CN112879110A - Thermodynamic system with one furnace and two machines operating at ultralow load and switching method thereof - Google Patents
Thermodynamic system with one furnace and two machines operating at ultralow load and 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
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- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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Abstract
The invention discloses a thermodynamic system with two machines operating in ultralow load for one furnace and a switching method thereof, wherein the system comprises two unit-making machines; the first unit system unit comprises a first intermediate pressure cylinder steam exhaust valve, a first temperature and pressure reducing valve, a first intermediate pressure cylinder steam exhaust adjusting valve, a first cylinder cooling steam pipeline and the like, and the second unit system unit comprises a second intermediate pressure cylinder steam exhaust valve, a second temperature and pressure reducing valve, a second intermediate pressure cylinder steam exhaust adjusting valve, a second low pressure cylinder cooling steam pipeline and the like; the outlet of the first intermediate pressure cylinder exhaust valve is connected with the outlet of the second intermediate pressure cylinder exhaust valve through an intermediate pressure cylinder exhaust connecting pipe, and an intermediate pressure cylinder exhaust connecting pipe adjusting valve is installed on the intermediate pressure cylinder exhaust connecting pipe; the method realizes flexible switching between the two unit-making units. The invention does not need to technically modify the boiler side, fully utilizes the difference characteristic of the work-doing capacities of the high-medium pressure cylinder and the low-pressure cylinder, has flexible operation and practical function, and simultaneously has certain accident resistance.
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 two turbines in one furnace and running at ultra-low load and a switching method thereof.
Background
In the power dispatching system, the new energy power enjoys priority dispatching right, but the new energy power often has the characteristics of large fluctuation and instability. In order to absorb more zero-carbon emission power, the thermal power generating unit must have excellent deep peak shaving capacity, and the electric peak shaving auxiliary service market policy is issued, so that more thermal power generating units are encouraged to participate.
The minimum electric load of the existing thermal power generating unit is generally limited to about 30-40% due to the limitation of the minimum stable combustion output of the auxiliary fuel which is not put into the coal-fired boiler, and the safe and continuous operation of the boiler is adversely affected if the minimum electric load is continuously reduced. For a unit system thermal power generating set, the ultra-low load operation can be realized only by stably solving the problems of flutter, blast and heating of the last stage blade of the low-pressure cylinder under the working conditions of small volume flow such as starting and stopping of a steam turbine. Chinese patent publication CN108661726A discloses a low pressure cylinder cooling system with zero output of low pressure cylinder, which can realize zero output of low pressure cylinder by feeding low flow low pressure steam into the low pressure cylinder, greatly reduce the generating capacity of the unit, and improve the heating capacity of the unit. At present, low-pressure cylinder zero-output heat supply transformation has more successful cases in China, and is a powerful solution for flexibility transformation of thermal power units. The Chinese patent publication No. CN109653810A discloses a thermodynamic system with two machines switched to operate in one furnace, and by additionally arranging a superheated steam and reheated steam bypass and a control valve, the problem that one boiler can be used for driving two steam turbines to generate power when one boiler fails is solved, but the system is complex in arrangement and the deep peak shaving capacity of a unit needs to be further excavated.
As is known, when the unit set generates power, the working capacities of the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are obviously different, if the characteristic can be fully utilized, the influence of the minimum output limit of the boiler on the minimum output of the power generation of the steam turbine can be broken through, the deep peak-shaving operation of one boiler with two machines is realized, the deep peak-shaving electricity price income of a power plant can be further increased, the idle rate of the unit set is reduced, and the flexibility of the unit set for adapting to the dispatching electric load instruction is enhanced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a thermodynamic system with two machines operating at ultralow load in one furnace and a switching method thereof, which do not need to carry out technical transformation on the side of the boiler, fully utilize the difference characteristic of the work capacity of a high-medium pressure cylinder and a low-pressure cylinder, have flexible operation and practical function and simultaneously have certain accident resistance.
The invention is realized by the following technical scheme:
a thermal system with two machines operating in ultra-low load of a furnace comprises a first unit system machine set and a second unit system machine set;
the first unit system unit comprises a first intermediate pressure cylinder exhaust steam valve, a first temperature and pressure reducing valve, a first intermediate pressure cylinder exhaust steam adjusting steam valve, a first cylinder cooling steam pipeline, a first low pressure cylinder, a first high pressure cylinder and a first intermediate pressure cylinder;
the second unit system unit comprises a second intermediate pressure cylinder exhaust steam valve, a second temperature and pressure reducing valve, a second intermediate pressure cylinder exhaust steam adjusting steam valve, a second cylinder cooling steam pipeline, a second low pressure cylinder, a second high pressure cylinder and a second intermediate pressure cylinder;
the outlet of the first intermediate pressure cylinder exhaust valve is connected with the outlet of the second intermediate pressure cylinder exhaust valve through an intermediate pressure cylinder exhaust connecting pipe, and an intermediate pressure cylinder exhaust connecting pipe adjusting valve is installed on the intermediate pressure cylinder exhaust connecting pipe;
a first steam cylinder cooling steam pipeline is led out in a branch way from a steam exhaust connecting pipe of a medium pressure cylinder at a steam exhaust valve outlet of a first medium pressure cylinder and is respectively connected with steam inlets of a first low pressure cylinder, a first high pressure cylinder and the first medium pressure cylinder, a second steam cylinder cooling steam pipeline is led out in a branch way from a steam exhaust connecting pipe of a medium pressure cylinder at a steam exhaust valve outlet of a second medium pressure cylinder and is respectively connected with steam inlets of a second low pressure cylinder, a second high pressure cylinder and the second medium pressure cylinder, and a first temperature and pressure reducing valve and a second temperature and pressure reducing valve are respectively installed on the cooling steam pipeline of the first low pressure cylinder and the cooling steam pipeline of the second cylinder;
a first intermediate pressure cylinder steam exhaust adjusting steam valve is also arranged between the outlet of the first intermediate pressure cylinder steam exhaust valve and the steam inlet of the first low pressure cylinder, and a second intermediate pressure cylinder steam exhaust adjusting steam valve is also arranged between the outlet of the second intermediate pressure cylinder steam exhaust valve and the steam inlet of the second low pressure cylinder;
a water supply connecting pipe is connected between water side outlets of No. 7 low-pressure heaters of the two turbines, and a water supply flow regulating valve is installed on the water supply connecting pipe;
a drain connecting pipe is connected between drain inlets of No. 7 low-pressure heaters of the two turbines, and a drain flow regulating valve is installed on the drain connecting pipe.
The invention has the further improvement that the first unit system unit and the second unit system unit have the same power generation capacity and capacity, and the equipment type and the thermodynamic system are designed in a consistent way.
The invention is further improved in that the operating state of the first unit system unit and the second unit system unit is that one boiler is operated, the other boiler is stopped for standby, or the two turbines are in the power generation operating state at the same time.
The invention is further improved in that the exhaust steam of the first intermediate pressure cylinder of the first unit system unit enters the second low pressure cylinder of the second unit system unit through the exhaust steam communication pipe of the intermediate pressure cylinder.
The invention is further improved in that the steam extraction drainage of the first high-pressure cylinder and the first intermediate-pressure cylinder of the first unit system unit enters a steam extraction drainage system of a second low-pressure cylinder of the second unit system unit through a drainage communication pipe.
The invention has the further improvement that the steam extraction heating feedwater corresponding to the second low-pressure cylinder of the second unit system unit enters the feedwater heat recovery system of the first high-pressure cylinder and the first intermediate-pressure cylinder of the first unit system unit through the feedwater connecting pipe.
The invention is further improved in that the first cylinder cooling steam pipeline is connected with the intermediate pressure cylinder exhaust 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 intermediate 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 intermediate pressure cylinder exhaust connecting pipe in a bypass branch pipe mode, and steam in the second cylinder cooling steam pipeline enters the second low pressure cylinder through a second temperature and pressure reducing valve.
The method for switching the one-furnace-two-machine ultralow-load operation is based on the thermodynamic system with the one-furnace-two-machine ultralow-load operation, and is described by taking the first unit system for normal operation and the second unit system for shutdown and standby as an example as follows:
step 1, operating a first intermediate pressure cylinder steam exhaust valve, a first intermediate pressure cylinder steam exhaust adjusting valve and a first temperature and pressure reducing valve of a first unit system unit to be in an opening state; a second intermediate pressure cylinder steam exhaust valve, a second intermediate pressure cylinder steam exhaust adjusting valve and a second temperature and pressure reducing valve of the standby second unit system unit are in a closed state; the intermediate pressure cylinder exhaust connecting pipe adjusting steam valve, the water supply flow adjusting valve, the drainage flow adjusting valve, the first temperature and pressure reducing valve and the second temperature and pressure reducing valve are all in a closed state;
step 2, fully opening a steam exhaust connecting pipe of the intermediate pressure cylinder to adjust a steam valve, and opening a steam exhaust adjusting steam valve of a second intermediate pressure cylinder; slowly closing a steam exhaust adjusting valve of the first intermediate pressure cylinder and opening a first temperature and pressure reducing valve to enable cooling steam to enter the first low pressure cylinder through a first cylinder cooling steam pipeline;
step 3, starting a condenser and a condensate pump system of the second unit system unit, and gradually stopping the condenser and the condensate pump system of the first unit system unit; a fully opened water supply flow regulating valve and a drain flow regulating valve; and opening a second temperature and pressure reducing valve to enable the cooling steam to enter a second high-pressure cylinder and a second intermediate-pressure cylinder through a second cylinder cooling steam pipeline.
The invention has the further improvement that the boiler of the first unit system unit is in an operating state, the boiler of the second unit system unit is in a hot standby state, the two units are both in a grid-connected power generation state, and the two units share the electric load instruction of the first unit system unit;
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 machines operating in ultra-low load for one furnace and a switching method thereof.A safe switching between one-furnace one-machine operation mode and one-furnace two-machine operation mode is realized by additionally arranging a medium pressure cylinder exhaust connecting pipe, a water supply connecting pipe, a drainage connecting pipe and a cylinder cooling steam pipeline; in addition, the invention also fully utilizes the difference of the working characteristics of the high and medium pressure cylinders and the low pressure cylinder, the high and medium pressure cylinders of the running unit and the low pressure cylinder of the standby unit respectively do work, two sets of generators can respectively generate lower electric load, the dispatching electric load born by the original one-furnace one-unit is born by one furnace and two machines together, and lower technical output is realized. The deep peak shaving operation of the two-machine mode of the one furnace can reduce the idle rate of the unit, enhance the flexibility of the unit to adapt to the dispatching electric load instruction, increase the deep peak shaving electricity price income of the power plant and improve the production and operation benefits of the power plant.
Drawings
FIG. 1 is a schematic diagram of a thermodynamic system for operating a furnace with two machines at ultra-low loads according to an embodiment of the present invention.
Description of reference numerals:
1. a first intermediate pressure cylinder exhaust valve; 2. a first temperature and pressure reducing valve; 3. the intermediate pressure cylinder exhausts the union pipe; 4. a first intermediate pressure cylinder steam exhaust adjusting valve; 5. a first cylinder cooling steam line; 6. the intermediate pressure cylinder exhaust connecting pipe adjusts a valve; 7. a second intermediate pressure cylinder exhaust valve; 8. a second temperature and pressure reducing valve; 9. a second intermediate pressure cylinder steam exhaust adjusting valve; 10. a second cylinder cooling steam line; 11. a hydrophobic communication tube; 12. a drain flow regulating gate; 13. a feed water flow rate regulating valve; 14. a water supply communication pipe; 15. a first low pressure cylinder 16, a second low pressure cylinder; 17. a first intermediate pressure cylinder; 18. a second intermediate pressure cylinder; 19. a first high pressure cylinder; 20. a second pressure cylinder; 21. a first unit making unit; 22. and a second unit making machine set.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a thermodynamic system with two furnaces and two machines operating in ultra-low load, which comprises two unit-making units with the same capacity, the same equipment type and the thermodynamic system. The first unit system unit 21 comprises a first intermediate pressure cylinder exhaust steam valve 1, a first temperature and pressure reducing valve 2, a first intermediate pressure cylinder exhaust steam adjusting steam valve 4, a first intermediate pressure cylinder cooling steam pipeline 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 unit 22 comprises a second intermediate pressure cylinder exhaust steam valve 7, a second temperature and pressure reducing valve 8, a second intermediate pressure cylinder exhaust steam adjusting steam valve 9, a second intermediate pressure cylinder cooling steam pipeline 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 intermediate pressure cylinder exhaust valve 1 is connected with the outlet of the second intermediate pressure cylinder exhaust valve 7 through an intermediate pressure cylinder exhaust connecting pipe 3, and an intermediate pressure cylinder exhaust connecting pipe adjusting valve 6 is installed on the intermediate pressure cylinder exhaust connecting pipe 3; a first steam cylinder cooling steam pipeline 5 is led out in a branch way from a steam exhaust connecting pipe 3 of a medium pressure cylinder at the outlet of a first medium pressure cylinder steam exhaust valve 1 and is respectively connected with steam inlets of a first low pressure cylinder 15, a first high pressure cylinder 19 and a first medium pressure cylinder 17, a second steam cylinder cooling steam pipeline 10 is led out in a branch way from a steam exhaust connecting pipe 3 of a medium pressure cylinder at the outlet of a second medium pressure cylinder steam exhaust valve 7 and is respectively connected with steam inlets of a second low pressure cylinder 16, a second high pressure cylinder 20 and a second medium pressure cylinder 18, and a first temperature and pressure reducing valve 2 and a second temperature and pressure reducing valve 8 are respectively installed on the first steam cylinder cooling steam pipeline 5 and the second steam cylinder cooling steam pipeline 10; a first intermediate pressure cylinder steam exhaust adjusting steam valve 4 is also arranged between the outlet of the first intermediate pressure cylinder steam exhaust steam valve 1 and the steam inlet of the first low pressure cylinder 15, and a second intermediate pressure cylinder steam exhaust adjusting steam valve 9 is also arranged between the outlet of the second intermediate pressure cylinder steam exhaust steam valve 7 and the steam inlet of the second low pressure cylinder 16; a water supply connecting pipe 14 is connected between water side outlets of No. 7 low-pressure heaters of the two turbines, and a water supply flow regulating valve 13 is installed on the water supply connecting pipe 14; a drain connecting pipe 11 is connected between drain inlets of No. 7 low-pressure heaters of the two turbines, and a drain flow regulating valve 12 is installed on the drain connecting pipe 11.
Preferably, the intermediate pressure cylinder steam exhaust connecting pipe 3 is provided with an intermediate pressure cylinder steam exhaust connecting pipe adjusting valve 6, so that the switching between the power generation operation mode of a single turbine and the power generation operation mode of two turbines in a low-load operation state is realized.
Preferably, the steam exhaust from the intermediate pressure cylinder to the low pressure cylinder of the two turbines is controlled by a first intermediate pressure cylinder steam exhaust valve 1 and a second intermediate pressure cylinder steam exhaust valve 7, and the valves can realize the cutting and operation of the low pressure cylinder, namely, the low pressure cylinder is isolated from the high pressure cylinder and the intermediate pressure cylinder;
preferably, a first temperature-reducing pressure-reducing valve 2 and a second temperature-reducing pressure-reducing valve 8 are arranged on a first cylinder cooling steam pipeline 5 and a second cylinder cooling steam pipeline 10, a steam source of the pipelines is intermediate cylinder exhaust steam, the pipelines are connected with an intermediate cylinder exhaust steam connecting pipe 3 in a bypass branch pipe mode, and a small amount of the intermediate cylinder exhaust steam is sent into a cut cylinder through temperature-reducing pressure-reducing, so that the phenomena of fluttering, blowing and heating of a last-stage blade of the cylinder are avoided;
preferably, the intermediate pressure cylinder exhaust connecting pipe adjusting steam valve 6 is arranged on the intermediate pressure cylinder exhaust connecting pipe 3 of the two turbines and is used for adjusting the steam inlet flow of the first low pressure cylinder 15 and the second low pressure cylinder 16 in the switching process;
preferably, a feed water flow adjusting door 13 is installed on the feed water connecting pipe 14 and is used for adjusting the feed water flow of the two units in the switching process;
preferably, the drainage communication pipe 11 is provided with a drainage flow regulating door 12 for regulating the drainage flow of the two units in the switching process.
The invention provides a switching method for ultralow load operation of two units in one furnace, which is based on the thermodynamic system and comprises the following steps, taking the first unit system unit 21 to normally operate and the second unit system unit 22 to stop for standby as an example, the steps are as follows:
step 1, operating a first intermediate pressure cylinder steam exhaust valve 1, a first intermediate pressure cylinder steam exhaust adjusting valve 4 and a first temperature and pressure reducing valve 2 of a first unit system unit 21 to be in an open state; the second intermediate pressure cylinder steam exhaust valve 7, the second intermediate pressure cylinder steam exhaust adjusting valve 9 and the second temperature and pressure reducing valve 8 of the standby second unit system unit 22 are in a closed state; the intermediate pressure cylinder exhaust connecting pipe adjusting valve 6, the water supply flow adjusting valve 13, the drainage flow adjusting 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, fully opening a steam exhaust connecting pipe adjusting valve 6 of the intermediate pressure cylinder and a steam exhaust adjusting valve 9 of a second intermediate pressure cylinder; slowly closing the steam exhaust adjusting valve 4 of the first intermediate pressure cylinder and opening the first temperature and pressure reducing valve 2 to enable cooling steam to enter the first low pressure cylinder 17 through the first cylinder cooling steam pipeline 5;
step 3, starting a condenser and a condensate pump system of the second unit-making unit 22, and gradually stopping the condenser and the condensate pump system of the first unit-making unit 21; a fully opened feed water flow regulating valve 13 and a drain flow regulating valve 12; the second pressure and temperature reducing valve 8 is opened to allow the cooling steam to enter the second high pressure cylinder 20 and the second intermediate pressure cylinder 18 through the second cylinder cooling steam line 10.
And 4, slowly adjusting the operation parameters to complete the switching of the operation modes of one furnace and one machine and two machines. The high and medium pressure cylinders of the running unit and the low pressure cylinder of the standby unit share the command of dispatching the electric load.
The above description is only a preferred embodiment of the present invention, and the embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A thermodynamic system with two machines operating in ultra-low load of a furnace is characterized by comprising a first unit system machine set (21) and a second unit system machine set (22);
the first unit system unit (21) comprises a first intermediate pressure cylinder steam exhaust valve (1), a first temperature and pressure reducing valve (2), a first intermediate pressure cylinder steam exhaust adjusting valve (4), a first cylinder cooling steam pipeline (5), a first low pressure cylinder (15), a first high pressure cylinder (19) and a first intermediate pressure cylinder (17);
the second unit system unit (22) comprises a second intermediate pressure cylinder steam exhaust valve (7), a second temperature and pressure reducing valve (8), a second intermediate pressure cylinder steam exhaust adjusting valve (9), a second cylinder cooling steam pipeline (10), a second low pressure cylinder (16), a second high pressure cylinder (20) and a second intermediate pressure cylinder (18);
the outlet of the first intermediate pressure cylinder exhaust valve (1) is connected with the outlet of the second intermediate pressure cylinder exhaust valve (7) through an intermediate pressure cylinder exhaust connecting pipe (3), and an intermediate pressure cylinder exhaust connecting pipe adjusting valve (6) is installed on the intermediate pressure cylinder exhaust connecting pipe (3);
a first steam cylinder cooling steam pipeline (5) is led out in a branch way from a steam exhaust connecting pipe (3) of a middle pressure cylinder at the outlet of a first middle pressure cylinder steam exhaust valve (1) 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 steam cylinder cooling steam pipeline (10) is led out in a branch way from a steam exhaust connecting pipe (3) of a middle pressure cylinder at the outlet of a second middle pressure cylinder steam exhaust valve (7) 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 installed on the first low pressure cylinder cooling steam pipeline (5) and the second steam cylinder cooling pipeline (10);
a first intermediate pressure cylinder steam exhaust adjusting steam valve (4) is further arranged between the outlet of the first intermediate pressure cylinder steam exhaust steam valve (1) and the steam inlet of the first low pressure cylinder (15), and a second intermediate pressure cylinder steam exhaust adjusting steam valve (9) is further arranged between the outlet of the second intermediate pressure cylinder steam exhaust steam valve (7) and the steam inlet of the second low pressure cylinder (16);
a water supply connecting pipe (14) is connected between water side outlets of No. 7 low-pressure heaters of the two turbines, and a water supply flow regulating valve (13) is installed on the water supply connecting pipe (14);
a drain connecting pipe (11) is connected between drain inlets of No. 7 low-pressure heaters of the two turbines, and a drain flow regulating valve (12) is installed on the drain connecting pipe (11).
2. A thermodynamic system with two machines operating at ultra low load as claimed in claim 1, wherein the first unit system (21) and the second unit system (22) have the same power generation capacity and capacity, and the equipment type and thermodynamic system design are the same.
3. A thermodynamic system with two turbines for ultra low load operation according to claim 1, wherein the operating conditions of the first and second unit (21, 22) are one boiler operating, the other boiler off standby, or both turbines in power generating operation at the same time.
4. A thermal system for ultra low load operation of a furnace with two units according to claim 1, wherein the exhaust steam of the first intermediate pressure cylinder (17) of the first unit (21) enters the second low pressure cylinder (16) of the second unit (22) through the intermediate pressure cylinder exhaust steam connection pipe (3).
5. A thermal system with two machines operating at ultra low load of a furnace as claimed in claim 1, wherein the steam extraction trap of the first high pressure cylinder (19) and the first intermediate pressure cylinder (17) of the first unit system set (21) enters the steam extraction trap system of the second low pressure cylinder (16) of the second unit system set (22) through the trap connection pipe (11).
6. A thermal system with two machines operating in ultra low load of a furnace according to claim 1, characterized in that the steam extraction heating feedwater corresponding to the second low pressure cylinder (16) of the second unit making machine set (22) enters the feedwater heat recovery system of the first high pressure cylinder (19) and the first intermediate pressure cylinder (17) of the first unit making machine set (21) through the feedwater connection pipe (14).
7. A furnace with two machines operating at ultra low load as claimed in claim 1, characterized in that the first cylinder cooling steam line (5) is connected to the intermediate cylinder exhaust connection (3) in the form of a bypass branch, wherein the steam is led via the first pressure and temperature reducing valve (2) to the first high pressure cylinder (19) and the first intermediate pressure cylinder (17).
8. A furnace thermal system operating at ultra low load as claimed in claim 1 wherein the second cylinder cooling steam line (10) is connected to the intermediate pressure cylinder exhaust connection (3) by a bypass branch, wherein steam is passed through the second pressure and temperature reducing valve (8) to the second low pressure cylinder (16).
9. A method for switching over the operation of a furnace with two machines under ultra low load, which is based on the thermodynamic system of any one of claims 1 to 8, and is illustrated by taking the first unit (21) for normal operation and the second unit (22) for shutdown as an example as follows:
step 1, operating a first intermediate pressure cylinder steam exhaust valve (1), a first intermediate pressure cylinder steam exhaust adjusting valve (4) and a first temperature and pressure reducing valve (2) of a first unit system unit (21) to be in an opening state; a second intermediate pressure cylinder steam exhaust valve (7), a second intermediate pressure cylinder steam exhaust adjusting valve (9) and a second temperature and pressure reducing valve (8) of the standby second unit system unit (22) are in a closed state; the intermediate pressure cylinder exhaust connecting pipe adjusting valve (6), the water supply flow adjusting valve (13), the drainage flow adjusting 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, fully opening a steam exhaust connecting pipe adjusting valve (6) of the intermediate pressure cylinder and a steam exhaust adjusting valve (9) of the second intermediate pressure cylinder; slowly closing a steam exhaust adjusting valve (4) of the first intermediate pressure cylinder and opening a first temperature and pressure reducing valve (2) to enable cooling steam to enter a first low pressure cylinder (17) through a first cylinder cooling steam pipeline (5);
step 3, starting a condenser and a condensate pump system of the second unit-making unit (22), and gradually stopping the condenser and the condensate pump system of the first unit-making unit (21); a fully opened feed water flow regulating valve (13) and a drain water flow regulating valve (12); and opening the second temperature and pressure reducing valve (8) to enable the cooling steam to enter a second high-pressure cylinder (20) and a second intermediate-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 units according to claim 9, wherein a boiler of a first unit system unit (21) is in an operating state, a boiler of a second unit system unit (22) is in a hot standby state, both 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202110296622.3A CN112879110A (en) | 2021-03-19 | 2021-03-19 | Thermodynamic system with one furnace and two machines operating at ultralow load and switching method thereof |
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| CN202110296622.3A CN112879110A (en) | 2021-03-19 | 2021-03-19 | Thermodynamic system with one furnace and two machines operating at ultralow load and switching method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113431648A (en) * | 2021-06-29 | 2021-09-24 | 西安热工研究院有限公司 | Reheater structure of header reheating system |
| CN114251139A (en) * | 2021-12-08 | 2022-03-29 | 西安热工研究院有限公司 | Quick start system of adjacent machine of unit system thermal generator set |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113431648A (en) * | 2021-06-29 | 2021-09-24 | 西安热工研究院有限公司 | Reheater structure of header reheating system |
| 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 |
| CN114251139A (en) * | 2021-12-08 | 2022-03-29 | 西安热工研究院有限公司 | Quick start system of adjacent machine of unit system thermal generator set |
| 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 |
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