CN105953213A - Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof - Google Patents
Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof Download PDFInfo
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- CN105953213A CN105953213A CN201610318559.8A CN201610318559A CN105953213A CN 105953213 A CN105953213 A CN 105953213A CN 201610318559 A CN201610318559 A CN 201610318559A CN 105953213 A CN105953213 A CN 105953213A
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- 238000007731 hot pressing Methods 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000005520 electrodynamics Effects 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 230000002209 hydrophobic effect Effects 0.000 claims description 18
- 230000000740 bleeding effect Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000001172 regenerating effect Effects 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, 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
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention provides a hot-pressing type ultra supercritical unit number-zero high-pressure heater, a switching system thereof and a novel technological process for improving the low-load running economical efficiency of thermal power generating units. A hot press, the number-0 high-pressure heater and related valves and pipe fittings connected with the hot press and the number-0 high-pressure heater are used as core parts of the technological process, and all other devices are devices of existing units. The technological process has a main effect of adding a level of regenerative heating to an existing steam extraction heat recovery system, the thermal economical efficiency of the units under low loads is improved, the smoke temperature of an outlet of an economizer can be effectively improved, and the removal efficiency of a denitration system under the low-load work condition is ensured. In addition, due to input of the set of technological process, the air temperature can be effectively increased, and impact generated on the unit thermal economical efficiency and the boiler safety under the high-pressure cut-off work condition can be relieved.
Description
Technical field
The present invention relates to power plant back heating system.Especially relate to that a kind of heat pressing type extra-supercritical unit zero is high adds and switched system.
Background technology
In recent years, China's fired power generating unit annual utilizes hourage persistently to reduce, most of unit load rates are less than 70%, and under low loading conditions, the heat-economy of unit and safety to be decreased obviously, therefore consider that the heat regenerative system from current power plant is commonly used improves, to improve the heat-economy of unit under low load condition.From thermodynamics analysis, the backheat progression of unit is the most, and its thermal efficiency is the highest, but in view of factors such as steam turbine structures, backheat progression also receives certain restriction, at present frequently with for 7-9 level backheat.The Chinese patent of Application No. 201210047719.1 discloses a kind of heat regenerative system using jet type heat pump, on the basis of the existing backheat of unit, it is provided with jet type heat pump between the bleed steam pipework of adjacent double-bank heater, the next stage relatively low by the injection pressure that draws gas utilizing pressure higher draws gas, the mixed vapour produced enters heat-setting water in the bleeder heater newly increased, the irreversible loss in heat recovery process is reduced with this, but this patent is only to consider to improve the thermal efficiency of unit by increasing backheat progression, and when not taking into account high underload in the case of regenerative steam pressure at different levels reduce, boiler feed temperature is on the low side, gap is still had under the conditions of its heat consumption relatively rated load；Furnace side aspect is low due to feed temperature, and economizer exit cigarette temperature also can be on the low side, directly results in denitration efficiency and declines.
Prior art is primarily present problems with:
1, unit efficiency design load to be less than under low load condition；
2, under low load condition, economizer exit cigarette temperature is on the low side, it is impossible to ensure denitration efficiency.
Summary of the invention
In order to solve the problems referred to above, invent the high switched system added of a kind of heat pressing type extra-supercritical unit zero, this system mainly comprises boiler (1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), No. 0, No. 1, No. 2, No. 3 high-pressure heaters (4, 5, 6, 7), oxygen-eliminating device (8), hot press (9) and feed pump (10) and connect the valves and fittings of relevant apparatus, main valve has: hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16), No. 0 high-pressure heater water side bypass electrodynamic valve (17).
At height when system is run, can switch under low load condition: in the case of high load capacity, hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16) is turned off, open No. 0 high-pressure heater water side bypass electrodynamic valve (17), No. 0 high adding system does not puts into operation, No. 1 high-pressure heater water outlet is directly entered unit heat vapo(u)rization system；Under low load condition, hot press high-pressure side intake valve, hot press low-pressure side intake valve, hot press air bleeding valve, No. 0 high-pressure heater water side outlet electrodynamic valve, No. 0 high-pressure heater water side entrance electrodynamic valve, No. 0 hydrophobic electrodynamic valve of high-pressure heater is all opened, close No. 0 high-pressure heater water side bypass electrodynamic valve, No. 0 high-pressure heater puts into operation, No. 1 high-pressure heater water outlet enters the heating evaporation system entering back into original system after No. 0 high-pressure heater continues heating, to improve the feed temperature of boiler under low load condition.
System run time hot press power steam take from boiler main steam, the steam being sucked can connect from original system 1 section draw gas (asAccompanying drawing 1) or 2 sections draw gas (asAccompanying drawing 2), mixed vapour after coupling enters No. 0 high-pressure heater heating boiler feed water, and it is hydrophobic flows automatically to No. 1 high-pressure heater, hydrophobic heat, measures further recovery.
In this system, No. 0 high-pressure heater is hydrophobic flows automatically to No. 1 high-pressure heater, if Reconstruction in field does not satisfies the requirements, No. 0 HP heater drainage also can be directly discharged to oxygen-eliminating device, but relatively the former economy decreases.
Referring now to prior art, the advantage of the application is:
1, by increasing No. zero high switched system that adds, improve unit feed temperature under low loading conditions, thus significantly improve the economy of unit variable parameter operation；
2, effectively reduce economizer exit cigarette temperature, advantageously ensure that the properly functioning of denitrating system；
3, height can be alleviated to a certain extent and add excision to unit heat economy and the impact of boiler safety.
Accompanying drawing explanation
Next will be in conjunction withAccompanying drawingThe application is further explained, wherein:
Figure 1: the heat pressing type extra-supercritical unit of the present invention zero is high to be added and the embodiment one of switched system；
Figure 2: the heat pressing type extra-supercritical unit of the present invention zero is high to be added and the embodiment two of switched system；
In figure:
1-boiler,
2-steam turbine high-pressure cylinder,
3-Steam Turbine Through IP Admission,
No. zero high-pressure heater of 4-,
5-1 high-pressure heater,
6-2 high-pressure heater,
7-3 high-pressure heater,
8-oxygen-eliminating device,
9-hot press,
10-feed pump,
11-hot press high-pressure side intake valve,
12-hot press low-pressure side intake valve,
13-hot press air bleeding valve,
14-0 high-pressure heater water side outlet electrodynamic valve,
15-0 high-pressure heater water side entrance electrodynamic valve,
The hydrophobic electrodynamic valve of 16-0 high-pressure heater,
17-0 high-pressure heater water side bypass electrodynamic valve.
Detailed description of the invention
The present invention providesIt is a kind of that heat pressing type extra-supercritical unit zero is high adds and switched systemWith raising fired power generating unit Economical Operation of Light-LoadedNovelTechnological process, this technological process core is hot press and No. 0 high-pressure heater and the related valve of connection thereof and pipe fitting, and other equipment are original unit equipment.Its Main Function is to increase the heating of one-level backheat in former heat regenerative system of drawing gas, and not only increases the unit heat-economy when underload, and can effectively improve economizer exit cigarette temperature, it is ensured that the removal efficiency of denitrating system under running on the lower load；Additionally input of this set technological process can effectively improve pathogenic wind-warm, and alleviates under high pressure ablation operating mode the impact to unit heat economy and boiler safety.
In order to solve the problems referred to above of prior art, invent the high switched system added of a kind of heat pressing type extra-supercritical unit zero, this system mainly comprises boiler (1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), No. 0, No. 1, No. 2, No. 3 high-pressure heaters (4, 5, 6, 7), oxygen-eliminating device (8), hot press (9) and feed pump (10) and connect the valves and fittings of relevant apparatus, main valve has: hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16), No. 0 high-pressure heater water side bypass electrodynamic valve (17).
At height when system is run, can switch under low load condition: in the case of high load capacity, hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16) is turned off, open No. 0 high-pressure heater water side bypass electrodynamic valve (17), No. 0 high adding system does not puts into operation, No. 1 high-pressure heater water outlet is directly entered unit heat vapo(u)rization system；Under low load condition, hot press high-pressure side intake valve, hot press low-pressure side intake valve, hot press air bleeding valve, No. 0 high-pressure heater water side outlet electrodynamic valve, No. 0 high-pressure heater water side entrance electrodynamic valve, No. 0 hydrophobic electrodynamic valve of high-pressure heater is all opened, close No. 0 high-pressure heater water side bypass electrodynamic valve, No. 0 high-pressure heater puts into operation, No. 1 high-pressure heater water outlet enters the heating evaporation system entering back into original system after No. 0 high-pressure heater continues heating, to improve the feed temperature of boiler under low load condition.
System run time hot press power steam take from boiler main steam, the steam being sucked can connect from original system 1 section draw gas (asAccompanying drawing 1) or 2 sections draw gas (asAccompanying drawing 2), mixed vapour after coupling enters No. 0 high-pressure heater heating boiler feed water, and it is hydrophobic flows automatically to No. 1 high-pressure heater, hydrophobic heat, measures further recovery.
In this system, No. 0 high-pressure heater is hydrophobic flows automatically to No. 1 high-pressure heater, if Reconstruction in field does not satisfies the requirements, No. 0 HP heater drainage also can be directly discharged to oxygen-eliminating device, but relatively the former economy decreases.
Referring now to prior art, the advantage of the application is:
1, by increasing No. zero high switched system that adds, improve unit feed temperature under low loading conditions, thus significantly improve the economy of unit variable parameter operation；
2, effectively reduce economizer exit cigarette temperature, advantageously ensure that the properly functioning of denitrating system；
3, height can be alleviated to a certain extent and add excision to unit heat economy and the impact of boiler safety.
Case study on implementation:
As a example by certain power plant 1000MW extra-supercritical unit, hot press power steam takes from main steam, aspirates mixed vapour after one section of steam and enters No. 0 high-pressure heater, is calculated under 50%, 75% loading condiction, after transformation with transformation before unit thermal parameter such asFollowing table instituteShow, under 75% loading condiction, input zero high adding, reduces 29kj/ (kW.h) before rear heat consumption relatively puts into, 32kj/ (kW.h) is reduced under 50% loading condiction, calculate with boiler efficiency 93%, mark coal low heat valve 29300kj/kg, under 75% loading condiction, unit generation coal consumption reduces 1.075g/kWh, and under 50% loading condiction, unit generation coal consumption reduces 1.186g/kWh.Calculate with 3,000,000,000 kWh with annual electricity generating capacity in this load section, about 3300 tons of coal of mark can be saved every year, there is significant energy-saving and emission-reduction benefit.
Thus, utilize hot press that first order regenerative steam can be made to heat feedwater in the heater of more high pressure, thus significantly improve the heat-economy of unit variable parameter operation；The coal dust wind pushing temperature under low load condition can also be ensured, maintain the flameholding in stove, reduce combustible loss；And it is possible to be effectively improved the flue-gas temperature of economizer exit under low load condition, thus ensure the denitration efficiency of flue gas；Further, it is possible to alleviate to a certain extent when height adds excision unit heat economy and the impact of boiler safety.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means that the specific features, structure, material or the feature that combine this embodiment or example description are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be to combine in one or more embodiments in office or example in an appropriate manner.Additionally, in the case of the most conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be combined and combine by those skilled in the art.
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is exemplary, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.Protection scope of the present invention is defined by the claims.
Claims (4)
1. No. zero high switched system added of a heat pressing type extra-supercritical unit, this system mainly comprises boiler (1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), No. 0, No. 1, No. 2, No. 3 high-pressure heaters (4, 5, 6, 7), oxygen-eliminating device (8), hot press (9) and feed pump (10) and connect the valves and fittings of relevant apparatus, main valve has: hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16), No. 0 high-pressure heater water side bypass electrodynamic valve (17)；
System can switch over when running under high and low loading condiction:
In the case of high load capacity, hot press high-pressure side intake valve (11), hot press low-pressure side intake valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet electrodynamic valve (14), No. 0 high-pressure heater water side entrance electrodynamic valve (15), No. 0 hydrophobic electrodynamic valve of high-pressure heater (16) is turned off, open No. 0 high-pressure heater water side bypass electrodynamic valve (17), No. 0 high adding system does not puts into operation, and No. 1 high-pressure heater water outlet is directly entered unit heat vapo(u)rization system；
Under low loading conditions, hot press high-pressure side intake valve, hot press low-pressure side intake valve, hot press air bleeding valve, No. 0 high-pressure heater water side outlet electrodynamic valve, No. 0 high-pressure heater water side entrance electrodynamic valve, No. 0 hydrophobic electrodynamic valve of high-pressure heater is all opened, closing No. 0 high-pressure heater water side bypass electrodynamic valve, No. 0 high-pressure heater puts into operation, and No. 1 high-pressure heater water outlet enters the heating evaporation system entering back into original system after No. 0 high-pressure heater continues heating.
Switched system the most according to claim 1, when wherein system is run, the power steam of hot press takes from boiler main steam, the steam being sucked can connect draw gas from original system 1 section or 2 sections draw gas, mixed vapour after coupling enters No. 0 high-pressure heater heating boiler feed water, and it is hydrophobic flows automatically to No. 1 high-pressure heater.
Switched system the most according to claim 2, wherein No. 0 high-pressure heater is hydrophobic flows automatically to No. 1 high-pressure heater.
Switched system the most according to claim 2, wherein No. 0 HP heater drainage is directly discharged to oxygen-eliminating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610318559.8A CN105953213B (en) | 2016-05-16 | 2016-05-16 | A kind of heat pressing type extra-supercritical unit is No. zero high to be added and its switching system |
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| CN201610318559.8A CN105953213B (en) | 2016-05-16 | 2016-05-16 | A kind of heat pressing type extra-supercritical unit is No. zero high to be added and its switching system |
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| CN105953213A true CN105953213A (en) | 2016-09-21 |
| CN105953213B CN105953213B (en) | 2017-08-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705019A (en) * | 2016-12-07 | 2017-05-24 | 上海电气电站设备有限公司 | Wide-load efficient water supply regenerative system |
| CN107143841A (en) * | 2017-05-22 | 2017-09-08 | 大唐(北京)能源管理有限公司 | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load |
| CN109707466A (en) * | 2019-02-28 | 2019-05-03 | 杭州华惠阀门有限公司 | A kind of extra-supercritical unit and its high plus leakage emergent treatment system |
| CN110056854A (en) * | 2019-04-03 | 2019-07-26 | 东南大学 | The steam-supplying system and operation method of No. zero high-pressure heater in a kind of coal unit |
| CN111664441A (en) * | 2020-05-09 | 2020-09-15 | 上海发电设备成套设计研究院有限责任公司 | Flexible hot-state switching zero-number high-voltage system |
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| CN203756252U (en) * | 2014-03-20 | 2014-08-06 | 王振宇 | Turbine regenerative system of ultra supercritical unit |
| CN105435597A (en) * | 2015-12-23 | 2016-03-30 | 广东惠州平海发电厂有限公司 | System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit |
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2016
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Patent Citations (3)
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| CN101650022A (en) * | 2009-08-21 | 2010-02-17 | 上海电力学院 | Steam turbine interstage back-heating heater cross-class connecting system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106705019A (en) * | 2016-12-07 | 2017-05-24 | 上海电气电站设备有限公司 | Wide-load efficient water supply regenerative system |
| CN107143841A (en) * | 2017-05-22 | 2017-09-08 | 大唐(北京)能源管理有限公司 | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load |
| CN109707466A (en) * | 2019-02-28 | 2019-05-03 | 杭州华惠阀门有限公司 | A kind of extra-supercritical unit and its high plus leakage emergent treatment system |
| CN110056854A (en) * | 2019-04-03 | 2019-07-26 | 东南大学 | The steam-supplying system and operation method of No. zero high-pressure heater in a kind of coal unit |
| CN110056854B (en) * | 2019-04-03 | 2020-03-31 | 东南大学 | Steam supply system of zero-number high-pressure heater in coal-fired unit and operation method |
| CN111664441A (en) * | 2020-05-09 | 2020-09-15 | 上海发电设备成套设计研究院有限责任公司 | Flexible hot-state switching zero-number high-voltage system |
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| CN105953213B (en) | 2017-08-29 |
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