CN215486189U - Thermal power generating unit load rapid adjusting system for coupling steam energy storage - Google Patents
Thermal power generating unit load rapid adjusting system for coupling steam energy storage Download PDFInfo
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Abstract
The utility model discloses a load quick adjusting system of a thermal power generating unit coupled with steam energy storage. The technical scheme of the utility model comprises the following steps: the heat storage tank is connected with the main steam pipeline through the heat storage pipeline, and the heat storage tank is connected with the reheating steam pipeline through the heat release pipeline; the heat storage pipeline and the heat release pipeline are respectively provided with a pressure reducing device, the heat storage tank is provided with a pressure measuring device, and the heat storage pipeline and the heat release pipeline are respectively provided with a flow control device and an isolation valve. When the unit needs to rapidly increase a certain amount of load, the steam stored in the heat storage tank is sent to the reheating steam pipeline, so that the steam flowing in the steam turbine is increased, and the capacity of rapidly adjusting the load of the unit can be improved by storing the steam in the heat storage tank.
Description
Technical Field
The utility model belongs to the technical field of steam utilization systems, and particularly relates to a load quick adjustment system of a thermal power generating unit coupled with steam energy storage.
Background
In recent years, with the development of large-scale grid connection of intermittent energy sources such as large-scale photovoltaic and wind power and extra-high voltage external power transmission, larger peak-load and frequency-modulation pressure is caused to a receiving-end power grid. The load adjustment of the conventional thermal power generating unit is reliable, is a common peak-load and frequency modulation resource in a power grid, and the frequency modulation capability of the conventional thermal power generating unit needs to be further improved through technical measures to meet the requirement of the development of a new-era power system.
In the past, if a thermal power generating unit needs to adjust a certain amount of load, the adjustment needs to be carried out by adjusting the coal feeding amount and the water feeding amount of a boiler, certain hysteresis is provided, and the load adjustment by controlling the opening degree of a steam turbine regulating valve has short response time but short continuous response time; meanwhile, when the load of the unit needs to be reduced rapidly, the unit is sometimes affected by problems such as the limitation of the minimum coal quantity of the coal mill, and the response capability of the unit to the power grid is insufficient.
Therefore, it is an urgent problem to be solved by those skilled in the art to provide a system capable of rapidly adjusting a part load of a unit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides a thermal power generating unit load rapid regulation system for coupling steam energy storage, when a unit needs to reduce a certain amount of load rapidly, part of steam in a main steam pipeline is sent into a heat storage tank in the load regulation system for storage, so that the steam flowing through a steam turbine can be reduced, when the unit needs to increase a certain amount of load rapidly, the steam stored in the heat storage tank in the load regulation system is sent into a reheating steam pipeline, so that the steam flowing through the steam turbine is increased, and a certain amount of steam is stored and released through the load regulation system so as to improve the load rapid regulation capability of the unit.
Therefore, the utility model adopts the following technical scheme: the load quick adjustment system of the thermal power generating unit for coupling steam energy storage comprises a heat storage tank, a heat storage pipeline and a heat release pipeline;
the heat storage tank is connected with the main steam pipeline through a heat storage pipeline, and the heat storage tank is connected with the reheating steam pipeline through a heat release pipeline;
the heat storage pipeline and the heat release pipeline are respectively provided with a pressure reducing device, the heat storage tank is provided with a pressure measuring device, and the heat storage pipeline and the heat release pipeline are respectively provided with a flow control device and an isolation valve.
Furthermore, a heat storage bypass pipeline is arranged on the heat storage pipeline.
Furthermore, a heat release bypass pipeline is arranged on the heat release pipeline.
Furthermore, the main steam pipeline is connected with the boiler and the high-pressure cylinder of the steam turbine, and the reheat steam pipeline is connected with the boiler and the intermediate-pressure cylinder of the steam turbine;
the high-pressure cylinder steam exhaust pipeline is connected with the steam turbine intermediate pressure cylinder and the boiler, the intermediate pressure cylinder steam exhaust pipeline is connected with the steam turbine intermediate pressure cylinder, the first steam turbine low-pressure cylinder and the second steam turbine low-pressure cylinder, and the low-pressure cylinder steam exhaust pipeline is connected with the first steam turbine low-pressure cylinder, the second steam turbine low-pressure cylinder and the condenser.
Further, the thermal power generating unit load rapid adjusting system further comprises a water supply pipeline, the water supply pipeline is connected with a boiler and a condenser, and a first high-pressure heater, a second high-pressure heater, a third high-pressure heater, a deaerator, a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater are arranged on the water supply pipeline.
Furthermore, the thermal power generating unit load rapid adjustment system further comprises a first steam extraction pipeline, a second steam extraction pipeline, a third steam extraction pipeline, a fourth steam extraction pipeline, a fifth steam extraction pipeline, a sixth steam extraction pipeline, a seventh steam extraction pipeline and an eighth steam extraction pipeline;
the first steam extraction pipeline is connected with a high-pressure cylinder of the steam turbine and the first high-pressure heater, and the second steam extraction pipeline is connected with a steam exhaust pipeline of the high-pressure cylinder and the second high-pressure heater.
Further, the third steam extraction pipeline is connected with a steam turbine intermediate pressure cylinder and a third high-pressure heater; and the fourth steam extraction pipeline is connected with a steam turbine intermediate pressure cylinder and a deaerator.
Furthermore, the fifth steam extraction pipeline is connected with the steam exhaust pipeline of the intermediate pressure cylinder and the first low-pressure heater; and the sixth steam extraction pipeline is connected with the first steam turbine low-pressure cylinder, the second steam turbine low-pressure cylinder and the second low-pressure heater.
Furthermore, the seventh steam extraction pipeline is connected with the first low-pressure turbine cylinder, the second low-pressure turbine cylinder and the third low-pressure heater.
Furthermore, the eighth steam extraction pipeline is connected with the first low-pressure turbine cylinder, the second low-pressure turbine cylinder and the fourth low-pressure heater.
The utility model has the following beneficial effects: when the unit needs to reduce a certain amount of load quickly, part of steam in the main steam pipeline is sent into a heat storage tank in the load adjusting system for storage, so that the steam flowing through the steam turbine can be reduced; when the unit needs to increase a certain amount of load quickly, steam stored in a heat storage tank in the load adjusting system is sent to a reheating steam pipeline, so that the steam flowing through a steam turbine is increased, and the capacity of quickly adjusting the load of the unit can be improved by storing and releasing a certain amount of steam through the load adjusting system.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-supercritical unit.
101-boiler, 102-high pressure cylinder of turbine, 103-medium pressure cylinder of turbine, 104-first low pressure cylinder of turbine, 105-second low pressure cylinder of turbine, 106-condenser, 107-first high pressure heater, 108-second high pressure heater, 109-third high pressure heater, 110-deaerator, 111-first low pressure heater, 112-second low pressure heater, 113-third low pressure heater, 114-fourth low pressure heater, 115-first extraction pipeline, 116-second extraction pipeline, 117-third extraction pipeline, 118-fourth extraction pipeline, 119-fifth extraction pipeline, 120-sixth extraction pipeline, 121-seventh extraction pipeline, 122-eighth extraction pipeline, 123-main steam pipeline, 124-reheating steam pipeline, 125-high pressure cylinder steam exhaust pipeline, 126-intermediate pressure cylinder steam exhaust pipeline, 127-low pressure cylinder steam exhaust pipeline and 128-water supply pipeline.
Fig. 2 is a schematic structural diagram of the present invention.
201-heat accumulation tank, 202-heat accumulation pipeline, 203-heat release pipeline, 204-pressure reducing device, 205-pressure measuring device, 206-flow measuring device, 207-isolation valve, 208-heat accumulation bypass pipeline and 209-heat release bypass pipeline.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention. It should be understood that the embodiments described herein are only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.
FIG. 1 is a schematic structural diagram of an ultra-supercritical unit. The turbine of the unit is an ultra supercritical 1000MW, once intermediate reheating, four-cylinder four-steam-discharge and condensing steam turbine. The steam turbine high-pressure cylinder 102, the steam turbine intermediate-pressure cylinder 103, the first steam turbine low-pressure cylinder 104 and the second steam turbine low-pressure cylinder 105 are coaxially arranged, and the steam turbine high-pressure cylinder 102 and the steam turbine intermediate-pressure cylinder 103 are symmetrically arranged. The unit is further provided with a boiler 101, a condenser 106, a first high-pressure heater 107, a second high-pressure heater 108, a third high-pressure heater 109, a deaerator 110, a first low-pressure heater 111, a second low-pressure heater 112, a third low-pressure heater 113, and a fourth low-pressure heater 114.
The main steam line 123 connects the boiler 101 and the turbine high-pressure cylinder 102, the reheat steam line 124 connects the boiler 101 and the turbine intermediate-pressure cylinder 103, the high-pressure cylinder exhaust line 125 connects the turbine intermediate-pressure cylinder 103 and the boiler 101, the intermediate-pressure cylinder exhaust line 126 connects the turbine intermediate-pressure cylinder 103, the first turbine low-pressure cylinder 104, and the second turbine low-pressure cylinder 105, and the low-pressure cylinder exhaust line 127 connects the first turbine low-pressure cylinder 104, the second turbine low-pressure cylinder 105, and the condenser 106.
The water supply line 128 connects the boiler 101 and the condenser 106, and the first high-pressure heater 107, the second high-pressure heater 108, the third high-pressure heater 109, the deaerator 110, the first low-pressure heater 111, the second low-pressure heater 112, the third low-pressure heater 113, and the fourth low-pressure heater 114 are disposed on the water supply line 128.
The first steam extraction pipeline 115 connects the turbine high-pressure cylinder 102 and the first high-pressure heater 107, the second steam extraction pipeline 116 connects the high-pressure cylinder steam exhaust pipeline 125 and the second high-pressure heater 108, the third steam extraction pipeline 117 connects the turbine intermediate-pressure cylinder 103 and the third high-pressure heater 109, the fourth steam extraction pipeline 118 connects the turbine intermediate-pressure cylinder 103 and the deaerator 110, the fifth steam extraction pipeline 119 connects the intermediate-pressure cylinder steam exhaust pipeline 126 and the first low-pressure heater 111, the sixth steam extraction pipeline 120 connects the first turbine low-pressure cylinder 104, the second turbine low-pressure cylinder 105 and the second low-pressure heater 112, the seventh steam extraction pipeline 121 connects the first turbine low-pressure cylinder 104, the second turbine low-pressure cylinder 105 and the third low-pressure heater 113, and the eighth steam extraction pipeline 122 connects the first turbine low-pressure cylinder 104, the first turbine low-pressure cylinder 105 and the fourth low-pressure heater 114.
The feed water flows out of the condenser 106, passes through the fourth low-pressure heater 114, the third low-pressure heater 113, the second low-pressure heater 112, the first low-pressure heater 111, the deaerator 110, the third high-pressure heater 109, the second high-pressure heater 108, and the first high-pressure heater 107 in this order, and enters the boiler 101. The feed water absorbs heat in the boiler 101 to generate steam, and the steam flows through the turbine high-pressure cylinder 102, the high-pressure cylinder exhaust line 105, the boiler 101, the turbine intermediate-pressure cylinder 103, the intermediate-pressure cylinder exhaust line 126, the first turbine low-pressure cylinder 104, the second turbine low-pressure cylinder 105, and the low-pressure cylinder exhaust line 127 in this order, and then enters the condenser 106 to release heat to generate feed water, thereby forming a cycle.
FIG. 2 is a schematic structural diagram of the present invention. The heat storage pipeline 202 is connected with the main steam pipeline 123 and the heat storage tank 201, the heat release pipeline 203 is connected with the heat storage tank 201 and the reheat steam pipeline 124, the heat storage pipeline 202 is provided with a pressure reducing device 204, the heat release pipeline 203 is provided with a pressure reducing device 204, the heat storage tank 201 is provided with a pressure measuring device 205, the heat storage pipeline 202 and the heat release pipeline 203 are provided with a flow control device 206 and an isolation valve 207, the heat storage pipeline 202 is provided with a heat storage bypass pipeline 208, and the heat release pipeline 203 is provided with a heat release bypass pipeline 209.
Table 1 shows the steam pressure and temperature parameters for each typical load main steam line 123 and reheat steam line 124 in the 40% to 100% rated load range of the unit.
TABLE 1 typical load steam pressure and temperature parameters
If the utility model can be put into operation in the range of 40-100% of rated load of the unit, the pressure of the heat storage tank 201 needs to be controlled to be maintained above 6.0MPa, the actual pressure is maintained at 6.0-10.0 MPa, and the pressure is measured by the pressure measuring device 205. When the unit needs to reduce a certain amount of load quickly, the isolation valve 207 on the heat storage pipeline 202 is kept in an open state, the isolation valve 207 on the heat release pipeline 203 is kept in a closed state, steam in the main steam pipeline 123 needs to be depressurized to 6.0-10.0 MPa and then is sent into the heat storage tank 201, so that the steam flow in the steam turbine high-pressure cylinder 102, the steam turbine intermediate-pressure cylinder 103, the first steam turbine low-pressure cylinder 104 and the second steam turbine low-pressure cylinder 105 is reduced, the pressure is reduced by the pressure reducing device 204, and the flow is controlled by the flow control device 206. Table 2 shows the temperature of the steam in the main steam pipeline 123 after being decompressed by the decompressor 204 in the range of 40% -100% of rated load of the unit, and the temperature of the decompressed steam is 524-599 ℃.
TABLE 2 temperatures after steam depressurization for each typical load
When the unit needs to increase a certain amount of load quickly, the isolation valve 207 on the heat storage pipeline 202 is kept in a closed state, the isolation valve 207 on the heat release pipeline 203 is kept in an open state, steam in the heat storage tank 201 needs to be depressurized to the pressure of the reheat steam pipeline 124 and then is sent to the reheat steam pipeline 124, so that the steam flow flux in the first steam turbine low-pressure cylinder 104 and the second steam turbine low-pressure cylinder 105 is increased, the pressure is reduced by the pressure reducing device 204, and the flow is controlled by the flow control device 206. Tables 3 to 8 show the temperatures after the pressure in the heat storage tank 201 is reduced to 2.2 to 5.5MPa by the pressure reducing device 204 while maintaining the vapor pressures at 6.0, 8.0, and 10.0MPa, respectively, and the temperatures at 524 and 599 ℃. The temperature of the steam after pressure reduction is 487-597 ℃ which is lower than the temperature of the reheat steam in a unit 40% -100% rated load range, if the amount of the injected reduced pressure steam is too much, the temperature of the reheat steam can be obviously reduced, the safe and stable operation of the unit is not facilitated, and the amount of the injected steam generally should not exceed 20% of the flow of the reheat steam. Table 9 shows the unit load reduction at full load when the main steam flow is 10% and 5% of the main steam total flow. Table 10 shows the amount of load added to the unit when the amount of extraction steam injected is 10% and 5% of the reheat steam flow at full load. The results in table 10 are calculated at a pressure of 6.0MPa and a temperature of 599 c in the regenerator 201, and if the pressure of the regenerator 201 is higher than 6.0MPa and the temperature is lower than 599 c, the increased load is smaller than the results calculated in table 10.
TABLE 3 temperature of the regenerator after steam depressurization (regenerator pressure 6.0MPa, temperature 524 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reducing the pressure to 2.2MPa | 506 |
| Reducing the pressure to 4.0MPa | 515 |
| Reducing the pressure to 5.5MPa | 522 |
TABLE 4 temperature of the regenerator after steam depressurization (regenerator pressure 6.0MPa, temperature 599 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reducing the pressure to 2.2MPa | 585 |
| Reducing the pressure to 4.0MPa | 592 |
| Reducing the pressure to 5.5MPa | 597 |
TABLE 5 temperature of the regenerator after steam depressurization (regenerator pressure 8.0MPa, temperature 524 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reducing the pressure to 2.2MPa | 497 |
| Reducing the pressure to 4.0MPa | 506 |
| Reducing the pressure to 5.5MPa | 513 |
TABLE 6 temperature of the regenerator after steam depressurization (regenerator pressure 8.0MPa, temperature 599 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reducing the pressure to 2.2MPa | 578 |
| Reducing the pressure to 4.0MPa | 585 |
| Reducing the pressure to 5.5MPa | 590 |
TABLE 7 temperature of the heat storage tank after steam pressure reduction (pressure of the heat storage tank 10.0MPa, temperature 522 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reducing the pressure to 2.2MPa | 487 |
| Reducing the pressure to 4.0MPa | 496 |
| Reducing the pressure to 5.5MPa | 503 |
TABLE 8 temperature of the regenerator after steam depressurization (regenerator pressure 10.0MPa, temperature 599 ℃ C.)
| Temperature after decompression (. degree.C.) | |
| Reduced pressureTo 2.2MPa | 571 |
| Reducing the pressure to 4.0MPa | 578 |
| Reducing the pressure to 5.5MPa | 583 |
TABLE 9 reduction of load of unit
| Extracting main steam flow | Load reduction of the machine set (MW) |
| 10％ | 100 |
| 5％ | 50 |
TABLE 10 increasing load of the unit (6.0 MPa pressure of the accumulator, 599 deg.C)
| Flow of injected reheat steam | Increased load capacity (Mw) of the unit |
| 10％ | 85 |
| 5％ | 42.5 |
When the system runs daily and the unit does not need to increase or decrease a certain amount of load quickly, the isolation valve 207 on the heat storage pipeline 202 and the isolation valve 207 on the heat release pipeline 203 are normally in a closed state, and in order to keep the steam temperature in the heat storage tank 201, a certain steam flow rate of the heat storage tank 201 needs to be kept, therefore, the system is further provided with a heat storage bypass pipeline 208 and a heat release bypass pipeline 209, and the daily steam flow rates in the heat storage bypass pipeline 208 and the heat release bypass pipeline 209 are kept at 1 t/h.
Claims (10)
1. A thermal power generating unit load rapid regulation system for coupling steam energy storage is characterized by comprising a heat storage tank (201), a heat storage pipeline (202) and a heat release pipeline (203),
the heat storage tank (201) is connected with a main steam pipeline (123) through a heat storage pipeline (202), and the heat storage tank (201) is connected with a reheating steam pipeline (124) through a heat release pipeline (203);
the heat storage pipeline (202) and the heat release pipeline (203) are respectively provided with a pressure reducing device (204), the heat storage tank (201) is provided with a pressure measuring device (205), and the heat storage pipeline (202) and the heat release pipeline (203) are respectively provided with a flow control device (206) and an isolation valve (207).
2. The load rapid regulation system of the thermal power generating unit coupled with the steam thermal storage according to claim 1, characterized in that a thermal storage bypass pipeline (208) is arranged on the thermal storage pipeline (202).
3. The load rapid adjustment system of the thermal power generating unit coupled with the steam storage according to claim 1, characterized in that a heat release bypass pipeline (209) is arranged on the heat release pipeline (203).
4. The load rapid-adjustment system for the thermal power generating unit coupled with the steam energy storage according to any one of claims 1 to 3, characterized in that a main steam pipeline (123) is connected with the boiler (101) and the high-pressure turbine cylinder (102), and a reheat steam pipeline (124) is connected with the boiler (101) and the medium-pressure turbine cylinder (103);
the high-pressure cylinder steam exhaust pipeline (125) is connected with the steam turbine intermediate pressure cylinder (103) and the boiler (101), the intermediate pressure cylinder steam exhaust pipeline (126) is connected with the steam turbine intermediate pressure cylinder (103), the first steam turbine low-pressure cylinder (104) and the second steam turbine low-pressure cylinder (105), and the low-pressure cylinder steam exhaust pipeline (127) is connected with the first steam turbine low-pressure cylinder (104), the second steam turbine low-pressure cylinder (105) and the condenser (106).
5. The load rapid adjustment system of the thermal power generating unit coupled with the steam energy storage according to claim 4, characterized by further comprising a water supply pipeline (128), wherein the water supply pipeline (128) is connected with the boiler (101) and the condenser (106), and the water supply pipeline (128) is provided with a first high-pressure heater (107), a second high-pressure heater (108), a third high-pressure heater (109), a deaerator (110), a first low-pressure heater (111), a second low-pressure heater (112), a third low-pressure heater (113) and a fourth low-pressure heater (114).
6. The load rapid adjustment system of the thermal power generating unit coupled with the steam storage according to claim 5, further comprising a first steam extraction pipeline (115), a second steam extraction pipeline (116), a third steam extraction pipeline (117), a fourth steam extraction pipeline (118), a fifth steam extraction pipeline (119), a sixth steam extraction pipeline (120), a seventh steam extraction pipeline (121), and an eighth steam extraction pipeline (122);
the first steam extraction pipeline (115) is connected with a high-pressure cylinder (102) of the steam turbine and a first high-pressure heater (107), and the second steam extraction pipeline (116) is connected with a steam exhaust pipeline (125) of the high-pressure cylinder and a second high-pressure heater (108).
7. The load rapid-adjustment system for the thermal power generating unit coupled with the steam storage according to claim 6, wherein the third steam extraction pipeline (117) is connected with the turbine intermediate pressure cylinder (103) and the third high pressure heater (109); and the fourth steam extraction pipeline (118) is connected with the steam turbine intermediate pressure cylinder (103) and the deaerator (110).
8. The load rapid adjustment system of the thermal power generating unit coupled with steam accumulation according to claim 6, characterized in that the fifth steam extraction pipeline (119) is connected with a steam exhaust pipeline (126) of the intermediate pressure cylinder and the first low pressure heater (111); the sixth steam extraction pipe (120) connects the first low-pressure turbine cylinder (104), the second low-pressure turbine cylinder (105), and the second low-pressure heater (112).
9. The load rapid regulation system of the thermal power generating unit coupled with steam accumulation according to claim 6, characterized in that the seventh steam extraction pipe (121) connects the first low-pressure turbine cylinder (104), the second low-pressure turbine cylinder (105) and the third low-pressure heater (113).
10. The load rapid-adjustment system for a steam-charged thermal power generating unit according to claim 6, wherein the eighth steam extraction line (122) connects the first low-pressure turbine cylinder (104), the second low-pressure turbine cylinder (105), and the fourth low-pressure heater (114).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837763A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power generating unit flexible regulation and control system integrated with steam accumulator and working method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837763A (en) * | 2022-05-27 | 2022-08-02 | 华能国际电力股份有限公司 | Thermal power generating unit flexible regulation and control system integrated with steam accumulator and working method |
| CN114837763B (en) * | 2022-05-27 | 2023-05-05 | 华能国际电力股份有限公司 | Flexible regulation and control system of thermal power unit integrated with steam accumulator and working method |
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