CN105423323A - Surface type gas-gas heater for tail flue and heat exchange method thereof - Google Patents
Surface type gas-gas heater for tail flue and heat exchange method thereof Download PDFInfo
- Publication number
- CN105423323A CN105423323A CN201510977848.4A CN201510977848A CN105423323A CN 105423323 A CN105423323 A CN 105423323A CN 201510977848 A CN201510977848 A CN 201510977848A CN 105423323 A CN105423323 A CN 105423323A
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- CN
- China
- Prior art keywords
- flue gas
- exchange unit
- gas heat
- type flue
- air duct
- 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.)
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Classifications
-
- 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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
Abstract
Disclosed are a surface type gas-gas heater for a tail flue and a heat exchange method thereof. All existing heat exchangers adopt electrical heating or flue gas in furnaces is sucked to outside of the furnaces for heat exchange through the heat exchangers, the arrangement of flue gas and air pipelines is complicated and difficult, and the cost is high. The surface type gas-gas heater comprises a cold air pipeline (1); the cold air pipeline is connected with an adjusting valve (2); the adjusting valve is connected with a surface type gas-gas heater body (3); the surface type gas-gas heater body is connected with a shut-off valve (4); the shut-off valve is connected with a thermocouple (5); the thermocouple is connected with a hot air pipeline (6).
Description
technical field:
the present invention relates to a kind of surface-type flue gas heat-exchange unit for back-end ductwork and heat-exchange method thereof.
background technology:
current station boiler existing urea pyrolysis system all needs hot blast, makes urea decomposition by hot blast, and then the ammonia needed for manufacturing.The hot blast of conventional urea pyrolysis system generally heats cold wind by electric heating system, along with the control of power plant to station service power consumption rate is in recent years more and more stricter, the shortcoming that electrical heating power consumption is large comes into one's own, and for reducing power consumption, some engineering adopts and extracts high-temperature flue gas in boiler, be connected to the heat exchanger heating cold wind outside stove, the method connecting pipe is many, causes pipe arrangement very complicated, and the floor space of heater is large simultaneously, be inconvenient to arrange, cost is also very high.
summary of the invention:
the object of this invention is to provide a kind of surface-type flue gas heat-exchange unit for back-end ductwork and heat-exchange method thereof.
above-mentioned object is realized by following technical scheme:
a kind of surface-type flue gas heat-exchange unit for back-end ductwork, its composition comprises: cold-air duct, described cold-air duct is connected with control valve, described control valve is connected with surface-type flue gas heat-exchange unit, described surface-type flue gas heat-exchange unit is connected with shut-off valve, described shut-off valve is connected with thermocouple, and described thermocouple is connected with hot-air duct.
the described surface-type flue gas heat-exchange unit for back-end ductwork, described surface-type flue gas heat-exchange unit is arranged in the back-end ductwork place of boiler.
a heat-exchange method for the described surface-type flue gas heat-exchange unit for back-end ductwork, the method comprises the steps:
under boiler maximum continuous rating, temperature is 20 DEG C, and flow is at 3500NM
3
the cold wind of/h, by cold-air duct, when control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, open shut-off valve, the cold wind after heat exchange passes through hot-air duct, mix with the ammonia produced, then enter in denitrification apparatus, with smoke reaction, reach the object of denitration, thermocouple is set before hot-air duct simultaneously, regulates the temperature of surface-type flue gas heat-exchange unit outlet;
at low load, required cold wind is few, and the hot blast temperature is simultaneously low, and temperature is 20 DEG C, and flow is at 2700NM
3
the cold wind of/h, pass through cold-air duct, at control valve opening 60%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches about 500 DEG C, open shut-off valve, cold wind after heat exchange, by hot-air duct, mixes with the ammonia produced, then enters in denitrification apparatus, with smoke reaction, reach the object of denitration.
beneficial effect of the present invention:
1, surface-type smoke heat exchanger system of the present invention does not adopt traditional electrical heating or extracts inner flue gas of the stove to the mode outside stove, and by surface-type flue gas heat-exchange unit being arranged in back-end ductwork, do not need to take boiler platform space, more save space, by boiler tail flue gas directly and cold air heat exchange in surface-type flue gas heat-exchange unit, reach the demand meeting heating cold wind, heating effect is better, stove is outer only need arrange air channel, pipe arrangement is simple, small investment, operation is convenient, there is good economy, adaptability and market potential, practical, there is good development prospect.
, the present invention is by surface-type heat exchanger and furnace high-temperature flue gas heat exchange, heat transfer effect is better, continuous print hot blast rate can be ensured simultaneously, can prevent traditional mode of heating from causing pyrolysis installation not come into operation because heater power-off and flue gas ejector break down, affect denitrating system devoting rate, improve the reliability of urea pyrolysis system.
, the present invention according under different load, by the control valve of entrance, can regulate the cold flow through surface-type heat exchanger, and then regulates the temperature of cold wind outlet, adapt to boiler different load urea pyrolysis and to put into operation the temperature of hot blast demand, the method for operation is relatively flexible.
, the relatively whole boiler thermodynamic system of the present invention, recept the caloric less, on the thermal balance of whole steam generator system without impact.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
detailed description of the invention:
embodiment 1:
a kind of surface-type flue gas heat-exchange unit for back-end ductwork, its composition comprises: cold-air duct 1, it is characterized in that: described cold-air duct is connected with control valve 2, described control valve is connected with surface-type flue gas heat-exchange unit 3, described surface-type flue gas heat-exchange unit is connected with shut-off valve 4, described shut-off valve is connected with thermocouple 5, and described thermocouple is connected with hot-air duct 6.
embodiment 2:
the surface-type flue gas heat-exchange unit for back-end ductwork according to embodiment 1, described surface-type flue gas heat-exchange unit is arranged in the back-end ductwork place of boiler.
embodiment 3:
a heat-exchange method for the surface-type flue gas heat-exchange unit for back-end ductwork described in embodiment 1 or 2, the method comprises the steps:
under boiler maximum continuous rating, temperature is 20 DEG C, and flow is at 3500NM
3
the cold wind of/h, by cold-air duct, when control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, open shut-off valve, the cold wind after heat exchange passes through hot-air duct, mix with the ammonia produced, then enter in denitrification apparatus, with smoke reaction, reach the object of denitration, thermocouple is set before hot-air duct simultaneously, regulates the temperature of surface-type flue gas heat-exchange unit outlet;
at low load, required cold wind is few, and the hot blast temperature is simultaneously low, and temperature is 20 DEG C, and flow is at 2700NM
3
the cold wind of/h, pass through cold-air duct, at control valve opening 60%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches about 500 DEG C, open shut-off valve, cold wind after heat exchange, by hot-air duct, mixes with the ammonia produced, then enters in denitrification apparatus, with smoke reaction, reach the object of denitration.
Claims (3)
1. the surface-type flue gas heat-exchange unit for back-end ductwork, its composition comprises: cold-air duct, it is characterized in that: described cold-air duct is connected with control valve, described control valve is connected with surface-type flue gas heat-exchange unit, described surface-type flue gas heat-exchange unit is connected with shut-off valve, described shut-off valve is connected with thermocouple, and described thermocouple is connected with hot-air duct.
2. the surface-type flue gas heat-exchange unit for back-end ductwork according to claim 1, is characterized in that: described surface-type flue gas heat-exchange unit is arranged in the back-end ductwork place of boiler.
3. utilize a heat-exchange method for the surface-type flue gas heat-exchange unit for back-end ductwork described in claim 1 or 2, it is characterized in that: the method comprises the steps:
Under boiler maximum continuous rating, temperature is 20 DEG C, and flow is at 3500NM
3the cold wind of/h, by cold-air duct, when control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, open shut-off valve, the cold wind after heat exchange passes through hot-air duct, mix with the ammonia produced, then enter in denitrification apparatus, with smoke reaction, reach the object of denitration, thermocouple is set before hot-air duct simultaneously, regulates the temperature of surface-type flue gas heat-exchange unit outlet;
At low load, required cold wind is few, and the hot blast temperature is simultaneously low, and temperature is 20 DEG C, and flow is at 2700NM
3the cold wind of/h, pass through cold-air duct, at control valve opening 60%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches about 500 DEG C, open shut-off valve, cold wind after heat exchange, by hot-air duct, mixes with the ammonia produced, then enters in denitrification apparatus, with smoke reaction, reach the object of denitration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510977848.4A CN105423323B (en) | 2015-12-23 | 2015-12-23 | For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510977848.4A CN105423323B (en) | 2015-12-23 | 2015-12-23 | For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105423323A true CN105423323A (en) | 2016-03-23 |
| CN105423323B CN105423323B (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510977848.4A Active CN105423323B (en) | 2015-12-23 | 2015-12-23 | For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork |
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| CN (1) | CN105423323B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370034A (en) * | 2016-08-30 | 2017-02-01 | 哈尔滨锅炉厂有限责任公司 | Flue gas heat exchange system for urea pyrolysis |
| CN111420554A (en) * | 2020-04-20 | 2020-07-17 | 国家电投集团电站运营技术（北京）有限公司 | SCR denitration device and denitration control method for coal-fired boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102614758A (en) * | 2012-04-20 | 2012-08-01 | 湖南安普诺环保科技有限公司 | Urea-solution-based SCR (selective catalytic reduction) flue gas denitration process and device |
| CN104208995A (en) * | 2014-09-05 | 2014-12-17 | 中电投科学技术研究院有限公司 | Thermal device and method for increasing temperature of clean boiler smoke obtained by wet desulphurization |
| CN204220031U (en) * | 2014-10-23 | 2015-03-25 | 北京洛卡环保技术有限公司 | A kind of system simultaneously realizing multiple stage denitration of boiler smoke |
| CN104896495A (en) * | 2015-06-10 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
| CN205299570U (en) * | 2015-12-23 | 2016-06-08 | 哈尔滨锅炉厂有限责任公司 | A surperficial formula gas gas heater for afterbody flue |
-
2015
- 2015-12-23 CN CN201510977848.4A patent/CN105423323B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102614758A (en) * | 2012-04-20 | 2012-08-01 | 湖南安普诺环保科技有限公司 | Urea-solution-based SCR (selective catalytic reduction) flue gas denitration process and device |
| CN104208995A (en) * | 2014-09-05 | 2014-12-17 | 中电投科学技术研究院有限公司 | Thermal device and method for increasing temperature of clean boiler smoke obtained by wet desulphurization |
| CN204220031U (en) * | 2014-10-23 | 2015-03-25 | 北京洛卡环保技术有限公司 | A kind of system simultaneously realizing multiple stage denitration of boiler smoke |
| CN104896495A (en) * | 2015-06-10 | 2015-09-09 | 东方电气集团东方锅炉股份有限公司 | In-boiler flue gas heat exchange heat system providing urea pyrolysis heat source |
| CN205299570U (en) * | 2015-12-23 | 2016-06-08 | 哈尔滨锅炉厂有限责任公司 | A surperficial formula gas gas heater for afterbody flue |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370034A (en) * | 2016-08-30 | 2017-02-01 | 哈尔滨锅炉厂有限责任公司 | Flue gas heat exchange system for urea pyrolysis |
| CN111420554A (en) * | 2020-04-20 | 2020-07-17 | 国家电投集团电站运营技术（北京）有限公司 | SCR denitration device and denitration control method for coal-fired boiler |
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| Publication number | Publication date |
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| CN105423323B (en) | 2018-06-05 |
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