CN104292173A - Melamine crystallizer-based gas heat recovery method - Google Patents

Melamine crystallizer-based gas heat recovery method Download PDF

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Publication number
CN104292173A
CN104292173A CN201410451465.9A CN201410451465A CN104292173A CN 104292173 A CN104292173 A CN 104292173A CN 201410451465 A CN201410451465 A CN 201410451465A CN 104292173 A CN104292173 A CN 104292173A
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CN
China
Prior art keywords
gas
crystallizer
melamine
heat recovery
enter
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
CN201410451465.9A
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Chinese (zh)
Inventor
杨少忠
袁俊迎
冯尚武
岳万华
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 SHUNTIAN CHEMICAL GROUP CO Ltd
Original Assignee
SHANDONG SHUNTIAN CHEMICAL GROUP CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SHANDONG SHUNTIAN CHEMICAL GROUP CO Ltd filed Critical SHANDONG SHUNTIAN CHEMICAL GROUP CO Ltd
Priority to CN201410451465.9A priority Critical patent/CN104292173A/en
Publication of CN104292173A publication Critical patent/CN104292173A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C07D251/62—Purification of melamine
    • 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
    • Y02P20/50—Improvements relating to the production of bulk chemicals

Abstract

The invention discloses a melamine crystallizer-based gas heat recovery method. The method comprises the following steps: carrying out heat recovery before a 320DEG C high temperature reaction generation gas from a hot gas filter enters a crystallizer in order to cool the high temperature reaction gas from 320DEG C to about 270DEG C, allowing the 270DEG C high temperature reaction gas to enter the crystallizer, quenching by a 140DEG C cold gas entering from a lower portion to 210DEG C, allowing crystallized melamine to enter a melamine trap, and separating melamine. The method reduces about 30% of the 140DEG C cold gas entering the lower portion of the crystallizer, so the power consumption of a cold gas fan is reduced, and the technology has good economic benefit.

Description

A kind of gas heat recovery method based on melamine crystallizer
Technical field
The present invention relates to a kind of single stage method gas phase quenching method for producing melamine, particularly relate to a kind of method of melamine crystallizer entrance high-temperature reacting gas heat recuperation.
Background technology
Existing single stage method gas phase quenching preparation technology of melamine: generate gas from the pyroreaction of hot-air filter out 320 DEG C and directly enter the cold air that crystallizer and urine washes 140 DEG C of tower and carry out gas phase quenching, the temperature of gas mixture is made to be down to 210 DEG C, trimeric cyanamide crystallization also trips out crystallizer with mixed gas one and enters melamine collector, after isolating trimeric cyanamide, the mixed gas of 210 DEG C enters Cool gas blower.The gas of Cool gas blower outlet enters urine again and washes tower.The problem of this technique is, generates gas directly enter crystallizer from the pyroreaction of hot-air filter out 320 DEG C, be down to 210 DEG C need with the cold air quenching of 140 DEG C more than 3 times, such Cool gas blower power consumption will be very high.Reduce the power consumption of Cool gas blower, the amount of the cold air of 140 DEG C used of gas phase quenching in crystallizer will be reduced, also to consider that the pyroreaction of 320 DEG C generates gas and is being reduced to the crystallization situation in the process of 210 DEG C, just crystallization is started when being reduced to 265 DEG C because the pyroreactions of 320 DEG C generate gas, so the pyroreaction that will reclaim from 320 DEG C generates the net quantity of heat of gas when being reduced to 210 DEG C, need not consider now it is impossible by the cold air quenching of 140 DEG C more than 3 times completely, because it is very difficult for solving Crystallization Plugging in heat reclaim unit.Do not reclaim so there is partial heat always, the situation that Cool gas blower power consumption is high.
Summary of the invention
The object of the invention is the above problem for existing in prior art, a kind of processing method is provided, the character of crystallization is started when namely utilizing gaseous melamine to be cooled to 265 DEG C, generate before gas enters crystallizer by reclaiming heat the pyroreactions of 320 DEG C, leading cooling, enter crystallizer again, the cold air quenching to 210 DEG C of 140 DEG C that enter with bottom.
The object of the invention is to be achieved through the following technical solutions, the gas heat recovery method of this melamine crystallizer is: arrange a heat recovery technique generating before gas enters crystallizer from the pyroreaction of hot-air filter out 320 DEG C, utilize this heat recovery technique that high-temperature reacting gas is down to about 270 DEG C from 320 DEG C, then the high-temperature reacting gas of 270 DEG C enters crystallizer again, the cold air quenching to 210 DEG C of 140 DEG C that enter with bottom, enter melamine collector after trimeric cyanamide crystallization, isolate trimeric cyanamide.
Described heat recovery technique can be a kind of heat reclaim unit.
Beneficial effect of the present invention: owing to generating before gas enters crystallizer by reclaiming heat in the pyroreaction at 320 DEG C, leading cooling, enter crystallizer again, so both reclaimed high-temperature reacting gas is down to 270 DEG C partial heat from 320 DEG C, can produce higher than 45kg/cm 2the high pressure steam of high-quality, the cold air of 140 DEG C entering crystallizer bottom can also be made to reduce about 30%, reduce the power consumption of Cool gas blower, there is good economic benefit.
Accompanying drawing explanation
Embodiments of the invention are described in detail below in conjunction with accompanying drawing
Fig. 1 is artwork of the present invention.
Embodiment
As shown in Figure 1, the gas heat recovery method of this melamine crystallizer is: arrange a heat reclaim unit generating before gas enters crystallizer from the pyroreaction of hot-air filter out 320 DEG C, utilize this heat reclaim unit that high-temperature reacting gas is down to about 270 DEG C from 320 DEG C, then the high-temperature reacting gas of 270 DEG C enters crystallizer again, the cold air quenching to 210 DEG C of 140 DEG C that enter with bottom, enter melamine collector after trimeric cyanamide crystallization, isolate trimeric cyanamide.
For my company's 30,000 tons/year of single stage method gas phase quenching melamine preparation devices: be connected on crystallizer inlet duct by a heat-energy recovering apparatus, heat interchanging area about about 2500 squares, the pyroreaction of 320 DEG C generates gas and is about 45000NM 3/ h enters heat-energy recovering apparatus, and when going out heat-energy recovering apparatus, temperature is down to 270 DEG C, and liberated heat is used for producing the pressure of about 2t/h higher than 45kg/cm 2the steam of high-quality, when the high-temperature reacting gas of such 270 DEG C enters crystallizer again, need the cold air of gas phase quenching approximately to decrease about 28% of Cool gas blower rated discharge amount.

Claims (1)

1. the gas heat recovery method based on melamine crystallizer, it is characterized in that the method is: a heat recovery technique is set generating before gas enters crystallizer from the pyroreaction of hot-air filter out 320 DEG C, utilize this heat recovery technique that high-temperature reacting gas is down to about 270 DEG C from 320 DEG C, then the high-temperature reacting gas of 270 DEG C enters crystallizer again, the cold air quenching to 210 DEG C of 140 DEG C that enter with bottom, enter melamine collector after trimeric cyanamide crystallization, isolate trimeric cyanamide.
CN201410451465.9A 2014-09-08 2014-09-08 Melamine crystallizer-based gas heat recovery method Pending CN104292173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410451465.9A CN104292173A (en) 2014-09-08 2014-09-08 Melamine crystallizer-based gas heat recovery method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410451465.9A CN104292173A (en) 2014-09-08 2014-09-08 Melamine crystallizer-based gas heat recovery method

Publications (1)

Publication Number Publication Date
CN104292173A true CN104292173A (en) 2015-01-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410451465.9A Pending CN104292173A (en) 2014-09-08 2014-09-08 Melamine crystallizer-based gas heat recovery method

Country Status (1)

Country Link
CN (1) CN104292173A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107311951A (en) * 2017-05-24 2017-11-03 李鑫 A kind of melamine slow cooling crystallizes production method
CN108373454A (en) * 2018-04-08 2018-08-07 山东鸿运工程设计有限公司 A kind of melamine preparation device and production technology
CN108465288A (en) * 2018-05-07 2018-08-31 河南省中原大化集团有限责任公司 Heat energy exchange device and application process between a kind of material
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973948A (en) * 2010-09-11 2011-02-16 山东省舜天化工集团有限公司 Method for producing melamine
CN203577362U (en) * 2013-12-10 2014-05-07 成都天化化工工程技术有限公司 Energy-saving type crystallizer used for melamine device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973948A (en) * 2010-09-11 2011-02-16 山东省舜天化工集团有限公司 Method for producing melamine
CN203577362U (en) * 2013-12-10 2014-05-07 成都天化化工工程技术有限公司 Energy-saving type crystallizer used for melamine device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107311951A (en) * 2017-05-24 2017-11-03 李鑫 A kind of melamine slow cooling crystallizes production method
CN108373454A (en) * 2018-04-08 2018-08-07 山东鸿运工程设计有限公司 A kind of melamine preparation device and production technology
CN108373454B (en) * 2018-04-08 2023-07-25 山东鸿运工程设计有限公司 Melamine production device and production process
CN108465288A (en) * 2018-05-07 2018-08-31 河南省中原大化集团有限责任公司 Heat energy exchange device and application process between a kind of material
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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Application publication date: 20150121