CN219185850U - Distillers' grains filtrate evaporating, concentrating and recycling system with zero steam consumption - Google Patents
Distillers' grains filtrate evaporating, concentrating and recycling system with zero steam consumption Download PDFInfo
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- CN219185850U CN219185850U CN202223438741.7U CN202223438741U CN219185850U CN 219185850 U CN219185850 U CN 219185850U CN 202223438741 U CN202223438741 U CN 202223438741U CN 219185850 U CN219185850 U CN 219185850U
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Abstract
The utility model discloses a zero-steam-consumption distillers' grain filtrate evaporation concentration recovery system, wherein feed liquid enters an MVR falling film evaporator through a preheater, an MVR concentrated solution outlet is connected with a one-effect back falling film evaporator, a one-effect back concentrated solution outlet is connected with a four-effect back falling film evaporator, a four-effect back concentrated solution outlet is connected with a four-effect front falling film evaporator, a four-effect front concentrated solution outlet is connected with a three-effect falling film evaporator, a three-effect concentrated solution outlet is connected with a two-effect falling film evaporator, a two-effect concentrated solution outlet is connected with a one-effect front forced evaporator, a one-effect front concentrated solution outlet is discharged, and the lower ends of the four-effect back concentrated solution evaporators are respectively matched with separators; the condensing water pipe of the tube bundle dryer is connected with the inlet of the primary flash evaporation tank, the primary flash evaporation is used as a heat source of the forced evaporator before the first effect, and the secondary flash evaporation is used as a heat source of the second effect falling film evaporator; the tail gas purified by the tube bundle dryer is used as a heat source of the one-effect back falling film evaporator and the four-effect back falling film evaporator. The system adopts MVR and flash evaporation to realize multi-effect combined use of waste heat, thereby realizing zero steam consumption.
Description
Technical Field
The utility model relates to a distillers 'grain filtrate recovery system, in particular to a distillers' grain filtrate evaporation concentration recovery system with zero steam consumption, and belongs to the technical field of waste liquid recycling.
Background
The alcohol industry is an important basic raw material industry of national economy, and alcohol is widely applied to various fields of foods, chemical industry, medicines and the like, and is also a wine base, a leaching agent, a solvent and an active agent. The raw materials for producing the alcohol in China mainly comprise starch raw materials such as corn, dried potato and the like.
Distillers' grains are one of the most serious pollution sources in the food and fermentation industries, and the comprehensive utilization rate of most alcohol enterprises is low due to investment, production scale, technology, management and other reasons. The pollution is most serious because of water pollution, and the waste water in the production process mainly comes from distilled grains discharged after the mature mash is distilled and fermented, washing water and flushing water of production equipment, cooling water of the steaming, saccharification, fermentation and distillation processes and the like. The waste liquor of alcohol is organic waste water with high concentration, high temperature and high suspended matters, and the waste liquor contains various crude fibers and polysaccharide substances, so that the treatment difficulty is increased.
The treatment technology of the waste mash of the alcohol is earlier and develops faster, and the most advanced treatment technology at present is the production of DDGS by an alcohol tank. The Chinese patent with publication number of CN 206119117U discloses a production system of DDGS feed, wherein the filter residue separated from waste mash of alcohol factory is vinasse, and the filtered clear liquid is evaporated and concentrated and then is sent into a tube bundle dryer together with the vinasse for drying, so that pollution can be thoroughly eliminated, the waste liquid treatment reaches the standard, and high-quality protein feed can be obtained. However, the DDGS production equipment has large investment, high energy consumption and high technical requirements, and only a part of domestic enterprises realize the DDGS production.
In the process of drying the vinasse, the exhaust gas generated by the tube bundle dryer contains the dried moisture, so that the temperature is high and a large amount of heat is generated. The Chinese patent with publication number of CN 209333222U discloses an energy-saving and environment-friendly DDGS waste heat evaporation system, which is used for washing the waste gas and then introducing the waste gas into an evaporator for heat recovery. Meanwhile, condensed water can be generated in the operation process of the tube bundle dryer, and secondary steam is flashed out by utilizing the high-temperature condensed water and is introduced into the evaporator, so that heat recovery is realized, and consumption of fresh steam is reduced.
The above prior art still has the following problems: the most advanced distillers' grains filtrate evaporating and concentrating technology of the existing DDGS utilizes the heat of high-temperature waste gas and condensed water flash evaporation of a tube bundle dryer, and also needs to supplement part of raw steam as heat input, so that zero steam consumption of the system cannot be realized, and the system has large occupied area, high investment and low discharge concentration and is uneconomical.
Disclosure of Invention
The utility model aims to overcome the problems in the prior art and provide a distillers' grains filtrate evaporation concentration recovery system with zero steam consumption, which adopts MVR, flash evaporation and multiple-effect combined use of waste heat, has high waste heat energy utilization rate and can realize zero steam consumption.
In order to solve the technical problems, the distillers' grain filtrate evaporation concentration recovery system with zero steam consumption comprises a feed liquid pipe, wherein an outlet of the feed liquid pipe is connected with a circulating pipe of an MVR falling film evaporator through a hot side of a preheater, a concentrated solution outlet of the MVR falling film evaporator is connected with a one-effect rear falling film evaporator, a concentrated solution outlet of the one-effect rear falling film evaporator is connected with a four-effect rear falling film evaporator, a concentrated solution outlet of the four-effect rear falling film evaporator is connected with a four-effect front falling film evaporator, a concentrated solution outlet of the four-effect front falling film evaporator is connected with a three-effect falling film evaporator, a concentrated solution outlet of the three-effect falling film evaporator is connected with a two-effect front forced evaporator, a concentrated solution outlet of the one-effect front forced evaporator is connected with a discharging pipeline, and separators are respectively matched with the lower ends of the falling film evaporators; the condensing water pipe of the tube bundle dryer is connected with the inlet of the primary flash tank, the top outlet of the primary flash tank is connected with the shell side inlet of the first-effect front forced evaporator, the bottom outlet of the primary flash tank and the shell side outlet of the first-effect front forced evaporator are both connected with the inlet of the secondary flash tank, and the outlet of the secondary flash tank is connected with the shell side inlet of the second-effect falling film evaporator; the purification tail gas pipe of the tube bundle dryer is connected with the shell side inlet of the one-effect back falling film evaporator, and the shell side outlet of the one-effect back falling film evaporator is connected with the shell side inlet of the four-effect back falling film evaporator through a draught fan.
As an improvement of the utility model, the separator exhaust port of the MVR falling film evaporator is connected with the inlet of the vapor compressor, and the outlet of the vapor compressor is connected with the shell side inlet of the MVR falling film evaporator.
As a further improvement of the utility model, the separator exhaust port of the one-effect back falling film evaporator is connected with the shell side inlet of the two-effect falling film evaporator, the separator exhaust port of the two-effect falling film evaporator is connected with the shell side inlet of the three-effect falling film evaporator, the separator exhaust port of the three-effect falling film evaporator is connected with the shell side inlet of the four-effect front falling film evaporator, and the separator exhaust ports of the four-effect front falling film evaporator and the four-effect back falling film evaporator are both connected with the air inlet of the surface air cooler.
As a further improvement of the utility model, the top outlet of the primary flash tank is also connected with the shell side inlet of the MVR falling film evaporator, the shell side outlet of the MVR falling film evaporator is connected with the inlet of the MVR condensate water tank, the bottom outlet of the MVR condensate water tank is connected with the cold side inlet of the preheater through the MVR condensate water pump, and the cold side outlet of the preheater is connected with the condensate water recycling tank.
As a further improvement of the utility model, the tube side outlet of the one-effect front forced evaporator is connected with the inlet of the one-effect front forced separator, the bottom outlet of the one-effect front forced separator is connected with the inlet of the one-effect front forced circulating tube, the middle section of the one-effect front forced circulating tube is provided with a forced circulating pump, and the outlet of the one-effect front forced circulating tube is connected with the tube side inlet of the one-effect front forced evaporator.
As a further improvement of the utility model, the top exhaust port of the one-effect pre-forced separator is also connected with the shell side inlet of the two-effect falling film evaporator, and the outlet of the secondary flash tank is connected with the boiler water supplementing pipe through a flash condensate pump.
As a further improvement of the utility model, shell side outlets of the one-effect rear falling film evaporator and the four-effect rear falling film evaporator are respectively connected with an inlet of a waste steam condensate tank, an outlet of the waste steam condensate tank is connected with an inlet of a waste steam condensate pump, and an outlet of the waste steam condensate pump is connected with a sewage treatment station.
As a further improvement of the utility model, the lower part of the surface cooler is provided with a condensed water collecting tank which is connected with the surface cooler into a whole, a shell side outlet of the surface cooler is connected with an inlet of the condensed water collecting tank, and a bottom outlet of the condensed water collecting tank is connected with a condensed water recycling tank through a multi-effect condensed water pump.
As a further improvement of the utility model, the shell side outlet of the two-effect falling film evaporator is connected with the inlet of the lower part of the shell side of the three-effect falling film evaporator through a trap, the shell side outlet of the three-effect falling film evaporator is connected with the inlet of the lower part of the shell side of the four-effect front falling film evaporator through a trap, and the shell side outlet of the four-effect front falling film evaporator is connected with the inlet of the condensed water collecting box.
Compared with the prior art, the utility model has the following beneficial effects: 1. based on the existing most advanced vinasse filtrate evaporation and concentration technology, an MVR and flash evaporation and waste heat multi-effect combined use system is provided, the vinasse filtrate with the concentration of 1.5-2.0% is increased to 4-5%, the steam energy consumption of a subsequent multi-effect evaporation system is reduced, and the economic efficiency is improved; and secondary steam generated by the tube bundle condensed water through the primary flash tank is used as a starting heat source of MVR, the MVR system is started without supplementing raw steam, and the treatment cost is reduced.
2. The split type falling film evaporator is changed into a falling film evaporator with an integrated heat exchanger and a separator, so that the occupied area is saved, the usage amount of a steel structure is reduced, and the investment is reduced; optimizing the last-effect surface cooler and the last-effect condensate water tank into a whole by a collecting water tank at the lower end of the surface cooler, so as to save the occupied area;
3. by adopting a falling film evaporation and forced circulation evaporation concentration system, the material enters a forced circulation evaporator after the concentration is increased to more than or equal to 25% by falling film evaporation concentration, the concentration of the material can be increased to more than or equal to 32%, the material liquid flows in full pipes, the flow speed is high, the evaporation efficiency is high, the possibility of scaling, pipe blocking and wall drying of the high-concentration material in the pipes is greatly reduced, the cleaning times are reduced, the production time is prolonged, the energy consumption of raw steam for subsequent pipe bundle drying is saved, and the method is economical and efficient;
4. the secondary steam evaporated by the flash evaporation of the tube bundle drying condensate is used as a heat source for MVR and multiple effects, the two-stage flash evaporation is designed to fully utilize the heat of the tube bundle condensate, the primary flash evaporation secondary steam is used for a one-effect front-effect forced circulation evaporator, the secondary flash evaporation secondary steam is used for a two-effect falling film evaporator, the pressure self-balancing is utilized, the waste heat of the tube bundle condensate is fully utilized, and the steam energy consumption is further reduced.
5. The waste heat of the tube bundle drying tail gas enters the one-effect back falling film evaporator for heat exchange by the induced draft fan after washing, and then enters the four-effect back falling film evaporator for heat exchange, and the two-stage waste heat evaporator is adopted, so that the waste heat of the tail gas is fully utilized, and the steam consumption is further reduced.
6. The system fully utilizes the heat of the tube bundle condensate flash steam and the heat in the tail gas of the tube bundle, so that the system steam is zero in consumption; the system combines MVR, condensate water flash evaporation, tube bundle tail gas, integrated falling film evaporation and forced circulation evaporation, and has the advantages of small occupied area, high concentration efficiency, less cleaning times, high discharge concentration and low energy consumption.
Drawings
The utility model will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the utility model.
FIG. 1 is a flow chart of a zero steam consumption distillers' grain filtrate evaporative concentration recovery system of the present utility model;
in the figure: MVR condensate tank; MVR falling film evaporator; 3. a primary flash tank; 4. a forced evaporator before the first effect; 5. a one-effect front forced separator; 6. a secondary flash tank; 7. a one-effect post-falling film evaporator; 8. a two-effect falling film evaporator; 9. a three-effect falling film evaporator; 10. a four-effect front falling film evaporator; 11. a four-effect back falling film evaporator; 12. a surface cooler; 12a, a condensed water collecting box; 13. a waste steam condensate tank; 14. a preheater; 15. a condensed water recycling tank; m1, a vapor compressor; m2, induced draft fan; p1.mvr condensate pump; a mvr falling film circulation pump; p3, a flash evaporation condensate pump; p4. forced circulation pump; p5. one-effect rear falling film circulating pump; p6. a two-effect falling film circulating pump; p7. a triple-effect falling film circulating pump; p8. four-effect front falling film circulating pump; p9. four-effect falling film circulating pump; p10. waste steam condensate pump; p11. multiple effect condensate pump; p12. vacuum pump; G1. a feed liquid pipe; G2. condensing water pipes of the tube bundle dryer; G3. purifying tail gas pipes by a tube bundle dryer; g4.mvr transfer tube; G5. a first-effect material transferring pipe; G6. four-effect rear material transferring pipe; G7. four-effect front material transferring pipe; G8. three-effect material transferring pipe; G9. a two-effect material transferring pipe; G10. a discharge pipe; G11. a boiler water supplementing pipe; G12. a cooling water inlet pipe; G13. and a cooling water return pipe.
Detailed Description
In the following description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not mean that the device must have a specific orientation.
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
As shown in fig. 1, the distillers' grain filtrate evaporation concentration recovery system with zero steam consumption comprises an MVR falling film evaporator 2, a primary flash tank 3, a first-effect front forced evaporator 4, a first-effect front forced separator 5, a secondary flash tank 6, a first-effect rear falling film evaporator 7, a second-effect falling film evaporator 8, a third-effect falling film evaporator 9, a fourth-effect front falling film evaporator 10 and a fourth-effect rear falling film evaporator 11, wherein the lower parts of the MVR falling film evaporator 2, the first-effect rear falling film evaporator 7, the second-effect falling film evaporator 8, the third-effect falling film evaporator 9, the fourth-effect front falling film evaporator 10 and the fourth-effect rear falling film evaporator 11 are respectively matched with separators.
The outlet of the feed liquid pipe G1 is connected with the hot side inlet of the preheater 14, the hot side outlet of the preheater 14 is connected with the MVR circulating pipe of the MVR falling film evaporator 2, the outlet of the bottom of the separator of the MVR falling film evaporator 2 is connected with the inlet of the MVR falling film circulating pump P2, and the outlet of the MVR falling film circulating pump P2 is connected with the top liquid inlet of the MVR falling film evaporator 2 through the MVR circulating pipe.
The separator exhaust port of the MVR falling film evaporator 2 is connected with the inlet of the vapor compressor M1, the outlet of the vapor compressor M1 is connected with the shell side inlet of the MVR falling film evaporator 2, and the vapor discharged by the separator of the MVR falling film evaporator 2 is compressed by the vapor compressor M1 and then returns to the shell side inlet of the MVR falling film evaporator 2 to be used as a heat source of the shell side of the MVR falling film evaporator 2 together with primary flash vapor discharged from the top of the primary flash tank 3.
MVR circulating liquid enters from the top of the MVR falling film evaporator 2, and in the process of flowing downwards along the inner wall of each falling film pipe, the circulating liquid is heated by compressed steam outside the falling film pipe and evaporated, and the circulating liquid is concentrated and falls into the separator below the MVR falling film evaporator 2.
The outlet of the MVR falling film circulating pump P2 is connected with the inlet of the one-effect rear falling film circulating pump P5 through an MVR transfer pipe G4, the inlet of the one-effect rear falling film circulating pump P5 is connected with the outlet of the bottom of the separator of the one-effect rear falling film evaporator 7, and the outlet of the one-effect rear falling film circulating pump P5 is connected with the top liquid inlet of the one-effect rear falling film evaporator 7.
The purification tail gas pipe G3 of the tube bundle dryer is connected with the shell side inlet of the one-effect back falling film evaporator 7, and the shell side outlet of the one-effect back falling film evaporator 7 is connected with the shell side inlet of the four-effect back falling film evaporator 11 through a draught fan M2.
The first-effect back circulating liquid is pumped out from the bottom of the separator of the first-effect back falling film evaporator 7 by the first-effect back falling film circulating pump P5, enters the top of the first-effect back falling film evaporator 7 together with MVR concentrated liquid sent by the MVR falling film circulating pump P2, and is evaporated by heat exchange with purified tail gas of the tube bundle dryer in the downward flowing process of the liquid distribution along the inner wall of each falling film tube, and the first-effect back concentrated liquid falls into the separator below the first-effect back falling film evaporator 7.
The outlet of the first-effect rear falling film circulating pump P5 is connected with the inlet of the fourth-effect rear falling film circulating pump P9 through a first-effect transfer pipe G5, and the first-effect transfer pipe G5 sends first-effect rear concentrated solution into the inlet of the fourth-effect rear falling film circulating pump P9. The inlet of the four-effect rear falling film circulating pump P9 is also connected with the outlet of the bottom of the separator of the four-effect rear falling film evaporator 11, and the outlet of the four-effect rear falling film circulating pump P9 is connected with the top liquid inlet of the four-effect rear falling film evaporator 11 through a four-effect rear circulating pipe. The four-effect rear circulating liquid is pumped out by the four-effect rear falling film circulating pump P9, is jointly sent to the top of the four-effect rear falling film evaporator 11 through the four-effect rear circulating pipe and the one-effect rear concentrated liquid, and is evaporated after heat exchange with the tail gas purified by the tube bundle dryer sent by the induced draft fan M2 in the process that the inner wall of each falling film pipe flows downwards after the four-effect rear liquid distribution is followed by the four-effect rear concentrated liquid, and the four-effect rear concentrated liquid falls into the separator below the four-effect rear falling film evaporator 11 for circulation.
The outlet of the four-effect rear falling film circulating pump P9 is connected with the inlet of the four-effect front falling film circulating pump P8 through a four-effect rear transfer pipe G6, and the four-effect rear transfer pipe G6 sends the four-effect rear concentrated solution into the inlet of the four-effect front falling film circulating pump P8. The inlet of the four-effect front falling film circulating pump P8 is also connected with the outlet of the separator of the four-effect front falling film evaporator 10, and the outlet of the four-effect front falling film circulating pump P8 is connected with the top liquid inlet of the four-effect front falling film evaporator 10 through a four-effect front circulating pipe. The four-effect front circulating liquid discharged from the separator outlet of the four-effect front falling film evaporator 10 is pumped out by the four-effect front falling film circulating pump P8, enters the top of the four-effect front falling film evaporator 10 together with the four-effect rear concentrated liquid through the four-effect rear circulating pipe, is heated by shell side steam and evaporated in the process of flowing downwards along the inner wall of each four-effect falling film pipe after liquid distribution, and falls into the separator below the four-effect front falling film evaporator 10 for circulation.
The outlet of the four-effect front falling film circulating pump P8 is connected with the inlet of the three-effect falling film circulating pump P7 through a four-effect front transfer pipe G7, and the four-effect front transfer pipe G7 sends the four-effect front concentrated solution into the inlet of the three-effect falling film circulating pump P7. The inlet of the three-effect falling film circulating pump P7 is also connected with the outlet of the separator of the three-effect falling film evaporator 9, and the outlet of the three-effect falling film circulating pump P7 is connected with the top liquid inlet of the three-effect falling film evaporator 9 through a three-effect circulating pipe. The three-effect circulating liquid discharged from the outlet of the separator of the three-effect falling film evaporator 9 is pumped out by the three-effect falling film circulating pump P7, enters the top of the three-effect falling film evaporator 9 together with the concentrated liquid before four effects through the three-effect circulating pipe, is heated by shell side steam and evaporated in the process of flowing downwards along the inner wall of each three-effect falling film pipe after liquid distribution, and falls into the separator below the three-effect falling film evaporator 9 for circulation.
The outlet of the three-effect falling film circulating pump P7 is also connected with the inlet of the two-effect falling film circulating pump P6 through a three-effect transfer pipe G8, and the three-effect transfer pipe G8 sends the three-effect concentrated solution into the inlet of the two-effect falling film circulating pump P6. The inlet of the second-effect falling film circulating pump P6 is also connected with the outlet of the separator of the second-effect falling film evaporator 8, and the outlet of the second-effect falling film circulating pump P6 is connected with the top liquid inlet of the second-effect falling film evaporator 8 through a second-effect circulating pipe. The second-effect circulating liquid discharged from the outlet of the separator of the second-effect falling film evaporator 8 is pumped out by the second-effect falling film circulating pump P6, enters the top of the second-effect falling film evaporator 8 together with the third-effect concentrated liquid through the second-effect circulating pipe, is heated by shell side steam and evaporated in the process of flowing downwards along the inner wall of the second-effect falling film pipe after liquid distribution, and falls into the separator below the second-effect falling film evaporator 8 for circulation.
The outlet of the tube side of the forced evaporator 4 before the effect is connected with the inlet of the forced separator 5 before the effect, the outlet of the bottom of the forced separator 5 before the effect is connected with the inlet of the forced circulation tube before the effect, the middle section of the forced circulation tube before the effect is provided with the forced circulation pump P4, and the outlet of the forced circulation tube before the effect is connected with the inlet of the tube side of the forced evaporator 4 before the effect. Under the action of the forced circulation pump P4, the feed liquid in the forced evaporator 4 flows through the full pipe before the effect, the flow speed is high, and the evaporation speed is high when the feed liquid enters the forced separator 5 before the effect.
The outlet of the second-effect falling film circulating pump P6 is also connected with the inlet of the forced circulating pump P4 through a second-effect transfer pipe G9, the second-effect transfer pipe G9 sends the second-effect concentrated solution into the inlet of the forced circulating pump P4, and the second-effect concentrated solution and the first-effect circulating solution enter the first-effect pre-forced evaporator 4 together for heating, enter the first-effect pre-forced separator 5 for evaporation, and output through the discharge pipeline G10 when the material concentration is more than or equal to 32%.
The condensing water pipe G2 of the tube bundle dryer is connected with the inlet of the primary flash tank 3, the top outlet of the primary flash tank 3 is connected with the shell side inlet of the first-effect front forced evaporator 4, the bottom outlet of the primary flash tank 3 and the shell side outlet of the first-effect front forced evaporator 4 are both connected with the inlet of the secondary flash tank 6, and the outlet of the secondary flash tank 6 is connected with the shell side inlet of the second-effect falling film evaporator 8;
the separator exhaust port of the first-effect back falling film evaporator 7 is connected with the shell side inlet of the second-effect falling film evaporator 8, the separator exhaust port of the second-effect falling film evaporator 8 is connected with the shell side inlet of the third-effect falling film evaporator 9, the separator exhaust port of the third-effect falling film evaporator 9 is connected with the shell side inlet of the fourth-effect front falling film evaporator 10, and the separator exhaust ports of the fourth-effect front falling film evaporator 10 and the fourth-effect back falling film evaporator 11 are connected with the air inlet of the surface air cooler 12.
The secondary steam discharged from the upper part of the separator of the two-effect falling film evaporator 8 enters the shell side of the three-effect falling film evaporator 9 to be used as a heat source, the secondary steam discharged from the upper part of the separator of the three-effect falling film evaporator 9 enters the shell side of the four-effect front falling film evaporator 10 to be used as a heat source, the secondary steam discharged from the upper parts of the separators of the four-effect front falling film evaporator 10 and the four-effect rear falling film evaporator 11 enters the shell side inlet of the surface air cooler 12 to be cooled by cooling circulating water, and the vacuum pump P12 pumps out and empties noncondensable gas of the shell side of the surface air cooler 12 and maintains the negative pressure of the system.
The top outlet of the primary flash tank 3 is also connected with the shell side inlet of the MVR falling film evaporator 2, the shell side outlet of the MVR falling film evaporator 2 is connected with the inlet of the MVR condensate water tank 1, the bottom outlet of the MVR condensate water tank 1 is connected with the cold side inlet of the preheater 14 through the MVR condensate water pump P1, and the cold side outlet of the preheater 14 is connected with the condensate water recycling tank 15. Condensed water on the shell side of the MVR falling film evaporator 2 enters the MVR condensed water tank 1 for temporary storage, the MVR condensed water pump P1 pumps out the condensed water in the MVR condensed water tank 1, the condensed water is sent to the hot side of the preheater 14, and after the feed is heated, the condensed water is discharged out of the system and enters the condensed water recycling tank 15 for recycling.
The top exhaust port of the forced separator 5 before the first effect is also connected with the shell side inlet of the second-effect falling film evaporator 8, and the outlet of the secondary flash tank 6 is connected with the boiler water supplementing pipe G11 through the flash condensate pump P3.
The condensed water of the tube bundle dryer enters a primary flash tank 3 for flash evaporation to form primary flash steam, the primary flash steam is used as a heat source of a shell side of a first-effect front forced evaporator 4, the primary flash condensed water discharged from the lower part of the shell side of the first-effect front forced evaporator 4 enters a secondary flash tank 6 for continuous flash evaporation, the secondary flash steam generated by the secondary flash tank 6, the secondary steam discharged from the top of the first-effect front forced separator 5 and the secondary steam discharged from the upper part of a separator of the first-effect rear falling film evaporator 7 are used as heat sources of the shell side of the second-effect falling film evaporator 8, and the condensed water discharged from the bottom of the secondary flash tank 6 is pumped out by a flash evaporation condensate pump P3 and is sent back to a boiler room through a boiler water supplementing pipe G11.
The tail gas purified by the tube bundle dryer enters the shell side of the one-effect falling film evaporator 7 to serve as a heat source, non-condensable gas is extracted by the induced draft fan M2 after heat exchange, and is sent into the shell side of the four-effect falling film evaporator 11 to serve as the heat source, and the heat is further exchanged and then emptied.
The shell side outlets of the first-effect back falling film evaporator 7 and the fourth-effect back falling film evaporator 11 are respectively connected with the inlet of the waste steam condensate tank 13, the outlet of the waste steam condensate tank 13 is connected with the inlet of the waste steam condensate pump, and the outlet of the waste steam condensate pump is connected with the sewage treatment station. The condensed water generated by shell side heat exchange of the one-effect back falling film evaporator 7 and the condensed water generated by shell side heat exchange of the four-effect back falling film evaporator 11 enter the waste steam condensate tank 13 together for collection, and are discharged by the waste steam condensate pump P10 and sent to a sewage treatment station due to high COD content.
The lower part of the surface cooler 12 is provided with a condensed water collecting tank 12a connected with the surface cooler 12 into a whole, the shell side outlet of the surface cooler 12 is connected with the inlet of the condensed water collecting tank 12a, and the bottom outlet of the condensed water collecting tank 12a is connected with a condensed water recycling tank 15 through a multi-effect condensed water pump. The cold side inlet of the surface cooler 12 is connected with a cooling water inlet pipe G12, and the cold side outlet is connected with a cooling water return pipe G13.
The shell side outlet of the two-effect falling film evaporator 8 is connected with the lower inlet of the shell side of the three-effect falling film evaporator 9 through a trap, the shell side outlet of the three-effect falling film evaporator 9 is connected with the lower inlet of the shell side of the four-effect front falling film evaporator 10 through a trap, and the shell side outlet of the four-effect front falling film evaporator 10 is connected with the inlet of the condensed water collecting box 12a.
The condensed water discharged from the shell pass of the second-effect falling film evaporator 8 is discharged into the shell pass of the third-effect falling film evaporator 9 through a trap, the condensed water discharged from the shell pass of the third-effect falling film evaporator 9 is discharged into the shell pass of the fourth-effect front falling film evaporator 10 through a trap, the condensed water discharged from the shell pass of the fourth-effect front falling film evaporator 10 is discharged into a condensed water collecting box 12a at the bottom of the surface cooler 12, the condensed water generated by the shell pass of the surface cooler 12 also enters a condensed water collecting box 12a at the bottom of the surface cooler to be collected, and the condensed water in the condensed water collecting box 12a enters a condensed water recycling tank 15 to be recycled through a multi-effect condensed water pump P11 discharging system.
The distillers' grains filtrate with the concentration of 1.5-2.0%wt is filtered by horizontal screws, enters the MVR condensed water on the cold side and the hot side of the preheater 14 through a feed liquid pipe G1, exchanges heat, and then rises to 70 ℃, enters the MVR falling film evaporator 2 for direct evaporation, the bottom feed liquid of the MVR falling film evaporator 2 is pumped out by an MVR falling film circulating pump P2 and returns to the top circulation of the MVR falling film evaporator 2 through a falling film evaporation circulating pipe, and when the concentration of the concentrated solution of the MVR falling film evaporator 2 rises to 4-5%wt, a discharge valve is automatically opened, and enters a multi-effect evaporation system through an MVR transfer pipe G4.
The concentrated solution of the first-effect rear falling film evaporator 7 enters the inlet of the fourth-effect rear falling film circulating pump P9 through the first-effect transfer pipe G5, the outlet concentrated solution of the fourth-effect rear falling film circulating pump P9 enters the fourth-effect front falling film circulating pipe through the fourth-effect rear transfer pipe G6, the outlet concentrated solution of the fourth-effect front falling film circulating pump P8 enters the third-effect falling film circulating pipe through the fourth-effect front transfer pipe G7, the outlet concentrated solution of the third-effect falling film circulating pump P7 enters the second-effect falling film circulating pipe through the third-effect transfer pipe G8, the outlet concentrated solution of the second-effect falling film circulating pump P6 enters the first-effect front forced circulating pipe through the second-effect transfer pipe G9, and the outlet concentrated solution of the forced circulating pump P4 is discharged out of the system through the discharging pipeline G10.
90.0t/h of raw material vinasse filtrate, 70 ℃ of feeding temperature, 25t/h of flow of condensed water of a tube bundle dryer and 130 ℃ of tube bundle condensed water; the temperature of dry balls/wet balls of purified tail gas washed by a washing tower of a tube bundle dryer is 90 ℃/80 ℃, the feeding concentration is 1.6%wt, the dry balls/wet balls enter an MVR evaporation system for evaporation concentration, the MVR evaporation temperature is 60 ℃, the temperature of materials preheated by a preheater 14 reaches 70 ℃, the materials enter an MVR falling film evaporator 2 for direct evaporation, the discharging is carried out after the discharging concentration reaches 5%, the materials enter a waste heat multi-effect falling film evaporation system for evaporation concentration, the discharging is carried out after the discharging concentration reaches 25%, the materials are sent to a flash evaporation forced circulation evaporator for evaporation concentration through an MVR transfer tube G4, the materials in the forced circulation evaporator reach 32% and are discharged outside the system for mixing with distilled grain or feed, and the materials are dried.
The foregoing description of the preferred embodiments of the present utility model illustrates and describes the basic principles, main features and advantages of the present utility model, and is not intended to limit the scope of the present utility model, as it should be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments. In addition to the embodiments described above, other embodiments of the utility model are possible without departing from the spirit and scope of the utility model. The utility model also has various changes and improvements, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the protection scope of the utility model. The scope of the utility model is defined by the appended claims and equivalents thereof. The technical features of the present utility model that are not described may be implemented by or using the prior art, and are not described herein.
Claims (9)
1. A zero steam consumption's lees filtrate evaporation concentration recovery system, includes feed liquid pipe, its characterized in that: the outlet of the feed liquid pipe is connected with a circulating pipe of the MVR falling film evaporator through the hot side of the preheater, the concentrated solution outlet of the MVR falling film evaporator is connected with a one-effect rear falling film evaporator, the concentrated solution outlet of the one-effect rear falling film evaporator is connected with a four-effect rear falling film evaporator, the concentrated solution outlet of the four-effect rear falling film evaporator is connected with a four-effect front falling film evaporator, the concentrated solution outlet of the four-effect front falling film evaporator is connected with a three-effect falling film evaporator, the concentrated solution outlet of the three-effect falling film evaporator is connected with a two-effect falling film evaporator, the concentrated solution outlet of the two-effect falling film evaporator is connected with a one-effect front forced evaporator, the concentrated solution outlet of the one-effect front forced evaporator is connected with a discharging pipeline, and the lower ends of the falling film evaporators are respectively matched with separators;
the condensing water pipe of the tube bundle dryer is connected with the inlet of the primary flash tank, the top outlet of the primary flash tank is connected with the shell side inlet of the first-effect front forced evaporator, the bottom outlet of the primary flash tank and the shell side outlet of the first-effect front forced evaporator are both connected with the inlet of the secondary flash tank, and the outlet of the secondary flash tank is connected with the shell side inlet of the second-effect falling film evaporator;
the purification tail gas pipe of the tube bundle dryer is connected with the shell side inlet of the one-effect back falling film evaporator, and the shell side outlet of the one-effect back falling film evaporator is connected with the shell side inlet of the four-effect back falling film evaporator through a draught fan.
2. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 1, wherein: and the exhaust port of the separator of the MVR falling film evaporator is connected with the inlet of the vapor compressor, and the outlet of the vapor compressor is connected with the shell side inlet of the MVR falling film evaporator.
3. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 1, wherein: the separator exhaust port of the first-effect back falling film evaporator is connected with the shell side inlet of the second-effect falling film evaporator, the separator exhaust port of the second-effect falling film evaporator is connected with the shell side inlet of the third-effect falling film evaporator, the separator exhaust port of the third-effect falling film evaporator is connected with the shell side inlet of the fourth-effect front falling film evaporator, and the separator exhaust ports of the fourth-effect front falling film evaporator and the fourth-effect back falling film evaporator are both connected with the air inlet of the surface air cooler.
4. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 2, wherein: the top outlet of the primary flash tank is also connected with the shell side inlet of the MVR falling film evaporator, the shell side outlet of the MVR falling film evaporator is connected with the inlet of the MVR condensate water tank, the bottom outlet of the MVR condensate water tank is connected with the cold side inlet of the preheater through the MVR condensate water pump, and the cold side outlet of the preheater is connected with the condensate water recycling tank.
5. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 1, wherein: the outlet of the tube side of the forced evaporator before the first effect is connected with the inlet of the forced separator before the first effect, the outlet of the bottom of the forced separator before the first effect is connected with the inlet of the forced circulation tube before the first effect, the middle section of the forced circulation tube before the first effect is provided with a forced circulation pump, and the outlet of the forced circulation tube before the first effect is connected with the inlet of the tube side of the forced evaporator before the first effect.
6. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 5, wherein: the top exhaust port of the forced separator before the first effect is also connected with the shell side inlet of the second effect falling film evaporator, and the outlet of the secondary flash tank is connected with a boiler water supplementing pipe through a flash condensate pump.
7. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 1, wherein: the shell side outlets of the one-effect rear falling film evaporator and the four-effect rear falling film evaporator are respectively connected with the inlet of the waste steam condensate tank, the outlet of the waste steam condensate tank is connected with the inlet of the waste steam condensate pump, and the outlet of the waste steam condensate pump is connected with the sewage treatment station.
8. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 3, wherein: the lower part of the surface cooler is provided with a condensed water collecting tank which is connected with the surface cooler into a whole, a shell side outlet of the surface cooler is connected with an inlet of the condensed water collecting tank, and a bottom outlet of the condensed water collecting tank is connected with a condensed water recycling tank through a multi-effect condensed water pump.
9. The zero vapor consumption distillers' grain filtrate evaporative concentration recovery system of claim 8, wherein: the shell side outlet of the two-effect falling film evaporator is connected with the lower inlet of the shell side of the three-effect falling film evaporator through a trap, the shell side outlet of the three-effect falling film evaporator is connected with the lower inlet of the shell side of the four-effect front falling film evaporator through a trap, and the shell side outlet of the four-effect front falling film evaporator is connected with the inlet of the condensate collecting box.
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| CN202223438741.7U CN219185850U (en) | 2022-12-21 | 2022-12-21 | Distillers' grains filtrate evaporating, concentrating and recycling system with zero steam consumption |
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| CN202223438741.7U CN219185850U (en) | 2022-12-21 | 2022-12-21 | Distillers' grains filtrate evaporating, concentrating and recycling system with zero steam consumption |
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