash steam enter the three-effect heater 13 to evaporate and concentrate the filtrate of the vinasse liquid, and the steam generated by the high-temperature condensate water of the tube bundle dryer and the filtrate of the vinasse liquid sequentially passes through the first-effect heater 6, the three-effect heater 13, the four-effect heater 18 and the five-effect heater 22 and is recycled by four stages, the waste heat of the high-temperature steam condensate water generated by the tube bundle dryer and the waste heat of the steam condensate water in the reboiler and the waste heat generated by the filtrate of the vinasse liquid are fully recycled, the waste heat in the filtrate of the vinasse liquid is evaporated and concentrated, the waste heat of the vinasse liquid is not needed, the waste energy is utilized, and the energy utilization efficiency is effectively improved, and the efficiency of energy utilization is improved. The vapor generated by evaporating and concentrating the flash vapor and the waste heat which are recycled by the four stages and the filtrate enters the surface condenser 24 to be condensed into condensed water, and the condensed water enters the condensed water collection tank 33.
The fermented liquor is distilled out of alcohol and then leaves a protein-rich distilled liquor, the distilled liquor is high Wen Jiuzao liquid, the high Wen Jiuzao liquid enters a first-stage flash tank 27 of the fermented liquor for flash evaporation treatment, high-temperature primary flash steam is generated, the distilled liquor after the first-stage flash evaporation enters a second-stage flash tank 28 of the fermented liquor for flash evaporation treatment, secondary flash steam is generated, the primary flash steam enters a four-effect heater 18 for evaporation concentration of filtrate of the distilled liquor, and the secondary flash steam enters a five-effect heater 22 for evaporation concentration of filtrate of the distilled liquor, so that waste heat in the recovered high Wen Jiuzao liquid is recycled.
The feed control valve 43 is opened, the filtrate after the solid-liquid separation of the distillers' grains liquid firstly enters the five-effect heater 22, the filtrate enters the five-effect heater 22 and the five-effect heat exchanger 21 respectively from the feed inlet of the five-effect heater 22 and the feed inlet of the five-effect heat exchanger 21 under the action of the five-effect evaporation circulating pump 20, the filtrate exchanges heat with flash steam and the steam evaporated by the filtrate in the five-effect heater 22, the filtrate exchanges heat with secondary steam generated by the tube bundle dryer in the five-effect heat exchanger 21, the filtrate is evaporated and concentrated, after the filtrate is circularly evaporated and concentrated for a certain time under the action of the five-effect evaporation circulating pump 20, the five-effect control valve 42 is opened, the filtrate is sent into the four-effect heat exchanger 17 and the four-effect heater 18, the filtrate is evaporated and concentrated again, and the filtrate sequentially passes through the five-effect evaporator 32, the four-effect evaporator 31, the three-effect evaporator 30, the two-effect heat exchanger 9 and the one-effect heater 6, the filtrate is evaporated and concentrated for five times, and the filtrate after the circulation evaporation and concentration in the one-effect heater 6 enters the concentrated solution storage tank for storage. The purpose of evaporating and concentrating the filtrate is achieved.
The condensed water generated by the two-effect heat exchanger 9, the condensed water generated by the three-effect heat exchanger 12, the condensed water generated by the four-effect heat exchanger 17 and the condensed water generated by the five-effect heat exchanger 21 enter the waste gas washing tower 4 through pipelines, the washing water pump 3 is used for spraying and washing the secondary steam generated by the pipe bundle dryer, the excessive washing water is sent into a condensed water discharge pipeline through the washing water pump 3 after the liquid level in the waste gas washing tower 4 is raised, and the condensed water enters the condensed water collection tank 33 together with the condensed water of the one-effect heater 6, the condensed water of the three-effect heater 13, the condensed water of the four-effect heater 18, the condensed water of the five-effect heater 22 and the condensed water in the surface condenser 24, and then the sewage is sent into the sewage treatment system 37 for sewage treatment.
When the tube-in-tube heat exchanger exchanges heat, part of gas is not condensed, the gas exists in the tube-in-tube heat exchanger, steam is influenced, and the non-condensed gas must be discharged to ensure the heat exchange effect, so that the emptying port of the one-effect heater 6, the emptying port of the three-effect heater 13, the emptying port of the four-effect heater 18 and the emptying port of the five-effect heater 22 are all communicated with the emptying pipeline 36, the emptying pipeline 36 is communicated with the air inlet of the surface condenser 24, the emptying port of the surface condenser 24 is communicated with the emptying pump 26, and the non-condensed gas is discharged through the emptying pump 26.
It should be noted that the above-mentioned embodiments illustrate rather than limit the technical solution of the present invention, and that those skilled in the art may substitute equivalents or other modifications made according to the prior art, without departing from the spirit and scope of the technical solution of the present invention, and are included in the scope of the claims.
Claims (5)
1. An energy-concerving and environment-protective DDGS waste heat vaporization system, its characterized in that: comprises a condensed water flash tank (1), a high-temperature condensed water pump (2), an exhaust gas washing tower (4), a washing water pump (3), a first-effect heater (6), a first-effect separator (7), a second-effect heat exchanger (9), a second-effect separator (10), a third-effect evaporator (30), a surface condenser (24), a condensed water collecting tank (33) and a condensed water pump (25),
The heat exchange tubes of the first-effect heater (6) and the second-effect heat exchanger (9) are tube-type heat exchangers, the heat exchange tube of the first-effect heater (6) is communicated with the air inlet of the first-effect separator (7), the discharge port of the first-effect separator (7) is communicated with the discharge port of the first-effect heater (6), the heat exchange tube of the second-effect heat exchanger (9) is communicated with the air inlet of the second-effect separator (10), and the discharge port of the second-effect separator (10) is communicated with the discharge port of the second-effect heat exchanger (9);
The three-effect evaporator (30) comprises a three-effect heater (13), a three-effect heat exchanger (12), a three-effect separator (14) and a three-effect evaporation circulating pump (11), wherein the three-effect heat exchanger (12) and the three-effect heater (13) are tube-type heat exchangers, a discharge port of the three-effect heat exchanger (12) and a discharge port of the three-effect separator (14) are communicated with a discharge port of the three-effect heater (13), a discharge port of the three-effect heater (13) is communicated with a feed port of the three-effect heat exchanger (12) and a feed port of the three-effect heater (13) through the three-effect evaporation circulating pump (11), and a concentrated steam outlet of the three-effect heat exchanger (12) is communicated with a concentrated steam outlet of the three-effect heater (13) and an air inlet of the three-effect separator (14);
The water inlet of the condensed water flash tank (1) is communicated with the condensed water outlet of the tube bundle dryer and the condensed water outlet of the reboiler, the water outlet of the condensed water flash tank (1) is communicated with the boiler through a high-temperature condensed water pump (2), the air outlet of the condensed water flash tank (1) is communicated with the air inlet of the first-effect heater (6), and the air outlet of the first-effect separator (7) is communicated with the air inlet of the third-effect heater (13);
The air inlet of the waste gas washing tower (4) is communicated with the waste gas exhaust port of the tube bundle dryer, the air outlet of the waste gas washing tower (4) is communicated with the air inlet of the two-effect heat exchanger (9), the air outlet of the two-effect heat exchanger (9) is communicated with the air inlet of the three-effect heat exchanger (12), the air outlet of the two-effect separator (10) is communicated with the air inlet of the three-effect heater (13), and the air outlet of the three-effect heat exchanger (12) is communicated with the atmosphere through an induced draft fan (15);
The discharge port of the triple effect heater (13) is communicated with the filtrate outlet of the vinasse liquid-solid-liquid separation device (44), the discharge port of the triple effect evaporation circulating pump (11) is communicated with the discharge port of the double effect heat exchanger (9) through a pipeline, the discharge port of the double effect heat exchanger (9) is connected with the discharge port of the first effect heater (6) and the feed port of the double effect heat exchanger (9) through the double effect circulating pump (8), and the discharge port of the first effect heater (6) is communicated with the feed port of the concentrated liquid storage tank (35) and the feed port of the first effect heater (6) through the first effect circulating pump (5); the condensation outlet of two effect heat exchanger (9) and the condensation outlet of three effect heat exchanger (12) all communicate with the water inlet of waste gas washing tower (4) through the pipeline, the delivery port of waste gas washing tower (4) communicates washing water inlet and comdenstion water drainage pipe (34) through washing water pump (3), comdenstion water drainage pipe (34) communicate comdenstion water collection jar (33), comdenstion water collection jar (33) communicate sewage treatment system (37) through comdenstion water pump (25), the comdenstion water outlet of one effect heater (6), the comdenstion water outlet of three effect heater (13) communicate with comdenstion water drainage pipe (34).
2. The energy-saving and environment-friendly DDGS waste heat evaporation system according to claim 1, wherein: the evaporator also comprises a four-effect evaporator (31) and a five-effect evaporator (32), the four-effect evaporator (31) and the five-effect evaporator (32) have the same structure as the three-effect evaporator (30), the four-effect evaporator (31) comprises a four-effect heater (18), a four-effect heat exchanger (17), a four-effect separator (19) and a four-effect evaporation circulating pump (16), the five-effect evaporator (32) comprises a five-effect heater (22), a five-effect heat exchanger (21), a five-effect separator (23) and a five-effect evaporation circulating pump (20),
The air outlet of the triple effect separator (14) is communicated with the air inlet of the quadruple effect heater (18), the air outlet of the quadruple effect separator (19) is communicated with the air inlet of the five effect heater (22), the air outlet of the five effect separator (23) is communicated with the air inlet of the surface condenser (24), the air outlet of the triple effect heat exchanger (12) is communicated with the air inlet of the quadruple effect heat exchanger (17), the air outlet of the quadruple effect heat exchanger (17) is communicated with the air inlet of the five effect heat exchanger (21), the air outlet of the triple effect heat exchanger (21) is communicated with the atmosphere through the induced draft fan (15), the discharge port of the five effect heater (22) is communicated with the filtrate outlet of the vinasse liquid-solid-liquid separation device (44), the discharge port of the five effect heater (22) is communicated with the discharge port of the triple effect heater (18) and the feed port of the five effect heater (22) and the five effect heat exchanger (21), the discharge port of the triple effect heater (18) is communicated with the feed port of the triple effect heat exchanger (13) through the triple effect heat exchanger (13) and the triple effect heat exchanger (13) is communicated with the discharge port of the triple effect heater (13), the condensate water drainage port of the three-effect heater (13), the condensate water drainage port of the four-effect heater (18) and the condensate water drainage port of the five-effect heater (22) are all communicated with the condensate water drainage pipeline (34), and the drainage port of the three-effect heat exchanger (12), the drainage port of the four-effect heat exchanger (17) and the drainage port of the five-effect heat exchanger (21) are all communicated with the water inlet of the waste gas washing tower (4) through pipelines.
3. The energy-saving and environment-friendly DDGS waste heat evaporation system according to claim 2, wherein: the emptying port of the first-effect heater (6), the emptying port of the third-effect heater (13), the emptying port of the fourth-effect heater (18) and the emptying port of the fifth-effect heater (22) are all communicated with an emptying pipeline (36), the emptying pipeline (36) is communicated with the air inlet of the surface condenser (24), the emptying port of the surface condenser (24) is communicated with an emptying pump (26), the cooling water inlet of the surface condenser (24) is communicated with a circulating cooling water source, the cooling water outlet of the surface condenser (24) is communicated with the circulating cooling water source, the condensed water outlet of the surface condenser (24) is communicated with a condensed water collecting tank (33), and the condensed water collecting tank (33) is communicated with a sewage treatment system (37) through a condensed water pump (25).
4. The energy-saving and environment-friendly DDGS waste heat evaporation system according to claim 2, wherein: the air inlet of the four-effect heater (18) is communicated with the air outlet of the mash primary flash tank (27) through a pipeline, the feed inlet of the mash primary flash tank (27) is communicated with a distilled vinasse liquid source, the discharge outlet of the mash primary flash tank (27) is communicated with the feed inlet of the mash secondary flash tank (28), the discharge outlet of the mash secondary flash tank (28) is communicated with the solid-liquid separation device (44) through a mash discharge pump (29), and the air outlet of the mash secondary flash tank (28) is communicated with the air inlet of the five-effect heater (22).
5. The energy-saving and environment-friendly DDGS waste heat evaporation system according to claim 2, wherein: the utility model discloses a concentrated solution storage tank, a concentrated solution storage tank (35) and a five-effect heater (18) are provided with a concentrated solution circulating pump (5), a concentrated solution storage tank (35) and a concentrated solution circulating pump (16), a concentrated solution storage tank (35) and a concentrated solution circulating pump (20) are respectively arranged on the pipeline, a concentrated solution circulating pump (5) and a concentrated solution storage tank (35) are respectively provided with a concentrated solution circulating pump (38), a concentrated solution circulating pump (8) and a concentrated solution circulating pump (9) are respectively arranged on the pipeline, a concentrated solution circulating pump (11) and a concentrated solution circulating pump (13) are respectively arranged on the pipeline, a concentrated solution circulating pump (5) and a concentrated solution circulating pump (38) are respectively arranged on the pipeline, a concentrated solution circulating pump (8) and a concentrated solution circulating pump (40) are respectively arranged on the pipeline, a concentrated solution circulating pump (16) and a concentrated solution circulating pump (13) are respectively arranged on the pipeline, a concentrated solution circulating pump (20) and a concentrated solution circulating pump (44), a liquid pump (20) are respectively arranged on the pipeline.
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| CN111252832A (en) * | 2019-12-31 | 2020-06-09 | 宁夏佳立马铃薯产业有限公司 | Method and equipment for evaporating potato production wastewater |
| CN112657220A (en) * | 2020-12-25 | 2021-04-16 | 新疆冠农果茸股份有限公司 | Method for preparing fulvic acid dry powder from waste mash of alcohol |
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| CN112915563B (en) * | 2021-03-10 | 2022-08-12 | 郑州博大浓缩干燥设备有限公司 | Efficient energy-saving evaporation system for corn soaking liquid |
| CN114832573A (en) * | 2022-05-23 | 2022-08-02 | 江苏益元泰生物技术有限公司 | Intelligent control VOCs waste gas integrated treatment method for white spirit production workshop |
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