CN104315871A - Molten-salt-furnace outlet flue gas heat energy recovery method in melamine production - Google Patents
Molten-salt-furnace outlet flue gas heat energy recovery method in melamine production Download PDFInfo
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- CN104315871A CN104315871A CN201410593082.5A CN201410593082A CN104315871A CN 104315871 A CN104315871 A CN 104315871A CN 201410593082 A CN201410593082 A CN 201410593082A CN 104315871 A CN104315871 A CN 104315871A
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—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
- Y02P20/10—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
- Y02P20/141—Feedstock
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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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Abstract
The invention relates to a molten-salt-furnace outlet flue gas heat energy recovery method in melamine production. The method includes the following steps: a, additionally arranging a heat exchange device between a position in rear of a molten-salt flue outlet and a position in front of a molten-salt waste heat boiler; b, bringing high-temperature flue gas of a molten-salt-furnace outlet in to heat a carbon dioxide gas from a carbon dioxide storage tank, delivering the carbon dioxide gas subjected to heat exchange to a jacket shell and a valve jacketed pipe of a crystallization system through pressurization by a fan, and circulating the carbon dioxide gas to an inlet of a heat insulation fan through a return pipe. By the method, heat energy losses of a molten-salt carrier-gas preheater is greatly reduced, so that heat consumption of molten salt during circular heat exchange is directly reduced, and soft coal consumed for heating the molten salt by a molten salt furnace is effectively reduced. On the condition of increase of heat exchange area, the flue gas exhaust temperature of the molten salt furnace is remarkably reduced, technological needs of the crystallization system are met, and stability in technological parameter of the crystallization system is guaranteed.
Description
Technical field
The invention belongs to chemical production technical field, relate to molten salt furnace exiting flue gas heat energy recovering method in Melamine Production.
Background technology
Melamine is a kind of important chemical industry intermediate products, is polymerized and can obtains melmac, can be used for plastics and coatings industry with formaldehyde condensation, also can do the anti-folding of yarn fabric, anti-shrinking agent.Its modified resin can do lovely luster, the metallic paint that durable, hardness is good.It also can be used for firm, heat-resisting fancy veneer, and moistureproof paper and grey leather are tanned the bonding agent of skin agent, synthesizing fireproof laminate, the fixative of waterproofing agent or curing agent etc.Be obtained 582 melmacs of raw material by melamine, formaldehyde, butanols.As the levelling agent of solvent borne polyurethane coating, effect spy is good.Also tanning agent and the filler of leather processing is made for synthesis that is organic and resin.Be polymerized with formaldehyde condensation and can obtain melmac, can be used for plastics and coatings industry, also can do the anti-folding of yarn fabric, anti-shrinking agent.Its modified resin can do lovely luster, the metallic paint that durable, hardness is good.Melamine be polymerized with formaldehyde condensation the melmac made be widely used in Wood construction formwork manufacture and in processing.Can be used for the waterproof of template surface and the adhesion of block board, what increase template reuses number of times.
In Melamine Production in the past, because molten salt furnace back segment flue gas system only has a waste heat boiler and air preheater to carry out energy recovery, energy recovery effect in flue gas is poor, and air-introduced machine exit gas temperature is discharged from chimney at about 200 DEG C always.Containing huge heat energy in the flue gas of flood tide, it is directly thrown in air and causes very large waste.And Melamine Production Zhong Hou workshop section crystal system is because need Surgery therapy to keep apparatus body temperature more than 260 ° simultaneously, need a large amount of steam to be incubated, steam consumption is large.
Summary of the invention:
Object of the present invention is just to provide the method for molten salt furnace exiting flue gas energy recovery in a kind of Melamine Production, namely reduces chimney outlet temperature, additionally reduces crystal system insulation steam consumption.
Technical scheme of the present invention is as follows:
A method for molten salt furnace exiting flue gas energy recovery in Melamine Production, comprises the following steps:
A, between molten salt furnace flue outlet and waste heat boiler, set up a flue gas heat-exchange unit, an insulation blower fan is separately set, insulation fan inlet connects carbon dioxide storage tank by pipeline, insulation fan outlet is connected to flue gas heat-exchange unit by pipeline, flue gas heat-exchange unit is connected to crystal system by pipeline, and crystal system is connected to insulation fan inlet by pipeline again;
B, utilize molten salt furnace to export the high-temperature flue gas of 450 DEG C, the CO 2 raw material gas sent here by carbon dioxide storage tank by insulation blower fan is heated, and CO 2 raw material gas is sent to the insulation jacket of crystal system and each process valve after being warmed up to 300 DEG C;
Heated again to insulation fan inlet by back of pipeline after c, CO 2 raw material gas heat exchange.
Deliver to the chuck of crystal system after carbon dioxide gas is pressurizeed by fan outlet through smoke-gas preheater, walk shell side.Be back to heat exchange fan inlet by return after heat exchange to heat again.Preheater flue gas flow process leaves shortcut, middle mounted valve, and for regulating the exhaust gas volumn size through preheater, the resistance being convenient to control preheater outlet process carrier gas temperature and molten salt furnace flue gas system regulates.Regularly unstripped gas is supplied from carbon dioxide storage tank again when the system pressure being incubated blower fan is too low.Gas forms a closed cycle, makes the constantly heat exchange of the heat energy of flue outlet deliver to system and provides heat energy.Reduce flue temperature, recovery heat energy, reduce the consumption of crystal system insulation steam.
The present invention will greatly reduce the heat energy loss of fused salt carrier gas preheater, thus directly decreases the heat exhaustion of fused salt in cycle heat exchange process, makes molten salt furnace be that the bituminous coal that heating fused salt consumes measures effective decline.Meanwhile, when increasing heat exchange area, also making the smog discharge temperature of molten salt furnace have also been obtained and declining to a great extent, meeting the technique needs of crystal system simultaneously, guarantee that crystal system technological parameter is stablized.Energy-saving effect is by fairly obvious.
Accompanying drawing illustrates:
Fig. 1 is process flow diagram provided by the invention.
Specific implementation method
Example one:
As shown in Figure 1, the method for molten salt furnace exiting flue gas energy recovery in a kind of Melamine Production provided by the invention, comprises following existing basic process steps:
A flue gas heat-exchange unit is set up between molten salt furnace flue outlet and waste heat boiler, an insulation blower fan is separately set, insulation fan inlet connects carbon dioxide storage tank by pipeline, insulation fan outlet is connected to flue gas heat-exchange unit by pipeline, flue gas heat-exchange unit is connected to crystal system by pipeline, and crystal system is connected to insulation fan inlet by pipeline again.
Normal temperature carbon dioxide is sent into flue gas heat-exchange unit by being incubated fan outlet pressurization, and effluent gas temperature 450 DEG C, after heat exchange, carbon dioxide gas temperature is 235 DEG C, and the carbon dioxide after heating delivers to the chuck of crystal system, walks shell side.Crystal system temperature is at 200 DEG C.Crystal system insulation just can meet raw technique needs without steam, steam saving per hour 1.9 tons.After heat exchange, carbon dioxide is back to heat exchange fan inlet by return and heats.Regulate the exhaust gas volumn size through flue gas heat-exchange unit by flue gas flow shortcut, control the resistance of flue gas heat-exchange unit outlet process carrier gas temperature and molten salt furnace flue gas system.Be incubated in circulating-heating process the system pressure of blower fan too low time supply from carbon dioxide storage tank in good time.
Example two:
Existing basic process steps with embodiment one,
The method of molten salt furnace exhaust pass gas energy recovery in the Melamine Production that the present invention relates to, comprises the following steps:
Pressurizeed by fan outlet by normal temperature carbon dioxide and send into economizer, effluent gas temperature 453 DEG C, after heat exchange, carbon dioxide gas temperature is 238 DEG C, and the carbon dioxide after heating delivers to the chuck of crystal system, walks shell side.Crystal system temperature is at 202 DEG C.Crystal system insulation just can meet raw technique needs without steam, steam saving per hour 2.1 tons.Be back to heat exchange fan inlet by return after heat exchange to heat again.Regulate the exhaust gas volumn size through preheater by flue gas flow shortcut, control the resistance of preheater outlet process carrier gas temperature and molten salt furnace flue gas system.Be incubated in circulating-heating process the system pressure of blower fan too low time supply from carbon dioxide storage tank in good time.
Claims (2)
1. molten salt furnace exiting flue gas heat energy recovering method in Melamine Production, is characterized in that comprising the following steps:
A, between molten salt furnace flue outlet and waste heat boiler, set up a flue gas heat-exchange unit, an insulation blower fan is separately set, insulation fan inlet connects carbon dioxide storage tank by pipeline, insulation fan outlet is connected to flue gas heat-exchange unit by pipeline, flue gas heat-exchange unit is connected to crystal system by pipeline, and crystal system is connected to insulation fan inlet by pipeline again;
CO 2 raw material gas in carbon dioxide storage tank is delivered in flue gas heat-exchange unit by b, insulation blower fan, utilizes molten salt furnace to export the high-temperature flue gas of 450 DEG C, is sent to the insulation jacket of crystal system and each process valve after CO 2 raw material gas being warmed up to 300 DEG C;
C, in crystal system, after CO 2 raw material gas heat exchange by back of pipeline flow to insulation fan inlet heat again.
2. molten salt furnace exiting flue gas heat energy recovering method in Melamine Production according to claim 1, is characterized in that: when the system pressure of insulation blower fan is lower than setting value, more regularly supply CO 2 raw material gas from carbon dioxide storage tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410593082.5A CN104315871B (en) | 2014-10-30 | 2014-10-30 | Molten salt furnace outlet smoke heat energy recovery method in Melamine Production |
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| CN201410593082.5A CN104315871B (en) | 2014-10-30 | 2014-10-30 | Molten salt furnace outlet smoke heat energy recovery method in Melamine Production |
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| CN104315871A true CN104315871A (en) | 2015-01-28 |
| CN104315871B CN104315871B (en) | 2016-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010674A (en) * | 2022-07-05 | 2022-09-06 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1138676A1 (en) * | 2000-03-27 | 2001-10-04 | Casale Chemicals SA | Process for producing melamine at high pureness |
| CN101863848A (en) * | 2010-05-28 | 2010-10-20 | 北京烨晶科技有限公司 | System and method for preparing melamine |
| CN102276544A (en) * | 2011-05-08 | 2011-12-14 | 徐建华 | Production equipment, energy-saving production system and production method for melamine |
| CN102391197A (en) * | 2011-09-24 | 2012-03-28 | 安徽金禾实业股份有限公司 | Method for refining melamine by using waste heat of crude melamine product |
| CN102898390A (en) * | 2012-11-07 | 2013-01-30 | 马肃 | Method for heating triamine reactor carrier gas with flue gas of molten salt furnace |
| CN103570636A (en) * | 2013-11-16 | 2014-02-12 | 安徽金禾实业股份有限公司 | Method for heating melamine circulation carrying gas by flue gas produced by molten salt furnace |
-
2014
- 2014-10-30 CN CN201410593082.5A patent/CN104315871B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1138676A1 (en) * | 2000-03-27 | 2001-10-04 | Casale Chemicals SA | Process for producing melamine at high pureness |
| CN101863848A (en) * | 2010-05-28 | 2010-10-20 | 北京烨晶科技有限公司 | System and method for preparing melamine |
| CN102276544A (en) * | 2011-05-08 | 2011-12-14 | 徐建华 | Production equipment, energy-saving production system and production method for melamine |
| CN102391197A (en) * | 2011-09-24 | 2012-03-28 | 安徽金禾实业股份有限公司 | Method for refining melamine by using waste heat of crude melamine product |
| CN102898390A (en) * | 2012-11-07 | 2013-01-30 | 马肃 | Method for heating triamine reactor carrier gas with flue gas of molten salt furnace |
| CN103570636A (en) * | 2013-11-16 | 2014-02-12 | 安徽金禾实业股份有限公司 | Method for heating melamine circulation carrying gas by flue gas produced by molten salt furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115010674A (en) * | 2022-07-05 | 2022-09-06 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
| CN115010674B (en) * | 2022-07-05 | 2023-11-07 | 山东省舜天化工集团有限公司 | Melamine production resource recycling system and recycling method |
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| CN104315871B (en) | 2016-05-25 |
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