CN104085900A - Method for cooling synthetic ammonia by using urea work section high-pressure temperature-regulation water waste heat - Google Patents

Method for cooling synthetic ammonia by using urea work section high-pressure temperature-regulation water waste heat Download PDF

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Publication number
CN104085900A
CN104085900A CN201410280950.4A CN201410280950A CN104085900A CN 104085900 A CN104085900 A CN 104085900A CN 201410280950 A CN201410280950 A CN 201410280950A CN 104085900 A CN104085900 A CN 104085900A
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CN
China
Prior art keywords
synthetic ammonia
waste heat
urea
lithium bromide
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410280950.4A
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Chinese (zh)
Inventor
高建平
李文波
高中芹
曹伟娜
张成军
王春丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANDONG JINMEI MINGSHUI CHEMICAL GROUP Co Ltd
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SHANDONG JINMEI MINGSHUI CHEMICAL GROUP Co Ltd
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Application filed by SHANDONG JINMEI MINGSHUI CHEMICAL GROUP Co Ltd filed Critical SHANDONG JINMEI MINGSHUI CHEMICAL GROUP Co Ltd
Priority to CN201410280950.4A priority Critical patent/CN104085900A/en
Publication of CN104085900A publication Critical patent/CN104085900A/en
Pending legal-status Critical Current

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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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems
    • 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
    • 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
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention relates to a method for cooling synthetic ammonia by using urea work section high-pressure temperature-regulation water waste heat. Urea is produced by using a carbon dioxide stripping method, high-pressure temperature-regulation water generated by a high-pressure scrubber is subjected to heat exchange through a lithium bromide refrigerating unit and then is transported back to the high-pressure scrubber for recycling, at the same time, cold water is prepared by the lithium bromide refrigerating unit and is transported to a synthetic ammonia system lithium bromide cooler by a pipeline to cool the synthetic ammonia gas. The method has the beneficial effects that with utilization of the lower-grade urea high-pressure temperature-regulation water waste heat, the low-temperature cold water produced by absorption-type refrigeration of the lithium bromide refrigerating unit cools the synthetic ammonia gas discharged by water cooling, energy saving and consumption reduction can be achieved, the load of an ice machine is reduced, the purposes of energy saving and consumption reduction in the synthesis process are further achieved, and comprehensive benefits are increased.

Description

A kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section
Technical field
The technique that the present invention relates to a kind of energy recovery utilization refrigeration, belongs to energy refrigerating field, specifically a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section.
Background technology
Adopt carbon dioxide stripping process to prepare urea, during production, high pressure scrubber produces the high water transfer of 135 ℃, common process is cooled with circulating water high water transfer to 120 ℃, the high pressure scrubber that refluxes again recycles, do not utilize the waste heat of high water transfer, wasted heat energy, and recirculated water cooling requires the expenditure of energy also, for save energy, utilize existing resource, my company is in conjunction with synthetic ammonia workshop section refrigeration requirement, the low grade heat energy of high water transfer is passed through to the heat exchange of lithium bromide refrigerating unit, not only lofty tone water temp is reduced to and is met the requirements, backflow high pressure scrubber continues to use, make cold water simultaneously, can by pipeline, deliver to the cooling device of synthesis ammonia system lithiumbromide by in-line pump, the cooling synthetic ammonia gas ejecting through water-cooled, reduce its temperature, and former synthetic ammonia gas cooling is all provided by ice maker refrigeration, energy loss is huge, so not only reduce follow-up ice maker load, and saving power consumption.In a word, technique of the present invention by the absorption refrigeration of lithium bromide refrigerating unit, fully utilizes save energy, remarkable benefit by the waste heat of high water transfer.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high water transfer utilizing waste heat for refrigeration method that recoverable urea high-pressure washer flows out.
The concrete scheme that the present invention proposes is: a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section, 130 ℃ of-135 ℃ of high water transfer that urea workshop section high pressure scrubber produces are by the heat exchange of lithium bromide refrigerating unit, temperature is down to 115 ℃-120 ℃, transport again high pressure scrubber recycle back, the heat of the high water transfer that described lithium bromide refrigerating unit obtains is prepared cold water, by in-line pump, by pipeline, be delivered to the cooling device of synthesis ammonia system lithiumbromide, cooling synthetic ammonia gas of discharging through water-cooled.
130 ℃ of-135 ℃ of high volume of water diversion that described urea workshop section high pressure scrubber produces are 275 m 3/ h-325 m 3/ h.
The flow that described lithium bromide refrigerating unit is prepared cold water is 400m 3/ h-650m 3/ h, delivers to the cooling device of synthesis ammonia system lithiumbromide by the pipeline of DN300.
The temperature that described lithium bromide refrigerating unit is prepared cold water is 6 ℃-9 ℃.
Described cooling synthetic ammonia volumetric flow of gas of discharging through water-cooled is 1 * 10 5nm 3/ h-1.2 * 10 5nm 3/ h, reduces by 5 ℃-7 ℃.
Former synthetic ammonia gas cooling is all provided by ice maker refrigeration, utilizes the technological transformation of the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section through the present invention, and the ice maker load that reducing synthetic ammonia gas temperature needs alleviates greatly, has saved power consumption.
Usefulness of the present invention is:
Compared with prior art, the present invention, by the high water transfer waste heat recovery of urea, with first ammonium absorption condensation generation 4,500,000 kcal/h to the 500 ten thousand kcal/h heat Calculation of high pressure scrubber, utilizes 280 m 3/ h, the high water transfer of 130 ℃ of left and right, after heat exchange, recovered temperature is reduced to 115 ℃, can effectively utilize the waste heat of 4,000,000 kcal/h, secondly, the present invention utilizes the high water transfer waste heat of urea that grade is lower, adopt the absorption refrigeration of lithium bromide refrigerating unit to produce the cooling synthetic ammonia gas of discharging through water-cooled of low-temperature cold water, can realize energy-saving and cost-reducingly, reduce ice maker load, further realize the energy-saving and cost-reducing object of synthesis technique, increase comprehensive benefit.
Accompanying drawing explanation
Fig. 1 utilizes the cooling ammonia synthesis process schematic flow sheet of the high water transfer waste heat of urea workshop section.
Embodiment
Embodiment 1
Utilize carbon dioxide stripping process to produce urea, while normally producing, high pressure scrubber produces high water transfer 280 m of 135 ℃ 3/ h, by the heat exchange of lithium bromide refrigerating unit, temperature is down to 120 ℃, then transports high pressure scrubber recycle back, and it is 400m that the heat of the high water transfer that lithium bromide refrigerating unit obtains is prepared 6 ℃ of flows 3/ h cold water, is delivered to the cooling device of synthesis ammonia system lithiumbromide by in-line pump by DN300 pipeline, cooling synthetic ammonia gas 1 * 10 of discharging through water-cooled 5nm 3/ h, has reduced by 5 ℃.
Embodiment 2
Utilize carbon dioxide stripping process to produce urea, while normally producing, high pressure scrubber produces the high water transfer 300m of 132 ℃ 3/ h, by the heat exchange of lithium bromide refrigerating unit, temperature is down to 118 ℃, then transports high pressure scrubber recycle back, and it is 550m that the heat of the high water transfer that lithium bromide refrigerating unit obtains is prepared 7 ℃ of flows 3/ h cold water, is delivered to the cooling device of synthesis ammonia system lithiumbromide by in-line pump by DN300 pipeline, cooling synthetic ammonia gas 1.1 * 10 of discharging through water-cooled 5nm 3/ h, has reduced by 6 ℃.
Embodiment 3
Utilize carbon dioxide stripping process to produce urea, while normally producing, high pressure scrubber produces the high water transfer 325m of 130 ℃ 3/ h, by the heat exchange of lithium bromide refrigerating unit, temperature is down to 115 ℃, then transports high pressure scrubber recycle back, and it is 650m that the heat of the high water transfer that lithium bromide refrigerating unit obtains is prepared 9 ℃ of flows 3/ h cold water, is delivered to the cooling device of synthesis ammonia system lithiumbromide by in-line pump by DN300 pipeline, cooling synthetic ammonia gas 1.2 * 10 of discharging through water-cooled 5nm 3/ h, has reduced by 7 ℃.

Claims (5)

1. a method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section, 130 ℃ of-135 ℃ of high water transfer that urea workshop section high pressure scrubber produces are by the heat exchange of lithium bromide refrigerating unit, temperature is down to 115 ℃-120 ℃, transport again high pressure scrubber recycle back, the heat that it is characterized in that the high water transfer that described lithium bromide refrigerating unit obtains is prepared cold water, by in-line pump, by pipeline, be delivered to the cooling device of synthesis ammonia system lithiumbromide, cooling synthetic ammonia gas of discharging through water-cooled.
2. a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section according to claim 1, is characterized in that 130 ℃ of-135 ℃ of high volume of water diversion that described urea workshop section high pressure scrubber produces are 275 m 3/ h-325 m 3/ h.
3. a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section according to claim 2, is characterized in that it is 400m that described lithium bromide refrigerating unit is prepared the flow of cold water 3/ h-650m 3/ h, delivers to the cooling device of synthesis ammonia system lithiumbromide by the pipeline of DN300.
4. according to a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section described in claim 1-3 any one, it is characterized in that it is 6 ℃-9 ℃ that described lithium bromide refrigerating unit is prepared the temperature of cold water.
5. a kind of method of utilizing the cooling synthetic ammonia of the high water transfer waste heat of urea workshop section according to claim 4, is characterized in that described cooling synthetic ammonia volumetric flow of gas of discharging through water-cooled is 1 * 10 5nm 3/ h-1.2 * 10 5nm 3/ h, reduces by 5 ℃-7 ℃.
CN201410280950.4A 2014-06-23 2014-06-23 Method for cooling synthetic ammonia by using urea work section high-pressure temperature-regulation water waste heat Pending CN104085900A (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106621632A (en) * 2016-12-30 2017-05-10 安徽昊源化工集团有限公司 Low-level heat energy recycling method of urea scrubbing tower
CN106767026A (en) * 2016-12-30 2017-05-31 安徽昊源化工集团有限公司 Urea vaporizing extract process production mesohigh washer shell side lofty tone hydro-thermal utilizes Processes and apparatus
CN107855084A (en) * 2017-10-30 2018-03-30 新奥泛能网络科技股份有限公司 Ammonia plant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670833A (en) * 1979-11-13 1981-06-13 Toray Ind Inc Heat recovering method
JPH0237262A (en) * 1988-07-26 1990-02-07 Agency Of Ind Science & Technol Device for utilizing waste heat of fuel battery
DE102006039347A1 (en) * 2006-08-22 2008-03-06 Johann Dietrich Mehrkens Ship cooling method, involves producing cooling air by using waste heat from exhaust gas and cooling water of diesel engines, storing cooling air as ice, and using substance-pair of water-lithium bromide for air conditioning
CN203083196U (en) * 2012-12-18 2013-07-24 河北科技大学 Device for producing low-temperature water by means of urea waste heat
CN103697620A (en) * 2013-12-25 2014-04-02 山西兰花科技创业股份有限公司 Waste heat refrigeration method and device of urea high pressure temperature regulation water

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5670833A (en) * 1979-11-13 1981-06-13 Toray Ind Inc Heat recovering method
JPH0237262A (en) * 1988-07-26 1990-02-07 Agency Of Ind Science & Technol Device for utilizing waste heat of fuel battery
DE102006039347A1 (en) * 2006-08-22 2008-03-06 Johann Dietrich Mehrkens Ship cooling method, involves producing cooling air by using waste heat from exhaust gas and cooling water of diesel engines, storing cooling air as ice, and using substance-pair of water-lithium bromide for air conditioning
CN203083196U (en) * 2012-12-18 2013-07-24 河北科技大学 Device for producing low-temperature water by means of urea waste heat
CN103697620A (en) * 2013-12-25 2014-04-02 山西兰花科技创业股份有限公司 Waste heat refrigeration method and device of urea high pressure temperature regulation water

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106621632A (en) * 2016-12-30 2017-05-10 安徽昊源化工集团有限公司 Low-level heat energy recycling method of urea scrubbing tower
CN106767026A (en) * 2016-12-30 2017-05-31 安徽昊源化工集团有限公司 Urea vaporizing extract process production mesohigh washer shell side lofty tone hydro-thermal utilizes Processes and apparatus
CN107855084A (en) * 2017-10-30 2018-03-30 新奥泛能网络科技股份有限公司 Ammonia plant

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Application publication date: 20141008