CN203962061U - Utilize exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided - Google Patents
Utilize exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided Download PDFInfo
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- CN203962061U CN203962061U CN201420402926.9U CN201420402926U CN203962061U CN 203962061 U CN203962061 U CN 203962061U CN 201420402926 U CN201420402926 U CN 201420402926U CN 203962061 U CN203962061 U CN 203962061U
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Abstract
Utilize exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, comprise gas turbine, steam turbine, generator, described gas turbine, steam turbine, generator coaxle be arranged in series successively, also comprise the afterheat boiler system that connects described Combined Cycle Unit, described afterheat boiler system provides auxiliary steam for starting this Gas-steam Combined Cycle unit for Gas-steam Combined Cycle unit.The utility model success rate is high, utilizes exhaust heat boiler to provide auxiliary steam to start Gas-steam Combined Cycle unit starting success rate more than 99%, improves the utilization ratio of exhaust heat boiler; Energy saving, utilizes exhaust heat boiler to provide auxiliary steam to substitute startup boiler for auxiliary steam, saves a large amount of rock gas and electric weight that consume by startup boiler startup Combined Cycle Unit.
Description
[technical field]
The utility model relates to power plant's power field, particularly relates to and is applicable to utilize exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided in two-platoon system power generation process.
[background technique]
Gas-steam Combined Cycle unit has the advantages that start and stop speed is fast, peak modulation capacity is strong, by electrical network, is used as peak regulation unit, the two-shift operation mode that adopts getting up early to stop evening.Unit need to provide gland steam and low pressure (LP) cylinder cooling steam by auxiliary steam in start-up course.When unit starting is prepared, first send into gland steam and just can carry out the operation that vapour condenser is set up vacuum; Unit, before starting raising speed to 1500r/min or while shutting down rotating speed is down to 1500r/min, all needs enough low pressure (LP) cylinder cooling steams to drop into salband to walk the fricative heat of air blast of low pressure blade; Therefore, the normal operation of gland steam and low pressure (LP) cylinder cooling steam is to ensure that unit successfully starts essential condition.The startup boiler that power plant is equipped with, for the station-service auxiliary steam of unit starting process is provided, when the exhaust heat boiler of Gas-steam Combined Cycle unit produces qualified middle pressure superheated vapor, offer power plant with after Auxiliary Steam, start boiler and transfer stand-by state to.
Although it is higher to start boiler thermal output, in order still to need every year to consume upper kiloton mark coal for unit starting auxiliary steam, and these consumption do not produce direct economic benefit, are only used to Gas-steam Combined Cycle unit starting and prepare.Start boiler and be in operation and also have the existence of controlling the defects such as bad, blower fan baffle plate bite, gas baffle cracking and flame detector base shakiness because of burner, occur successively to start and normal repeatedly trip phenomenon in service.Cause in unit starting process the auxiliary steam can not normal supply for unsaturated vapor, gland steam, cause the event that is forced to startup interruption and delayed startup in unit starting process frequently to occur, affect generating electricity by way of merging two or more grid systems on time and Economy examination of unit, caused certain loss to corporate economy's benefit.
In view of above reason, in two-platoon system power generation process, need one of searching to substitute and start boiler for other approach of auxiliary steam, could change this can only dependence and start passive situation and the consumption of corresponding minimizing startup boiler energy that boiler could start unit.In two-platoon system power generation process, after unit stoppage in transit at night, generally exhaust heat boiler cuts out flue damper, carries out the heat-insulation pressure keeping operation of isolation of system with steam turbine side.The waste heat of savings after utilizing exhaust heat boiler to shut down; the auxiliary steam needing in unit outage can provide unit starting process after 6~8 hours; the passive situation that relies on startup boiler could start unit will be reversed, also the corresponding energy consumption that has reduced startup boiler.
[summary of the invention]
The utility model is intended to address the above problem and provides and be applicable in two-platoon system power generation process, with exhaust heat boiler, replaces starting boiler energy saving, with exhaust heat boiler, provides auxiliary steam to start Gas-steam Combined Cycle unit.
For achieving the above object, the utility model provides the Gas-steam Combined Cycle unit that utilizes exhaust heat boiler that auxiliary steam is provided, this Combined Cycle Unit comprises gas turbine, steam turbine, generator, described gas turbine, steam turbine, generator coaxle is arranged in series successively, also comprise afterheat boiler system, this afterheat boiler system comprises high pressure drum, middle pressure drum, high pressure evaporator, middle pressure vaporizer and middle pressure superheater, described high pressure drum, middle pressure drum connects respectively high pressure evaporator and middle pressure vaporizer, described high pressure drum, between middle pressure drum, be provided with control gear, during connecting, described middle pressure drum presses superheater, described afterheat boiler system provides auxiliary steam for starting this Gas-steam Combined Cycle unit for Gas-steam Combined Cycle unit.
Described control gear comprises at least one separating valve and modulating valve.
Described separating valve is electronic separating valve.
Described modulating valve is pneumatic control valve.
Described auxiliary steam comprises gland steam and low pressure (LP) cylinder cooling steam.
The utility model utilizes Gas-steam Combined Cycle unit that exhaust heat boiler provides auxiliary steam compared with prior art, and its beneficial effect is:
Success rate is high, utilizes exhaust heat boiler to provide auxiliary steam to start Gas-steam Combined Cycle unit starting success rate more than 99%, improves the utilization ratio of exhaust heat boiler;
Energy saving, utilizes exhaust heat boiler to provide auxiliary steam to substitute startup boiler for auxiliary steam, saves a large amount of rock gas and electric weight that consume by startup boiler startup Combined Cycle Unit.
[accompanying drawing explanation]
Fig. 1 is the utility model structural representation.
[embodiment]
The following example is to further explanation of the present utility model and explanation, and the utility model is not constituted any limitation.
As shown in Figure 1, the exhaust heat boiler that utilizes of the present utility model provides the Gas-steam Combined Cycle unit of auxiliary steam to comprise gas turbine, steam turbine, generator.Gas turbine, steam turbine, generator coaxle be arranged in series successively.Gas turbine, from ambient atmosphere environment air amount, utilizes combustion gas as the burning of working medium, and making combustion gas chemical energy Partial Conversion is mechanical work, and steam turbine is that the heat energy of high-temperature steam is converted into rotating mechanical energy.Gas-steam Combined Cycle unit also comprises afterheat boiler system, this afterheat boiler system is connected with Gas-steam Combined Cycle unit by pipeline, the steam of afterheat boiler system storage is used for starting Gas-steam Combined Cycle unit as auxiliary steam, replaces with starting boiler startup Gas-steam Combined Cycle unit.
As shown in Figure 1, afterheat boiler system comprises high pressure drum 1, middle pressure drum 2, low-pressure drum (not shown), high pressure evaporator 3, middle pressure vaporizer 4, middle pressure superheater 5 and a plurality of connecting tube.High pressure drum 1 connects high pressure evaporator 3 by pipeline, and middle pressure drum 2 is pressed vaporizer 4 in connecting by pipeline, during middle pressure drum 2 connects, presses superheater 5, through in press superheater 5 part superheated vapors to provide auxiliary steam for Combined Cycle Unit.High pressure drum 1 storage high pressure steam, high-pressure steam pressure is that 10MPa, temperature are 300-350 degree; Middle pressure drum 2 storage medium pressure steams, medium pressure steam pressure is that 2.4MPa, temperature are 250-280 degree; Low-pressure drum is used for storing low pressure steam.High pressure evaporator 3, middle pressure vaporizer 4 main with carry out heat-shift with high pressure drum 1 and middle pressure drum 2 respectively.Middle pressure superheater 5 makes the saturated vapour in middle pressure drum 2 be heated into the superheated vapor with uniform temperature, and the superheated vapor pressure after middle pressure superheater 5 is that 2MPa, temperature are 230-250 degree.Between high pressure drum 1, middle pressure drum 2, be provided with control gear, opening this control gear can make high pressure drum 1 supplement part high pressure steam to middle pressure drum 2, control gear comprises at least one separating valve and at least one modulating valve, separating valve and modulating valve are known separating valve and modulating valve, in the present embodiment, separating valve is electronic separating valve 6, and modulating valve is pneumatic control valve 7.
As shown in Figure 1, afterheat boiler system comprises gland steam and low pressure (LP) cylinder cooling steam for Gas-steam Combined Cycle unit provides auxiliary steam, and the gland steam of normal operation and low pressure (LP) cylinder cooling steam are to ensure that unit successfully starts essential condition.In unit starting condition, first vapour condenser in steam turbine is set up the operation of vacuum, therefore, when starting unit, gland steam is sent into steam turbine gland system, make the interior vacuum that forms of vapour condenser in steam turbine.Unit is before starting raising speed to 1500r/min or while shutting down rotating speed is down to 1500r/min; because blade rubbing produces heat; must take away the fricative heat of the air blast of low pressure blade in low pressure (LP) cylinder with enough cooling steams, guarantee the normal startup of unit.The part steam that middle pressure superheater 5 provides enters into the female pipe 10 of the auxiliary vapour of unit through electronic separating valve 8, pneumatic control valve 9, the female pipe 10 of the auxiliary vapour of unit is divided into pipeline 11, pipeline 12 and pipeline 13, pipeline 11 is low pressure (LP) cylinder cooling steam pipeline, pipeline 12 provides gland steam pipeline for combustion gas and steam turbine shaft seal system, and pipeline 13 is deaeration in condenser steam line.If the part steam superheating of therefrom pressing superheater 5 to provide, during excess Temperature, external condensation water is this part superheated vapor spray cooling by pipeline 14.
Working principle of the present utility model: be provided with a road saturated vapour in exhaust heat boiler high pressure drum 1 saturated vapour side and be connected to middle pressure drum 2 by electronic separating valve 6 and pneumatic control valve 7, the steam of middle pressure drum 2 through in press superheater 5 that a part of steam is provided, this part steam is used for starting Gas-steam Combined Cycle unit through electronic separating valve 8, pneumatic control valve 9 for gland steam and low pressure (LP) cylinder cooling steam.
When Combined Cycle Unit sub load or when combustion gas steam turbine, steam turbine tripping operation in service, need to provide enough auxiliary steam to carry out cooling and gland seal system for low pressure (LP) cylinder and carry out condenser vacuum operation, this situation may cause middle pressure drum 2 pressure on the low side, need to supplement a part of steam from high pressure drum 1, supplementary vapour source when excessive as medium voltage network steam producing amount deficiency or steam consumption.Open electronic separating valve 6 and pneumatic control valve 7, pneumatic control valve 7 is controlled high pressure drum 1 steam flow to middle pressure drum 2 by adjusting aperture, makes the balance and stability state of middle pressure drum 2 under demand pressure.
The utility model utilizes exhaust heat boiler to provide the Gas-steam Combined Cycle unit success rate of auxiliary steam high, utilizes exhaust heat boiler to provide auxiliary steam to start Gas-steam Combined Cycle unit starting success rate more than 99%, improves the utilization ratio of exhaust heat boiler; Energy saving, utilizes exhaust heat boiler to provide auxiliary steam to substitute startup boiler for auxiliary steam, saves a large amount of rock gas and electric weight that consume by startup boiler startup Combined Cycle Unit.
Although the utility model is disclosed by above embodiment; but protection domain of the present utility model is not limited to this; do not departing under the condition of the utility model design, the distortion that above each member is done, replacement etc. all will fall within the scope of claim of the present utility model.
Claims (5)
1. utilize exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, this Combined Cycle Unit comprises gas turbine, steam turbine, generator, described gas turbine, steam turbine, generator coaxle is arranged in series successively, it is characterized in that, also comprise the afterheat boiler system that connects described Combined Cycle Unit, this afterheat boiler system comprises high pressure drum, middle pressure drum, high pressure evaporator, middle pressure vaporizer and middle pressure superheater, described high pressure drum, middle pressure drum connects respectively high pressure evaporator and middle pressure vaporizer, described high pressure drum, between middle pressure drum, be provided with control gear, during connecting, described middle pressure drum presses superheater, described afterheat boiler system provides auxiliary steam for starting this Gas-steam Combined Cycle unit for Gas-steam Combined Cycle unit.
2. utilize as claimed in claim 1 exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, it is characterized in that, described control gear comprises at least one separating valve and modulating valve.
3. utilize as claimed in claim 2 exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, it is characterized in that, described separating valve is electronic separating valve.
4. utilize as claimed in claim 2 exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, it is characterized in that, described modulating valve is pneumatic control valve.
5. utilize as claimed in claim 1 exhaust heat boiler that the Gas-steam Combined Cycle unit of auxiliary steam is provided, it is characterized in that, described auxiliary steam comprises gland steam and low pressure (LP) cylinder cooling steam.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109780527A (en) * | 2018-12-03 | 2019-05-21 | 上海申能崇明发电有限公司 | Superheater ponding control method during a kind of starting trouble heat-insulation pressure keeping |
CN110513165A (en) * | 2019-09-04 | 2019-11-29 | 深圳万润节能有限公司 | A kind of cold, heat and electricity triple supply distributed energy resource system |
CN111255536A (en) * | 2020-01-22 | 2020-06-09 | 中国能源建设集团广东省电力设计研究院有限公司 | FCB operation method of gas-steam unit power plant |
CN113931745A (en) * | 2021-09-18 | 2022-01-14 | 华电电力科学研究院有限公司 | Waste heat boiler system of gas-steam combined cycle unit and starting method thereof |
CN114076006A (en) * | 2021-11-09 | 2022-02-22 | 国电投周口燃气热电有限公司 | Generating set intelligence opens and stops system based on APS controller |
-
2014
- 2014-07-21 CN CN201420402926.9U patent/CN203962061U/en active Active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109780527A (en) * | 2018-12-03 | 2019-05-21 | 上海申能崇明发电有限公司 | Superheater ponding control method during a kind of starting trouble heat-insulation pressure keeping |
CN110513165A (en) * | 2019-09-04 | 2019-11-29 | 深圳万润节能有限公司 | A kind of cold, heat and electricity triple supply distributed energy resource system |
CN111255536A (en) * | 2020-01-22 | 2020-06-09 | 中国能源建设集团广东省电力设计研究院有限公司 | FCB operation method of gas-steam unit power plant |
CN111255536B (en) * | 2020-01-22 | 2022-08-30 | 中国能源建设集团广东省电力设计研究院有限公司 | FCB operation method of gas-steam unit power plant |
CN113931745A (en) * | 2021-09-18 | 2022-01-14 | 华电电力科学研究院有限公司 | Waste heat boiler system of gas-steam combined cycle unit and starting method thereof |
CN113931745B (en) * | 2021-09-18 | 2023-06-16 | 华电电力科学研究院有限公司 | Waste heat boiler system of gas-steam combined cycle unit and starting method thereof |
CN114076006A (en) * | 2021-11-09 | 2022-02-22 | 国电投周口燃气热电有限公司 | Generating set intelligence opens and stops system based on APS controller |
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