A kind of steam turbine with degree of depth peak regulating function and therrmodynamic system
Technical field
The present invention relates to field of thermal power, be specially a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system.
Background technology
In current China generating capacity, fired power generating unit constitutes about 70%, generating general layout based on thermoelectricity will not change within period considerably long from now on, thermoelectricity is as the main force of generating, also it is the main peak regulation hands section in electrical network simultaneously, owing to not being specifically designed to the fired power generating unit of peak regulation, the substantially all participation peak regulation of all of fired power generating unit, in the heat supply phase, many thermal power plant unit are more had to lose peak modulation capacity, the consequence caused is, substantial amounts of 600MW on the one hand, 1000MW extra-supercritical unit needs to participate in peak regulation, the advantage that its efficiency is high can not be not fully exerted, on the other hand, deficiency due to peak load regulation network ability, substantial amounts of wind-powered electricity generation has to often abandon wind, clean energy resource wastes, investment can not get effective return.
Summary of the invention
The present invention is to solve the problems referred to above, it is provided that a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system.
The present invention adopts the following technical scheme that realization: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, synchronize automatic clutch, first thrust bearing, second thrust bearing, intermediate pressure by-pass valve, high pressure steam discharge ventilation valve, high-pressure admission regulates valve, in be pressed into steam control valve, high pressure exhaust check valve, middle pressure vapour butterfly valve, steam exhaust device, in shaft system of unit, intermediate pressure cylinder, high pressure cylinder, low pressure (LP) cylinder is sequentially connected with, and arranges synchronization automatic clutch between intermediate pressure cylinder and high pressure cylinder, is provided with the first thrust bearing at intermediate pressure cylinder steam admission side, steam admission side at high pressure cylinder is provided with the second thrust bearing, the admission end that main steam line regulates valve and high pressure cylinder by high-pressure admission connects, the exhaust steam end of high pressure cylinder is connected by high pressure exhaust check valve and the pipeline to boiler reheater, main steam line and the pipeline to boiler reheater are connected by high pressure bypass valve, the exhaust steam end of high pressure cylinder is connected by high pressure steam discharge ventilation valve and steam exhaust device, the admission end being pressed into steam control valve and intermediate pressure cylinder from the reheaing steam pipe of boiler reheater in passing through connects, the exhaust steam end of intermediate pressure cylinder is connected by the admission end of middle pressure vapour butterfly valve and low pressure (LP) cylinder, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve and low pressure (LP) cylinder, the exhaust steam end of low pressure (LP) cylinder and steam exhaust device connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve and steam exhaust device.
The present invention can also adopt the following technical scheme that realization: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high intermediate pressure cylinder, low pressure (LP) cylinder, synchronize automatic clutch, first thrust bearing, second thrust bearing, intermediate pressure by-pass valve, high-pressure admission regulates valve, in be pressed into steam control valve, high pressure exhaust check valve, middle pressure vapour butterfly valve, steam exhaust device, in shaft system of unit, high intermediate pressure cylinder and low pressure (LP) cylinder connect, synchronization automatic clutch is set between high intermediate pressure cylinder and low pressure (LP) cylinder, high pressure exhaust region at high intermediate pressure cylinder is provided with the first thrust bearing, it is provided with the second thrust bearing in the close automatic clutch side that synchronizes of low pressure (LP) cylinder, the high-pressure admission end that main steam line regulates valve and high intermediate pressure cylinder by high-pressure admission connects, the high pressure exhaust steam end of high intermediate pressure cylinder is connected by high pressure exhaust check valve and the pipeline to boiler reheater, main steam line and the pipeline to boiler reheater are connected by high pressure bypass valve, the middle pressure admission end being pressed into steam control valve and high intermediate pressure cylinder from the reheaing steam pipe of boiler reheater in passing through connects, the middle pressure exhaust steam end of high intermediate pressure cylinder is connected by the admission end of middle pressure vapour butterfly valve and low pressure (LP) cylinder, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve and low pressure (LP) cylinder, the exhaust steam end of low pressure (LP) cylinder and steam exhaust device connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve and steam exhaust device.
The present invention can also adopt the following technical scheme that realization: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, intermediate pressure by-pass valve, high pressure steam discharge ventilation valve, high-pressure admission regulates valve, in be pressed into steam control valve, high pressure exhaust check valve, middle pressure vapour butterfly valve, steam exhaust device, reheated steam temperature-decreased pressure reducer, middle pressure vapour ventilation valve, in shaft system of unit, high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder is sequentially connected with, the admission end that main steam line regulates valve and high pressure cylinder by high-pressure admission connects, the exhaust steam end of high pressure cylinder is connected by high pressure exhaust check valve and the pipeline to boiler reheater, main steam line is connected by high pressure bypass valve and the pipeline to boiler reheater, the exhaust steam end of high pressure cylinder is connected by high pressure steam discharge ventilation valve and steam exhaust device, the admission end being pressed into steam control valve and intermediate pressure cylinder from the reheaing steam pipe of boiler reheater in passing through connects, the exhaust steam end of intermediate pressure cylinder is connected by the admission end of middle pressure vapour butterfly valve and low pressure (LP) cylinder, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve and low pressure (LP) cylinder, reheaing steam pipe from boiler reheater is connected by the extraction line of reheated steam temperature-decreased pressure reducer and intermediate pressure cylinder, the exhaust steam end of intermediate pressure cylinder is connected by middle pressure vapour ventilation valve and steam exhaust device, the exhaust steam end of low pressure (LP) cylinder and steam exhaust device connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve and steam exhaust device.
Above-mentioned a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, steam exhaust device is applicable to Direct Air-cooled Unit, is condenser when suitable in wet type cooling unit and indirect air cooling unit.
The invention provides a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, during degree of depth peak regulation, high-pressure admission regulate valve and in be pressed into steam control valve close, high pressure cylinder passes through high pressure steam discharge ventilation valve evacuation, unit high pressure bypass valve and intermediate pressure by-pass valve are opened, steam from boiler is directly entered low pressure (LP) cylinder acting, maintains unit in relatively low operation of exerting oneself, reaches the purpose of unit degree of depth peak regulation.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment one.
Fig. 2 is the structural representation of embodiment two.
Fig. 3 is the structural representation of embodiment three.
In figure: 1-high pressure cylinder, 2-intermediate pressure cylinder, 3-low pressure (LP) cylinder, 4-electromotor, 5-synchronizes automatic clutch, 6-the first thrust bearing, 7-the second thrust bearing, 8-high pressure bypass valve, 9-intermediate pressure by-pass valve, 10-low voltage bypass valve, 11-high pressure steam discharge ventilation valve, 12-high-pressure admission regulates valve, is pressed into steam control valve in 13-, 14-high pressure exhaust check valve, pressure vapour butterfly valve in 15-, 16-steam exhaust device, 17-reheated steam temperature-decreased pressure reducer, pressure vapour ventilation valve in 18-, 19-extraction check valve.
Detailed description of the invention
Embodiment one: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high pressure cylinder 1, intermediate pressure cylinder 2, low pressure (LP) cylinder 3, electromotor 4, synchronize automatic clutch 5, first thrust bearing 6, second thrust bearing 7, intermediate pressure by-pass valve 9, high pressure steam discharge ventilation valve 11, high-pressure admission regulates valve 12, in be pressed into steam control valve 13, high pressure exhaust check valve 14, middle pressure vapour butterfly valve 15, steam exhaust device 16, in shaft system of unit, intermediate pressure cylinder 2, high pressure cylinder 1, low pressure (LP) cylinder 3, electromotor 4 is sequentially connected with, synchronization automatic clutch 5 is set between intermediate pressure cylinder 2 and high pressure cylinder 1, steam admission side at intermediate pressure cylinder 2 arranges the first thrust bearing 6, steam admission side at high pressure cylinder 1 arranges the second thrust bearing 7, the admission end that main steam line regulates valve 12 and high pressure cylinder 1 by high-pressure admission connects, the exhaust steam end of high pressure cylinder 1 is connected by high pressure exhaust check valve 14 and the pipeline to boiler reheater, main steam line is connected by high pressure bypass valve 8 and the pipeline to boiler reheater, the exhaust steam end of high pressure cylinder 1 is connected by high pressure steam discharge ventilation valve 11 and steam exhaust device 16, the admission end being pressed into steam control valve 13 and intermediate pressure cylinder 2 from the reheaing steam pipe of boiler reheater in passing through connects, the exhaust steam end of intermediate pressure cylinder 2 is connected by the admission end of middle pressure vapour butterfly valve 15 and low pressure (LP) cylinder 3, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve 9 and low pressure (LP) cylinder 3, exhaust steam end and the steam exhaust device 16 of low pressure (LP) cylinder 3 connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve 10 and steam exhaust device 16.
When unit is properly functioning, high pressure bypass valve 8(effect is that main steam passes through its pressure and temperature reducing, it is returned directly to boiler reheater) without high pressure cylinder, intermediate pressure by-pass valve 9(effect is that reheated steam passes through its pressure and temperature reducing, it is directly entered low pressure (LP) cylinder) without intermediate pressure cylinder, low voltage bypass valve 10(effect is that reheated steam passes through its pressure and temperature reducing, not by intermediate pressure cylinder and low pressure (LP) cylinder, it is directly entered steam exhaust device) it is in closed mode, synchronize automatic clutch 5 and be in engagement state, it is incorporated into the power networks by steam turbine drawing generator 4, it is completely the same with the steam turbine operation mode of prior art that (namely main steam enters high pressure cylinder acting, high pressure cylinder steam discharge returns to boiler reheater, reheated steam enters intermediate pressure cylinder acting, intermediate pressure cylinder steam discharge enters low pressure (LP) cylinder acting, exhaust steam enters steam exhaust device). when unit needs degree of depth peak regulation, progressively reduce boiler output, steam turbine is exerted oneself and is also gradually lowered accordingly, cylinder load is cut when what unit output was reduced to setting, first the operation of excision high pressure cylinder is completed, progressively open high pressure bypass valve, progressively close high-pressure admission and regulate valve 12 and high pressure exhaust check valve 14, open high pressure steam discharge ventilation valve 11, high pressure cylinder 1 evacuation, keep main steam pressure stable, cut and cylinder process to keep speed faster, prevent air blast friction from causing exhaust temperature of HP to raise, cause unit tripping, after having switched, high pressure rotor constant speed under vacuum conditions rotates, do not do work, air blast rubbing action is also more weak, high pressure cylinder is out of service, main steam returns to boiler reheater by high pressure bypass valve 8, after reheating, reheated steam enters intermediate pressure cylinder acting.Then boiler output is reduced further, complete the operation of excision intermediate pressure cylinder, it is pressed into steam control valve 13 and middle pressure vapour butterfly valve 15 in progressively closing, after valve closes entirely, do not had steam to do work due to intermediate pressure cylinder, synchronize automatic clutch 5 progressively to disengage, middle pressure rotor is gradually lowered rotating speed, jiggering is put into (if the band synchronizing automatic clutch transfers to making middle pressure rotor be in low speed rotation state after stationary rotor, then need not put into jiggering), intermediate pressure cylinder is out of service, progressively open intermediate pressure by-pass valve simultaneously, keep reheat pressure stable, reheated steam enters low pressure (LP) cylinder by intermediate pressure by-pass valve and continues acting, cut cylinder to have operated. depending on low pressure (LP) cylinder exhaust temperature situation, can reducing boiler output further, reduce low pressure (LP) cylinder load, when low pressure (LP) cylinder exhaust temperature allows, unit output can reduce as far as possible, to reach the purpose of degree of depth peak regulation. by the pressure and temperature reducing function of intermediate pressure by-pass valve, mating of boiler reheater outlet vapor parameter and low pressure (LP) cylinder steam inlet condition can well be realized, when unit needs increase to exert oneself, it is also possible to promote main steam and reheated steam parameter easily, in order to the input again of high pressure cylinder and intermediate pressure cylinder. when steam turbine realizes degree of depth peak regulation, it is necessary to boiler low load stable combustion, coal-powder boiler needs to arrange the steady combustion equipment such as plasma or Gasifying Small Oil Gun, and CFBB amount of stored heat is big, low-load combustion-stabilizing ability is strong, is more suitable for degree of depth peak regulation.
Embodiment two: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high intermediate pressure cylinder 1a, low pressure (LP) cylinder 3, electromotor 4, synchronize automatic clutch 5, first thrust bearing 6, second thrust bearing 7, high-pressure admission regulates valve 12, in be pressed into steam control valve 13, high pressure exhaust check valve 14, middle pressure vapour butterfly valve 15, steam exhaust device 16, in shaft system of unit, high intermediate pressure cylinder 1a, low pressure (LP) cylinder 3, electromotor 4 is sequentially connected with, synchronization automatic clutch 5 is set between high intermediate pressure cylinder 1a and low pressure (LP) cylinder 3, high pressure exhaust region at high intermediate pressure cylinder 1a arranges the first thrust bearing 6, at low pressure (LP) cylinder 3, second thrust bearing 7 is set near the side synchronizing automatic clutch 5, the high-pressure admission end that main steam line regulates valve 12 and high intermediate pressure cylinder 1a by high-pressure admission connects, the high pressure exhaust steam end of high intermediate pressure cylinder 1a is connected by high pressure exhaust check valve 14 and the pipeline to boiler reheater, main steam line is connected by high pressure bypass valve 8 and the pipeline to boiler reheater, the middle pressure admission end being pressed into steam control valve 13 and high intermediate pressure cylinder 1a from the reheaing steam pipe of boiler reheater in passing through connects, the middle pressure exhaust steam end of high intermediate pressure cylinder 1a is connected by the admission end of middle pressure vapour butterfly valve 15 and low pressure (LP) cylinder 3, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve 9 and low pressure (LP) cylinder 3, exhaust steam end and the steam exhaust device 16 of low pressure (LP) cylinder 3 connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve 10 and steam exhaust device 16.
When unit is properly functioning, high pressure bypass valve 8, intermediate pressure by-pass valve 9, low voltage bypass valve 10 are in closed mode, synchronize automatic clutch 5 and be in engagement state, steam turbine drawing generator be incorporated into the power networks, completely the same with the steam turbine operation mode of prior art. when unit needs degree of depth peak regulation, progressively reduce boiler output, steam turbine is exerted oneself and is also gradually lowered accordingly, cylinder load is cut when what unit output was reduced to setting, progressively open high pressure bypass valve 8 and intermediate pressure by-pass valve 9, progressively close high-pressure admission and regulate valve 12 and high pressure exhaust check valve 14, it is pressed into steam control valve 13 and middle pressure vapour butterfly valve 15 in progressively closing, after valve closes entirely, do not had steam to do work due to high intermediate pressure cylinder, synchronize automatic clutch 5 progressively to disengage, High inter case is gradually lowered rotating speed, jiggering is put into (if the band synchronizing automatic clutch transfers to making High inter case be in low speed rotation state after stationary rotor, then need not put into jiggering), high intermediate pressure cylinder 1a is out of service, cut cylinder to have operated, main steam returns to boiler reheater by high pressure bypass valve 8, after reheating, reheated steam enters low pressure (LP) cylinder by intermediate pressure by-pass valve 9 and continues acting, handoff procedure to keep main steam pressure and reheated steam pressure stability as far as possible.Depending on low pressure (LP) cylinder exhaust temperature situation, can reducing boiler output further, reduce low pressure (LP) cylinder load, when low pressure (LP) cylinder exhaust temperature allows, unit output can reduce as far as possible, to reach the purpose of degree of depth peak regulation.
Embodiment three: a kind of steam turbine with degree of depth peak regulating function and therrmodynamic system, including high pressure cylinder 1, intermediate pressure cylinder 2, low pressure (LP) cylinder 3, electromotor 4, high pressure steam discharge ventilation valve 11, high-pressure admission regulates valve 12, in be pressed into steam control valve 13, high pressure exhaust check valve 14, middle pressure vapour butterfly valve 15, steam exhaust device 16, reheated steam temperature-decreased pressure reducer 17, middle pressure vapour ventilation valve 18, extraction check valve 19, in shaft system of unit, high pressure cylinder 1, intermediate pressure cylinder 2, low pressure (LP) cylinder 3, electromotor 4 is sequentially connected with, the admission end that main steam line regulates valve 12 and high pressure cylinder 1 by high-pressure admission connects, the exhaust steam end of high pressure cylinder 1 is connected by high pressure exhaust check valve 14 and the pipeline to boiler reheater, main steam line is connected by high pressure bypass valve 8 and the pipeline to boiler reheater, the exhaust steam end of high pressure cylinder 1 is connected by high pressure steam discharge ventilation valve 11 and steam exhaust device 16, the admission end being pressed into steam control valve 13 and intermediate pressure cylinder 2 from the reheaing steam pipe of boiler reheater in passing through connects, the exhaust steam end of intermediate pressure cylinder 2 is connected by the admission end of middle pressure vapour butterfly valve 15 and low pressure (LP) cylinder 3, reheaing steam pipe from boiler reheater is connected by the admission end of intermediate pressure by-pass valve 9 and low pressure (LP) cylinder 3, reheaing steam pipe from boiler reheater is connected by the extraction line of reheated steam temperature-decreased pressure reducer 17 and intermediate pressure cylinder 2, the extraction line of intermediate pressure cylinder 2 connects also by extraction check valve 19 and high-pressure heater, the exhaust steam end of intermediate pressure cylinder 2 is connected by middle pressure vapour ventilation valve 18 and steam exhaust device 16, exhaust steam end and the steam exhaust device 16 of low pressure (LP) cylinder 3 connect, reheaing steam pipe from boiler reheater is connected by low voltage bypass valve 10 and steam exhaust device 16.
When unit is properly functioning, high pressure bypass valve 8, intermediate pressure by-pass valve 9, low voltage bypass valve 10, reheated steam temperature-decreased pressure reducer 17 are in closed mode, steam turbine drawing generator be incorporated into the power networks, completely the same with the steam turbine operation mode of prior art. when unit needs degree of depth peak regulation, progressively reduce boiler output, steam turbine is exerted oneself and is also gradually lowered accordingly, cylinder load is cut when what unit output was reduced to setting, first the operation of excision high pressure cylinder is completed, progressively open high pressure bypass valve 8, progressively close high-pressure admission and regulate valve 12 and high pressure exhaust check valve 14, open high pressure steam discharge ventilation valve 11, high pressure cylinder evacuation, keep main steam pressure stable, cut and cylinder process to keep speed faster, prevent air blast friction from causing exhaust temperature of HP to raise, cause unit tripping, after having switched, high pressure rotor constant speed under vacuum conditions rotates, do not do work, air blast rubbing action is also more weak, high pressure cylinder is out of service, main steam returns to boiler reheater by high pressure bypass valve, after reheating, reheated steam enters intermediate pressure cylinder acting. then boiler output is reduced further, complete the operation of excision intermediate pressure cylinder, it is pressed into steam control valve 13 and middle pressure vapour butterfly valve 15 in progressively closing, open middle pressure vapour ventilation valve 18, intermediate pressure cylinder evacuation, progressively open reheated steam temperature-decreased pressure reducer 17, cooling steam is sent into intermediate pressure cylinder from extraction line, depending on steam parameter after middle pressure stripping temperature and intermediate pressure cylinder temperature change adjustment reheated steam temperature-decreased pressure reducer, intermediate pressure cylinder is out of service, progressively open intermediate pressure by-pass valve simultaneously, keep reheat pressure stable, reheated steam enters low pressure (LP) cylinder by intermediate pressure by-pass valve and continues acting, cut cylinder to have operated. depending on low pressure (LP) cylinder exhaust temperature situation, can reducing boiler output further, reduce low pressure (LP) cylinder load, when low pressure (LP) cylinder exhaust temperature allows, unit output can reduce as far as possible, to reach the purpose of degree of depth peak regulation. by the pressure and temperature reducing function of intermediate pressure by-pass valve, mating of boiler reheater outlet vapor parameter and low pressure (LP) cylinder steam inlet condition can well be realized, when unit needs increase to exert oneself, it is also possible to promote main steam and reheated steam parameter easily, in order to the input again of high pressure cylinder and intermediate pressure cylinder.