CN1447084A - Vapor recovery technique for top of dehydration tower of ethylene glycol in uniset of polyester direct spinning staple fibre - Google Patents
Vapor recovery technique for top of dehydration tower of ethylene glycol in uniset of polyester direct spinning staple fibre Download PDFInfo
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- CN1447084A CN1447084A CN 03108793 CN03108793A CN1447084A CN 1447084 A CN1447084 A CN 1447084A CN 03108793 CN03108793 CN 03108793 CN 03108793 A CN03108793 A CN 03108793A CN 1447084 A CN1447084 A CN 1447084A
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Abstract
PET direct spinning short fibre combined device and glycol dehyration tower tower top steam recovery technology changes the pressent state of no way to recover steam due to rather low operation pressure in PET production, utilizing an absorbing tower to recover and produce 100 deg.c hot water and making full use of the advantage and present state of the combined device to use LI bromide absorption refrigerator and water-water heat exchanger to recover the heat utterly to provide 7 deg.C cold water and heating medium to central air conditioning system to realize circulation, recovery and utilization continuously.
Description
2, technical field that the present invention belongs to: the polyester chemical fibre is produced
3, invention technical background: this technology is an important step in the production of polyester, and its present situation is because glycol dehydration overhead vapours absolute pressure only has 1.013kgf/cm
2, pressure rating is very low, can't recycle, and existing this part steam of technology only is through the phegma of circulation cooling water heat exchanger cooling as the glycol dehydration tower, redundance discharging.The straight spinning short fiber device of polyester glycol dehydration overhead vapours reclaims technology and has solved owing to the low unserviceable problem of glycol dehydration overhead vapours pressure.
4, Fa Ming purpose: realize the abundant recycling of the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours heat.
5, Fa Ming technical scheme: the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours reclaims the technology utilization absorption tower with glycol dehydration cat head 1.013kgf/cm
2Steam heat changes into 100 ℃ hot water, 7 ℃ of chilled waters that utilize lithium-bromide absorption-type refrigerating machine and water-water heat exchanger to produce again to use and heat medium for the fiber building central air-conditioning, 100 ℃ hot water after heat exchange is cooled to 60 ℃ and loops back the absorption tower and recycle, when the required heat medium load of central air-conditioning increases, heat as a supplement by steam-water-to-water heat exchanger.
6, the beneficial effect of the invention: existing technology uses recirculated cooling water with the condensation of glycol dehydration overhead vapours, and heat is recycled cooling water and takes away, and does not create any benefit; The straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours reclaims technology and this part heat can be made full use of, the explanation of giving an example: the straight spinning short fiber combined unit of polyester of producing 120000 tons per year, its glycol dehydration overhead vapours amount is 7.1 tons/hour, and its present situation is to utilize 500m
3The recirculated cooling water heat exchange condensation of/h; Straight spinning short fiber production must use central air-conditioning to be technology and production place cooling, heat supply, and its present situation is to use summer mechanical refrigeration to provide 7 ℃ chilled water as central air-conditioning, and power load is 1250KW.h, recirculated cooling water consumption 1500m
3The consumption of/h, heat medium steam is 2 tons/hour, and winter, power load was 100KW.h, 7 tons/hour of steam consumptions, cooling water amount 500m
3/ h, refrigeration machine is stopped using.And use the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours recovery technology power load in summer is 2 tons/hour of 250KW.h, steam consumptions, reduces power load 1000KW.h relatively, reduces recirculated cooling water consumption 500m
3/ h, winter is no consumption by contrast, reduces by 7 tons/hour steam consumption, reduces recirculated cooling water consumption 500m
3/ h.Press 0.6 yuan/KW.h of the local standard electricity charge, 100 yuan of/ton calculating of steam, use the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours recovery technology direct economic benefit to be by contrast:
Annual calculated in 8000 hours by producing, winter, summer are respectively by calculating 0.6 yuan/KW.h * 1000KW.h * 4000 hour+100 yuan/ton * 7 ton/hour * 4000 hours=5,200,000 yuan/year in 4000 hours
Indirect economic effect just exemplifies some data and is illustrated because no accurate data: winter, summer, the cool cycles water consumption all reduced 500m
3/ h, the load of reduction circulating water system 20%; Reduced by 7.1 tons of/hour steam heats relatively and entered recirculating cooling water system, reduced the evaporation loss that recirculated cooling water brings owing to temperature rise, the rate of water make-up that has reduced recirculating cooling water system; The recirculated cooling water consumption has reduced 500m
3/ h has reduced circulating water treatment medicament use amount relatively, and the system sewerage amount etc.
Investment analysis: because this technology is on the existing system basis former technology have been carried out optimization, the system integration fully, need the equipment of investment that absorption tower, lithium-bromide absorption-type refrigerating machine, two heat exchangers, systemic circulation pump are arranged, comparing former process system investment increases about 2,000,000 yuan relatively, and counter investment is less.
Operating cost compares: lithium-bromide absorption-type refrigerating machine is compared with centrifugal compression refigerating machine, because it is higher relatively that centrifugal compression refigerating machine belongs to the high speed rotating equipment maintenance cost, the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours reclaims technology can reclaim, utilize ethylene glycol overhead vapours heat to greatest extent along with the variation of season, temperature, reduce the heating steam consumption of central air-conditioning, realized that the central air-conditioning operating cost is minimum, and the economy that centrifugal refrigeration machine moves is relatively poor relatively when underload and load variations.
In sum, the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours reclaims technology and compares with existing technology, not only it has good economic benefits and also has social benefit, has not only improved the integrated level of apparatus system, also can make product cost more than 40 yuan of former basis reduction per ton.
7, description of drawings: the glycol dehydration cat head comes steam to enter directly that the 70 ℃ circulating hot waters spray cooling of absorption tower through entering from cat head is laggard goes at the bottom of the absorption tower, behind water circulating pump [11] pressure-raising, be divided into three the tunnel, the one tunnel through through the backflow of control valve [5] as the ethylene glycol tower; One the tunnel goes back to the absorption tower after control valve [6] enters the lithium-bromide absorption-type refrigerating machine heat exchange, it is recycling that 7 ℃ of chilled waters that lithium-bromide absorption-type refrigerating machine is produced are sent into central air-conditioning through chilled water circulating pump [12]; One the tunnel enter water-water heat exchanger [1] heat exchange after, be used for guarantee absorbing column bottom temperature by control valve [7] respectively and be not less than 100 ℃, guarantee the stable of tower top temperature by control valve [8] control when absorbing tower top temperature and raise through the water yield of water recirculator [2]; Under driving, circulating pump [13] enters the temperature of steam heater [3] through the central air-conditioning after water-water heat exchanger [1] heat exchange with heat medium by control valve [4] control heat medium, desalted water is by the liquid level of control valve [9] control stable absorption tower, control valve [10] the control discharging water yield, the cat head fixed gas enters atmosphere.
8, Fa Ming the specific embodiment: the straight spinning short fiber device of polyester glycol dehydration overhead vapours is reclaimed process application in existing process units, former technological process is undergone technological transformation, and in technological design from now on, promote the use of.
Claims (2)
1, the straight spinning short fiber combined unit of polyester glycol dehydration overhead vapours reclaims technology, it is characterized by: used the absorption tower that steam heat is converted into 100 ℃ hot water, utilized to absorb 7 ℃ of chilled waters and the heat medium that 100 ℃ of hot water confessing at the bottom of the Tata provide for lithium-bromide absorption-type refrigerating machine, water-water heat exchanger that thermal source produces that the fiber building central air-conditioning uses.
2, with the prior art common characteristic be: all be to adopt 100 ℃ of condensate liquids that condensation gets off overhead reflux, all want the discharge unit condensate liquid as the ethylene glycol tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108793 CN1447084A (en) | 2003-03-31 | 2003-03-31 | Vapor recovery technique for top of dehydration tower of ethylene glycol in uniset of polyester direct spinning staple fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108793 CN1447084A (en) | 2003-03-31 | 2003-03-31 | Vapor recovery technique for top of dehydration tower of ethylene glycol in uniset of polyester direct spinning staple fibre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1447084A true CN1447084A (en) | 2003-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03108793 Pending CN1447084A (en) | 2003-03-31 | 2003-03-31 | Vapor recovery technique for top of dehydration tower of ethylene glycol in uniset of polyester direct spinning staple fibre |
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| CN (1) | CN1447084A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837374A (en) * | 2012-09-18 | 2012-12-26 | 江苏申久化纤有限公司 | Cooling system and method for polyester production device |
| CN103467290A (en) * | 2013-09-18 | 2013-12-25 | 安徽淮化股份有限公司 | Method and apparatus for preparing dimethyl oxalate in process of preparing ethylene glycol from synthesis gas |
-
2003
- 2003-03-31 CN CN 03108793 patent/CN1447084A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837374A (en) * | 2012-09-18 | 2012-12-26 | 江苏申久化纤有限公司 | Cooling system and method for polyester production device |
| CN102837374B (en) * | 2012-09-18 | 2014-12-03 | 江苏申久化纤有限公司 | Cooling system and method for polyester production device |
| CN103467290A (en) * | 2013-09-18 | 2013-12-25 | 安徽淮化股份有限公司 | Method and apparatus for preparing dimethyl oxalate in process of preparing ethylene glycol from synthesis gas |
| CN103467290B (en) * | 2013-09-18 | 2015-12-23 | 安徽淮化股份有限公司 | A kind of preparation method of synthetic gas preparing ethylene glycol technique dimethyl oxalate in preparation and device |
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Addressee: Yao Yunsheng Document name: Notification before expiration of term |
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