CN102410051B - Adjustment method for steam extraction and heat supply of large steam turbine - Google Patents
Adjustment method for steam extraction and heat supply of large steam turbine Download PDFInfo
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- CN102410051B CN102410051B CN201110120157.4A CN201110120157A CN102410051B CN 102410051 B CN102410051 B CN 102410051B CN 201110120157 A CN201110120157 A CN 201110120157A CN 102410051 B CN102410051 B CN 102410051B
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Abstract
The invention relates to an adjustment method for the steam extraction and the heat supply of a large steam turbine; the steam turbine is provided with two working conditions, i.e. straight condensation and steam extraction and heat supply; a steam extraction and heat supply end of the steam turbine is arranged on a reheating section pipeline between the outlet of a boiler re-heater and a medium-pressure main steam valve; two medium-pressure regulating valves are respectively arranged on two parallel reheating section pipelines; when the steam turbine is switched from a straight condensation working condition to the steam extraction and heat supply working condition, the two medium-pressure regulating valves are sequentially and gradually turned off in a steam distribution way through sequential valves, so that the steam extraction and heat supply pressure of the steam turbine is regulated. Consequently, the regulating performance of the medium-pressure regulating valves is improved, so that the pressure of the reheating section of the steam turbine is stabilized in the heat supply and steam extraction pressure scope, the stability and the safety are ensured, energy is saved and emission is reduced, and huge social and economic benefits are created.
Description
Technical field
The present invention relates to extracted steam from turbine heating field, specifically a kind of large-size steam turbine adjusting method of the extraction for heat supply of hot arc again.
Background technique
Heat supply steam-extracting type condensing steam turbine, will guarantee to supply with the needed heat of hot user on the one hand, and the while is multiple electricity again, is between non-heating period, also will take generating as main especially.Prior art, generally adopts heat supply butterfly valve (being arranged on mesolow on connecting tube), rotating barrier, seat cylinder valve etc., controls pressure and flow that heat supply is drawn gas, by, the high-temperature steam of low pressure gives user.
But, large-scale heat supply steam-extracting type condensing steam turbine, refer in particular to the heat supply steam-extracting type condensing steam turbine of 300MW and above grade, need to meet extraction pressure in the scope of 3.0MPa～4.2MPa, can also adjust extraction for heat supply, and this amount of drawing gas is larger, in original heat supply extraction regulation mode (as heat supply butterfly valve, rotating barrier, seat cylinder valve mode etc.), can not be suitable for.And, this large-size steam turbine hotter cold section or again the pressure of hot arc generally within the scope of 3.0MPa～4.2MPa, if when large (surpass boiler reheater flow 8%～10%), can cause boiler reheater overtemperature in the hot cold section amount of drawing gas again, therefore can only be from hot hot arc extraction for heat supply again.If by non-adjustment mode, after extraction for heat supply or steam turbine when underrun, then hot arc pressure can significantly reduce, and can not meet the desired pressure parameter requirement of industrial production.
Summary of the invention
The object of the invention is to: the adjusting method of taking out hot steam supply that the large-size steam turbine of a kind of 300MW of being applicable to and above grade is provided.
The technical solution adopted in the present invention is:
A kind of adjusting method of large-size steam turbine extraction for heat supply, described steam turbine has pure condensate and two kinds of operating modes of extraction for heat supply, the extraction for heat supply end of described steam turbine is arranged on boiler reheater and is exported on the reheating hot pipe between middle pressure main stop valve, and two reheat control valves are separately positioned on two reheating hot pipes arranged side by side; When described steam turbine is switched to the operation of extraction for heat supply operating mode by pure condensate operating mode, two reheat control valves adopt sequence valve distribution way of steam to cut out gradually successively, regulate extracted steam from turbine for thermal pressure.
When described steam turbine moves in pure condensate operating mode, reheat control valve moves according to throttling distribution way of steam.
When described steam turbine is switched to the operation of extraction for heat supply operating mode by pure condensate operating mode, the concrete steps of two reheat control valve sequence valve distribution way of steam are: reheat control valve 2 turns down gradually; When the aperture of reheat control valve 2 is about 50%, reheat control valve 1 starts to turn down gradually, makes when reheat control valve 2 apertures are about 0%, and reheat control valve 1 aperture is about 50%; Reheat control valve 1 continues to turn down gradually, until extraction for heat supply pressure reaches goal-setting value.
When described steam turbine is switched to the operation of pure condensate operating mode by extraction for heat supply operating mode, reheat control valve standard-sized sheet.
When described steam turbine moves in pure condensate operating mode, reach 30% rated load when above, two reheat control valve standard-sized sheets.
Described steam turbine is switched to pure condensate operating mode when operation by extraction for heat supply operating mode, closes heat supply draw gas Electric Actuated Stop Valves, heat supply extraction check valve and fast valve.
The beneficial effect that the present invention produces is:
Design philosophy of the present invention is when being switched to the operation of extraction for heat supply operating mode by pure condensate operating mode, changes the vapour method of joining of the reheat control valve of the large-size steam turbine of 300MW and above grade into order ginseng tune by throttling distribution way of steam.The adjusting method of the large-size steam turbine extraction for heat supply of exclusive reheat control valve ginseng tune is proposed, by two reheat control valve apertures, by certain overlapping degree, close successively, make hot arc pressure again maintain definite value, meet the high parameter extraction for heat supply of pressure within the scope of 3.0MPa～4.2MPa.So greatly improve the adjusting function of single reheat control valve, and guaranteed stability, the Security of the heat supply of reheat control valve ginseng tune; Reheat control valve has good flow rates characteristic, control characteristic; Propose first the concept that in adopting, pitch is adjusted for physochlaina infudibularis, broken the reheat control valve traditional idea that only ginseng is adjusted under low-load.
Accompanying drawing explanation
Fig. 1 is the large-size steam turbine hot arc heat supply schematic diagram that draws gas again;
Fig. 2 is that vapour curve is joined in the throttling of the medium-and-large-sized steam turbine reheat control valve of prior art;
Fig. 3 is the order ginseng allotment vapour curve of large-size steam turbine reheat control valve of the present invention.
Number in the figure represents: A-boiler reheater, B-high-pressure cylinder, C-intermediate pressure cylinder, the D-heat supply end that draws gas, 1-reheat control valve, 2-reheat control valve, 3-high pressure valve, H-stroke of regulating valve; Dc-modulating valve throat diameter.
Embodiment
As shown in Figures 1 to 3, heat supply steam extraction and condensing formula steam turbine is the steam turbine of simultaneously bearing for heat and generating power two generic tasks, and according to the difference of structure and the method for operation, heat supply steam turbine can be divided into back pressure type and regulate the large class of steam-extracting type two.According to the difference of hot user's character, heating steam roughly has heating to draw gas and two kinds of extractions steam for factories; According to heat supply adjustment draw gas that number of times can be divided into once, secondary and three extraction turbines.Above-mentioned unit draw gas or steam discharge has stable working pressure, for this reason, steam turbine, apart from outside speed control system, also has custom-designed voltage-regulating system.
From boiler reheater A reheated steam out, via hot arc steam tube again, arrive middle pressure main stop valve and the reheat control valve 1,2 of steam turbine both sides, then through in compress into steam pipe and enter intermediate pressure cylinder C.The heat supply of this embodiment is drawn gas and is held D to be arranged on reheating hot pipe, specifically on the reheating hot pipe between boiler reheater A and middle pressure main stop valve, before the middle pressure main vapour valve of intermediate pressure cylinder C.Heat supply is drawn gas to hold on D heat supply extraction line and is provided with Electric Actuated Stop Valves, check valve and fast valve etc., is switch and the protective gear that heat supply is drawn gas.
The regulating method that heat supply of the present invention is drawn gas, employing is arranged on two reheat control valve 1,2 sequence valve modes on reheating hot pipe arranged side by side and joins vapour control, controls the flow and the pressure that draw gas, and its adjusting function is better.Concrete steps are as follows:
When large-size steam turbine moves in pure condensate operating mode, reheat control valve 1,2 is according to throttling distribution way of steam operation, and general 30% rated load is when above, two reheat control valve 1,2 standard-sized sheets, and modulating valve, without restriction loss, does not affect the Economy of pure condensate operating mode.
Large-size steam turbine is switched to heat supply by pure condensate operating mode and draws gas operating mode when operation, and two reheat control valves 1,2 cut out successively gradually by sequence valve distribution way of steam, realize extracted steam from turbine and regulate for thermal pressure.By shown in Fig. 4 be two reheat control valves 1,2 order ginseng adjust join vapour curve, its concrete steps are: reheat control valve 2 is first to ShiShimonoseki; When the aperture of reheat control valve 2 is about 50%, reheat control valve 1, to ShiShimonoseki, makes when reheat control valve 2 apertures are about 0%, and reheat control valve 1 aperture is about 50%; Reheat control valve 1 continues to turn down gradually, until extraction for heat supply pressure reaches goal-setting value.。In reheat control valve 1,2 apertures, turn down in process, hot arc pressure can constantly raise again, adjust to again that hot arc pressure equals or during a little more than target heat supply extraction pressure value always, unlatching heat supply is drawn gas and is held the Electric Actuated Stop Valves of D, the heat supply check valve that draws gas, tape splicing heat load, adjusts exhaust point pressure to required pressure.
Large-size steam turbine is switched to pure condensate operating mode when operation by the heat supply operating mode of drawing gas, and closes heat supply draw gas Electric Actuated Stop Valves, heat supply extraction check valve, fast valve, reheat control valve 1,2 standard-sized sheets, and unit proceeds to the operation of pure condensate operating mode.
In prior art, reheat control valve 1,2 distribution way of steam of large-size steam turbine are that vapour is joined in throttling, and general control characteristic is very poor, can not implement to adjust heat supply extraction pressure.Compare with the large-size steam turbine reheat control valve 1,2 of prior art, the large-scale reheat control valve 1,2 that the present invention joins tune must have good Flow characteristics, control characteristic, can also meet steam-turbine unit AGC operation.
Experimental study proves: if adopt throttling distribution way of steam, at throttle style shown in Fig. 3, join in vapour curve, H represents stroke of regulating valve; Dc represents modulating valve throat diameter.Only have H/Dc in 0.05 ~ 0.08 scope, reheat control valve 1,2 just has good adjusting function, can not meet the demand that Practical Project is adjusted extraction pressure.If adopt sequence valve distribution way of steam, in the mode of sequence valve shown in Fig. 4, join in vapour curve, when H/Dc is in 0.05 ~ 0.18 scope, reheat control valve 1,2 has good adjusting function, can meet the demand that Practical Project is adjusted extraction pressure.
Be not difficult to find out, when reheat control valve 1,2 ginsengs are adjusted heat supply, adopt after sequence valve distribution way of steam of the present invention, control characteristic and the adjustable extent of reheat control valve 1,2 are obviously better than throttling distribution way of steam.
For under thermal condition, the power open loop of large-size steam turbine, heat supply extraction pressure and reheat control valve 1,2 form closed loop.During unit operation, first meet the needs of heat load, and the variation of the electric power that heat load causes is absorbed by electrical network itself.Be that DEH first compares setting pressure and the actual thermal pressure that supplies, proofread and correct as calculated, by correction result, remove to control heat supply regulating valve or reheat control valve 1,2, to reduce or to increase the flow after extraction stage, guarantee for thermal pressure.Specifically, when the one-level amount of drawing gas increases, one-level extraction pressure step-down, one-level affect secondary extraction pressure step-down when turning down for heat regulating valve, and secondary heat supply dish valve turns down simultaneously, and the increase of the one-level amount of drawing gas does not affect the secondary amount of drawing gas.When the secondary amount of drawing gas increases, secondary extraction pressure step-down, secondary heat supply dish valve turns down, and increases the secondary amount of drawing gas, and now one-level extraction pressure will uprise, and heat supply regulating valve is opened greatly thereupon, makes the one-level amount of drawing gas unaffected.Vice versa.
Claims (5)
1. the adjusting method of a large-size steam turbine extraction for heat supply, described steam turbine has pure condensate and two kinds of operating modes of extraction for heat supply, the extraction for heat supply end of described steam turbine is arranged on boiler reheater and is exported on the reheating hot pipe between middle pressure main stop valve, and two reheat control valves are separately positioned on two reheating hot pipes arranged side by side; It is characterized in that: when described steam turbine is switched to the operation of extraction for heat supply operating mode by pure condensate operating mode, two reheat control valves adopt sequence valve distribution way of steam to cut out gradually successively, regulate extracted steam from turbine for thermal pressure; Concrete steps are: reheat control valve 2 turns down gradually; When the aperture of reheat control valve 2 is about 50%, reheat control valve 1 starts to turn down gradually, makes when reheat control valve 2 apertures are about 0%, and reheat control valve 1 aperture is about 50%; Reheat control valve 1 continues to turn down gradually, until extraction for heat supply pressure reaches goal-setting value.
2. the adjusting method of large-size steam turbine extraction for heat supply according to claim 1, is characterized in that: when described steam turbine moves in pure condensate operating mode, reheat control valve moves according to throttling distribution way of steam.
3. the adjusting method of large-size steam turbine extraction for heat supply according to claim 1, is characterized in that: when described steam turbine is switched to the operation of pure condensate operating mode by extraction for heat supply operating mode, and reheat control valve standard-sized sheet.
4. the adjusting method of large-size steam turbine extraction for heat supply according to claim 2, is characterized in that: when described steam turbine moves in pure condensate operating mode, reach 30% rated load when above, two reheat control valve standard-sized sheets.
5. the adjusting method of large-size steam turbine extraction for heat supply according to claim 3, is characterized in that: when described steam turbine is switched to the operation of pure condensate operating mode by extraction for heat supply operating mode, close heat supply draw gas Electric Actuated Stop Valves, heat supply extraction check valve and fast valve.
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| CN201110120157.4A CN102410051B (en) | 2011-05-11 | 2011-05-11 | Adjustment method for steam extraction and heat supply of large steam turbine |
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| CN201110120157.4A CN102410051B (en) | 2011-05-11 | 2011-05-11 | Adjustment method for steam extraction and heat supply of large steam turbine |
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| CN102410051B true CN102410051B (en) | 2014-07-16 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104074561B (en) * | 2014-06-03 | 2015-07-15 | 国家电网公司 | Throttling adjusting system of cogeneration turbine unit and method of ordering power by heat |
| CN107120147B (en) * | 2017-04-17 | 2023-04-18 | 华电电力科学研究院有限公司 | Variable-load thermal power plant industrial heat supply energy-saving structure and adjusting method thereof |
| CN108826437B (en) * | 2018-05-14 | 2021-06-29 | 冉启发 | Multi-machine steam extraction and heat supply control device and use method |
| CN113266435B (en) * | 2021-07-02 | 2023-06-06 | 华北电力科学研究院有限责任公司 | Method and device for adjusting high discharge pressure by medium-pressure regulating door |
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| US4320625A (en) * | 1980-04-30 | 1982-03-23 | General Electric Company | Method and apparatus for thermal stress controlled loading of steam turbines |
| CN1039466A (en) * | 1988-07-11 | 1990-02-07 | 西屋电气公司 | Force down the modulating valve characteristic curve to improve the method for turbine efficiency |
| US6305398B1 (en) * | 1997-05-09 | 2001-10-23 | Siemens Aktiengesellschaft | Valve configuration and method for heating a valve configuration |
| CN201696101U (en) * | 2010-06-12 | 2011-01-05 | 中国电力工程顾问集团华东电力设计院 | Full admission steam turbine generator unit |
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2011
- 2011-05-11 CN CN201110120157.4A patent/CN102410051B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4320625A (en) * | 1980-04-30 | 1982-03-23 | General Electric Company | Method and apparatus for thermal stress controlled loading of steam turbines |
| CN1039466A (en) * | 1988-07-11 | 1990-02-07 | 西屋电气公司 | Force down the modulating valve characteristic curve to improve the method for turbine efficiency |
| US6305398B1 (en) * | 1997-05-09 | 2001-10-23 | Siemens Aktiengesellschaft | Valve configuration and method for heating a valve configuration |
| CN201696101U (en) * | 2010-06-12 | 2011-01-05 | 中国电力工程顾问集团华东电力设计院 | Full admission steam turbine generator unit |
Non-Patent Citations (2)
| Title |
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| 600MW亚临界汽轮机顺序阀配汽方式投运;李强等;《电站系统工程》;中国知网数字出版社《中国学术期刊（数字版）》电子杂志社;20080315;第24卷(第2期);第55，60页 * |
| 李强等.600MW亚临界汽轮机顺序阀配汽方式投运.《电站系统工程》.中国知网数字出版社《中国学术期刊（数字版）》电子杂志社,2008,第24卷(第2期),全文. |
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