CN215566267U - Auxiliary steam self-supply system of gas-steam combined cycle unit - Google Patents
Auxiliary steam self-supply system of gas-steam combined cycle unit Download PDFInfo
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- CN215566267U CN215566267U CN202120374524.2U CN202120374524U CN215566267U CN 215566267 U CN215566267 U CN 215566267U CN 202120374524 U CN202120374524 U CN 202120374524U CN 215566267 U CN215566267 U CN 215566267U
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Abstract
The utility model discloses an auxiliary steam self-supply system of a gas-steam combined cycle unit, which comprises: high-pressure steam pocket, middling pressure steam pocket, steam supply pipeline, middling pressure superheated steam export header and auxiliary steam system, the high-pressure steam pocket passes through steam supply pipeline connection middling pressure steam pocket, the middling pressure steam pocket is through supplying steam pipeline connection middling pressure superheated steam export header and auxiliary steam system. The utility model provides a method for modifying the shaft seal pressure in the starting stage and before the steam enters the steam turbine in the auxiliary steam self-supply process, so that the high-quality steam consumption consumed by the supply of the shaft seal steam is reduced as much as possible on the premise of ensuring the safety of a unit; meanwhile, in order to prevent abnormalities such as sudden CV closing and medium-pressure steam drum overpressure possibly caused in the auxiliary steam self-supply process, protection logics are set for a high-pressure to medium-pressure steam-supplementing electric valve and a high-pressure to medium-pressure steam-supplementing regulating valve related to auxiliary steam self-supply.
Description
Technical Field
The utility model relates to the field of power generation of power plants, in particular to an auxiliary steam self-supply system of a gas-steam combined cycle unit.
Background
In the application number: CN201911039584.2 is referred to in the patent application documents: with the change of the electricity utilization structure in China, the peak-valley difference of a power grid is gradually increased, and in order to ensure the stability of a power system, the gas-steam combined cycle system is high in starting and stopping speed and economical efficiency and can be used as a peak shaving unit to participate in the operation of the power grid, and meanwhile, in order to improve the energy utilization efficiency, the gas-steam combined cycle system adopts an energy supply mode of cogeneration.
Currently 9FA gas-steam combined cycle units require auxiliary steam to be supplied by the start-up boiler before start-up. After a boiler system is transformed to a certain extent, the residual steam after the stop of the waste heat boiler can be utilized to carry out the self-supply of the auxiliary steam, but except the transformation of equipment, the original starting and stopping operation method is difficult to adapt to the higher steam quality requirement required by the self-supply of the auxiliary steam. The heat preservation and pressure maintaining of the waste heat boiler are not fully considered in the shutdown process of the unit. The heat preservation and pressure maintaining effects of the waste heat boiler actually influence the load loading speed when the unit is restarted and determine the success rate of the unit for assisting steam self-supply. The original shutdown operation needs to wait for the loss of trip oil of the unit, then the unit bypass system is stopped, and vacuum is broken. Therefore, in a longer idle time, a large amount of steam with high parameters enters the condenser through the bypass system to be condensed, so that steam-water parameters of the waste heat boiler after final shutdown are lower, and the heat preservation and pressure maintaining effects of the waste heat boiler are fundamentally limited. In addition, because the water feed pump of the driver unit is provided with a back-warming pipeline, more high-parameter steam water can be returned to the low-pressure system from the high-pressure system through the pipeline after the driver unit is stopped, and the heat preservation and pressure maintaining effects of the residual furnace are reduced to a certain extent.
SUMMERY OF THE UTILITY MODEL
Based on the above, the utility model aims to solve the problem that the original starting and stopping operation method of the 9FA gas-steam combined cycle unit is difficult to adapt to the higher steam quality requirement required by auxiliary steam self-supply.
In order to achieve the above object, the present invention provides an auxiliary steam self-supply system for a gas-steam combined cycle unit, comprising: high-pressure steam pocket, middling pressure steam pocket, steam supply pipeline, middling pressure superheated steam export header and auxiliary steam system, the high-pressure steam pocket passes through steam supply pipeline connection middling pressure steam pocket, the middling pressure steam pocket is through supplying steam pipeline connection middling pressure superheated steam export header and auxiliary steam system.
And a steam supplementing electric valve and a steam supplementing regulating valve are arranged on the steam supplementing pipeline.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises a medium-pressure superheater, and the medium-pressure superheater is arranged on a steam supply pipeline between a medium-pressure steam drum and a medium-pressure superheated steam outlet header and an auxiliary steam system.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises a high-pressure bypass system, the high-pressure bypass system is connected with the high-pressure steam drum, and a high-pressure bypass valve and a high-pressure combined valve seat front drain valve are arranged on the high-pressure bypass system.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises an isolation valve, and the isolation valve is arranged on a steam supply pipeline from the medium-pressure steam drum to the auxiliary steam system.
The beneficial effect of this application:
1. the shutdown operation process is properly improved, the steam loss of the unit in the shutdown and coasting process is reduced, and the steam-water parameters of the residual furnace after shutdown are improved; an operation method for stopping the bypass system in advance is formulated, and the steam loss of the bypass system is reduced; the optimal rotating speed of the bypass system is selected to be stopped, the risk of overpressure of each steam pocket after the stop is prevented, and the safety of equipment after the stop of the unit is guaranteed while high-quality steam lost due to the bypass system during the idle running period is reduced as much as possible;
2. after the machine is shut down, an operation method for closing the back-warming valve to stop back-warming is formulated, so that high-quality steam and water lost due to back-warming pipelines are reduced; the measures of draining before closing the high-pressure joint valve seat in advance in the shutdown process and draining after delaying opening the high-pressure bypass in the startup process are adopted, so that the steam loss caused by a drainage system is reduced;
3. in the auxiliary steam self-supply process, the shaft seal pressure in the starting stage and before the steam turbine enters the steam is modified, so that the high-quality steam consumption caused by the supply of the shaft seal steam is reduced as much as possible on the premise of ensuring the safety of a unit;
4. in order to prevent abnormalities such as CV sudden closing and medium-pressure steam drum overpressure possibly caused in the auxiliary steam self-supply process, protection logics are set for a high-pressure to medium-pressure steam-supplementing electric valve and a high-pressure to medium-pressure steam-supplementing regulating valve related to auxiliary steam self-supply.
Drawings
FIG. 1 is a schematic diagram of an auxiliary steam self-supply system;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1, in the present embodiment, a gas-steam combined cycle unit auxiliary steam self-supply system includes: high-pressure steam pocket, middling pressure steam pocket, steam supply pipeline, middling pressure superheated steam export header and auxiliary steam system, the high-pressure steam pocket passes through steam supply pipeline connection middling pressure steam pocket, the middling pressure steam pocket is through supplying steam pipeline connection middling pressure superheated steam export header and auxiliary steam system.
And a steam supplementing electric valve and a steam supplementing regulating valve are arranged on the steam supplementing pipeline.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises a medium-pressure superheater, and the medium-pressure superheater is arranged on a steam supply pipeline between a medium-pressure steam drum and a medium-pressure superheated steam outlet header and an auxiliary steam system.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises a high-pressure bypass system, the high-pressure bypass system is connected with the high-pressure steam drum, and a high-pressure bypass valve and a high-pressure combined valve seat front drain valve are arranged on the high-pressure bypass system.
The auxiliary steam self-supply system of the gas-steam combined cycle unit further comprises an isolation valve, and the isolation valve is arranged on a steam supply pipeline from the medium-pressure steam drum to the auxiliary steam system.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A gas-steam combined cycle unit auxiliary steam self-supply system is characterized by comprising: high-pressure steam pocket, middling pressure steam pocket, steam supply pipeline, middling pressure superheated steam export header and auxiliary steam system, the high-pressure steam pocket passes through steam supply pipeline connection middling pressure steam pocket, the middling pressure steam pocket is through supplying steam pipeline connection middling pressure superheated steam export header and auxiliary steam system.
2. The auxiliary steam self-supply system of the gas-steam combined cycle unit as claimed in claim 1, wherein the steam supply line is provided with a steam supply electric valve and a steam supply regulating valve.
3. The auxiliary steam self-supply system of the gas-steam combined cycle unit as claimed in claim 1, further comprising an intermediate-pressure superheater, wherein the intermediate-pressure superheater is arranged on a steam supply pipeline from the intermediate-pressure steam drum to the intermediate-pressure superheated steam outlet header and the auxiliary steam system.
4. The auxiliary steam self-supply system of the gas-steam combined cycle unit as claimed in claim 1, further comprising a high pressure bypass system, wherein the high pressure bypass system is connected with a high pressure steam drum, and a high pressure bypass valve and a high pressure combined valve seat front drain valve are arranged on the high pressure bypass system.
5. The auxiliary steam self-supply system of the gas-steam combined cycle unit as claimed in claim 1, further comprising an isolation valve, wherein the isolation valve is arranged on a steam supply pipeline from the medium-pressure steam drum to the auxiliary steam system.
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CN202120374524.2U CN215566267U (en) | 2021-02-18 | 2021-02-18 | Auxiliary steam self-supply system of gas-steam combined cycle unit |
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CN202120374524.2U CN215566267U (en) | 2021-02-18 | 2021-02-18 | Auxiliary steam self-supply system of gas-steam combined cycle unit |
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