CN103670547B - Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset - Google Patents
Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset Download PDFInfo
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- CN103670547B CN103670547B CN201310668730.4A CN201310668730A CN103670547B CN 103670547 B CN103670547 B CN 103670547B CN 201310668730 A CN201310668730 A CN 201310668730A CN 103670547 B CN103670547 B CN 103670547B
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Abstract
The invention discloses a method for enhancing the heat supply capability of a three-steam-exhaust 200MW turboset. According to the method, a movable blade of a low-pressure flowing portion arranged at the tail end in a medium-pressure cylinder is omitted, and a blocking board is used for blocking a partition board stationary blade flowing channel of the low-pressure flowing portion. A pressure regulating valve is additionally arranged on a communicating pipe between the medium-pressure cylinder and a low-pressure cylinder, and a heat supply steam extraction pipe is led out from a communicating pipe in front of the pressure regulating valve. The pressure of steam entering the steam extraction pipe is controlled by regulating the opening degree of the pressure adjusting valve, and therefore the heat supply heat extraction amount is controlled. According to the method for enhancing the heat supply capability of the three-steam-exhaust 200MW turboset, little electric energy production is consumed to obtain the good heat supply capability, the heat supply capability of the turboset can be more than 400t/h, and switching and recovery work does not need to be performed in a heat supply period and a non-heat supply period. The method for enhancing the heat supply capability of the three-steam-exhaust 200MW turboset has the advantages of being little in transformation work amount, short in transformation cycle, low in construction cost, flexible in operation, easy to adjust, reliable, stable and the like. The increasingly growing heat supply requirements are effectively and reliably met, economical efficiency is good, and practicability is high.
Description
Technical field
the present invention relates to three-exhauster 200MW steam turbine set, specifically a kind of method increasing three-exhauster 200MW steam turbine set heating ability.
Background technique
three-exhauster 200MW steam turbine set is the generating main force equipment put into operation the nineties in last century, and it has achieved the achievement attracted people's attention.But what its designing technique adopted is the designing technique fifties in last century, in contrast, designing technique falls behind, and the Economy of unit and reliability are very low.Along with national environmental protection power conservation requirement is more and more higher, high parameter, jumbo steam turbine set put into operation in succession, the steam turbine set such as such as 300MW, 600MW, 1000MW, become the generating main force of power station, three-exhauster 200MW steam turbine set is faced be eliminated, close down (upper large-sized unit has suppressed little unit) at present.Based on a large amount of existence of three-exhauster 200MW steam turbine set, and heating demands is growing, and country encourages to change this kind of pure generator set into have heating concurrently turbine LP rotors.Present stage, mainly contain cross over pipe about the transformation of three-exhauster 200MW steam turbine set heating and to draw gas mode and back pressure mode two kinds.
Wherein, the cross over pipe mode of drawing gas is that the cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder sets up modulating valve, the cross over pipe before modulating valve punches and draws heat supply extraction steam pipe (see Fig. 1).This mode controls by means of only the aperture of adjustment modulating valve the vapor pressure entering extraction steam pipe, thus controls the heat supply amount of drawing gas, and has and implements the advantages such as simple, non-heating period unit operation is unaffected.But, because end in the intermediate pressure cylinder of unit is with low pressure flow passage part, when control valve opening on cross over pipe reduces, the external heat supply of small flow steam can also play regulating action, if when the control valve opening on cross over pipe reduces further, steam then in intermediate pressure cylinder under pressure, by end in intermediate pressure cylinder with low pressure flow passage part discharge, the regulating action of modulating valve is weakened gradually, finally do not have regulating action, even if the aperture of modulating valve turns down again, the steam flow of external heat supply also cannot increase, about 150t/h can only be reached, heat capacity is very low, can not meet growing heat demand.
Back pressure mode is by the low pressure flow passage partial removal in low pressure (LP) cylinder, and replace with optical axis, namely low pressure (LP) cylinder does not do work, and only stays a small amount of cooling steam, the heat capacity of unit is maximized, reaches about 470 t/h.The heating steam of which regulates and can only carry out along with the steam change of main vapour entrance, not only there is very flexible, regulate the problems such as difficulty is large, and unit is when Heating Period and non-heating period run switching, need to do work to it operations such as level is recovered, dismounting, workload is very large, and the cycle is long, and cost is high, have impact on the power benefit of power station, very impracticable.
Summary of the invention
the object of the invention is to: for present situation and the application requirement of three-exhauster 200MW steam turbine set, and the deficiency of above-mentioned existing reforming mode, there is provided a kind of method increasing three-exhauster 200MW steam turbine set heating ability, the method has the features such as heat capacity is large, flexible operation, good economy performance.
The technical solution used in the present invention is: a kind of method increasing three-exhauster 200MW steam turbine set heating ability, described method be by end in intermediate pressure cylinder with the movable vane of low pressure flow passage part remove, and with the diaphragm nozzle runner of this low pressure flow passage part of closure plate shutoff; Cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder sets up modulating valve, the cross over pipe before modulating valve is drawn heat supply extraction steam pipe, control by the aperture adjusting modulating valve the vapor pressure entering extraction steam pipe, thus control the heat supply amount of drawing gas.
Further, described closure plate shutoff is on the first order diaphragm nozzle runner of low pressure flow passage part.
Further, described extraction steam pipe is provided with successively Decompression valves, safety valve, quick closing valve modulating valve, extraction check valve and electric gate valve.
The invention has the beneficial effects as follows: said method for three-exhauster 200MW steam turbine set present situation and application requirement, by transforming the through-flow vulnerable area of intermediate pressure cylinder, under the prerequisite affecting generated output not significantly, significantly increase heat capacity, namely to sacrifice a small amount of generated energy to obtain excellent heat capacity, make the heat capacity of unit can reach about 400 more than t/h, and Heating Period and non-heating period switch without the need to carrying out and resume work, there is transformation workload little, the transformation cycle is short, cost is low, flexible operation, regulate simple, the feature such as reliable and stable, effectively, reliably meet growing heat demand, better economy, practical.
Accompanying drawing explanation
below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is that the existing cross over pipe mode of drawing gas of three-exhauster 200MW steam turbine set heating transforms schematic diagram.
Fig. 2 is one transformation schematic diagram of the present invention.
Fig. 3 is that improved heat supply of the present invention is drawn gas schematic diagram.
Code name implication in figure: 1-high-pressure cylinder; 2-intermediate pressure cylinder; 3-low pressure (LP) cylinder; 4-cross over pipe; 5-modulating valve; 6-extraction steam pipe; 7-Decompression valves; 8-safety valve; 9-quick closing valve modulating valve; 10-extraction check valve; 11-electric gate valve.
Embodiment
see Fig. 2 and Fig. 3: a kind of method increasing three-exhauster 200MW steam turbine set heating ability, the high-pressure cylinder 1 of this three-exhauster 200MW steam turbine set and the steam of intermediate pressure cylinder 2 are all from boiler, have cross over pipe 4 between intermediate pressure cylinder 2 and low pressure (LP) cylinder 3, the steam in intermediate pressure cylinder 2 after acting is delivered in low pressure (LP) cylinder 3 by cross over pipe 4 and is done work.The method increasing heating ability for this unit specifically comprises:
According to the three-exhauster 200MW steam turbine set put into operation, collect the practical operation situation of unit, such as unit thermodynamic system, shafting stability, thrust, take out prostomium sheet intensity, non-heating operation maximum load operating mode low pressure blade, back pressure of condenser etc., and collect heat demand situation; The scheme (based on the existing published routine techniques) heating of unit run, regulates is determined according to these situations;
By end in intermediate pressure cylinder 2 with the movable vane (i.e. moving vane) of low pressure flow passage part remove, and with first order diaphragm nozzle (i.e. stator blade) runner of this low pressure flow passage part of closure plate shutoff, closure plate and diaphragm housing ring, diaphragm gland etc. form shaft end gland seal, make the shaft end seal of intermediate pressure cylinder 2, with this avoid steam under pressure from end in intermediate pressure cylinder 2 with low pressure flow passage part discharge; Cross over pipe 4 again between intermediate pressure cylinder 2 and low pressure (LP) cylinder 3 sets up modulating valve 5(and butterfly valve), cross over pipe 4 before modulating valve 5 punches and draws heat supply extraction steam pipe 6, the vapor pressure entering extraction steam pipe 6 is controlled by the aperture adjusting modulating valve 5, thus control the heat supply amount of drawing gas, aforesaid extraction steam pipe 6 is provided with Decompression valves 7, safety valve 8, quick closing valve modulating valve 9, extraction check valve 10 and electric gate valve 11 successively.
The present invention is by carrying out the transformation reducing acting level to the through-flow vulnerable area (i.e. the low pressure flow passage part of end) of intermediate pressure cylinder 2, make under the prerequisite affecting generated output not significantly, significantly increase heat capacity, namely to sacrifice a small amount of generated energy to obtain excellent heat capacity.It controls by modulating valve 5 aperture on adjustment cross over pipe 4 vapor pressure entering extraction steam pipe 6, when modulating valve 5 aperture more hour, the vapor pressure entering low pressure (LP) cylinder 3 is lower, and the vapor pressure entering extraction steam pipe 6 is higher, even if the aperture of modulating valve 5 is little again, due to end in intermediate pressure cylinder 2 with low pressure flow passage part acting level to be cancelled and shutoff, steam in intermediate pressure cylinder 2 also can not from end in intermediate pressure cylinder 2 with low pressure flow passage part discharge, the adjustment of modulating valve 5 is reliable, stable, make the heat capacity of unit can reach about 400 more than t/h, only about 60t/h fewer than back pressure machine, can effectively meet growing heat demand.
Claims (2)
1. one kind increases the method for three-exhauster 200MW steam turbine set heating ability, it is characterized in that: described method be by end in intermediate pressure cylinder with the movable vane of low pressure flow passage part remove, and with the diaphragm nozzle runner of this low pressure flow passage part of closure plate shutoff, described closure plate shutoff is on the first order diaphragm nozzle runner of low pressure flow passage part; Cross over pipe between intermediate pressure cylinder and low pressure (LP) cylinder sets up modulating valve, the cross over pipe before modulating valve is drawn heat supply extraction steam pipe, control by the aperture adjusting modulating valve the vapor pressure entering extraction steam pipe, thus control the heat supply amount of drawing gas.
2. increase the method for three-exhauster 200MW steam turbine set heating ability according to claim 1, it is characterized in that: described extraction steam pipe is provided with successively Decompression valves, safety valve, quick closing valve modulating valve, extraction check valve and electric gate valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310668730.4A CN103670547B (en) | 2013-12-11 | 2013-12-11 | Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset |
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| CN201310668730.4A CN103670547B (en) | 2013-12-11 | 2013-12-11 | Method for enhancing heat supply capability of three-steam-exhaust 200MW turboset |
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| CN103670547B true CN103670547B (en) | 2015-06-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105986849A (en) * | 2015-02-13 | 2016-10-05 | 中国电力工程顾问集团华北电力设计院有限公司 | Rear-mounted steam turbine system and method for middle steam pumping and heating |
| CN107687352A (en) * | 2017-07-03 | 2018-02-13 | 中国能源建设集团广东省电力设计研究院有限公司 | Combined cycle gas-steam turbine heating system |
| CN108060948A (en) * | 2018-01-28 | 2018-05-22 | 冯煜珵 | A kind of non-high pressure cylinder sets the steam turbine of governing stage |
| CN112412554A (en) * | 2020-11-23 | 2021-02-26 | 东方电气集团东方汽轮机有限公司 | Three-cylinder three-exhaust steam turbine capable of switching circulating water heat supply and switching method thereof |
| CN112682115B (en) * | 2020-12-18 | 2023-02-24 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS57124003A (en) * | 1981-01-27 | 1982-08-02 | Toshiba Corp | Geothermal turbine |
| CN100494642C (en) * | 2004-08-31 | 2009-06-03 | 天津市电力科技发展公司 | Method and device for controlling heat electricity linked production of condensing steam turbine with three low cylinder and three-exhauster |
| CN201671660U (en) * | 2010-05-06 | 2010-12-15 | 中国长江动力公司(集团) | Steam turbine with steam extraction being changed into back pressure type |
| CN101963075A (en) * | 2010-09-10 | 2011-02-02 | 山东泓奥电力科技有限公司 | Method for changing pure condensation into back pressure heat supply |
| CN102434222A (en) * | 2011-11-28 | 2012-05-02 | 北京北重汽轮电机有限责任公司 | Cogeneration turbine for heating and supplying heat |
| CN103016083B (en) * | 2012-12-26 | 2015-11-18 | 北京国电蓝天节能科技开发有限公司 | Back pressure pure condensate switches heating system |
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