CN105423323B - For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork - Google Patents
For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork Download PDFInfo
- Publication number
- CN105423323B CN105423323B CN201510977848.4A CN201510977848A CN105423323B CN 105423323 B CN105423323 B CN 105423323B CN 201510977848 A CN201510977848 A CN 201510977848A CN 105423323 B CN105423323 B CN 105423323B
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- Prior art keywords
- flue gas
- heat
- exchange unit
- gas heat
- type flue
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Classifications
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- 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
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- 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
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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
- 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
For the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork.Existing heat exchanger outside electrical heating or extraction inner flue gas of the stove to stove by heat exchanger using being exchanged heat, and smoke wind pipe arrangement is complicated, arrangement is relatively difficult, and cost is also higher.The composition of the present invention includes：Cold-air duct（1）, the cold-air duct and regulating valve（2）Connection, the regulating valve and surface-type flue gas heat-exchange unit（3）Connection, the surface-type flue gas heat-exchange unit and shut-off valve（4）Connection, the shut-off valve and thermocouple（5）Connection, the thermocouple and hot-air duct（6）Connection.The present invention is used for the surface-type flue gas heat-exchange unit and its heat-exchange method of back-end ductwork.
Description
Technical field：
The present invention relates to a kind of surface-type flue gas heat-exchange units and its heat-exchange method for back-end ductwork.
Background technology：
Station boiler existing urea pyrolysis system is both needed to hot wind at present, decomposes urea by hot wind, and then needed for manufacture
Ammonia.The hot wind of conventional urea pyrolysis system generally heats cold wind by electric heating system, as power plant in recent years is to station-service
The shortcomings that control of electric rate is more and more stringenter, and electrical heating power consumption is big is taken seriously, and to reduce power consumption, some engineerings are using extraction
High-temperature flue gas in boiler, the heat exchanger heating cold wind being connected to outside stove, the method connecting pipe is more, causes pipe arrangement very multiple
It is miscellaneous, while heater takes up a large area, it has not been convenient to it arranges, cost is also very high.
The content of the invention：
The object of the present invention is to provide a kind of surface-type flue gas heat-exchange units and its heat-exchange method for back-end ductwork.
Above-mentioned purpose is realized by following technical scheme：
A kind of surface-type flue gas heat-exchange unit for back-end ductwork, composition include：Cold-air duct, the cold air
Pipeline is connected with regulating valve, and the regulating valve is connected with surface-type flue gas heat-exchange unit, the surface-type flue gas heat-exchange unit with
Shut-off valve connects, and the shut-off valve is connected with thermocouple, and the thermocouple is connected with hot-air duct.
The surface-type flue gas heat-exchange unit for back-end ductwork, the surface-type flue gas heat-exchange unit are arranged in boiler
Back-end ductwork at.
A kind of heat-exchange method of the surface-type flue gas heat-exchange unit for back-end ductwork, this method include following step
Suddenly：
Under boiler maximum continuous rating, temperature is 20 DEG C, and flow is in 3500NM3The cold wind of/h, passes through cold air pipe
Road in the case where control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, is opened
Shut-off valve, cold wind after heat exchange are mixed with the ammonia of generation by hot-air duct, subsequently into denitrification apparatus, with flue gas
Reaction, achievees the purpose that denitration, while thermocouple is set before hot-air duct, adjusts the temperature of surface-type flue gas heat-exchange unit outlet
Degree；
At low load, required cold wind is few, while required hot blast temperature is low, and temperature is 20 DEG C, and flow exists
2700NM3The cold wind of/h by cold-air duct, in control valve opening in the case of 60%, passes through surface-type flue gas heat exchange
Device, when outlet temperature reaches 500 DEG C or so, opening shut-off valve, the cold wind after heat exchange is by hot-air duct, the ammonia with generation
Mixing, subsequently into denitrification apparatus, with smoke reaction, achievees the purpose that denitration.
Beneficial effects of the present invention：
1st, surface-type smoke heat exchanger system of the present invention does not use traditional electrical heating or extracts outside inner flue gas of the stove to stove
Mode, and by the way that surface-type flue gas heat-exchange unit is arranged in back-end ductwork, boiler platform space need not be occupied, is more saved empty
Between, it is directly exchanged heat by boiler tail flue gas with cold air in surface-type flue gas heat-exchange unit, reaches and meet the needs of heating cold wind,
Heating effect more preferably, need to only arrange air passage outside stove, pipe arrangement is simple, small investment, and operation is easy to operate, has good economy
Property, adaptability and market potential, it is highly practical, there is good development prospect.
, the present invention is by the way that in surface-type heat exchanger and furnace high-temperature flue gas heat exchange, heat transfer effect is more preferable, while can ensure
Continuous hot blast rate can prevent traditional mode of heating from being broken down due to heater power-off and flue gas ejector and being caused to be pyrolyzed
Device cannot come into operation, and influence denitrating system devoting rate, improve the reliability of urea pyrolysis system.
, the present invention by the regulating valve of entrance, the cold wind stream by surface-type heat exchanger can be adjusted according under different load
Amount, and then adjust the temperature of cold wind outlet adapts to boiler different load urea pyrolysis and puts into operation the temperature of hot wind demand, the method for operation
Relatively flexibly.
, for the relatively entire boiler thermodynamic system of the present invention, caloric receptivity is smaller, to the thermal balance of entire steam generator system without shadow
It rings.
Description of the drawings：
Attached drawing 1 is the structure diagram of the present invention.
Specific embodiment：
Embodiment 1：
A kind of surface-type flue gas heat-exchange unit for back-end ductwork, composition include：Cold-air duct 1, it is characterized in that：Institute
The cold-air duct stated is connected with regulating valve 2, and the regulating valve is connected with surface-type flue gas heat-exchange unit 3, the surface-type
Flue gas heat-exchange unit is connected with shut-off valve 4, and the shut-off valve is connected with thermocouple 5, and the thermocouple connects with hot-air duct 6
It connects.
Embodiment 2：
The surface-type flue gas heat-exchange unit for back-end ductwork according to embodiment 1, the surface-type flue gas heat exchange
Device is arranged at the back-end ductwork of boiler.
Embodiment 3：
A kind of heat-exchange method of the surface-type flue gas heat-exchange unit for back-end ductwork described in embodiment 1 or 2, this method bag
Include following steps：
Under boiler maximum continuous rating, temperature is 20 DEG C, and flow is in 3500NM3The cold wind of/h, passes through cold air pipe
Road in the case where control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, is opened
Shut-off valve, cold wind after heat exchange are mixed with the ammonia of generation by hot-air duct, subsequently into denitrification apparatus, with flue gas
Reaction, achievees the purpose that denitration, while thermocouple is set before hot-air duct, adjusts the temperature of surface-type flue gas heat-exchange unit outlet
Degree；
At low load, required cold wind is few, while required hot blast temperature is low, and temperature is 20 DEG C, and flow exists
2700NM3The cold wind of/h by cold-air duct, in control valve opening in the case of 60%, passes through surface-type flue gas heat exchange
Device, when outlet temperature reaches 500 DEG C or so, opening shut-off valve, the cold wind after heat exchange is by hot-air duct, the ammonia with generation
Mixing, subsequently into denitrification apparatus, with smoke reaction, achievees the purpose that denitration.
Claims (1)
1. a kind of heat-exchange method of surface-type flue gas heat-exchange unit for back-end ductwork, it is characterized in that：Described is used for afterbody cigarette
The surface-type flue gas heat-exchange unit composition in road includes cold-air duct, and the cold-air duct is connected with regulating valve, the tune
Section valve be connected with surface-type flue gas heat-exchange unit, the surface-type flue gas heat-exchange unit is connected with shut-off valve, the shut-off valve and
Thermocouple connects, and the thermocouple is connected with hot-air duct；The surface-type flue gas heat-exchange unit is arranged in the tail of boiler
At portion's flue；
This method comprises the following steps：
According under different load, by the regulating valve, the cold flow by surface-type heat exchanger is adjusted, and then is adjusted cold
The temperature of wind outlet, adapts to boiler different load urea pyrolysis and puts into operation the temperature of hot wind demand, and the method for operation is relatively flexible；
Under boiler maximum continuous rating, temperature is 20 DEG C, flow is in 3500 NM3The cold wind of/h, by cold-air duct,
In the case where control valve opening is 85%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 600 DEG C, open and close
Disconnected valve, cold wind after heat exchange are mixed with the ammonia of generation by hot-air duct, anti-with flue gas subsequently into denitrification apparatus
Should, achieve the purpose that denitration, while thermocouple is set before hot-air duct, adjust the temperature of surface-type flue gas heat-exchange unit outlet
Degree；
At low load, temperature is 20 DEG C, flow is in 2700NM3The cold wind of/h by cold-air duct, exists in control valve opening
In the case of 60%, by surface-type flue gas heat-exchange unit, when outlet temperature reaches 500 DEG C, shut-off valve, the cold wind after heat exchange are opened
It by hot-air duct, is mixed with the ammonia of generation, subsequently into denitrification apparatus, with smoke reaction, achievees the purpose that 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 CN105423323A (en) | 2016-03-23 |
| CN105423323B true CN105423323B (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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) |
Families Citing this family (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 |
Family Cites Families (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 |
| CN104208995B (en) * | 2014-09-05 | 2016-08-24 | 中电投科学技术研究院有限公司 | A kind of thermal device improving boiler wet method desulfurization neat stress temperature and method |
| 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 |
| CN104896495B (en) * | 2015-06-10 | 2017-04-12 | 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 |
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- 2015-12-23 CN CN201510977848.4A patent/CN105423323B/en active Active
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