CN203963976U - Be suitable for the coal-fired plant boiler system of underrun - Google Patents
Be suitable for the coal-fired plant boiler system of underrun Download PDFInfo
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- CN203963976U CN203963976U CN201420314160.9U CN201420314160U CN203963976U CN 203963976 U CN203963976 U CN 203963976U CN 201420314160 U CN201420314160 U CN 201420314160U CN 203963976 U CN203963976 U CN 203963976U
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- economizer
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a kind of coal-fired plant boiler system that is suitable for underrun, comprise pulverized coal preparation system, boiler furnace, the back-end ductwork that is communicated with boiler furnace, be arranged on the first economizer of back-end ductwork, the out of stock system of SCR and air preheater, pulverized coal preparation system is sent into the coal dust after grinding in boiler furnace and is burnt, the flue gas that coal dust firing produces passes through successively the first economizer in back-end ductwork, the out of stock system of SCR and air preheater, the pipeline section of back-end ductwork between the first economizer and the out of stock system of SCR is provided with blender, the pipeline section that back-end ductwork is positioned at before the first economizer has the mouth of smoking, this smoking mouthful is communicated with blender by bypass flue, blender can be exported to the out of stock system of SCR by fully mixing with the high-temperature flue gas of inputting from bypass flue by the low-temperature flue gas after the first economizer in back-end ductwork.The utility model can make the out of stock system of SCR also can put into operation during in underrun state at boiler furnace.
Description
Technical field
The utility model relates to a kind of coal-fired plant boiler system that is suitable for underrun, belongs to coal-burning boiler emission-reduction technology field.
Background technology
Fast development along with national economy in recent years, the thermoelectricity installed capacity of China and consumption of coal total amount are respectively from the 391GW of 2005 and 21.4 hundred million tons of 767GW that are increased to 2011 and 35.7 hundred million tons, the problem of the mercury contaminants discharge that correspondingly, coal-burning power plant brings is more outstanding.The nitrogen oxide total amount of power plants discharge in 2009 increases to 8,600,000 tons, accounts for the 38%-45% of national discharged nitrous oxides total amount.Therefore national environmental protection cloth promulgated by the ministries or commissions of the Central Government the new pollutant emission standard GB13223-2011 of thermal power plant, the discharge of more unkindly stipulating thermal power plant's pollutant.
The gas denitrifying technology of thermal power plant's large-scale application mainly contains selective catalytic reduction (SCR) and SNCR method SNCR, wherein selective catalytic reduction (SCR) be at present in the world technology the most ripe, apply maximum denitrating techniques, newly put into operation approximately 9,000 ten thousand kilowatts of coal steam-electric plant smoke denitration unit capacities of China in 2012, adopt the denitration unit capacity of SCR technology SCR technique to account for 98% of the denitration unit total capacity that puts into operation then.As shown in Figure 1, adopt the SCR denitrating system 3 of SCR technique to be generally arranged between boiler economizer 2 and air preheater 4.But when boiler furnace 1 load is on the low side, by the flue gas of SCR denitrating system, can not meet the running temperature (flue-gas temperature >280 ℃) of its catalyst, cause power plant by the operation of SCR denitrating system off-the-line, to cause power plant emission nitrogen oxides in effluent to exceed standard.Particularly current coal-burning power plant integral load rate is not high, the even long-term low load condition operation of indivedual units, and SCR denitrating system cannot put into operation, and the pollutant emission of Zhe Jianggei thermal power plant is controlled and is brought difficulty.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of coal-fired plant boiler system that is suitable for underrun, to overcome in prior art the problem that cannot put into operation and cause coal-burning power plant's discharge nitrogen oxides in effluent to exceed standard during in underrun state at boiler furnace due to SCR denitrating system.
Solve the problems of the technologies described above, the technical scheme that the utility model adopts is as follows:
A kind of coal-fired plant boiler system that is suitable for underrun, comprise pulverized coal preparation system, boiler furnace, the back-end ductwork that is communicated with boiler furnace, be arranged on the first economizer of back-end ductwork, the out of stock system of SCR and air preheater, described pulverized coal preparation system is sent into the coal dust after grinding in boiler furnace and is burnt, the flue gas that coal dust firing produces passes through successively the first economizer in described back-end ductwork, the out of stock system of SCR and air preheater, it is characterized in that: the pipeline section of described back-end ductwork between the first economizer and the out of stock system of SCR is provided with blender, the pipeline section that described back-end ductwork is positioned at before the first economizer has the mouth of smoking, this smoking mouthful is communicated with described blender by bypass flue, described blender can be exported to the out of stock system of described SCR by fully mixing with the high-temperature flue gas of inputting from bypass flue by the low-temperature flue gas after the first economizer in back-end ductwork.
As a kind of improvement of the present utility model, described smoking mouth is provided with the valve of adjustable opening.
As a kind of improvement of the present utility model, the pipeline section of described back-end ductwork between the out of stock system of SCR and air preheater is provided with the second economizer.
Compared with prior art, the utlity model has following beneficial effect:
First, coal-fired plant boiler system of the present utility model is by setting up blender and bypass flue, make flue gas that coal dust firing produces lead up to back-end ductwork and enter the first economizer, its heat is partially recycled by the first economizer, thereby to blender input low-temperature flue gas; Another road flue gas directly leads to blender by bypass flue, thereby to blender input high-temperature flue gas, blender is exported to the out of stock system of SCR after this low-temperature flue gas and high-temperature flue gas are fully mixed into medium temperature flue gas, make thus medium temperature flue gas there is suitable temperature, the catalyst of guaranteeing the out of stock system of SCR obtains enough running temperatures from flue gas, make the out of stock system of SCR of the present utility model also can put into operation during in underrun state at boiler furnace, guarantee that power plant's discharged nitrous oxides in FR load operation is up to standard;
Second, coal-fired plant boiler system of the present utility model is at mouthful valve that adjustable opening is installed of smoking, as long as by thereby the high-temperature flue gas flow of the aperture control inputs blender of valve is rationally set, can make medium temperature flue gas there is suitable temperature, the catalyst that can guarantee the out of stock system of SCR obtains enough running temperatures from flue gas, can not make again the efficiency of coal-burning boiler owing to flowing into excessive the declining to a great extent of flue gas flow of bypass flue 9;
The 3rd, coal-fired plant boiler system of the present utility model, by setting up the second economizer, can make full use of the heat in flue gas, further improves the efficiency of coal-burning boiler;
The 4th, coal-fired plant boiler system of the present utility model is easy to by transforming, realize in existing coal-fired plant boiler system, has advantages of that the system reform is simple, reliable, cost is low.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the schematic diagram of existing coal-fired plant boiler system;
Fig. 2 is the schematic diagram that is suitable for the coal-fired plant boiler system of underrun of the present utility model;
Fig. 3 is the combustion zone schematic diagram of boiler furnace.
The specific embodiment
As shown in Figure 2, the coal-fired plant boiler system that is suitable for underrun of the present utility model, comprise pulverized coal preparation system 5, boiler furnace 1, the back-end ductwork that is communicated with boiler furnace 1, be arranged on the first economizer 201 of back-end ductwork, the out of stock system 3 of SCR and air preheater 4, pulverized coal preparation system 5 is sent into the coal dust after grinding in boiler furnace 1 and is burnt, the flue gas that coal dust firing produces passes through successively the first economizer 201 in back-end ductwork, the out of stock system 3 of SCR and air preheater 4, the pipeline section of back-end ductwork between the first economizer 201 and the out of stock system 3 of SCR is provided with blender 6, the pipeline section that back-end ductwork is positioned at before the first economizer 201 has the mouth 7 of smoking, this mouth 7 of smoking is communicated with blender 6 by bypass flue 9, and the mouth 7 of smoking is provided with the valve 8 of adjustable opening, blender 6 can be exported to the out of stock system 3 of SCR by fully mixing with the high-temperature flue gas of inputting from bypass flue 9 by the low-temperature flue gas after the first economizer 201 in back-end ductwork.
When coal-fired plant boiler system works of the present utility model, the flue gas that coal dust firing produces is leaded up to back-end ductwork and is entered the first economizer 201, and its heat is partially recycled by the first economizer 201, thereby to blender 6 input low-temperature flue gas, another road flue gas directly leads to blender 6 by bypass flue 9, thereby to blender 6 input high-temperature flue gas, blender 6 is exported to the out of stock system 3 of SCR after this low-temperature flue gas and high-temperature flue gas are fully mixed into medium temperature flue gas, as long as by thereby the high-temperature flue gas flow of the aperture control inputs blender 6 of valve 8 is rationally set, can make medium temperature flue gas there is suitable temperature, the catalyst that can guarantee the out of stock system 3 of SCR obtains enough running temperatures from flue gas, can not make again the efficiency of coal-burning boiler owing to flowing into excessive the declining to a great extent of flue gas flow of bypass flue 9.
The utility model also can pass through the increase of the pipeline section between the out of stock system 3 of SCR and air preheater 4 at back-end ductwork the second economizer 202 is installed, to make full use of the heat in flue gas, thus the efficiency of raising coal-burning boiler.And now,, by reducing the heat exchange area of the first economizer 201, to improve the flue-gas temperature of its outlet, can further guarantee that the catalyst of the out of stock system 3 of SCR obtains enough running temperatures.
The invention also discloses the burning method of adjustment of above-mentioned coal-fired plant boiler system under underrun state, comprise: at boiler furnace 1 during in underrun state, adopt any one in following three measures or above boiler furnace 1 carried out to fired state adjustment:
First measure: improve coal powder grinding fineness, the increase rate of this fineness be boiler furnace 1 when normal operating condition 10%～15%, can make thus Pulverized Coal that pulverized coal preparation system 5 sprays in the main combustion zone of boiler furnace 1 state in the low burn rate of oxygen enrichment, thereby the generating rate that suppresses NOx, and the nitrogen oxide generating is reduced in reburning zone, and further suppress new NOx generation.
Referring to Fig. 3, the combustion process of existing coal-fired plant boiler is divided into main combustion zone, reburning zone and burning-out zone from bottom to top, so in boiler furnace 1, is also divided into thus these three regions.
Second measure: increase the intake that boiler furnace 1 is positioned at burning-out zone, the excess air coefficient that makes boiler furnace 1 be positioned at burning-out zone surpasses 1.0, makes temperature in burning-out zone relatively reduce thus, thereby suppresses the generation of NOx.
Three measures: boiler furnace 1 is switched to the duty that goes up three grate firing burner operations most, and adjust the inclination angle of burner, so that the flame kernel in boiler furnace 1 raises, improve thus the outlet cigarette temperature of burner hearth 1, thereby cause the inlet flue gas temperature of SCR denitrating system 3 to improve, make the out of stock system 3 of SCR be easier to obtain and be suitable for the temperature that catalyst puts into operation, guarantee that the nitrogen oxide in flue gas can be removed by the out of stock system 3 of SCR.
The utility model does not limit to and the above-mentioned specific embodiment; according to foregoing; according to ordinary skill knowledge and the customary means of this area; do not departing under the above-mentioned basic fundamental thought of the utility model prerequisite; the utility model can also be made equivalent modifications, replacement or the change of other various ways, all drops among protection domain of the present utility model.
Claims (3)
1. a coal-fired plant boiler system that is suitable for underrun, comprise pulverized coal preparation system (5), boiler furnace (1), the back-end ductwork that is communicated with boiler furnace (1), be arranged on first economizer (201) of back-end ductwork, the out of stock system of SCR (3) and air preheater (4), described pulverized coal preparation system (5) is sent into the coal dust after grinding in boiler furnace (1) and is burnt, the flue gas that coal dust firing produces passes through successively the first economizer (201) in described back-end ductwork, the out of stock system of SCR (3) and air preheater (4), it is characterized in that: the pipeline section that described back-end ductwork is positioned between the first economizer (201) and the out of stock system of SCR (3) is provided with blender (6), described back-end ductwork is positioned at the front pipeline section of the first economizer (201) and has smoke mouthful (7), these smoke mouthful (7) are communicated with described blender (6) by bypass flue (9), described blender (6) can be exported to the out of stock system of described SCR (3) by fully mixing with the high-temperature flue gas of inputting from bypass flue (9) by the low-temperature flue gas after the first economizer (201) in back-end ductwork.
2. coal-fired plant boiler system according to claim 1, is characterized in that: described smoking mouth (7) is provided with the valve (8) of adjustable opening.
3. coal-fired plant boiler system according to claim 1 and 2, is characterized in that: the pipeline section that described back-end ductwork is positioned between the out of stock system of SCR (3) and air preheater (4) is provided with the second economizer (202).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420314160.9U CN203963976U (en) | 2014-06-12 | 2014-06-12 | Be suitable for the coal-fired plant boiler system of underrun |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420314160.9U CN203963976U (en) | 2014-06-12 | 2014-06-12 | Be suitable for the coal-fired plant boiler system of underrun |
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| CN203963976U true CN203963976U (en) | 2014-11-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132358A (en) * | 2014-06-12 | 2014-11-05 | 广东电网公司电力科学研究院 | Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system |
| CN113357661A (en) * | 2021-07-07 | 2021-09-07 | 西安热工研究院有限公司 | Flue gas bypass system for pi-shaped boiler participating in peak shaving |
-
2014
- 2014-06-12 CN CN201420314160.9U patent/CN203963976U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132358A (en) * | 2014-06-12 | 2014-11-05 | 广东电网公司电力科学研究院 | Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system |
| CN113357661A (en) * | 2021-07-07 | 2021-09-07 | 西安热工研究院有限公司 | Flue gas bypass system for pi-shaped boiler participating in peak shaving |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171123 Address after: 510655, No. fifth, No. 146-150, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Patentee after: Guangdong Electric Power Research Institute of energy technology limited liability company Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |
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| TR01 | Transfer of patent right | ||
| CP03 | Change of name, title or address |
Address after: Room 501-503, annex building, Huaye building, No.1-3 Chuimao new street, Xihua Road, Yuexiu District, Guangzhou City, Guangdong Province 510000 Patentee after: China Southern Power Grid Power Technology Co.,Ltd. Address before: 510655 5th floor, no.146-150, Huangpu Avenue Middle Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGDONG ELECTRIC POWER SCIENCE RESEARCH INSTITUTE ENERGY TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |