CN105953213B - A kind of heat pressing type extra-supercritical unit is No. zero high to be added and its switching system - Google Patents
A kind of heat pressing type extra-supercritical unit is No. zero high to be added and its switching system Download PDFInfo
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- CN105953213B CN105953213B CN201610318559.8A CN201610318559A CN105953213B CN 105953213 B CN105953213 B CN 105953213B CN 201610318559 A CN201610318559 A CN 201610318559A CN 105953213 B CN105953213 B CN 105953213B
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- pressure heater
- valve
- pressure
- hot press
- motor
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Classifications
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- 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
Abstract
A kind of heat pressing type extra-supercritical unit of present invention offer is No. zero high to be added and its switching system and the novel process flow for improving fired power generating unit Economical Operation of Light-Loaded, this technological process core is hot press and No. 0 high-pressure heater and its related valve and pipe fitting of connection, and other equipment is original unit equipment.Its main function is drawn gas increase one-level backheat heating in heat regenerative system in original, not only increases heat-economy of the unit in 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；The input of this other set technological process can effectively improve wind-warm syndrome, and mitigate the impact under high pressure ablation operating mode to unit heat economy and boiler safety.
Description
Technical field
The present invention relates to power plant back heating system.Add more particularly, to a kind of heat pressing type extra-supercritical unit is No. zero high
And its switching system.
Background technology
In recent years, the annual of China's fired power generating unit is persistently reduced using hourage, and most of unit load rates are less than
70%, and under low loading conditions, the heat-economy and security of unit will be decreased obviously, therefore consider universal from current power plant
The heat regenerative system of use is improved, to improve the heat-economy of unit under low load condition.From thermodynamics analysis, unit
Backheat series it is more, its thermal efficiency is also higher, but in view of the factor such as steam turbine structure, backheat series also receives certain limit
System, at present frequently with for 7-9 grades of backheats.The Chinese patent of Application No. 201210047719.1 discloses a kind of using injection
The heat regenerative system of formula heat pump, on the basis of the existing backheat of unit, is provided between the bleed steam pipework of adjacent double-bank heater
Jet type heat pump, draws gas by using the higher relatively low next stage of injection pressure that draws gas of pressure, and the mixed vapour of generation 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
Consider by increasing the thermal efficiency of backheat series raising unit, without taking into account during high underload in regenerative steam pressure at different levels
In the case of reduction, boiler feed temperature is relatively low, and its heat consumption under the conditions of rated load compared with still having gap；Due to feedwater in terms of furnace side
Temperature is low, and economizer exit cigarette temperature also can be relatively low, directly results in denitration efficiency decline.
Problems with is primarily present in the prior art：
1st, unit efficiency will be less than design load under low load condition；
2nd, economizer exit cigarette temperature is relatively low under low load condition, it is impossible to ensure denitration efficiency.
The content of the invention
In order to solve the above problems, a kind of No. zero high switching system added of heat pressing type extra-supercritical unit is invented, this is
System mainly includes 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 its valves and fittings for connecting relevant apparatus, wherein main
The valve wanted has：Hot press high pressure side valve (11), hot press low pressure side valve (12), hot press air bleeding valve (13), No. 0
High-pressure heater water side outlet motor-driven valve (14), No. 0 high-pressure heater water side entrance motor-driven valve (15), No. 0 high-pressure heater is dredged
Water motor-driven valve (16), No. 0 high-pressure heater water side bypass motor-driven valve (17).
It can be switched under high and low loading condiction during system operation：In the case of high load capacity, the air inlet of hot press high-pressure side
Valve (11), hot press low pressure side valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet motor-driven valve
(14), No. 0 high-pressure heater water side entrance motor-driven valve (15), No. 0 hydrophobic motor-driven valve of high-pressure heater (16) is turned off, and opens 0
Number high-pressure heater water side bypass motor-driven valve (17), No. 0 high adding system is not put into operation, and No. 1 high-pressure heater water outlet is directly entered
Enter unit heat vapo(u)rization system；Under low load condition, hot press high pressure side valve, hot press low pressure side valve, hot press
Air bleeding valve, No. 0 high-pressure heater water side outlet motor-driven valve, No. 0 high-pressure heater water side entrance motor-driven valve, No. 0 high-pressure heater
Hydrophobic motor-driven valve is opened, and closes No. 0 high-pressure heater water side bypass motor-driven valve, No. 0 high-pressure heater puts into operation, No. 1 high
The water outlet of pressure heater enters No. 0 high-pressure heater and continues to enter back into the heating evaporation system of original system after heating, low negative to improve
The feed temperature of boiler under the conditions of lotus.
The power steam of hot press is derived from boiler main steam during system operation, and the steam being sucked can be connected to original system 1
Section is drawn gas (such as accompanying drawing 1) or 2 sections are drawn gas (such as accompanying drawing 2), and the mixed vapour after matching enters No. 0 high-pressure heater heating boiler
Feedwater, its is hydrophobic to flow automatically to No. 1 high-pressure heater, hydrophobic heat, measures and further reclaims.
No. 0 high-pressure heater is hydrophobic in this system flows automatically to No. 1 high-pressure heater, if Reconstruction in field does not satisfy the requirements, No. 0
HP heater drainage can also be directly discharged to oxygen-eliminating device, but be decreased compared with the former economy.
Referring now to prior art, the advantage of the application is：
1st, by increasing No. zero high plus switching system, the feed temperature of unit under low loading conditions is improved, so that substantially
Improve the economy of unit variable parameter operation；
2nd, economizer exit cigarette temperature is effectively reduced, the normal operation of denitrating system is advantageously ensured that；
3rd, impact high plus that excision is to unit heat economy and boiler safety can be mitigated to a certain extent.
Brief description of the drawings
Next the application will be further explained with reference to accompanying drawing, wherein：
Fig. 1：The present invention heat pressing type extra-supercritical unit it is No. zero high plus and its switching system embodiment one；
Fig. 2：The present invention heat pressing type extra-supercritical unit it is No. zero high plus and its switching system embodiment two；
In figure：
1- boilers,
2- steam turbine high-pressure cylinders,
3- Steam Turbine Through IP Admissions,
No. zero high-pressure heater of 4-,
5-1 high-pressure heaters,
6-2 high-pressure heaters,
7-3 high-pressure heaters,
8- oxygen-eliminating devices,
9- hot presses,
10- feed pumps,
11- hot press high pressure side valves,
12- hot press low pressure side valves,
13- hot press air bleeding valves,
14-0 high-pressure heater water side outlet motor-driven valves,
15-0 high-pressure heater water side entrance motor-driven valve,
The hydrophobic motor-driven valve of 16-0 high-pressure heaters,
17-0 high-pressure heater water side bypasses motor-driven valve.
Embodiment
The present invention provides that a kind of heat pressing type extra-supercritical unit is No. zero high plus and its switching system and to improve fired power generating unit low
The novel process flow of load operation economy, this technological process core be hot press and No. 0 high-pressure heater and its
The related valve and pipe fitting of connection, other equipment are original unit equipment.Its main function is to be drawn gas in original in heat regenerative system
Increase the heating of one-level backheat, not only increase heat-economy of the unit in underload, and can effectively improve economizer
Export cigarette temperature, it is ensured that the removal efficiency of denitrating system under running on the lower load；The input of this other set technological process can be effective
Wind-warm syndrome is improved, and mitigates the impact under high pressure ablation operating mode to unit heat economy and boiler safety.
In order to solve the above mentioned problem of prior art, a kind of No. zero high switching added of heat pressing type extra-supercritical unit has been invented
System, this system mainly include boiler (1), steam turbine high-pressure cylinder (2), Steam Turbine Through IP Admission (3), No. 0, No. 1, No. 2, it is No. 3 high
Press heater (4,5,6,7), oxygen-eliminating device (8), hot press (9) and feed pump (10) and its valve and pipe for connecting relevant apparatus
Part, wherein main valve has：Hot press high pressure side valve (11), hot press low pressure side valve (12), hot press exhaust
Valve (13), No. 0 high-pressure heater water side outlet motor-driven valve (14), No. 0 high-pressure heater water side entrance motor-driven valve (15) is No. 0 high
Press heater condensate motor-driven valve (16), No. 0 high-pressure heater water side bypass motor-driven valve (17).
It can be switched under high and low loading condiction during system operation：In the case of high load capacity, the air inlet of hot press high-pressure side
Valve (11), hot press low pressure side valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet motor-driven valve
(14), No. 0 high-pressure heater water side entrance motor-driven valve (15), No. 0 hydrophobic motor-driven valve of high-pressure heater (16) is turned off, and opens 0
Number high-pressure heater water side bypass motor-driven valve (17), No. 0 high adding system is not put into operation, and No. 1 high-pressure heater water outlet is directly entered
Enter unit heat vapo(u)rization system；Under low load condition, hot press high pressure side valve, hot press low pressure side valve, hot press
Air bleeding valve, No. 0 high-pressure heater water side outlet motor-driven valve, No. 0 high-pressure heater water side entrance motor-driven valve, No. 0 high-pressure heater
Hydrophobic motor-driven valve is opened, and closes No. 0 high-pressure heater water side bypass motor-driven valve, No. 0 high-pressure heater puts into operation, No. 1 high
The water outlet of pressure heater enters No. 0 high-pressure heater and continues to enter back into the heating evaporation system of original system after heating, low negative to improve
The feed temperature of boiler under the conditions of lotus.
The power steam of hot press is derived from boiler main steam during system operation, and the steam being sucked can be connected to original system 1
Section is drawn gas (such as accompanying drawing 1) or 2 sections are drawn gas (such as accompanying drawing 2), and the mixed vapour after matching enters No. 0 high-pressure heater heating boiler
Feedwater, its is hydrophobic to flow automatically to No. 1 high-pressure heater, hydrophobic heat, measures and further reclaims.
No. 0 high-pressure heater is hydrophobic in this system flows automatically to No. 1 high-pressure heater, if Reconstruction in field does not satisfy the requirements, No. 0
HP heater drainage can also be directly discharged to oxygen-eliminating device, but be decreased compared with the former economy.
Referring now to prior art, the advantage of the application is：
1st, by increasing No. zero high plus switching system, the feed temperature of unit under low loading conditions is improved, so that substantially
Improve the economy of unit variable parameter operation；
2nd, economizer exit cigarette temperature is effectively reduced, the normal operation of denitrating system is advantageously ensured that；
3rd, impact high plus that excision is to unit heat economy and boiler safety can be mitigated to a certain extent.
Case study on implementation：
By taking certain power plant 1000MW extra-supercritical units as an example, hot press power steam is derived from main steam, aspirates one section of steam
Mixed vapour enters No. 0 high-pressure heater afterwards, is calculated under 50%, 75% loading condiction, with the unit before transformation after transformation
Thermal parameter is as shown in the table, and reduction 29kj/ (kW.h) before No. zero high plus rear heat consumption is relatively put into is put under 75% loading condiction,
32kj/ (kW.h) is reduced under 50% loading condiction, is calculated with boiler efficiency 93%, mark coal low heat valve 29300kj/kg,
Unit generation coal consumption reduces unit generation coal consumption under 1.075g/kWh, 50% loading condiction and reduced under 75% loading condiction
1.186g/kWh.Calculated with annual electricity generating capacity in this load section with 3,000,000,000 kWh, about 3300 tons of coal of mark can be saved every year, with notable
Energy-saving and emission-reduction benefit.
Thus, using hot press first order regenerative steam can be made to heat feedwater in the heater of more high pressure, so that substantially
Improve the heat-economy of unit variable parameter operation；The coal dust wind pushing temperature under low load condition can also be ensured, maintained in stove
Flameholding, reduces combustible loss；And it is possible to the flue-gas temperature of economizer exit under low load condition is effectively improved, so that
Ensure the denitration efficiency of flue gas；Further, high add when cutting off to unit heat economy and pot can be mitigated to a certain extent
The impact of stove security.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.Protection scope of the present invention is defined by the claims.
Claims (2)
1. a kind of switching system of No. zero high-pressure heater of heat pressing type extra-supercritical unit, the system mainly includes boiler (1), vapour
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), heat
Press (9) and feed pump (10) and its valves and fittings for connecting relevant apparatus, wherein main valve has：Hot press high-pressure side
Intake valve (11), hot press low pressure side valve (12), hot press air bleeding valve (13), No. 0 high-pressure heater water side outlet is electronic
Valve (14), No. 0 high-pressure heater water side entrance motor-driven valve (15), No. 0 hydrophobic motor-driven valve of high-pressure heater (16), No. 0 high pressure adds
Hot device water side bypass motor-driven valve (17)；
It can be switched under high and low loading condiction during system operation：
In the case of high load capacity, hot press high pressure side valve (11), hot press low pressure side valve (12), hot press air bleeding valve
(13), No. 0 high-pressure heater water side outlet motor-driven valve (14), No. 0 high-pressure heater water side entrance motor-driven valve (15), No. 0 high pressure
Heater condensate motor-driven valve (16) is turned off, and opens No. 0 high-pressure heater water side bypass motor-driven valve (17), No. 0 high-pressure heater
System does not put 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 valve, hot press low pressure side valve, hot press air bleeding valve, No. 0 high pressure
Heater water side outlet motor-driven valve, No. 0 high-pressure heater water side entrance motor-driven valve, No. 0 hydrophobic motor-driven valve of high-pressure heater is beaten
Open, close No. 0 high-pressure heater water side bypass motor-driven valve, No. 0 high-pressure heater is put into operation, and No. 1 high-pressure heater water outlet is entered
Enter No. 0 high-pressure heater to continue to enter back into the heating evaporation system of original system after heating；
Wherein system operation when hot press power steam be derived from boiler main steam, the steam being sucked can be connected to original system 1
Section is drawn gas or 2 sections are drawn gas, and the mixed vapour after matching enters No. 0 high-pressure heater heating boiler feed water；
Wherein No. 0 high-pressure heater is hydrophobic to flow automatically to No. 1 high-pressure heater.
2. switching system according to claim 1, wherein No. 0 high-pressure heater is hydrophobic to be 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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| 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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| CN105953213A CN105953213A (en) | 2016-09-21 |
| CN105953213B true CN105953213B (en) | 2017-08-29 |
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Families Citing this family (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 |
| 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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| CN101650022A (en) * | 2009-08-21 | 2010-02-17 | 上海电力学院 | Steam turbine interstage back-heating heater cross-class connecting system |
| 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
- 2016-05-16 CN CN201610318559.8A patent/CN105953213B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650022A (en) * | 2009-08-21 | 2010-02-17 | 上海电力学院 | Steam turbine interstage back-heating heater cross-class connecting system |
| 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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