CN1605716A - Supercritical air cooling steam turbine - Google Patents
Supercritical air cooling steam turbine Download PDFInfo
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- CN1605716A CN1605716A CN 200310107844 CN200310107844A CN1605716A CN 1605716 A CN1605716 A CN 1605716A CN 200310107844 CN200310107844 CN 200310107844 CN 200310107844 A CN200310107844 A CN 200310107844A CN 1605716 A CN1605716 A CN 1605716A
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Abstract
The supercritical air-cooled steam turbine suitable for use in thermal power plant in unwatered area consists of supercritical wet cooled steam turbine high pressure cylinder, supercritical wet cooled steam turbine medium pressure cylinder and two low pressure cylinders. It features the two air cooled low pressure cylinders, the connection with low pressure cylinder bearing seat between the supercritical wet cooled steam turbine medium pressure cylinder and the air cooled low pressure cylinders and between the two air cooled low pressure cylinders, and the same structure of the high pressure cylinder and medium pressure cylinder in the supercritical air-cooled steam turbine and the high pressure cylinder and medium pressure cylinder in the supercritical wet cooled steam turbine. The two low pressure cylinders have improved structure and the present invention has direct air cooled exhaust. The present invention has low heat loss rate, high heat efficiency and low water consumption.
Description
Technical field
The present invention relates to a kind of overcritical air cooling turbine, be applicable to the thermal power plant, water-deficient area, belong to power generating equipment steam turbine technology field.
Background technique
The northwest of the Middle East, the Central Asia and part African country and China, North, Northeast China area all belong to rich coal or rich oil but the problem that the thermal power plant faces lack of water is built in the area of lack of water or arid.The water globe resource reduces day by day, and industry and the life water usage but grow with each passing day.China's water resources safety problem is severe day by day, per capita water resources quantity be equivalent to the world per capita quantity 1/4th, and mix extremely unbalancedly at the region branch, in Shanxi of northern China, rich coal area such as Shaanxi, Inner Mongol, Xinjiang, Gansu, water resources extremely lacks.Build the thermal power plant both at home and abroad in the water-deficient area and adopt subcritical air cooling turbine, be called for short air cooling turbine.The low pressure steam discharge of subcritical air cooling turbine adopts direct air cooling system or indirect air cooling system cooling, and its water usage only is that water-saving result is remarkable with 1/4th of power wet cooling gas turbine water usage.The air cooling turbine that adopts at present is subcritical air cooling turbine both at home and abroad, and the steam turbine steam inlet condition is subcritical parameter, and main steam pressure is 16.67MPa, and the scope of main steam and reheat steam temperature is about 538 ℃ to 540 ℃.The advantage of subcritical air cooling turbine is to be applied to the water-deficient area, and the major defect of subcritical air cooling turbine is that system's heat consumption rate height, generatine set heat efficiency are low.
The steam inlet condition of overcritical wet cooling gas turbine is a supercritical parameter, and the scope of main steam pressure is 22.2MPa to 24.99MPa, and the scope of main steam and reheat steam temperature is 538 ℃ to 579 ℃.The characteristics of overcritical wet cooling gas turbine are good economy performance, compare with the subcritical wet cooling gas turbine with power, and the major advantage of overcritical wet cooling gas turbine is that heat consumption rate is low, the generatine set heat efficiency height.The heat consumption rate of overcritical wet cooling gas turbine is than low 2 percentage points approximately of subcritical air cooling turbines, and the subcritical Air-cooled Unit of the thermal efficiency ratio of overcritical clammy unit is high approximately 2 percentage points.As shown in Figure 1, for overcritical wet cooling gas turbine low pressure (LP) cylinder structural representation, mainly be made up of low pressure cylinder, low-pressure shaft, bearing support, stator blade, moving vane, steam discharge diffuser pipe, its structural feature is:
1. the altitude range of the final stage moving blade 10 of overcritical wet cooling gas turbine low pressure cylinder is between 800mm to 1200mm;
2. the height of two low pressure cylinders of overcritical wet cooling gas turbine 8,9 is 6000mm-9000mm, and length is 6000mm-8000mmm;
3. the bearing support 11 of low pressure (LP) cylinder adopts seat cylinder formula bearing support in the low pressure (LP) cylinder the inside usually, and center line of shafting will oscilaltion causes bearing load to be redistributed with the variation of low pressure (LP) cylinder exhaust temperature, influence axle system stability;
4. the length overall of the steam discharge diffuser pipe 12 of overcritical wet cooling gas turbine low pressure (LP) cylinder is 1900mm-2500mm, and the guide ring outlet diameter Φ of steam discharge diffuser pipe is 4500mm-5000mm, the initial angle of flare α of the outer wall of exhaust diffuser pipe
2It is 15 °-25 °.
The low pressure steam discharge of overcritical wet cooling gas turbine adopts the circulating water wet condenser cooling of unifying, and its major defect is that water usage is big, can't use in the water-deficient area.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can be applied to the water-deficient area, water usage is little, and heat consumption rate is low, the overcritical air cooling turbine that generatine set heat efficiency is high.
In order to achieve the above object, solution of the present invention provides a kind of overcritical air cooling turbine, form by overcritical wet cooling gas turbine high-pressure cylinder, overcritical wet cooling gas turbine intermediate pressure cylinder and two low pressure (LP) cylinders, its characteristics are, described two low pressure (LP) cylinders are the air cooling turbine low pressure (LP) cylinder, between overcritical wet cooling gas turbine intermediate pressure cylinder and the air cooling turbine low pressure (LP) cylinder, connected by the floor model bearing support between two air cooling turbine low pressure (LP) cylinders.
The final stage moving blade height of described two air cooling turbine low pressure (LP) cylinders foreshortens to 500mm-700mm;
The cylinder height H of described two air cooling turbine low pressure (LP) cylinders is reduced to 5000mm-7000mm, and axial length L is reduced to 5500mm-6500mm;
Described low pressure (LP) cylinder bearing support is the floor model bearing block structure in the outside of two air cooling turbine low pressure (LP) cylinders;
The length overall L of the steam discharge diffuser pipe of described two air cooling turbine low pressure (LP) cylinders
1Shorten to 1000mm-1800mm, the guide ring outlet diameter Φ of steam discharge diffuser pipe is reduced to 4000mm-4600mm, the initial angle of flare α of the outer wall of exhaust diffuser pipe
2Expand as 25-35 °.
The invention provides a kind of overcritical air cooling turbine, this steam turbine adopts overcritical steam inlet condition, the scope of main steam pressure is 22.21MPa to 24.99MPa, the scope of the temperature of main steam and reheated steam is 538 ℃ to 579 ℃, and promptly the high-pressure cylinder of overcritical air cooling turbine is identical with the high-pressure cylinder and the intermediate pressure cylinder structure of overcritical wet cooling gas turbine with intermediate pressure cylinder.Two low pressure (LP) cylinders of overcritical air cooling turbine improve the low pressure steam discharge cooling that makes this steam turbine from structure and adopt direct air cooling, it is low to make overcritical air cooling turbine both have a heat consumption rate of overcritical wet cooling gas turbine, the advantage that generatine set heat efficiency is high, it is few to have subcritical air cooling turbine water consumption again, can be applied to the advantage of water-deficient area.
With compare with the overcritical wet cooling gas turbine of power, the final stage moving blade height of two air cooling turbine low pressure (LP) cylinders shortens, the low pressure leaving area of overcritical air cooling turbine is about 58% to 68% of overcritical wet cooling gas turbine leaving area, to be suitable for the back pressure height of overcritical air cooling turbine, because overcritical air cooling turbine low pressure leaving area is little, overcritical air cooling turbine low pressure exhaust casing should adopt the good structure of aeroperformance, the loss coefficient ξ of low pressure exhaust casing
n＜1.
Overcritical air cooling turbine final stage adopts relatively shorter moving vane, is in order to adapt to Air-cooled Unit back pressure height, characteristics that volume flow is little.The design back pressure of overcritical air cooling turbine is higher approximately 1 times to 2 times than overcritical wet cooling gas turbine; The high back pressure of overcritical wet cooling gas turbine is generally high approximately 1 times than the design back pressure, and the high back pressure of overcritical air cooling turbine is generally high approximately 3 times than designing back pressure.Warm bulb temperature is depended in the back pressure variation of overcritical wet cooling gas turbine, and the back pressure of overcritical air cooling turbine depends on dry-bulb temperature.The atmospheric temperature day and night temperature is big, and atmospheric temperature changes more frequent than coolant water temperature, so overcritical air cooling turbine back pressure changes frequently.Overcritical air cooling turbine adopts relatively shorter exhaust stage blade, under the big condition of back pressure height, back pressure excursion, has higher stage load, flow do not block, separation of flow zone is little, and require to flow and do not block.Overcritical air cooling turbine adopts relatively shorter final stage moving blade, can improve the rigidity of moving vane, helps reducing the dynamic stress peak value of blade.
The load carrying exhaust temperature of overcritical air cooling turbine equals the saturation temperature of turbine back pressure correspondence.Since overcritical air cooling turbine back pressure height and back pressure vary within wide limits, then overcritical air cooling turbine low pressure exhaust temperature height and vary within wide limits.The center line of overcritical air cooling turbine low pressure (LP) cylinder will change with low pressure (LP) cylinder steam discharge temperature to be raised or reduces.So overcritical air cooling turbine should adopt the floor model bearing block structure, the low pressure (LP) cylinder bearing support directly is supported on the basis that reinforced concrete casts, center line of shafting does not change with the low pressure exhaust temperature, the bearing load distribution does not also change with the low pressure exhaust temperature, guarantees that overcritical air-cooled steam turbine arbor is a stability.
Because overcritical air cooling turbine low pressure (LP) cylinder adopts the floor model bearing support, moved on to the outside of turbine low pressure cylinder by original bearing support in turbine low pressure cylinder, cause the length overall of the steam discharge diffuser pipe of turbine low pressure cylinder to shorten, but the length overall of the steam discharge diffuser pipe of turbine low pressure cylinder shortens, and can make low pressure (LP) cylinder steam discharge aeroperformance variation.By the guide ring outlet diameter of change steam discharge diffuser pipe and the initial angle of flare α of outer wall of steam discharge diffuser pipe
2The steam discharge loss of turbine low pressure cylinder is reduced, remedy the shortcoming of the relative distance shortening of low pressure exhaust casing, reach low pressure exhaust casing aeroperformance purpose preferably.
Advantage of the present invention is that heat consumption rate is low, the generatine set heat efficiency height, and water consumption is few, and its water usage only is with 1/4th of the overcritical wet cooling gas turbine of power, can use in the water-deficient area.
Description of drawings
Fig. 1 is overcritical wet cooling gas turbine low pressure (LP) cylinder structural representation;
Fig. 2 is overcritical air cooling turbine structural representation;
Fig. 3 is overcritical air cooling turbine low pressure (LP) cylinder structural representation;
Fig. 4 is overcritical air cooling turbine low pressure (LP) cylinder final stage diffuser pipe structural representation;
Embodiment
Embodiment:
With the overcritical air cooling turbine of 600MW is example, main steam pressure 24.1MPa, 538 ℃ of main steam temperatures, 538 ℃ of reheat steam temperatures, design back pressure 12.7KPa.
As shown in Figure 2, be overcritical air cooling turbine structural representation, form by overcritical wet cooling gas turbine high-pressure cylinder 1, overcritical wet cooling gas turbine intermediate pressure cylinder 2, air cooling turbine low pressure (LP) cylinder 3 and air cooling turbine low pressure (LP) cylinder 4, connect by floor model bearing support 6 between overcritical wet cooling gas turbine intermediate pressure cylinder 2 and the air cooling turbine low pressure (LP) cylinder 3, between air cooling turbine low pressure (LP) cylinder 3 and the air cooling turbine low pressure (LP) cylinder 4.
As shown in Figure 3, be overcritical air cooling turbine low pressure (LP) cylinder structural representation, the height of exhaust stage blade 5 is 539.99mm; The cylinder height H of air cooling turbine low pressure (LP) cylinder 3 and air cooling turbine low pressure (LP) cylinder 4 is 6670mm, and axial length L is 5380mm; Low pressure (LP) cylinder adopts the floor model bearing support.
As shown in Figure 4, be overcritical air cooling turbine low pressure (LP) cylinder final stage diffuser pipe structural representation, the length overall L of the steam discharge diffuser pipe 7 of air cooling turbine low pressure (LP) cylinder 3 and air cooling turbine low pressure (LP) cylinder 4
1Be 1130.37mm, the guide ring outlet diameter Φ of steam discharge diffuser pipe 7 is 4600mm, final stage exhaust annulus area 3.86 * 4m
2The initial angle of flare α of the outer wall of steam discharge diffuser pipe 7
2It is 31 °; The length overall L of steam discharge diffuser pipe 7
1With the ratio of exhaust stage blade 5 be 2.093, diffuser pipe loss coefficient ξ
n=0.953, ξ
n＜1 has reached optimal design.
Claims (5)
1. overcritical air cooling turbine, form by overcritical wet cooling gas turbine high-pressure cylinder (1), overcritical wet cooling gas turbine intermediate pressure cylinder (2) and two low pressure (LP) cylinders, it is characterized in that, described low pressure (LP) cylinder is air cooling turbine low pressure (LP) cylinder (3) and air cooling turbine low pressure (LP) cylinder (4), between overcritical wet cooling gas turbine intermediate pressure cylinder (2) and the air cooling turbine low pressure (LP) cylinder (3), connected by floor model bearing support (6) between air cooling turbine low pressure (LP) cylinder (3) and the air cooling turbine low pressure (LP) cylinder (4).
2. overcritical air cooling turbine according to claim 1 is characterized in that, the final stage moving blade (5) of described air cooling turbine low pressure (LP) cylinder (3) and air cooling turbine low pressure (LP) cylinder (4) highly foreshortens to 500mm-700mm.
3. overcritical air cooling turbine according to claim 1 is characterized in that, the cylinder height H of described air cooling turbine low pressure (LP) cylinder (3) and air cooling turbine low pressure (LP) cylinder (4) is reduced to 5000mm-7000mm, and axial length L is reduced to 5500mm-6500mm.
4. overcritical air cooling turbine according to claim 1 is characterized in that, described low pressure (LP) cylinder bearing support (6) is the floor model bearing block structure in the outside of air cooling turbine low pressure (LP) cylinder (3) and air cooling turbine low pressure (LP) cylinder (4).
5. a kind of overcritical air cooling turbine according to claim 1 is characterized in that, the length overall L of the steam discharge diffuser pipe (7) of described air cooling turbine low pressure (LP) cylinder (3) and air cooling turbine low pressure (LP) cylinder (4)
1Shorten to 1000mm-1800mm, the guide ring outlet diameter Φ of steam discharge diffuser pipe (7) is reduced to 4000mm-4600mm, the initial angle of flare α of the outer wall of steam discharge diffuser pipe (7)
2Expand as 25-35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101078448A CN1328484C (en) | 2003-10-10 | 2003-10-10 | Supercritical air cooling steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101078448A CN1328484C (en) | 2003-10-10 | 2003-10-10 | Supercritical air cooling steam turbine |
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| Publication Number | Publication Date |
|---|---|
| CN1605716A true CN1605716A (en) | 2005-04-13 |
| CN1328484C CN1328484C (en) | 2007-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101078448A Expired - Fee Related CN1328484C (en) | 2003-10-10 | 2003-10-10 | Supercritical air cooling steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915217A (en) * | 2019-02-02 | 2019-06-21 | 上海发电设备成套设计研究院有限责任公司 | The overall structure and overall performance of air-cooled type high-parameter steam turbine design monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL79505B3 (en) * | 1972-06-10 | 1975-06-30 | ||
| US4338789A (en) * | 1980-02-01 | 1982-07-13 | Dolan John E | Method of varying turbine output of a supercritical-pressure steam generator-turbine installation |
| CN2530042Y (en) * | 2002-04-05 | 2003-01-08 | 东方汽轮机厂 | Direct air cooling turbine steam exhauster for power station |
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- 2003-10-10 CN CNB2003101078448A patent/CN1328484C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915217A (en) * | 2019-02-02 | 2019-06-21 | 上海发电设备成套设计研究院有限责任公司 | The overall structure and overall performance of air-cooled type high-parameter steam turbine design monitoring method |
| CN109915217B (en) * | 2019-02-02 | 2020-06-16 | 上海发电设备成套设计研究院有限责任公司 | Overall structure and overall performance design monitoring method of air-cooled high-parameter steam turbine |
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| Publication number | Publication date |
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| CN1328484C (en) | 2007-07-25 |
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Owner name: SHANGHAI POWER INSTITUTE COMPLETE POWER EQUIPMENT Free format text: FORMER OWNER: SHANGHAI COMPLETE POWER EQUIPMENT RESEARCH INSTITUTE Effective date: 20090612 |
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Effective date of registration: 20090612 Address after: Shanghai City, Minhang District Jianchuan Road No. 1115 Patentee after: Power Equipment Engineering Co., Ltd. of Shanghai Power Equipment Research Institute Address before: Shanghai Jianchuan Road No. 1115 Patentee before: Shanghai Design Inst of Complete Set of Electric Generation Equipment |
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Granted publication date: 20070725 Termination date: 20131010 |