CN104976609A - Water feeding heating system capable of improving denitration effect - Google Patents
Water feeding heating system capable of improving denitration effect Download PDFInfo
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- CN104976609A CN104976609A CN201510344983.5A CN201510344983A CN104976609A CN 104976609 A CN104976609 A CN 104976609A CN 201510344983 A CN201510344983 A CN 201510344983A CN 104976609 A CN104976609 A CN 104976609A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 230000000694 effects Effects 0.000 title abstract description 16
- 235000019504 cigarettes Nutrition 0.000 claims description 8
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010977 unit operation Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- 239000003054 catalyst Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
A water feeding heating system capable of improving the denitration effect comprises a jetting type heat pump, a high-pressure steam valve, a steam extraction steam inlet valve, a mixed steam outlet valve, a jetting type heat pump switching valve, a boiler, a steam turbine and a high-pressure heater. The boiler is connected with the jetting type heat pump and the steam turbine, a first pipeline is led out of a hot oil returning steam pipe of the steam turbine and is communicated with the high-pressure heater, and a second pipeline is communicated with a jetting type heat pump; an outlet of the jetting type heat pump is communicated with the steam side of the high-pressure heater, and the water feeding temperature of the boiler under the low load can be improved by 30 DEG C to 60 DEG C; and the effective running load interval of an SCR device is greatly widened, the denitration effect of smoke under the low load is ensured, and the safety and reliability of the boiler are improved.
Description
Technical field
The present invention relates to a kind of fired power generating unit feed heating system, particularly a kind of feed heating system improving denitration effect.
Background technology
The fired power generating unit installed capacity of current China account for total installation of generating capacity about 70%, generated energy accounts for about 80% of gross generation, thermoelectricity is occupied an leading position in power industry.China's fired power generating unit not only bears base load, also frequently participates in peak regulation, and underload and frequent varying duty have become the normal operating condition of Chinese large-sized coal unit.Along with the change of Chinese society economic development and life style, electrical network peak-valley difference is up to 50%.Add up according to middle Electricity Federation, China's fired power generating unit annual in recent years utilizes hourage at 5000 hours, and unit load rate is lower than 60%, and unit is in the time of variable parameter operation than reaching 70% in Life cycle.
Current stage, China's fossil-fired unit denitration generally adopts selective catalytic reduction (SCR), and its principle is under the effect of catalyst, NO
xwith NH
3react, generate water vapour and nitrogen.For ensureing the effect of denitration, require the temperature of flue gas within limits, flue-gas temperature is too high, then catalyst easy-sintering, loss of activity; Flue-gas temperature is too low, then reaction speed declines, affects denitration effect.In Practical Project, after SCR device is arranged on economizer, before air preheater, to meet the flue-gas temperature required by denitration.
When fired power generating unit underrun, economizer exit cigarette temperature declines, the attenuated activity of SCR device inner catalyst, affects denitration effect on the one hand, makes the NO in flue gas
xcontent increases; Cause the escaping of ammonia on the other hand, in air preheater and boiler back end ductwork, form NH
4f, (NH
4)
2sO
3deng, blocking flow passages, makes flue gas resistance rise, and affects the safe and stable operation of equipment.When unit load declines, flue gas flow also declines thereupon, and furnace outlet gas temperature reduces, and reheat steam temperature and boiler feed temperature all decline, thus cause economizer exit cigarette temperature to decline; After load drops to certain value, the denitration efficiency of SCR device sharply declines, and NOx emission is raised; Unreacted NH
3escape, in air preheater and boiler back end ductwork, form NH
4f, (NH
4)
2sO
3deng, blocking flow passages, makes flue gas resistance rise; Flue-gas temperature declines, and makes air preheater export hot blast temperature reduction, affects the combustion stability of boiler, and aggravate the corrosion of boiler back end ductwork relevant device.After the coal steam-electric plant smoke pollutant emission standard formulation that China is new, all there are these problems when underrun in the SCR denitration device of national fired power generating unit.
For solving the problem, existing measure mainly contains feed water by-pass, gas bypass, economizer hierarchical arrangement etc.Although feed water by-pass system is simple, it is little to invest, is in operation and feed temperature and flow can be made to produce very large disturbance, threaten the hydrodynamic force security of boiler water wall; Gas bypass investment is large and flue-gas temperature is uneven, and effect is poor; Economizer hierarchical arrangement can solve the denitration problem of SCR under underload, but under high loads the easy overtemperature of SCR device, make sintering of catalyst.
Summary of the invention
For solving the problem, the present invention proposes a kind of for improving fired power generating unit underload denitration effect feed heating system, be heated by by feedwater and improve boiler feed temperature and reduce the heat release of flue gas in economizer, its security is good, it is moderate to invest, and has a good application prospect.
For achieving the above object, the present invention takes following design:
A kind of fired power generating unit feed heating system, comprise jet type heat pump, Pressure Steam Valve, the inlet valve that draws gas, mixed vapour outlet valve, jet type heat pump transfer valve, boiler, steam turbine, high-pressure heater, it is characterized in that: boiler connects jet type heat pump and steam turbine, draw the first pipeline from the regenerative steam pipe of steam turbine to be connected with high-pressure heater, draw the second pipeline to be connected with jet type heat pump simultaneously, the outlet of described jet type heat pump is connected with high-pressure heater steam side, and high-pressure heater water outlet side joint is connected with boiler.
Further, the first pipeline is provided with jet type heat pump transfer valve, is connected with high-pressure heater.
Further, the pipeline between boiler and jet type heat pump is provided with Pressure Steam Valve.
Further, the second pipeline is provided with the inlet valve that draws gas, is connected with jet type heat pump.
Further, jet type heat pump is connected to the water-cooling wall outlet header of boiler; The regenerative steam Guan Jing that steam turbine pressure the is the highest inlet valve that draws gas enters jet type heat pump.
Further, jet type heat pump undertaken putting into operation and stop transport by jet type heat pump transfer valve between switching.
Further, when thermal power unit operation load is comparatively large, boiler economizer outlet cigarette temperature meets the requirement of SCR device denitration, opens jet type heat pump transfer valve, close high steam inlet valve, draw gas inlet valve; When fired power generating unit load is lower, boiler economizer outlet cigarette temperature does not meet the requirement of SCR device denitration, closes jet type heat pump transfer valve, open high steam inlet valve, section draws gas inlet valve; When fired power generating unit load is very low, jet type heat pump outlet mixed vapour pressure can not meet feedwater heating requirements, closes jet type heat pump transfer valve, section draws gas inlet valve, open high steam inlet valve.
Further, the running parameter scope of jet type heat pump is: inject ratio opens 0 greatly, and compression ratio is greater than 1.
Further, the running parameter scope of jet type heat pump is: inject ratio is 0.1 ~ 2.0, and compression ratio is 1.2 ~ 2.5.
Advantage of the present invention is: draw the lower main steam of temperature from boiler water wall outlet header, injection pressure turbine 1 section draws gas, replacing 1 section draw gas as No. 1 high vapour source added using jet type heat pump outlet mixed vapour, improving denitration effect under unit underload by increasing substantially boiler feedwater feed temperature.Adopt this technology, the feed temperature of boiler under underload can be made to improve 30 DEG C-60 DEG C, effective operating load interval of SCR device is significantly expanded, ensure that the denitration effect of flue gas under underload, improve its security reliability of boiler.
Accompanying drawing explanation
Fig. 1 is the structural representation of native system.
Fig. 2 is the schematic diagram of jet type heat pump.
In figure 1, jet type heat pump; 2, Pressure Steam Valve; 3,1 section of inlet valve that draws gas; 4, mixed vapour outlet valve; 5, jet type heat pump transfer valve; 6, boiler; 7, steam turbine; 8, No. 1 high-pressure heater; 9, high pressure nozzle; 10, hybrid chamber; 11, high steam; 12, middle pressure steam; 13, low-pressure steam.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail, should be appreciated that content described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
See Fig. 1, in the present invention, system comprises jet type heat pump 1, Pressure Steam Valve 2,1 section of inlet valve 3 that draws gas, mixed vapour outlet valve 4 and jet type heat pump transfer valve 5; The jet type heat pump 1 be connected with boiler and steam turbine 7, pipeline between boiler and jet type heat pump 1 is provided with Pressure Steam Valve 2, the regenerative steam that in steam turbine 7, pressure is the highest is drawn a road via regenerative steam pipe and is connected with high-pressure heater 8 through jet type heat pump transfer valve 5, another road is connected with jet type heat pump 1 after the inlet valve 3 that draws gas, the outlet of described jet type heat pump 1 is connected with high-pressure heater 8 steam side through mixed vapour outlet valve 4, high-pressure heater 8 heating boiler feed water, the water outlet side of high-pressure heater 8 is connected with boiler 6.
High steam needed for jet type heat pump 1, from the water-cooling wall outlet header of boiler 6, enters jet type heat pump 1 through high steam inlet valve 2; By jetting steam caused 1 section of regenerative steam from steam turbine 7, enter jet type heat pump 1 through 1 section of inlet valve 3 that draws gas; 1 section is drawn gas compression by high steam in jet type heat pump, and the mixed vapour formed enters No. 1 high-pressure heater 8 heating boiler feed water through mixed vapour outlet valve 4; Switching between jet type heat pump 1 is undertaken putting into operation and stop transport by jet type heat pump transfer valve 5;
When thermal power unit operation load is comparatively large, boiler economizer outlet cigarette temperature meets the requirement of SCR device denitration, opens jet type heat pump transfer valve 5, close high steam inlet valve 2,1 section of inlet valve 3 that draws gas; When fired power generating unit load is lower, boiler economizer outlet cigarette temperature does not meet the requirement of SCR device denitration, closes jet type heat pump transfer valve 5, open high steam inlet valve 2,1 section of inlet valve 3 that draws gas; When fired power generating unit load is very low, jet type heat pump 1 exports mixed vapour pressure when can not meet feedwater heating requirements, closes jet type heat pump transfer valve 5,1 section of inlet valve 3 that draws gas, opens high steam inlet valve 2;
The running parameter scope of jet type heat pump 1 is: inject ratio (1 section is drawn gas and the ratio of high steam flow) opens 0 greatly, be preferably 0.1 ~ 2.0, compression ratio (ratio of jet type heat pump outlet mixed vapour absolute pressure and 1 section of absolute pressure of drawing gas) is greater than 1, is preferably 1.2 ~ 2.5.
The scheme that the present invention proposes belongs to feedwater heating, and its principle is by improving the heating steam pressure entering No. 1 high-pressure heater, improving the feed temperature of boiler.Because boiler feedwater flow during underload declines, the exchange capability of heat of this heater is more rich, and after heating steam pressure raises, its leaving water temperature also raises, thus achieves the lifting of feed temperature.
In order to promote the pressure of the heating steam entering No. 1 high-pressure heater, present invention employs the jet type heat pump shown in Fig. 2, the spare interface on boiler water wall outlet header is utilized to draw high steam, jet type heat pump is entered through Pressure Steam Valve, and 1 section is drawn gas and enters jet type heat pump through 1 section of inlet valve that draws gas, the mixed vapour pressure produced, between these two bursts of admission, replaces 1 section to draw gas and enters No. 1 high-pressure heater, thus the lifting of feed temperature under realizing underload.Due to boiler water wall outlet header and 1 section of extraction temperature all lower, relevant pipeline and all available common heat-resisting steels of valve, system investments is lower.
Jet type heat pump is widely used in multiple fields.Fig. 2 gives the principle schematic of jet type heat pump, high steam 11 expands through high pressure nozzle 9 and forms high velocity air, mix with low-pressure steam 13, the middle pressure steam 12 of mineralization pressure between high steam and low-pressure steam after hybrid chamber 10, its essence is and utilize the kinetic energy of high steam to promote the pressure of low-pressure steam.Compared with the heat pump of other types, this heat pump structure is simple, and movement-less part, the course of work is safe and reliable.
Replace 1 section to draw gas owing to adopting part boiler water wall outlet vapor and add hot vapour source as No. 1 high-pressure heater, after adopting the present invention, the efficiency of unit declines to some extent, and coa consumption rate rises about about 0.3g/kWh as calculated; Therefore this system handoff functionality, can adopt excision jet type heat pump under high loads, return to original heat regenerative system.
When unit load is very low, the outlet pressure of jet type heat pump can not meet the demand of feedwater heating, now need excision 1 section to draw gas, the steam from boiler water wall outlet header enters No. 1 high-pressure heater after jet type heat pump, and now jet type heat pump is equivalent to decompressing or throttling device.
Advantage of the present invention
(1) the present invention utilizes jet type heat pump and underload feed-water heater heated feed water, improves the feed temperature under underrun situation, ensure that the denitration effect of running on the lower load.Jet type heat pump structure is simple, movement-less part, and the course of work is safe and reliable;
(2) adopt the present invention that feed temperature can be made to improve 30 DEG C-60 DEG C;
(3) underload feed heating system of the present invention, its system is simple, invests little, safe and reliable; Namely can be used for new-built unit design, also can be used for the transformation of existing unit, have broad application prospects.
Last it is noted that the foregoing is only explanation of the present invention, be not limited to the present invention, although to invention has been detailed description, for a person skilled in the art, it still can be modified to aforementioned described technical scheme, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a fired power generating unit feed heating system, comprise jet type heat pump, Pressure Steam Valve, the inlet valve that draws gas, mixed vapour outlet valve, jet type heat pump transfer valve, boiler, steam turbine, high-pressure heater, it is characterized in that: boiler connects jet type heat pump and steam turbine, draw the first pipeline from the regenerative steam pipe of steam turbine to be connected with high-pressure heater, draw the second pipeline to be connected with jet type heat pump simultaneously, the outlet of described jet type heat pump is connected with high-pressure heater steam side, and high-pressure heater water outlet side joint is connected with boiler.
2. fired power generating unit feed heating system according to claim 1, is characterized in that: on the first pipeline, be provided with jet type heat pump transfer valve, be connected with high-pressure heater.
3. fired power generating unit feed heating system according to claim 2, is characterized in that: the pipeline between boiler and jet type heat pump is provided with Pressure Steam Valve.
4. fired power generating unit feed heating system according to claim 3, is characterized in that: on the second pipeline, be provided with the inlet valve that draws gas, be connected with jet type heat pump.
5. fired power generating unit feed heating system according to claim 1, is characterized in that: jet type heat pump is connected to the water-cooling wall outlet header of boiler; The regenerative steam Guan Jing that steam turbine pressure the is the highest inlet valve that draws gas enters jet type heat pump.
6. fired power generating unit feed heating system according to claim 2, is characterized in that: the switching between jet type heat pump is undertaken putting into operation and stop transport by jet type heat pump transfer valve.
7. fired power generating unit feed heating system according to claim 4, it is characterized in that: when thermal power unit operation load is comparatively large, boiler economizer outlet cigarette temperature meets the requirement of SCR device denitration, open jet type heat pump transfer valve, close high steam inlet valve, draw gas inlet valve; When fired power generating unit load is lower, boiler economizer outlet cigarette temperature does not meet the requirement of SCR device denitration, closes jet type heat pump transfer valve, open high steam inlet valve, section draws gas inlet valve; When fired power generating unit load is very low, jet type heat pump outlet mixed vapour pressure can not meet feedwater heating requirements, closes jet type heat pump transfer valve, section draws gas inlet valve, open high steam inlet valve.
8. fired power generating unit feed heating system according to claim 1, is characterized in that: the running parameter scope of jet type heat pump is: inject ratio opens 0 greatly, and compression ratio is greater than 1.
9. fired power generating unit feed heating system according to claim 8, it is characterized in that: the running parameter scope of jet type heat pump is: inject ratio is 0.1 ~ 2.0, compression ratio is 1.2 ~ 2.5.
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| CN201510344983.5A CN104976609B (en) | 2015-06-17 | 2015-06-17 | A kind of feed heating system for improving denitration effect |
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| CN201510344983.5A CN104976609B (en) | 2015-06-17 | 2015-06-17 | A kind of feed heating system for improving denitration effect |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106076117A (en) * | 2016-07-11 | 2016-11-09 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit efficient low-load denitrification apparatus and control method |
| CN106195995A (en) * | 2016-08-04 | 2016-12-07 | 联合瑞升（北京）科技有限公司 | A kind of heating power jet pump height adds steam-supplying system |
| CN108613164A (en) * | 2018-04-08 | 2018-10-02 | 大唐(北京)能源管理有限公司 | The feed heating system of denitration effect under a kind of improvement underload |
| CN110056853A (en) * | 2019-05-13 | 2019-07-26 | 国家电投集团电站运营技术（北京）有限公司 | Boiler thermodynamic system and its control method |
| CN110319431A (en) * | 2019-02-18 | 2019-10-11 | 联合瑞升（北京）科技有限公司 | Economizer lower water temperature system under a kind of full load denitration operating condition |
| CN111878843A (en) * | 2020-08-17 | 2020-11-03 | 国电科学技术研究院有限公司 | Wide load denitration flue gas temperature lift system |
| CN112082144A (en) * | 2020-08-26 | 2020-12-15 | 普瑞森能源科技（北京）股份有限公司 | Multi-steam-source water supply temperature control system and method for low-load operation of unit |
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| CN110319431A (en) * | 2019-02-18 | 2019-10-11 | 联合瑞升（北京）科技有限公司 | Economizer lower water temperature system under a kind of full load denitration operating condition |
| CN110056853A (en) * | 2019-05-13 | 2019-07-26 | 国家电投集团电站运营技术（北京）有限公司 | Boiler thermodynamic system and its control method |
| CN111878843A (en) * | 2020-08-17 | 2020-11-03 | 国电科学技术研究院有限公司 | Wide load denitration flue gas temperature lift system |
| CN112082144A (en) * | 2020-08-26 | 2020-12-15 | 普瑞森能源科技（北京）股份有限公司 | Multi-steam-source water supply temperature control system and method for low-load operation of unit |
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