CN106439878A - Flue gas waste heat utilizing system of condensed water heating boiler for air supply - Google Patents
Flue gas waste heat utilizing system of condensed water heating boiler for air supply Download PDFInfo
- Publication number
- CN106439878A CN106439878A CN201610324926.5A CN201610324926A CN106439878A CN 106439878 A CN106439878 A CN 106439878A CN 201610324926 A CN201610324926 A CN 201610324926A CN 106439878 A CN106439878 A CN 106439878A
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- Prior art keywords
- flue gas
- temperature
- heat exchanger
- low
- air heater
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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
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L15/00—Heating of air supplied for combustion
-
- 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
- Y02E20/34—Indirect 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)
- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The invention relates to a flue gas waste heat utilizing system of a boiler, and particularly discloses a flue gas waste heat utilizing system of a condensed water heating boiler for air supply. The flue gas waste heat utilizing system comprises a steam turbine condensed water pipeline and is characterized in that a high-temperature flue gas heat exchanger is arranged in a front vertical flue of an electrostatic dust collector, a low-temperature flue gas heat exchanger is arranged in an inlet flue of a desulfurizing tower, the high-temperature flue gas heat exchanger communicates with the condensed water pipeline through an inlet pipeline, and return water communicates with the condensed water pipeline through an outlet pipeline; the low-temperature flue gas heat exchanger communicates with the condensed water pipeline through an inlet pipeline, outlet water respectively enters a primary air heater and a secondary air heater through water inlet pipelines of the air heaters, and return water enters the condensed water pipeline through water return pipelines of the air heaters. According to the flue gas waste heat utilizing system, the flue gas temperature can be effectively reduced to about 85 DEG C, and the overall operation benefit of a power plant is increased by utilizing flue gas waste heat; in addition, the flue gas temperature of an inlet of the electrostatic dust collector is reduced, so that the specific resistance of dust is effectively reduced, and the dust collection efficiency of the electrostatic dust collector is improved.
Description
（One）Technical field
The present invention relates to boiler exhaust smoke waste-heat utilization system, particularly to a kind of fume afterheat profit condensing the air-supply of water heating boiler
Use system.
（Two）Background technology
In order to improve the energy-saving effect that fume afterheat utilizes further, need more deeply reducing exhausted smoke temperature, and fume afterheat
Land use systems uses combined heat to condense water and boiler air-supply, and by heating boiler wind pushing temperature, and then raising sky exports with it
Cigarette temperature, improves coagulation hydroenergy backwater temperature gain energy saving of system.The mode of conventional heating boiler air-supply mainly has two kinds, Yi Zhongshi
Arranging low-temperature flue gas heat exchanger and using closed cycle pipeline with water coal formula steam air heater, being situated between by closed cycle water coal is utilized more than flue gas
Hot heating boiler is blown；Another kind is that a high-temperature flue gas heat exchanger backwater part returns condensate system, part heating water coal formula
Steam air heater.However, to ensure that obtain good energy-saving benefit, rational input and output when fully improve air preheater outlet cigarette
, there is shortage of heat and the bigger problem of heat exchange area individually with the air-supply of fume afterheat heating boiler, if utilizing low product in temperature
The heat that position condenses water is blown as supplementary heating boiler, can effectively solve the problems referred to above, improves energy-saving benefit.
（Three）Content of the invention
The present invention, in order to make up the deficiencies in the prior art, provides one and makes full use of low-grade condensation water, improves energy-saving efficiency
Condense water heating boiler air-supply smoke waste heat utilization system.
The present invention is achieved through the following technical solutions：
A kind of smoke waste heat utilization system condensing the air-supply of water heating boiler, including steam turbine condensate line, it is characterised in that：
It is disposed with high-temperature flue gas heat exchanger in vertical flue before described electrostatic precipitator, in desulfurizing tower gas approach, be disposed with low-temperature flue gas
Heat exchanger, high-temperature flue gas heat exchanger connects condensate line, high temperature by high-temperature heat-exchanging inlet duct through high temperature section booster
The backwater of flue gas heat-exchange unit connects condensate line by high-temperature heat-exchanging outlet conduit；Low-temperature flue gas heat exchanger is changed by low temperature
Hot device inlet duct connects condensate line through low-temperature zone booster, and steam air heater water inlet pipe is passed through in the water outlet of low-temperature flue gas heat exchanger
Road respectively enters the First air steam air heater being arranged in an air channel and the Secondary Air steam air heater being arranged in secondary air duct, once
The backwater of wind steam air heater and Secondary Air steam air heater enters condensate line by steam air heater water return pipeline.
The present invention arranges high-temperature flue gas heat exchanger, cloth in desulfurizing tower gas approach before electrostatic precipitator in vertical flue
Set low temperature flue gas heat-exchange unit, in first and second air channel, arrange steam air heater, described high-temperature flue gas heat exchanger and steam turbine condensate pipe
Road connects, and utilizes fume afterheat heat-setting water respectively.Described low-temperature flue gas heat exchanger is connected with steam turbine condensate line, profit
By low-grade condensation water and fume afterheat common heating boiler primary and secondary air, high temperature section and low-temperature zone use the side of two-stage parallel connection
Formula.
The more excellent technical scheme of the present invention is：
It is provided with the recirculation conduit of connection steam air heater water return pipeline on described steam air heater inlet channel, recirculation conduit is installed
There is recirculation pipe valve, it is simple to the switching of steam air heater uses.
Low-temperature zone inlet gate valve, low-temperature zone inlet adjustment valve and low-temperature zone are installed on described cryogenic heat exchanger inlet duct
Inlet non-return valve, high-temperature heat-exchanging inlet duct is provided with high temperature section inlet gate valve, high temperature section inlet adjustment valve and high temperature section
Inlet non-return valve.
High-temperature heat-exchanging backwater valve is installed on described high-temperature heat-exchanging outlet conduit, steam air heater water return pipeline is installed
There is steam air heater backwater valve.
Described high-temperature flue gas heat exchanger and low-temperature flue gas heat exchanger all use modular arrangement, and arrange on outlet conduit
Stop valve.
The body of described high-temperature flue gas heat exchanger, low-temperature flue gas heat exchanger, First air steam air heater and Secondary Air steam air heater is equal
For snakelike comb, select " H " type extended surface tube, it is simple to the maintenance of individual module.
In the present invention, the low-pressure heater mixing main condensate drawn by condensate system, enter through high-temperature flue gas heat exchanger
Mouth pipeline booster boosting, enters the high-temperature flue gas heat exchanger being arranged in front flue of dust collector, flows into high temperature cigarette through snake-like tube row
Gas heat exchanger exit pipeline, enters next stage low addition mouth condensation jellyfish pipe and collects.
The low-pressure heater mixing main condensate drawn by condensate system, through the boosting of low-temperature flue gas heat exchanger inlet conduit
Pump boosts, and enters the low-temperature flue gas heat exchanger being arranged in desulfurizing tower gas approach, flows into steam air heater inlet channel through snake-like tube row,
Respectively enteing first and second steam air heater, backwater enters low addition mouth condensate line by steam air heater water return pipeline.Low-temperature flue gas changes
Hot device system is provided with recirculating line.
The present invention arranges high-temperature flue gas heat exchanger before electrostatic precipitator in flue, in desulfurizing tower gas approach, cloth sets low
Temperature flue gas heat-exchange unit, arranges steam air heater in first and second air channel, and the smoke discharging residual heat being reclaimed is used for two parts, and a part is used
Condensing water in heating steam turbine to realize economizing on coal, another part is used for heating primary and secondary air, improves the comprehensive gold of cold section of air preheater
Belong to wall temperature, protect air preheater, the annual conventional steam steam air heater that substitutes, saving consumption vapour.
In addition jointly heat primary and secondary air by utilizing low-grade condensation water and fume afterheat, improve boiler wind pushing temperature,
Air preheater outlet cigarette temperature improves therewith, improves the energy level that fume afterheat utilizes, and then improves the energy-saving benefit of system.
The present invention can effectively reduce exhaust gas temperature to about 85 DEG C, utilizes fume afterheat, promotes power plant's overall operation benefit,
Additionally, electrostatic precipitator inlet flue gas temperature reduces, effectively reduce dust specific resistance, improve the efficiency of dust collection of electric cleaner.
（Four）Brief description
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention.
In figure, 1 low-temperature zone inlet gate valve, 2 low-temperature zone inlet adjustment valve, 3 low-temperature zone inlet non-return valves, 4 low-temperature zone boostings
Pump, 5 cryogenic heat exchanger inlet ducts, 6 low-temperature flue gas heat exchangers, 7 recirculation pipe valves, 8 recirculation conduits, 9 First air warm braws
Device, 10 Secondary Air steam air heaters, 11 steam air heater water return pipelines, 12 steam air heater backwater valves, 13 high temperature section inlet adjustment valve, 14 high temperature
Section inlet gate valve, 15 high-temperature heat-exchanging inlet ducts, 16 high temperature section inlet non-return valves, 17 high temperature section boosters, 18 high-temperature flue gas
Heat exchanger, 19 high-temperature heat-exchanging outlet conduits, 20 high-temperature heat-exchanging backwater valves.
（Five）Detailed description of the invention
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment includes steam turbine condensate line, described electrostatic precipitator
It is disposed with high-temperature flue gas heat exchanger 18 in front vertical flue, in desulfurizing tower gas approach, be disposed with low-temperature flue gas heat exchanger 6, high temperature
Flue gas heat-exchange unit 18 connects condensate line by high-temperature heat-exchanging inlet duct 15 through high temperature section booster 17, and high-temperature flue gas changes
The backwater of hot device 18 connects condensate line by high-temperature heat-exchanging outlet conduit 19；Low-temperature flue gas heat exchanger 6 is changed by low temperature
Hot device inlet duct 5 connects condensate line through low-temperature zone booster 4, and the water outlet of low-temperature flue gas heat exchanger 6 is entered by steam air heater
Waterpipe respectively enters the First air steam air heater 9 being arranged in an air channel and the Secondary Air steam air heater being arranged in secondary air duct
10, the backwater of First air steam air heater 9 and Secondary Air steam air heater 10 enters condensate line by steam air heater water return pipeline 11；Described
It is provided with the recirculation conduit 8 of connection steam air heater water return pipeline 11 on steam air heater inlet channel, recirculation conduit 8 is provided with again
Circulation pipe valve 7；Low-temperature zone inlet gate valve the 1st, low-temperature zone inlet adjustment valve 2 is installed on described cryogenic heat exchanger inlet duct 5
With low-temperature zone inlet non-return valve 3, high-temperature heat-exchanging inlet duct 15 is provided with high temperature section inlet gate valve the 14th, high temperature section entrance and adjusts
Joint valve 13 and high temperature section inlet non-return valve 16；On described high-temperature heat-exchanging outlet conduit 19, high-temperature heat-exchanging backwater valve is installed
20, steam air heater water return pipeline 11 is provided with steam air heater backwater valve 12；Described high-temperature flue gas heat exchanger 18 and low-temperature flue gas change
Hot device 6 all uses modular arrangement, and arranges stop valve on outlet conduit；Described high-temperature flue gas heat exchanger the 18th, low-temperature flue gas
The body of heat exchanger the 6th, First air steam air heater 9 and Secondary Air steam air heater 10 is snakelike comb, selects " H " type extended surface tube.
Cryogenic heat exchanger inlet duct 5 connects by condensate system through low-temperature zone inlet non-return valve the 3rd, low-temperature zone booster 4
The outlet conduit of No. 7, No. 8 low-pressure heaters drawn, is adjusted by low-temperature zone inlet gate valve 1 and low-temperature zone inlet adjustment valve 2
Inlet water temperature to about 76 DEG C, it is ensured that low-temperature flue gas heat exchanger 6 pipe tube wall temperature is not less than 78 DEG C.Low-temperature flue gas heat exchanger 6
Water outlet respectively enter First air steam air heater 9 and Secondary Air steam air heater 10, through steam air heater water return pipeline 11 and backwater valve 12
Enter No. 8 low addition mouths, complete closed circuit.System arranges recirculation conduit 8, regulates recirculated water by recirculation pipe valve 7
Amount.System heat exchanger and steam air heater are modular arrangement, import and export and arrange valve and pressure-measuring-point, when pipe is revealed can and
When leakage detection and cut-out, convenient maintenance.
Low-temperature flue gas heat exchanger 6 operates in the cigarette temperature environment of 83 DEG C-100 DEG C, and its heat exchanger tube need to possess stronger
Corrosion resistance, selects 2205 stainless steel tubes, it is ensured that the corrosion resistance of tube bank.Low-temperature flue gas heat exchanger 6 uses " H " type fin
Pipe, has anti-blocking ash characteristic, arranges acoustic wave ash ejector, can effectively mitigate stifled ash in low-temperature flue gas environment for the heat exchanger.Warm braw
Device uses high frequency welding spiral fin tube, effectively improves heat transfer effect.
High-temperature flue gas heat exchanger 18 in vertical flue, described high-temperature heat-exchanging inlet duct before being arranged on electrostatic precipitator
15 connect, through high temperature section inlet non-return valve the 16th, high temperature section booster 17, No. 7, No. 8 low-pressure heaters drawn by condensate system
Outlet conduit, adjust inlet water temperature to about 75 DEG C by high temperature section inlet gate valve 14 and high temperature section inlet adjustment valve 13, protect
Card high-temperature flue gas heat exchanger 18 pipe tube wall temperature is not less than 77 DEG C.The water outlet of high-temperature flue gas heat exchanger 18 goes out through high-temperature heat-exchanging
Mouth pipeline the 19th, high-temperature heat-exchanging backwater valve 20 returns to No. 5 low addition mouths.System heat exchanger is modular arrangement, and import and export set
Put valve and pressure-measuring-point, can leakage detection and cut-out in time, conveniently maintenance when pipe is revealed.
High-temperature flue gas heat exchanger 18 operates in the cigarette temperature environment of 100 DEG C-160 DEG C, and heat exchanger tube selects 20G and ND
Steel, it is ensured that tube bank safe and reliable operation.High-temperature flue gas heat exchanger 18 uses " H " type extended surface tube, by intermediate flow channel effect, adopts
By rational cigarette speed, can realize from deashing function.
Flue gas is reduced to 100 DEG C through high-temperature flue gas heat exchanger 18, temperature by 160 DEG C, and condensing water temperature is by 75 DEG C of raisings
To 130 DEG C, energy-saving effect is notable.Flue gas is reduced to 83 DEG C through low-temperature flue gas heat exchanger 6, temperature by 100 DEG C, boiler air-supply temperature
Degree is brought up to about 70 DEG C by 23 DEG C, and then the inlet flue gas temperature effectively improving high-temperature flue gas heat exchanger 18 is brought up to 160 by 130
DEG C, gain energy-saving effect.
Claims (6)
1. condensing a smoke waste heat utilization system for water heating boiler air-supply, including steam turbine condensate line, its feature exists
In：It is disposed with high-temperature flue gas heat exchanger in vertical flue before described electrostatic precipitator（18）, it is disposed with in desulfurizing tower gas approach
Low-temperature flue gas heat exchanger（6）, high-temperature flue gas heat exchanger（18）By high-temperature heat-exchanging inlet duct（15）Through high temperature section booster
（17）Connection condensate line, high-temperature flue gas heat exchanger（18）Backwater pass through high-temperature heat-exchanging outlet conduit（19）Connection condenses
Water lines；Low-temperature flue gas heat exchanger（6）By cryogenic heat exchanger inlet duct（5）Through low-temperature zone booster（4）Connection condenses water
Pipeline, low-temperature flue gas heat exchanger（6）Water outlet respectively enterd by steam air heater inlet channel and be arranged in an air channel once
Wind steam air heater（9）With the Secondary Air steam air heater being arranged in secondary air duct（10）, First air steam air heater（9）With Secondary Air steam air heater
（10）Backwater pass through steam air heater water return pipeline（11）Enter condensate line.
2. the smoke waste heat utilization system of condensation water heating boiler air-supply according to claim 1, it is characterised in that：Described
It is provided with connection steam air heater water return pipeline on steam air heater inlet channel（11）Recirculation conduit（8）, recirculation conduit（8）Upper peace
Equipped with recirculation pipe valve（7）.
3. the smoke waste heat utilization system of condensation water heating boiler air-supply according to claim 1, it is characterised in that：Described
Cryogenic heat exchanger inlet duct（5）On low-temperature zone inlet gate valve is installed（1）, low-temperature zone inlet adjustment valve（2）Enter with low-temperature zone
Mouth check-valves（3）, high-temperature heat-exchanging inlet duct（15）On high temperature section inlet gate valve is installed（14）, high temperature section inlet adjustment valve
（13）With high temperature section inlet non-return valve（16）.
4. the smoke waste heat utilization system of condensation water heating boiler air-supply according to claim 1, it is characterised in that：Described
High-temperature heat-exchanging outlet conduit（19）On high-temperature heat-exchanging backwater valve is installed（20）, steam air heater water return pipeline（11）Upper installation
There is steam air heater backwater valve（12）.
5. the smoke waste heat utilization system of condensation water heating boiler air-supply according to claim 1, it is characterised in that：Described
High-temperature flue gas heat exchanger（18）With low-temperature flue gas heat exchanger（6）All use modular arrangement, and cut-off is set on outlet conduit
Valve.
6. the smoke waste heat utilization system of condensation water heating boiler air-supply according to claim 1, it is characterised in that：Described
High-temperature flue gas heat exchanger（18）, low-temperature flue gas heat exchanger（6）, First air steam air heater（9）With Secondary Air steam air heater（10）Body
It is snakelike comb, select " H " type extended surface tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610324926.5A CN106439878A (en) | 2016-05-17 | 2016-05-17 | Flue gas waste heat utilizing system of condensed water heating boiler for air supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610324926.5A CN106439878A (en) | 2016-05-17 | 2016-05-17 | Flue gas waste heat utilizing system of condensed water heating boiler for air supply |
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| Publication Number | Publication Date |
|---|---|
| CN106439878A true CN106439878A (en) | 2017-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610324926.5A Pending CN106439878A (en) | 2016-05-17 | 2016-05-17 | Flue gas waste heat utilizing system of condensed water heating boiler for air supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061668A (en) * | 2018-02-10 | 2018-05-22 | 华能国际电力股份有限公司 | High-sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination |
| CN109210561A (en) * | 2018-10-25 | 2019-01-15 | 华电新乡发电有限公司 | Power station boiler air pre-heater mentions the association system of effect coupling low-grade flue gas heat recovery and utilization |
| CN109506246A (en) * | 2018-12-07 | 2019-03-22 | 华电新乡发电有限公司 | A kind of water-borne formula steam air heater of two-stage combined heat |
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| US20090272114A1 (en) * | 2004-11-29 | 2009-11-05 | Yasuhiro Takeuchi | Heat recovery equipment |
| CN101737766A (en) * | 2010-01-22 | 2010-06-16 | 西安热工研究院有限公司 | Coal-water boiler exhaust gas residual heat recovery device |
| CN101900347A (en) * | 2010-08-03 | 2010-12-01 | 山东泓奥电力科技有限公司 | System for high-grade recycling waste heat of smoke discharged from boiler of power station |
| CN102313291A (en) * | 2010-06-30 | 2012-01-11 | 中国电力工程顾问集团华东电力设计院 | Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant |
| CN202484963U (en) * | 2012-02-10 | 2012-10-10 | 福建成信绿集成有限公司 | Quality improvement and gradual utilization system of waste heat of boiler smoke of heat-engine plant |
| CN205783017U (en) * | 2016-05-17 | 2016-12-07 | 山东泓奥电力科技有限公司 | A kind of smoke waste heat utilization system condensing the air-supply of water heating boiler |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090272114A1 (en) * | 2004-11-29 | 2009-11-05 | Yasuhiro Takeuchi | Heat recovery equipment |
| CN101737766A (en) * | 2010-01-22 | 2010-06-16 | 西安热工研究院有限公司 | Coal-water boiler exhaust gas residual heat recovery device |
| CN102313291A (en) * | 2010-06-30 | 2012-01-11 | 中国电力工程顾问集团华东电力设计院 | Two-stage smoke-gas-air heat-exchanger system applied to thermal power plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061668A (en) * | 2018-02-10 | 2018-05-22 | 华能国际电力股份有限公司 | High-sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination |
| CN108061668B (en) * | 2018-02-10 | 2023-11-03 | 华能国际电力股份有限公司 | High sulfur coal unit flue gas waste heat utilization is desorption pilot scale test bench in coordination |
| CN109210561A (en) * | 2018-10-25 | 2019-01-15 | 华电新乡发电有限公司 | Power station boiler air pre-heater mentions the association system of effect coupling low-grade flue gas heat recovery and utilization |
| CN109506246A (en) * | 2018-12-07 | 2019-03-22 | 华电新乡发电有限公司 | A kind of water-borne formula steam air heater of two-stage combined heat |
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Application publication date: 20170222 |
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