CN113944922A - System for shortening starting time of gas-steam combined cycle generator set - Google Patents
System for shortening starting time of gas-steam combined cycle generator set Download PDFInfo
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- CN113944922A CN113944922A CN202111316316.8A CN202111316316A CN113944922A CN 113944922 A CN113944922 A CN 113944922A CN 202111316316 A CN202111316316 A CN 202111316316A CN 113944922 A CN113944922 A CN 113944922A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a system for shortening the starting time of a gas-steam combined cycle generator set, which comprises a high-pressure main steam pipe, a high-pressure steam bypass, an auxiliary heating steam pipe, a drain pipe and an auxiliary steam recovery pipe, wherein the high-pressure steam bypass is communicated with the high-pressure main steam pipe; steam turbine high pressure cylinder and exhaust-heat boiler are connected to high pressure main steam pipe, the high pressure steam bypass sets up at high pressure main steam pipe entry end, connect exhaust-heat boiler re-heater and high pressure main steam pipe, the setting of auxiliary heating steam pipe is at high pressure main steam pipe entry end, be located high pressure steam bypass low reaches, the drain pipe sets up the relief low point of the easy ponding of high pressure main steam pipe on the way, a condensate water for discharging in the high pressure main steam pipe, flow in high pressure main steam pipe with higher speed steam, the setting of auxiliary steam recovery tube is terminal at high pressure main steam pipe, be used for retrieving the auxiliary steam after the heat transfer with high pressure main steam pipe. The invention has the advantages of reducing the pollutant emission and the power generation cost in the starting process and improving the economic benefit of the unit.
Description
Technical Field
The invention relates to a starting method, in particular to a system for shortening the starting time of a gas-steam combined cycle generator set.
Background
The gas-steam combined cycle power generation technology is an advanced power generation technology and mainly comprises a gas turbine, a waste heat boiler and a steam turbine. The fuel is combusted with air compressed by the air compressor in the combustion chamber of the gas turbine to release heat energy to form high-temperature and high-pressure flue gas, the high-temperature and high-pressure flue gas is expanded by the gas turbine to do work and output shaft power to generate electricity, exhaust gas which does work is discharged into a waste heat boiler to heat water to generate high-pressure steam, and the high-pressure steam pushes the steam turbine to do work to further generate electricity, so that the cascade utilization of energy is realized. Compared with the traditional steam power generation system, the gas-steam combined cycle power generation system has the advantages of high power generation efficiency, wide load regulation range, good safety, high reliability, environmental protection and the like.
Due to the advantages, the gas-steam combined cycle generator set often participates in peak shaving operation of a power grid, the start and stop of the generator set are frequent, in the starting process, the gas turbine is fast to start and fast to adjust, and the waste heat boiler and the steam turbine are slow to start. This is mainly because during the starting process, due to the rapid change of the steam temperature and pressure, the steam drum material is subjected to a large mechanical stress due to the rapid pressure increase or pressure decrease, and a correspondingly large thermal stress is generated due to the rapid temperature increase and temperature decrease, so that when the stress exceeds the maximum allowable stress of the material and lasts for a long time, the equipment is damaged, the service life of the equipment is shortened, and the unit safety is endangered in a serious case.
During the starting process of the gas-steam combined cycle generator set, the gas-steam combined cycle generator set is limited by thermal stress and mechanical stress of a waste heat boiler steam drum, a steam turbine cylinder body and the like, the gas turbine needs to operate under a low-load working condition for a long time, and the load can be gradually increased after the waste heat boiler and the steam turbine are started. When the gas turbine operates under a load working condition, the proportion of fuel participating in diffusion combustion is large, but the temperature of a flame surface of the diffusion combustion is generally as high as more than 2000-2200 ℃, so that a large amount of NOx is generated, and a chimney emits yellow smoke for a long time in the starting process of a unit; in addition, the thermal performance of the gas turbine in the low-load working condition is far lower than the design performance of the rated working condition of the gas turbine, and the starting time of the gas-steam combined cycle is too long, so that the power generation cost is increased, and the economic performance of the combined cycle power generation is reduced.
Disclosure of Invention
The invention provides a system for shortening the starting time of a gas-steam combined cycle generator set, which aims to shorten the starting time of the gas-steam combined cycle generator set, reduce the NOx emission in the starting process of the gas-steam combined cycle generator set and reduce the power generation cost in the starting process of the generator set. The device for preheating the high-pressure main steam pipe by using the auxiliary steam before the unit is started is adopted, so that the temperature of the high-pressure main steam pipe reaches the temperature requirement of the main steam when the steam turbine is rushed to rotate in advance, the high-pressure main steam can be immediately conveyed to the high-pressure cylinder through the main steam pipe to impact the high-pressure rotor to expand and do work after the temperature of the main steam generated by the waste heat boiler reaches the temperature requirement of the steam turbine, the problem of temperature reduction of the high-pressure main steam after passing through the main steam pipe is not needed to be considered, the starting time of the unit is further shortened, and the generation amount of pollutants and the power generation cost in the starting process are reduced; in addition, the method for preserving heat of the high-pressure main steam pipe is adopted, so that the heat dissipation of the main steam pipe to the external environment after the shutdown of the gas-steam combined cycle unit is slowed down, the wall temperature of the high-pressure main steam pipe when the unit is started next time is increased, the heating amount of auxiliary steam is reduced, and the power generation cost is further reduced.
The invention is realized by adopting the following technical scheme:
a system for shortening the starting time of a gas-steam combined cycle generator set comprises a high-pressure main steam pipe, a high-pressure steam bypass, an auxiliary heating steam pipe, a drain pipe and an auxiliary steam recovery pipe;
steam turbine high pressure cylinder and exhaust-heat boiler are connected to high pressure main steam pipe, the high pressure steam bypass sets up at high pressure main steam pipe entry end, connect exhaust-heat boiler re-heater and high pressure main steam pipe, the setting of auxiliary heating steam pipe is at high pressure main steam pipe entry end, be located high pressure steam bypass low reaches, the drain pipe sets up the relief low point of the easy ponding of high pressure main steam pipe on the way, a condensate water for discharging in the high pressure main steam pipe, flow in high pressure main steam pipe with higher speed steam, the setting of auxiliary steam recovery tube is terminal at high pressure main steam pipe, be used for retrieving the auxiliary steam after the heat transfer with high pressure main steam pipe.
The invention is further improved in that the high-pressure main steam pipe is wrapped with an insulating layer.
The invention is further improved in that a main steam regulating valve is arranged on the high-pressure main steam pipe and used for controlling the steam flow direction.
The invention is further improved in that a high-pressure cylinder steam inlet regulating valve is arranged on the high-pressure main steam pipe and used for regulating the steam flow, and an auxiliary steam recovery pipe is positioned at the upstream of the high-pressure cylinder steam inlet regulating valve.
The invention is further improved in that a bypass regulating valve is arranged on the high-pressure steam bypass.
The invention is further improved in that an auxiliary heating steam regulating valve is arranged on the auxiliary heating steam pipe.
The invention is further improved in that a drain pipe regulating valve is arranged on the drain pipe.
The invention is further improved in that an auxiliary steam recovery regulating valve is arranged on the auxiliary steam recovery pipe.
The invention has at least the following beneficial technical effects:
the invention provides a system for shortening the starting time of a gas-steam combined cycle generator set, which adopts a method that auxiliary steam preheats a high-pressure main steam pipe in advance and adopts a heat-insulating layer to reduce the heat radiation of the high-pressure main steam pipe.
Drawings
FIG. 1 is a schematic diagram of a system for reducing start-up time of a gas-steam combined cycle power plant in accordance with the present invention.
Description of reference numerals:
1. a high pressure main steam pipe; 2. a high pressure steam bypass; 3. auxiliary heating of the steam pipe; 4. a drain pipe; 5. an auxiliary steam recovery pipe; 6. a heat-insulating layer; 7. a bypass regulating valve; 8. a main steam regulating valve; 9. auxiliary heating steam regulating valve; 10. a drain pipe regulating valve; 11. an auxiliary steam recovery regulating valve; 12. high-pressure cylinder admission governing valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, the system for shortening the start-up time of a gas-steam combined cycle generator set provided by the invention comprises a high-pressure main steam pipe 1, a high-pressure steam bypass 2, an auxiliary heating steam pipe 3, a drain pipe 4, an auxiliary steam recovery pipe 5, a heat insulation layer 6, a bypass regulating valve 7, a main steam regulating valve 8, an auxiliary heating steam regulating valve 9, a drain pipe regulating valve 10, an auxiliary steam recovery regulating valve 11 and a high-pressure cylinder steam inlet regulating valve 12.
Referring to fig. 1, in the embodiment, a high-pressure main steam pipe 1 is connected to a high-pressure cylinder of a steam turbine and a waste heat boiler, and an insulating layer 6 is wrapped outside the high-pressure main steam pipe 1, so that heat dissipation loss of the high-pressure main steam pipe 1 to the external environment can be reduced. The high-pressure steam bypass 2 is arranged at the inlet end of the high-pressure main steam pipe 1 and connected with the waste heat boiler reheater and the high-pressure main steam pipe 1, and when the high-pressure steam parameters do not meet the steam turbine running requirement, high-pressure steam generated by the waste heat boiler returns to the waste heat boiler reheater through the high-pressure steam bypass 2. The auxiliary heating steam pipe 3 is arranged at the inlet end of the high-pressure main steam pipe 1 and is positioned at the downstream of the high-pressure steam bypass 2, and auxiliary steam can be introduced in advance to heat the high-pressure main steam pipe 1 before the unit is started, so that the starting time is shortened. The drain pipe 4 is arranged at a low point of the terrain where water is easy to accumulate along the high-pressure main steam pipe 1, and is used for discharging condensed water in the high-pressure main steam pipe 1 and accelerating the flow of steam in the high-pressure main steam pipe 1. The auxiliary steam recovery pipe 5 is arranged at the tail end of the high-pressure main steam pipe 1, is positioned at the upstream of the high-pressure cylinder steam inlet regulating valve 12, and is used for recovering the auxiliary steam after heat exchange with the high-pressure main steam pipe 1. The bypass regulating valve 7, the auxiliary heating steam regulating valve 9, the drain pipe regulating valve 10 and the auxiliary steam recovery regulating valve 11 are respectively arranged on the high-pressure steam bypass 2, the auxiliary heating steam pipe 3, the drain pipe 4 and the auxiliary steam recovery pipe 5, and the main steam regulating valve 8 and the high-pressure cylinder steam inlet regulating valve 12 are arranged on the high-pressure main steam pipe 1 and used for controlling the steam flow direction and regulating the steam flow.
The specific working mode of the system for shortening the starting time of the gas-steam combined cycle generator set is as follows:
before the gas-steam combined cycle generator set is started, the bypass regulating valve 7, the main steam regulating valve 8 and the high-pressure cylinder steam inlet regulating valve 12 are closed, the auxiliary heating steam regulating valve 9 and the auxiliary steam recovery regulating valve 11 are opened, auxiliary steam enters the high-pressure main steam pipe 1 from the auxiliary heating steam pipe 3, and exhaust steam after heating the high-pressure main steam pipe 1 returns to the auxiliary steam heating system through the auxiliary steam recovery pipe 5 to be reheated; in the auxiliary steam heating process, according to the level of condensed water at the drainage point of the high-pressure main steam pipe 1, opening the drainage pipe regulating valve 10 in time to discharge the condensed water in the high-pressure main steam pipe 1 and accelerate the flow of the auxiliary steam in the high-pressure main steam pipe 1; when the wall temperature of the high-pressure main steam pipe 1 reaches the requirement of the steam turbine on the main steam temperature, gradually closing the opening of the auxiliary heating steam regulating valve 9, and simultaneously starting the gas turbine and the waste heat boiler; when the temperature and the pressure of high-pressure main steam generated by the waste heat boiler do not meet the turbine run-out requirement, a bypass regulating valve 7 is opened, and the high-pressure main steam generated by the waste heat boiler returns to a waste heat boiler reheater through a high-pressure steam bypass 2 to be continuously heated; when the temperature and the pressure of high-pressure main steam generated by the waste heat boiler meet the requirement of turbine running, the bypass regulating valve 7 is closed, the auxiliary heating steam regulating valve 9 and the auxiliary steam recovery regulating valve 11 are opened, the main steam regulating valve 8 and the high-pressure cylinder steam inlet regulating valve 12 are opened, main steam generated by the waste heat boiler quickly enters a turbine high-pressure cylinder through the high-pressure main steam pipe 1 to run and do work on a turbine rotor, the starting speed of the waste heat boiler and the turbine is accelerated, the starting time of the gas-steam combined cycle generator set is shortened, pollutant emission and power generation cost in the starting process of the unit are reduced, and the economy and the environmental friendliness of the unit during starting are improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention.
Claims (8)
1. A system for shortening the starting time of a gas-steam combined cycle generator set is characterized by comprising a high-pressure main steam pipe (1), a high-pressure steam bypass (2), an auxiliary heating steam pipe (3), a drain pipe (4) and an auxiliary steam recovery pipe (5);
high-pressure main steam pipe (1) is connected steam turbine high-pressure cylinder and exhaust-heat boiler, high-pressure steam bypass (2) set up at high-pressure main steam pipe (1) entry end, connect exhaust-heat boiler reheater and high-pressure main steam pipe (1), auxiliary heating steam pipe (3) set up at high-pressure main steam pipe (1) entry end, be located high-pressure steam bypass (2) low reaches, drain pipe (4) set up the relief low point of the easy ponding of high-pressure main steam pipe (1) on journey, a comdenstion water for discharging in the high-pressure main steam pipe (1), the flow of steam in high-pressure main steam pipe (1) is accelerated, auxiliary steam recovery tube (5) set up at high-pressure main steam pipe (1) end, be used for retrieving the auxiliary steam after the heat transfer with high-pressure main steam pipe (1).
2. The system for shortening the starting time of the gas-steam combined cycle generator set according to claim 1, wherein the high-pressure main steam pipe (1) is externally wrapped with an insulating layer (6).
3. The system for shortening the start-up time of a gas-steam combined cycle power plant according to claim 1, wherein the high pressure main steam pipe (1) is provided with a main steam regulating valve (8) for controlling the steam flow direction.
4. The system for shortening the start-up time of a gas-steam combined cycle generator set according to claim 1, wherein the high pressure main steam pipe (1) is provided with a high pressure cylinder steam inlet regulating valve (12) for regulating the steam flow, and the auxiliary steam recovery pipe (5) is located upstream of the high pressure cylinder steam inlet regulating valve (12).
5. The system for shortening the starting time of the gas-steam combined cycle generator set according to claim 1, wherein a bypass regulating valve (7) is installed on the high-pressure steam bypass (2).
6. The system for shortening the start-up time of a gas-steam combined cycle power plant according to claim 1, wherein the auxiliary heating steam pipe (3) is provided with an auxiliary heating steam regulating valve (9).
7. The system for shortening the starting time of the gas-steam combined cycle generator set according to claim 1, wherein a drain pipe regulating valve (10) is installed on the drain pipe (4).
8. The system for shortening the start-up time of a gas-steam combined cycle power plant according to claim 1, wherein an auxiliary steam recovery regulating valve (11) is installed on the auxiliary steam recovery pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316316.8A CN113944922A (en) | 2021-11-08 | 2021-11-08 | System for shortening starting time of gas-steam combined cycle generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111316316.8A CN113944922A (en) | 2021-11-08 | 2021-11-08 | System for shortening starting time of gas-steam combined cycle generator set |
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| Publication Number | Publication Date |
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| CN113944922A true CN113944922A (en) | 2022-01-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111316316.8A Pending CN113944922A (en) | 2021-11-08 | 2021-11-08 | System for shortening starting time of gas-steam combined cycle generator set |
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| CN (1) | CN113944922A (en) |
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2021
- 2021-11-08 CN CN202111316316.8A patent/CN113944922A/en active Pending
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