阅读说明：本技术 一种燃气轮机性能加热系统及其运行方法 (Gas turbine performance heating system and operation method thereof ) 是由 龙颜长 杨鹏 张大佳 刘珊伯 于 2020-06-16 设计创作，主要内容包括：本发明公开了一种燃气轮机性能加热系统及其运行方法,属于燃气轮机领域,包括性能加热器、性能加热器入口三通调节阀、性能加热器入口隔离阀、性能加热器出口隔离阀、性能加热器旁路隔离阀、天然气出口气动阀、加热器排空阀、烟气入口挡板、烟气出口挡板、烟道和余热锅炉烟囱；本发明取消燃气轮机组前置模块加热系统,直接引入部分燃气轮机排气来加热入口天然气,可提高燃机天然气入口温度且降低燃机排气温度,同时提高了天然气加热速度。(The invention discloses a performance heating system of a gas turbine and an operation method thereof, belonging to the field of gas turbines, and comprising a performance heater, a performance heater inlet three-way regulating valve, a performance heater inlet isolating valve, a performance heater outlet isolating valve, a performance heater bypass isolating valve, a natural gas outlet pneumatic valve, a heater emptying valve, a flue gas inlet baffle, a flue gas outlet baffle, a flue and a waste heat boiler chimney; the invention cancels a heating system of a front module of a gas turbine set, directly introduces part of gas turbine exhaust to heat inlet natural gas, can improve the inlet temperature of the natural gas of the gas turbine and reduce the exhaust temperature of the gas turbine, and simultaneously improves the heating speed of the natural gas.)

1. A performance heating system of a gas turbine is characterized by comprising a performance heater (1), a performance heater inlet three-way regulating valve (2), a performance heater inlet isolating valve (3), a performance heater outlet isolating valve (4), a performance heater bypass isolating valve (5), a natural gas outlet pneumatic valve (6), a heater emptying valve (7), a flue gas inlet baffle (8), a flue gas outlet baffle (9), a flue (10) and a waste heat boiler chimney (11); the inlet of the performance heater inlet three-way regulating valve (2) is connected with a natural gas inlet pipeline, the outlet of the performance heater inlet three-way regulating valve (2) is respectively connected with a performance heater inlet isolating valve (3) and a performance heater bypass isolating valve (5) through pipelines, the performance heater inlet isolating valve (3), the performance heater (1) and the performance heater outlet isolating valve (4) are sequentially connected through pipelines, the performance heater outlet isolating valve (4) and the performance heater bypass isolating valve (5) are connected with the inlet of a natural gas outlet pneumatic valve (6) through pipelines, and the outlet of the natural gas outlet pneumatic valve (6) is connected with a natural gas outlet pipeline; the performance heater (1) is arranged in a flue (10), the flue gas inlet baffle (8) and the flue gas outlet baffle (9) are respectively arranged at the inlet of the flue (10) and the outlet of the flue (10), and the outlet of the flue (10) is connected with a chimney (11) of the waste heat boiler; the heater emptying valve (7) is connected with the performance heater (1) through a pipeline.

2. The gas turbine performance heating system of claim 1, wherein the gas turbine combustion gas enters the performance heater (1) through the performance heater inlet three-way regulating valve (2) and the performance heater inlet isolation valve (3), and after being heated by the flue gas, enters the gas turbine fuel inlet through the performance heater outlet isolation valve (4) and the natural gas outlet pneumatic valve (6); flue gas exhausted by the gas turbine enters the performance heater (1) through the flue gas inlet baffle (8), and after natural gas is heated, the flue gas enters the waste heat boiler chimney (11) through the flue gas outlet baffle (9) and is exhausted.

3. Gas turbine performance heating system according to claim 2, characterized in that when natural gas does not need to be heated, the performance heater inlet isolation valve (3) and the performance heater outlet isolation valve (4) are closed, and natural gas enters the gas turbine fuel inlet through the performance heater inlet three-way regulating valve (2), the performance heater bypass isolation valve (5) and the natural gas outlet pneumatic valve (6).

4. The performance heating system of the gas turbine as claimed in claim 1, wherein an explosion-proof membrane valve (12) and a combustible gas detector (13) are arranged in the area of the flue (10) where the performance heater (1) is located, and when the pressure of flue gas in the flue (10) is too high, the explosion-proof membrane valve (12) is broken to release pressure, so that the tail flue (10) and related equipment are protected; the combustible gas detector (13) is used for detecting whether the fuel gas at the performance heater (1) leaks or not, and gives an alarm when detecting that the fuel gas leaks, so that the performance heater (1) is stopped emergently.

5. A method of operating a gas turbine performance heating system according to any one of claims 1 to 4, characterised by the following process: at the initial stage of ignition of the gas turbine, checking that the explosion-proof membrane valve (12) is not broken, firstly opening the performance heater inlet three-way regulating valve (2) and the performance heater inlet isolating valve (3), enabling natural gas to enter the performance heater (1) to pressurize the performance heater, checking that a combustible gas detector (13) has no gas leakage and alarming, respectively opening the performance heater outlet isolating valve (4), the performance heater bypass isolating valve (5) and the natural gas outlet pneumatic valve (6), and introducing the natural gas into the gas turbine; opening a flue gas outlet baffle (9) and a flue gas inlet baffle (8) in sequence, and gradually introducing the exhaust gas of the gas turbine into a flue (10); the inlet three-way regulating valve (2) of the performance heater and the flue gas inlet baffle (8) are put into operation automatically, so that the system automatically regulates the temperature of the natural gas; when the natural gas temperature of the performance heater (1) is high and the high value is alarmed or exceeds the ignition temperature of the natural gas, the system logic directly controls to close the inlet isolation valve (3) of the performance heater, the outlet isolation valve (4) of the performance heater and the flue gas inlet baffle (8), and the gas turbine trips; when the natural gas temperature of the performance heater (1) is high and the value is high, the system logically controls to close the performance heater inlet isolation valve (3), the performance heater outlet isolation valve (4) and the flue gas inlet baffle (8), the performance heater (1) exits, the natural gas is switched to a bypass and enters a fuel inlet of the gas turbine through the performance heater bypass isolation valve (5); when the temperature of the performance heater (1) is high, the operator is informed to pay attention to patrol and examine the reason that the temperature of the natural gas is high; when the combustible gas detector (13) gives an alarm, the system logically controls to close the performance heater inlet isolation valve (3), the performance heater outlet isolation valve (4) and the flue gas inlet baffle (8), and natural gas is switched to a bypass to enter the gas turbine.

Technical Field

The invention relates to the field of gas turbines, in particular to a gas turbine performance heating system and an operation method thereof.

Background

At present, the safety and the economy of a single-cycle gas turbine unit or a combined cycle gas turbine unit are improved by increasing the natural gas inlet temperature of a gas turbine. For the single-cycle gas turbine unit, because a waste heat boiler system is not provided, the inlet natural gas is heated mainly in an electric heating mode in a water-deficient area, and the defects of high power consumption, low economy and the like exist; for a combined cycle gas turbine set, high-temperature feed water of a boiler is mostly adopted to heat inlet natural gas, and the combined cycle gas turbine set has the defects of low water consumption, low heat exchange efficiency and the like, and also has the defects that the high-temperature feed water cannot be used for heating in the ignition and initial load stage of a gas turbine, the system is too long in operation time and the like.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a novel gas turbine performance heating system which is reasonable in structural design, higher and faster in heating temperature and simple to operate. This novel gas turbine performance heating system's design philosophy is for cancelling the leading-in module heating system of gas turbine group, and the partial gas turbine exhaust of direct introduction heats the entry natural gas, can improve gas turbine natural gas entry temperature and reduce gas turbine exhaust temperature, compares traditional performance heater heating temperature 200 multispeeds, can heat the natural gas temperature, and the economic nature is better, has improved natural gas rate of heating simultaneously.

The technical scheme adopted by the invention for solving the problems is as follows: a performance heating system of a gas turbine is characterized by comprising a performance heater, a performance heater inlet three-way regulating valve, a performance heater inlet isolating valve, a performance heater outlet isolating valve, a performance heater bypass isolating valve, a natural gas outlet pneumatic valve, a heater emptying valve, a flue gas inlet baffle, a flue gas outlet baffle, a flue and a waste heat boiler chimney; the inlet of the performance heater inlet three-way regulating valve is connected with a natural gas inlet pipeline, the outlet of the performance heater inlet three-way regulating valve is respectively connected with a performance heater inlet isolating valve and a performance heater bypass isolating valve through pipelines, the performance heater inlet isolating valve, the performance heater and the performance heater outlet isolating valve are sequentially connected through pipelines, the performance heater outlet isolating valve and the performance heater bypass isolating valve are connected with the inlet of a natural gas outlet pneumatic valve through pipelines, and the outlet of the natural gas outlet pneumatic valve is connected with a natural gas outlet pipeline; the performance heater is arranged in the flue, the flue gas inlet baffle and the flue gas outlet baffle are respectively arranged at the inlet of the flue and the outlet of the flue, and the outlet of the flue is connected with a chimney of the waste heat boiler; the heater evacuation valve is connected with the performance heater through a pipeline.

Furthermore, the gas turbine enters the performance heater through the performance heater inlet three-way regulating valve and the performance heater inlet isolating valve, and after being heated by the flue gas, the gas turbine enters the gas turbine fuel inlet through the performance heater outlet isolating valve and the natural gas outlet pneumatic valve, so that the temperature of the gas turbine gas inlet is increased.

Furthermore, the flue gas discharged by the gas turbine enters the performance heater through the flue gas inlet baffle, and after the natural gas is heated, the flue gas enters the waste heat boiler chimney through the flue gas outlet baffle to be discharged, so that the temperature of the flue gas discharged by the gas turbine is reduced.

Further, when the natural gas does not need to be heated, the performance heater inlet isolation valve and the performance heater outlet isolation valve can be closed, and the natural gas enters the fuel inlet of the gas turbine through the performance heater inlet three-way adjusting valve, the performance heater bypass isolation valve and the natural gas outlet pneumatic valve.

Furthermore, an anti-explosion membrane valve and a combustible gas detector are arranged in the flue area where the performance heater is located, and when the pressure of flue gas in the flue is too high, the anti-explosion membrane valve can be broken to release pressure, so that an anti-explosion effect is achieved, and the tail flue and related equipment are protected; the combustible gas detector is used for detecting whether the fuel gas at the performance heater leaks or not, and giving an alarm when the fuel gas is detected to leak so as to emergently stop the performance heater.

The operation method of the performance heating system of the gas turbine is characterized by comprising the following steps of: in the initial stage of ignition of the gas turbine, checking that the explosion-proof membrane valve is not broken, starting the performance heater inlet three-way regulating valve and the performance heater inlet isolating valve firstly, enabling natural gas to enter the performance heater to pressurize the natural gas, checking that a combustible gas detector has no gas leakage and alarming, and then respectively starting the performance heater outlet isolating valve, the performance heater bypass isolating valve and the natural gas outlet pneumatic valve, wherein the natural gas is introduced into the gas turbine; opening the flue gas outlet baffle and the flue gas inlet baffle in sequence, and gradually introducing the exhaust gas of the gas turbine into a flue; the inlet three-way regulating valve of the performance heater and the flue gas inlet baffle are put into operation automatically, so that the system automatically regulates the temperature of the natural gas; when the natural gas temperature of the performance heater is high or exceeds the ignition temperature of the natural gas, the system logic directly controls and closes the inlet isolation valve of the performance heater, the outlet isolation valve of the performance heater and the flue gas inlet baffle, and the gas turbine trips; when the natural gas temperature of the performance heater is high and the value is high, the system logically controls and closes the inlet isolation valve of the performance heater, the outlet isolation valve of the performance heater and the flue gas inlet baffle, the performance heater is withdrawn, and the natural gas is switched to a bypass and enters the fuel inlet of the gas turbine through the bypass isolation valve of the performance heater; when the temperature of the performance heater is high, the operator is informed to pay attention to patrol and examine the reason that the temperature of the natural gas is high; when the combustible gas detector gives an alarm, the system logically controls and closes the performance heater inlet isolation valve, the performance heater outlet isolation valve and the flue gas inlet baffle, and natural gas is switched to a bypass to enter the gas turbine.

Compared with the prior art, the invention has the following advantages and effects: the device is simple to operate, a front module heating system of the gas turbine is omitted, the inlet natural gas of the gas turbine is heated by directly adopting the flue gas exhausted by the gas turbine, the inlet temperature of the natural gas of the gas turbine can be increased, the exhaust temperature of the gas turbine can be reduced, and the heating speed of the natural gas is increased.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: the device comprises a performance heater 1, a performance heater inlet three-way adjusting valve 2, a performance heater inlet isolating valve 3, a performance heater outlet isolating valve 4, a performance heater bypass isolating valve 5, a natural gas outlet pneumatic valve 6, a heater emptying valve 7, a flue gas inlet baffle plate 8, a flue gas outlet baffle plate 9, a flue 10, a waste heat boiler chimney 11, an explosion-proof thin film valve 12 and a combustible gas detector 13.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.