CN214464456U - Coupling peak regulation system based on medium-pressure exhaust and low-pressure steam extraction cooling - Google Patents
Coupling peak regulation system based on medium-pressure exhaust and low-pressure steam extraction cooling Download PDFInfo
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- CN214464456U CN214464456U CN202120567159.7U CN202120567159U CN214464456U CN 214464456 U CN214464456 U CN 214464456U CN 202120567159 U CN202120567159 U CN 202120567159U CN 214464456 U CN214464456 U CN 214464456U
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Abstract
The utility model discloses a coupling peak shaving system based on middle-row and low-pressure extraction cooling, which comprises a first conventional unit generating set (13) and a second conventional unit generating set (14); the first conventional unit system generator set (13) comprises a first intermediate pressure cylinder (7), a first low pressure cylinder (8), a first condensate pump (11), a first low pressure cylinder steam extraction pipe (19) and a first intermediate pressure cylinder steam exhaust control and isolation valve group (1), and the second conventional unit system generator set (14) comprises a second intermediate pressure cylinder (9), a second low pressure cylinder (10), a second condensate pump (12), a second low pressure cylinder steam extraction pipe (20) and a second intermediate pressure cylinder steam exhaust control and isolation valve group (2); the operation method of the system realizes flexible switching between the first conventional unit generator set (13) and the second conventional unit generator set (14). 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 coupling peak shaving system based on well row reaches low pressure extraction cooling.
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 and an operation method capable of realizing coupling connection among high-capacity thermal power generating units are urgently needed to enhance the flexibility of the units adapting to electric load dispatching instructions and improve the deep peak regulation capability of the units.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a coupling peak shaving system based on well row reaches low pressure extraction steam cooling, 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:
the coupling peak shaving system based on medium-exhaust and low-pressure extraction cooling comprises a first conventional unit generator set and a second conventional unit generator set;
the first conventional unit system generator set comprises a first intermediate pressure cylinder, a first low pressure cylinder, a first condensate pump, a first low pressure cylinder steam extraction pipe and a first intermediate pressure cylinder steam exhaust control and isolation valve set, and the second conventional unit system generator set comprises a second intermediate pressure cylinder, a second low pressure cylinder, a second condensate pump, a second low pressure cylinder steam extraction pipe and a second intermediate pressure cylinder steam exhaust control and isolation valve set;
a steam exhaust connecting pipe of the intermediate pressure cylinder 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 a control and isolation valve bank of the intermediate pressure cylinder steam exhaust connecting pipe is installed on the intermediate pressure cylinder steam exhaust connecting pipe;
a first intermediate pressure cylinder steam exhaust control and isolation valve group is connected between a steam exhaust port of a first intermediate pressure cylinder and a steam inlet of a first low pressure cylinder of the two turbines, and a second intermediate pressure cylinder steam exhaust control and isolation valve group is connected between a steam exhaust port of a second intermediate pressure cylinder and a steam inlet of a second low pressure cylinder;
a low-pressure cylinder steam extraction connecting pipe is connected between a first low-pressure cylinder steam extraction pipe and a second low-pressure cylinder steam extraction pipe of the two turbines, and a low-pressure cylinder steam extraction connecting pipe control and isolation valve group is installed on the low-pressure cylinder steam extraction connecting pipe;
a first low-pressure cylinder minimum cooling steam pipeline is connected between the low-pressure cylinder steam extraction connecting pipe and a steam inlet of the first low-pressure cylinder, a second low-pressure cylinder minimum cooling steam pipeline is connected between the low-pressure cylinder steam extraction connecting pipe and a steam inlet of the second low-pressure cylinder, 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;
and a 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 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 further improvement lies in, and the first intermediate pressure jar exhaust steam of first conventional unit system generating set can get into the second low pressure jar acting of the conventional unit system generating set of second through intermediate pressure jar exhaust steam interconnecting 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 discloses further improvement lies in, the first condensate pump export condensate water of first conventional unit system generating set can be by the low pressure water supply tie pipe entering second conventional unit system generating set's low pressure water supply system in order to maintain the oxygen-eliminating device water level stability of second conventional unit system generating set.
The condensed water at the outlet of the second condensed water pump of the second conventional unit generator set can enter the low-pressure water supply system of the first conventional unit generator set through the low-pressure water supply communication pipe so as to maintain the water level of the deaerator of the first conventional unit generator set stable.
The utility model discloses further improvement lies in, when second intermediate pressure jar steam extraction control, the isolation valves of second conventional unit system generating set were closed, the low pressure jar of first conventional unit system generating set steam extraction can get into second low pressure jar cooling low pressure jar via first low pressure jar steam extraction pipe, low pressure jar steam extraction tie pipe and second low pressure jar minimum cooling steam pipeline, guarantees the safe operation of second low pressure jar.
The utility model discloses further improvement lies in, when first intermediate pressure jar steam extraction control, the isolation valves of first conventional unit system generating set were closed, the low pressure jar of second conventional unit system generating set steam extraction can get into first low pressure jar cooling low pressure jar via second low pressure jar steam extraction pipe, low pressure jar steam extraction tie pipe and the minimum cooling steam pipeline of first low pressure jar, guarantees the safe operation of first low pressure jar.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model realizes the switching of the depth peak regulation operation mode of any unit by additionally arranging the intermediate pressure cylinder steam exhaust connecting pipe, the low pressure cylinder steam extraction connecting pipe, the low pressure water supply connecting pipe and the low pressure cylinder minimum cooling steam pipeline; when one unit operates in deep peak regulation, the steam inlet flow of the low-pressure cylinder can be reduced to the minimum, the low-pressure cylinder maintains the minimum work capacity at the moment, 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 be with the whole low pressure jar that carry to another unit low pressure jar of steam admission volume of a unit, realized that a unit is littleer technique and exerted force. 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 coupled peak shaving system based on middle-exhaust and low-pressure extraction cooling 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 first low-pressure cylinder steam extraction pipe, 20 and a second low-pressure cylinder steam extraction pipe; 21. a low-pressure cylinder steam extraction connecting pipe control and isolation valve group; 22. the low-pressure cylinder draws vapour interconnecting pipe.
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 utility model provides a coupling peak shaving system based on middle drainage and low pressure extraction cooling, including two capacity, equipment type and the basically unanimous first conventional unit system generating set 13 of thermodynamic system and second conventional unit system generating set 14.
The first conventional unit system generator set 13 comprises a first intermediate pressure cylinder 7, a first low pressure cylinder 8, a first condensate pump 11, a first low pressure cylinder steam extraction pipe 19 and a first intermediate pressure cylinder steam exhaust control and isolation valve group 1, and the second conventional unit system generator set 14 comprises a second intermediate pressure cylinder 9, a second low pressure cylinder 10, a second condensate pump 12, a second low pressure cylinder steam extraction pipe 20 and a second intermediate pressure cylinder steam exhaust control and isolation valve group 2; an 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 an 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; a 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 a 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; a low-pressure cylinder steam extraction connecting pipe 22 is connected between a first low-pressure cylinder steam extraction pipe 19 and a second low-pressure cylinder steam extraction pipe 20 of the two turbines, and a low-pressure cylinder steam extraction connecting pipe control and isolation valve group 21 is installed on the low-pressure cylinder steam extraction connecting pipe 22; a first low-pressure cylinder minimum cooling steam pipeline 16 is connected between the low-pressure cylinder steam extraction connecting pipe 22 and a steam inlet of the first low-pressure cylinder 8, a second low-pressure cylinder minimum cooling steam pipeline 18 is connected between the low-pressure cylinder steam extraction connecting pipe 22 and a steam inlet of the second low-pressure cylinder 10, 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; a low-pressure water supply connecting pipe 5 is connected between an outlet of a first condensate pump 11 and an 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.
Preferably, the intermediate pressure cylinder steam exhaust connecting pipe control and isolation valve group 3 is arranged on the intermediate pressure cylinder steam exhaust connecting pipe 4, so that the switching of the deep peak regulation operation mode of a single unit is realized;
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 system generator set 13, and the valve group can control the steam inlet amount of the first low pressure cylinder 8 and adjust the output force of the first low pressure cylinder 8 of the steam turbine;
preferably, a second intermediate pressure cylinder steam exhaust control and isolation valve group 2 is installed on a steam exhaust pipe of an intermediate pressure cylinder of the second conventional unit-system generator set 14, and the valve group can control the steam inlet amount of the second low pressure cylinder 10 and adjust the output force of the second low pressure cylinder 10 of the steam turbine;
preferably, the low-pressure cylinder steam extraction connecting pipe 22 is provided with a low-pressure cylinder steam extraction connecting pipe control and isolation valve group 21 for providing switching of minimum cooling steam of the first low-pressure cylinder 8 and the second low-pressure cylinder 10 in the deep peak shaving process;
preferably, a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 15 is installed on a first low-pressure cylinder minimum cooling steam pipeline 16 of the first conventional unit-system generator set 13, and the valve group 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, a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 17 is installed on a second low-pressure cylinder minimum cooling steam pipeline 18 of the second conventional unit-system generator set 14, and the valve group can maintain the minimum steam inlet quantity 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 an operation method of coupling peak shaving system based on well row and low pressure extraction cooling, including following step:
step 2, opening a medium pressure cylinder steam exhaust connecting pipe control and isolation valve group 3 of a medium pressure cylinder steam exhaust connecting pipe 4; a first low-pressure cylinder minimum cooling steam pipeline control and isolation valve group 15 of the first conventional unit generator set 13 is opened; a low-pressure cylinder steam extraction connecting pipe control and isolation valve group 21 of the low-pressure cylinder steam extraction connecting pipe 22 is opened; the first intermediate pressure cylinder steam exhaust control and isolation valve group 1 of the first conventional unit system generator set 13 is slowly closed; the low-pressure water supply connecting pipe control and isolation valve group 6 of the low-pressure water supply connecting pipe 5 is slowly opened; maintaining the water level of the deaerator of the first conventional unit generator set 13 to be stable; the deep peak regulation operation of the first conventional unit generator set 13 is realized;
step 3, 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 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 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; 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 intermediate pressure cylinder steam exhaust control and isolation valve group 2 is slowly closed; the low-pressure water supply connecting pipe 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 (9)
1. The coupling peak shaving system based on medium-exhaust and low-pressure extraction cooling is characterized by comprising a first conventional unit generating set (13) and a second conventional unit generating set (14);
the first conventional unit system generator set (13) comprises a first intermediate pressure cylinder (7), a first low pressure cylinder (8), a first condensate pump (11), a first low pressure cylinder steam extraction pipe (19) and a first intermediate pressure cylinder steam exhaust control and isolation valve group (1), and the second conventional unit system generator set (14) comprises a second intermediate pressure cylinder (9), a second low pressure cylinder (10), a second condensate pump (12), a second low pressure cylinder steam extraction pipe (20) and a second intermediate pressure cylinder steam exhaust control and isolation valve group (2);
an 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 an 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);
a 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 a 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);
a low-pressure cylinder steam extraction connecting pipe (22) is connected between a first low-pressure cylinder steam extraction pipe (19) and a second low-pressure cylinder steam extraction pipe (20) of the two turbines, and a low-pressure cylinder steam extraction connecting pipe control and isolation valve group (21) is installed on the low-pressure cylinder steam extraction connecting pipe (22);
a first low-pressure cylinder minimum cooling steam pipeline (16) is connected between the low-pressure cylinder steam extraction connecting pipe (22) and a steam inlet of the first low-pressure cylinder (8), a second low-pressure cylinder minimum cooling steam pipeline (18) is connected between the low-pressure cylinder steam extraction connecting pipe (22) and a steam inlet of the second low-pressure cylinder (10), 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);
a low-pressure water supply connecting pipe (5) is connected between an outlet of a first condensate pump (11) and an 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).
2. The coupled peak shaving system based on middle-row and low-pressure extraction cooling as claimed in claim 1, wherein the first conventional unit generator set (13) and the second conventional unit generator set (14) have the same power generation capacity, equivalent capacity, and consistent equipment type and thermodynamic system design.
3. The coupled peak shaving system based on middle-exhaust and low-pressure extraction cooling according to claim 1, characterized in that the first conventional unit generator set (13) and the second conventional unit generator set (14) are in operation with both boilers and both turbines in operation.
4. The coupled peak shaving system based on middle-row and low-pressure extraction cooling as claimed in claim 1, characterized in that the exhaust steam of the first intermediate pressure cylinder (7) of the first conventional unit generator set (13) can enter the second low pressure cylinder (10) of the second conventional unit generator set (14) to do work through the intermediate pressure cylinder exhaust steam communication pipe (4).
5. The coupled peak shaving system based on middle-row and low-pressure extraction cooling as claimed in claim 1, characterized in that the second intermediate-pressure cylinder (9) exhaust of the second conventional unit generator set (14) can enter the first low-pressure cylinder (8) of the first conventional unit generator set (13) to do work through the intermediate-pressure cylinder exhaust connecting pipe (4).
6. The mid-row and low-pressure extraction cooling-based coupled peak shaving system according to claim 1, characterized in that the condensed water at the outlet of the first condensed water pump (11) of the first conventional unit generator set (13) enters the low-pressure water supply system of the second conventional unit generator set (14) through the low-pressure water supply communication pipe (5) to maintain the deaerator water level of the second conventional unit generator set (14) stable.
7. The mid-row and low-pressure extraction cooling-based coupled peak shaving system according to claim 1, wherein the outlet condensate water of the second condensate pump (12) of the second conventional unit generator set (14) enters the low-pressure feedwater system of the first conventional unit generator set (13) through the low-pressure feedwater connection pipe (5) to maintain the deaerator water level of the first conventional unit generator set (13) stable.
8. The coupled peak shaving system based on middle-exhaust and low-pressure steam extraction cooling as claimed in claim 1, wherein when the second intermediate-pressure cylinder steam extraction control and isolation valve group (2) of the second conventional unit generator set (14) is closed, the low-pressure cylinder steam extraction of the first conventional unit generator set (13) can enter the second low-pressure cylinder (10) to cool the low-pressure cylinder through the first low-pressure cylinder steam extraction pipe (19), the low-pressure cylinder steam extraction connecting pipe (22) and the second low-pressure cylinder minimum cooling steam pipeline (18), so as to ensure the safe operation of the second low-pressure cylinder (10).
9. The coupled peak shaving system based on middle-exhaust and low-pressure steam extraction cooling as claimed in claim 1, characterized in that when the first middle-pressure cylinder steam extraction control and isolation valve group (1) of the first conventional unit generator set (13) is closed, the low-pressure cylinder steam extraction of the second conventional unit generator set (14) can enter the first low-pressure cylinder (8) to cool the low-pressure cylinder through the second low-pressure cylinder steam extraction pipe (20), the low-pressure cylinder steam extraction connecting pipe (22) and the first low-pressure cylinder minimum cooling steam pipeline (16), so as to ensure the safe operation of the first low-pressure cylinder (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120567159.7U CN214464456U (en) | 2021-03-19 | 2021-03-19 | Coupling peak regulation system based on medium-pressure exhaust and low-pressure steam extraction cooling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120567159.7U CN214464456U (en) | 2021-03-19 | 2021-03-19 | Coupling peak regulation system based on medium-pressure exhaust and low-pressure steam extraction cooling |
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| CN214464456U true CN214464456U (en) | 2021-10-22 |
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| CN202120567159.7U Active CN214464456U (en) | 2021-03-19 | 2021-03-19 | Coupling peak regulation system based on medium-pressure exhaust and low-pressure steam extraction cooling |
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