CN109134405A - A kind of waste heat recovery apparatus and technique using MVR technology - Google Patents
A kind of waste heat recovery apparatus and technique using MVR technology Download PDFInfo
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- CN109134405A CN109134405A CN201810841461.XA CN201810841461A CN109134405A CN 109134405 A CN109134405 A CN 109134405A CN 201810841461 A CN201810841461 A CN 201810841461A CN 109134405 A CN109134405 A CN 109134405A
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- water
- epoxychloropropane
- waste heat
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/08—Compounds containing oxirane rings with hydrocarbon radicals, substituted by halogen atoms, nitro radicals or nitroso radicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a kind of equipment using MVR technology recovery waste heat comprising sequentially connected Falling film heat transfer device, falling film separator, second separator, Falling film heat transfer device are connected with neutral section, and second separator is connected with compressor and hydrops device.The equipment utilization mechanical vapor recompression technology carries out waste heat recycling, and energy consumption is greatly reduced, the 1/6-1/5 of only traditional rectification process energy consumption, the thermal efficiency is high, and reduces the dependence to conventional boiler equipment, also reduces pollutant, no pollution to the environment, energy conservation and environmental protection.Also disclose the technique using the equipment recovery waste heat, this technique substantially reduces the energy consumption of traditional distillation system by recycling tower top waste hot steam waste heat, makees simple, process is controllable, stable product quality and excellent, it is with good economic efficiency, and the automation technolo degree is high, it can operate continuously, high production efficiency meets sustainable development requirement, can be widely applied to during actual industrial production.
Description
Technical field
The invention belongs to heat recovery technical fields, are related to a kind of equipment and work using MVR technology recovery waste heat
Skill relates in particular to a kind of equipment and technique using MVR system recycling epoxychloropropane and water mixed vapour waste heat.
Background technique
Epoxychloropropane is a kind of important industrial chemicals, can be used for producing epoxy resin, it can also be used to produce synthetic glycerine,
Chlorohydrin rubber and fire retardant etc..Epoxychloropropane can be made by propylene oxide oxidizing process, using propylene oxide as raw material,
Under the catalysis of three lithium of orthophosphoric acid, it is selectively isomerizated into propenyl, propenyl and chlorine synthesizing dichloropropanol, dichlorohydrin and quilt
Calcium hydroxide is saponified into epoxychloropropane, and rectifying obtains finished product.
Rectifying is that a kind of boiling point using two kinds of substances is different, using energy as process driving force, carries out mixing steaming in multiple times
The evaporation of the part of the partial condensation of vapour and mixing liquid, thus the method for separating two kinds of substances, it only need to provide energy and
Coolant can obtain the product of high-purity, and maturation easy to operate is the effective means for separating a variety of organic mixtures.General essence
Operation is evaporated, part refluxing portion discharge system after tower top design condenser is condensed overhead vapours not only needs cold in this way
But water is also wasted as cold source, the heat of overhead vapours.Since overhead vapours temperature and pressure is lower, cannot generally remake
It is continued to use for heat source.This makes the energy consumption of entire distillation system huge.Therefore, how to be dropped during preparing epoxychloropropane
The energy consumption of low distillation system is a urgent problem to be solved.
MVR (Mechanical Vapor Recompression, mechanical steam recompression) vapo(u)rization system uses low temperature
Steam is generated with low-pressure steam steaming technique and clean energy resource (i.e. electric energy), the moisture in medium is separated, with its section outstanding
Energy characteristic is widely used in the industries such as chemical industry, pharmacy, food, beverage, environmental protection, but there is no be used for MVR vapo(u)rization system at present
Recovery waste heat, the application for reducing energy consumption.
Summary of the invention
For this purpose, the present invention exactly will solve above-mentioned technical problem, to propose a kind of setting using MVR technology recovery waste heat
Standby and technique.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of equipment using MVR technology recovery waste heat comprising sequentially connected Falling film heat transfer device, drop
Membrane separator, second separator, the Falling film heat transfer device are connected with neutral section, the second separator be connected with compressor and
Hydrops device.
Preferably, the Falling film heat transfer device is also connected with a vacuum pump, the Falling film heat transfer device is connected with falling liquid film circulation
Pump, the neutral section are connected with recovered water pump and discharging pump.
Preferably, the hydrops device is connected with hydrops pump.
The present invention also provides a kind of techniques for carrying out waste heat recycling using the equipment comprising following steps:
S1, it the mixed vapour of epoxychloropropane and water after rectifying is entered in Falling film heat transfer device as heat source exchanges heat, institute
State the mixing liquid that mixed vapour is condensed into epoxychloropropane and water；
S2, separation epoxychloropropane and water, the mixing liquid that step S1 is obtained are separated by neutral section, are respectively obtained
Epoxychloropropane product and water；
S3, the obtained water of step S2 is recycled to the Falling film heat transfer device, is changed with the mixed vapour of epoxychloropropane and water
Heat is changed into water vapour；
S4, the water vapour for obtaining step S3 are sent into compressor, improve the temperature and pressure of water vapour.
Preferably, the step S4 specifically: further divide the water vapour that step S3 is obtained by second separator
After gas phase and liquid phase, water vapour is sent into compressor, the temperature and pressure of water vapour is improved by compressor work, through step
After S4 processing, 90 DEG C of the temperature of steam, pressure 70KPa.
Preferably, the mixed vapour temperature of epoxychloropropane described in the step S1 and water is 75 DEG C, pressure is
46KPa。
Preferably, the Falling film heat transfer device is shell-and-tube heat exchanger, the mixed vapour of the epoxychloropropane and water exists
Heat source is used as in shell side, water flow in tube side is used as heat transferring medium, and the temperature of water is 70 DEG C, pressure 31KPa.
Preferably, the water vapour that the temperature and pressure that the step S4 is obtained improves is used as and produces epoxy chlorine for distilling
The heating steam of propane.
Preferably, the step S2 specifically: the mixture of liquid phase epoxidation chloropropane and water is passed through neutral section, liquid
Phase epoxychloropropane is not soluble in water and density is greater than water, and epoxychloropropane is sunken to neutral section bottom, and water swims in epoxy chloropropionate
At the top of alkane, by partition by water overflow to the neutral section other side, i.e., epoxychloropropane and water are separated.
The above technical solution of the present invention has the following advantages over the prior art:
(1) equipment of the present invention using MVR technology recovery waste heat comprising sequentially connected Falling film heat transfer device,
Falling film separator, second separator, the Falling film heat transfer device are connected with neutral section, and the second separator is connected with compressor
With hydrops device.The equipment utilization mechanical vapor recompression technology carries out waste heat recycling, and energy consumption is greatly reduced, only
The 1/6-1/5 of traditional rectification process energy consumption, the thermal efficiency is high, and reduces the dependence to conventional boiler equipment, also reduces pollution
Object, no pollution to the environment, energy conservation and environmental protection.
(2) technique of the present invention using the equipment recovery waste heat, including recovery tower top epoxychloropropane and water
Waste heat, epoxychloropropane and the water separation of mixed vapour, water recycling, MVR technology improve water vapour heat content as new heat source
The step of, the waste heat of script is recycled.This technique substantially reduces traditional essence by recycling tower top waste hot steam waste heat
The energy consumption of system is evaporated, obtains the rectifying operating system for having more market value, technological operation is simple, and process is controllable, and product quality is steady
It is fixed and excellent, it is with good economic efficiency, and the automation technolo degree is high, can operate continuously, high production efficiency.The present invention
The process flow is simple, it is easy to accomplish, operating cost is low, meets sustainable development requirement, can be widely applied to practical work
In industry production process.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is that the device structure schematic diagram of MVR technology recovery waste heat is utilized described in the embodiment of the present invention 1.
Appended drawing reference indicates in figure are as follows: 1- Falling film heat transfer device；2- falling film separator；3- second separator；4- neutral section；
5- compressor；6- hydrops device；7- vacuum pump；8- falling liquid film circulating pump；9- recovered water pump；10- discharging pump；11- hydrops pump；12-
Vacuum pump plate heat exchanger.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of equipment using MVR technology recovery waste heat, are used to recycle epoxy chloropropionate alkane rectification mistake
Rectifying tower top waste hot steam is recycled by the waste heat in journey, and the heating of distillation system purification is reused for as new heat source
Steam.
Fig. 1 is please referred to, the equipment using MVR technology recovery waste heat includes passing through the sequentially connected Falling film heat transfer of pipeline
Device 1, falling film separator 2, second separator 3, the Falling film heat transfer device 1 are also connected with a neutral section 4, the neutral section 4
For phase separation tank, the second separator 3 has a compressor 5 and a hydrops device 6 by piping connection, and the hydrops device 6 is
Hydrops holding vessel.
Further, the Falling film heat transfer device 1 is connected with a vacuum pump 7, and the vacuum pump 7 is for controlling Falling film heat transfer device
The pressure of 1 shell side, the Falling film heat transfer device 1 are also connected with a falling liquid film circulating pump 8, and the neutral section 4 is connected with recovered water pump 9
With epoxychloropropane discharging pump 10, the hydrops device 6 is connected with hydrops pump 11, the vacuum pump 7 and the Falling film heat transfer
Vacuum pump plate heat exchanger 12 is additionally provided between device 1.
The Falling film heat transfer device 1 is shell-and-tube heat exchanger, is steamed by the mixing of the epoxychloropropane and water of rectifying tower top recycling
Vapour enters the shell side of Falling film heat transfer device 1 by pipeline, exchanges heat with the water in 1 tube side of Falling film heat transfer device, after heat exchange, epoxy chlorine
The mixed vapour of propane and water is condensed into liquid phase, and steam carries out first time gas-liquid point after turning to water vapour in falling film separator 2
From the water vapour after separation enters 3 secondary separation of second separator, and the water after separation continues to beat by falling liquid film circulating pump 8
It returns in Falling film heat transfer device 1 and exchanges heat with epoxychloropropane and water mixed vapour, so recycle.
The mixture for condensing obtained liquid phase epoxidation chloropropane and water is flow in neutral section 4 by pipeline, is separated,
The epoxychloropropane isolated is as product, and by 11 transmitting system of epoxychloropropane discharging pump, remaining water is recycled by water is
System recycles.The neutral section 4 is connected to the Falling film heat transfer device 1 by recovered water pump 9, and the neutral section 4 passes through
Gravity Separation obtains water, is sent back in Falling film heat transfer device 1 by recovered water pump 9, as the water source of 1 tube side of Falling film heat transfer device, with ring
Oxygen chloropropane and water mixed vapour become water vapour after carrying out heat exchange.Water vapour enters compressor 5, is done work by compressor 5
The temperature and pressure for improving water vapour is used as the heating steam of rectifying column as new heat source discharge system.
Embodiment 2
The present embodiment provides a kind of technique using equipment recovery waste heat described in embodiment 1, the technique is for handling
Flow is the epoxychloropropane and water mixed vapour of 15.25t/h, and wherein the flow of epoxychloropropane is the flow of 6.25t/h, water
For 9t/h, the technique includes the following steps:
S1, the waste heat for recycling rectifying tower top epoxychloropropane and water mixed vapour, by the epoxychloropropane and water after rectifying
Mixed vapour made it into Falling film heat transfer device 1 and exchange heat by pipeline as heat source, specifically, mixed vapour enters falling liquid film and changes
Water in the shell side of hot device 1, with 1 tube side of Falling film heat transfer device exchanges heat, and condenses after epoxychloropropane and the heat exchange of water mixed vapour
For the mixing liquid of epoxychloropropane and water, mixing liquid flow to point connecting with 1 shell side of Falling film heat transfer device by pipeline
Phase device 4；Gasification is water vapour and carries out first time gas-liquid separation, gas-liquid in falling film separator 2 after water heat exchange in tube side
After separation, water vapour enters in the second separator 3 connecting with the falling film separator 2, and the water isolated is recycled by falling liquid film
Pump 8 is returned in Falling film heat transfer device 1 and is exchanged heat with the mixed vapour of epoxychloropropane and water, is so recycled.Wherein, epoxychloropropane and
Water mixed vapour temperature is 75 DEG C, pressure 46KPa, and the temperature of water is 70 DEG C in tube side, pressure 31KPa.
S2, separation epoxychloropropane and water separate the mixing liquid that step S1 is obtained by neutral section 4, respectively
To epoxychloropropane product and water, since the epoxychloropropane of liquid phase is not soluble in water, and the density of epoxychloropropane is 1.18g/
cm3, than water weight, acted on by gravitational settling, epoxychloropropane is sunken to bottom, and water swims in top, by partition by water overflow
To the other side of phase separation tank, so that the two be separated, the epoxychloropropane isolated is as product, yield 6.25t/h, temperature
It is 75 DEG C, passes through 10 transmitting system of epoxychloropropane discharging pump.
The water of S3, step S2 isolated water is 9t/h, and temperature is 75 DEG C, and water is recycled to by recovered water pump 9
The Falling film heat transfer device 1 exchanges heat with the mixed vapour of epoxychloropropane and water as the water source of tube side, is changed into water vapour.
S4, water vapour heat content is improved using MVR technology as new heat source, the isolated water vapour of falling film separator 2 enters two
Secondary separator 3 carries out second of gas-liquid separation, cleaner water vapour is obtained, subsequently into compressor 5.Wherein enter compression
The temperature of water vapour is 70 DEG C, force pressure 31KPa before machine 5, and after the compression of compressor 5, temperature rises to 90 DEG C, and pressure improves
The heating steam of rectifying column is used as new heat source discharge system to 70KPa.Compressor 5 is connected with secondary steaming
The big pipeline of vapour, remaining condensation hydrops flow to hydrops tank in big pipeline in start process, and is sent into falling liquid films by hydrops pump 11 and separates
In device 2, as water source reuse.
Experimental example
Waste heat reclaiming process described in testing example 2 handles magnitude operation energy consumption during handling rectifying epoxychloropropane
Situation, the results are shown in Table 1.
Table 1
The above results show that a kind of waste heat recovery apparatus and technique using MVR technology as described in example 2 has energy consumption
With the advantages that at low cost, yield is high, simple process, number of devices are few, construction investment is few, year cost can be reduced by 10,437,084
Member.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (9)
1. a kind of equipment using MVR technology recovery waste heat, which is characterized in that including sequentially connected Falling film heat transfer device, falling liquid film
Separator, second separator, the Falling film heat transfer device are connected with neutral section, and the second separator is connected with compressor and product
Liquid device.
2. the equipment according to claim 1 using MVR technology recovery waste heat, which is characterized in that told Falling film heat transfer device
Be also connected with a vacuum pump, the falling film separator is connected with falling liquid film circulating pump, the neutral section be connected with recovered water pump and
Discharging pump.
3. the equipment according to claim 2 using MVR technology recovery waste heat, which is characterized in that the hydrops device connects
It is connected to hydrops pump.
4. a kind of technique for carrying out waste heat recycling using equipment as described in any one of claims 1-3, which is characterized in that including
Following steps:
S1, it the mixed vapour of epoxychloropropane and water after rectifying is entered in Falling film heat transfer device as heat source exchanges heat, it is described mixed
Close the mixing liquid that steam is condensed into epoxychloropropane and water；
S2, separation epoxychloropropane and water, the mixing liquid that step S1 is obtained are separated by neutral section, respectively obtain epoxy
Chloropropane product and water；
S3, the obtained water of step S2 is recycled to the Falling film heat transfer device, exchanged heat with the mixed vapour of epoxychloropropane and water, turned
Become water vapour；
S4, the water vapour for obtaining step S3 are sent into compressor, improve the temperature and pressure of water vapour.
5. waste heat reclaiming process according to claim 4, which is characterized in that the step S4 specifically: obtain step S3
To water vapour gas phase and liquid phase are further separated by second separator after, water vapour is sent into compressor, and compressor is passed through
Acting improves the temperature and pressure of water vapour, after step S4 processing, 90 DEG C of the temperature of steam, pressure 70KPa.
6. waste heat reclaiming process according to claim 5, which is characterized in that epoxychloropropane described in the step S1
Mixed vapour temperature with water is 75 DEG C, pressure 46KPa.
7. waste heat reclaiming process according to claim 6, which is characterized in that the Falling film heat transfer device is pipe shell type heat exchange
The mixed vapour of device, the epoxychloropropane and water is used as heat source in shell side, and water is flowed in tube side as heat transferring medium, water
Temperature be 70 DEG C, pressure 31KPa.
8. waste heat reclaiming process according to claim 7, which is characterized in that the temperature and pressure that the step S4 is obtained mentions
High water vapour is as distilling the heating steam for producing epoxychloropropane.
9. waste heat reclaiming process according to claim 8, which is characterized in that the step S2 specifically: by liquid phase epoxidation
The mixture of chloropropane and water is passed through neutral section, and liquid phase epoxidation chloropropane is not soluble in water and density is greater than water, epoxychloropropane
It is sunken to neutral section bottom, water is swum at the top of epoxychloropropane, by partition by water overflow to the neutral section other side, i.e., will
Epoxychloropropane and water separation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810841461.XA CN109134405B (en) | 2018-07-27 | 2018-07-27 | Waste heat recovery equipment and process utilizing MVR technology |
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| CN201810841461.XA CN109134405B (en) | 2018-07-27 | 2018-07-27 | Waste heat recovery equipment and process utilizing MVR technology |
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| CN109134405A true CN109134405A (en) | 2019-01-04 |
| CN109134405B CN109134405B (en) | 2022-05-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114229936A (en) * | 2021-12-16 | 2022-03-25 | 常州中源工程技术有限公司 | Ammonia water MVR stripping system and stripping method thereof |
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| CN101665474A (en) * | 2009-09-23 | 2010-03-10 | 中昊晨光化工研究院 | Method for recovering epoxy chloropropane from wastewater containing epoxy chloropropane |
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| CN104819448A (en) * | 2015-03-04 | 2015-08-05 | 中国天辰工程有限公司 | Energy supply system of epoxy chloropropane saponification technology |
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| CN106474755A (en) * | 2016-09-27 | 2017-03-08 | 深圳市瑞升华科技股份有限公司 | Integral type falling film evaporation separator |
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| CN1931848A (en) * | 2006-09-28 | 2007-03-21 | 蓝星化工新材料股份有限公司无锡树脂厂 | Process of recovering epoxy chloropropane from effluent |
| CN101665474A (en) * | 2009-09-23 | 2010-03-10 | 中昊晨光化工研究院 | Method for recovering epoxy chloropropane from wastewater containing epoxy chloropropane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114229936A (en) * | 2021-12-16 | 2022-03-25 | 常州中源工程技术有限公司 | Ammonia water MVR stripping system and stripping method thereof |
| CN114229936B (en) * | 2021-12-16 | 2023-11-28 | 常州中源工程技术有限公司 | Ammonia water MVR stripping system and stripping method thereof |
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| CN109134405B (en) | 2022-05-17 |
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