CN106075947A - Methanol four tower double-effect heat pump energy-saving equipment and method - Google Patents
Methanol four tower double-effect heat pump energy-saving equipment and method Download PDFInfo
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- CN106075947A CN106075947A CN201610396525.0A CN201610396525A CN106075947A CN 106075947 A CN106075947 A CN 106075947A CN 201610396525 A CN201610396525 A CN 201610396525A CN 106075947 A CN106075947 A CN 106075947A
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- 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
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/146—Multiple effect distillation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to methanol four tower double-effect heat pump Finestill energy-saving Apparatus and method for.The methanol four tower double-effect heat pump Finestill energy-saving equipment of the present invention includes: pre-rectifying tower, pressurizing tower, atmospheric tower, methanol distillation column, reboiler, heat exchanger, condenser, compressor and choke valve；Wherein compressor, heat exchanger, condenser and choke valve constitute a VC type heat pump cycle；Compressor, reboiler and choke valve constitute a MVR type heat pump cycle；At an atmospheric tower feedboard intermediate reboiler arranged below；Atmospheric tower overhead vapours or cycle fluid are after compressor compresses, to atmospheric tower intermediate reboiler heat supply.Atmospheric tower tower top some vapor enters heat pump cycle.Pressurizing tower tower top methanol produced quantity reduces, and atmospheric tower tower top methanol produced quantity increases accordingly so that two tower energy are mated, thus the more existing four-column process flow of energy consumption of whole device can reduce by 20～40%.
Description
Technical field
The present invention relates to technical field of rectification, particularly to be methanol four tower double-effect heat pump energy-saving equipment and method.
Background technology
Methanol is a kind of very important industrial chemicals, is also a kind of rising clean energy resource.Due to first
The development of alcohol technology and the change of world energy sources structure, yield and the demand of methanol are increased by the world year by year.
Rectification is a kind of important and widely used separation method in modern industry, and it is directly connected to the matter of product
The problems such as amount, environmental conservation, energy consumption and production cost, and the energy consumption station of rectification working process is to the 50～60% of total energy consumption, so
Saving energy and reduce the cost in distillation process is increasingly subject to people's attention.
The existing methanol device of China is broadly divided into two towers, three towers and four tower distillation processes.Three tower double-effect rectifications utilize pressurization
Column overhead methanol steam constitutes double-effect rectification, both steam saving as the thermal source of atmospheric tower reboiler, saves again cooling water, and
Product quality improves, and gradually instead of two tower distillation processes.Three tower double-effect rectification flow processs followed by a methanol distillation column
Reclaim more methanol product and just constitute four tower double-effect rectification flow processs.In China, four tower double-effect rectification flow processs are by extensively
General application.Although methanol four tower double-effect rectification flow process has saved substantial amounts of energy, but, the reboiler of its flow process mesohigh tower
Huge with the condenser of atmospheric tower still energy consumption.
Summary of the invention
It is an object of the invention to make up above-mentioned deficiency of the prior art, reclaim used heat, reduce energy consumption, it is provided that Yi Zhongshe
Meter rationally, the methanol four tower double-effect heat pump rectification energy-saving new process that remains unchanged of production process and product quality.
Technical scheme is as follows:
A kind of methanol four tower double-effect heat pump Finestill energy-saving equipment, is characterized in that atmospheric tower tower bottom reboiler and pressurizing tower tower top
Methanol steam constitute double-effect rectification, at atmospheric tower feedboard intermediate reboiler arranged below, and with tower top steam after compression
Heat exchange constitutes heat pump circulating system.
Heat pump circulating system is VC type heat pump circulating system or MVR type heat pump circulating system.
Described VC type heat pump cycle is that a part of steam of atmospheric tower tower top is through heat exchange reboiler and cycle fluid heat exchange, warp
Cross the cycle fluid after heat exchange and enter compressor compresses, in atmospheric tower intermediate reboiler, then carry out heat exchange, following after heat exchange
Ring working medium, after choke valve blood pressure lowering, enters heat exchange reboiler and constitutes a heat pump cycle with atmospheric tower overhead vapours heat exchange.
Described MVR type heat pump cycle is after a part of steam of atmospheric tower tower top is directly over compressor compresses, at atmospheric tower
Carrying out heat exchange in intermediate reboiler, the steam after heat exchange is after choke valve blood pressure lowering, and a part is made as product extraction, a part
It is back to atmospheric tower tower top for backflow, thus completes a heat pump cycle.
Atmospheric tower tower top 30～the steam entrance circulating heat pump of 70%；Pressurizing tower tower top methanol produced quantity reduce by 30～
60%, atmospheric tower tower top methanol produced quantity increases by 20～50%.
Cycle fluid in VC type heat pump is dimethyl dichlorosilane (DMCS).
It is described as follows:
The methanol four tower double-effect heat pump Finestill energy-saving equipment of the present invention, it specifically includes that pre-rectifying tower, pressurizing tower, normal pressure
Tower, methanol distillation column, reboiler, heat exchanger, condenser, compressor and choke valve.By compressor, heat exchanger, condenser and joint
Stream valve constitutes a VC type heat pump cycle, the cycle fluid of this heat pump and tower top methanol steam heat exchange, and cycle fluid is after compression
To atmospheric tower intermediate reboiler heat supply；A MVR type heat pump cycle, atmospheric tower tower it is made up of compressor, reboiler and choke valve
Top steam is after compressor compresses, to atmospheric tower intermediate reboiler heat supply.
The method of the methanol four tower double-effect heat pump Finestill energy-saving of the present invention, atmospheric tower overhead vapours is divided into two parts, one
Dividing the condensed device of steam directly to condense, for VC type heat pump distillation, another part steam is through heat exchange reboiler and cycle fluid
Heat exchange, the cycle fluid after heat exchange enters compressor compresses, then carries out heat exchange, heat exchange in atmospheric tower intermediate reboiler
After cycle fluid after choke valve blood pressure lowering, enter heat exchange reboiler and atmospheric tower overhead vapours heat exchange one heat pump of composition and follow
Ring；For MVR type heat pump distillation, after another part steam is directly over compressor compresses, enter in atmospheric tower intermediate reboiler
Row heat exchange, the steam after heat exchange is after choke valve blood pressure lowering, and a part is back to as backflow as product extraction, a part
Atmospheric tower tower top, thus complete a heat pump cycle.In pressurizing tower tower top methanol produced quantity and usual methanol four tower double-effect rectification
The produced quantity of corresponding column reduces, and atmospheric tower tower top methanol produced quantity increases accordingly.
Atmospheric tower tower top 30～70% steam enter circulating heat pump, pressurizing tower tower top methanol produced quantity reduce by 30～
60%, atmospheric tower tower top methanol produced quantity increases by 20～50%.
Cycle fluid in VC type heat pump is dimethyl dichlorosilane (DMCS).
Pressurizing tower overhead vapours, to atmospheric tower tower bottom heating, constitutes a double-effect rectification process；Atmospheric tower overhead vapours portion
Divide and enter heat pump cycle, constitute a heat pump distillation process.
An atmospheric tower feedboard intermediate reboiler arranged below, by the steam heating after overcompression, it is achieved used heat returns
Receive, reduce the thermic load of tower bottom reboiler.
Regulation steam enters the amount of heat pump cycle, and the tower top methanol produced quantity of pressurizing tower and atmospheric tower, can make through
Steam after compressor compresses boils to reboiler, atmospheric tower intermediate reboiler and Methanol Recovery column overhead at the bottom of pre-rectifying tower more simultaneously
Device heat supply, thus realize Waste Heat Recovery greatly, reduce the energy consumption of whole flow process.
By above-mentioned workflow reengineering, atmospheric tower tower top some vapor enters heat pump cycle.Pressurizing tower tower top methanol produced quantity
Reducing, atmospheric tower tower top methanol produced quantity increases accordingly so that two tower energy are mated, and take full advantage of pressurizing tower and normal pressure
The waste heat of column overhead steam, reduces the thermic load of atmospheric tower tower bottom reboiler and overhead condenser, maintain product yield and
In the case of mass conservation so that the energy consumption of whole device relatively existing procedure can reduce by 20～40%.
The capital equipment of the methanol four tower double-effect heat pump new energy-saving process of the present invention and existing methanol four tower double-effect rectification
Equipment is identical, owing to the produced quantity of pressurizing tower and atmospheric tower changes, so the present invention is applicable to the design of new Methanol Plant.But
Just because of the introducing of these equipment with reconfigure, reduce the energy consumption of methanol four tower double-effect rectification process.
Accompanying drawing explanation
Fig. 1 is the VC type heat-pump rectifying process schematic flow sheet of the present invention:
Fig. 2 is the VC type heat pump distillation partial schematic diagram of the present invention:
Fig. 3 is the MVR type heat-pump rectifying process schematic flow sheet of the present invention:
Fig. 4 is the MVR type heat pump distillation partial schematic diagram of the present invention:
Wherein: 1 pre-rectifying tower, 2 pressurizing tower, 3 atmospheric towers, 4 methanol distillation columns, 5 reboilers, 6 condensations
Device, 7a, 7b, 7c heat exchange reboiler, 8 return tanks, 9 flash tanks, 10 compressors, 11 choke valves.
Detailed description of the invention
Equipment and method to the present invention are described further below in conjunction with the accompanying drawings.The present invention is mainly by methanol pre-rectifying tower
1, pressurizing tower 2, atmospheric tower 3, methanol distillation column 4, reboiler 5, condenser 6, heat exchange reboiler 7 (a, b, c), return tank 8, flash distillation
Tank 9, compressor 10 and choke valve 11, wherein at an atmospheric tower 3 feedboard intermediate heat transfer reboiler 7b arranged below, atmospheric tower
3 tower top some vapor enter heat pump cycle, and steam after compression carries out heat exchange in atmospheric tower intermediate heat transfer reboiler 7b.
Embodiment 1
Idiographic flow such as Fig. 1, uses such as the VC type heat pump of Fig. 2.
1. crude carbinol enter pre-rectifying tower 1 middle and upper part, pre-rectifying tower overhead vapours at first-stage condenser 6 partial condensation,
This condenser temperature controls at 60～80 DEG C.First-stage condenser on-condensible gas enters secondary condenser 6 and is cooled to 35～40 DEG C,
Secondary condenser fixed gas makees light component extraction, and lime set is back to pre-rectifying tower tower top through first-stage condenser return tank 8.At two grades
Condenser or first-stage condenser or add technique extraction water in two condenser reflux tanks, can be aperiodically from two grades simultaneously
Condenser reflux tank adopt exit extraction head fraction.The addition of technique extraction water is the 5～20% of crude carbinol inlet amount.Tower
Push up that total capacity of returns is crude carbinol inlet amount 50～70%.
2. pre-rectifying tower 1 materials at bottom of tower is directly entered pressurizing tower 2.Whole methanol steams of pressurization tower top send into atmospheric tower tower
End heat exchange reboiler 7a.Methanol condensed liquid partial reflux is to pressurizing tower tower top, and another part is as refined methanol product extraction.
3. pressurizing tower tower bottom liquid is directly entered atmospheric tower 3.The condensed device of atmospheric tower tower top some vapor 6 condenses, and residue is steamed
Vapour enters heat exchange reboiler 7c and carries out heat exchange with cycle fluid, and the steam after compressor 10 compresses of the cycle fluid after heat exchange exists
Atmospheric tower intermediate heat transfer reboiler 7b carries out heat exchange.Steam after heat exchange enters into heat exchange reboiler after choke valve 11 blood pressure lowering
Completing VC type heat pump cycle in 7c, the methanol condensed liquid after heat exchange reboiler 7c heat exchange mixes with the methanol solution of condenser 6 condensation
After conjunction, a part is back to atmospheric tower 3 tower top as backflow, and another part is as refined methanol product extraction.
4. atmospheric tower 3 side take-off liquid is directly entered methanol distillation column 4, with exhausted water extraction at the bottom of tower.Methanol distillation column 4 tower
After steam condensed device 6 condensation of top, a part of methanol lime set is back to methanol distillation column 4 tower top, another part as backflow
As refined methanol product extraction.With waste liquid extraction at the bottom of tower, side take-off Alcohols,fusel.
5. enter the amount of heat pump cycle according to atmospheric tower 3 overhead vapours, it is possible to achieve the part after compressor 10 compresses
Steam reboiler 5 with pre-rectifying tower 1 and methanol distillation column 4 in heat exchange reboiler 7c carries out heat exchange.
Embodiment 2
Idiographic flow such as Fig. 3, uses such as the MVR type heat pump of Fig. 4.
1. crude carbinol enter pre-rectifying tower 1 middle and upper part, pre-rectifying tower overhead vapours at first-stage condenser 6 partial condensation,
This condenser temperature controls at 60～80 DEG C.First-stage condenser on-condensible gas enters secondary condenser 6 and is cooled to 35～40 DEG C,
Secondary condenser fixed gas makees light component extraction, and lime set is back to pre-rectifying tower tower top through first-stage condenser return tank 8.At two grades
Condenser or first-stage condenser or add technique extraction water in two condenser reflux tanks, can be aperiodically from two grades simultaneously
Condenser reflux tank adopt exit extraction head fraction.The addition of technique extraction water is the 5～20% of crude carbinol inlet amount.Tower
Push up that total capacity of returns is crude carbinol inlet amount 50～70%.
2. pre-rectifying tower 1 materials at bottom of tower is directly entered pressurizing tower 2.Whole methanol steams of pressurization tower top send into atmospheric tower tower
End heat exchange reboiler 7a.Methanol condensed liquid partial reflux is to pressurizing tower tower top, and another part is as refined methanol product extraction.
3. pressurizing tower tower bottom liquid is directly entered atmospheric tower 3.The condensed device of atmospheric tower tower top some vapor 6 condenses, and residue is steamed
Vapour enters compressor 10, and steam after compression carries out heat exchange in atmospheric tower intermediate heat transfer reboiler 7b.Steam after heat exchange
MVR type heat pump cycle is completed, the methanol that the methanol condensed liquid after reducing pressure by regulating flow condenses with condenser 6 after choke valve 11 blood pressure lowering
After liquid mixing, a part is back to atmospheric tower 3 tower top as backflow, and another part is as refined methanol product extraction.
4. atmospheric tower 3 side take-off liquid is directly entered methanol distillation column 4, with exhausted water extraction at the bottom of tower.Methanol distillation column 4 tower
After steam condensed device 6 condensation of top, a part of methanol lime set is back to methanol distillation column 4 tower top, another part as backflow
As refined methanol product extraction.With waste liquid extraction at the bottom of tower, side take-off Alcohols,fusel.
5. enter the amount of heat pump cycle according to atmospheric tower 3 overhead vapours, it is possible to achieve the part after compressor 10 compresses
Steam reboiler 5 with pre-rectifying tower 1 and methanol distillation column 4 in heat exchange reboiler 7b carries out heat exchange.
The methanol four tower double-effect heat pump Finestill energy-saving Apparatus and method for that the present invention proposes, is carried out by preferred embodiment
Describing, person skilled substantially can be modified at equipment as herein described and operational approach or suitably change and combine,
Realize the technology of the present invention.Special needs to be pointed out is, all similar replacements and change are for a person skilled in the art
It is apparent from, is considered as being included in present invention spirit, scope and content.
Claims (6)
1. a methanol four tower double-effect heat pump Finestill energy-saving equipment, is characterized in that atmospheric tower tower bottom reboiler and pressurizing tower tower top first
Alcohol steam constitute double-effect rectification, at atmospheric tower feedboard intermediate heat transfer arranged below reboiler, and with tower top steaming after compression
Vapour heat exchange constitutes heat pump circulating system.
2. equipment as claimed in claim 1, is characterized in that heat pump circulating system is VC type heat pump circulating system or MVR type heat pump
Blood circulation.
3. the power-economizing method of a kind of methanol four tower double-effect heat pump Finestill energy-saving equipment of claim 1 or 2, is characterized in that VC type heat
Pump circulation is that a part of steam of atmospheric tower tower top is through heat exchange reboiler and cycle fluid heat exchange, the cycle fluid after heat exchange
Enter compressor compresses, then carry out heat exchange at atmospheric tower intermediate reboiler, the cycle fluid after heat exchange after choke valve blood pressure lowering,
Enter heat exchange reboiler and constitute a heat pump cycle with atmospheric tower overhead vapours heat exchange.
4. the power-economizing method of a kind of methanol four tower double-effect heat pump Finestill energy-saving equipment of claim 1 or 2, is characterized in that MVR type
Heat pump cycle is, after a part of steam of atmospheric tower tower top is directly over compressor compresses, to change in atmospheric tower intermediate reboiler
Heat, the steam after heat exchange is after choke valve blood pressure lowering, and a part is back to normal pressure as product extraction, a part as backflow
Column overhead, thus complete a heat pump cycle.
5. the method as described in claim 3 or 4, is characterized in that atmospheric tower tower top 30～the steam entrance circulating heat pump of 70%；
Pressurizing tower tower top methanol produced quantity reduces by 30～60%, and atmospheric tower tower top methanol produced quantity increases by 20～50%.
6. method as claimed in claim 3, is characterized in that the cycle fluid in VC type heat pump is dimethyl dichlorosilane (DMCS).
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| CN201610396525.0A CN106075947A (en) | 2016-06-03 | 2016-06-03 | Methanol four tower double-effect heat pump energy-saving equipment and method |
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| CN201610396525.0A CN106075947A (en) | 2016-06-03 | 2016-06-03 | Methanol four tower double-effect heat pump energy-saving equipment and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107032959A (en) * | 2017-05-16 | 2017-08-11 | 华陆工程科技有限责任公司 | A kind of heat pump and the methanol rectification method of multiple-effect coupling |
| CN107265539A (en) * | 2017-07-17 | 2017-10-20 | 常州大学 | A kind of processing method of high saliferous methanol waste water |
| CN108101748A (en) * | 2018-02-01 | 2018-06-01 | 天津市新天进科技开发有限公司 | Four tower triple effect methanol rectification energy-saving process methods and device |
| CN109665940A (en) * | 2019-01-07 | 2019-04-23 | 天津乐科节能科技有限公司 | Methanol is from backheat distillation system and application |
| CN110256202A (en) * | 2019-07-08 | 2019-09-20 | 张兵 | A kind of refining crude methanol process of four towers quadruple effect |
| CN111995499A (en) * | 2020-08-26 | 2020-11-27 | 吴嘉 | Methanol heat pump rectification method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107032959A (en) * | 2017-05-16 | 2017-08-11 | 华陆工程科技有限责任公司 | A kind of heat pump and the methanol rectification method of multiple-effect coupling |
| CN107265539A (en) * | 2017-07-17 | 2017-10-20 | 常州大学 | A kind of processing method of high saliferous methanol waste water |
| CN108101748A (en) * | 2018-02-01 | 2018-06-01 | 天津市新天进科技开发有限公司 | Four tower triple effect methanol rectification energy-saving process methods and device |
| CN108101748B (en) * | 2018-02-01 | 2024-05-07 | 天津市新天进科技开发有限公司 | Four-tower three-effect methanol rectification energy-saving process method and device |
| CN109665940A (en) * | 2019-01-07 | 2019-04-23 | 天津乐科节能科技有限公司 | Methanol is from backheat distillation system and application |
| CN110256202A (en) * | 2019-07-08 | 2019-09-20 | 张兵 | A kind of refining crude methanol process of four towers quadruple effect |
| CN110256202B (en) * | 2019-07-08 | 2024-04-19 | 张兵 | Four-tower four-effect crude methanol refining process method |
| CN111995499A (en) * | 2020-08-26 | 2020-11-27 | 吴嘉 | Methanol heat pump rectification method and device |
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