CN204005936U - High-pressure heater system across unit backheat - Google Patents
High-pressure heater system across unit backheat Download PDFInfo
- Publication number
- CN204005936U CN204005936U CN201420394343.6U CN201420394343U CN204005936U CN 204005936 U CN204005936 U CN 204005936U CN 201420394343 U CN201420394343 U CN 201420394343U CN 204005936 U CN204005936 U CN 204005936U
- Authority
- CN
- China
- Prior art keywords
- unit
- super
- subcritical
- boiler
- pressure heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model discloses a kind of high-pressure heater system across unit backheat, this heating system utilizes the high-temperature steam of Subcritical Units to the feedwater heating of super (super-) critical unit, super (super-) critical unit comprises super (super-) critical boiler, super (super-) critical steam turbine high-pressure cylinder, high-pressure heater, boiler economizer and feed pump, and feed pump is carried feedwater to boiler economizer; Subcritical Units comprises Subcritical Units boiler, boiler superheater and subcritical pressure turbine high pressure cylinder, the main steam of Subcritical Units or boiler superheater intermediate extraction are communicated with high-pressure heater by jet chimney, for heating the feedwater of super (super-) critical unit.The utility model is applicable to the unit of various types, is not only confined to the unit that steam turbine is provided with filling valve interface; Have advantages of that energy consumption is low, effectiveness of regenerator is high, can effectively improve the feed temperature that enters economizer, reduced the rate that exits of unit underload denitrating system.
Description
Technical field
The utility model relates to high-pressure heater system, is specifically related to the high-pressure heater system across unit backheat.
Background technology
Existing super (super-) critical unit, when underrun with compare at full capacity, it is more that feed temperature reduces, and caused whole unit effectiveness of regenerator to decline.Simultaneously; owing to entering the feed temperature of boiler economizer, reduce; cause power plant's denitrating system when 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 > >, to environmental protection, cause certain influence.Therefore, need to improve the feed temperature that enters boiler economizer, to reduce the rate that exits of underload denitrating system.
Fig. 1 shows high-pressure heater system of the prior art.This 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, high-pressure heater 6 and high-pressure heater 7, 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 for regulating the stop valve 11 of 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, feedwater with the steam in extraction steam turbine high-pressure cylinder 3 for heater high-pressure heater, feedwater in high-pressure heater is provided by feed pump 5 and carries out deoxygenation via oxygen-eliminating device, feedwater after 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 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 not being provided with the steam-turbine unit of filling valve interface on other steam turbine high-pressure cylinders, cannot apply prior art.
(2) in prior art, need to remove the filling valve of former steam turbine configuration.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 the Steam Heating high-pressure heater 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, for the vibration of steam turbine and the safe operation of unit, produce certain impact, need steam turbine plant to adjust the stability of turbine shafting.
Utility model content
The purpose of this utility model is to provide a kind of system of high-pressure heater safely and effectively, can guarantee under the condition of unit safety operation, improve the feed temperature of unit, thereby improved 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 utility model provides a kind of high-pressure heater system across unit backheat, this 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, 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 for carry the main steam line of main steam to high pressure cylinder, between feed pump and boiler economizer, be provided with for carry the feedwater piping of feedwater to boiler economizer, for heating the vapour source of the feedwater of ultra supercritical unit or supercritical unit, come 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 for carry the subcritical main steam line of main steam to subcritical pressure turbine high pressure cylinder, between ultra supercritical unit or supercritical unit and Subcritical Units, be provided with jet chimney, Subcritical Units is connected to the 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 high-pressure heater.
Preferably, the two ends of jet chimney connect respectively the boiler superheater intergrade of high-pressure heater and Subcritical Units.
Preferably, high-pressure heater system comprises two or more high-pressure heaters, and described high-pressure heater is communicated with main steam or the boiler superheater intermediate extraction of described Subcritical Units.
Preferably, the temperature of the high-temperature steam of Subcritical Units is approximately 400 ℃～approximately 545 ℃, more preferably approximately 450 ℃～approximately 538 ℃.
Preferably, the temperature of feedwater of boiler economizer that enters ultra supercritical unit or supercritical unit is higher than approximately 280 ℃.
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 the high-pressure heater systems technology across unit backheat, in super (super-) critical unit heat regenerative system, set up high-pressure heater, utilize the main steam of Subcritical Units in power plant or the feedwater in boiler superheater intermediate extraction heating high-pressure heater, improve the feed temperature that enters boiler economizer, improved the effectiveness of regenerator of unit, improve underload denitrating system and exited rate, there is economy, efficiently, safety, the feature of environmental protection, steam turbine applicable to various types, special in the power plant that has super (super-) critical and Subcritical Units simultaneously, there is good promotion prospect.
Steam turbine across the 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, when improving unit effectiveness of regenerator, avoid the negative effect to unit safety operation, due to the raising of feed temperature, improved the rate that exits of unit denitrating system underload simultaneously, there is good environmental benefit.
This technology adopts the high-pressure heater system new technology across unit backheat, and 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, there is environmental benefit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of high-pressure heater system of the prior art;
Fig. 2 is according to the schematic diagram of the high-pressure heater system across unit backheat of the utility model the first embodiment; And
Fig. 3 is according to the schematic diagram of the high-pressure heater system across unit backheat of the utility model the second embodiment.
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 the newly-increased high-pressure heater of super (super-) critical unit.
High-pressure heater: the device that utilizes the part of steam turbine to draw gas feedwater is heated, this device is comprised of housing and piping two large divisions, on housing inner chamber top, steam condensation section is set, bottom arranges hydrophobic cooling section, and inlet tube and outlet tube top arranges feed-water inlet and gives 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 the hydrophobic cooling section in bottom, 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.
The specific embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is elaborated, so that clearer, understands the purpose of this utility model, feature and advantage.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and just for the connotation of technical solutions of the utility model is described.
Fig. 2 is according to the schematic diagram of the high-pressure heater system across unit backheat of the utility model the first embodiment.The hot vapour source that adds of the 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 for regulating the stop valve 11 ' of main steam, between main steam line 12 ' and high-pressure heater 7, be connected with jet chimney 13, thereby utilize the main steam of Subcritical Units to heat the feedwater by 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 utility model is applicable to the super (super-) critical unit of various types steam turbine.
In the art, high-pressure heater 7 so-called " No. 0 high-pressure heater ".
In a preferred embodiment, for heating the temperature of the Subcritical Units main steam of described feedwater, it is approximately 538 ℃.
Fig. 3 is according to the schematic diagram of the high-pressure heater system across unit backheat of the utility model the second embodiment.Different from the first embodiment is, in the present embodiment, the hot vapour source that adds of the 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 high-pressure heater for feedwater is heated after control valve 8, thereby improves the feed temperature that enters boiler economizer.
In a preferred embodiment, for heating the temperature of the Subcritical Units intermediate steam of described feedwater, it is approximately 450 ℃.
In Fig. 2 and Fig. 3 the difference of embodiment be 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 high-pressure heater according to unit parameter.
Number of units across the heat regenerative system mesohigh heater of the 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.
The utility model advantage
In the utility model employing power plant, the main steam of Subcritical Units or boiler superheater intermediate extraction are as the hot vapour source that adds of high-pressure heater, than drawing gas for the prior art scheme of heated feed water from steam turbine by filling valve interface, the utility model also has the following advantages:
Be applicable to the unit of various types steam turbine, be not only confined to the unit that steam turbine is provided with filling valve interface;
For the ultra supercritical unit with filling valve, when can retain 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, improved the feed temperature that enters economizer, power plant efficiency gets a promotion, be conducive to reduce coal consumption, in the utility model embodiment, power plant to 1 600MW super (super-) critical unit and 1 600MW Subcritical Units, can save approximately 3000 tons, mark coal every year;
The utility model 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 utlity model has economy, the feature such as safe, reliable, environmentally friendly, special in the power plant that has super (super-) critical and Subcritical Units simultaneously, there is good promotion prospect.High-pressure heater system across unit backheat has improved by suitable high-pressure heater vapour source the feed temperature that enters boiler economizer, reduced unit hear rate, thereby improved 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 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 utility model in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present utility model, those skilled in the art can make various changes or modifications the utility model.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (5)
1. the high-pressure heater system across unit backheat, described 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, 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 for carry the main steam line of main steam to described high pressure cylinder, between described feed pump and described boiler economizer, be provided with for carry the feedwater piping of feedwater to described boiler economizer, it is characterized in that,
For heating the vapour source of the feedwater of described ultra supercritical unit or supercritical unit, come from Subcritical Units, described Subcritical Units comprises subcritical boiler, boiler superheater and subcritical pressure turbine high pressure cylinder, is connected with for carry the subcritical main steam line of 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, described Subcritical Units is connected to the described high-pressure heater of described ultra supercritical unit or supercritical unit by described jet chimney, for heating described feedwater.
2. the high-pressure heater system across unit backheat as claimed in claim 1, is characterized in that, the two ends of described jet chimney connect respectively described subcritical main steam line and described high-pressure heater.
3. the high-pressure heater system across unit backheat as claimed in claim 1, is characterized in that, the two ends of described jet chimney connect respectively the boiler superheater intergrade of described high-pressure heater and described Subcritical Units.
4. the high-pressure heater system across unit backheat as claimed in claim 1, it is characterized in that, described high-pressure heater system comprises two or more high-pressure heaters, and described high-pressure heater is communicated with main steam or the boiler superheater intermediate extraction of described Subcritical Units.
5. the high-pressure heater system across unit backheat 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394343.6U CN204005936U (en) | 2014-07-16 | 2014-07-16 | High-pressure heater system across unit backheat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394343.6U CN204005936U (en) | 2014-07-16 | 2014-07-16 | High-pressure heater system across unit backheat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204005936U true CN204005936U (en) | 2014-12-10 |
Family
ID=52045934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420394343.6U Expired - Lifetime CN204005936U (en) | 2014-07-16 | 2014-07-16 | High-pressure heater system across unit backheat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204005936U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061564A (en) * | 2014-07-16 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | 0# high-pressure heater system with back heating crossing units |
| CN108716666A (en) * | 2018-06-20 | 2018-10-30 | 华润电力（渤海新区）有限公司 | A kind of hot purging method of super critical boiler system and system |
-
2014
- 2014-07-16 CN CN201420394343.6U patent/CN204005936U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061564A (en) * | 2014-07-16 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | 0# high-pressure heater system with back heating crossing units |
| CN108716666A (en) * | 2018-06-20 | 2018-10-30 | 华润电力（渤海新区）有限公司 | A kind of hot purging method of super critical boiler system and system |
| CN108716666B (en) * | 2018-06-20 | 2023-11-10 | 华润电力（渤海新区）有限公司 | Thermal state flushing method and system for supercritical boiler system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104061564B (en) | Across No. 0 high pressure heater system of unit backheat | |
| CN210197259U (en) | A deep peak shaving device for thermal power plant | |
| CN103790732B (en) | Medium and high temperature flue gas waste heat dual-working-medium combined cycle power generation device | |
| CN204962711U (en) | Supercritical unit or super supercritical unit do not have oxygen -eliminating device heat regenerative system | |
| CN101261002A (en) | Improvement Measures of Ultra- or Ultra-Supercritical Coal-fired Power Generation Thermal System | |
| CN104976609A (en) | Water feeding heating system capable of improving denitration effect | |
| CN106321174A (en) | Power generation system utilizing waste heat of high-temperature flue gas | |
| CN206694081U (en) | A kind of heat regenerative system for thermal power plant | |
| CN112856363A (en) | System and method for improving heat supply steam parameters of deep peak shaving heat supply unit | |
| CN113154356A (en) | High-temperature steam composite thermodynamic system and utilization method thereof | |
| CN204005936U (en) | High-pressure heater system across unit backheat | |
| CN203258631U (en) | Medium-temperature medium-pressure dual-pressure heat recovery boiler with self-deoxygenizing system | |
| CN106765039B (en) | A kind of SCR inlet flue gas water side temperature raising system and method | |
| CN113654019A (en) | System for improving low-load feed water temperature of power station boiler | |
| CN105889899A (en) | Superheated steam temperature adjusting system and method suitable for SCR low-load operation | |
| CN105627283B (en) | Steam system suitable for power station boiler with steam parameter of 700 ℃ grade and above | |
| CN108613164B (en) | A feedwater heating system to improve denitrification effect under low load | |
| CN207864014U (en) | A kind of heat regenerative system based on back pressure turbine | |
| CN214948970U (en) | High-temperature steam composite thermodynamic system | |
| CN215984014U (en) | Double-flow-process electric furnace waste heat utilization system with stable steam parameters | |
| CN105805723A (en) | Pipeline connecting system for boiler economizer of power station | |
| CN205560691U (en) | Once -through boiler with flue gas intensification system | |
| CN205957140U (en) | Heating system that heat utilization efficiency is high | |
| CN212657690U (en) | Energy-saving system utilizing energy of thermal power generating unit in starting stage | |
| CN104832227A (en) | Coal-fired unit efficient subcritical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200063 Wuning Road, Shanghai, No. 409, No. Patentee after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group Address before: 200063 Wuning Road, Shanghai, No. 409, No. Patentee before: Huabei Power Design Inst., China Power Engineering Consulting Group |