CN104315871B - Molten salt furnace outlet smoke heat energy recovery method in Melamine Production - Google Patents

Molten salt furnace outlet smoke heat energy recovery method in Melamine Production Download PDF

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Publication number
CN104315871B
CN104315871B CN201410593082.5A CN201410593082A CN104315871B CN 104315871 B CN104315871 B CN 104315871B CN 201410593082 A CN201410593082 A CN 201410593082A CN 104315871 B CN104315871 B CN 104315871B
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molten salt
heat
blower fan
salt furnace
crystal system
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CN201410593082.5A
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CN104315871A (en
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李正华
施以军
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Anhui Jinhe Industrial Co Ltd
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Anhui Jinhe Industrial Co Ltd
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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
    • 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
    • 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
    • Y02P20/141—Feedstock
    • 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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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The present invention relates to the method that the outlet of molten salt furnace in Melamine Production smoke heat energy reclaims, comprise the following steps: a, after fused salt flue outlet, between before fused salt waste heat boiler, set up a heat-exchanger rig; B, the high-temperature flue gas that molten salt furnace is exported are introduced, and are used for heating from the next carbon dioxide heat exchange of carbon dioxide storage tank delivering to chuck shell and the valve clip sleeve pipe in crystal system with blower fan pressurization, export the import that loops back insulation blower fan. The present invention will greatly reduce the heat energy loss of fused salt carrier gas preheater, thereby has directly reduced the heat exhaustion of fused salt in cycle heat exchange process, and making molten salt furnace is that the bituminous coal that heating fused salt consumes measures effective decline. In the situation that increasing heat exchange area, also make the smog discharge temperature of molten salt furnace also obtain declining to a great extent, meet the technique needs of crystal system simultaneously, guarantee that crystal system technological parameter is stable.

Description

Molten salt furnace outlet smoke heat energy recovery method in Melamine Production
Technical field
The invention belongs to chemical production technical field, relate to molten salt furnace outlet smoke heat energy recovery method in Melamine Production.
Background technology
Melamine is a kind of important chemical industry intermediate products, can make melmac with formaldehyde condensation polymerization, can be used for plastics and coatings industry, also can do the anti-Zhe 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, the skin agent of tanning of moistureproof paper and grey leather, the bonding agent of synthesizing fireproof laminate, fixative or the curing agent etc. of waterproofing agent. Be 582 melmacs that raw material makes by melamine, formaldehyde, butanols. As the levelling agent of solvent borne polyurethane coating, effect spy is good. Also for synthetic tanning agent and the filler of making leather processing of organic and resin. Can make melmac with formaldehyde condensation polymerization, can be used for plastics and coatings industry, also can do the anti-Zhe of yarn fabric, anti-shrinking agent. Its modified resin can do lovely luster, the metallic paint that durable, hardness is good. The melmac that melamine and formaldehyde condensation polymerization are made is widely used in the manufacture and processing of Wood construction formwork. Can be used for the waterproof of template surface and the adhesion of block board, increase the number of times of reusing of template.
In Melamine Production in the past, because only having a waste heat boiler and air preheater, molten salt furnace back segment flue gas system carries out energy recovery, energy recovery effect in flue gas is poor, and air-introduced machine exit gas temperature is discharged from chimney 200 DEG C of left and right always. In the flue gas of flood tide, contain huge heat energy, it is directly thrown into and in atmosphere, has caused very large waste. And Melamine Production Zhong Hou workshop section's crystal system, because need outer insulation to keep apparatus body temperature more than 260 °, needs a large amount of steam to be incubated simultaneously, steam consumption is large.
Summary of the invention:
Object of the present invention is just to provide the method that the outlet of molten salt furnace in a kind of Melamine Production smoke heat energy reclaims, and has reduced chimney outlet temperature, has reduced system of crystallization blanket insurance temperature steam consumption again.
Technical scheme of the present invention is as follows:
The method that in Melamine Production, molten salt furnace outlet smoke heat energy reclaims, 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, the import of insulation blower fan 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 in the import of insulation blower fan by pipeline again;
B, utilize the high-temperature flue gas of 450 DEG C of molten salt furnace outlets, the CO 2 raw material gas of carbon dioxide storage tank being sent here by insulation blower fan heats, and CO 2 raw material gas is warmed up to the insulation jacket and the each technique valve that after 300 DEG C, are sent to crystal system;
After c, CO 2 raw material gas heat exchange, heat again to being incubated blower fan import by back of pipeline.
After carbon dioxide gas is pressurizeed by fan outlet, deliver to the chuck of crystal system through smoke-gas preheater, walk shell side. After heat exchange, being back to the import of heat exchange blower fan by return heats again. Preheater flue gas flow leaves shortcut, and middle mounted valve, for regulating the exhaust gas volumn size through preheater, is convenient to control the resistance adjusting of preheater outlet technique carrier gas temperature and molten salt furnace flue gas system. When the system pressure of insulation blower fan is regularly supplied unstripped gas from carbon dioxide storage tank when too low again. Gas forms a closed cycle, makes the constantly heat exchange of heat energy of flue outlet deliver to system heat energy is provided. Reduce flue temperature, recovery heat energy, the consumption of crystal system insulation steam reduced.
The present invention will greatly reduce the heat energy loss of fused salt carrier gas preheater, thereby has directly reduced the heat exhaustion of fused salt in cycle heat exchange process, and making molten salt furnace is that the bituminous coal that heating fused salt consumes measures effective decline. Meanwhile, in the situation that increasing heat exchange area, also make the smog discharge temperature of molten salt furnace also obtain declining to a great extent, meet the technique needs of crystal system simultaneously, guarantee that crystal system technological parameter is stable. Energy-saving effect is by fairly obvious.
Brief description of the drawings:
Fig. 1 is process flow diagram provided by the invention.
Specific implementation method
Example one:
As shown in Figure 1, the method that in a kind of Melamine Production provided by the invention, molten salt furnace outlet smoke heat energy reclaims, comprises following existing basic process steps:
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, the import of insulation blower fan 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 in the import of insulation blower fan by pipeline again.
Normal temperature carbon dioxide is sent into flue gas heat-exchange unit by being incubated fan outlet pressurization, 450 DEG C of effluent gas temperatures, after heat exchange, carbon dioxide gas temperature is 235 DEG C, the carbon dioxide after heating is delivered 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, 1.9 tons of steam savings per hour. After heat exchange, carbon dioxide is back to the import of heat exchange blower fan 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 technique carrier gas temperature and molten salt furnace flue gas system. In circulating-heating process, be incubated the system pressure of blower fan supplies from carbon dioxide storage tank when too low in good time.
Example two:
Existing basic process steps is with embodiment mono-,
The method of molten salt furnace exhaust pass gas energy recovery in the Melamine Production the present invention relates to, comprises the following steps:
Normal temperature carbon dioxide is sent into flue gas preheater by fan outlet pressurization, 453 DEG C of effluent gas temperatures, after heat exchange, carbon dioxide gas temperature is 238 DEG C, the carbon dioxide after heating is delivered 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, 2.1 tons of steam savings per hour. After heat exchange, being back to the import of heat exchange blower fan by return heats again. Regulate the exhaust gas volumn size through preheater by flue gas flow shortcut, control the resistance of preheater outlet technique carrier gas temperature and molten salt furnace flue gas system. In circulating-heating process, be incubated the system pressure of blower fan supplies from carbon dioxide storage tank when too low in good time.

Claims (2)

1. molten salt furnace outlet smoke heat energy recovery 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, the import of insulation blower fan 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 in the import of insulation blower fan by pipeline again;
B, insulation blower fan are delivered to the CO 2 raw material gas in carbon dioxide storage tank in flue gas heat-exchange unit, utilize the high-temperature flue gas of 450 DEG C of molten salt furnace outlets, CO 2 raw material gas are warmed up to the insulation jacket and the each technique valve that after 300 DEG C, are sent to crystal system;
C, in crystal system, after CO 2 raw material gas heat exchange, flow to insulation blower fan import by back of pipeline and heat again.
2. molten salt furnace outlet smoke heat energy recovery method in Melamine Production according to claim 1, is characterized in that: when the system pressure of insulation blower fan is during lower than setting value, more regularly supply CO 2 raw material gas from carbon dioxide storage tank.
CN201410593082.5A 2014-10-30 2014-10-30 Molten salt furnace outlet smoke heat energy recovery method in Melamine Production Active CN104315871B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

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