CN201714437U - Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type - Google Patents
Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type Download PDFInfo
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- CN201714437U CN201714437U CN2010202248028U CN201020224802U CN201714437U CN 201714437 U CN201714437 U CN 201714437U CN 2010202248028 U CN2010202248028 U CN 2010202248028U CN 201020224802 U CN201020224802 U CN 201020224802U CN 201714437 U CN201714437 U CN 201714437U
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Abstract
The utility model relates to a steam turbine with steam extraction back pressure type changed from a double-steam-extraction condensing type. The reformed steam extraction back pressure type steam turbine is structurally characterized in that a front steam seal and a high-pressure steam chamber are connected with a front cylinder according to the structure, a first velocity-compounded stage and second to ten pressure stages are designed on a rotor arranged between the front cylinder and a middle steam cylinder, a back steam seal is positioned in a back cylinder, the middle cylinder is provided with a third-stage plugging scroll, a built-in steam seal and a balance weight ring, in addition, the balance weight ring can maintain the dynamic balance and the static balance of the rotor, the built-in steam seal is arranged in first stage and second stage plugging scrolls, the lower half part of the middle cylinder is provided with a back pressure steam exhaust opening, and a pressure regulation system is a low-pressure electro-hydraulic regulation system. The utility model can reform an obsolete CC25-8.83/1.27/0.49 type double-steam-extraction condensing type steam turbine group into a CB25-8.83/1.27/0.49 type steam extraction back pressure type steam turbine with little investment, so the utility model meets the national energy source policies of environment protection, energy saving and low carbon, and can make middle-size and small-size machine sets continuously play the role in the development of the national economy.
Description
Technical field
The utility model relates to the double extraction condensing structure of modification, relates in particular middle low power, high energy consumption, inefficient double extraction condensing with the low extraction back pressure turbine that drops into, is transformed into energy-saving and environmental protection, low-carbon (LC) cheaply.
Background technique
Draw gas below the 50MW, condensing steam turbine because generated output is little, heat capacity is less, heat energy do not obtain fully, rationally, effectively utilization.Do not meet China's power industry policy that " goes up big little, energy-saving and emission-reduction, the low-carbon economy of pressing ", many medium and small unit generations factory faces the condition of " shutting down, stop, merge and change ".How to make characteristics such as medium and small unit presents efficiently, energy-saving and environmental protection, low-carbon (LC), promptly press close to national energy policy, can make original employee of power plant keep " rice bowl " again, be the fact that our power generating equipment manufacturing enterprise faces, and is again the needs that we shoulder social responsibility.
Summary of the invention
The purpose of this utility model is by middle low power, high energy consumption, inefficient double extraction condensing being hanged down input, transform cheaply, making it become the extraction back pressure turbine of the cogeneration of energy-saving and environmental protection, low-carbon (LC).Through-flow rational in infrastructure, safe and reliable to operation through the extraction back pressure turbine of transforming, heat energy is fully used, and finds the effective way that continues to play a role for large quantities of medium and small units on the verge of being replaced simultaneously.
The technical solution of the utility model is:
Middle low power, high energy consumption, inefficient double extraction condensing are transformed into the extraction back pressure turbine of energy-saving and environmental protection, low-carbon (LC), improved extraction back pressure turbine is transformed Fig. 1 Central Plains turbine rotor, keep former steam turbine front steam seal and 1～10 grade of flow passage component, remove impellers all after 10 grades, blade, dividing plate, diaphragm housing ring, other adds the dynamic and static balance that the counterweight circle keeps rotor; Improved forward and backward bearing centre distance is constant, and is constant with the Placement of generator; Countercylinder is transformed: middle cylinder is transformed, and installs three grades of shutoff volutes additional, and sets up new built-in packing in the first order and shutoff volute place, the second level, and second is provided with the back pressure steam-expelling port middle cylinder; Former back packing keeps, the window shutoff at former rotating barrier connecting lever place, and former exhaust casing still keeps with the support unit as the steam turbine rear bearing; Regulating system: (DEH) is constant for former electro-hydraulic control system, and under design parameter, the DEH controller can keep static from whole to the adjusting of unit heat load, in heat load, when any one amount changes, cause the change of another regulated variable hardly, and electric load changes with the variation of heat load.Increase back pressure exhaust steam pressure protective gear, the Security that improves unit operation.
Black soy sauce vapour condensed steam type changes extraction back pressure turbine, by front steam seal, the high pressure steam chamber, preceding cylinder, the 1st grade of velocity-compounded stage, 2-10 stage pressure level, middle cylinder, the shutoff volute, built-in packing, the counterweight circle, exhaust casing, back packing, regulating system is formed, front steam seal links to each other with preceding cylinder according to structure with the high pressure steam chamber, design has the 1st grade of velocity-compounded stage on the rotor between preceding cylinder and the middle cylinder, 2-10 stage pressure level, back packing is positioned at exhaust casing, it is characterized in that: three grades of shutoff volutes are set at middle cylinder, built-in packing, the counterweight circle, and the counterweight circle can keep the moving of rotor, static balancing, built-in packing is arranged in the first order and the second level shutoff volute, second is provided with the back pressure steam-expelling port middle cylinder, and regulating system is the low tension hydraulic regulating system.
Thermodynamic system: 1) extraction back pressure turbine is identical with the design conditions of former double gass-out turbine, and main steam and feed water system, part backheat device systems (comprising high-pressure heater, higher-pressure deaerator etc.) parameter change little, uses so continue to keep.Remove 3 grades of low-pressure heaters of former unit.2) because back pressure machine Steam loss is big, former unit selfsealings system can not meet the demands, so increase a gland steam heater newly, former selfsealings system abandons.3) vapour condenser is abandoned, and glueballs cleans, pumped vacuum systems is abandoned, and circulation is stopped transport.Condenser hotwell uses as the chemistry filled water water tank.4) because of the user has requirement with the hydrophobic lower water box that causes of unit, so former hydrophobic expansion tank is abandoned, hydrophobic pipeline is done corresponding change.5) remove the back 3 sections bleed steam pipeworks that add to low, the back pressure exhaust line keeps former unit safety valve.6) sealing system transformation.Five grades of former unit front steam seals leak vapour and change fourth gear into and leak vapour, and first grade leaks vapour to oxygen-eliminating device, and second grade leaks vapour to the back pressure steam discharge, and third gear is leaked vapour to gland steam heater (the new setting), and fourth speed leaks vapour to gland steam heater (former unit portion cover).It is constant to oxygen-eliminating device that main stop valve valve rod high pressure leaks vapour, adjusting steam valve valve rod high pressure leaks vapour.To leak packing disconnected for two grades of packings behind the former unit, and the two-stage extraction steam pipe of cylinder is leaked vapour as two grades of back packing.Specifically be that φ 219 * 6 with the cylinder rear portion connects and changes φ 108 * 4 pipes into and leak vapour for first grade as the back packing, it leaks vapour to gland heater (the new setting).2-φ 325 * 8 connect change φ 108 * 4 pipes into and leak vapour as second grade of the packing in back, it leaks vapour to gland steam heater (former unit portion cover).
The forward and backward contrast of thermal parameter
| Sucking condensing turbine (before transforming) | Take out back of the body formula steam turbine (transforming the back) | |
| The steam turbine model | CC25-8.83/1.27/0.49 | CB25-8.83/1.27/0.49 |
| Initial steam pressure MPa | 8.83 | 8.83 |
| Initial steam temperature ℃ | 535 | 535 |
| Rated power MW | 30 | 25 |
| Rated speed r/min | 3000 | 3000 |
| Specified throttle flow t/h | 194 | 192 |
| Heat regenerative system | 2GJ+1CY+3DJ | 2GJ |
| Feed temperature ℃ | 215 | 216.8 |
| Heat supply pressure MPa | 1.27/0.49 | 1.27/0.49 |
| Heating steam amount t/h | 50/80 | 50/118 |
| Thermal loss of steam turbine kJ/kW.h | 5659 | 3641.8 |
| Centre distance mm before and after the steam turbine | 4993 | 4993 |
| Through-flow progression | 17 | 10 |
| The regulating system pattern | Low tension liquid is regulated | Low tension liquid is regulated |
Conclusion: above-mentioned renovation technique by the independent development of heat supply steam turbine research institute of China Changjiang Power Group Co. makes the small-sized double extraction condensing group that is in eliminating be transformed into less input and takes out back of the body machine, thereby meets the national energy policy of environmental protection, energy-conservation, low-carbon (LC).Increasing economic benefit and social benefit have been given play in the practical application of these model utility technology.
Description of drawings
Fig. 1 is the through-flow structure of CC25-8.83/1.27/0.49 type double extraction condensing before transforming.
Among the figure, packing, the 1st grade of velocity-compounded stage of 8-behind cylinder, 6-exhaust casing, the 7-among cylinder, the 5-before the 1-front steam seal, 2-regulating system, 3-high pressure steam chamber, 4-.
Fig. 2 is a through-flow structural representation of the present utility model.
Among the figure, packing, the 1st grade of velocity-compounded stage of 8-, 9-counterweight circle, the built-in packing of 10-, 11-2 to 10 stage pressure level, 12-shutoff volute behind cylinder, 6-exhaust casing, the 7-among cylinder, the 5-before the 1-front steam seal, 2-regulating system, 3-high pressure steam chamber, 4-.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
As shown in Figure 2, middle low power, high energy consumption, inefficient double extraction condensing are transformed into the extraction back pressure turbine of energy-saving and environmental protection, low-carbon (LC), improved extraction back pressure turbine is transformed Fig. 1 Central Plains turbine rotor, keep former steam turbine front steam seal and 1～10 grade of flow passage component, remove impellers all after 10 grades, blade, dividing plate, diaphragm housing ring, other adds the dynamic and static balance that the counterweight circle keeps rotor; Improved forward and backward bearing centre distance is constant, and is constant with the Placement of generator; Countercylinder is transformed: middle cylinder is transformed, and installs three grades of shutoff volutes additional, and sets up new built-in packing in the first order and shutoff volute place, the second level, and second is provided with the back pressure steam-expelling port middle cylinder.Former back packing keeps, the window shutoff at former rotating barrier connecting lever place, and former exhaust casing still keeps with the support unit as the steam turbine rear bearing.Regulating system: (DEH) is constant for former electro-hydraulic control system, and under design parameter, the DEH controller can keep static from whole to the adjusting of unit heat load, in heat load, when any one amount changes, cause the change of another regulated variable hardly, and electric load changes with the variation of heat load.Increase back pressure exhaust steam pressure protective gear, the Security that improves unit operation.
Black soy sauce vapour condensed steam type changes extraction back pressure turbine, by front steam seal, the high pressure steam chamber, preceding cylinder, the 1st grade of velocity-compounded stage, 2-10 stage pressure level, middle cylinder, the shutoff volute, built-in packing, the counterweight circle, exhaust casing, back packing, regulating system is formed, front steam seal links to each other with preceding cylinder according to structure with the high pressure steam chamber, design has the 1st grade of velocity-compounded stage on the rotor between preceding cylinder and the middle cylinder, 2-10 stage pressure level, back packing is positioned at exhaust casing, it is characterized in that: three grades of shutoff volutes are set at middle cylinder, built-in packing, the counterweight circle, and the counterweight circle can keep the moving of rotor, static balancing, built-in packing is arranged in the first order and the second level shutoff volute, second is provided with the back pressure steam-expelling port middle cylinder, and regulating system is the low tension hydraulic regulating system.
Thermodynamic system: 1) back pressure turbine is identical with the design conditions of extraction turbine, and main steam and feed water system, part backheat device systems (comprising high-pressure heater, higher-pressure deaerator etc.) parameter change little, uses so continue to keep.Remove 3 grades of low-pressure heaters of former unit.2) because back pressure machine Steam loss is big, former unit selfsealings system can not meet the demands, so increase a gland steam heater newly, former selfsealings system abandons.3) vapour condenser is abandoned, and glueballs cleans, pumped vacuum systems is abandoned, and circulation is stopped transport.Condenser hotwell uses as the chemistry filled water water tank.4) because of the user has requirement with the hydrophobic lower water box that causes of unit, so former hydrophobic expansion tank is abandoned, hydrophobic pipeline is done corresponding change.5) remove the back 3 sections bleed steam pipeworks that add to low, the back pressure exhaust line keeps former unit safety valve.6) sealing system transformation.Five grades of former unit front steam seals leak vapour and change fourth gear into and leak vapour, and first grade leaks vapour to oxygen-eliminating device, and second grade leaks vapour to the back pressure steam discharge, and third gear is leaked vapour to gland steam heater (the new setting), and fourth speed leaks vapour to gland steam heater (former unit portion cover).It is constant to oxygen-eliminating device that main stop valve valve rod high pressure leaks vapour, adjusting steam valve valve rod high pressure leaks vapour.To leak packing disconnected for two grades of packings behind the former unit, and the two-stage extraction steam pipe of cylinder is leaked vapour as two grades of back packing.Specifically be that φ 219 * 6 with the cylinder rear portion connects and changes φ 108 * 4 pipes into and leak vapour for first grade as the back packing, it leaks vapour to gland heater (the new setting).2-φ 325 * 8 connect change φ 108 * 4 pipes into and leak vapour as second grade of the packing in back, it leaks vapour to gland steam heater (former unit portion cover).
By the renovation technique of heat supply steam turbine research institute of China Changjiang Power Group Co. independent development the small-sized condensing steam turbine group of drawing gas that is in eliminating is transformed into less input and takes out back of the body machine, thereby meet the national energy policy of environmental protection, energy-conservation, low-carbon (LC).Increasing economic benefit and social benefit have been given play in the practical application of these model utility technology.
Claims (1)
1. black soy sauce vapour condensed steam type changes extraction back pressure turbine, by front steam seal, the high pressure steam chamber, preceding cylinder, the 1st grade of velocity-compounded stage, 2-10 stage pressure level, middle cylinder, the shutoff volute, built-in packing, the counterweight circle, exhaust casing, back packing, regulating system is formed, front steam seal links to each other with preceding cylinder according to structure with the high pressure steam chamber, design has the 1st grade of velocity-compounded stage on the rotor between preceding cylinder and the middle cylinder, 2-10 stage pressure level, back packing is positioned at exhaust casing, it is characterized in that: three grades of shutoff volutes are set at middle cylinder, built-in packing, the counterweight circle, and the counterweight circle can keep the moving of rotor, static balancing, built-in packing is arranged in the first order and the second level shutoff volute, second is provided with the back pressure steam-expelling port middle cylinder, and regulating system is the low tension hydraulic regulating system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202248028U CN201714437U (en) | 2010-06-08 | 2010-06-08 | Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202248028U CN201714437U (en) | 2010-06-08 | 2010-06-08 | Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type |
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| CN201714437U true CN201714437U (en) | 2011-01-19 |
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| CN2010202248028U Expired - Fee Related CN201714437U (en) | 2010-06-08 | 2010-06-08 | Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228158A (en) * | 2020-11-06 | 2021-01-15 | 国电泉州热电有限公司 | Novel subcritical 300MW steam turbine through-flow structure suitable for high-pressure extraction |
| CN114109525A (en) * | 2021-11-08 | 2022-03-01 | 中国长江动力集团有限公司 | Steam turbine shaft seal system |
| CN114278384A (en) * | 2021-12-15 | 2022-04-05 | 东方电气集团东方汽轮机有限公司 | Adjustable steam extraction type steam turbine axial thrust balancing structure and method |
-
2010
- 2010-06-08 CN CN2010202248028U patent/CN201714437U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228158A (en) * | 2020-11-06 | 2021-01-15 | 国电泉州热电有限公司 | Novel subcritical 300MW steam turbine through-flow structure suitable for high-pressure extraction |
| CN112228158B (en) * | 2020-11-06 | 2023-10-31 | 国电泉州热电有限公司 | Subcritical 300MW steam turbine through-flow structure adapting to high-pressure steam extraction |
| CN114109525A (en) * | 2021-11-08 | 2022-03-01 | 中国长江动力集团有限公司 | Steam turbine shaft seal system |
| CN114278384A (en) * | 2021-12-15 | 2022-04-05 | 东方电气集团东方汽轮机有限公司 | Adjustable steam extraction type steam turbine axial thrust balancing structure and method |
| CN114278384B (en) * | 2021-12-15 | 2023-08-01 | 东方电气集团东方汽轮机有限公司 | Axial thrust balancing structure and method for adjustable extraction steam turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20180608 |