CN112879110B - A thermal system with one furnace and two machines operating at ultra-low load and a switching method thereof - Google Patents
A thermal system with one furnace and two machines operating at ultra-low load and a switching method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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Abstract
本发明公开了一种一炉带两机超低负荷运行的热力系统及其切换方法，该系统包括两个单元制机组；第一单元制机组包括第一中压缸排汽门、第一减温减压阀、第一中压缸排汽调节汽门、第一汽缸冷却蒸汽管路等，第二单元制机组包括第二中压缸排汽门、第二减温减压阀、第二中压缸排汽调节汽门、第二低压缸冷却蒸汽管路等；第一中压缸排汽门的出口和第二中压缸排汽门的出口之间通过中压缸排汽联络管连接，且中压缸排汽联络管上安装有中压缸排汽联络管调节汽门；该方法实现了两个单元制机组之间的灵活切换。本发明无需对锅炉侧进行技术改造，充分利用了高中压缸和低压缸做功能力差异特性，操作灵活，功能实用，同时具有一定的抵抗事故能力。
The present invention discloses a thermal system and a switching method for ultra-low load operation of two machines with one furnace, the system comprising two unit-type units; the first unit-type unit comprises a first intermediate pressure cylinder exhaust valve, a first temperature reduction and pressure reducing valve, a first intermediate pressure cylinder exhaust regulating valve, a first cylinder cooling steam pipeline, etc., and the second unit-type unit comprises a second intermediate pressure cylinder exhaust valve, a second temperature reduction and pressure reducing valve, a second intermediate pressure cylinder exhaust regulating valve, a second low pressure cylinder cooling steam pipeline, etc.; the outlet of the first intermediate pressure cylinder exhaust valve and the outlet of the second intermediate pressure cylinder exhaust valve are connected by an intermediate pressure cylinder exhaust connecting pipe, and an intermediate pressure cylinder exhaust connecting pipe regulating valve is installed on the intermediate pressure cylinder exhaust connecting pipe; the method realizes flexible switching between the two unit-type units. The present invention does not require technical transformation of the boiler side, makes full use of the difference in the working capacity of the high and medium pressure cylinders and the low pressure cylinders, is flexible in operation, practical in function, and has a certain ability to resist accidents.
Description
Technical Field
The invention belongs to the technical field of power generation of energy power steam turbines, and particularly relates to a thermodynamic system with one furnace and two turbines running under ultra-low load and a switching method thereof.
Background
In the power dispatching system, the new energy power enjoys priority dispatching, but the new energy power has the characteristics of large fluctuation and instability. In order to absorb more zero-carbon emission power, the thermal power generating set must have excellent deep peak shaving capability, and the power peak shaving assists in the export of the market policy, and more thermal power generating sets are encouraged to participate in the power generating set.
The minimum stable combustion output limit of the coal-fired boiler without adding auxiliary fuel is limited, the minimum electric load of the existing thermal power unit is generally limited to about 30% -40%, and the continuous reduction can have adverse effect on the safe and continuous operation of the boiler. For the unit-system thermal generator set, under the working conditions of small volume flow such as start-up and stop of a steam turbine, the ultralow-load operation can be realized as long as the problems of flutter, air blowing and heating of the last-stage blade of the low-pressure cylinder are solved. The Chinese patent publication CN108661726A discloses a low-pressure cylinder cooling system with zero output of a low-pressure cylinder, and the low-pressure cylinder cooling system can realize zero output of the low-pressure cylinder by feeding low-flow low-pressure steam into the low-pressure cylinder, thereby greatly reducing the power generation capacity of a unit and improving the heat supply capacity of the unit. At present, the zero-output heat supply modification of the low-pressure cylinder has more successful cases in China, and is a powerful solution for the flexibility modification of the thermal power generating unit. The Chinese patent publication CN109653810A discloses a thermodynamic system with two switching operation machines, and the thermodynamic system is additionally provided with a superheated steam bypass, a reheat steam bypass and a control valve, so that when one boiler fails, the two turbines can be driven by the one boiler to generate electricity, but the system is complex in arrangement, and the deep peak regulation capacity of a unit needs to be further excavated.
As is known, when the unit is used for generating electricity, the working capacities of the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are obviously different, if the characteristics can be fully utilized, the influence of the minimum output limit of the boiler on the minimum output of the steam turbine can be broken through, the deep peak regulation operation of one boiler with two units is realized, the deep peak regulation electricity price income of a power plant can be further increased, the idle rate of the unit is reduced, and the flexibility of the unit for adapting to dispatching electric load instructions is enhanced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a thermodynamic system with two machines and ultra-low load operation and a switching method thereof, which do not need to technically modify the side of a boiler, fully utilize the difference characteristic of the working capacities of a high pressure cylinder and a medium pressure cylinder, have flexible operation and practical functions, and have certain accident resistance capacity.
The invention is realized by the following technical scheme:
a thermodynamic system with two units for ultra-low load operation in one furnace comprises a first unit system unit and a second unit system unit;
The first unit system group comprises a first medium pressure cylinder exhaust valve, a first temperature and pressure reducing valve, a first medium pressure cylinder exhaust gas regulating valve, a first cylinder cooling steam pipeline, a first low pressure cylinder, a first high pressure cylinder and a first medium pressure cylinder;
the second unit system group comprises a second medium pressure cylinder exhaust valve, a second temperature and pressure reducing valve, a second medium pressure cylinder exhaust gas regulating valve, a second cylinder cooling steam pipeline, a second low pressure cylinder, a second high pressure cylinder and a second medium pressure cylinder;
the outlet of the first medium pressure cylinder exhaust valve is connected with the outlet of the second medium pressure cylinder exhaust valve through a medium pressure cylinder exhaust gas connecting pipe, and the medium pressure cylinder exhaust gas connecting pipe is provided with a medium pressure cylinder exhaust gas connecting pipe for adjusting the valve;
A first cylinder cooling steam pipeline is led out from a middle pressure cylinder exhaust connecting pipe at the outlet of the first middle pressure cylinder exhaust valve in a branch way and is respectively connected with the first low pressure cylinder, the first high pressure cylinder and the steam inlet of the first middle pressure cylinder, a second cylinder cooling steam pipeline is led out from a middle pressure cylinder exhaust connecting pipe at the outlet of the second middle pressure cylinder exhaust valve in a branch way and is respectively connected with the steam inlets of the second low pressure cylinder, the second high pressure cylinder and the second middle pressure cylinder, and a first temperature and pressure reducing valve and a second temperature and pressure reducing valve are respectively arranged on the first cylinder cooling steam pipeline and the second cylinder cooling steam pipeline;
A first medium pressure cylinder steam exhaust regulating valve is arranged between the outlet of the first medium pressure cylinder steam exhaust valve and the steam inlet of the first low pressure cylinder, and a second medium pressure cylinder steam exhaust regulating valve is also arranged between the outlet of the second medium pressure cylinder steam exhaust valve and the steam inlet of the second low pressure cylinder;
a water supply communication pipe is connected between the water side outlets of the No. 7 low-pressure heaters of the two steam turbines, and a water supply flow regulating door is arranged on the water supply communication pipe;
A drainage connecting pipe is connected between the drainage inlets of the No. 7 low-pressure heaters of the two steam turbines, and a drainage flow regulating door is arranged on the drainage connecting pipe.
The invention is further improved in that the first unit system unit and the second unit system unit have the same power generation capacity, equal capacity, and consistent equipment type and thermodynamic system design.
The invention is further improved in that the operation states of the first unit system unit and the second unit system unit are that one boiler is operated, the other boiler is stopped for standby, or both turbines are simultaneously in a power generation operation state.
The invention is further improved in that the exhaust steam of the first medium pressure cylinder of the first unit system enters the second low pressure cylinder of the second unit system through the exhaust steam connecting pipe of the medium pressure cylinder.
The invention is further improved in that the steam extraction drainage of the first high pressure cylinder and the first medium pressure cylinder of the first unit system unit enters the steam extraction drainage system of the second low pressure cylinder of the second unit system unit through the drainage connecting pipe.
The invention is further improved in that the steam extraction heating water corresponding to the second low pressure cylinder of the second unit system enters the water supply heat recovery system of the first high pressure cylinder and the first medium pressure cylinder of the first unit system through the water supply connecting pipe.
The invention is further improved in that the first cylinder cooling steam pipeline is connected with the medium pressure cylinder exhaust steam connecting pipe in a bypass branch pipe mode, and steam in the first cylinder cooling steam pipeline enters the first high pressure cylinder and the first medium pressure cylinder through the first temperature and pressure reducing valve.
The invention is further improved in that the second cylinder cooling steam pipeline is connected with the medium pressure cylinder exhaust steam connecting pipe in the form of a bypass branch pipe, and steam therein enters the second low pressure cylinder through the second temperature and pressure reducing valve.
The switching method for the ultra-low load operation of one furnace with two machines is based on the thermodynamic system for the ultra-low load operation of one furnace with two machines, and is illustrated as follows by taking the normal operation of a first unit system unit and the shutdown standby of a second unit system unit as an example:
Step 1, a first medium pressure cylinder exhaust valve and a first temperature and pressure reducing valve of a first unit system are operated to be in an open state, a second medium pressure cylinder exhaust valve and a second temperature and pressure reducing valve of a standby second unit system are in a closed state, and a medium pressure cylinder exhaust connecting pipe adjusting valve, a water supply flow adjusting valve, a drainage flow adjusting valve, a first temperature and pressure reducing valve and a second temperature and pressure reducing valve are all in a closed state;
Step 2, a full-open medium pressure cylinder exhaust connecting pipe is used for adjusting a valve, and a second medium pressure cylinder exhaust adjusting valve is used for slowly closing the first medium pressure cylinder exhaust adjusting valve and opening a first temperature and pressure reducing valve so that cooling steam enters a first low pressure cylinder through a first cylinder cooling steam pipeline;
And 3, starting a condenser and a condensate pump system of the second unit system, gradually stopping the condenser and the condensate pump system of the first unit system, fully opening a water flow regulating door and a drainage flow regulating door, and starting a second temperature and pressure reducing valve to enable cooling steam to enter a second high-pressure cylinder and a second medium-pressure cylinder through a second cylinder cooling steam pipeline.
The invention is further improved in that the first unit machine set boiler is in an operation state, the second unit machine set boiler is in a hot standby state, both units are in a grid-connected power generation state, and the two units share the electric load instruction of the first unit machine set;
The method is switched from a one-furnace one-machine operation mode to a one-furnace two-machine operation mode.
Compared with the prior art, the invention has at least the following beneficial technical effects:
The invention provides a thermodynamic system with two-machine ultra-low load operation and a switching method thereof, which realize the safe switching between one-machine operation and two-machine operation modes by additionally arranging a medium pressure cylinder steam exhaust connecting pipe, a water supply connecting pipe, a drainage connecting pipe and a cylinder cooling steam pipeline. The one-furnace-belt two-machine mode deep peak regulation operation can reduce the idle rate of the unit, enhance the flexibility of the unit for adapting to the dispatching electric load instruction, increase the deep peak regulation electricity price income of the power plant and improve the production operation benefit of the power plant.
Drawings
FIG. 1 is a schematic illustration of a thermodynamic system for a two-machine ultra low load operation in accordance with an embodiment of the present invention.
Reference numerals illustrate:
1. The device comprises a first medium pressure cylinder exhaust valve, a first temperature and pressure reducing valve, a3 medium pressure cylinder exhaust connecting pipe, a 4 first medium pressure cylinder exhaust adjusting valve, a 5 first medium pressure cylinder cooling steam pipeline, a 6 medium pressure cylinder exhaust connecting pipe adjusting valve, a 7 second medium pressure cylinder exhaust valve, a 8 second temperature and pressure reducing valve, a 9 second medium pressure cylinder exhaust adjusting valve, a 10 second cylinder cooling steam pipeline, a 11, a drainage connecting pipe, a 12, a drainage flow adjusting valve, a 13, a water supply flow adjusting valve, a 14, a water supply connecting pipe, a 15 first low pressure cylinder, a 16 second low pressure cylinder, a 17, a first medium pressure cylinder, a 18, a second medium pressure cylinder, a 19, a first high pressure cylinder, a 20, a second medium pressure cylinder, a 21, a first unit manufacturing unit and a 22, and a second unit manufacturing unit.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention provides a thermodynamic system with two machines and ultra-low load operation, which comprises two unit system units with equal capacity, equal equipment types and thermodynamic systems. The first unit system 21 includes a first intermediate pressure cylinder exhaust valve 1, a first temperature and pressure reducing valve 2, a first intermediate pressure cylinder exhaust valve 4, a first cylinder cooling steam line 5, a first low pressure cylinder 15, a first intermediate pressure cylinder 17, and a first high pressure cylinder 19, and the second unit system 22 includes a second intermediate pressure cylinder exhaust valve 7, a second temperature and pressure reducing valve 8, a second intermediate pressure cylinder exhaust valve 9, a second cylinder cooling steam line 10, a second low pressure cylinder 16, a second intermediate pressure cylinder 18, and a second high pressure cylinder 20; the outlet of the first medium pressure cylinder exhaust valve 1 is connected with the outlet of the second medium pressure cylinder exhaust valve 7 through a medium pressure cylinder exhaust connecting pipe 3, and the medium pressure cylinder exhaust connecting pipe 3 is provided with a medium pressure cylinder exhaust connecting pipe adjusting valve 6; the first middle pressure cylinder exhaust steam pipeline 5 is led out from the middle pressure cylinder exhaust steam connecting pipe 3 at the outlet of the first middle pressure cylinder exhaust steam valve 1 in the form of a branch and is respectively connected with the first low pressure cylinder 15, the first high pressure cylinder 19 and the inlet of the first middle pressure cylinder 17, the second middle pressure cylinder exhaust steam pipeline 10 is led out from the middle pressure cylinder exhaust steam connecting pipe 3 at the outlet of the second middle pressure cylinder exhaust steam valve 7 in the form of a branch and is respectively connected with the second low pressure cylinder 16, the second high pressure cylinder 20 and the inlet of the second middle pressure cylinder 18, the first temperature and pressure reducing valve 2 and the second temperature and pressure reducing valve 8 are respectively arranged on the first cylinder cooling steam pipeline 5 and the second cylinder cooling steam pipeline 10, the first middle pressure cylinder exhaust steam valve 1 outlet and the inlet of the first low pressure cylinder 15 are also provided with the first middle pressure cylinder exhaust steam valve 4, the second middle pressure exhaust steam valve 7 outlet and the inlet of the second low pressure cylinder 16 are also provided with the second middle pressure exhaust steam valve 9, the water supply steam turbine 14 is connected with the two heating steam turbine side of the low pressure regulator 14, a water supply flow regulating door 13 is arranged on the water supply connecting pipe 14, a water drain connecting pipe 11 is connected between the water drain inlets of the No. 7 low-pressure heaters of the two steam turbines, and a water drain flow regulating door 12 is arranged on the water drain connecting pipe 11.
Preferably, a middle pressure cylinder exhaust gas connecting pipe adjusting valve 6 is arranged on the middle pressure cylinder exhaust gas connecting pipe 3, so that the switching of the power generation operation mode of a single turbine and the power generation operation modes of two turbines under the low-load operation state is realized.
Preferably, the exhaust steam from the middle pressure cylinder to the low pressure cylinder of the two steam turbines is controlled through a first middle pressure cylinder exhaust valve 1 and a second middle pressure cylinder exhaust valve 7, and the valves can realize cutting and operation of the low pressure cylinder, namely, the low pressure cylinder is isolated from the high pressure cylinder and the middle pressure cylinder;
Preferably, a first temperature-reducing and pressure-reducing valve 2 and a second temperature-reducing and pressure-reducing valve 8 are arranged on a first cylinder cooling steam pipeline 5 and a second cylinder cooling steam pipeline 10, the pipeline steam source is medium-pressure cylinder steam exhaust, the pipeline steam source is connected with a medium-pressure cylinder steam exhaust connecting pipe 3 in a bypass branch pipe mode, and a small amount of temperature reduction and pressure reduction is sent into a cut cylinder to avoid the phenomena of flutter, blowing and heating of a final stage blade of the cylinder;
preferably, the medium pressure cylinder exhaust gas connecting pipe 3 of the two steam turbines is provided with a medium pressure cylinder exhaust gas connecting pipe adjusting valve 6 for adjusting the inlet gas flow of the first low pressure cylinder 15 and the second low pressure cylinder 16 in the switching process;
preferably, a water supply flow regulating door 13 is arranged on the water supply connecting pipe 14 and is used for regulating the water supply flow of the two units in the switching process;
preferably, the hydrophobic connecting pipe 11 is provided with a hydrophobic flow adjusting door 12 for adjusting the hydrophobic flow of the two units in the switching process.
The invention provides a switching method for ultra-low load operation of one furnace with two machines, which is based on the thermodynamic system and comprises the following steps of taking normal operation of a first unit system unit 21 and shutdown standby of a second unit system unit 22 as an example for explanation:
Step 1, a first medium pressure cylinder exhaust valve 4 and a first temperature and pressure reducing valve 2 of a first unit system unit 21 are operated to be in an open state, a second medium pressure cylinder exhaust valve 7, a second medium pressure cylinder exhaust valve 9 and a second temperature and pressure reducing valve 8 of a standby second unit system unit 22 are in a closed state, and a medium pressure cylinder exhaust connecting pipe regulating valve 6, a water supply flow regulating valve 13, a drainage flow regulating valve 12, the first temperature and pressure reducing valve 2 and the second temperature and pressure reducing valve 8 are all in a closed state;
Step 2, a full-open medium pressure cylinder exhaust connecting pipe adjusting valve 6 and a second medium pressure cylinder exhaust adjusting valve 9 are adopted, wherein the first medium pressure cylinder exhaust adjusting valve 4 is slowly closed, and the first temperature and pressure reducing valve 2 is opened to enable cooling steam to enter the first low pressure cylinder 15 through the first cylinder cooling steam pipeline 5;
step 3, the condenser and condensate pump system of the second unit system unit 22 is started, the condenser and condensate pump system of the first unit system unit 21 is gradually shut down, the water supply flow regulating door 13 and the drain flow regulating door 12 are fully opened, the second temperature and pressure reducing valve 8 is opened, and cooling steam enters the second high-pressure cylinder 20 and the second medium-pressure cylinder 18 through the second cylinder cooling steam pipeline 10.
And 4, slowly adjusting the operation parameters to finish the operation mode switching between one machine and two machines. The high-medium pressure cylinder of the running unit and the low-pressure cylinder of the standby unit jointly bear the dispatching electric load instruction.
The foregoing description is only illustrative of the present invention, and the present invention is not limited to the embodiments described above, but is capable of being modified or substituted by various embodiments described below, which will be apparent to those skilled in the art. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A thermodynamic system with one furnace and two machines running under ultra-low load, which is characterized by comprising a first unit system unit (21) and a second unit system unit (22);
the first unit system unit (21) comprises a first medium pressure cylinder exhaust valve (1), a first temperature and pressure reducing valve (2), a first medium pressure cylinder exhaust regulating valve (4), a first cylinder cooling steam pipeline (5), a first low pressure cylinder (15), a first high pressure cylinder (19) and a first medium pressure cylinder (17);
The second unit system group (22) comprises a second medium pressure cylinder exhaust valve (7), a second temperature and pressure reducing valve (8), a second medium pressure cylinder exhaust gas regulating valve (9), a second cylinder cooling steam pipeline (10), a second low pressure cylinder (16), a second high pressure cylinder (20) and a second medium pressure cylinder (18);
The outlet of the first medium pressure cylinder exhaust valve (1) is connected with the outlet of the second medium pressure cylinder exhaust valve (7) through a medium pressure cylinder exhaust connecting pipe (3), and the medium pressure cylinder exhaust connecting pipe (3) is provided with a medium pressure cylinder exhaust connecting pipe adjusting valve (6);
A first cylinder cooling steam pipeline (5) is led out from a middle pressure cylinder exhaust connecting pipe (3) at the outlet of a first middle pressure cylinder exhaust valve (1) in a branch way and is respectively connected with steam inlets of a first low pressure cylinder (15), a first high pressure cylinder (19) and a first middle pressure cylinder (17), a second cylinder cooling steam pipeline (10) is led out from the middle pressure cylinder exhaust connecting pipe (3) at the outlet of a second middle pressure cylinder exhaust valve (7) in a branch way and is respectively connected with steam inlets of a second low pressure cylinder (16), a second high pressure cylinder (20) and a second middle pressure cylinder (18), and a first temperature and pressure reducing valve (2) and a second temperature and pressure reducing valve (8) are respectively arranged on the first cylinder cooling steam pipeline (5) and the second cylinder cooling steam pipeline (10);
A first medium pressure cylinder steam exhaust regulating valve (4) is arranged between the outlet of the first medium pressure cylinder steam exhaust valve (1) and the steam inlet of the first low pressure cylinder (15), and a second medium pressure cylinder steam exhaust regulating valve (9) is arranged between the outlet of the second medium pressure cylinder steam exhaust valve (7) and the steam inlet of the second low pressure cylinder (16);
A water supply connecting pipe (14) is connected between the water side outlets of the No. 7 low-pressure heaters of the two steam turbines, and a water supply flow regulating door (13) is arranged on the water supply connecting pipe (14);
A drainage connecting pipe (11) is connected between the drainage inlets of the No. 7 low-pressure heaters of the two steam turbines, and a drainage flow regulating door (12) is arranged on the drainage connecting pipe (11).
2. A thermodynamic system with ultra-low load operation of two machines in a furnace according to claim 1, characterized in that the power generating capacity of the first unit system (21) and the second unit system (22) are the same, the capacities are equal, and the equipment type and thermodynamic system design are consistent.
3. A thermodynamic system with ultra-low load operation of two turbines according to claim 1, characterized in that the operation state of the first unit system (21) and the second unit system (22) is one boiler operation, the other boiler is shut down for standby, or both turbines are simultaneously in power generating operation.
4. A thermodynamic system with ultra low load operation of two machines, according to claim 1, characterized in that the exhaust gas of the first medium pressure cylinder (17) of the first unit-making group (21) enters the second low pressure cylinder (16) of the second unit-making group (22) through the medium pressure cylinder exhaust gas connecting pipe (3).
5. A thermodynamic system with ultra-low load operation of two machines in a furnace according to claim 1, characterized in that the steam extraction and drainage of the first high pressure cylinder (19) of the first unit system (21) and the steam extraction and drainage of the first medium pressure cylinder (17) enter the steam extraction and drainage system of the second low pressure cylinder (16) of the second unit system (22) through the drainage connecting pipe (11).
6. A thermodynamic system with ultra-low load operation of two machines according to claim 1, characterized in that the steam extraction heating feed water corresponding to the second low pressure cylinder (16) of the second unit system (22) enters the feed water regenerative system of the first high pressure cylinder (19) and the first medium pressure cylinder (17) of the first unit system (21) through the feed water connecting pipe (14).
7. A thermodynamic system with two-machine ultra-low load operation according to claim 1, characterized in that the first cylinder cooling steam line (5) is connected to the intermediate pressure cylinder exhaust gas connection line (3) in the form of a bypass branch, wherein the steam enters the first high pressure cylinder (19) and the first intermediate pressure cylinder (17) via the first temperature and pressure reducing valve (2).
8. A thermodynamic system with ultra low load operation of two machines according to claim 1, characterized in that the second cylinder cooling steam line (10) is connected to the intermediate pressure cylinder exhaust gas connection (3) in the form of a bypass branch, wherein the steam is fed into the second low pressure cylinder (16) via the second temperature and pressure reducing valve (8).
9. A method for switching operation of one furnace with two machines under ultra-low load, characterized in that the method is based on a thermodynamic system of one furnace with two machines under ultra-low load according to any one of claims 1 to 8, and the method is described as follows by taking the normal operation of a first unit system (21) and the shutdown standby of a second unit system (22) as an example:
Step 1, a first medium pressure cylinder exhaust valve (1), a first medium pressure cylinder exhaust regulating valve (4) and a first temperature and pressure reducing valve (2) of a first unit system unit (21) are operated to be in an open state, a second medium pressure cylinder exhaust valve (7), a second medium pressure cylinder exhaust regulating valve (9) and a second temperature and pressure reducing valve (8) of a standby second unit system unit (22) are in a closed state, and a medium pressure cylinder exhaust connecting pipe regulating valve (6), a water supply flow regulating valve (13), a drainage flow regulating valve (12), the first temperature and pressure reducing valve (2) and the second temperature and pressure reducing valve (8) are all in a closed state;
Step 2, a full-open medium pressure cylinder exhaust gas connecting pipe adjusting valve (6), a second medium pressure cylinder exhaust gas adjusting valve (9), a first medium pressure cylinder exhaust gas adjusting valve (4) is slowly closed, a first temperature and pressure reducing valve (2) is opened, and cooling steam enters a first low pressure cylinder (15) through a first cylinder cooling steam pipeline (5);
step 3, a condenser and condensate pump system of the second unit system unit (22) is started, the condenser and condensate pump system of the first unit system unit (21) is gradually shut down, a water supply flow regulating door (13) and a drain flow regulating door (12) are fully opened, a second temperature and pressure reducing valve (8) is opened, and cooling steam enters a second high-pressure cylinder (20) and a second medium-pressure cylinder (18) through a second cylinder cooling steam pipeline (10).
10. The switching method of ultra-low load operation of one furnace with two machines according to claim 9, wherein the boiler of the first unit system unit (21) is in an operation state, the boiler of the second unit system unit (22) is in a hot standby state, the two units are in a grid-connected power generation state, and the two units share an electric load instruction of the first unit system unit (21);
The method is switched from a one-furnace one-machine operation mode to a one-furnace two-machine operation mode.
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| CN202110296622.3A CN112879110B (en) | 2021-03-19 | 2021-03-19 | A thermal system with one furnace and two machines operating at ultra-low load and a switching method thereof |
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| CN113431648B (en) * | 2021-06-29 | 2023-03-14 | 西安热工研究院有限公司 | Reheater structure of header reheating system |
| CN113294219B (en) * | 2021-07-05 | 2025-05-13 | 西安热工研究院有限公司 | A high-parameter combined cycle super-generation wet cooling unit and its operation method |
| CN114251139B (en) * | 2021-12-08 | 2023-09-12 | 西安热工研究院有限公司 | Unit thermal power generation unit neighbor quick start system |
| CN116696494B (en) * | 2023-06-13 | 2025-09-12 | 东方电气集团东方汽轮机有限公司 | A system and control method for cutting off a single low-pressure cylinder of a double low-pressure cylinder middle-row heating unit |
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| CA2680571A1 (en) * | 2009-09-16 | 2011-03-16 | Fikret M. Zabtcioglu | Hybrid integrated cogeneration system and method |
| JP5999919B2 (en) * | 2012-02-17 | 2016-09-28 | 三菱日立パワーシステムズ株式会社 | Single-chamber steam turbine and single-shaft combined cycle power generator |
| CN203374322U (en) * | 2013-05-24 | 2014-01-01 | 华电国际电力股份有限公司山东分公司 | Low-pressure separating board for steam turbine double-rotor exchanging circulating water heat supply |
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2021
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| CN214660379U (en) * | 2021-03-19 | 2021-11-09 | 西安热工研究院有限公司 | A thermal system with one furnace and two machines operating at ultra-low load |
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