CN104121572A - 1000MW stage secondary reheating unit single-row high-pressure heater system - Google Patents
1000MW stage secondary reheating unit single-row high-pressure heater system Download PDFInfo
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- CN104121572A CN104121572A CN201410381041.XA CN201410381041A CN104121572A CN 104121572 A CN104121572 A CN 104121572A CN 201410381041 A CN201410381041 A CN 201410381041A CN 104121572 A CN104121572 A CN 104121572A
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Abstract
The invention discloses a 1000MW stage secondary reheating unit single-row high-pressure heater system. The system comprises a plurality of high-pressure heaters which are connected in series in sequence through a water supply pipeline, and water evacuating openings of the high-pressure heaters are connected in series in sequence. The water supply pipeline, a steam bleeding pipeline and a heater water evacuating pipeline of the system are respectively in one row; compared with a two-row high pressure heaters, the system is simple, the number of pipelines is reduced, the number of valves in the pipeline system is reduced, thermotechnical measuring points are simple, control is easy to perform, running control is convenient to perform, the steam bleeding pipelines and the water supply pipelines of the high-pressure heaters are short, resistance is small, the 1000MW stage secondary reheating unit single-row high-pressure heater system is also favorable for reducing the heat rate of a steam turbine, single-side operation can not be achieved by the two-row high pressure heaters, and technically, the single-row high-pressure heaters have obvious advantages.
Description
Technical field
The present invention relates to a kind of Regenerative Systems of Fossil Fired Power Sets, particularly relate to the single-row high-pressure heater system of a kind of 1000MW level double reheat unit.
Background technology
High-pressure heater is the key equipment of Regenerative Systems of Fossil Fired Power Sets, plays an important role improving generatine set heat efficiency.At present, building 1000MW grade double reheat unit and all adopting the allocation plan of biserial high-pressure heater, for 1000MW double reheat unit, high-pressure heater increases to 4 grades by 3 grades, also be provided with 2 preposition steam condensers, as adopt biserial high-pressure heater, system is established level Four biserial 50% capacity, horizontal, double-flow high-pressure heater, wherein No. 2, No. 4 high-pressure heater forward type steam condenser is connected on respectively after No. 1 high-pressure heater of every row, and such unit heat regenerative system always has 10 hyperbaric heating equipment.Like this, every grade of extraction line need enter respectively two heaters arranged side by side, and feedwater piping also needs to access respectively, high-pressure heater normal, accident drain nozzle quantity is many.Such system is quite complicated, pipeline, valve One's name is legion, and operation maintenance difficulty is large.
The biserial high-pressure heater of conventional 1000MW unit can single-rowly excise, single-row operation.But double reheat biserial high-pressure heater is because the setting of No. 2, No. 4 preposition steam condensers has brought new problem, due to 1 steam condenser corresponding be two high-pressure heaters, after single high-pressure heater fault, two row high-pressure heaters all need excision.For example, after wherein a side high-pressure heater excises, corresponding steam condenser excises simultaneously, at this moment if do not excised the high-pressure heater of opposite side, the throttle (steam) temperature of No. 4 high-pressure heaters will reach 550 DEG C, and No. 4 former designs of high-pressure heater case material are the vapor (steam) temperatures meeting after preposition steam condenser cooling, and cannot bear the vapor (steam) temperature after preposition steam condenser excision, thereby need to excise the high-pressure heater of opposite side.
As can be seen here, the scheme of the large bypass of composition of the preposition steam condenser of current this biserial high-pressure heater band cannot realize one-sided operation, if when any one high-pressure heater fault, two row high-pressure heaters all will be considered excision, the increase of high-pressure heater quantity has simultaneously caused the increase of trouble point, and the risk of high-pressure heater excision strengthens relatively.
Summary of the invention
Object of the present invention is just to provide the single-row high-pressure heater system of a kind of 1000MW level double reheat unit, and effectively simplied system structure reduces high-pressure heater excision risk.
Object of the present invention realizes by following technical proposals:
The single-row high-pressure heater system of a kind of 1000MW level double reheat unit, is characterized in that: comprise multiple high-pressure heaters of connecting successively by supply line, and the drain port of high-pressure heater is connected successively.
As preferably, described high-pressure heater has four, be respectively first to fourth high-pressure heater, the feed-water inlet of the 4th high-pressure heater is connected with feed pump outlet by supply line, press the feed-water inlet of heater to be connected to water out and third high, third high is pressed being connected with the feed-water inlet of the second high-pressure heater to water out of heater, the water out of giving of the second high-pressure heater is connected with the feed-water inlet of the first high-pressure heater, being connected with boiler by supply line to water out of the first high-pressure heater, the hydrophobic outlet of the first high-pressure heater is connected with the hydrophobic import of the second high-pressure heater, the hydrophobic outlet of the second high-pressure heater presses the hydrophobic import of heater to be connected with third high, third high presses the hydrophobic outlet of heater to be connected with the hydrophobic import of the 4th high-pressure heater, the hydrophobic outlet of the 4th high-pressure heater is connected with oxygen-eliminating device.
As preferably, 2 steam condensers in parallel on the first high-pressure heater feedwater export pipeline, one of them steam condenser venthole is connected with the import of drawing gas of the second high-pressure heater, and another steam condenser venthole is connected with the import of drawing gas of the 4th high-pressure heater.
As preferably, on pipeline outside the 4th high-pressure heater feed-water inlet, triple valve one is installed, the first high-pressure heater is to being provided with triple valve two on the pipeline outside water out, triple valve one is connected by pipeline with triple valve two, and on pipeline, power set is installed.
Compared with prior art, beneficial effect of the present invention is: this system feedwater piping, draw gas and heater condensate pipeline is single channel, biserial is high relatively adds, system is simple, pipeline reduces, in piping, valve reduces, thermal technology's measuring point and control are relatively simple, it is relatively convenient that operation is controlled, the bleed steam pipework of each high-pressure heater and supply line are relatively short, and resistance is less, also beneficial to steam turbine hear rate, and biserial high-pressure heater also cannot realize one-sided operation, with the obvious advantage from the single-row high-pressure heater of technology.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
As shown in Figure 1, the single-row high-pressure heater system of a kind of 1000MW level double reheat unit, comprise four high-pressure heaters of connecting successively by supply line, and the drain port of high-pressure heater is connected successively.
Described four high-pressure heaters are respectively first to fourth high-pressure heater 1～4, the feed-water inlet A of the 4th high-pressure heater 4 is connected with feed pump outlet by supply line, press the feed-water inlet A of heater 3 to be connected to water out B and third high, third high is pressed being connected with the feed-water inlet A of the second high-pressure heater 2 to water out B of heater 3, the water out B that gives of the second high-pressure heater 2 is connected with the feed-water inlet A of the first high-pressure heater 1, the water out B that gives of the first high-pressure heater 1 is connected with boiler by supply line, the hydrophobic outlet D of the first high-pressure heater 1 is connected with the hydrophobic import C of the second high-pressure heater 2, the hydrophobic outlet D of the second high-pressure heater 2 presses the hydrophobic import C of heater 3 to be connected with third high, third high presses the hydrophobic outlet D of heater 3 to be connected with the hydrophobic import C of the 4th high-pressure heater 4, the hydrophobic outlet D of the 4th high-pressure heater 4 is connected to oxygen-eliminating device.
Give 2 steam condensers 5 in parallel on water out B pipeline at the first high-pressure heater 1, one of them steam condenser 5 venthole E is connected with the import F that draws gas of the second high-pressure heater 2, and another steam condenser 5 venthole E are connected with the import F that draws gas of the 4th high-pressure heater 4.
On pipeline outside the 4th high-pressure heater 4 feed-water inlet A, triple valve 1 is installed, on the pipeline that the first high-pressure heater 1 is given outside water out B, triple valve 27 is installed, triple valve 1 is connected by pipeline with triple valve 27, and on pipeline, power set is installed.
Its course of work is as follows:
Fed water to the 4th high-pressure heater by feed pump, water is successively through the 4th, the 3rd, second, be divided into three tunnels after the first high-pressure heater, and the first via is directly delivered to boiler, and the second road and Third Road are all by being delivered to boiler again after steam condenser.The first to fourth section of high temperature of the corresponding formation of import that draws gas by first to fourth high-pressure heater draws gas, utilize high-temperature steam to heat water, and the condensed water that in the first high-pressure heater, high-temperature steam forms is delivered in the second high-pressure heater and recycles, and together with the condensed water forming with high-temperature steam in the second high-pressure heater, be delivered to third high and press in heater, in mixing third high pressure heater, form condensed water and be delivered to together the 4th high-pressure heater, finally export oxygen-eliminating device to from the hydrophobic outlet of the 4th high-pressure heater.
In the time of arbitrary high-pressure heater fault, all high-pressure heaters all exit from system, and feedwater is switched to feed water by-pass operation fast by triple valve one and triple valve two, and unit still can be with rated load operation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. the single-row high-pressure heater system of 1000MW level double reheat unit, is characterized in that: comprise multiple high-pressure heaters of connecting successively by supply line, and the drain port of high-pressure heater is connected successively.
2. the single-row high-pressure heater system of 1000MW level double reheat unit according to claim 1, it is characterized in that: described high-pressure heater has four, be respectively first to fourth high-pressure heater, the feed-water inlet of the 4th high-pressure heater is connected with feed pump outlet by supply line, press the feed-water inlet of heater to be connected to water out and third high, third high is pressed being connected with the feed-water inlet of the second high-pressure heater to water out of heater, the water out of giving of the second high-pressure heater is connected with the feed-water inlet of the first high-pressure heater, being connected with boiler by supply line to water out of the first high-pressure heater, the hydrophobic outlet of the first high-pressure heater is connected with the hydrophobic import of the second high-pressure heater, the hydrophobic outlet of the second high-pressure heater presses the hydrophobic import of heater to be connected with third high, third high presses the hydrophobic outlet of heater to be connected with the hydrophobic import of the 4th high-pressure heater, the hydrophobic outlet of the 4th high-pressure heater is connected with oxygen-eliminating device.
3. the single-row high-pressure heater system of 1000MW level double reheat unit according to claim 2, it is characterized in that: 2 steam condensers in parallel on the first high-pressure heater feedwater export pipeline, one of them steam condenser venthole is connected with the import of drawing gas of the second high-pressure heater, and another steam condenser venthole is connected with the import of drawing gas of the 4th high-pressure heater.
4. according to the single-row high-pressure heater system of 1000MW level double reheat unit described in claim 1 or 2 or 3, it is characterized in that: on the pipeline outside the 4th high-pressure heater feed-water inlet, triple valve one is installed, the first high-pressure heater is to triple valve two is installed on the pipeline outside water out, triple valve one is connected by pipeline with triple valve two, and on pipeline, power set is installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410381041.XA CN104121572A (en) | 2014-08-05 | 2014-08-05 | 1000MW stage secondary reheating unit single-row high-pressure heater system |
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| CN201410381041.XA CN104121572A (en) | 2014-08-05 | 2014-08-05 | 1000MW stage secondary reheating unit single-row high-pressure heater system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871104A (en) * | 2016-09-12 | 2017-06-20 | 中国电力工程顾问集团华东电力设计院有限公司 | The high-pressure heater control system and its control method of double reheat fired power generating unit |
| CN108167806A (en) * | 2017-12-26 | 2018-06-15 | 中国能源建设集团江苏省电力设计院有限公司 | Million unit high-pressure heater system structure of double reheat and its application method |
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| CN202546728U (en) * | 2012-01-17 | 2012-11-21 | 浙江省电力设计院 | External tandem type steam cooler in heat regenerative system of large thermal power plant |
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| CN203395904U (en) * | 2013-04-19 | 2014-01-15 | 冯伟忠 | Improved gradual-flow type high-pressure heater drainage system |
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| CN106871104A (en) * | 2016-09-12 | 2017-06-20 | 中国电力工程顾问集团华东电力设计院有限公司 | The high-pressure heater control system and its control method of double reheat fired power generating unit |
| CN108167806A (en) * | 2017-12-26 | 2018-06-15 | 中国能源建设集团江苏省电力设计院有限公司 | Million unit high-pressure heater system structure of double reheat and its application method |
| CN108167806B (en) * | 2017-12-26 | 2019-08-09 | 中国能源建设集团江苏省电力设计院有限公司 | Million unit high-pressure heater system structure of double reheat and its application method |
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Address after: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Address before: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
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Free format text: CORRECT: APPLICANT; FROM: SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION TO: CHINA POWER ENGINEERING CONSULTING GROUP SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD. |
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Application publication date: 20141029 |