CN212511103U - Shutdown waste heat utilization device of gas-steam combined cycle unit - Google Patents
Shutdown waste heat utilization device of gas-steam combined cycle unit Download PDFInfo
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- CN212511103U CN212511103U CN202021027002.7U CN202021027002U CN212511103U CN 212511103 U CN212511103 U CN 212511103U CN 202021027002 U CN202021027002 U CN 202021027002U CN 212511103 U CN212511103 U CN 212511103U
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Abstract
The utility model discloses a gas-steam combined cycle unit shutdown waste heat utilization equipment, it is including high-pressure steam pocket (1), the high-pressure steam outlet of high-pressure steam pocket (1) is through pipe connection to middling pressure steam pocket (2), and the exit linkage middling pressure over heater (3) of middling pressure steam pocket (2) import, and middling pressure over heater (3) exit linkage middling pressure steam electric isolation door (4) import, and middling pressure steam electric isolation door (4) exit linkage to middling pressure bypass, the exit of middling pressure steam electric isolation door (4) still is equipped with the pipeline that is connected to gas-distributing cylinder (5). The utility model discloses can use at the in-process of shutting down, can improve the waste heat utilization ratio who shuts down with the high pressure and the outside heat supply of middling pressure superheated steam of originally discharging to the condenser in the process of shutting down, the waste heat utilization success rate is more than 99%, reduces to shut down the gas consumption, improves the economic benefits who shuts down.
Description
Technical Field
The utility model relates to a power plant's electricity generation technical field especially relates to a waste heat utilization equipment of F level gas-steam combined cycle peak shaving unit suitable for there is hot user.
Background
With the large-scale grid connection of new energy such as wind power, photovoltaic, hydropower and the like, the low valley load is slowly increased, the power consumption peak-valley difference is increased year by year, the demand of a power grid on the peak regulation of a generator set is increased day by day, in order to relieve the problem of difficult peak regulation, power grids in various places are successively built to operate a power peak regulation auxiliary service market, the peak regulation capability of the generator set is fully developed by means of a marketization mechanism, the peak regulation capability of a peak regulation gas turbine power plant in the grid is encouraged to be fully exerted, and how to improve the peak regulation economic benefit becomes a focus of increasing the income and. S109FA the gas-steam combined cycle unit has the characteristic of rapid shutdown, in the shutdown process, along with the reduction of the load of the combined cycle unit, the power ratio of steam and gas is in a rapid descending trend, a large amount of exhaust energy of the gas turbine heats the waste heat boiler to generate a large amount of superheated steam, because the shutdown of the combined cycle unit is to shutdown the steam turbine firstly, the superheated steam does not enter the steam turbine to do work and is discharged to the condenser from a bypass, and a large amount of exhaust energy of the gas turbine is not completely converted into the power of the steam turbine. When the power of the combined cycle unit is 320 MW, the ratio of the steam to the fuel gas power is nearly 50%; when the combined cycle power is 240 MW, the steam to gas power ratio is reduced to 30%; at 80 MW combined cycle power, the steam to gas power ratio is only 15%. The gas turbine continuously discharges a large amount of gas heat to enter a waste heat boiler flue to heat water and steam before flameout, during the shutdown process of a steam turbine unit in the combined cycle unit, the steam inlet volume of the steam turbine for acting is rapidly reduced, a large amount of superheated steam is directly discharged to a condenser through a bypass, the waste heat in the shutdown process cannot be fully utilized, on one hand, the load of the condenser is increased, and on the other hand, steam heat loss is caused. The waste heat boiler of the S109FA gas-steam combined cycle unit has the characteristics of strong heat storage capacity, high waste heat recovery rate and large steam drum volume, but no device and application case for efficiently utilizing the waste heat in the shutdown process of the unit are available in China at present.
For these reasons, it is necessary to find a way to utilize the waste heat from the shutdown process to reduce the steam heat loss during the shutdown process.
Disclosure of Invention
The utility model aims at providing a can be in the shutdown process with originally arrange the high pressure and the outside heat supply of middling pressure superheated steam to the condenser, improve the gas-steam combined cycle unit waste heat utilization equipment of the waste heat utilization ratio who shuts down to the not enough of above-mentioned prior art.
The utility model adopts the technical scheme as follows:
the waste heat utilization device of the gas-steam combined cycle unit is characterized by comprising a high-pressure steam drum, wherein a high-pressure steam outlet of the high-pressure steam drum is connected to a medium-pressure steam drum through a pipeline and a control valve, an outlet of the medium-pressure steam drum is connected with an inlet of a medium-pressure superheater, an outlet of the medium-pressure superheater is connected with an inlet of a medium-pressure steam electric isolating door, an outlet of the medium-pressure steam electric isolating door is connected to a medium-pressure bypass, and a pipeline connected to a branch cylinder is further arranged at an outlet of the medium-pressure steam electric isolating.
The outlet of the medium-pressure steam electric isolating door is connected to a pipeline of the steam distributing cylinder, and a medium-pressure auxiliary steam pneumatic stop door, a medium-pressure auxiliary steam supply check door, a medium-pressure auxiliary steam pneumatic adjusting door and an auxiliary steam electric isolating door are sequentially arranged on the pipeline.
And a pipeline between the auxiliary steam electric isolating door and the steam distributing cylinder is provided with a heat supply electric isolating door of the steam distributing cylinder.
Two branches which are arranged in parallel are arranged between the auxiliary steam electric isolating door and the heat supply to steam distributing cylinder electric isolating door, one branch is sequentially provided with a gas turbine auxiliary electric door front manual door and a gas turbine heat supply electric isolating door, and the other branch is sequentially provided with a heat supply pressurizing primary door and a heat supply pressurizing secondary door.
And a high-pressure steam outlet of the high-pressure steam drum is connected to a pipeline of the medium-pressure steam drum, and a steam-supplementing electric isolating door and a steam-supplementing pneumatic adjusting door are sequentially arranged on the pipeline.
A branch pipeline is arranged between the medium-pressure auxiliary steam supply check valve and the medium-pressure auxiliary steam supply pneumatic adjusting valve, and a medium-pressure auxiliary steam pipeline drainage pneumatic valve is arranged on the branch pipeline.
And a branch pipeline is also arranged on a pipeline from the auxiliary steam electric isolating door to the two branches arranged in parallel, and a gas turbine heat supply electric door front drainage pneumatic door is arranged on the branch pipeline.
Two branch pipelines are further arranged between the two branches which are arranged in parallel and the electric isolating door for supplying heat to the gas-distributing cylinder, and a gas turbine heat supply electric door rear drainage pneumatic door and a heat supply electric door front drainage pneumatic door are respectively arranged on the two branch pipelines.
A branch pipeline is further arranged between the heat supply and branch cylinder electric isolation door and the branch cylinder, and a heat supply and branch cylinder electric door rear drainage pneumatic door is arranged on the branch pipeline.
The beneficial effects of the utility model are that:
the utility model discloses can use at the in-process of shutting down, can improve the waste heat utilization ratio who shuts down with the high pressure and the outside heat supply of middling pressure superheated steam of originally discharging to the condenser in the process of shutting down, the waste heat utilization success rate is more than 99%, reduces to shut down the gas consumption, improves the economic benefits who shuts down.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1, a high-pressure steam pocket; 2. a medium pressure steam drum; 3. a medium pressure superheater; 4. a medium pressure steam electric isolation door; 5. a cylinder is divided; 6. a manual door in front of the auxiliary electric door of the gas turbine; 7. an electric isolation door for supplying auxiliary steam at medium pressure; 8. the gas turbine supplies heat to the electronic isolating gate; 9. heat is supplied to the electric isolating door of the branch cylinder; 10. a medium-pressure auxiliary steam supply pneumatic adjusting door; 11. a medium pressure auxiliary steam supply check valve; 12. the medium pressure supplies the pneumatic stop gate of auxiliary steam; 13. an air-supplementing electric isolation door; 14. a pneumatic regulating valve for steam supply; 15. a high pressure evaporator; 16. a medium pressure evaporator; 17. a heating and pressurizing primary door; 18. a heating and pressurizing secondary door; 19. a medium-pressure auxiliary steam pipeline drainage pneumatic door; 20. a water draining pneumatic door in front of a heat supply electric door of the gas turbine; 21. a gas turbine heat supply electric door rear drainage pneumatic door; 22. heat is supplied to the front water drainage pneumatic door of the electric door of the steam distributing cylinder; 23. heat is supplied to the rear water drainage pneumatic door of the steam distributing cylinder electric door.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, the utility model discloses it is including it including high-pressure steam pocket 1, high-pressure steam outlet of high-pressure steam pocket 1 passes through pipe connection to middling pressure steam pocket 2, middling pressure steam pocket 2's exit linkage middling pressure over heater 3 import, and 3 exit linkage middling pressure steam electric isolation door 4 imports of middling pressure over heater, and middling pressure steam electric isolation door 4 exit linkage to middling pressure bypass, and the exit of middling pressure steam electric isolation door 4 still is equipped with the pipeline that is connected to branch cylinder 5.
The outlet of the medium-pressure steam electric isolating door 4 is connected to the pipeline of the steam distributing cylinder 5, and is sequentially provided with a medium-pressure steam supply auxiliary steam pneumatic stop valve 12, a medium-pressure steam supply auxiliary steam check valve 11, a medium-pressure steam supply auxiliary steam pneumatic adjusting valve 10 and an auxiliary steam electric isolating door 7. And a pipeline between the auxiliary steam electric isolating door 7 and the steam distributing cylinder 5 is provided with a heat supply to steam distributing cylinder electric isolating door 9. Two branches which are arranged in parallel are arranged between the auxiliary steam electric isolating door 7 and the heat supply to steam distributing cylinder electric isolating door 9, wherein one branch is sequentially provided with a gas turbine auxiliary electric door front manual door 6 and a gas turbine heat supply electric isolating door 8, and the other branch is sequentially provided with a heat supply pressurizing primary door 17 and a heat supply pressurizing secondary door 18.
The utility model discloses middling pressure supplies supplementary steam check valve 11 and middling pressure to supply to be equipped with a branch road pipeline between the pneumatic regulating gate 10 of supplementary steam, is equipped with the hydrophobic pneumatic door 19 of middling pressure supplementary steam pipe way on this branch road pipeline. A branch pipeline is further arranged on a pipeline between the auxiliary steam electric isolating door 7 and the two branches arranged in parallel, and a front water drainage pneumatic door 20 of the gas turbine heat supply electric door is arranged on the branch pipeline. Two branch pipelines are further arranged between the two branches which are arranged in parallel and the electric isolating door 9 for supplying heat to the gas-distributing cylinder, and a rear drain pneumatic door 21 of the gas turbine heat supply electric door and a front drain pneumatic door 22 of the electric isolating door for supplying heat to the gas-distributing cylinder are respectively arranged on the two branch pipelines. A branch pipeline is also arranged between the heat supply and branch cylinder electric isolating door 9 and the branch cylinder 5, and a heat supply and branch cylinder electric door rear drainage pneumatic door 23 is arranged on the branch pipeline.
The utility model discloses high pressure steam pocket 1, middling pressure steam pocket 2 are connected high pressure evaporimeter 15 and middling pressure evaporimeter 16 respectively. A high-pressure steam outlet of the high-pressure steam drum 1 is connected to a pipeline of the medium-pressure steam drum 2, and a steam-supplementing electric isolating door 13 and a steam-supplementing pneumatic adjusting door 14 are sequentially arranged on the pipeline and are used as control devices for adjusting the steam supplementing quantity from the high-pressure steam drum 1 to the medium-pressure steam drum 2 and maintaining the pressure of the medium-pressure steam drum 2. The medium-pressure steam drum 2 is connected with a medium-pressure superheater 3, and the medium-pressure superheater 3 heats saturated steam in the medium-pressure steam drum 2 into superheated steam with a certain temperature. The high pressure steam drum 1 stores high pressure steam, the medium pressure steam drum 2 stores medium pressure steam, the high pressure evaporator 15 mainly exchanges heat with the high pressure steam drum 1, and the medium pressure evaporator 16 mainly exchanges heat with the medium pressure steam drum 2.
The utility model discloses the electronic isolation door of middling pressure steam 4 plays isolated effect for middling pressure steam user stops to use vapour. The medium-pressure auxiliary steam supply pneumatic stop valve 12, the medium-pressure auxiliary steam supply pneumatic adjusting valve 10 and the medium-pressure auxiliary steam supply check valve 11 are control adjusting devices for the heat supply pressure of an auxiliary steam main pipe, the heat supply pressure is adjusted, and the heat supply flow is controlled. The auxiliary steam electric isolating door 7, the combustion engine heat supply electric isolating door 8 and the combustion engine auxiliary electric door front manual door 6 are isolating devices for stopping heat supply, and play an effective and reliable isolating role when stopping heat supply. The heat supply pressurizing primary door 17 and the heat supply pressurizing secondary door 18 play a role of heating pipes of the heat supply pipeline by utilizing waste heat of the combustion engine. The heat supply to the steam distributing cylinder electric isolation door 9 plays a role in isolating the steam distributing cylinder 5 when a heat supply pipeline for utilizing waste heat of a gas turbine is overhauled, and the medium-pressure auxiliary steam pipeline drainage pneumatic door 19, the front drainage pneumatic door 20 of the heat supply electric door of the gas turbine, the rear drainage pneumatic door 21 of the heat supply electric door of the gas turbine, the front drainage pneumatic door 22 of the heat supply to the steam distributing cylinder electric door and the rear drainage pneumatic door 23 of the heat supply to the steam distributing cylinder electric door play a role in draining the heat supply pipeline for utilizing the waste heat.
The working process of the utility model is as follows:
before the machine is stopped, the medium-pressure steam electric isolating door 4 is in a normally open state, a medium-pressure auxiliary steam pipeline drainage pneumatic door 19, a gas turbine heat supply electric door front drainage pneumatic door 20, a gas turbine heat supply electric door rear drainage pneumatic door 21, a heat supply to gas-distributing cylinder electric door front drainage pneumatic door 22 and a heat supply to gas-distributing cylinder electric door rear drainage pneumatic door 23 are opened, a heat supply to gas-distributing cylinder electric isolating door 9, a medium-pressure auxiliary steam supply electric isolating door 7 and a medium-pressure auxiliary steam supply pneumatic stop door 12 are opened, a heat supply pressurizing primary door 17 and a heat supply pressurizing secondary door 18 are opened, a medium-pressure auxiliary steam supply pneumatic adjusting door 10 is slightly opened, and waste heat utilization heat supply pipeline heating pipe boosting is carried out. After the pressure rise of the heating pipe is finished, the front manual door 6 of the gas turbine heat supply electric door and the gas turbine heat supply electric isolating door 8 are opened, and the heat supply pressurizing primary door 17, the heat supply pressurizing secondary door 18, the front drainage pneumatic door 20 of the gas turbine heat supply electric door, the rear drainage pneumatic door 21 of the gas turbine heat supply electric door, the front drainage pneumatic door 22 of the heat supply to gas distribution cylinder electric door and the rear drainage pneumatic door 23 of the heat supply to gas distribution cylinder electric door are closed.
In the shutdown process, the medium-pressure steam electric isolating door 4, the medium-pressure auxiliary steam supply pneumatic stop door 12, the medium-pressure auxiliary steam supply electric isolating door 7, the manual door 6 in front of the gas turbine auxiliary electric door, the gas turbine heat supply electric isolating door 8 and the heat supply to steam-distributing cylinder electric isolating door 9 are kept in a fully open state, the high-pressure steam bypass regulating door is timely closed or even closed, the steam quantity discharged into a condenser is reduced, high-pressure saturated steam (the temperature grade is 300 ℃ and the pressure is 8 MPa) is supplemented into a medium-pressure steam pocket 2 (the temperature is 220 ℃ and the pressure is 2.3 MPa) through a high-pressure steam pocket steam supplementing pipe and a medium-pressure steam pocket steam supplementing pipe, then the steam is supplied into an auxiliary steam main pipe through a connecting pipeline of the medium-pressure superheater 3 and the auxiliary steam main pipe, and the auxiliary steam main; the steam (the temperature is 300 ℃ and the pressure is 2.2 MPa) at the outlet of the medium-pressure superheater 3 is controlled by closing or even closing the medium-pressure bypass regulating valve, the pressure of a heat supply pipeline is regulated to be 1.2 MPa by the medium-pressure supply auxiliary steam regulating valve 10, and meanwhile, the pressure of the medium-pressure steam drum 2 is maintained to be 2.3 MPa by the steam supplementing regulating valve from the high-pressure steam drum 1 to the medium-pressure steam drum 2, so that the steam which is directly discharged to the gas condenser in the shutdown process can continuously and stably supply heat to the outside.
Other parts which are not described in the present invention are the same as those in the prior art.
Claims (9)
1. The utility model provides a gas-steam combined cycle unit stop waste heat utilization equipment, its characterized in that is including high-pressure steam pocket (1), the high-pressure steam outlet of high-pressure steam pocket (1) is connected to middling pressure steam pocket (2) through pipeline and control flap, and the exit linkage middling pressure over heater (3) import of middling pressure steam pocket (2), and middling pressure over heater (3) exit linkage middling pressure steam electric isolating door (4) import, and middling pressure steam electric isolating door (4) exit linkage to middling pressure bypass, the exit of middling pressure steam electric isolating door (4) still is equipped with the pipeline that is connected to gas-distributing cylinder (5).
2. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 1, wherein a medium-pressure auxiliary steam pneumatic stop valve (12), a medium-pressure auxiliary steam check valve (11), a medium-pressure auxiliary steam pneumatic adjusting valve (10) and an auxiliary steam electric isolating valve (7) are sequentially arranged on a pipeline connecting an outlet of the medium-pressure steam electric isolating valve (4) to the steam distributing cylinder (5).
3. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 2, wherein the pipeline between the auxiliary steam electric isolation door (7) and the steam-distributing cylinder (5) is provided with a heat supply to the steam-distributing cylinder electric isolation door (9).
4. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 3, wherein two branches are arranged in parallel between the auxiliary steam electric isolation door (7) and the heat supply to steam distribution cylinder electric isolation door (9), one branch is sequentially provided with a gas turbine auxiliary electric door front manual door (6) and a gas turbine heat supply electric isolation door (8), and the other branch is sequentially provided with a heat supply and pressure charging primary door (17) and a heat supply and pressure charging secondary door (18).
5. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 1, wherein a high-pressure steam outlet of the high-pressure steam drum (1) is connected to a pipeline of the medium-pressure steam drum (2) and is sequentially provided with a steam-supplementing electric isolation door (13) and a steam-supplementing pneumatic adjusting door (14).
6. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 2, wherein a branch pipeline is arranged between the medium-pressure auxiliary steam supply check valve (11) and the medium-pressure auxiliary steam supply pneumatic adjusting valve (10), and a medium-pressure auxiliary steam pipeline drainage pneumatic valve (19) is arranged on the branch pipeline.
7. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 4, wherein a branch pipeline is further arranged on a pipeline from the auxiliary steam electric isolation door (7) to the two branches arranged in parallel, and a gas turbine heat supply electric door front drainage pneumatic door (20) is arranged on the branch pipeline.
8. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 4, wherein two branch pipelines are further arranged between the two branches arranged in parallel and the heat supply to steam-splitting cylinder electric isolating door (9), and a gas turbine heat supply electric door rear drain pneumatic door (21) and a heat supply to steam-splitting cylinder electric door front drain pneumatic door (22) are respectively arranged on the two branch pipelines.
9. The shutdown waste heat utilization device of the gas-steam combined cycle unit as claimed in claim 8, wherein a branch pipeline is further arranged between the heat supply branch cylinder electric isolating door (9) and the branch cylinder (5), and a rear drain pneumatic door (23) of the heat supply branch cylinder electric isolating door is arranged on the branch pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021027002.7U CN212511103U (en) | 2020-06-08 | 2020-06-08 | Shutdown waste heat utilization device of gas-steam combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021027002.7U CN212511103U (en) | 2020-06-08 | 2020-06-08 | Shutdown waste heat utilization device of gas-steam combined cycle unit |
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| Publication Number | Publication Date |
|---|---|
| CN212511103U true CN212511103U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021027002.7U Expired - Fee Related CN212511103U (en) | 2020-06-08 | 2020-06-08 | Shutdown waste heat utilization device of gas-steam combined cycle unit |
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| CN (1) | CN212511103U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466827A (en) * | 2022-08-29 | 2022-12-13 | 武汉钢铁有限公司 | Double-plant three-unit combined heat storage RH vacuum refining steam system |
-
2020
- 2020-06-08 CN CN202021027002.7U patent/CN212511103U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466827A (en) * | 2022-08-29 | 2022-12-13 | 武汉钢铁有限公司 | Double-plant three-unit combined heat storage RH vacuum refining steam system |
| CN115466827B (en) * | 2022-08-29 | 2023-08-18 | 武汉钢铁有限公司 | Double-factory three-unit combined heat storage RH vacuum refining steam system |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210209 |