CN112999833A - Urea hydrolysis dilution wind denitration waste heat recovery device - Google Patents

Urea hydrolysis dilution wind denitration waste heat recovery device Download PDF

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Publication number
CN112999833A
CN112999833A CN201911306284.6A CN201911306284A CN112999833A CN 112999833 A CN112999833 A CN 112999833A CN 201911306284 A CN201911306284 A CN 201911306284A CN 112999833 A CN112999833 A CN 112999833A
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CN
China
Prior art keywords
air
flue gas
denitration
waste heat
dilution
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Pending
Application number
CN201911306284.6A
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Chinese (zh)
Inventor
高飞
杨春雨
白玉勇
罗莉
崔焕民
赵允涛
魏新
李雯
徐岩
佟园园
程高
孙健
蔡亚东
张崔灿
齐云方
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Publication date
Application filed by Datang Environment Industry Group Co Ltd filed Critical Datang Environment Industry Group Co Ltd
Priority to CN201911306284.6A priority Critical patent/CN112999833A/en
Publication of CN112999833A publication Critical patent/CN112999833A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/343—Heat recovery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention provides a urea hydrolysis dilution air denitration waste heat recovery device which comprises an air inlet, a flue gas heat exchanger and an ammonia-air mixer which are sequentially connected, wherein the air inlet of the ammonia-air mixer is communicated with a urea hydrolyzer, and the air outlet of the ammonia-air mixer is communicated with a denitration flue; the flue gas heat exchanger is arranged on the flue gas denitration device to recover flue gas waste heat of the flue gas denitration device. According to the invention, the waste heat of the flue gas denitration device is recycled by the flue gas heat exchanger, and the cold air or the air pumped by the dilution fan is heated to form the dilution air with the temperature of 160-180 ℃, so that the electric heating or the consumption of cold re-steam is not needed, and the effects of energy conservation and emission reduction are achieved. Moreover, the dust content of the air pumped by the cold air or the dilution fan is low, and the risk of dust accumulation and blockage of the pipeline is avoided.

Description

Urea hydrolysis dilution wind denitration waste heat recovery device
Technical Field
The invention relates to the technical field of urea hydrolysis devices, in particular to a urea hydrolysis dilution air denitration waste heat recovery device.
Background
At present, a urea hydrolyzer is used for hydrolyzing urea to generate ammonia mixed gas, and the mixed gas needs 160-180 ℃ dilution air to dilute the ammonia concentration to 5%. In the traditional technology, some air is used as dilution air, and the air is heated to 160-180 ℃ through electric heating or cold re-steam heat exchange to be used as the dilution air, wherein a heat source for heating the dilution air is from electric heating or cold re-steam, the former has higher power consumption, and the latter has higher high-quality steam consumption. Or hot primary air is used as dilution air, the ammonia air mixer is filled with the heat at about 300 ℃ for one time, the hot primary air is used as the dilution air, the hot primary air is selected as the dilution air, the power consumption is saved, but the dust content of the hot primary air is large, and the subsequent dust deposition of a pipeline is serious. Even the AIG pipeline is blocked, and the danger exists in the operation.
Disclosure of Invention
Therefore, an object of the present invention is to provide a urea hydrolysis dilution air denitration waste heat recovery device, which can recover waste heat of a flue gas denitration device, form dilution air of 160-.
The invention provides a urea hydrolysis dilution air denitration waste heat recovery device which comprises an air inlet, a flue gas heat exchanger and an ammonia-air mixer which are sequentially connected, wherein the air inlet of the ammonia-air mixer is communicated with a urea hydrolyzer, and the air outlet of the ammonia-air mixer is communicated with a denitration flue; the flue gas heat exchanger is arranged on the flue gas denitration device to recover flue gas waste heat of the flue gas denitration device. According to the invention, the waste heat of the flue gas denitration device is recycled by the flue gas heat exchanger, and the cold air or the air pumped by the dilution fan is heated to form the dilution air with the temperature of 160-180 ℃, so that the electric heating or the consumption of cold re-steam is not needed, and the effects of energy conservation and emission reduction are achieved. Moreover, the dust content of the air pumped by the cold air or the dilution fan is low, and the risk of dust accumulation and blockage of the pipeline is avoided.
Further, the flue gas heat exchanger is arranged at the tail of the flue of the economizer.
Further, the flue gas heat exchanger is arranged at the inlet position of the denitration flue.
Further, the flue gas heat exchanger is arranged at the outlet position of the denitration flue.
Further, the air inlet is connected with a dilution fan.
Further, the dilution fan has two.
Further, the air inlet is connected with a cold air source.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram showing a urea hydrolysis dilution air denitration waste heat recovery device;
FIG. 2 is a perspective view of another urea hydrolysis dilution air denitration waste heat recovery device;
fig. 3 shows a structure of a flue gas denitration apparatus.
In the drawings are labeled:
1 air inlet
2 flue gas heat exchanger
3 empty blender of ammonia
4 urea hydrolyzer
5 denitration flue
6 coal economizer
7 dilution fan
8 Cold air source
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The embodiment of the invention provides a urea hydrolysis dilution air denitration waste heat recovery device, which comprises an air inlet 1, a flue gas heat exchanger 2 and an ammonia-air mixer 3 which are sequentially connected, wherein the air inlet of the ammonia-air mixer 3 is communicated with a urea hydrolyzer 4, and the air outlet of the ammonia-air mixer 3 is communicated with a denitration flue 5 of a flue gas denitration device; the flue gas heat exchanger 2 is arranged on the flue gas denitration device to recover the flue gas waste heat of the flue gas denitration device. Optionally, the air inlet 1 is communicated with a dilution fan 7 or a cold air source 8. According to the invention, the flue gas heat exchanger 2 is used for recycling the waste heat of the flue gas denitration device, and the cold air or the air pumped by the dilution fan is heated to form the dilution air with the temperature of 160-180 ℃, so that the electric heating or the consumption of cold re-steam is not needed, and the effects of energy conservation and emission reduction are achieved. Moreover, the air pumped by the cold air or dilution fan has low dust content and no risk of dust accumulation and blockage of the pipeline.
In one aspect of the embodiment of the present invention, the flue gas heat exchanger 2 is disposed at the tail of the flue of the economizer 6 of the flue gas denitration device, and in addition, the flue gas heat exchanger 2 may also be disposed at an inlet position of the denitration flue 5 of the flue gas denitration device, or at an outlet position of the denitration flue 5 of the flue gas denitration device. It can be understood that, as shown in fig. 3, the flue gas heat exchanger 2 is disposed at the flue tail of the economizer 6 of the flue gas denitration device, the flue gas heat exchanger 2 is disposed at the inlet position of the denitration flue 5 of the flue gas denitration device, and the flue gas heat exchanger is disposed at the outlet position of the denitration flue 5 of the flue gas denitration device. The flue tail of the economizer 6 and the inlet and outlet positions of the denitration flue 5 are the positions where the waste heat of the flue gas is concentrated, and the flue gas heat exchangers 2 are arranged at the positions for waste heat recovery, so that the waste heat recovery efficiency is improved.
In one aspect of the embodiment of the present invention, the air inlet 1 is connected to a dilution fan 7, and preferably, the dilution fan 7 has two. In a specific embodiment, two dilution fans 7 are used for sucking air from the atmosphere, the air is sent to the flue gas heat exchanger 2 at the coal economizer 6 through the dilution fans 7, the dilution air with the temperature of about 160 ℃ after heat exchange is introduced into the ammonia-air mixer 3, and the dilution air is mixed with the ammonia gas generated by hydrolysis and then sprayed into the denitration flue 5.
In one aspect of the embodiment of the present invention, the air inlet 1 is connected to a cold air source 8. In a specific embodiment, two cold air sources are respectively taken before the air preheater, and the cold air is sent to the flue gas heat exchanger 2 at the coal economizer 6, forms dilution air with the temperature of about 160 ℃ after heat exchange, is introduced into the ammonia-air mixer 3, is mixed with ammonia gas generated by hydrolysis, and is sprayed into the denitration flue 5. In the embodiment, the air inlet of the air inlet 1 is changed from hot primary air to cold air before heat exchange, the cold air does not exchange heat through the air preheater, the dust content is low, the cold air is heated into diluted air through the flue gas heat exchanger 2 of the denitration outlet flue, the problem of dust deposition and blockage can not be caused, meanwhile, the electric energy and the steam consumption are saved, the flue gas waste heat is recycled, and the energy conservation and the consumption reduction are realized.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. The utility model provides a urea is hydrolysised and is diluted wind denitration waste heat recovery device which characterized in that includes:
the device comprises an air inlet, a flue gas heat exchanger and an ammonia-air mixer which are sequentially connected, wherein the air inlet of the ammonia-air mixer is communicated with a urea hydrolyzer, and the air outlet of the ammonia-air mixer is communicated with a denitration flue of a flue gas denitration device; the flue gas heat exchanger is arranged on the flue gas denitration device to recover flue gas waste heat of the flue gas denitration device.
2. The urea hydrolysis dilution air denitration waste heat recovery device of claim 1,
the flue gas heat exchanger is arranged at the tail part of a flue of an economizer of the flue gas denitration device.
3. The urea hydrolysis dilution air denitration waste heat recovery device of claim 1,
the flue gas heat exchanger is arranged at the inlet position of a denitration flue of the flue gas denitration device.
4. The urea hydrolysis dilution air denitration waste heat recovery device of claim 1,
the flue gas heat exchanger is arranged at the outlet position of a denitration flue of the flue gas denitration device.
5. The urea hydrolysis dilution air denitration waste heat recovery device of claim 1,
and the air inlet is connected with a dilution fan.
6. The urea hydrolysis dilution air denitration waste heat recovery device of claim 5,
the dilution fan has two.
7. The urea hydrolysis dilution air denitration waste heat recovery device of claim 1,
and the air inlet is connected with a cold air source.
CN201911306284.6A 2019-12-18 2019-12-18 Urea hydrolysis dilution wind denitration waste heat recovery device Pending CN112999833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911306284.6A CN112999833A (en) 2019-12-18 2019-12-18 Urea hydrolysis dilution wind denitration waste heat recovery device

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Application Number Priority Date Filing Date Title
CN201911306284.6A CN112999833A (en) 2019-12-18 2019-12-18 Urea hydrolysis dilution wind denitration waste heat recovery device

Publications (1)

Publication Number Publication Date
CN112999833A true CN112999833A (en) 2021-06-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114653198A (en) * 2022-02-14 2022-06-24 华能南通燃机发电有限公司 Flue gas denitration utilization device of gas turbine waste heat boiler

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276655A (en) * 1996-02-13 1997-10-28 Ebara Corp Treatment of exhaust gas containing high concentration ammonia and device therefor
JP2002068735A (en) * 2000-08-24 2002-03-08 Mitsubishi Heavy Ind Ltd Method for producing ammonia and method for treating exhaust gas
JP2004033876A (en) * 2002-07-02 2004-02-05 Mitsui Eng & Shipbuild Co Ltd Method of decomposing ureas in exhaust gas, and method and apparatus for treating exhaust gas
US20070212287A1 (en) * 2003-11-05 2007-09-13 Urea Casale S.A. Method for the Treatment of Combustion Flue Gas
CN103585867A (en) * 2013-11-26 2014-02-19 天津大学 Flue gas desulphurization and denitration method as well as its apparatus
US20150353370A1 (en) * 2014-06-09 2015-12-10 Wahlco, Inc. Urea to Ammonia Process
CN205925389U (en) * 2016-07-20 2017-02-08 大唐环境产业集团股份有限公司 Wind heating system is diluted in denitration
CN206577603U (en) * 2016-12-29 2017-10-24 大唐环境产业集团股份有限公司 A kind of denitration dilution wind heat-exchange system
CN107497297A (en) * 2016-12-29 2017-12-22 大唐环境产业集团股份有限公司 A kind of denitration dilution wind heat-exchange system
CN206973600U (en) * 2017-08-02 2018-02-06 苏州西热节能环保技术有限公司 A kind of smoke heat replacing device applied to SCR denitration hydrolysis of urea system
CN107894003A (en) * 2017-09-30 2018-04-10 北京中电联环保股份有限公司 Application of the gas-gas heat exchanger in SCR denitration mixed flow system
CN208406637U (en) * 2018-06-25 2019-01-22 浙江融智能源科技有限公司 A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276655A (en) * 1996-02-13 1997-10-28 Ebara Corp Treatment of exhaust gas containing high concentration ammonia and device therefor
JP2002068735A (en) * 2000-08-24 2002-03-08 Mitsubishi Heavy Ind Ltd Method for producing ammonia and method for treating exhaust gas
JP2004033876A (en) * 2002-07-02 2004-02-05 Mitsui Eng & Shipbuild Co Ltd Method of decomposing ureas in exhaust gas, and method and apparatus for treating exhaust gas
US20070212287A1 (en) * 2003-11-05 2007-09-13 Urea Casale S.A. Method for the Treatment of Combustion Flue Gas
CN103585867A (en) * 2013-11-26 2014-02-19 天津大学 Flue gas desulphurization and denitration method as well as its apparatus
US20150353370A1 (en) * 2014-06-09 2015-12-10 Wahlco, Inc. Urea to Ammonia Process
CN205925389U (en) * 2016-07-20 2017-02-08 大唐环境产业集团股份有限公司 Wind heating system is diluted in denitration
CN206577603U (en) * 2016-12-29 2017-10-24 大唐环境产业集团股份有限公司 A kind of denitration dilution wind heat-exchange system
CN107497297A (en) * 2016-12-29 2017-12-22 大唐环境产业集团股份有限公司 A kind of denitration dilution wind heat-exchange system
CN206973600U (en) * 2017-08-02 2018-02-06 苏州西热节能环保技术有限公司 A kind of smoke heat replacing device applied to SCR denitration hydrolysis of urea system
CN107894003A (en) * 2017-09-30 2018-04-10 北京中电联环保股份有限公司 Application of the gas-gas heat exchanger in SCR denitration mixed flow system
CN208406637U (en) * 2018-06-25 2019-01-22 浙江融智能源科技有限公司 A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114653198A (en) * 2022-02-14 2022-06-24 华能南通燃机发电有限公司 Flue gas denitration utilization device of gas turbine waste heat boiler

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Application publication date: 20210622