CN107816732A - A kind of air preheater cold end wall temperature adjusting means and method - Google Patents

A kind of air preheater cold end wall temperature adjusting means and method Download PDF

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Publication number
CN107816732A
CN107816732A CN201711012148.7A CN201711012148A CN107816732A CN 107816732 A CN107816732 A CN 107816732A CN 201711012148 A CN201711012148 A CN 201711012148A CN 107816732 A CN107816732 A CN 107816732A
Authority
CN
China
Prior art keywords
air
heat
exchange system
cold
wind
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
CN201711012148.7A
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Chinese (zh)
Inventor
马启磊
方军庭
张华磊
郑春茂
韩磊
李德
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.)
Datang Boiler Pressure Vessel Examination Center Co Ltd
China Datang Corp Science and Technology Research Institute Co Ltd East China Branch
Original Assignee
Datang Boiler Pressure Vessel Examination Center Co Ltd
China Datang Corp Science and Technology Research Institute Co Ltd East China Branch
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 Datang Boiler Pressure Vessel Examination Center Co Ltd, China Datang Corp Science and Technology Research Institute Co Ltd East China Branch filed Critical Datang Boiler Pressure Vessel Examination Center Co Ltd
Priority to CN201711012148.7A priority Critical patent/CN107816732A/en
Publication of CN107816732A publication Critical patent/CN107816732A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00Heating of air supplied for combustion
    • F23L15/04Arrangements of recuperators
    • F23L15/045Arrangements of recuperators using intermediate heat-transfer fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00Passages or apertures for delivering secondary air for completing combustion of fuel 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses a kind of air preheater cold end wall temperature adjusting means, including air preheater, First air heat-exchange system, Secondary Air heat-exchange system, cold a wind pipe, heat primary air pipeline, the First air heat-exchange system circulation is connected in cold a wind pipe and heat primary air pipeline, Secondary Air heat-exchange system is connected on heat primary air pipeline and cold secondary air duct, First air heat-exchange system and Secondary Air heat-exchange system are closed-loop water system, and the present invention also provides the adjusting method using the device.Beneficial effects of the present invention:Air preheater First air inlet temperature is improved, avoids depositing, blocking up ash and etching problem for fume side ammonium hydrogen sulfate;Improve Secondary Air temperature;Cold First air bypass is eliminated, air preheater heat exchange amount is improved, reduces exhaust gas temperature, improve boiler efficiency;All energy-conservation process is completed in boiler side, saves process clear and definite, and amount of energy saving calculates simple.

Description

A kind of air preheater cold end wall temperature adjusting means and method
Technical field
The present invention relates to a kind of air preheater wall temperature regulating system, more particularly to a kind of air preheater cold end wall temperature regulation dress Put and method.
Background technology
The cold end wall temperature that air preheater enters fume side is relatively low, is also easy to produce depositing, blocking up ash and etching problem for ammonium hydrogen sulfate;Together When air preheater outlet heat primary air temperature be higher than coal pulverizer inlet wind-warm syndrome permissible value, therefore the heat primary air needs for being sent into coal pulverizer add Entering cold First air hybrid cooling, the cold primary air flow of addition is more, and the heat exchange amount of air preheater reduces, exhaust gas temperature rise, Boiler thermal output reduces.
The dust stratification of air preheater fume side heat accumulating element is carried out using modes such as continuous soot blowing, high pressure water washings at present Processing;Can not solve the problems, such as the dust stratification of air preheater fume side heat accumulating element at all.Heat primary air is cooled down using condensate Heat exchange, heat primary air temperature is reduced, reduce cold primary air flow, increase air preheater heat exchange amount, reduce exhaust gas temperature, boiler hot Efficiency improves;Heat-setting water, which can squeeze partly to draw gas to be back in steam turbine, simultaneously continues expansion work, reduces turbine heat rate. Prior art is related to the energy-conservation of steam turbine, boiler simultaneously, and its energy-saving effect calculates complicated, unfavorable control.
The content of the invention
The technical problems to be solved by the invention are the provision of one kind and avoid stifled ash and etching problem, add air preheater Heat exchange amount, exhaust gas temperature is reduced, improve boiler thermal output, and the simple air preheater cold end wall temperature regulating system of process.
The present invention is that solve above-mentioned technical problem by the following technical programs:The present invention includes air preheater, once Wind heat-exchange system, Secondary Air heat-exchange system, a wind pipe, secondary air duct;The a wind pipe includes cold primary air piping Road, heat primary air pipeline, the cold a wind pipe be First air air inlet preheater before a wind pipe, heat primary air Pipeline is a wind pipe after air preheater;Secondary air duct includes cold secondary air duct, the cold secondary air channel Road is the secondary air duct before Secondary Air air inlet preheater, and First air heat-exchange system circulation is connected to cold First air On pipeline and heat primary air pipeline, Secondary Air heat-exchange system is connected on heat primary air pipeline and cold secondary air duct.
Preferably, the air preheater includes a wind cabin, secondary wind cabin;The cold a wind pipe connection First air Storehouse air inlet, heat primary air pipeline connect a wind cabin air outlet, the cold secondary air duct connecting secondary wind cabin air inlet.
Preferably, the First air heat-exchange system and Secondary Air heat-exchange system are closed-loop water system, comprising two Individual heat exchanger, the circulating water pipe being connected between two heat exchangers, two water circulating pumps being arranged on circulating water pipe;First air Two heat exchangers of heat-exchange system are placed in cold a wind pipe and heat primary air pipeline, two heat exchange of Secondary Air heat-exchange system Device is placed in cold secondary air duct and heat primary air pipeline.
Preferably, the heat exchanger is air-water heat exchanger.
Preferably, the water circulating pump is variable frequency pump.
Preferably, according to the trend of heat primary air, the changing installed in heat primary air pipeline last time wind heat-exchange system Hot device is preceding, and the heat exchanger of Secondary Air heat-exchange system is rear on heat primary air pipeline.
Preferably, in addition to water supply tank, the equal pipeline of water supply tank connect First air heat-exchange system and Secondary Air heat exchange system The circulating water pipe of system.
Preferably, include the motor-driven valve of two control water supply tank refill flows, be separately mounted to water supply tank connection First air On the circulating water pipe of heat-exchange system and Secondary Air heat-exchange system.
The present invention also provides a kind of air preheater cold end wall temperature adjusting method, and the step is as follows:
(1) ON cycle water pump, circulate closed circle water system;
(2) by the First air from blower fan after heat exchanger, it is sent into a wind cabin of air preheater;
(3) by the Secondary Air from blower fan after heat exchanger, it is sent into the secondary wind cabin of air preheater;
(4) after the First air after exchanging heat and Secondary Air reach required temperature, the First air after heat exchange is sent into coal-grinding Machine, the Secondary Air after heat exchange are sent into secondary air box;
(5) in either step above, opens solenoid valve, refill flow is adjusted.
The present invention has advantages below compared with prior art:
1st, the cold First air of heat primary air waste-heat is absorbed by closed cycle water, improves wind inlet temperature of air preheater Degree, the heat accumulating element temperature that air preheater enters fume side is improved, avoid the depositing of fume side ammonium hydrogen sulfate, stifled ash and corrosion from asking Topic.
2nd, the cold Secondary Air of heat primary air waste-heat is absorbed by closed cycle water, improves Secondary Air temperature.
3rd, cold First air bypass is eliminated, air preheater heat exchange amount is improved, reduces exhaust gas temperature, improve boiler efficiency.
4th, all energy-conservation process is completed in boiler side, is not related to steam turbine side, saves process clear and definite, and amount of energy saving calculates Simply.
Brief description of the drawings
Fig. 1 is a kind of structural representation of air preheater cold end wall temperature adjusting means of the present invention.
Air preheater 1, wind cabin 11, secondary wind cabin 12, a wind pipe 2, cold a wind pipe 21, a heat primary air Pipeline 22, secondary air duct 3, cold secondary air duct 31, heat exchanger 4, circulating water pipe 5, water circulating pump 51, water supply tank 6, electrically-controlled valve 7
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation Example.
As shown in figure 1, the present embodiment includes air preheater 1, First air heat-exchange system, Secondary Air heat-exchange system, once Wind pipeline 2, secondary air duct 3;The a wind pipe 2 include cold a wind pipe 21, heat primary air pipeline 22, described cold one Secondary wind pipeline 21 is a wind pipe 2 before First air air inlet preheater 1, and heat primary air pipeline 22 is by air preheat A wind pipe 2 after device 1;Secondary air duct 3 includes cold secondary air duct 31, and the cold secondary air duct 31 is entered for Secondary Air Enter the secondary air duct 3 before air preheater 1, and First air heat-exchange system circulation is connected to cold a wind pipe 21 and heat In a wind pipe 22, Secondary Air heat-exchange system is connected on heat primary air pipeline 22 and cold secondary air duct 31.
The air preheater 1 includes a wind cabin 11, secondary wind cabin 12;The cold a wind pipe 21 connects First air The air inlet of storehouse 11, heat primary air pipeline 22 connect an air outlet of wind cabin 11, the cold connecting secondary wind cabin of secondary air duct 31 12 air inlets.The First air heat-exchange system and Secondary Air heat-exchange system are closed-loop water system, comprising two heat exchange Device 4, the heat exchanger 4 are air-water heat exchanger, are connected to the circulating water pipe 5 between two heat exchangers 4, are arranged on circulating water pipe 5 On two water circulating pumps 51, the water circulating pump 51 is variable frequency pump;Two heat exchangers 4 of First air heat-exchange system are placed in Cold a wind pipe 21 and heat primary air pipeline 22, two heat exchangers of Secondary Air heat-exchange system are placed in cold secondary air duct 31 With heat primary air pipeline 22.
According to the trend of heat primary air, the heat exchanger 4 installed in the last wind heat-exchange system of heat primary air pipeline 22 Preceding, the heat exchanger 4 of Secondary Air heat-exchange system is rear on heat primary air pipeline 22.
Also include water supply tank 6,6 equal pipeline of the water supply tank connection First air heat-exchange system and Secondary Air heat-exchange system follow Ring water pipe 5.Include the motor-driven valve 7 of two control refill flows of water supply tank 6, be separately mounted to water supply tank 6 and connect First air heat exchange On the circulating water pipe 5 of system and Secondary Air heat-exchange system.
The present invention also provides a kind of air preheater cold end wall temperature adjusting method, and the step is as follows:
(1) ON cycle water pump 5, circulate closed circle water system;
(2) by the First air from blower fan after heat exchanger, it is sent into a wind cabin 11 of air preheater 1;
(3) by the Secondary Air from blower fan after heat exchanger, it is sent into the secondary wind cabin 12 of air preheater 1;
(4) after the First air after exchanging heat and Secondary Air reach required temperature, the First air after heat exchange is sent into coal-grinding Machine, the Secondary Air after heat exchange are sent into secondary air box;
(5) in either step above, opens solenoid valve 7, refill flow is adjusted.
Air preheater realizes the heat exchange of flue gas and air, for heating the First air and Secondary Air that are entered by air preheater import.
Air-water heat exchanger is installed in heat primary air pipeline 22, cold a wind pipe 21, cold secondary air duct 31, in heat Two closed cycle water heat exchange circuits are formed between First air and cold First air, heat primary air and cold Secondary Air, absorb heat respectively First air waste heat heats cold First air, cold Secondary Air.
Water pipe is installed additional in two closed cycle water lines, and water supply tank 6 is controlled to closed cycle water pipe by motor-driven valve 7 The moisturizing on road.
Air preheater is absorbed by closed cycle water and exports heat primary air waste heat, heats air preheater import First air, two respectively Secondary wind, realization prevent the low-temperature corrosion of air preheater fume side and block up ash, reduction exhaust gas temperature, improve boiler thermal output.According to Coal pulverizer inlet wind-warm syndrome determines that air preheater exports a wind-warm syndrome, adjusts both sides variable frequency pump control closed cycle water respectively to heat one Secondary wind caloric receptivity, ensures suitable wind-warm syndrome of coal pulverizer inlet with this.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.

Claims (9)

1. a kind of air preheater cold end wall temperature adjusting means, it is characterised in that including air preheater, First air heat-exchange system, two Secondary wind heat-exchange system, a wind pipe, secondary air duct;
The a wind pipe includes cold a wind pipe, heat primary air pipeline, and the cold a wind pipe enters for First air A wind pipe before air preheater, heat primary air pipeline are a wind pipe after air preheater;Secondary air channel Road includes cold secondary air duct, and the cold secondary air duct is the secondary air duct before Secondary Air air inlet preheater, and institute State the circulation of First air heat-exchange system to be connected in cold a wind pipe and heat primary air pipeline, Secondary Air heat-exchange system is connected to heat In a wind pipe and cold secondary air duct.
A kind of 2. air preheater cold end wall temperature adjusting means according to claim 1, it is characterised in that the air preheater Including a wind cabin, secondary wind cabin;The cold a wind pipe connects a wind cabin air inlet, and heat primary air pipeline connects once Wind cabin air outlet, the cold secondary air duct connecting secondary wind cabin air inlet.
A kind of 3. air preheater cold end wall temperature adjusting means according to claim 1, it is characterised in that the First air heat exchange System and Secondary Air heat-exchange system are closed-loop water system, comprising two heat exchangers, are connected between two heat exchangers Circulating water pipe, two water circulating pumps being arranged on circulating water pipe;Two heat exchangers of First air heat-exchange system are placed in cold A wind pipe and heat primary air pipeline, two heat exchangers of Secondary Air heat-exchange system are placed in cold secondary air duct and heat once Wind pipeline.
4. a kind of air preheater cold end wall temperature adjusting means according to claim 3, it is characterised in that the heat exchanger is Air-water heat exchanger.
5. a kind of air preheater cold end wall temperature adjusting means according to claim 3, it is characterised in that the water circulating pump is Variable frequency pump.
6. a kind of air preheater cold end wall temperature adjusting means according to claim 3, it is characterised in that according to heat primary air Trend, the heat exchanger installed in heat primary air pipeline last time wind heat-exchange system is preceding, on heat primary air pipeline The heat exchanger of Secondary Air heat-exchange system is rear.
A kind of 7. air preheater cold end wall temperature adjusting means according to claim 1, it is characterised in that also including water supply tank, The equal pipeline of water supply tank connects the circulating water pipe of First air heat-exchange system and Secondary Air heat-exchange system.
8. a kind of air preheater cold end wall temperature adjusting means according to claim 7, it is characterised in that mended including two controls The motor-driven valve of water tank refill flow, it is separately mounted to the circulation of water supply tank connection First air heat-exchange system and Secondary Air heat-exchange system On water pipe.
A kind of 9. method using air preheater cold end wall temperature adjusting means described in claim 1-8, it is characterised in that the step It is as follows:
(1) ON cycle water pump, circulate closed circle water system;
(2) by the First air from blower fan after heat exchanger, it is sent into a wind cabin of air preheater;
(3) by the Secondary Air from blower fan after heat exchanger, it is sent into the secondary wind cabin of air preheater;
(4) after the First air after exchanging heat and Secondary Air reach required temperature, the First air after heat exchange is sent into coal pulverizer, heat Secondary Air after exchange is sent into secondary air box;
(5) in either step above, opens solenoid valve, refill flow is adjusted.
CN201711012148.7A 2017-10-26 2017-10-26 A kind of air preheater cold end wall temperature adjusting means and method Pending CN107816732A (en)

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Application Number Priority Date Filing Date Title
CN201711012148.7A CN107816732A (en) 2017-10-26 2017-10-26 A kind of air preheater cold end wall temperature adjusting means and method

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Application Number Priority Date Filing Date Title
CN201711012148.7A CN107816732A (en) 2017-10-26 2017-10-26 A kind of air preheater cold end wall temperature adjusting means and method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578931A (en) * 2019-07-31 2019-12-17 西安航天源动力工程有限公司 System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater
CN113464971A (en) * 2021-08-12 2021-10-01 西安热工研究院有限公司 Air preheating system of garbage incinerator
CN116481293A (en) * 2023-03-30 2023-07-25 国家能源集团科学技术研究院有限公司 Boiler coal feeding quality-improving drying device and boiler coal feeding quality-improving system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151894A (en) * 1980-03-31 1981-11-25 Foster Wheeler Corp Heat exchanger apparatus
CN101050864A (en) * 2007-03-13 2007-10-10 西安热工研究院有限公司 Control method for low temperature corrosion blocking ash of coal burning boiler air preheater
CN102252339A (en) * 2011-05-12 2011-11-23 华北电力大学(保定) System for reducing discharge smoke temperature of power station boiler
CN204922939U (en) * 2015-06-24 2015-12-30 山东英电节能科技有限公司 Wind waste heat utilization equipment of heat with use of fan heater system linking
CN205079207U (en) * 2015-09-08 2016-03-09 嘉峪关大友嘉能化工有限公司 Boiler blower air -out passageway heating device
CN105972632A (en) * 2016-05-06 2016-09-28 华电电力科学研究院 System and process for protecting air preheater of coal-fired power plant from blockage and corrosion through hot-air counterflow
CN106402838A (en) * 2016-09-13 2017-02-15 上海理工大学 Tail flue gas waste heat utilizing system of utility boiler based on hot blast recycling

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151894A (en) * 1980-03-31 1981-11-25 Foster Wheeler Corp Heat exchanger apparatus
CN101050864A (en) * 2007-03-13 2007-10-10 西安热工研究院有限公司 Control method for low temperature corrosion blocking ash of coal burning boiler air preheater
CN102252339A (en) * 2011-05-12 2011-11-23 华北电力大学(保定) System for reducing discharge smoke temperature of power station boiler
CN204922939U (en) * 2015-06-24 2015-12-30 山东英电节能科技有限公司 Wind waste heat utilization equipment of heat with use of fan heater system linking
CN205079207U (en) * 2015-09-08 2016-03-09 嘉峪关大友嘉能化工有限公司 Boiler blower air -out passageway heating device
CN105972632A (en) * 2016-05-06 2016-09-28 华电电力科学研究院 System and process for protecting air preheater of coal-fired power plant from blockage and corrosion through hot-air counterflow
CN106402838A (en) * 2016-09-13 2017-02-15 上海理工大学 Tail flue gas waste heat utilizing system of utility boiler based on hot blast recycling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578931A (en) * 2019-07-31 2019-12-17 西安航天源动力工程有限公司 System and method for adjusting temperature of primary air and secondary air by utilizing condensed water to improve air heater
CN113464971A (en) * 2021-08-12 2021-10-01 西安热工研究院有限公司 Air preheating system of garbage incinerator
CN116481293A (en) * 2023-03-30 2023-07-25 国家能源集团科学技术研究院有限公司 Boiler coal feeding quality-improving drying device and boiler coal feeding quality-improving system

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Application publication date: 20180320