CN214464455U - Depth peak regulation system based on thermodynamic system coupling among units - Google Patents
Depth peak regulation system based on thermodynamic system coupling among units Download PDFInfo
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Abstract
The utility model discloses a depth peak shaving system based on thermodynamic system coupling between units, this system includes two high-pressure main valves, two high-pressure cylinders, two intermediate pressure cylinders, two low pressure cylinders, two condensate pumps, two intermediate pressure cylinder exhaust control, the isolation valves, main steam contact pipe control, the isolation valves, intermediate pressure cylinder exhaust contact pipe control, the isolation valves, low pressure feed water contact pipe control, the isolation valves, two high, intermediate pressure cylinder minimum cooling steam admission pipeline control, the isolation valves, two low pressure cylinder minimum cooling steam pipeline control, the isolation valves, main steam contact pipe, intermediate pressure cylinder exhaust contact pipe, low pressure feed water contact pipe, two high, intermediate pressure cylinder minimum cooling steam admission pipelines, and two low pressure cylinder minimum cooling steam pipelines; the utility model discloses a nimble switching of two sets of conventional unit system generating set. The utility model discloses need not to carry out technological transformation to the boiler side, can promote the degree of depth peak shaving ability of unit, increase the flexibility of unit operation.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation, concretely relates to unit is based on the degree of depth peak shaving system of thermodynamic system coupling.
Background
At present, a unit system operation method is widely adopted in domestic large-capacity thermal power plants, namely, a boiler supplies steam for a steam turbine, and the steam turbine drives a generator to generate electricity, so that an independent power generation unit of the boiler, the steam turbine and the generator is formed. And the power generation units are basically not in transverse connection. 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. Chinese patent publication CN109653810A discloses a thermodynamic system with two machines switching operation in one furnace, which is characterized in that a superheated steam and reheated steam bypass and a control valve are added, when one boiler fails, the other boiler is used to drive two steam turbines to generate electricity, at this time, the set has a certain peak shaving capability, but the system is complex in arrangement, low in operation flexibility, and poor in operability in actual operation of a power plant.
In recent years, with the continuous promotion of upgrading and transforming work of thermal power generating units, a thermodynamic system capable of realizing coupling connection among high-capacity thermal power generating units is urgently needed to enhance the flexibility of the thermal power generating units for adapting to electric load dispatching instructions and improve the deep peak regulation capacity of the thermal power generating units.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a degree of depth peak shaving system based on thermodynamic system coupling between unit, it need not to carry out technical transformation to the boiler side, can promote the degree of depth peak shaving ability of unit, increases the flexibility of unit operation.
The utility model discloses a realize through following technical scheme:
a depth peak regulation system based on thermodynamic system coupling among units comprises a first conventional unit-system generator set and a second conventional unit-system generator set;
the system comprises a first high-pressure main valve, a second high-pressure main valve, a first high-pressure cylinder, a second high-pressure cylinder, a first intermediate pressure cylinder, a second intermediate pressure cylinder, a first low-pressure cylinder, a second low-pressure cylinder, a first condensate pump, a second condensate pump, a first intermediate pressure cylinder steam exhaust control, an isolation valve group, a second intermediate pressure cylinder steam exhaust control, an isolation valve group, a main steam communication pipe control, an isolation valve group, an intermediate pressure cylinder steam exhaust communication pipe control, an isolation valve group, a low-pressure water supply communication pipe control, an isolation valve group, a first high-pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group, a second high-pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group, a first low-pressure cylinder minimum cooling steam pipeline control, an isolation valve group, a second low-pressure cylinder minimum cooling steam pipeline control, an isolation valve group, a main steam communication pipe, an intermediate pressure cylinder steam supply steam exhaust communication pipe, a low-pressure cylinder minimum cooling steam inlet communication pipe, the minimum cooling steam inlet pipeline of the first high pressure cylinder, the minimum cooling steam inlet pipeline of the middle pressure cylinder, the minimum cooling steam inlet pipeline of the second high pressure cylinder and the minimum cooling steam inlet pipeline of the middle pressure cylinder, the minimum cooling steam pipeline of the first low pressure cylinder and the minimum cooling steam pipeline of the second low pressure cylinder;
the intermediate pressure cylinder steam exhaust connecting pipe is connected between a steam exhaust outlet of a first intermediate pressure cylinder and a steam exhaust outlet of a second intermediate pressure cylinder of the two turbines, and an intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group is installed on the intermediate pressure cylinder steam exhaust connecting pipe;
the main steam connecting pipe is connected between the steam inlet of a first high-pressure main throttle valve and the steam inlet of a second high-pressure main throttle valve of the two turbines, and a main steam connecting pipe control and isolation valve group is installed on the main steam connecting pipe;
the first intermediate pressure cylinder steam exhaust control and isolation valve group is connected between a steam exhaust port of the first intermediate pressure cylinder and a steam inlet of the first low pressure cylinder, and the second intermediate pressure cylinder steam exhaust control and isolation valve group is connected between a steam exhaust port of the second intermediate pressure cylinder and a steam inlet of the second low pressure cylinder;
a first low-pressure cylinder minimum cooling steam pipeline is connected between the inlet and the outlet of the first intermediate-pressure cylinder steam exhaust control and isolation valve group, a second low-pressure cylinder minimum cooling steam pipeline is connected between the inlet and the outlet of the second intermediate-pressure cylinder steam exhaust control and isolation valve group, a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group is installed on the first low-pressure cylinder minimum cooling steam pipeline, and a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group is installed on the second low-pressure cylinder minimum cooling steam pipeline;
the minimum cooling steam inlet pipeline of the first high-pressure and medium-pressure cylinder is connected between the inlet and the outlet of the first high-pressure main throttle valve, the minimum cooling steam inlet pipeline of the second high-pressure and medium-pressure cylinder is connected between the inlet and the outlet of the second high-pressure main throttle valve, the minimum cooling steam inlet pipeline of the first high-pressure and medium-pressure cylinder is provided with a first minimum cooling steam inlet pipeline control and isolation valve group, and the minimum cooling steam inlet pipeline of the second high-pressure and medium-pressure cylinder is provided with a second minimum cooling steam inlet pipeline control and isolation valve group;
the low-pressure water supply connecting pipe is connected between the outlet of the first condensate pump and the outlet of the second condensate pump of the two turbines, and a low-pressure water supply connecting pipe control and isolation valve group is installed on the low-pressure water supply connecting pipe;
the main steam of the first conventional unit-system generator set can enter a second high-pressure cylinder and a second intermediate-pressure cylinder of the second conventional unit-system generator set through the main steam communication pipe to do work, and the main steam of the second conventional unit-system generator set can enter a first high-pressure cylinder and a first intermediate-pressure cylinder of the first conventional unit-system generator set through the main steam communication pipe to do work.
The utility model discloses further improvement lies in, first conventional unit system generating set and second conventional unit system generating set's generating capacity is the same, the capacity is equivalent, and equipment type and thermodynamic system design are unanimous.
The utility model discloses further improvement lies in, and the running state of first conventional unit system generating set and second conventional unit system generating set is that two boilers, two steam turbines all are in running state.
The utility model discloses a further improvement lies in, when the second high pressure main steam door of second conventional unit system generating set closed, the main steam of second conventional unit system generating set can get into second high pressure cylinder and second intermediate pressure cylinder via second high, intermediate pressure cylinder minimum cooling steam admission pipeline, guarantees the safe operation of second high pressure cylinder and second intermediate pressure cylinder;
when a first high-pressure main steam valve of the first conventional unit system generator set is closed, main steam of the first conventional unit system generator set can enter the first high-pressure cylinder and the first intermediate-pressure cylinder through the minimum cooling steam inlet pipeline of the first high-pressure cylinder and the first intermediate-pressure cylinder, and safe operation of the first high-pressure cylinder and the first intermediate-pressure cylinder is guaranteed.
The utility model has the further improvement that the first intermediate pressure cylinder exhaust steam of the first conventional unit-system generator set can enter the second low pressure cylinder of the second conventional unit-system generator set to do work through the intermediate pressure cylinder exhaust connecting pipe;
the second intermediate pressure cylinder exhaust steam of the second conventional unit-made generator set can enter the first low pressure cylinder of the first conventional unit-made generator set to do work through the intermediate pressure cylinder exhaust steam communication pipe.
The utility model has the further improvement that the condensed water at the outlet of the first condensed water pump of the first conventional unit generating set enters the low-pressure water supply system of the second conventional unit generating set through the low-pressure water supply connecting pipe to maintain the stable water level of the deaerator of the second conventional unit generating set;
and the condensed water at the outlet of the second condensed water pump of the second conventional unit generator set enters the low-pressure water supply system of the first conventional unit generator set through the low-pressure water supply connecting pipe so as to maintain the water level of the deaerator of the first conventional unit generator set to be stable.
The utility model has the further improvement that when the second intermediate pressure cylinder steam exhaust control and the isolation valve set of the second conventional unit-made generating set are closed, partial intermediate pressure cylinder steam exhaust of the second conventional unit-made generating set enters the second low pressure cylinder to cool the low pressure cylinder through the second low pressure cylinder minimum cooling steam pipeline, and the safe operation of the second low pressure cylinder is ensured;
when the first intermediate pressure cylinder steam exhaust control and the isolation valve group of the first conventional unit-made generator set are closed, part of intermediate pressure cylinder steam exhaust of the first conventional unit-made generator set enters the first low pressure cylinder through the first low pressure cylinder minimum cooling steam pipeline to cool the low pressure cylinder, and the safe operation of the first low pressure cylinder is ensured.
The utility model discloses further improvement lies in, the running state of first conventional unit system generating set and second conventional unit system generating set can switch over each other.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a depth peak-shaving system based on thermodynamic system coupling between units, through addding main steam connecting pipe, intermediate pressure cylinder exhaust connecting pipe, low pressure feed water connecting pipe, high, intermediate pressure cylinder minimum cooling steam admission pipeline, low pressure cylinder minimum cooling steam pipeline, realized the switching of arbitrary unit depth peak-shaving operational mode; when one unit operates in deep peak regulation, the main steam inlet amount and the low-pressure cylinder steam inlet amount can be reduced to the minimum, at the moment, the unit maintains the minimum work capacity, and the deep peak regulation capacity of the unit is increased. Utilize the utility model discloses, under the degree of depth peak regulation operating mode, can carry the most main steam of a unit and low pressure jar steam admission volume to another unit, realized that a unit is littleer technique is exerted oneself. The flexibility of the unit adapting to the dispatching electric load instruction is enhanced, the deep peak regulation electricity price income of the power plant is increased, and the production and operation benefits of the power plant are improved.
Drawings
Fig. 1 is a schematic diagram of a thermodynamic system of a deep peak shaving system based on thermodynamic system coupling among units according to an embodiment of the present invention.
Description of reference numerals:
1. a first intermediate pressure cylinder steam exhaust control and isolation valve group, 2, a second intermediate pressure cylinder steam exhaust control and isolation valve group; 3. a control and isolation valve group of the intermediate pressure cylinder exhaust connecting pipe; 4. the intermediate pressure cylinder exhausts the union pipe; 5. a low pressure feed water interconnecting pipe; 6. a low-pressure water supply connecting pipe control and isolation valve group; 7. a first intermediate pressure cylinder; 8. a first low pressure cylinder; 9. a second intermediate pressure cylinder; 10. a second low pressure cylinder; 11. a first condensate pump 12, a second condensate pump; 13. a first conventional unit-made generator set, 14, a second conventional unit-made generator set; 15. a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 17 and a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group; 16. a first low pressure cylinder minimum cooling steam line, 18, a second low pressure cylinder minimum cooling steam line; 19. a main steam interconnecting pipe; 20. a main steam connecting pipe control and isolation valve group; 21. a first high pressure main valve; 22. the minimum cooling steam inlet pipeline of the first high pressure cylinder and the first medium pressure cylinder; 23. a first high pressure cylinder and a first intermediate pressure cylinder minimum cooling steam inlet pipeline control and isolation valve group; 24. a second high pressure main valve; 25. the minimum cooling steam inlet pipeline of the second high and medium pressure cylinders; 26. a second high pressure cylinder and a second medium pressure cylinder minimum cooling steam inlet pipeline control and isolation valve group; 27. a first high pressure cylinder; 28. and a second high pressure cylinder.
Detailed Description
The present invention will now be described in further detail with reference to specific embodiments thereof, which are illustrated and not limited by the accompanying drawings.
As shown in fig. 1, the present invention provides a deep peak shaving system based on thermodynamic system coupling between units, which includes a first conventional unit-system generator set 13 and a second conventional unit-system generator set 14, wherein the two conventional unit-system generator sets have substantially the same capacity, equipment type and thermodynamic system.
Specifically comprises a first high-pressure main valve 21, a second high-pressure main valve 24, a first high-pressure cylinder 27, a second high-pressure cylinder 28, a first intermediate pressure cylinder 7, a second intermediate pressure cylinder 9, a first low-pressure cylinder 8, a second low-pressure cylinder 10, a first condensate pump 11, a second condensate pump 12, a first intermediate pressure cylinder steam exhaust control, an isolation valve group 1, a second intermediate pressure cylinder steam exhaust control, an isolation valve group 2, a main steam communication pipe control, an isolation valve group 20, an intermediate pressure cylinder steam exhaust communication pipe control, an isolation valve group 3, a low-pressure water supply communication pipe control, an isolation valve group 6, a first high-pressure and intermediate pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group 23, a second high-pressure and intermediate pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group 26, a first low-pressure cylinder minimum cooling steam pipeline control, an isolation valve group 15, a second low-pressure cylinder minimum cooling steam pipeline control, an isolation valve group 17 and a main steam communication pipe 19, the system comprises an intermediate pressure cylinder steam exhaust connecting pipe 4, a low pressure water supply connecting pipe 5, a first high pressure cylinder minimum cooling steam inlet pipeline 22, a second high pressure cylinder minimum cooling steam inlet pipeline 25, a first low pressure cylinder minimum cooling steam pipeline 16 and a second low pressure cylinder minimum cooling steam pipeline 18.
The intermediate pressure cylinder steam exhaust connecting pipe 4 is connected between a steam exhaust outlet of a first intermediate pressure cylinder 7 and a steam exhaust outlet of a second intermediate pressure cylinder 9 of the two turbines, and the intermediate pressure cylinder steam exhaust connecting pipe 4 is provided with an intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group 3; the main steam connecting pipe 19 is connected between a first high-pressure main valve 21 and a second high-pressure main valve 24 of the two turbines, and a main steam connecting pipe control and isolation valve group 20 is installed on the main steam connecting pipe 19; the first intermediate pressure cylinder steam exhaust control and isolation valve group 1 is connected between a steam exhaust port of a first intermediate pressure cylinder 7 and a steam inlet of a first low pressure cylinder 8 of the two turbines, and the second intermediate pressure cylinder steam exhaust control and isolation valve group 2 is connected between a steam exhaust port of a second intermediate pressure cylinder 9 and a steam inlet of a second low pressure cylinder 10 of the two turbines; a first low-pressure cylinder minimum cooling steam pipeline 16 is further connected between the inlet and the outlet of the first intermediate-pressure cylinder steam exhaust control and isolation valve group 1, a second low-pressure cylinder minimum cooling steam pipeline 18 is further connected between the inlet and the outlet of the second intermediate-pressure cylinder steam exhaust control and isolation valve group 2, a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 15 is installed on the first low-pressure cylinder minimum cooling steam pipeline 16, and a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 17 is installed on the second low-pressure cylinder minimum cooling steam pipeline 18; the minimum cooling steam inlet pipeline 22 of the first high-pressure and medium-pressure cylinder is connected between the inlet and the outlet of the first high-pressure main valve 21, the minimum cooling steam inlet pipeline 25 of the second high-pressure and medium-pressure cylinder is connected between the inlet and the outlet of the second high-pressure main valve 24, the minimum cooling steam inlet pipeline 22 of the first high-pressure and medium-pressure cylinder is provided with a first minimum cooling steam inlet pipeline control and isolation valve group 23, and the minimum cooling steam inlet pipeline 25 of the second high-pressure and medium-pressure cylinder is provided with a second minimum cooling steam inlet pipeline control and isolation valve group 26; the low-pressure water supply connecting pipe 5 is connected between the outlet of the first condensate pump 11 and the outlet of the second condensate pump 12 of the two turbines, and the low-pressure water supply connecting pipe 5 is provided with a low-pressure water supply connecting pipe control and isolation valve group 6.
Preferably, a main steam connecting pipe control and isolation valve group 20 is installed on the main steam connecting pipe 19, so that switching of the deep peak shaving operation mode of a single unit is realized.
Preferably, the intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group 3 is installed on the intermediate pressure cylinder steam exhaust connecting pipe 4, and switching of a deep peak regulation operation mode of a single unit is achieved.
Preferably, a first intermediate pressure cylinder steam exhaust control and isolation valve group 1 is installed on an intermediate pressure cylinder steam exhaust pipe of the first conventional unit-made generator set 13, and the valve group can control the steam intake of the first low pressure cylinder 8 and cooperate with the first high pressure main throttle valve 21 to jointly adjust the output of the first conventional unit-made generator set 13.
Preferably, a second intermediate pressure cylinder steam exhaust control and isolation valve group 2 is installed on the intermediate pressure cylinder steam exhaust pipe of the second conventional unit-made generator set 14, and the valve group can control the steam intake of the second low pressure cylinder 10 and cooperate with the second high pressure main throttle valve 24 to jointly adjust the output of the second conventional unit-made generator set 14.
Preferably, the minimum cooling steam inlet pipeline control and isolation valve group 23 of the first high and intermediate pressure cylinder is installed on the minimum cooling steam inlet pipeline 22 of the first conventional unit system generator set 13, and the valve group can maintain the minimum steam inlet amount of the first high pressure cylinder 27, so as to ensure the safe operation of the first high pressure cylinder 27 and the first intermediate pressure cylinder 7.
Preferably, the minimum cooling steam inlet pipeline 25 of the second high and medium pressure cylinder of the second conventional unit-system generator set 14 is provided with a control and isolation valve bank 26 of the minimum cooling steam inlet pipeline of the second high and medium pressure cylinder, and the valve bank can maintain the minimum steam inlet amount of the second high pressure cylinder 28 and ensure the safe operation of the second high pressure cylinder 28 and the second medium pressure cylinder 9.
Preferably, the first low-pressure cylinder minimum cooling steam pipeline 16 of the first conventional unit-system generator set 13 is provided with a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 15, which can maintain the minimum steam inlet amount of the first low-pressure cylinder 8 and ensure the safe operation of the first low-pressure cylinder 8.
Preferably, the second minimum cooling steam pipeline 18 of the second conventional unit-system generator set 14 is provided with a control and isolation valve group 17 of the first minimum cooling steam pipeline of the low pressure cylinder, which can maintain the minimum steam admission amount of the second low pressure cylinder 10 and ensure the safe operation of the second low pressure cylinder 10.
Preferably, a low-pressure water supply connecting pipe control and isolation valve group 6 is arranged on the low-pressure water supply connecting pipe 5 and used for adjusting the low-pressure water supply flow of the two units in the deep peak shaving process and maintaining the stable water level of the deaerator.
The utility model provides a pair of operation method of degree of depth peak shaving system based on thermodynamic system coupling between unit, including following step:
step 1, a first conventional unit-made generator set 13 and a second conventional unit-made generator set 14 run normally, and a high-first high-pressure main throttle 21 and a second high-pressure main throttle 24 keep normal running states; the main steam connecting pipe control and isolation valve group 20 of the main steam connecting pipe 19 is in a closed state; the intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group 3 of the intermediate pressure cylinder steam exhaust connecting pipe 4 is in a closed state; the low-pressure water supply connecting pipe control and isolation valve group 6 of the low-pressure water supply connecting pipe 5 is in a closed state; a first intermediate pressure cylinder steam exhaust control and isolation valve group 1 of a first conventional unit-system generator set 13 is in an open state; the minimum cooling steam inlet pipeline control and isolation valve group 23 of the first high and medium pressure cylinders of the first conventional unit-system generator set 13 is in a closed state; the first low-pressure cylinder minimum cooling steam pipeline of the first conventional unit generator set 13 is controlled, and the isolation valve group 15 is in a closed state; the second intermediate pressure cylinder steam exhaust control and isolation valve group 2 of the second conventional unit-system generator set 14 is in an open state; the second high and medium pressure cylinder minimum cooling steam admission line control, isolation valve bank 26 of the second conventional unit system generator set 14 is in a closed state; the second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 17 of the second conventional unit generator set 14 is in a closed state;
step 3, the main steam connecting pipe control and isolation valve group 20 of the main steam connecting pipe 19 is kept open; the intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group 3 of the intermediate pressure cylinder steam exhaust connecting pipe 4 is kept open; a first high-pressure main throttle valve 21 of the first conventional unit generator set 13 is slowly opened; a first intermediate pressure cylinder steam exhaust control and isolation valve group 1 of a first conventional unit-system generator set 13 is slowly opened; the first high and medium pressure cylinder minimum cooling steam inlet pipeline control and isolation valve group 23 of the first conventional unit system generator set 13 is closed slowly; the first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 15 of the first conventional unit system generator set 13 is slowly closed; the second high and medium pressure cylinder minimum cooling steam admission line control and isolation valve bank 26 of the second conventional unit system generator set 14 is opened; a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 17 of the second conventional unit generator set 14 is opened; the second high-pressure main throttle 24 of the second conventional unit-system generator set 14 is slowly closed; the second intermediate pressure cylinder steam exhaust control and the isolating valve group 2 of the second conventional unit-system generator set 14 are slowly closed; the low-pressure water supply control and isolation valve group 6 is kept open; maintaining the water level of the deaerator of the second conventional unit generator set 14 to be stable; and realizing the deep peak shaving operation of the second conventional unit generator set 14.
The above only is the concrete implementation of the preferred embodiment of the present invention, not therefore the limitation of the patent scope of the present invention, all the applications of the equivalent structure or equivalent flow transformation made by the contents of the specification and the drawings or the application to multiple units, or the direct or indirect application in other related technical fields, all the same principles are included in the patent protection scope of the present invention.
Claims (8)
1. The depth peak-shaving system based on thermodynamic system coupling among units is characterized by comprising a first conventional unit generator set (13) and a second conventional unit generator set (14);
the steam-exhaust system specifically comprises a first high-pressure main steam valve (21), a second high-pressure main steam valve (24), a first high-pressure cylinder (27), a second high-pressure cylinder (28), a first intermediate pressure cylinder (7), a second intermediate pressure cylinder (9), a first low-pressure cylinder (8), a second low-pressure cylinder (10), a first condensate pump (11), a second condensate pump (12), a first intermediate pressure cylinder steam-exhaust control, an isolation valve group (1), a second intermediate pressure cylinder steam-exhaust control, an isolation valve group (2), a main steam connection pipe control, an isolation valve group (20), an intermediate pressure cylinder steam-exhaust connection pipe control, an isolation valve group (3), a low-pressure water supply connection pipe control, an isolation valve group (6), a first high-pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group (23), a second high-pressure cylinder minimum cooling steam inlet pipeline control, an isolation valve group (26), a first low-pressure cylinder minimum cooling steam pipeline control, a second high-pressure cylinder minimum cooling steam inlet pipeline control, a first low-steam inlet pipeline control, a second high-pressure cylinder minimum cooling steam inlet control, a second condensate pump, a second, a third, a second, a third, a fourth, The steam-steam cooling system comprises an isolation valve group (15), a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group (17), a main steam connecting pipe (19), a medium-pressure cylinder steam exhaust connecting pipe (4), a low-pressure water supply connecting pipe (5), a first high-pressure cylinder minimum cooling steam inlet pipeline (22), a second high-pressure cylinder minimum cooling steam inlet pipeline (25), a first low-pressure cylinder minimum cooling steam pipeline (16) and a second low-pressure cylinder minimum cooling steam pipeline (18);
the intermediate pressure cylinder steam exhaust connecting pipe (4) is connected between a steam exhaust outlet of a first intermediate pressure cylinder (7) and a steam exhaust outlet of a second intermediate pressure cylinder (9) of the two turbines, and the intermediate pressure cylinder steam exhaust connecting pipe (4) is provided with an intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group (3);
the main steam connecting pipe (19) is connected between the steam inlets of the first high-pressure main throttle valve (21) and the second high-pressure main throttle valve (24) of the two turbines, and a main steam connecting pipe control and isolation valve group (20) is installed on the main steam connecting pipe (19);
the first intermediate pressure cylinder steam exhaust control and isolation valve group (1) is connected between a steam exhaust port of the first intermediate pressure cylinder (7) and a steam inlet of the first low pressure cylinder (8), and the second intermediate pressure cylinder steam exhaust control and isolation valve group (2) is connected between a steam exhaust port of the second intermediate pressure cylinder (9) and a steam inlet of the second low pressure cylinder (10);
a first low-pressure cylinder minimum cooling steam pipeline (16) is further connected between an inlet and an outlet of the first intermediate-pressure cylinder steam exhaust control and isolation valve group (1), a second low-pressure cylinder minimum cooling steam pipeline (18) is further connected between an inlet and an outlet of the second intermediate-pressure cylinder steam exhaust control and isolation valve group (2), a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group (15) are installed on the first low-pressure cylinder minimum cooling steam pipeline (16), and a second low-pressure cylinder minimum cooling steam pipeline control and isolation valve group (17) are installed on the second low-pressure cylinder minimum cooling steam pipeline (18);
a first high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline (22) is connected between the inlet and the outlet of a first high-pressure main steam valve (21), a second high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline (25) is connected between the inlet and the outlet of a second high-pressure main steam valve (24), a first high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline control and isolation valve group (23) is installed on the first high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline (22), and a second high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline control and isolation valve group (26) is installed on the second high-pressure and medium-pressure cylinder minimum cooling steam inlet pipeline (25);
the low-pressure water supply connecting pipe (5) is connected between the outlet of a first condensate pump (11) and the outlet of a second condensate pump (12) of the two turbines, and a low-pressure water supply connecting pipe control and isolation valve group (6) is installed on the low-pressure water supply connecting pipe (5);
the main steam of the first conventional unit generator set (13) can enter a second high-pressure cylinder (28) and a second intermediate-pressure cylinder (9) of the second conventional unit generator set (14) through a main steam communication pipe (19) to do work, and the main steam of the second conventional unit generator set (14) can enter a first high-pressure cylinder (27) and a first intermediate-pressure cylinder (7) of the first conventional unit generator set (13) through the main steam communication pipe (19) to do work.
2. The inter-unit thermodynamic system coupling-based deep peak shaving system according to claim 1, wherein the first conventional unit generator set (13) and the second conventional unit generator set (14) have the same power generation capacity and capacity, and the equipment type and thermodynamic system design are the same.
3. An inter-unit thermodynamic system coupling-based depth peaking system according to claim 1, wherein the first conventional unit generator set (13) and the second conventional unit generator set (14) are operated in a state where both boilers and turbines are in operation.
4. A deep peak shaving system based on thermodynamic system coupling among units as claimed in claim 1, wherein when the second high pressure main valve (24) of the second conventional unit generator set (14) is closed, the main steam of the second conventional unit generator set (14) can enter the second high pressure cylinder (28) and the second intermediate pressure cylinder (9) via the second high and intermediate pressure cylinder minimum cooling steam inlet pipeline (25), ensuring the safe operation of the second high pressure cylinder (28) and the second intermediate pressure cylinder (9);
when a first high-pressure main throttle valve (21) of the first conventional unit-system generator set (13) is closed, main steam of the first conventional unit-system generator set (13) can enter a first high-pressure cylinder (27) and a first intermediate-pressure cylinder (7) through a first high-pressure and intermediate-pressure cylinder minimum cooling steam inlet pipeline (22), and safe operation of the first high-pressure cylinder (27) and the first intermediate-pressure cylinder (7) is guaranteed.
5. The inter-unit thermodynamic system coupling-based depth peaking system according to claim 1, wherein the exhaust steam of a first intermediate pressure cylinder (7) of a first conventional unit generator set (13) can enter a second low pressure cylinder (10) of a second conventional unit generator set (14) through an intermediate pressure cylinder exhaust steam communication pipe (4) to do work;
the exhaust steam of a second intermediate pressure cylinder (9) of the second conventional unit-system generator set (14) can enter a first low pressure cylinder (8) of the first conventional unit-system generator set (13) through an intermediate pressure cylinder exhaust steam communication pipe (4) to do work.
6. The inter-unit thermodynamic system coupling-based depth peaking system according to claim 1, wherein the condensed water at the outlet of the first condensed water pump (11) of the first conventional unit generating set (13) enters the low pressure water supply system of the second conventional unit generating set (14) from the low pressure water supply communication pipe (5) to maintain the deaerator water level of the second conventional unit generating set (14) stable;
condensed water at the outlet of a second condensed water pump (12) of a second conventional unit generating set (14) enters a low-pressure water supply system of a first conventional unit generating set (13) through a low-pressure water supply communication pipe (5) so as to maintain the water level of a deaerator of the first conventional unit generating set (13) stable.
7. The inter-unit thermodynamic system coupling-based depth peaking system according to claim 1, wherein when a second intermediate pressure cylinder exhaust steam control and isolation valve group (2) of the second conventional unit generator set (14) is closed, partial intermediate pressure cylinder exhaust steam of the second conventional unit generator set (14) enters the second low pressure cylinder (10) through a second low pressure cylinder minimum cooling steam pipeline (18) to cool the low pressure cylinder, so that safe operation of the second low pressure cylinder (10) is ensured;
when a first intermediate pressure cylinder steam exhaust control and isolation valve group (1) of the first conventional unit-made generator set (13) is closed, part of intermediate pressure cylinder steam exhaust of the first conventional unit-made generator set (13) enters the first low pressure cylinder (8) through the first low pressure cylinder minimum cooling steam pipeline (16) to cool the low pressure cylinder, and safe operation of the first low pressure cylinder (8) is guaranteed.
8. An inter-cluster thermodynamic system coupling-based depth peaking system according to claim 1, wherein the operation states of the first conventional unit system generator set (13) and the second conventional unit system generator set (14) can be switched to each other.
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| CN202120567157.8U CN214464455U (en) | 2021-03-19 | 2021-03-19 | Depth peak regulation system based on thermodynamic system coupling among units |
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| CN202120567157.8U CN214464455U (en) | 2021-03-19 | 2021-03-19 | Depth peak regulation system based on thermodynamic system coupling among units |
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