CN104061564A - 0# high-pressure heater system with back heating crossing units - Google Patents
0# high-pressure heater system with back heating crossing units Download PDFInfo
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- CN104061564A CN104061564A CN201410339773.2A CN201410339773A CN104061564A CN 104061564 A CN104061564 A CN 104061564A CN 201410339773 A CN201410339773 A CN 201410339773A CN 104061564 A CN104061564 A CN 104061564A
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Abstract
The invention discloses a 0# high-pressure heater system with back heating crossing units. The 0# high-pressure heater system heats supplied water of a supercritical (ultra supercritical) unit through high-temperature steam of a subcritical unit. The supercritical (ultra supercritical) unit comprises a supercritical (ultra supercritical) boiler, a supercritical (ultra supercritical) turbine high-pressure cylinder, a 0# high-pressure heater, a boiler economizer and a water supply pump, wherein the water supply pump supplies water to the boiler economizer. The subcritical unit comprises a subcritical boiler, a boiler overheater and a subcritical turbine high-pressure cylinder. Main steam in the subcritical unit or middle steam in the boiler overheater is sucked into the 0# high-pressure heater through a steam pipeline and is used for heating supplied water of the supercritical (ultra supercritical) unit. The 0# high-pressure heater system with back heating crossing the units is suitable for various units and is not confined to units with turbines provided with a steam supplement valve connector. The 0# high-pressure heater system with back heating crossing the units has the advantages of being low in power consumption and high in back heating efficiency and can effectively improve the temperature of supplied water entering the economizer and reduce the drop-out rate of an underload denitration system of the units.
Description
Technical field
The present invention relates to high-pressure heater system, be specifically related to No. 0 high-pressure heater system across unit backheat.
Background technology
Existing super (super-) critical unit, in the time of underrun, compared with at full capacity, feed temperature reduces more, has caused whole unit effectiveness of regenerator to decline.Simultaneously; because the feed temperature that enters boiler economizer reduces; cause power plant's denitrating system in the time of underload not drop into; cannot meet the requirement of " denitrating system should be able to continue safe operation between boiler minimum steady combustion load and any operating mode of BMCR " in HJ562-2010 " coal steam-electric plant smoke denitration engineering legislation selective catalytic reduction ", cause certain influence to environmental protection.Therefore, need to improve the feed temperature that enters boiler economizer, to reduce the rate that exits of underload denitrating system.
Fig. 1 shows No. 0 high-pressure heater system of the prior art.This No. 0 high-pressure heater system applies is in super (super-) critical unit, this super (super-) critical unit comprises super (super-) critical boiler 1, boiler economizer 2, steam turbine high-pressure cylinder 3, oxygen-eliminating device 4, feed pump 5, 6 and No. 0 high-pressure heater 7 of high-pressure heater, main steam line 12 is set between super (super-) critical boiler 1 and steam turbine high-pressure cylinder 3 for carrying main steam to steam turbine high-pressure cylinder 3, main steam line 12 is provided with the stop valve 11 for regulating steam flow, on steam turbine high-pressure cylinder 3, be provided with filling valve interface 9, one end of jet chimney 13 is connected with filling valve interface 9 and the other end is connected to high-pressure heater No. 0, feedwater with the steam in extraction steam turbine high-pressure cylinder 3 for No. 0 high-pressure heater of heater, feedwater in No. 0 high-pressure heater is provided by feed pump 5 and carries out deoxygenation via oxygen-eliminating device, feedwater after No. 0 high-pressure heater heating is provided to boiler economizer and is entered denitrating system by feedwater piping 14.
The super (super-) critical unit of application prior art need meet some requirements, and adopts the steam turbine of the specific pattern that comprises filling valve.As shown in Figure 1, steam turbine high-pressure cylinder 3 is provided with filling valve interface 9, between filling valve interface 9 and stop valve 11, is provided with gas filling pipeline, to supplement steam to steam turbine high-pressure cylinder 3.When needs provide while adding hot vapour source to No. 0 high-pressure heater, need to remove filling valve and front and back pipeline, jet chimney 13 is connected with filling valve interface 9.
This shows, there is following problem in prior art scheme:
(1) prior art is only applicable to adopting the unit of specific steam turbine pattern, on steam turbine high-pressure cylinder, needs to be provided with filling valve interface, and for the steam-turbine unit that is not provided with filling valve interface on other steam turbine high-pressure cylinders, cannot apply prior art.
(2) in prior art, need to remove the filling valve that former steam turbine configures.The steam turbine of this kind of pattern, because of the feature of its structural shape, for meeting the needs of unit frequency modulation and excess load generating, therefore configured filling valve, and after filling valve is removed in prior art, needing to redesign the mode of frequency regulation of unit, the excess load generating capacity of unit also will be affected.
(3) in prior art, utilize the distinctive filling valve of steam turbine interface to extract No. 0 high-pressure heater of Steam Heating in steam turbine, and the steam turbine of this kind of pattern supplements steam for passing through this interface in former design in steam turbine, prior art has changed the method for operation of this interface, produce certain impact for the vibration of steam turbine and the safe operation of unit, need steam turbine plant to adjust the stability of turbine shafting.
Summary of the invention
The object of this invention is to provide one high-pressure heater system safely and effectively, can ensure under the condition of unit safety operation, improve the feed temperature of unit, thereby improve the effectiveness of regenerator of whole power plant, improve unit simultaneously and completely send out allowance, improve unit underload denitrating system and exit rate, increase environmental benefit.
For achieving the above object, the invention provides a kind of No. 0 high-pressure heater system across unit backheat, this No. 0 high-pressure heater system applies is in ultra supercritical unit or supercritical unit, ultra supercritical unit or supercritical unit comprise ultra supercritical or super critical boiler, ultra supercritical or supercritical pressure turbine high pressure cylinder, No. 0 high-pressure heater, boiler economizer and feed pump, between ultra supercritical or super critical boiler and ultra supercritical or supercritical pressure turbine high pressure cylinder, be provided with the main steam line for carry main steam to high pressure cylinder, between feed pump and boiler economizer, be provided with the feedwater piping for carry feedwater to boiler economizer, the vapour source that is used for the feedwater of heating ultra supercritical unit or supercritical unit comes from Subcritical Units, Subcritical Units comprises subcritical boiler, boiler superheater and subcritical pressure turbine high pressure cylinder, between subcritical boiler and subcritical pressure turbine high pressure cylinder, be connected with the subcritical main steam line for carry main steam to subcritical pressure turbine high pressure cylinder, between ultra supercritical unit or supercritical unit and Subcritical Units, be provided with jet chimney, the high-temperature steam of Subcritical Units transfers to No. 0 high-pressure heater of ultra supercritical unit or supercritical unit by jet chimney, for heated feed water.
Preferably, the two ends of jet chimney connect respectively subcritical main steam line and No. 0 high-pressure heater, enter No. 0 high-pressure heater for the ducted feedwater of heated feed water from the high-temperature steam of subcritical main steam line.
Preferably, the two ends of jet chimney connect respectively the boiler superheater intergrade of No. 0 high-pressure heater and Subcritical Units, enter No. 0 high-pressure heater for the ducted feedwater of heated feed water from the intermediate extraction of Subcritical Units boiler superheater.
Preferably, No. 0 high-pressure heater system comprises two or more high-pressure heaters, No. 0 high-pressure heater add main steam or the boiler superheater intermediate extraction that hot vapour source is Subcritical Units.
Preferably, the temperature of the high-temperature steam of Subcritical Units is approximately 400 DEG C～approximately 545 DEG C, more preferably approximately 450 DEG C～approximately 538 DEG C.
Preferably, the temperature of feedwater that enters the boiler economizer of ultra supercritical unit or supercritical unit is higher than approximately 280 DEG C.
Preferably, ultra supercritical unit or supercritical unit are also provided with oxygen-eliminating device, and oxygen-eliminating device is for carrying out deoxygenation to feedwater.
This patent is No. 0 high-pressure heater systems technology across unit backheat, in super (super-) critical unit heat regenerative system, set up No. 0 high-pressure heater, utilize main steam or the boiler superheater intermediate extraction of Subcritical Units in power plant to heat the feedwater in No. 0 high-pressure heater, improve the feed temperature that enters boiler economizer, improve the effectiveness of regenerator of unit, improve underload denitrating system and exited rate, there is economy, efficiently, safety, the feature of environmental protection, applicable to the steam turbine of various types, special in the power plant that has super (super-) critical and Subcritical Units simultaneously, there is good promotion prospect.
Steam turbine across No. 0 high-pressure heater systems technology of unit backheat applicable to various types, special in the power plant that has super (super-) critical and Subcritical Units simultaneously, there is good promotion prospect.Compared with prior art, in improving unit effectiveness of regenerator, avoid the negative effect to unit safety operation, improved the rate that exits of unit denitrating system underload simultaneously due to the raising of feed temperature, there is good environmental benefit.
This technology adopts No. 0 high-pressure heater system new technology across unit backheat, improve the feed temperature of super (super-) critical unit, thereby improve the effectiveness of regenerator of whole power plant, and the rate that exits of denitrating system while improving unit underload, environmental benefit there is.
Brief description of the drawings
Fig. 1 is the schematic diagram of No. 0 high-pressure heater system of the prior art;
Fig. 2 is according to the schematic diagram of No. 0 high-pressure heater system across unit backheat of first embodiment of the invention; And
Fig. 3 is according to the schematic diagram of No. 0 high-pressure heater system across unit backheat of second embodiment of the invention.
Terminological interpretation
Across unit backheat: by the main steam of Subcritical Units or superheater intermediate extraction, receive the heat regenerative system of heated feed water on No. 0 newly-increased high-pressure heater of super (super-) critical unit.
High-pressure heater: utilize the part of the steam turbine device that feedwater is heated that draws gas, this device is made up of housing and piping two large divisions, on housing inner chamber top, steam condensation section is set, bottom arranges hydrophobic cooling section, inlet tube and outlet tube top arrange feed-water inlet and give water out.After superheated steam enters housing by import, the feedwater in the heat exchanger tube of top can be heated, after steam condensation is water, the hot water condensing again can be by the feedwater heating in hydrophobic bottom cooling section, and the condensate water after being utilized flows out external through hydrophobic outlet.
Denitration: utilize reducing agent under the effect of catalyst selectively with flue gas in NOx there is chemical reaction, generate the method for nitrogen G&W.
Detailed description of the invention
Below with reference to accompanying drawing, preferred embodiment of the present invention is elaborated, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and just for the connotation of technical solution of the present invention is described.
Fig. 2 is according to the schematic diagram of No. 0 high-pressure heater system across unit backheat of first embodiment of the invention.The hot vapour source that adds of No. 0 high-pressure heater of setting up in super (super-) critical unit heat regenerative system as shown in Figure 2, comes from the Subcritical Units main steam in power plant.This Subcritical Units comprises Subcritical Units boiler 15, boiler superheater 16 and steam turbine high-pressure cylinder 3 ', between Subcritical Units boiler 15 and steam turbine high-pressure cylinder 3 ', be connected with for steam turbine high-pressure cylinder 3 ' and carry the main steam line 12 ' of main steam, main steam line 12 ' is provided with the stop valve 11 ' for regulating main steam, between main steam line 12 ' and No. 0 high-pressure heater 7, be connected with jet chimney 13, thereby utilize the main steam of Subcritical Units to heating by the feedwater of No. 0 high-pressure heater, thereby improve the temperature of the feedwater of the boiler economizer that enters super (super-) critical unit.As can be seen from Figure 2, the present invention is applicable to the super (super-) critical unit of various types steam turbine.
In a preferred embodiment, it is approximately 538 DEG C for the temperature of the Subcritical Units main steam that heats described feedwater.
Fig. 3 is according to the schematic diagram of No. 0 high-pressure heater system across unit backheat of second embodiment of the invention.Different from the first embodiment is, in the present embodiment, the hot vapour source that adds of No. 0 high-pressure heater of setting up in super (super-) critical unit heat regenerative system comes from drawing gas that in power plant, subcritical unit boiler superheater intermediate parameters is mated, drawing gas in jet chimney 13 enters No. 0 high-pressure heater for feedwater is heated after control valve 8, thereby improves the feed temperature that enters boiler economizer.
In a preferred embodiment, it is approximately 450 DEG C for the temperature of the Subcritical Units intermediate steam that heats described feedwater.
In Fig. 2 and Fig. 3 the difference of embodiment be No. 0 high-pressure heater to add hot vapour source slightly different, in the first embodiment, add the main steam that hot vapour source is Subcritical Units, and the hot vapour source that adds in the second embodiment is the intermediate extraction of Subcritical Units boiler superheater.When concrete engineering is implemented, can determine the hot vapour source that adds mating with No. 0 high-pressure heater according to unit parameter.
Number of units across the heat regenerative system mesohigh heater of No. 0 high-pressure heater system of unit backheat is determined by heat regenerative system, and single-row or multiple row high-pressure heater can be set.
Advantage of the present invention
The present invention adopts the main steam of Subcritical Units in power plant or the boiler superheater intermediate extraction hot vapour source that adds as No. 0 high-pressure heater, than drawing gas for the prior art scheme of heated feed water from steam turbine by filling valve interface, the present invention also has the following advantages:
Be applicable to the unit of various types steam turbine, be not only confined to steam turbine and be provided with the unit of filling valve interface;
For the ultra supercritical unit with filling valve, when can retaining former filling valve, reach and improve the temperature that enters economizer feedwater, avoid the negative effect for unit operation bringing because removing filling valve, for the ultra supercritical unit with filling valve, owing to having obtained the filling of Subcritical Units, the allowance of completely sending out of unit improves, the number of times of opening filling valve because of excess load generating reduces, improve the efficiency of operation, reduce unit vibration, improve the security of operation;
Adopt the feedwater of Subcritical Units high-temperature steam heating super (super-) critical unit Subcritical Units, improve the feed temperature that enters economizer, power plant efficiency gets a promotion, be conducive to reduce coal consumption, in the embodiment of the present invention, to the power plant of 1 600MW super (super-) critical unit and 1 600MW Subcritical Units, can save every year approximately 3000 tons, mark coal;
The present invention enters the feed temperature of economizer while adopting suitable vapour source to improve unit underload, thereby improves the flue-gas temperature that enters denitrating system, and when unit is loaded more than 40%BMCR, denitrating system all can drop into.
In sum, the present invention has economy, the feature such as safe, reliable, environmentally friendly, special in the power plant that has super (super-) critical and Subcritical Units simultaneously, has good promotion prospect.No. 0 high-pressure heater system across unit backheat has improved by No. 0 suitable high-pressure heater vapour source the feed temperature that enters boiler economizer, reduce unit hear rate, thereby improve the effectiveness of regenerator of unit, and eliminated and in prior art, cancelled the negative effect that filling valve brings.Simultaneously owing to having improved the feed temperature of boiler economizer, during particularly for underload, by controlling the quantity of steam of No. 0 high-pressure heater, can greatly improve underload is the feed temperature that enters boiler economizer, thereby improve the flue-gas temperature that enters denitrating system, reduce the denitration of unit underload and exit rate, there is good environmental benefit.
Below described preferred embodiment of the present invention in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present invention, those skilled in the art can make various changes or modifications the present invention.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (8)
1. a No. 0 high-pressure heater system across unit backheat, described No. 0 high-pressure heater system applies is in ultra supercritical unit or supercritical unit, described ultra supercritical unit or supercritical unit comprise ultra supercritical or super critical boiler, ultra supercritical or supercritical pressure turbine high pressure cylinder, No. 0 high-pressure heater, boiler economizer and feed pump, between described ultra supercritical or super critical boiler and described ultra supercritical or supercritical pressure turbine high pressure cylinder, be provided with the main steam line for carry main steam to described high pressure cylinder, between described feed pump and described boiler economizer, be provided with the feedwater piping for carry feedwater to described boiler economizer, it is characterized in that,
The vapour source that is used for the feedwater of heating described ultra supercritical unit or supercritical unit comes from Subcritical Units, described Subcritical Units comprises subcritical boiler, boiler superheater and subcritical pressure turbine high pressure cylinder, is connected with the subcritical main steam line for carry main steam to described subcritical pressure turbine high pressure cylinder between described subcritical boiler and described subcritical pressure turbine high pressure cylinder; And
Between described ultra supercritical unit or supercritical unit and described Subcritical Units, be provided with jet chimney, the high-temperature steam of described Subcritical Units transfers to described No. 0 high-pressure heater of described ultra supercritical unit or supercritical unit by described jet chimney, for heating described feedwater.
2. No. 0 high-pressure heater system as claimed in claim 1, it is characterized in that, the two ends of described jet chimney connect respectively described subcritical main steam line and described No. 0 high-pressure heater, enter described No. 0 high-pressure heater for heating the feedwater of described feedwater piping from the high-temperature steam of described subcritical main steam line.
3. No. 0 high-pressure heater system as claimed in claim 1, it is characterized in that, the two ends of described jet chimney connect respectively the boiler superheater intergrade of described No. 0 high-pressure heater and described Subcritical Units, enter described No. 0 high-pressure heater for heating the feedwater of described feedwater piping from the intermediate extraction of described Subcritical Units boiler superheater.
4. No. 0 high-pressure heater system as claimed in claim 1, it is characterized in that, described No. 0 high-pressure heater system comprises two or more high-pressure heaters, described No. 0 high-pressure heater add main steam or the boiler superheater intermediate extraction that hot vapour source is described Subcritical Units.
5. No. 0 high-pressure heater system as claimed in claim 1, is characterized in that, the temperature of the high-temperature steam of described Subcritical Units is approximately 400 DEG C～approximately 545 DEG C.
6. No. 0 high-pressure heater system as claimed in claim 5, is characterized in that, the temperature of the high-temperature steam of described Subcritical Units is approximately 450 DEG C～approximately 538 DEG C.
7. No. 0 high-pressure heater system as claimed in claim 1, is characterized in that, enters the temperature of feedwater of the boiler economizer of described ultra supercritical unit or supercritical unit higher than 280 DEG C.
8. No. 0 high-pressure heater system as claimed in claim 1, is characterized in that, described ultra supercritical unit or supercritical unit are also provided with oxygen-eliminating device, and described oxygen-eliminating device is for carrying out deoxygenation to described feedwater.
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| CN201410339773.2A CN104061564B (en) | 2014-07-16 | 2014-07-16 | Across No. 0 high pressure heater system of unit backheat |
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| CN201410339773.2A CN104061564B (en) | 2014-07-16 | 2014-07-16 | Across No. 0 high pressure heater system of unit backheat |
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Cited By (5)
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| CN106122934A (en) * | 2016-07-06 | 2016-11-16 | 大唐(北京)能源管理有限公司 | A kind of across unit heat regenerative system and method |
| 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 |
| CN108240236A (en) * | 2016-12-23 | 2018-07-03 | 上海电气电站设备有限公司 | Steam turbine filling steam bleeding system and control method |
| CN112282872A (en) * | 2020-11-18 | 2021-01-29 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
| CN112833453A (en) * | 2021-01-04 | 2021-05-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | No. 0 high-voltage power supply optimization control system based on multi-data judgment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112833453A (en) * | 2021-01-04 | 2021-05-25 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | No. 0 high-voltage power supply optimization control system based on multi-data judgment |
| CN112833453B (en) * | 2021-01-04 | 2022-02-15 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | No. 0 high-voltage power supply optimization control system based on multi-data judgment |
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