CN203499741U - Backpressure steam extraction small steam turbine thermal system coaxially arranged with primary reheating main steam turbine set - Google Patents
Backpressure steam extraction small steam turbine thermal system coaxially arranged with primary reheating main steam turbine set Download PDFInfo
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- CN203499741U CN203499741U CN201320615112.9U CN201320615112U CN203499741U CN 203499741 U CN203499741 U CN 203499741U CN 201320615112 U CN201320615112 U CN 201320615112U CN 203499741 U CN203499741 U CN 203499741U
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Abstract
The utility model provides a backpressure steam extraction small steam turbine thermal system coaxially arranged with a primary reheating main steam turbine set. The primary reheating main steam turbine set is provided with a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a reheater. The backpressure steam extraction small steam turbine thermal system comprises a backpressure steam extraction small steam turbine, a steam inlet pipe system, a steam extraction pipe system, a steam exhaust pipe system and back-heating equipment. Steam before reheating of the primary reheating main steam turbine set serves as the steam source of the thermal system to drive the backpressure steam extraction small steam turbine. Steam extraction and steam exhaustion of the backpressure steam extraction small steam turbine are used for heating supplied water and condensed water. The backpressure steam extraction small steam turbine and the primary reheating main steam turbine set are coaxially arranged. The backpressure steam extraction small steam turbine thermal system can reduce system manufacturing cost and improve thermodynamic cycle efficiency.
Description
Technical field
The utility model relates to and is applicable to single reheat steam turbine power generation unit, is specifically related to back pressure type in the steam power plant single reheat steam turbine set small turbine thermodynamic system of drawing gas.
Background technique
Adopt the thermal power plant of single reheat technology, its re-heating subsystem is, the steam of having done part merit in main steam turbine is drawn again and heated, and then draws back-steam turbine and continues acting, to improve thermodynamic system efficiency.
Adopt the firepower electrical plant of single reheat technology, conventionally also configure heat regenerative system, the heat drawing gas with main steam turbine comes heat-setting water and feedwater by heater, and the heat drawing gas is all 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 there being the thermal power plant of re-heating subsystem, then drawing gas after heat be subject to reheating effect, temperature improves, and the degree of superheat increases thereupon, and the energy that makes to can be used to acting is used for heat-setting water and feedwater, has affected the efficiency of thermodynamic cycle.Meanwhile, for the unit (if reheat steam temperature is more than 620 ℃) that thermal parameter is higher again, then the extraction temperature after heat is high, need 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 single reheat main frame thermodynamic system of drawing gas, wherein steam turbine high-pressure cylinder steam discharge causes reheater, carry out heat temperature raising, then enter Steam Turbine Through IP Admission, in the middle of Steam Turbine Through IP Admission, be provided with 1,2 or above extraction opening, from this extraction opening, draw steam, heat-setting water and feedwater, reclaim the latent heat of vaporization, improve efficiency of thermal cycle.But the temperature of drawing gas after heat is again higher, and the degree of superheat is large, the energy of superheat section is also used to heating water with the latent heat of vaporization, affects efficiency of thermal cycle.
Model utility content
The utility model is for the above-mentioned situation of existing thermodynamic system, utilize again the steam before heat, 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, by heater, come heat-setting water and feedwater, compare with existing thermodynamic system, can improve efficiency of thermal cycle.And significantly reduced the steam flow that enters 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 little machine 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 establishes condensed steam type small turbine and drives 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 one side of the present utility model, the coaxially arranged back pressure of a kind of and the single reheat main steam turbine small turbine thermodynamic system of drawing gas is provided, single reheat main steam turbine group is provided with high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and 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, wherein:
The described back pressure vapor communication before the heat again of small turbine admission piping and described single reheat main steam turbine group of drawing gas, utilizes steam before the heat again of described single reheat main steam turbine group as vapour source, drives the described back pressure small turbine that draws gas; And
Described back pressure draw gas small turbine and described single reheat main steam turbine coaxially arranged.
In one preferred embodiment, the back pressure small turbine admission piping that draws gas is connected with the blow-off line of high-pressure cylinder.
In another preferred embodiment, the back pressure small turbine admission piping that draws gas is connected with the extraction opening of high-pressure cylinder.
In another preferred embodiment, this back pressure small turbine admission piping that draws gas can be connected with the outlet conduit of the low-temperature reheater of reheater.
In another preferred embodiment, this back pressure small turbine that draws gas can divide cylinder with single reheat main steam turbine.
In another preferred embodiment, this back pressure small turbine that draws gas can close cylinder with intermediate pressure cylinder.
In another preferred embodiment, the back pressure small turbine that draws gas can be connected with single reheat main steam turbine by gearbox.
Back pressure the drawing gas of small turbine of drawing gas can be 1 grade or 2 grades, or more than 2 grades.
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.
The back pressure of the present utility model small turbine thermodynamic system of drawing gas can reduce system cost, improves efficiency of thermal cycle simultaneously.
Accompanying drawing explanation
Fig. 1 is the system flow chart of the existing single reheat main frame thermodynamic system of drawing gas.
Fig. 2-4 illustrate according to the first embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.
Fig. 5-6 illustrate according to the second embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.
Fig. 7-9 illustrate according to the 3rd embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present utility model is elaborated, so that clearer, understands the purpose of this utility model, feature and advantage.It should be understood that embodiment shown in the drawings is not the restriction to the utility model scope, and just for the connotation of technical solutions of the utility model is described.
Terminological interpretation
Hot again: the steam of having done part merit in steam turbine is drawn again and heated, then draw 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 called back pressure turbine to the steam turbine higher than atmospheric piping or heat exchanger.
Condensing steam turbine: steam discharge is called condensing steam turbine 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 and intermediate pressure cylinder to close cylinder, small turbine is used gearbox to be connected with main steam turbine.
The coaxially arranged back pressure of of the present utility model and the single reheat main steam turbine small turbine thermodynamic system of drawing gas is a part for steamer generating circulation system.Particularly, steamer generating circulation system comprises coaxially arranged single reheat back pressure draw gas small turbine thermodynamic system, high-pressure cylinder 7, intermediate pressure cylinder 8, low pressure (LP) cylinder 9, vapour condenser 10 and reheater 11.The coaxially arranged single reheat back pressure small turbine thermodynamic system of drawing gas is comprised of back pressure small turbine 1, back pressure small turbine admission piping 2, back pressure small turbine extraction steam pipeline 3, back pressure small turbine exhaust steam pipeline 4 and back pressure draw gas backheat equipment 5 and the steam discharge backheat equipment 6 of small turbine that draws gas that draws gas that draws gas that draws gas that draws gas, wherein, coaxially arranged pattern has: 1 minute cylinder of small turbine, small turbine 1 close cylinder with intermediate pressure cylinder 8, small turbine 1 is used gearbox 12 to be connected with the high-pressure cylinder 7 of main steam turbine.
During operation, steam (comprise that cold reheat steam, steam turbine high-pressure cylinder level is drawn gas, the vapour source such as heating steam in the middle of boiler) enters 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 to rotate, for generating.Back pressure the drawing gas of small turbine 1 of drawing gas enters backheat equipment 5(by extraction steam pipeline 3 and comprises the backheat equipment such as heater or oxygen-eliminating device 5a, 5b, 5c) with heated feed water and/or water of condensation, or the heat supply quantity of drawing gas of drawing gas small turbine 1 to hot user, back pressure can be 1 grade, 2 grades, 3 grades and more than.The draw gas steam discharge of small turbine 1 of back pressure enters backheat equipment 6(by exhaust steam pipeline 4 and comprises the backheat equipment such as heater or oxygen-eliminating device 6a) with heated feed water and/or water of condensation, or heat supply gives hot user, draw gas, heat and the working medium of steam discharge is recovered in circulation system by backheat equipment.
Above-mentioned back pressure is drawn gas in small turbine thermodynamic system, for feed water pump, is electronic unit, and back pressure is drawn gas little machine when coaxially arranged, and main building integral arrangement will be more compact, can effectively save main building area, cost saving.The unit that is steam-operating for feed water pump, separately establishes condensed steam type small turbine (not shown) and drives 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.
Fig. 2-4 illustrate according to the first embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.As in Figure 2-4, in the present embodiment, the back pressure 1 minute cylinder of small turbine that draws gas is arranged, does not use gearbox.In Fig. 2-4, back pressure draw gas that the vapour source of small turbine 1 is respectively high-pressure cylinder steam discharge, high-pressure cylinder draws gas and boiler in the middle of heating steam, that is, back pressure draw gas small turbine steam inlet respectively with the blow-off line of high-pressure cylinder, the outlet conduit of the low-temperature reheater of the extraction opening of high-pressure cylinder and reheater be connected.The back pressure small turbine 1 that draws gas is provided with 3 grades of extraction openings, supporting 3 road extraction steam pipelines 4, corresponding 3 grades of backheat equipment 5 and 1 grade of backheat equipment 6.In the present embodiment, backheat equipment 5 comprises heater 5a, 5b, 5c.Backheat equipment 6 is oxygen-eliminating device 6a.Certainly, small turbine extraction opening can be also 1 grade, 2 grades or other quantity.In the present embodiment, each heater 5a, 5b, 5c are single-row 1 100% capacity heater, and still, each heater also can adopt 2 50% capacity patterns of biserial.
Fig. 5-6 illustrate according to the second embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.As shown in Fig. 5-6, in the present embodiment, draw gas small turbine 1 of back pressure closes cylinder with intermediate pressure cylinder 8 and arranges, does not use gearbox.In Fig. 5-6, small turbine vapour source is respectively high-pressure cylinder steam discharge and the middle heating steam of boiler.The back pressure small turbine 1 that draws gas is provided with 3 grades of extraction openings, supporting 3 road extraction steam pipelines 4, corresponding 3 grades of backheat equipment 5 and 1 grade of backheat equipment 6.Equally, small turbine extraction opening can be also 1 grade, 2 grades or other quantity.In the present embodiment, each heater is single-row 1 100% capacity heater, and still, each heater also can adopt 2 50% capacity patterns of biserial.
Fig. 7-9 illustrate according to the 3rd embodiment of the present utility model with the draw gas system flow chart of small turbine thermodynamic system of the coaxially arranged back pressure of single reheat main steam turbine.As Figure 7-9, the back pressure 1 minute cylinder of small turbine that draws gas is arranged, and is connected with the high-pressure cylinder 7 of main steam turbine by gearbox 12.In Fig. 7-9, back pressure draw gas that the vapour source of small turbine 1 is respectively high-pressure cylinder steam discharge, high-pressure cylinder draws gas and boiler in the middle of heating steam.The back pressure small turbine 1 that draws gas is provided with 3 grades of extraction openings, supporting 3 road extraction steam pipelines 4, corresponding 3 grades of backheat equipment 5 and 1 grade of backheat equipment 6.Similarly, small turbine extraction opening can be also 1 grade, 2 grades or other quantity.In the present embodiment, each heater is single-row 1 100% capacity heater, and still, each heater also can adopt 2 50% capacity patterns of biserial.
In the various embodiments described above, the draw gas exhaust of small turbine 1 of back pressure enters exhaust backheat equipment 6(oxygen-eliminating device or heater).
In the various embodiments described above, back pressure is drawn gas, and small turbine draws gas, steam discharge can be guided to heater, oxygen-eliminating device, also can guide to other regenerator, Auxiliary Steam or heat supply network.
Back pressure of the present utility model is drawn gas in small turbine thermodynamic system, utilize again the steam before heat, 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, by heater, come heat-setting water and feedwater, compare with existing thermodynamic system, can improve efficiency of thermal cycle.In addition, for feed water pump, be electronic unit, the back pressure coaxially arranged main building integral arrangement of little machine 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 feed water pump group, back pressure is drawn gas small turbine only for the low overheat steam of heat is again 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.
Meanwhile, the utility model 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.
To 1 1000MW, 600 ℃ of single reheat ultra supercritical power generation units, adopt the utility model back pressure small turbine thermodynamic system of drawing gas, compare with the conventional main steam turbine thermodynamic system of drawing gas, re-heating subsystem investment reduces approximately 5,000 ten thousand, efficiency of thermal cycle can improve approximately 0.2% simultaneously, be equivalent to can economize on coal every year approximately 2000 tons, there are good returns of investment.
In addition, the utility model has significantly reduced the steam flow that enters Steam Turbine Through IP Admission, can reduce the manufacture cost of intermediate pressure cylinder.
In addition, the utility model, for the height steam turbine of thermal parameter (if reheat steam temperature is more than 620 ℃) again, can avoid high temperature to draw gas, and reduces the material rate of extraction line, valve, heater, significantly reduces the manufacture cost of above-mentioned pipeline and equipment.
Below described preferred embodiment of the present utility model in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present utility model, those skilled in the art can make various changes or modifications the utility model.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 single reheat main steam turbine small turbine thermodynamic system of drawing gas, single reheat main steam turbine group is provided with high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and 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 single reheat main steam turbine group vapor communication before heat again of drawing gas, utilizes steam before the heat again of described single reheat main steam turbine group as vapour source, drives the described back pressure small turbine that draws gas; AndDescribed back pressure draw gas small turbine and described single 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 admission piping that draws gas is connected with the blow-off line of described high-pressure cylinder.
- 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 admission piping that draws gas is connected with the extraction opening of described high-pressure cylinder.
- 4. 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 admission piping that draws gas is connected with the outlet conduit of the low-temperature reheater of described reheater.
- 5. 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 single reheat main steam turbine of described back pressure divides cylinder.
- 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 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, the described back pressure small turbine that draws gas is connected with described single reheat main steam turbine by gearbox.
- 8. 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.
- 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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| CN201320615112.9U CN203499741U (en) | 2013-09-30 | 2013-09-30 | Backpressure steam extraction small steam turbine thermal system coaxially arranged with primary reheating main steam turbine set |
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| CN201320615112.9U CN203499741U (en) | 2013-09-30 | 2013-09-30 | Backpressure steam extraction small steam turbine thermal system coaxially arranged with primary reheating main steam turbine set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485848A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Backpressure steam extraction small turbine thermal system which is coaxial with single reheating main turbine |
| CN104100313A (en) * | 2014-07-02 | 2014-10-15 | 西安交通大学 | Thermal power plant heat supply extraction steam residual pressure utilization system adopting back pressure extraction turbine |
| CN105019957A (en) * | 2015-07-27 | 2015-11-04 | 中国能源建设集团广东省电力设计研究院有限公司 | Efficient heat regenerative system and method |
| CN105258334A (en) * | 2015-11-11 | 2016-01-20 | 郭红伟 | Heating equipment afterheat recovery device |
-
2013
- 2013-09-30 CN CN201320615112.9U patent/CN203499741U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485848A (en) * | 2013-09-30 | 2014-01-01 | 中国电力工程顾问集团华东电力设计院 | Backpressure steam extraction small turbine thermal system which is coaxial with single reheating main turbine |
| CN104100313A (en) * | 2014-07-02 | 2014-10-15 | 西安交通大学 | Thermal power plant heat supply extraction steam residual pressure utilization system adopting back pressure extraction turbine |
| CN105019957A (en) * | 2015-07-27 | 2015-11-04 | 中国能源建设集团广东省电力设计研究院有限公司 | Efficient heat regenerative system and method |
| CN105258334A (en) * | 2015-11-11 | 2016-01-20 | 郭红伟 | Heating equipment afterheat recovery device |
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Granted publication date: 20140326 |