CN105526599A - Clean type coal-fired boiler smoke discharging waste heat quality improving using system - Google Patents

Clean type coal-fired boiler smoke discharging waste heat quality improving using system Download PDF

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Publication number
CN105526599A
CN105526599A CN201610053337.8A CN201610053337A CN105526599A CN 105526599 A CN105526599 A CN 105526599A CN 201610053337 A CN201610053337 A CN 201610053337A CN 105526599 A CN105526599 A CN 105526599A
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CN
China
Prior art keywords
air
bypass
heat
air preheater
primary air
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Granted
Application number
CN201610053337.8A
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Chinese (zh)
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CN105526599B (en
Inventor
孙杨
李惊涛
赵铁铮
任婷
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North China Electric Power University
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North China Electric Power University
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Publication of CN105526599B publication Critical patent/CN105526599B/en
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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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/36Water and air preheating systems
    • 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
    • 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

Abstract

The invention belongs to the technical field of design of power station energy-saving equipment, and particularly relates to a clean type coal-fired boiler smoke discharging waste heat quality improving using system. A hearth (10), a superheater (11), a reheater (12) and an economizer (13) are sequentially connected in a boiler; the economizer (13) is connected with an air pre-heater (1) through an air pre-heater inlet smoke flue (8); a primary air fan (2) is connected with the air pre-heater (1) through an air pre-heater inlet air flue (3), and an air pre-heater outlet air flue (4) is connected with the hearth through a primary flue (5) and a coal pulverizing system in sequence; a hot primary air bypass (6) is arranged on the air pre-heater outlet air flue (4), a bypass induced draft fan (7) is additionally arranged on the hot primary air bypass (6) to keep hot air pressing, and a bypass hot air heat exchanger set (14) connected with an energy supply cold source (15) is arranged on the hot primary air bypass (6); and an outlet of the hot primary air bypass (6) is connected into the air pre-heater inlet flue (3). By means of the clean type coal-fired boiler smoke discharging waste heat quality improving using system, the boiler smoke discharging waste heat is effectively used, and the energy using efficiency is improved.

Description

The upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system
Technical field
The invention belongs to power station energy-saving equipment design field, particularly relate to the upgrading of a kind of clean type coal-burning boiler smoke discharging residual heat and utilize system.
Background technology
According to the first law of thermodynamics, due to the huge of mass flow of discharging fume, coal-burning boiler heat loss due to exhaust gas is a large gravimetrical energy loss of boiler.The exhaust gas temperature design load of the large sized unit of current domestic main flow is about 120 DEG C, and in actual motion, smoke evacuation overheating problem is very common, and some boiler using brown coals even can reach about 160 DEG C.Relative to the general acid dew point at 80-90 DEG C, fume afterheat still has and certain utilizes space further.
UTILIZATION OF VESIDUAL HEAT IN mode conventional is at present by exit flue after the condensate water introducing air preheater in Turbine Steam water system, directly utilizes fume afterheat heat-setting water.This Land use systems principle is simple, can effectively squeeze low pressure (LP) cylinder and draw gas, and reduces turbine heat rate.
Although traditional UTILIZATION OF VESIDUAL HEAT IN is succinctly effective, from the view point of the second law of thermodynamics, discharge fume as the temperature low-grade heat source less than 200 DEG C far away, acting ability is very limited, and this is also the limited basic reason of the actual energy-saving horizontal of traditional UTILIZATION OF VESIDUAL HEAT IN.Specifically, traditional UTILIZATION OF VESIDUAL HEAT IN can only use smoke evacuation heat-setting water system usually, and the efficiency of drawing gas of condensate water part is lower, and therefore energy saving capability is limited.Therefore the technical scheme recycled after some smoke discharging residual heat energy levels promote in recent years is created, as schemes such as a kind of heat of smoke discharged from boiler of power station energy trasfer Multi-class propagation systems that Sun Fengzhong etc. invents, after recognizing the limitation of smoke evacuation, be not content with the direct application to smoke discharging residual heat.This heat utilization mode is transferred in the heat-carrying working medium of more high parameter by smoke discharging residual heat in essence, then carries out heat utilization for this heat-carrying working medium.Smoke discharging residual heat through upgrading can add Hot gas turbine water supply system, squeezes drawing gas of more high parameter, thus brings lower generating energy consumption.
In addition, directly carry out utilization to fume afterheat and have inborn inferior position: first, the heat exchange limit of flue gas is determined by acid dew point substantially, and reducing heat exchange limit further needs special material or special technique; Secondly, the flying dust before electric precipitation in flue gas may cause heat exchanger dust stratification, wearing and tearing, and Long-Time Service will reduce exchange capability of heat, affect the heat exchanger life-span, needs periodic maintenance and changes associated pipe in time.These problems are that the utilization of traditional smoke discharging residual heat is difficult to avoid.
Often there is cold junction problem to be optimized in the air preheater of current main flow.Do not install the cold First air inlet temperature of air preheater of steam air heater additional generally at about 30 DEG C, exhaust gas temperature is then usual at about 120 DEG C or more, and this makes air preheater conduct heat damage and be in higher level, let alone " to mix cold wind " this kind of significantly improves unit the common air preheater hot junction temperature adjustment measure damaged.At present a lot of conservation measures considers the Energy harvesting beyond boiler usual heat exchanger, but energy saving optimizing for traditional heat exchangers and based on the second law of thermodynamics is actually rare.
Summary of the invention
In order to the level-density parameter by air preheater cold-end air reclaims smoke discharging residual heat, promote its energy level and be used, to solve air preheater heat exchange in prior art damage excessive, smoke evacuation overtemperature, waste heat application limited and utilize the problem such as cold end corrosion, wearing and tearing, dust stratification in process, the present invention proposes the upgrading of a kind of clean type coal-burning boiler smoke discharging residual heat and utilize system, comprising:
The burner hearth 10 connected successively in boiler, superheater 11, reheater 12, economizer 13; Economizer 13 is connected with air preheater 1 by air preheater gas approach 8, and air preheater exhaust pass 9 is connected with electric dust-removing equipment;
Primary air fan 2 is connected with air preheater 1 by air preheater inlet conduits 3 successively, and air preheater outlet conduits 4 is connected with burner hearth by heat primary air road 5, pulverized coal preparation system successively;
Described air preheater outlet conduits 4 arranges heat primary air bypass 6, heat primary air bypass 6 is installed bypass air-introduced machine 7 additional and keep hot blast pressure head, and arrange in heat primary air bypass 6 and the gas bypass heat exchanger package 14 needing energy supply low-temperature receiver 15 to be connected; The outlet access air preheater inlet conduits 3 of heat primary air bypass 6.
Control system principle of the present invention is simple, effectively make use of boiler exhaust gas waste heat, and improves the utilization ratio of energy by the coupling again of unit endogenous pyrogen low-temperature receiver, effectively can improve the economic benefit in power station.
Accompanying drawing explanation
Fig. 1 is that the upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system core assembly to illustrate;
Fig. 2 is that the upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system construction drawing.Number in the figure represents respectively: 1-air preheater; 2-primary air fan; 3-air preheater inlet conduits; 4-air preheater outlet conduits; 5-heat primary air road; The bypass of 6-heat primary air; 7-bypass air-introduced machine; 8-air preheater gas approach; 9-air preheater exhaust pass; 10-burner hearth; 11-superheater; 12-reheater; 13-economizer; 14-gas bypass heat exchanger package; 15-needs energy supply low-temperature receiver; 16-Turbine Steam water system assembly; 17-steam turbine high-pressure cylinder; 18-Steam Turbine Through IP Admission; 19-turbine low pressure cylinder; 20-generator; 21-condenser; 22-feed-water pump turbine; 23-condensate pump; 24-oxygen-eliminating device; 25-feed pump; 26-first high-pressure heater; 27-second high-pressure heater; 28-third high pressure heater; 29-first low-pressure heater; 30-second low-pressure heater; 31-the 3rd low-pressure heater; 32-the 4th low-pressure heater; 33-first order geomantic omen heat exchanger; Geomantic omen, 34-second level heat exchanger; 35-the 4th valve; 36-the 3rd valve; 37-second valve; 38-first valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment is elaborated.
As shown in Figure 1, the present invention proposes the upgrading of a kind of clean type coal-burning boiler smoke discharging residual heat and utilize system, comprising:
The burner hearth 10 connected successively in boiler, superheater 11, reheater 12, economizer 13; Economizer 13 is connected with air preheater 1 by air preheater gas approach 8, and air preheater exhaust pass 9 is connected with electric dust-removing equipment;
Primary air fan 2 is connected with air preheater 1 by air preheater inlet conduits 3 successively, and air preheater outlet conduits 4 is connected with burner hearth by heat primary air road 5, pulverized coal preparation system successively;
Described air preheater outlet conduits 4 arranges heat primary air bypass 6, heat primary air bypass 6 is installed bypass air-introduced machine 7 additional and keep hot blast pressure head, and arrange in heat primary air bypass 6 and the gas bypass heat exchanger package 14 needing energy supply low-temperature receiver 15 to be connected; The outlet access air preheater inlet conduits 3 of heat primary air bypass 6.
First high-pressure heater 26, second high-pressure heater 27 is connected with steam turbine high-pressure cylinder 17 respectively;
Third high pressure heater 28, oxygen-eliminating device 24 are connected with Steam Turbine Through IP Admission 18 respectively;
First low-pressure heater 29, second low-pressure heater 30, the 3rd low-pressure heater 31, the 4th low-pressure heater 32 are connected with turbine low pressure cylinder 19 respectively with condenser 21;
Economizer 13, first high-pressure heater 26, second high-pressure heater 27, third high pressure heater 28, oxygen-eliminating device 24, first low-pressure heater 29, second low-pressure heater 30, the 3rd low-pressure heater 31, the 4th low-pressure heater 32 are connected in turn with condenser 21;
The import of described first order geomantic omen heat exchanger 33 presses the entrance of heater 28 to be connected by the 3rd valve 36 and third high, and the outlet of first order geomantic omen heat exchanger 33 is connected by the outlet of the 4th valve 35 with the second high-pressure heater 27.
The import of geomantic omen, described second level heat exchanger 34 is connected by the entrance of the first valve 38 with the 4th low-pressure heater 32, and the outlet of geomantic omen, second level heat exchanger 34 is connected by the outlet of the second valve 37 with the second low-pressure heater 30.
The air outlet slit of geomantic omen, described second level heat exchanger 34 is connected with a cold air channel.
The blast that described bypass air-introduced machine 7 controls heat primary air bypass 6 higher than air preheater outlet conduits 4 blast and lower than the outlet blast of primary air fan 2.
In existing power station equipment, general employing three grades of high-pressure heaters (26,27,28), one-level oxygen-eliminating device (24) and level Four low-pressure heater (29,30,31, the 32) steam extracted in steam turbine carrys out the condensate water in heating system, this part steam have left steam turbine cylinder, acting cannot be continued, but backheat of drawing gas also can improve feed temperature, reduce boiler to be correlated with the heat transfer temperature difference of heat-transfer surface simultaneously, both can reduce the heat transfer of boiler damage, contribute to again the safety in operation improving unit.In fact, if there is other coupling thermal source to replace a part of condensate water of heating of drawing gas in unit, can reduce the extracted steam from turbine of corresponding proportion, this part steam can do work in the cylinder further.If the use of this thermal source does not increase extra energy consumption for unit, can think that unit obtains higher generated energy under same consumption energy, namely achieve unit economy and improve.
Working method of the present invention is: the 300-350 DEG C of hot blast from air preheater outlet conduits 4 is divided into two parts, and a part enters after boiler air channel 5 flows through pulverized coal preparation system and enters burner hearth; Another part enters bypass air channel 6 and flows through first order geomantic omen heat exchanger 33 and geomantic omen, second level heat exchanger 34 successively, mixes subsequently, enters air preheater 1, proceed above-mentioned cyclic process after heat exchange with the cold First air after primary air fan 2.
3rd valve 36 and the 4th valve 35 serve the feedwater position and the flow thereof that control to enter first order geomantic omen heat exchanger 33, first order geomantic omen heat exchanger 33 can be utilized to reclaim the heat heating part feedwater of gas bypass, decrease the extraction flow of steam of the second high-pressure heater 27 and third high pressure heater 28, squeeze the extracted steam from turbine that efficiency of drawing gas is higher.
In like manner, first valve 38 and the second valve 37 serve the feedwater position and the flow thereof that control to enter geomantic omen, second level heat exchanger 34, the heat that geomantic omen, second level heat exchanger 34 can be utilized to reclaim gas bypass heats a part of condensate water, decrease the extraction flow of steam of the second low-pressure heater 30, the 3rd low-pressure heater 31, the 4th low-pressure heater 32, also can realize certain energy-saving effect.Meanwhile, due to the use of first order geomantic omen heat exchanger 33, the Temperature of Working matching degree at heat exchanger 34 place, geomantic omen, the second level is higher, according to the viewpoint of the second law of thermodynamics, unnecessary heat energy can be avoided to devalue.
Compared with traditional residual-heat utilization technology, the technique effect that the present invention brings has:
1. effectively can utilize smoke discharging residual heat, and improve the working environment of waste heat utilization equipment, all can play a role in improving to the heat-economy of unit and safety in operation.And compared with traditional smoke discharging residual heat Utilization plan, due to the raising of energy level, although first law of thermodynamics heat exchange amount is identical, the hot blast in this programme can squeeze the higher extracted steam from turbine of efficiency of drawing gas, acting ability is stronger, can realize the obvious lifting of heat-economy.
2. the energy-saving horizontal of matched to unit of energy level has positive effect.According to analysis theories, the temperature of heat primary air, smoke evacuation is controlled and the preheating of cold First air significantly can reduce the heat exchange of air preheater system damage; And the reasonable employment of bypass heat primary air heat, directly can reduce thermal loss of steam turbine.And see on the whole, in this programme, the Temperature Matching degree of working medium is higher, is more conducive to the improvement of unit heat economy.
3. effectively can reduce and control heat primary air temperature flexibly, improving the safety in operation of pulverized coal preparation system, effectively alleviating the demand even eliminating " mixing cold wind ".
4. effectively can alleviate the phenomenon of lignite-fired unit smoke evacuation overtemperature.
5. effectively can solve the problem of back-end surfaces cold end corrosion, wearing and tearing, dust stratification.
6. system is simple, is convenient to implement, and investment demand is limited; Output is flexible, is convenient to suit measures to local conditions.
This embodiment is only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.

Claims (1)

1. the upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes a system, it is characterized in that, comprising: the burner hearth (10) connected successively in boiler, superheater (11), reheater (12), economizer (13); Economizer (13) is connected with air preheater (1) by air preheater gas approach (8), and air preheater exhaust pass (9) is connected with electric dust-removing equipment;
Primary air fan (2) is connected with air preheater (1) by air preheater inlet conduits (3) successively, and air preheater outlet conduits (4) is connected with burner hearth by heat primary air road (5), pulverized coal preparation system successively;
Air preheater outlet conduits (4) is arranged heat primary air bypass (6), heat primary air bypass (6) is installed bypass air-introduced machine (7) additional and keep hot blast pressure head, and in the upper layout of heat primary air bypass (6) and the gas bypass heat exchanger package (14) needing energy supply low-temperature receiver (15) to be connected; Outlet access air preheater inlet conduits (3) of heat primary air bypass (6).
CN201610053337.8A 2016-01-26 2016-01-26 The upgrading of clean type coal-burning boiler smoke discharging residual heat utilizes system Expired - Fee Related CN105526599B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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CN203703942U (en) * 2013-12-18 2014-07-09 华北电力大学 Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water
CN203784991U (en) * 2014-04-17 2014-08-20 华北电力大学 Hot air recirculating system of coal-fired boiler
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CN204100225U (en) * 2014-08-28 2015-01-14 国电龙源节能技术有限公司 Coal steam-electric plant smoke bootstrap system
CN204853539U (en) * 2015-07-16 2015-12-09 成都融科能源环境工程有限公司 System for utilize hot -blast recycling to get rid of air preheater hydrogen sulfate ammonia
CN204943445U (en) * 2015-09-18 2016-01-06 中国华电集团科学技术研究总院有限公司 For reclaiming the system of coal steam-electric plant smoke waste heat and raising flue gas dust collection efficiency
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Publication number Priority date Publication date Assignee Title
US4576226A (en) * 1983-04-18 1986-03-18 Lipets Adolf U Multipass corrosion-proof air preheater
JPH11132443A (en) * 1997-10-28 1999-05-21 Ishikawajima Harima Heavy Ind Co Ltd Method and device for controlling boiler exhaust gas flow rate of air preheater in exhaust re-burning type combined cycle power plant
JP2007248018A (en) * 2006-03-19 2007-09-27 Mitsui Eng & Shipbuild Co Ltd Control system for supply water preheater of reheat boiler
WO2009113498A1 (en) * 2008-03-12 2009-09-17 株式会社Ihi Boiler equipment and method for operating the same
CN201262408Y (en) * 2008-07-25 2009-06-24 西安热工研究院有限公司 Hot primary air bypass apparatus of coal-burning boiler
CN203671577U (en) * 2013-12-18 2014-06-25 华北电力大学 Efficient waste heat recovery system of machine and boiler coupled air cooling power station
CN203703942U (en) * 2013-12-18 2014-07-09 华北电力大学 Boiler-side flue gas heat energy high-efficiency utilizing system for heating steam-turbine-side heat regenerative feed water
CN203784991U (en) * 2014-04-17 2014-08-20 华北电力大学 Hot air recirculating system of coal-fired boiler
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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