CN103485849A - Thermodynamic system of backpressure steam extraction small turbine which is coaxial with double reheating main turbine - Google Patents
Thermodynamic system of backpressure steam extraction small turbine which is coaxial with double reheating main turbine Download PDFInfo
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Abstract
The invention discloses a thermodynamic system of a backpressure steam extraction small turbine which is coaxial with a double reheating main turbine. A double reheating main turbine set is provided with a super-high pressure cylinder, a high-pressure cylinder, a moderate-pressure cylinder, a low-pressure cylinder, a single reheating device and a double reheating device. The thermodynamic system of the backpressure steam extraction small turbine comprises a backpressure steam extraction small turbine, a backpressure steam extraction small turbine steam inlet pipe system, a backpressure steam extraction small turbine steam extraction pipe system, a backpressure steam extraction small turbine steam exhausting pipe system, a backpressure steam extraction small turbine steam extraction heat returning device and a backpressure steam extraction small turbine steam exhausting heat returning device. The backpressure steam extraction small turbine steam inlet pipe system is communicated with steam, which is to be reheated, of the double reheating main turbine. The steam, which is to be reheated, of the double reheating main turbine set serves as a steam source to drive the backpressure steam extraction small turbine. The backpressure steam extraction small turbine and the double reheating main turbine are coaxially arranged. The thermodynamic system of the backpressure steam extraction small turbine can reduce manufacturing cost of the thermodynamic system and meanwhile, improve the thermodynamic cycle efficiency.
Description
Technical field
The present invention is applicable to the Double reheat steam turbine generator set, is specifically related to back pressure in the Double reheat steam turbine group small turbine thermodynamic system of drawing gas.
Background technique
Adopt the thermal power plant of double reheat technology, its re-heating subsystem is, the steam of having done the part merit in main steam turbine is drawn again and heated, and then draws the back-steam turbine and continues acting, to improve thermodynamic system efficiency.
Adopt the firepower electrical plant of double reheat technology, usually also configure heat regenerative system, the heat drawn gas with main steam turbine comes heat-setting water and feedwater by heater, by the heat drawn gas, all is recovered in working-medium water, reduce the latent heat of vaporization discharge that circulating water is taken away, to improve thermodynamic system efficiency.
The best degree of superheat of drawing gas is low, by superheat section energy acting, and latent heat of vaporization portion of energy is used for to backheat.But to the thermal power plant of re-heating subsystem is arranged, then drawing gas after heat be subject to reheating effect, temperature improves, and the degree of superheat increases thereupon, makes the energy that can be used to acting be used for heat-setting water and feedwater, has affected the efficiency of thermodynamic cycle.Simultaneously, for thermal parameter is higher again unit (as reheat steam temperature more than 620 ℃), then the extraction temperature after heat is high, needs to promote the material rate of extraction line, valve, heater, has improved the manufacture cost of pipeline, valve and equipment.
Fig. 1 is the existing double reheat main frame thermodynamic system of drawing gas, wherein steam turbine ultra-high pressure cylinder 7 steam discharges cause single reheat device 12, carry out heat temperature raising, then enter steam turbine high-pressure cylinder 8, be provided with an extraction opening in the middle of steam turbine high-pressure cylinder 8, draw steam from this extraction opening, by heater 23 heat-setting water and feedwater, reclaim the latent heat of vaporization.Steam turbine high-pressure cylinder 8 steam discharges cause secondary reheater 13, carry out heat temperature raising, then enter Steam Turbine Through IP Admission 9, be provided with an extraction opening in the middle of Steam Turbine Through IP Admission 9, draw steam from this extraction opening, by heater 20 heat-setting water and feedwater, reclaim the latent heat of vaporization, from improving efficiency of thermal cycle.Simultaneously, the steam discharge of ultra-high pressure cylinder 7, high-pressure cylinder 8 and intermediate pressure cylinder 9 is respectively by heater 22, heater 24 and heater 21 heated feed waters or water of condensation or supply with other users.But once with double reheat after the temperature of drawing gas all higher, the degree of superheat is large, the energy of superheat section also is used to heating water with the latent heat of vaporization, affects efficiency of thermal cycle.
Summary of the invention
The present invention is directed to the existing above-mentioned situation of thermodynamic system, utilize the front steam of heat again, drive the back pressure small turbine that draws gas, from small turbine, draw gas, utilize the small turbine that the degree of superheat is lower to draw gas and steam discharge, come heat-setting water and feedwater by heater, compare with existing thermodynamic system, can improve efficiency of thermal cycle.And significantly reduced the steam flow that enters single reheat device and/or secondary reheater, reduce the heat exchange area of reheater, thereby significantly reduce the cost of re-heating subsystem.
On this basis, back pressure is drawn gas small turbine and main steam turbine is coaxially arranged.For feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, separately establish condensed steam type small turbine and drive feed water pump, can effectively solve back pressure vapour amount, the electric quantity balancing problem that small turbine directly drives feed water pump (or other driven devices) to bring of drawing gas.
According to an aspect of the present invention, the invention provides the coaxially arranged back pressure of a kind of and the double reheat main steam turbine small turbine thermodynamic system of drawing gas, double reheat main steam turbine group is provided with ultra-high pressure cylinder, high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and single reheat device and secondary reheater, the described back pressure small turbine thermodynamic system of drawing gas comprises the back pressure small turbine that draws gas, the back pressure small turbine admission piping that draws gas, the back pressure small turbine extraction steam pipeline that draws gas, back pressure small turbine exhaust steam pipeline and back pressure small turbine backheat equipment and the back pressure small turbine steam discharge backheat equipment that draws gas that draws gas that draws gas that draws gas, it is characterized in that:
The described back pressure vapor communication before the heat again of small turbine admission piping and described double reheat main steam turbine group of drawing gas, utilize described double reheat main steam turbine group again the steam before heat as the vapour source, drive the described back pressure small turbine that draws gas; And
Described back pressure draw gas small turbine and described double reheat main steam turbine coaxially arranged.
In one preferred embodiment, this back pressure small turbine vapour source of drawing gas is ultra-high pressure cylinder steam discharge and/or high-pressure cylinder steam discharge.
In another preferred embodiment, this back pressure small turbine vapour source of drawing gas is that ultra-high pressure cylinder draws gas and/or high-pressure cylinder draws gas.
In another preferred embodiment, the middle heating steam that small turbine vapour source is single reheat device and/or secondary reheater of drawing gas of this back pressure.
In another preferred embodiment, this back pressure small turbine that draws gas can divide cylinder with the double reheat main steam turbine.
In another preferred embodiment, this back pressure small turbine that draws gas can close cylinder with high-pressure cylinder and/or intermediate pressure cylinder.
In another preferred embodiment, this back pressure small turbine that draws gas can be connected with the double reheat main steam turbine by gearbox.
In another preferred embodiment, two back pressures small turbine that draws gas can be set, use respectively before single reheat before steam and double reheat steam as the vapour source.
Preferably, back pressure draw gas the drawing gas of small turbine, steam discharge is guided to heater, oxygen-eliminating device, or guides to other regenerator, Auxiliary Steam or heat supply network.
Preferably, back pressure small turbine backheat equipment and the back pressure small turbine steam discharge backheat equipment that draws gas that draws gas that draws gas is single-row 100% capacity heater, or biserial 50% capacity heater.
Preferably, back pressure the drawing gas of small turbine of drawing gas is 1 grade or 2 grades, or more than 2 grades.
The back pressure of the present invention small turbine thermodynamic system of drawing gas can reduce system cost, improves efficiency of thermal cycle simultaneously.
The accompanying drawing explanation
Fig. 1 is the draw gas system flow chart of thermodynamic system of existing double reheat main frame.
Fig. 2～6th, illustrate and use steam before single reheat as back pressure the draw gas system flow chart of small turbine thermodynamic system of the back pressure in small turbine vapour source that draws gas.
Fig. 7～11st, illustrate and use steam before double reheat as back pressure the draw gas system flow chart of small turbine thermodynamic system of the back pressure in small turbine vapour source that draws gas.
Figure 12～16th, illustrate according to twin shaft pattern double reheat unit of the present invention with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine, wherein the back pressure small turbine that draws gas is used before single reheat steam as the back pressure small turbine vapour source of drawing gas.
Figure 17～21st, illustrate according to twin shaft pattern double reheat unit of the present invention with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine, wherein the back pressure small turbine that draws gas is used before double reheat steam as the back pressure small turbine vapour source of drawing gas.
Figure 22～26 illustrate two back pressures small turbine that draws gas are set, use respectively before single reheat steam before steam and double reheat as back pressure draw gas small turbine vapour source with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present invention is elaborated, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and just for the connotation of technical solution of the present invention is described.
Hot again: as the steam of having done the part merit in steam turbine to be drawn again and heated, then draw the back-steam turbine and continue acting.This mode is called heat again.By reasonably hot again, can reduce exhaust steam moisture, improve efficiency of thermal cycle.
Back pressure turbine: steam discharge is to the steam turbine higher than atmospheric piping or heat exchanger.
Condensing steam turbine: steam discharge is to the steam turbine of subatmospheric vacuum vapour condenser.
Draw gas: the intergrade from turbine discharge is extracted steam out.
Coaxially arranged: the high, medium and low cylinder pressure of small turbine and main steam turbine is distributed in same axle and is.Coaxially arranged pattern has: small turbine divides cylinder, small turbine to close cylinder, small turbine is used gearbox to be connected with main steam turbine.Small turbine divides cylinder, small turbine and high-pressure cylinder or intermediate pressure cylinder to close cylinder, small turbine is used gearbox to be connected with main steam turbine.
In general, the double reheat unit can be divided into single shaft pattern double reheat unit and twin shaft pattern double reheat unit.Below in conjunction with accompanying drawing, respectively the back pressure of the single shaft pattern double reheat unit of the present invention back pressure of small turbine thermodynamic system and the twin shaft pattern double reheat unit small turbine thermodynamic system of drawing gas of drawing gas is described in detail.
The coaxially arranged back pressure of the present invention small turbine thermodynamic system of drawing gas is the part of steamer generating circulation system.Particularly, steamer generating circulation system comprises the back pressure coaxially arranged with the double reheat main steam turbine draw gas small turbine thermodynamic system, ultra-high pressure cylinder 7, high-pressure cylinder 8, intermediate pressure cylinder 9, low pressure (LP) cylinder 10, vapour condenser 11 and single reheat device 12 and secondary reheater 13.
With the draw gas system of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine, by following major component, formed: back pressure small turbine, back pressure small turbine admission piping, back pressure small turbine extraction steam pipeline, back pressure small turbine exhaust steam pipeline, back pressure small turbine backheat equipment and the back pressure small turbine steam discharge backheat equipment that draws gas that draws gas that draws gas that draws gas that draws gas that draws gas that draws gas.Wherein, back pressure draw gas the small turbine thermodynamic system utilize double reheat main steam turbine group again the steam before heat as the vapour source, drive the back pressure small turbine that draws gas, back pressure is drawn gas drawing gas of small turbine and steam discharge for heated feed water and water of condensation.Back pressure draw gas small turbine and the double reheat main steam turbine coaxially arranged.
Fig. 2～11 illustrate according to single shaft pattern double reheat unit of the present invention with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine.Wherein, Fig. 2～6 illustrate and use steam before single reheat as the back pressure back pressure in the small turbine vapour source small turbine thermodynamic system of drawing gas of drawing gas.As shown in Fig. 2～6, system flow is as follows: steam (comprises that low-temperature primary reheated steam is (as Fig. 2, shown in 5), steam turbine ultra-high pressure cylinder level is drawn gas (as shown in Figure 3), in the middle of boiler single reheat, heating steam is (as Fig. 4, shown in 6) etc. the vapour source) enter the back pressure small turbine 1 that draws gas by the back pressure small turbine admission piping 2 that draws gas, steam drives the back pressure small turbine 1 that draws gas and rotates, the back pressure small turbine that draws gas draws gas and enters backheat equipment 5(by extraction steam pipeline 3 and comprise heater and/or oxygen-eliminating device 5a, 5b, the backheat equipment such as 5c) or heat supply give hot user, the back pressure small turbine quantity of drawing gas of drawing gas can be 1, 2, 3 and more than, the back pressure small turbine steam discharge that draws gas enters backheat equipment 6(by exhaust steam pipeline 4 and comprises the backheat equipment such as heater and/or oxygen-eliminating device 6a) or heat supply to hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
The back pressure small turbine that draws gas can divide cylinder to arrange or use gearbox to be connected with main steam turbine with main steam turbine, as shown in Fig. 2～4.Perhaps, draw gas small turbine and main steam turbine high-pressure cylinder of back pressure closes cylinder and arranges, as shown in Fig. 5～6.Small turbine vapour source can be that ultra-high pressure cylinder steam discharge, ultra-high pressure cylinder draw gas, the middle heating steam of boiler single reheat.In Fig. 2～6, the back pressure small turbine 1 that draws gas is provided with 3 grades of extraction openings, supporting 3 road extraction steam pipelines, corresponding 3 grades of backheat equipment, small turbine draw gas quantity can be also 1,2 or more than.In each embodiment shown in the drawings, backheat equipment is single-row 1 100% capacity heater, and still, backheat equipment also can adopt 2 50% capacity patterns of biserial.
Above-mentioned back pressure is drawn gas in the small turbine thermodynamic system, for feed water pump, is electronic unit, and the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, consider to retain conventional condensed steam type small turbine and drive the feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat again is provided not to backheat equipment (or hot user), than the back pressure small turbine that drives other power equipments, do not establish small turbine exhaust steam flow balance piping and small turbine and start exhaust steam pipeline, system is comparatively simple.
Fig. 7～11 illustrate uses steam before double reheat as the back pressure back pressure in the small turbine vapour source small turbine thermodynamic system of drawing gas of drawing gas.As shown in Fig. 7～11, system flow is as follows: steam (comprises low temperature double reheat steam (as shown in Fig. 7 and 10), the steam turbine high-pressure cylinder level is drawn gas (as shown in Figure 8), boiler secondary is hankered the vapour sources such as a heating steam (as shown in Fig. 9 and 11) again) enter the back pressure small turbine 1 that draws gas by the back pressure small turbine admission piping 2 that draws gas, steam drives the back pressure small turbine 1 that draws gas and rotates, the back pressure small turbine that draws gas draws gas and enters backheat equipment 5(by extraction steam pipeline 3 and comprise heater or oxygen-eliminating device 5a, 5b, 5c, the backheat equipment such as 5d) or heat supply give hot user, the small turbine quantity of drawing gas can be 1, 2, 3 and more than, the back pressure small turbine steam discharge that draws gas enters backheat equipment 6(by exhaust steam pipeline 4 and comprises the backheat equipment such as heater, oxygen-eliminating device) or heat supply to hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
The back pressure small turbine that draws gas can divide cylinder to arrange or use gearbox to be connected with main steam turbine with main steam turbine, as shown in Fig. 7～9.Perhaps, draw gas small turbine and main steam turbine intermediate pressure cylinder of back pressure closes cylinder and arranges, as shown in Figure 10～11.Small turbine vapour source can be that high-pressure cylinder steam discharge, high-pressure cylinder draw gas, boiler secondary is hankered a heating steam again.In Fig. 7～11, the back pressure small turbine that draws gas is provided with 2 grades of extraction openings, supporting 2 road extraction steam pipelines, corresponding 2 grades of backheat equipment, small turbine draw gas quantity can be also 1,3 or more than.In each embodiment shown in the drawings, backheat equipment is single-row 1 100% capacity heater, and still, heater also can adopt 2 50% capacity patterns of biserial.
Equally, in the embodiment shown in Fig. 7～11, for feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, consider to retain conventional condensed steam type small turbine and drive the feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat again is provided not to backheat equipment (or hot user), than the back pressure small turbine that drives other power equipments, do not establish small turbine exhaust steam flow balance piping and small turbine and start exhaust steam pipeline, system is comparatively simple.
Below explanation is for twin shaft pattern double reheat unit, in conjunction with Figure 12～26, the coaxially arranged back pressure of of the present invention and the double reheat main steam turbine small turbine thermodynamic system of drawing gas is described.For twin shaft pattern double reheat unit, one or two back pressure small turbine that draws gas can be set, and the back pressure small turbine that draws gas can be used before single reheat steam as the back pressure small turbine vapour source of drawing gas, or use before double reheat steam as the back pressure small turbine vapour source of drawing gas.Below various concrete layouts are elaborated.
Figure 12～16 illustrate according to twin shaft pattern double reheat unit of the present invention with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of double reheat main steam turbine.In Figure 12～16 illustrated embodiments, this system only arranges the back pressure small turbine 1 that draws gas, and uses steam before single reheat as the draw gas thermodynamic system in small turbine vapour source of back pressure.System flow is as follows: steam (comprises low-temperature primary reheated steam (as shown in Figure 12 and 15), steam turbine ultra-high pressure cylinder level is drawn gas (as shown in figure 13), the vapour source such as heating steam (as shown in Figure 14 and 16) in the middle of boiler single reheat) enter the back pressure small turbine 1 that draws gas by the back pressure small turbine admission piping 2 that draws gas, steam drives the back pressure small turbine 1 that draws gas and rotates, the back pressure small turbine that draws gas draws gas and enters backheat equipment 5(by extraction steam pipeline 3 and comprise heater, the backheat equipment such as oxygen-eliminating device) or heat supply give hot user, the small turbine quantity of drawing gas can be 1, 2, 3 and more than, the back pressure small turbine steam discharge that draws gas enters backheat equipment 6(by exhaust steam pipeline 4 and comprises the backheat equipment such as heater, oxygen-eliminating device) or heat supply to hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
The back pressure small turbine that draws gas can divide cylinder to arrange or use gearbox to be connected with main steam turbine with main steam turbine, as shown in Figure 12～14.Perhaps, draw gas small turbine and main steam turbine high-pressure cylinder of back pressure closes cylinder and arranges, as shown in Figure 15～16.Small turbine vapour source can be that ultra-high pressure cylinder steam discharge, ultra-high pressure cylinder draw gas, the middle heating steam of boiler single reheat.In Figure 12～16 illustrated embodiments, the back pressure small turbine that draws gas is provided with 3 grades of extraction openings, supporting 3 road extraction steam pipelines, corresponding 3 grades of backheat equipment, small turbine draw gas quantity can be also 1,2 or more than.In each embodiment shown in the drawings, backheat equipment is single-row 1 100% capacity heater, and this heater also can adopt 2 50% capacity patterns of biserial.
Equally, in the embodiment shown in Figure 12～16, for feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, consider to retain conventional condensed steam type small turbine and drive the feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat again is provided not to backheat equipment (or hot user), than the back pressure small turbine that drives other power equipments, do not establish small turbine exhaust steam flow balance piping and small turbine and start exhaust steam pipeline, system is comparatively simple.
Figure 17～21 illustrate in twin shaft pattern double reheat unit, and the back pressure small turbine 1 that draws gas only is set, and use steam before double reheat as the back pressure back pressure in the small turbine vapour source small turbine thermodynamic system of drawing gas of drawing gas.As shown in Figure 17～21, system flow is as follows: steam (comprises low temperature double reheat steam (as shown in Figure 17 and 20), the steam turbine high-pressure cylinder level is drawn gas (as shown in figure 18), boiler secondary is hankered the vapour sources such as a heating steam (as shown in Figure 19 and 21) again) enter the back pressure small turbine 1 that draws gas by the back pressure small turbine admission piping 2 that draws gas, steam drives the back pressure small turbine 1 that draws gas and rotates, the back pressure small turbine that draws gas draws gas and enters backheat equipment 5(by extraction steam pipeline 3 and comprise heater, the backheat equipment such as oxygen-eliminating device) or heat supply give hot user, the small turbine quantity of drawing gas can be 1, 2, 3 and more than, the back pressure small turbine steam discharge that draws gas enters backheat equipment 6(by exhaust steam pipeline 4 and comprises the backheat equipment such as heater, oxygen-eliminating device) or heat supply to hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
The back pressure small turbine that draws gas can divide cylinder to arrange or use gearbox to be connected with main steam turbine with main steam turbine, as shown in Figure 17～19.Perhaps, draw gas small turbine and main steam turbine intermediate pressure cylinder of back pressure closes cylinder and arranges, as shown in Figure 20～21.Small turbine vapour source can be that high-pressure cylinder steam discharge, high-pressure cylinder draw gas, boiler secondary is hankered a heating steam again.In Figure 17～21 illustrated embodiments, the back pressure small turbine that draws gas is provided with 2 grades of extraction openings, supporting 2 road extraction steam pipelines, corresponding 2 grades of backheat equipment, small turbine draw gas quantity can be also 1,3 or more than.In each embodiment shown in the drawings, backheat equipment is single-row 1 100% capacity heater, and this heater also can adopt 2 50% capacity patterns of biserial.
In embodiment shown in Figure 17～21, for feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, consider to retain conventional condensed steam type small turbine and drive the feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat again is provided not to backheat equipment (or hot user), than the back pressure small turbine that drives other power equipments, do not establish small turbine exhaust steam flow balance piping and small turbine and start exhaust steam pipeline, system is comparatively simple.
Figure 22～26 illustrate two back pressures draw gas small turbine 1 and 14 are set, and use respectively before single reheat steam before steam and double reheat as the draw gas system flow chart of thermodynamic system in small turbine vapour source of back pressure.As Figure 22～26, system flow is as follows: steam (comprises low-temperature primary or double reheat steam (as shown in Figure 22 and 25), steam turbine ultra-high pressure cylinder or high-pressure cylinder level are drawn gas (as shown in figure 23), the vapour source such as heating steam (as shown in Figure 24 and 26) in the middle of boiler single reheat or double reheat) enter the back pressure small turbine that draws gas by the back pressure small turbine admission piping 3 and 15 that draws gas, steam drives the back pressure small turbine 1 and 14 that draws gas and rotates, the back pressure small turbine that draws gas draws gas and enters backheat equipment 5 by extraction steam pipeline 3 and 16 respectively and 18(comprises heater, the backheat equipment such as oxygen-eliminating device) or heat supply give hot user, the small turbine quantity of drawing gas can be 1, 2, 3 and more than, back pressure is drawn gas, and the small turbine steam discharge enters backheat equipment 6 by exhaust steam pipeline 4 and 17 respectively and 19(comprises the backheat equipment such as heater, oxygen-eliminating device) or heat supply give hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
Draw gas small turbine and main steam turbine of back pressure divides cylinder to arrange or uses gearbox to be connected with main steam turbine, as shown in Figure 22～24.Perhaps, the draw gas main steam turbine high-pressure cylinder of small turbine and parameter matching or intermediate pressure cylinder of back pressure closes cylinder and arranges, as shown in Figure 25～26.Two small turbine vapour sources are respectively ultra-high pressure cylinder or high-pressure cylinder steam discharge, ultra-high pressure cylinder or high-pressure cylinder draw gas, heating steam in the middle of boiler single reheat or double reheat.In Figure 22～26 illustrated embodiments, two back pressures small turbine that draws gas is respectively equipped with 3 grades and 1 grade of extraction opening, supporting 3 roads and 1 road extraction steam pipeline, corresponding 3 grades or 1 grade of backheat equipment, two small turbines draw gas quantity can be also 1,2 or more than.In each embodiment shown in the drawings, backheat equipment is single-row 1 100% capacity heater, and this heater also can adopt 2 50% capacity patterns of biserial.
In embodiment shown in Figure 22～26, for feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, consider to retain conventional condensed steam type small turbine and drive the feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat again is provided not to backheat equipment (or hot user), than the back pressure small turbine that drives other power equipments, do not establish small turbine exhaust steam flow balance piping and small turbine and start exhaust steam pipeline, system is comparatively simple.
The present invention is directed to the foregoing problems of existing thermodynamic system, utilize the front steam of heat again, drive the back pressure small turbine that draws gas, from small turbine, draw gas, utilize the small turbine that the degree of superheat is lower to draw gas and steam discharge, come heat-setting water and feedwater by heater, compare with existing thermodynamic system, can improve efficiency of thermal cycle.
On this basis, back pressure is drawn gas small turbine and main steam turbine is coaxially arranged.For feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of small turbine of drawing gas will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, separately establish condensed steam type small turbine and drive feed water pump, can effectively solve back pressure vapour amount, the electric quantity balancing problem that small turbine directly drives feed water pump (or other driven devices) to bring of drawing gas.
Simultaneously, the present invention has significantly reduced the steam flow that enters reheater, can reduce the heat exchange area of reheater, reduces the flow area in reheating pipe road, thereby significantly reduces the cost of re-heating subsystem.
For example, to 1 1000MW, 600 ℃ of double reheat ultra supercritical power generation units, adopt the back pressure of the present invention small turbine thermodynamic system of drawing gas, with the conventional main steam turbine thermodynamic system of drawing gas, compare, re-heating subsystem investment reduces approximately 1.5 hundred million, simultaneously efficiency of thermal cycle can improve approximately 0.4%, be equivalent to can economize on coal every year approximately 4000 tons, there are good returns of investment.
Simultaneously, the present invention has significantly reduced the steam flow that enters steam turbine high-pressure cylinder or intermediate pressure cylinder, can reduce the manufacture cost of high-pressure cylinder or intermediate pressure cylinder;
Simultaneously, the present invention, for the height steam turbine of thermal parameter (as reheat steam temperature more than 620 ℃) again, can avoid high temperature to draw gas, and reduces the material rate of extraction line, valve, heater, the manufacture cost of the above-mentioned pipeline of decrease and equipment.
Below described preferred embodiment of the present invention in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present invention, those skilled in the art can make various changes or modifications the present invention.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
- One kind with the coaxially arranged back pressure of the double reheat main steam turbine small turbine thermodynamic system of drawing gas, double reheat main steam turbine group is provided with ultra-high pressure cylinder, high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and single reheat device and secondary reheater, the described back pressure small turbine thermodynamic system of drawing gas comprises back pressure small turbine, back pressure small turbine admission piping, back pressure small turbine extraction steam pipeline, back pressure small turbine exhaust steam pipeline and back pressure small turbine backheat equipment and the back pressure small turbine steam discharge backheat equipment that draws gas that draws gas that draws gas that draws gas that draws gas that draws gas that draws gas, and it is characterized in that:Described back pressure small turbine admission piping and the described double reheat main steam turbine group vapor communication before heat again of drawing gas, utilize described double reheat main steam turbine group again the steam before heat as the vapour source, drive the described back pressure small turbine that draws gas; AndDescribed back pressure draw gas small turbine and described double reheat main steam turbine coaxially arranged.
- 2. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, the described back pressure small turbine vapour source of drawing gas is ultra-high pressure cylinder steam discharge and/or high-pressure cylinder steam discharge.
- 3. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, the described back pressure small turbine vapour source of drawing gas is that ultra-high pressure cylinder draws gas and/or high-pressure cylinder draws gas.
- 4. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, the middle heating steam that small turbine vapour source is single reheat device and/or secondary reheater of drawing gas of described back pressure.
- 5. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, the described back pressure small turbine that draws gas divides cylinder with described double reheat main steam turbine or is connected with described double reheat main steam turbine by gearbox.
- 6. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, draw gas small turbine and described high-pressure cylinder and/or described intermediate pressure cylinder of described back pressure closes cylinder.
- 7. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, described back pressure the drawing gas of small turbine of drawing gas is 1 grade or 2 grades, or more than 2 grades.
- 8. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, two back pressures small turbine that draws gas is set, and uses respectively before single reheat before steam and double reheat steam as the vapour source.
- 9. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, is characterized in that, described back pressure draw gas the drawing gas of small turbine, steam discharge is guided to heater, oxygen-eliminating device, or guides to other regenerator, Auxiliary Steam or heat supply network.
- 10. the back pressure as claimed in claim 1 small turbine thermodynamic system of drawing gas, it is characterized in that, described back pressure small turbine backheat equipment and the described back pressure small turbine steam discharge backheat equipment that draws gas that draws gas that draws gas is single-row 100% capacity heater, or biserial 50% capacity heater.
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Cited By (2)
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| CN104763485A (en) * | 2014-04-30 | 2015-07-08 | 南京博沃科技发展有限公司 | Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit |
| CN113638776A (en) * | 2021-08-09 | 2021-11-12 | 华能国际电力股份有限公司上海石洞口第一电厂 | Steam extraction back pressure type steam turbine thermodynamic system and control method thereof |
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Address after: 200063 Wuning Road, Shanghai, No. 409, No. Applicant after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group Applicant after: Shanghai Turbine Company, Ltd. Address before: 200063 Wuning Road, Shanghai, No. 409, No. Applicant before: East China Electric Power Design Institute, China Power Engineering Consulting Group Corporation Applicant before: Shanghai Turbine Company, Ltd. |
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Application publication date: 20140101 |
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