CN112807722A - Continuous cascade thin film evaporator system - Google Patents
Continuous cascade thin film evaporator system Download PDFInfo
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- CN112807722A CN112807722A CN202110004934.2A CN202110004934A CN112807722A CN 112807722 A CN112807722 A CN 112807722A CN 202110004934 A CN202110004934 A CN 202110004934A CN 112807722 A CN112807722 A CN 112807722A
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- film evaporator
- thin film
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- outlet
- solvent
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- 239000010409 thin film Substances 0.000 title claims abstract description 75
- 239000002904 solvent Substances 0.000 claims abstract description 66
- 239000010408 film Substances 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000003860 storage Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
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Classifications
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- 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
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
Abstract
The invention discloses a continuous cascade thin film evaporator system which comprises a feeding preheater, a first thin film evaporator, a second thin film evaporator, a tail gas condenser, a material temporary storage tank, a condensate temporary storage tank and a vacuum pump. The continuous cascade thin film evaporator system can fully utilize heat and ensure the reduction of the energy consumption of the system; and a liquid seal is arranged between the two film evaporators, so that the pressure difference of the two film evaporators is ensured, the stability of a process system is ensured by using one vacuum pump, and the reduction of system investment is ensured; meanwhile, the stability and efficiency of the process are ensured by full-automatic operation. The continuous cascade thin film evaporator system improves the solvent recovery efficiency in pharmaceutical chemical industry and reduces the energy consumption and fixed investment of solvent recovery.
Description
Technical Field
The invention relates to the technical field of thin film evaporation, in particular to a continuous cascade thin film evaporator system.
Background
In recent years, with the gradual consumption of energy, the requirements of people on energy conservation and emission reduction of factories are increasing day by day. At present, the solvent recovery in the pharmaceutical chemical field mainly adopts the following devices: a distillation still, a thin film evaporator and a rectifying tower. Particularly, the existing research on a distillation still and a thin film evaporator mainly focuses on the optimization of monomer equipment, and the optimization design of the whole solvent recovery system is not provided, so that a large amount of energy is wasted by adopting the two solvent recovery modes, the two solvent recovery modes are mostly operated by manpower intermittently, the workload of personnel is high, and the probability of misoperation is high. Therefore, it is very urgent to provide a continuous and efficient automatic solvent recycling system in pharmaceutical chemical production. Therefore, the solvent recovery efficiency is improved, the labor intensity of workers is reduced, the energy consumption of solvent recovery is reduced, and the requirements of process production, energy conservation and emission reduction are met.
The traditional thin film evaporator mode is independent manual operation, each thin film evaporator is provided with a vacuum pump, a heat source is heated by steam, and the heat of secondary steam of heated solvent is directly condensed without utilization. Therefore, the design of the continuous cascade thin film evaporator system has the advantages that on one hand, heat among a plurality of evaporators can be utilized, the process energy consumption is reduced, on the other hand, the whole evaporation system is automatically controlled, the working load of workers is reduced, the stability and the high efficiency of the process system are ensured, the heat can be integrally recycled, and the problem which needs to be solved by the technicians in the field is solved urgently.
Disclosure of Invention
The invention provides a continuous cascade thin film evaporator system aiming at the problems of larger energy consumption and lower automation level caused by no repeated utilization of heat when a plurality of thin film evaporators are used simultaneously in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the continuous cascade thin film evaporator system is characterized by comprising a feeding preheater, a first thin film evaporator, a second thin film evaporator, a tail gas condenser, a material temporary storage tank, a condensate temporary storage tank and a vacuum pump;
a raw material liquid inlet of the first film evaporator is connected with the feed preheater through a feed pipeline, a bottom material liquid outlet is connected with the second film evaporator through a U-shaped bent feed pipeline, and a solvent secondary steam outlet is connected with a heating jacket of the second film evaporator through a first solvent secondary steam pipeline; an inlet of the heating jacket of the first thin film evaporator is connected with a steam pipeline, and a first regulating valve is arranged on the steam pipeline; the outlet of the heating jacket of the first film evaporator is connected with the feed preheater through a steam condensate pipeline; the first film evaporator is also provided with a liquid level sensor;
a feed liquid outlet of the second film evaporator is connected with the material temporary storage tank through a material pipeline, a solvent secondary steam outlet is connected with the tail gas condenser through a second solvent secondary steam pipeline, and a heating jacket gas outlet of the second film evaporator is connected with the tail gas condenser through a third solvent secondary steam pipeline;
a solvent outlet of the tail gas condenser is connected with the condensate temporary storage tank through a condensate pipeline, and a non-condensable gas outlet is connected with the vacuum pump pipeline;
a first pressure sensor and a first temperature sensor are arranged on the first solvent secondary steam pipeline; a second pressure sensor, a second temperature sensor and a second regulating valve are arranged on the second solvent secondary steam pipeline; and a third regulating valve is arranged on the third solvent secondary steam pipeline.
Further, the distance from the liquid surface in the first thin film evaporator to the bottom of the U-shaped bent feeding pipeline is H1The distance from the feed inlet of the second film evaporator to the bottom of the U-shaped bent feed pipeline is H2Said H is1And H2Satisfies the formula P1×H1＝P2×H2A liquid seal arrangement between the first and second thin film evaporators is achieved, wherein P is1The outlet pressure of the primary solvent steam generated by the first thin film evaporator; p2The outlet pressure of the secondary solvent vapor generated by the second thin film evaporator.
Further, the first regulating valve is connected with a first temperature sensor, and the temperature of the first thin film evaporator is controlled in an interlocking mode.
Further, the first regulating valve, the first temperature sensor and the second temperature sensor are connected in series, and the temperature cascade of the second thin film evaporator is controlled in a cascade linkage mode.
Further, the third regulating valve, the liquid level sensor and the first pressure sensor are sequentially connected to perform cascade interlocking control on the pressure of the first thin film evaporator.
Further, the second pressure sensor is connected with a second regulating valve, and the pressure of the second thin film evaporator is controlled in an interlocking mode.
Further, the second pressure sensor is also connected with a differential pressure calculation unit; and the differential pressure calculation unit is also connected between the liquid level sensor and the first pressure sensor.
Further, the top end of the material temporary storage tank is connected with the vacuum pump through a tail gas pipeline of the material temporary storage tank; the top end of the condensate temporary storage tank is connected with the vacuum pump through a tail gas pipeline of the condensate temporary storage tank.
Further, the exhaust gas of the vacuum pump is sent to an exhaust gas treatment system through an exhaust gas pipeline.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the continuous cascade thin film evaporator system can fully utilize heat and ensure the reduction of the energy consumption of the system; and a liquid seal is arranged between the two film evaporators, so that the pressure difference of the two film evaporators is ensured, the stability of a process system is ensured by using one vacuum pump, and the reduction of system investment is ensured; meanwhile, the stability and efficiency of the process are ensured by full-automatic operation.
The continuous cascade thin film evaporator system improves the solvent recovery efficiency in pharmaceutical chemical industry and reduces the energy consumption and fixed investment of solvent recovery.
Drawings
FIG. 1 is a schematic of a continuous cascade thin film evaporator system of the present invention;
wherein the reference numerals are:
1-feeding pipeline, 2-steam condensate pipeline, 3-steam pipeline, 4-feeding preheater, 5-first regulating valve, 6-first film evaporator, 7-liquid level sensor, 8-U-shaped bent feeding pipeline, 9-first pressure sensor, 10-first temperature sensor, 11-differential pressure calculation unit, 12-first solvent secondary steam pipeline, 13-second film evaporator, 14-second pressure sensor, 15-second temperature sensor, 16-second solvent secondary steam pipeline, 17-third solvent secondary steam pipeline, 18-material pipeline, 19-material temporary storage tank, 20-temporary storage material tank tail gas pipeline, 21-second regulating valve, 22-third regulating valve, 23-refrigerant return pipeline, 24-a refrigerant supply pipeline, 25-an exhaust gas condenser, 26-a condensate pipeline, 27-a condensate temporary storage tank, 28-a condensate temporary storage tank exhaust gas pipeline, 29-a vacuum pump and 30-an exhaust gas pipeline.
Detailed Description
The present invention will be further described with reference to the following detailed description and accompanying drawings, which are not intended to limit the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Examples
As shown in fig. 1, the present embodiment provides a continuous cascade thin film evaporator system comprising a feed preheater 4, a first thin film evaporator 6, a second thin film evaporator 13, a tail gas condenser 25, a material hold-in tank 19, a condensate hold-in tank 27 and a vacuum pump 29;
a raw material liquid inlet of the first film evaporator 6 is connected with a feed preheater 4 through a feed pipeline 1, a bottom material liquid outlet is connected with the second film evaporator 13 through a U-shaped bent feed pipeline 8, and a solvent secondary steam outlet is connected with a heating jacket of the second film evaporator 13 through a first solvent secondary steam pipeline 12; the inlet of the heating jacket of the first thin film evaporator 6 is connected with a steam pipeline 3, and a first regulating valve 5 is arranged on the steam pipeline 3; the outlet of the heating jacket of the first thin film evaporator 6 is connected with a feed preheater 4 through a steam condensate pipe 2; the first film evaporator 6 is also provided with a liquid level sensor 7;
a feed liquid outlet of the second film evaporator 13 is connected with a material temporary storage tank 19 through a material pipeline 18, a solvent secondary steam outlet is connected with a tail gas condenser 25 through a second solvent secondary steam pipeline 16, and a heating jacket gas outlet of the second film evaporator 13 is connected with the tail gas condenser 25 through a third solvent secondary steam pipeline 17;
a solvent outlet of the tail gas condenser 25 is connected with a condensate temporary storage tank 27 through a condensate pipeline 26, and a non-condensable gas outlet is connected with a vacuum pump 29 through a pipeline;
a first pressure sensor 9 and a first temperature sensor 10 are arranged on the first solvent secondary steam pipeline 12; a second pressure sensor 14, a second temperature sensor 15 and a second regulating valve 21 are arranged on the second solvent secondary steam pipeline 16; the third solvent secondary steam pipeline 17 is provided with a third regulating valve 22.
The top end of the material temporary storage tank 19 is connected with a vacuum pump 29 through a tail gas pipeline 20 of the material temporary storage tank; the top end of the condensate temporary storage tank 27 is connected with a vacuum pump 29 through a condensate temporary storage tank tail gas pipeline 28. The exhaust gas from the vacuum pump 29 is sent to an exhaust gas treatment system through an exhaust gas line 30.
In the continuous cascade thin film evaporator system of the present invention, the liquid surface in the first thin film evaporator 6 is at a distance H from the bottom of the U-shaped bent feed conduit 81The distance from the feed inlet of the second film evaporator 13 to the bottom of the U-shaped bent feed pipe 8 is H2，H1And H2Satisfies the formula P1×H1＝P2×H2A liquid-tight arrangement between the first thin-film evaporator 6 and the second thin-film evaporator 13 is achieved, wherein P is1The outlet pressure of the primary solvent vapor generated by the first thin film evaporator 6; p2Is the outlet pressure of the secondary solvent vapor generated by the second thin film evaporator 13. The liquid seal is arranged between the two film evaporators, so that the pressure difference of the two film evaporators is ensured, the process system is stable by using one vacuum pump 29, and the system investment is reduced.
In the continuous cascade thin film evaporator system of the present invention, the first regulating valve 5 is connected to the first temperature sensor 10, and the temperature of the first thin film evaporator 6 is controlled in an interlocking manner; the first regulating valve 5, the first temperature sensor 10 and the second temperature sensor 15 are connected in series, and the temperature of the second thin film evaporator 13 is controlled in cascade linkage.
The third regulating valve 22, the liquid level sensor 7 and the first pressure sensor 9 are sequentially connected to perform cascade interlocking control on the pressure of the first thin film evaporator 6; the second pressure sensor 14 is connected with the second regulating valve 21, and controls the pressure of the second thin film evaporator 13 in an interlocking manner; the second pressure sensor 14 is also connected to the differential pressure calculation unit 11; a differential pressure calculation unit 11 is also connected between the level sensor 7 and the first pressure sensor 9.
The continuous cascade thin film evaporator system can fully utilize heat, ensure the reduction of the energy consumption of the system, and ensure the stability and the efficiency of the process by full-automatic operation; the efficiency of solvent recovery in the pharmaceutical chemical industry is improved, and the energy consumption and fixed investment of solvent recovery are reduced.
The continuous cascade thin film evaporator system comprises the following specific working steps:
the raw material liquid enters the first film evaporator 6 after being preheated by the feeding preheater 4 through the feeding pipeline 1, meanwhile, fresh steam provides a heat source for the first film evaporator 6 from the steam pipeline 3, and the steam condensate after heat exchange preheats the raw material liquid in the feeding preheater 4 through the steam condensate pipeline 2.
The material entering the first film evaporator 6 for evaporation enters the second film evaporator 13 through the U-shaped bent feeding pipe 8, wherein the liquid seal between the two film evaporators is set as follows:
the distance from the liquid surface in the first thin film evaporator 6 to the bottom of the U-shaped bent feeding pipe 8 is H1The distance from the feed inlet of the second film evaporator 13 to the bottom of the U-shaped bent feed pipe 8 is H2，H1And H2Satisfies the formula P1×H1＝P2×H2；
P1The outlet pressure of the primary solvent vapor generated by the first thin film evaporator 6; p2Is the outlet pressure of the secondary solvent vapor generated by the second thin film evaporator 13.
The solvent secondary steam evaporated by the first film evaporator 6 enters the jacket of the second film evaporator 13 through a first solvent secondary steam pipeline 12 for heating; the solvent secondary steam after heat exchange enters the tail gas condenser 25 through a third solvent secondary steam pipeline 17 for condensation.
The solvent secondary steam evaporated by the second film evaporator 13 enters the tail gas condenser 25 through a second solvent secondary steam pipeline 16 for condensation; the material recovered from the solvent in the second film evaporator 13 enters a material temporary storage tank 19 through a material pipeline 18.
The solvent condensed by the tail gas condenser 25 enters the condensate temporary storage tank 27 through the condensate pipeline 26, the non-condensable gas in the solvent and the tail gas in the tail gas pipeline of the material temporary storage tank and the tail gas in the tail gas pipeline of the condensate temporary storage tank enter the vacuum pump 29, and the exhaust gas of the vacuum pump 29 is sent to the tail gas treatment system through the tail gas pipeline 30.
Application example
A pharmaceutical factory is mainly used for producing medicines, because raw materials contain solvent ethanol, in order to reduce the using amount of ethanol, the continuous cascade thin film evaporator system in the embodiment of the invention is adopted, and an energy repeated utilization and automatic control system is established. The following data were obtained:
number of vacuum pumps: 1, carrying out the following steps.
Steam consumption: 0.15-0.3 t (the amount of steam required for evaporating each ton of ethanol).
The temperature and pressure regulation in the operation process does not need manual intervention.
Comparative example
A pharmaceutical factory is mainly used for producing medicines, because raw materials contain solvent ethanol, in order to reduce the use amount of ethanol, two film evaporators are adopted to evaporate and recover the solvent, and the solvent is reused. The two film evaporators have different pressures under normal operating conditions. The traditional method is adopted, namely two independent film evaporation systems are operated manually, and secondary steam of evaporated solvent is directly condensed without being recycled. The following data were obtained:
number of vacuum pumps: and 2, carrying out the following steps.
Steam consumption: 0.35-0.65 t (the amount of steam required for evaporating each ton of ethanol).
Temperature pressure regulation during operation requires manual intervention.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A continuous cascade thin film evaporator system is characterized by comprising a feed preheater (4), a first thin film evaporator (6), a second thin film evaporator (13), a tail gas condenser (25), a material temporary storage tank (19), a condensate temporary storage tank (27) and a vacuum pump (29);
a raw material liquid inlet of the first film evaporator (6) is connected with the feed preheater (4) through a feed pipeline (1), a bottom material liquid outlet is connected with the second film evaporator (13) through a U-shaped bent feed pipeline (8), and a solvent secondary steam outlet is connected with a heating jacket of the second film evaporator (13) through a first solvent secondary steam pipeline (12); an inlet of a heating jacket of the first thin film evaporator (6) is connected with a steam pipeline (3), and a first regulating valve (5) is arranged on the steam pipeline (3); the outlet of the heating jacket of the first film evaporator (6) is connected with the feed preheater (4) through a steam condensate pipeline (2); a liquid level sensor (7) is also arranged on the first thin film evaporator (6);
a feed liquid outlet of the second film evaporator (13) is connected with the material temporary storage tank (19) through a material pipeline (18), a solvent secondary steam outlet is connected with the tail gas condenser (25) through a second solvent secondary steam pipeline (16), and a heating jacket gas outlet of the second film evaporator (13) is connected with the tail gas condenser (25) through a third solvent secondary steam pipeline (17);
a solvent outlet of the tail gas condenser (25) is connected with the condensate temporary storage tank (27) through a condensate pipeline (26), and a non-condensable gas outlet is connected with a vacuum pump (29) through a pipeline;
a first pressure sensor (9) and a first temperature sensor (10) are arranged on the first solvent secondary steam pipeline (12); a second pressure sensor (14), a second temperature sensor (15) and a second regulating valve (21) are arranged on the second solvent secondary steam pipeline (16); and a third regulating valve (22) is arranged on the third solvent secondary steam pipeline (17).
2. The continuous cascade thin film evaporator system of claim 1, wherein the liquid level in the first thin film evaporator (6) is at a distance H from the bottom of the U-bend feed conduit (8)1The distance from the feed inlet of the second film evaporator (13) to the bottom of the U-shaped bent feed pipeline (8) is H2Said H is1And H2Satisfies the formula P1×H1＝P2×H2A liquid seal arrangement between the first thin film evaporator (6) and the second thin film evaporator (13) is achieved, wherein P1Is the outlet pressure of the primary solvent vapor generated by the first thin film evaporator (6); p2Is the outlet pressure of the secondary solvent vapor generated by the second thin film evaporator (13).
3. A continuous cascade thin film evaporator system according to claim 1, characterised in that the first regulating valve (5) is connected to a first temperature sensor (10) for interlocking control of the temperature of the first thin film evaporator (6).
4. A continuous cascade thin film evaporator system according to claim 1, characterised in that the first regulating valve (5), first temperature sensor (10) and second temperature sensor (15) are connected in series, the temperature cascade of the second thin film evaporator (13) being controlled in cascade.
5. A continuous cascade thin film evaporator system according to claim 1, characterised in that the third regulating valve (22), the level sensor (7) and the first pressure sensor (9) are connected in series, the pressure cascade of the first thin film evaporator (6) being controlled in an interlocking manner.
6. A continuous cascade thin film evaporator system according to claim 1, characterised in that the second pressure sensor (14) is connected to a second regulating valve (21) for pressure-interlocked control of the second thin film evaporator (13).
7. The continuous cascade thin film evaporator system according to claim 1, characterized in that the second pressure sensor (14) is further connected to a differential pressure calculation unit (11); and the differential pressure calculating unit (11) is connected between the liquid level sensor (7) and the first pressure sensor (9).
8. The continuous cascade thin film evaporator system as claimed in claim 1, characterized in that the top end of the material buffer tank (19) is connected to the vacuum pump (29) via a material buffer tank tail gas line (20); the top end of the condensate temporary storage tank (27) is connected with the vacuum pump (29) through a condensate temporary storage tank tail gas pipeline (28).
9. The continuous cascade thin film evaporator system according to claim 1, characterized in that the exhaust of the vacuum pump (29) is sent to an exhaust gas treatment system through an exhaust gas conduit (30).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110004934.2A CN112807722A (en) | 2021-01-04 | 2021-01-04 | Continuous cascade thin film evaporator system |
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| CN202110004934.2A CN112807722A (en) | 2021-01-04 | 2021-01-04 | Continuous cascade thin film evaporator system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113476870A (en) * | 2021-06-21 | 2021-10-08 | 南京金典制冷实业有限公司 | Horizontal type conical falling film evaporator |
| WO2023103284A1 (en) * | 2021-12-07 | 2023-06-15 | 天华化工机械及自动化研究设计院有限公司 | Separation column for treating condensed water, and method therefor |
| WO2023103283A1 (en) * | 2021-12-07 | 2023-06-15 | 天华化工机械及自动化研究设计院有限公司 | System and method for improving water quality of dehydrating tower of purified terephthalic acid apparatus |
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| CN201704161U (en) * | 2010-05-14 | 2011-01-12 | 兰州节能环保工程有限责任公司 | Sewage evaporation treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113476870A (en) * | 2021-06-21 | 2021-10-08 | 南京金典制冷实业有限公司 | Horizontal type conical falling film evaporator |
| WO2023103284A1 (en) * | 2021-12-07 | 2023-06-15 | 天华化工机械及自动化研究设计院有限公司 | Separation column for treating condensed water, and method therefor |
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Application publication date: 20210518 |