CN112282872A - Adjustable heat recovery system of ultra supercritical steam turbine - Google Patents
Adjustable heat recovery system of ultra supercritical steam turbine Download PDFInfo
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- CN112282872A CN112282872A CN202011296792.3A CN202011296792A CN112282872A CN 112282872 A CN112282872 A CN 112282872A CN 202011296792 A CN202011296792 A CN 202011296792A CN 112282872 A CN112282872 A CN 112282872A
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- 238000011084 recovery Methods 0.000 title claims description 9
- 238000000605 extraction Methods 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
An adjustable regenerative system of an ultra supercritical steam turbine comprises a high-pressure cylinder of the steam turbine, a boiler, a steam chamber and a No. 1 high-pressure heater; the steam turbine high-pressure cylinder is connected with the steam chamber and supplies steam through the steam chamber, a main steam outlet of the boiler is connected with the steam chamber, and the bottom of the steam turbine high-pressure cylinder is provided with a No. 0 steam extraction port and a No. 1 steam extraction port; the No. 1 high-pressure heater is connected with the high-pressure cylinder of the steam turbine through a No. 1 steam extraction port; the No. 0 steam extraction port and the No. 1 steam extraction port are respectively connected with a No. 0 steam pipeline and a No. 1 steam pipeline; no. 0 steam conduit and No. 1 steam conduit that the parallel arrangement assembles the back and is connected with No. 1 high pressure feed water heater through the trunk line to switch No. 1 high pressure feed water heater's vapour source to No. 0 steam extraction port by No. 1 steam extraction port under partial load. The invention can improve the working pressure of the No. 1 high-pressure heater under partial load, further improve the water supply temperature, and also overcome the problem that the zero high-pressure heater is difficult to be additionally arranged in a modified unit.
Description
Technical Field
The invention relates to an ultra-supercritical steam turbine unit, in particular to an adjustable regenerative system of an ultra-supercritical steam turbine.
Background
At present, the ultra supercritical steam turbine mostly adopts a traditional heat regeneration system, namely an eight-stage or nine-stage non-adjustable heat regeneration system and a one-stage adjustable heat regeneration system, wherein the one-stage adjustable heat regeneration system needs to be additionally provided with a zero high-pressure heater, the water supply temperature of partial load can be improved during operation, and the ultra supercritical steam turbine is used for improving the economic efficiency of a unit and is beneficial to desulfurization and denitrification of a boiler at partial load. For the through-flow modification unit, a zero-number high-pressure heater cannot be additionally arranged due to the limitation of field space, so that a primary adjustable regenerative system cannot be additionally arranged.
Disclosure of Invention
The invention provides an adjustable regenerative system for an ultra-supercritical steam turbine for a through-flow modification unit, aiming at overcoming the defects of the prior art.
The technical scheme of the invention is as follows:
an adjustable regenerative system of an ultra supercritical steam turbine comprises a steam turbine high pressure cylinder, a boiler, a steam chamber and a No. 1 high pressure heater; the steam turbine high-pressure cylinder is connected with the steam chamber and supplies steam through the steam chamber, a main steam outlet of the boiler is connected with the steam chamber, and the bottom of the steam turbine high-pressure cylinder is provided with a No. 0 steam extraction port and a No. 1 steam extraction port; the No. 1 high-pressure heater is connected with the high-pressure cylinder of the steam turbine through a No. 1 steam extraction port; the No. 0 steam extraction port and the No. 1 steam extraction port are respectively connected with a No. 0 steam pipeline and a No. 1 steam pipeline; no. 0 steam conduit and No. 1 steam conduit that the parallel arrangement assembles the back and is connected with No. 1 high pressure feed water heater through the trunk line to switch No. 1 high pressure feed water heater's vapour source to No. 0 steam extraction port by No. 1 steam extraction port under partial load.
Compared with the prior art, the invention has the beneficial effects that:
the invention improves the prior No. 1 steam pipeline, adds a No. zero steam extraction position and the steam pipeline, shares the No. 1 high-pressure heater, and switches the steam source of the No. 1 high-pressure heater from the No. 1 steam extraction port to the No. 0 steam extraction port when the steam turbine unit runs at partial load, thereby improving the water supply temperature of the partial load and further improving the economy of the partial load. The design and application of the adjustable heat regenerative system meet the requirement of increasing the water supply temperature during partial load with lower cost, and solve the problem that a zero-number high-pressure heater cannot be additionally arranged in a modified unit.
The invention fully utilizes the existing equipment, solves the problem that the No. 0 high-pressure heater cannot be additionally arranged due to the limitation of site, space and investment, improves the water supply temperature of the unit partial load through steam extraction switching, further improves the economy of the partial load, and is beneficial to the desulfurization and denitrification of the boiler at the partial load. After the No. 1 high-pressure heater is additionally provided with the No. 0 extraction steam source, the safety of the No. 1 high-pressure heater and related equipment can be ensured by switching the steam source under the working condition of 75 percent THA load, and the economical efficiency of the unit under the load of 75 percent THA and below can be improved. When the steam source of the No. 1 high-pressure heater is switched from the No. 1 steam extraction port to the No. 0 steam extraction port, the water supply temperature is finally increased by about 12 ℃, the circulation efficiency of the whole machine is slightly increased, the heat consumption level of the steam turbine is obviously reduced, and the heat consumption income value is about 13 kJ/kw.h.
The technical scheme of the invention is further explained by combining the drawings and the embodiment:
drawings
FIG. 1 is a schematic view of a high pressure cylinder of a steam turbine used in the present invention;
FIG. 2 is a schematic view of a thermodynamic system with a steam extraction port No. 0 and a steam pipeline No. 0 connected with a high-pressure heater No. 1;
FIG. 3 is a schematic diagram of the arrangement of steam pipes No. 0 and No. 1;
FIG. 4 is a graph of heat loss gain at part load;
fig. 5 is a schematic diagram of a thermodynamic system of a newly built unit.
Detailed Description
Referring to fig. 1-3, the adjustable heat recovery system of the ultra supercritical steam turbine of the present invention includes a steam turbine high pressure cylinder 1, a boiler 2, a steam chamber 3 and a number 1 high pressure heater 4; the steam turbine high-pressure cylinder 1 is connected with the steam chamber 3 and supplies steam from the steam chamber 3, a main steam outlet of the boiler 2 is connected with the steam chamber 2, and the bottom of the steam turbine high-pressure cylinder 1 is provided with a No. 0 steam extraction port 1-0 and a No. 1 steam extraction port 1-1; the No. 1 high-pressure heater 4 is connected with the steam turbine high-pressure cylinder 1 through a No. 1 steam extraction port 1-1; the No. 1 high-pressure heater is communicated with the No. 2 high-pressure heater 7 to realize heat exchange. The turbine intermediate pressure cylinder 6 sends the steam to a No. 3 high pressure heater 8.
The No. O steam extraction port 1-0 and the No. 1 steam extraction port 1-1 are respectively connected with a No. 0 steam pipeline 1-01 and a No. 1 steam pipeline 1-11; the steam pipeline 1-01 and the steam pipeline 1-11 which are connected in parallel are converged and then connected with the high-pressure heater 4 through the main pipeline 1-2, so that the steam source of the high-pressure heater 4 1 is switched from the steam extraction port 1-1 to the steam extraction port 0 1-0 under partial load. The steam turbine set improves the existing No. 1 steam pipeline, a No. 1 steam extraction position and the steam pipeline are additionally arranged, the No. 1 high-pressure heater is shared, the steam source of the No. 1 high-pressure heater is switched from the No. 1 steam extraction port to the No. 0 steam extraction port when the steam turbine set runs at partial load, the water supply temperature of the partial load can be improved, and the economical efficiency of the partial load is further improved
Furthermore, a temperature reducer 5-1, a pneumatic drain valve 5-2, a pneumatic check valve 5-3 and a pneumatic regulating valve 5-4 are sequentially arranged on a No. 0 steam pipeline 1-01 from a No. 0 steam extraction port 1-0 to a No. 1 high-pressure heater 4, and the temperature-reduced water of the temperature reducer 5-1 is taken from a water supply pump 9. Electric gate valves 5-6 are respectively arranged on the No. 0 steam pipeline 1-01, between the pneumatic check valve 5-3 and the pneumatic regulating valve 5-4, and between the pneumatic regulating valve 5-4 and the No. 1 high-pressure heater 4. In order to prevent the unit from entering the steam extraction port No. 1 from the steam extraction port No. 0 when a steam source is switched, a pneumatic regulating valve 5-4 with a quick shutoff function is additionally arranged on the steam pipeline No. 1, and a check valve is replaced (if needed), so that the steam extraction port No. 1-1 is in an isolated state when the steam extraction port No. 0 is used 1-0. And drain valves are respectively arranged at the lowest points of the No. 0 steam pipeline and the pipeline, so that when the unit is started, stopped and the high-pressure heater breaks down, no water is accumulated in the system, and each drain pipeline is independently connected to the drain flash tank of the condenser.
A pneumatic check valve 5-3 and an electric stop valve 5-5 are sequentially arranged on a steam pipeline 1-11 from a steam extraction port 1-1 to a high-pressure heater 4 1. An electric stop valve 5-5 connected with the electric gate valve 5-6 in parallel is also arranged between the pneumatic check valve 5-3 and the pneumatic regulating valve 5-4. And the number 0 steam pipeline 1-01 can be put into operation at any time.
Furthermore, on the No. 0 steam pipeline 1-01, a pneumatic regulating valve 5-4 and a pressure sensor and a temperature sensor on the No. 1 high-pressure heater 4 are in interlocking control. So set up, ensure 1 # high pressure feed water heater reliable and stable operation.
In an embodiment, an adjustable regenerative system of an ultra supercritical steam turbine is designed according to a through flow modification project of a 1030MW ultra supercritical unit. The newly-built unit can effectively relieve the reduction range of the final water supply temperature of the unit by additionally arranging a No. 0 high-pressure heater to improve the operation economy of the unit at partial load, and a schematic diagram of a thermodynamic system is shown in FIG. 5, wherein the No. 1 heater below the right side of the diagram is the No. 0 high-pressure heater. For the through-flow modification unit, the number 0 high-pressure heater cannot be additionally arranged due to the limitation of field space, so that the adjustable heat recovery system of the embodiment is respectively connected with the number 0 steam pipeline 1-01 and the number 1 steam pipeline 1-11 through the number 0 steam extraction port 1-0 and the number 1 steam extraction port 1-1; the steam pipeline 1-01 and the steam pipeline 1-11 which are connected in parallel are converged and then connected with the high-pressure heater 4 No. 1 through the main pipeline 1-2, so that the steam source of the high-pressure heater 4 No. 1 is switched from the steam extraction port 1-1 No. 1 to the steam extraction port 1-0 No. 0 under partial load, the working pressure of the high-pressure heater 1 under partial load is improved, the water supply temperature is further improved, and the partial schematic diagram of the system is shown in the figure 1 and the figure 3.
For the improved unit, the equipment such as the No. 1 high-pressure heater, the No. 1 steam pipeline, the boiler and the like are all the existing equipment, so the safety margins of the equipment need to be considered when the steam extraction position of the No. 0 steam extraction port 1-0 is selected. When the million units are subjected to flow transformation, 75% THA working conditions are used as steam source switching load points of the No. 1 high-pressure heater. After accounting, when the position of the No. 0 steam extraction port 1-0 is positioned behind the high-pressure 10-level, the No. 1 high-pressure heater and related equipment can meet the requirement of safe operation, and the specific parameters are detailed in the table 1.
Table 1: comparison of No. 1 high-steam-supply source switching parameters under 75% THA working condition of typical unit
A steam turbine high-pressure cylinder 1 is newly designed with a No. 0 steam extraction opening 1-0, a No. 0 steam pipeline 1-01, a desuperheater, an adjusting valve and the like are led from the No. 0 steam extraction opening 1-0, and the steam extraction opening 1-0 and the No. 1 steam pipeline are connected in parallel to be connected into a No. 1 high-pressure heater. The desuperheating water is taken from a water supply system at the outlet of a water supply pump, and meanwhile, the lowest points of a steam extraction pipeline and a pipeline are respectively provided with a dewatering point so as to ensure that no water is accumulated in the system when the unit is started, stopped and a heater fails, and each dewatering pipeline is independently connected to a condenser dewatering flash tank. For preventing that unit when switching the vapour source 0 number extraction steam from getting into 1 number high pressure feed ware, add the block on the pipeline and close the governing valve, change check valve (if needs), guarantee when using 0 number steam conduit extraction, 1 number steam conduit is in isolated state.
After a steam source of a steam pipeline 1-01 No. 0 is additionally arranged on a high-pressure heater No. 1 of the unit, the safety of the high-pressure heater No. 1 and related equipment can be ensured by switching the steam source under the working condition of 75% THA load, and meanwhile, the economical efficiency of the unit under the load of 75% THA and below can be improved. Table 2 shows the operating parameters and cycle efficiency of the unit under part load with No. 1 high pressure heater using No. 1 extraction port as the steam source.
Table 2: thermodynamic cycle parameters and load relation of each load when steam extraction port No. 1 of million units is used as steam source
Table 3 shows the operating parameters and cycle efficiency of the unit under part load with No. 1 high pressure heater using No. 0 extraction port as the steam source.
Table 3: thermodynamic cycle parameters and load relation of each load when 0 steam extraction port of million units is used as steam source
By comparing the results in tables 2 and 3, after the high-pressure heater No. 1 is used as a steam source to switch the steam extraction port from the steam extraction port No. 1 to the steam extraction port No. 0, the final feed water temperature is increased by about 12 ℃, the feed water temperature increase has no influence on the safety and efficiency of the boiler through boiler accounting, the cycle efficiency of the whole machine is slightly increased, the heat consumption level of the steam turbine is obviously reduced, and the economic benefits of each load are shown in a figure 4.
The present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the invention.
Claims (6)
1. An adjustable regenerative system of an ultra supercritical steam turbine comprises a steam turbine high pressure cylinder (1), a boiler (2), a steam chamber (3) and a No. 1 high pressure heater (4); the steam turbine high-pressure cylinder (1) is connected with the steam chamber (3) and supplies steam from the steam chamber (3), a main steam outlet of the boiler (2) is connected with the steam chamber (3), and the bottom of the steam turbine high-pressure cylinder (1) is provided with a No. 0 steam extraction opening (1-0) and a No. 1 steam extraction opening (1-1); the No. 1 high-pressure heater (4) is connected with a high-pressure cylinder (1) of the steam turbine through a No. 1 steam extraction port (1-1);
the method is characterized in that: the No. 0 steam extraction port (1-0) and the No. 1 steam extraction port (1-1) are respectively connected with a No. 0 steam pipeline (1-01) and a No. 1 steam pipeline (1-11); the steam pipeline No. 0 (1-01) and the steam pipeline No. 1 (1-11) which are arranged in parallel are converged and then connected with the high-pressure heater No. 1 (4) through the main pipeline (1-2) so as to switch the steam source of the high-pressure heater No. 1 (4) from the steam extraction port No. 1 (1-1) to the steam extraction port No. 0 (1-0) under partial load.
2. The adjustable heat recovery system of the ultra supercritical steam turbine according to claim 1, wherein: a desuperheater (5-1), a pneumatic drain valve (5-2), a pneumatic check valve (5-3) and a pneumatic regulating valve (5-4) are sequentially arranged on a No. 0 steam pipeline (1-01) from a No. 0 steam extraction port (1-0) to a No. 1 high-pressure heater (4), and the desuperheater of the desuperheater (5-1) is taken from a water supply pump.
3. The adjustable heat recovery system of the ultra supercritical steam turbine according to claim 2, wherein: a pneumatic check valve (5-3) and an electric stop valve (5-5) are sequentially arranged on a steam pipeline (1-11) from a steam extraction port (1-1) to a high-pressure heater (4) 1.
4. The adjustable heat recovery system of the ultra supercritical steam turbine according to claim 2 or 3, characterized in that: electric gate valves (5-6) are respectively arranged on the No. 0 steam pipeline (1-01), between the pneumatic check valve (5-3) and the pneumatic regulating valve (5-4), and between the pneumatic regulating valve (5-4) and the No. 1 high-pressure heater (4).
5. The adjustable heat recovery system of the ultra supercritical steam turbine according to claim 4, wherein: an electric stop valve (5-5) which is connected with the electric gate valve (5-6) in parallel is also arranged between the pneumatic check valve (5-3) and the pneumatic regulating valve (5-4).
6. The adjustable heat recovery system of the ultra supercritical steam turbine according to claim 5, wherein: on the No. 0 steam pipeline (1-01), a pneumatic regulating valve (5-4) and a pressure sensor and a temperature sensor on the No. 1 high-pressure heater (4) are in interlocking control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296792.3A CN112282872A (en) | 2020-11-18 | 2020-11-18 | Adjustable heat recovery system of ultra supercritical steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296792.3A CN112282872A (en) | 2020-11-18 | 2020-11-18 | Adjustable heat recovery system of ultra supercritical steam turbine |
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| CN202011296792.3A Pending CN112282872A (en) | 2020-11-18 | 2020-11-18 | Adjustable heat recovery system of ultra supercritical steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236382A (en) * | 2021-05-28 | 2021-08-10 | 西安热工研究院有限公司 | Secondary reheating 650 ℃ ultra-supercritical unit system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2292857A1 (en) * | 1974-11-29 | 1976-06-25 | Hitachi Ltd | Steam turbine generating plant - with selective return of high pressure exhaust steam to feedwater heater |
| CN203685322U (en) * | 2013-12-24 | 2014-07-02 | 河北省电力勘测设计研究院 | Steam extraction heat supply system for 350MW supercritical heat supply unit |
| CN203756252U (en) * | 2014-03-20 | 2014-08-06 | 王振宇 | Turbine regenerative system of ultra supercritical unit |
| CN104061564A (en) * | 2014-07-16 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | 0# high-pressure heater system with back heating crossing units |
| CN106050337A (en) * | 2016-07-29 | 2016-10-26 | 南京电力设备质量性能检验中心 | Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set |
| WO2017219656A1 (en) * | 2016-06-23 | 2017-12-28 | 章礼道 | Gas turbine and pressurized water reactor steam turbine combined circulation system |
| CN213419176U (en) * | 2020-11-18 | 2021-06-11 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
-
2020
- 2020-11-18 CN CN202011296792.3A patent/CN112282872A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2292857A1 (en) * | 1974-11-29 | 1976-06-25 | Hitachi Ltd | Steam turbine generating plant - with selective return of high pressure exhaust steam to feedwater heater |
| CN203685322U (en) * | 2013-12-24 | 2014-07-02 | 河北省电力勘测设计研究院 | Steam extraction heat supply system for 350MW supercritical heat supply unit |
| CN203756252U (en) * | 2014-03-20 | 2014-08-06 | 王振宇 | Turbine regenerative system of ultra supercritical unit |
| CN104061564A (en) * | 2014-07-16 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | 0# high-pressure heater system with back heating crossing units |
| WO2017219656A1 (en) * | 2016-06-23 | 2017-12-28 | 章礼道 | Gas turbine and pressurized water reactor steam turbine combined circulation system |
| CN106050337A (en) * | 2016-07-29 | 2016-10-26 | 南京电力设备质量性能检验中心 | Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set |
| CN213419176U (en) * | 2020-11-18 | 2021-06-11 | 哈尔滨汽轮机厂有限责任公司 | Adjustable heat recovery system of ultra supercritical steam turbine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236382A (en) * | 2021-05-28 | 2021-08-10 | 西安热工研究院有限公司 | Secondary reheating 650 ℃ ultra-supercritical unit system |
| CN113236382B (en) * | 2021-05-28 | 2022-08-30 | 西安热工研究院有限公司 | Secondary reheating 650 ℃ ultra-supercritical unit system |
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