CN116146350A - Supply system, combustion apparatus, and control method of supply system - Google Patents

Abstract

The application discloses a supply system, combustion equipment and a control method of the supply system, and belongs to the technical field of environmental protection. The disclosed supply system is used for being communicated with a combustion chamber of a gas turbine, the supply system comprises a gas supply device, a cooling water supply device and a gas purging device, the gas supply device is provided with a gas inlet, a first gas outlet and a second gas outlet which are communicated, and the first gas outlet is used for being communicated with the combustion chamber; the cooling water supply device is provided with a water supply port and a water discharge port which are communicated, the water discharge port is used for being communicated with the combustion chamber through a water pipe of the gas turbine, and the gas purging device can be communicated with the second gas outlet and the water pipe under the condition that the cooling water supply device is in a non-working state. The above-described configuration can solve the problem that the cooling water supply device of the supply system according to the related art is liable to affect the operation performance of the gas turbine.

Description

Supply system, combustion apparatus, and control method of supply system

Technical Field

The application belongs to the technical field of environmental protection, and particularly relates to a supply system, combustion equipment and a control method of the supply system.

Background

Gas turbines are often used in power generation, wellsite fracturing, etc. scenarios, where the required gas is typically provided to the combustion chamber of the gas turbine by a supply system. When the gas turbine works, the main pollutant discharged by combustion is nitrogen oxide, and in order to reduce the content of the nitrogen oxide, the commonly adopted technical methods include water injection into a combustion chamber of the gas turbine, a steam technology, a dry low-emission technology, a selective catalytic reduction technology and the like.

The technical method for injecting water into the combustion chamber mainly comprises the steps of reducing the temperature of combustion flame after absorbing heat of the combustion chamber through cooling water provided by a cooling water supply device of a supply system, so that the formation of nitrogen oxides after combustion is reduced, meanwhile, the ratio of the water injection amount to the gas amount used by the gas turbine is very important for controlling the emission of the nitrogen oxides, the efficiency and the service life of the gas turbine are reduced due to the excessive water consumption, the cost is increased due to the excessive water consumption, the effect of reducing pollutant emission is not achieved due to the insufficient water injection amount to the gas amount ratio, and the water injection amount to the gas amount ratio required by the gas turbine is dynamically changed along with the change of load, so that the water injection amount is required to be adjusted in real time to adapt to the change of the gas amount.

However, as the content of calcium and magnesium plasma in the cooling water provided by the cooling water supply device is more, and the cooling water is in contact with the nozzle spraying water to the combustion chamber for a long time, the nozzle is scaled, so that the nozzle is blocked, the cooling water is not easy to enter the combustion chamber, and the working performance of the gas turbine is easily affected. As is clear from the above, the cooling water supply device of the supply system according to the related art has a problem that the operation performance of the gas turbine is easily affected.

Disclosure of Invention

The application discloses a supply system, a combustion device and a control method of the supply system, which are used for solving the problem that a cooling water supply device of the supply system related to the related technology easily influences the working performance of a gas turbine.

In order to solve the technical problems, the application adopts the following technical scheme:

a supply system for communication with a combustion chamber of a gas turbine, the supply system comprising a gas supply, a cooling water supply and a gas purge,

the fuel gas supply device is provided with a fuel gas inlet, a first fuel gas outlet and a second fuel gas outlet which are communicated, and the first fuel gas outlet is used for being communicated with the combustion chamber;

the cooling water supply device is provided with a water supply port and a water discharge port which are communicated, the water discharge port is used for being communicated with the combustion chamber through a water pipe of the gas turbine, and the gas purging device can be communicated with the second gas outlet and the water pipe under the condition that the cooling water supply device is in a non-working state.

A combustion apparatus comprising the supply system described above for communicating with the combustion chamber of the gas turbine and the gas turbine.

A control method of a supply system, applied to the supply system described above, comprising:

detecting the working state of the cooling water supply device;

and under the condition that the cooling water supply device is in a non-working state, controlling the gas purging device to communicate the second gas outlet with the water delivery pipe.

The technical scheme that this application adopted can reach following beneficial effect:

in this application, gas supply device and the cooling water supply device of feed system can provide gas and cooling water to gas turbine's combustion chamber, and under the circumstances that cooling water supply device is in non-operating condition, gas purge device can communicate gas supply device's second gas export and gas turbine's raceway, gas that gas supply device provided can flow to gas purge device and raceway in proper order through the second gas export promptly, at this moment, high-pressure gas can purge the inside residual water of raceway and the precipitate after the evaporation to purify the raceway, and then avoid the precipitate to block up the nozzle that the raceway was supplied water towards gas turbine, and then avoid the phenomenon that the cooling water is difficult to get into the combustion chamber, and then avoid influencing gas turbine's working property. Accordingly, the supply system disclosed in the present application can solve the problem that the cooling water supply device of the supply system related to the related art easily affects the operation performance of the gas turbine.

Drawings

FIG. 1 is a schematic view of a connection structure of a water pipe of a gas turbine and a supply system disclosed in an embodiment of the present application;

FIG. 2 is a schematic view of a fuel gas supply apparatus according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a cooling water supply device disclosed in an embodiment of the present application;

FIG. 4 is a schematic diagram of the structures of a second shut-off valve and a third shut-off valve disclosed in an embodiment of the present application;

fig. 5 is a flow chart of a control method of the supply system disclosed in the embodiment of the present application.

Reference numerals illustrate:

100-gas supply, 101-gas inlet, 102-first gas outlet, 103-second gas outlet, 110-metering valve, 120-first ball valve, 130-first detection piece, 140-first filter, 150-first differential pressure transmitter, 160-second shut-off valve, 161-second solenoid valve, 162-piston, 163-shut-off valve body, 164-shut-off position switch, 165-on position switch, 170-third shut-off valve, 171-meter control zone, 180-flame arrester, 181-safety vent zone, 190-second filter;

200-cooling water supply device, 201-water supply port, 202-water discharge port, 210-conductivity meter, 220-water injection pump, 221-safety valve, 230-motor, 240-flowmeter, 250-first check valve, 260-first shutoff valve, 270-second ball valve, 281-second detection piece, 282-third detection piece, 290-third filter, 291-second differential pressure transmitter;

300-gas purging device, 310-gas pipe, 320-first electromagnetic valve, 330-second one-way valve;

400-water delivery pipe.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The supply system disclosed in the embodiments of the present application will be described in detail below with reference to the accompanying drawings by means of specific embodiments and application scenarios thereof.

Referring to fig. 1 to 5, the present application discloses a supply system including a gas supply device 100, a cooling water supply device 200, and a gas purge device 300.

The supply system disclosed herein can be used to communicate with the combustion chamber of a gas turbine to provide gas and cooling water to the combustion chamber, the cooling water is used to reduce the temperature of the combustion chamber to ensure proper operation of the gas turbine, and simultaneously, the cooling water reduces the temperature of the combustion chamber to reduce the formation of nitrogen oxides after combustion of the gas, thereby achieving the purpose of protecting the environment.

Specifically, the gas supply device 100 is a main component of a supply system for supplying gas to a combustion chamber, the gas supply device 100 has a gas inlet 101, a first gas outlet 102 and a second gas outlet 103 which are communicated, i.e., the gas passing through the gas inlet 101 can flow to the first gas outlet 102 and the second gas outlet 103, respectively, and the first gas outlet 102 is used to communicate with the combustion chamber so that the gas can smoothly enter the combustion chamber.

The cooling water supply device 200 is a main component of a supply system for supplying cooling water to a combustion chamber, the cooling water supply device 200 is provided with a water supply port 201 and a water discharge port 202 which are communicated with each other, the water discharge port 202 is used for communicating with the combustion chamber through a water pipe 400 of a gas turbine, namely, the cooling water passing through the water supply port 201 can flow to the water discharge port 202 and flow into the water pipe 400 of the gas turbine through the water discharge port 202, a nozzle is arranged on the water pipe 400, and the nozzle can spray the cooling water into the combustion chamber.

The gas purging device 300 may be used to introduce the gas supplied from the gas supplying device 100 into the water pipe 400, specifically, in the case where the cooling water supplying device 200 is in a non-operating state, the gas purging device 300 may communicate the second gas outlet 103 with the water pipe 400, at this time, since the cooling water supplying device 200 is in a non-operating state, a small portion of cooling water and evaporated sediment may remain in the water pipe 400, in order to prevent the sediment from blocking the nozzle, the gas purging device 300 may be in an operating state, i.e., the gas purging device 300 may deliver the high-pressure gas at the second gas outlet 103 into the water pipe 400 to purge the residual water and the evaporated sediment, and the residual water and the evaporated sediment may easily enter the combustion chamber through the nozzle under the purging action of the high-pressure gas, thereby achieving the purpose of purifying the water pipe 400.

In this application, the gas supply device 100 and the cooling water supply device 200 of the supply system can provide gas and cooling water for the combustion chamber of the gas turbine, and under the condition that the cooling water supply device 200 is in a non-working state, the gas purging device 300 can be communicated with the second gas outlet 103 of the gas supply device 100 and the water pipe 400 of the gas turbine, that is, the gas provided by the gas supply device 100 can flow to the gas purging device 300 and the water pipe 400 sequentially through the second gas outlet 103, at this time, the high-pressure gas can purge the residual water in the water pipe 400 and the evaporated sediment, thereby purifying the water pipe 400, further avoiding the phenomenon that the sediment blocks the nozzle of the water pipe 400 for supplying water to the gas turbine, further avoiding the phenomenon that the cooling water is less easy to enter the combustion chamber, and further avoiding affecting the working performance of the gas turbine. Accordingly, the supply system disclosed in the present application can solve the problem that the cooling water supply device 200 of the supply system related to the related art easily affects the operation performance of the gas turbine.

In one embodiment, the cooling water supplied from the cooling water supply device 200 to the combustion chamber may directly enter the water pipe 400 through the water outlet 202. In another embodiment, since the cooling water may contain more calcium and magnesium plasma, the cooling water may cause the nozzle to scale after contacting with the nozzle on the water pipe 400 for a long time, so as to seal the nozzle, which easily affects the performance of the gas turbine, and therefore, the cooling water supply device 200 may be provided with a conductivity meter 210, where the conductivity meter 210 is disposed between the water supply port 201 and the water outlet port 202, for detecting the conductivity value of the cooling water, and if the conductivity value is greater than the preset conductivity threshold, it is indicated that the cooling water contains more calcium and magnesium plasma, i.e. the cooling water does not reach the standard, at this time, the cooling water supply device 200 may be stopped, i.e. the cooling water supply device 200 is in a non-working state, and the gas purging device 300 may be connected to the second gas outlet 103 and the water pipe 400 to purge the water pipe 400, so as to avoid the nozzle from being sealed.

Alternatively, the cooling water supply device 200 may include a centrifugal pump, which may communicate with the water supply port 201 and the water discharge port 202, and which may be used to regulate the second total amount of cooling water entering the combustion chamber through the water pipe 400.

In another embodiment, the gas supply device 100 is provided with a metering valve 110, the metering valve 110 can be communicated with the gas inlet 101, the first gas outlet 102 and the second gas outlet 103, and the metering valve 110 is used for controlling the first total amount of the gas entering the combustion chamber, namely, the metering valve 110 controls the first total amount through the valve opening of the metering valve, and the valve opening of the metering valve 110 is related to the load of the gas turbine; the cooling water supply device 200 includes a water injection pump 220 and a motor 230, the water injection pump 220 is capable of communicating with the water supply port 201 and the water discharge port 202, the water injection pump 220 is connected with the motor 230, and the motor 230 is used for adjusting the rotation speed of the water injection pump 220 according to the total preset ratio of the cooling water and the fuel gas and the first total amount, i.e. the motor 230 can adjust the rotation speed of the water injection pump 220 to adjust the discharge flow rate of the water injection pump 220, and then adjust the second total amount of the cooling water injected into the combustion chamber.

In this embodiment, because the rotation speed and the total amount of the motor 230 are preset to be the same as the first total amount and the second total amount of the cooling water required by the combustion chamber, this makes the second total amount of the cooling water provided by the cooling water supply device 200 be relatively matched with the actual requirement, and compared with the scheme of adopting the centrifugal pump, the scheme of the water injection pump 220 and the motor 230 adopted in the application has the advantage of larger flow adjustment range, and meanwhile, the water injection pump 220 can reach higher water injection pressure relative to the centrifugal pump, so that the working condition range applicable by the setting mode is wider.

Alternatively, the water injection pump 220 may be a positive displacement pump, specifically may be a pump such as a gear pump, a plunger pump or a vane pump, and the motor 230 may be a variable frequency motor, and the rotational speed of the motor 230 is changed by a variable frequency speed regulation technology, so as to change the discharge flow rate of the water injection pump 220, so as to achieve the amount of cooling water required by the combustion chamber.

Optionally, the cooling water supply apparatus 200 may further include a safety valve 221, the safety valve 221 being provided at both ends of the water injection pump 220 for limiting the water injection pressure of the water injection pump 220, thereby protecting the use safety of the cooling water supply apparatus 200.

Optionally, the cooling water supply apparatus 200 may further include a second detecting member 281, where the second detecting member 281 is disposed between the water supply port 201 and the water injection pump 220, for detecting at least one of a first pressure value and a first temperature value of the cooling water entering the water injection pump 220, that is, the second detecting member 281 may determine whether the start condition of the water injection pump 220 is reached by detecting at least one of the first pressure value and the first temperature value of the cooling water entering the water supply port 201, so as to prevent the water injection pump 220 from having a problem of excessive leakage or seal breakage.

Optionally, the cooling water supply device 200 may further include a third detecting member 282, where the third detecting member 282 is disposed between the water injection pump 220 and the water outlet 202, for detecting at least one of a second pressure value and a second temperature value of the cooling water entering the combustion chamber, that is, the third detecting member 282 may determine whether the pressure and the temperature of the cooling water discharged from the water injection pump 220 reach the water injection temperature requirement and the pressure requirement of the gas turbine by detecting at least one of the second pressure value and the second temperature value of the cooling water discharged from the water injection pump 220, so as to ensure the cooling efficiency of the cooling water supplied from the cooling water supply device 200 to the combustion chamber.

Optionally, the cooling water supply apparatus 200 may further include a third filter 290 provided between the water injection pump 220 and the water discharge port 202 for filtering the high pressure cooling water discharged from the water injection pump 220, thereby removing impurities in the cooling water to avoid clogging the nozzle. Optionally, the third filter 290 may be a duplex filter, which has advantages of good filtering effect, good sealing performance, strong circulation capability, simple operation, etc.

Optionally, as the impurities filtered by the third filter 290 accumulate on the filter element, as the service time of the third filter 290 is longer and longer, the amount of the impurities on the filter element is more and more, and the amount of the cooling water passing through the third filter 290 is gradually reduced, at this time, the two ends of the third filter 290 generate a larger pressure difference, which easily affects the service life of the filter element, and further easily affects the filtering effect of the third filter 290, and for monitoring the pressure difference of the two ends of the third filter 290 in real time, the cooling water supply device 200 may further include a second pressure difference transmitter 291, where the second pressure difference transmitter 291 is disposed at the two ends of the third filter 290, so as to detect the pressure difference of the two ends of the third filter 290 in real time, and when the pressure difference value is detected to be increased to a certain level, the filter element needs to be replaced in time, so as not to affect the filtering effect of the third filter 290.

Alternatively, the present application may calculate the second total amount of cooling water required by the preset ratio of the total amount of cooling water and fuel gas and the first total amount of fuel gas entering the combustion chamber, so that the cooling water provided by the cooling water supply device 200 is matched with the actual requirement.

In order to make the cooling water supplied from the cooling water supply device 200 more matched with the actual demand, in another embodiment, the cooling water supply device 200 further includes a flow meter 240, where the flow meter 240 is disposed between the water injection pump 220 and the water outlet 202, so as to detect the second total amount, that is, the second total amount of the cooling water supplied from the cooling water supply device 200 can be detected by the flow meter 240, so as to check and determine whether the amount of the cooling water supplied from the cooling water supply device 200 meets the actual demand, thereby achieving the purpose of more matching the cooling water supplied from the cooling water supply device 200 with the actual demand.

Alternatively, after the fuel gas enters the water pipe 400 through the fuel gas purging device 300, most of the fuel gas enters the combustion chamber after purging the water pipe 400, and as the water pipe 400 is connected with the water outlet 202, a small portion of the fuel gas may move toward the cooling water supply device 200.

In another embodiment, the cooling water supply device 200 is provided with the first check valve 250, the first check valve 250 is disposed between the water supply port 201 and the water discharge port 202, that is, the cooling water passing through the water supply port 201 can flow to the water discharge port 202 through the first check valve 250, but the cooling water at the water discharge port 202 cannot flow to the water supply port 201 through the first check valve 250, at this time, the fuel gas cannot enter the cooling water supply device 200 through the first check valve 250, which can protect other components of the cooling water supply device 200 to a certain extent, so as to ensure that the cooling water supply device 200 can work normally, and meanwhile, the first check valve 250 can avoid the mixing phenomenon of the cooling water and the fuel gas.

Alternatively, the gas purging device 300 may include a gas pipe 310 and a first electromagnetic valve 320, where one end of the gas pipe 310 is connected to the second gas outlet 103, the other end of the gas pipe 310 is connected to the water pipe 400, the first electromagnetic valve 320 is disposed on the gas pipe 310, opening the first electromagnetic valve 320 may enable the second gas outlet 103 to be connected to the water pipe 400 to purge and purify the water pipe 400, and closing the first electromagnetic valve 320 may enable the second gas outlet 103 to be not connected to the water pipe 400.

In another embodiment, the gas purging device 300 may further include a second check valve 330, where the first electromagnetic valve 320 and the second check valve 330 are both disposed on the gas pipe 310, and the second check valve 330 is disposed on a side of the first electromagnetic valve 320 close to the water pipe 400, that is, the second check valve 330 is disposed closer to the water pipe 400 than the first electromagnetic valve 320, and the gas may flow to the water pipe 400 through the second check valve 330, but the cooling water in the water pipe 400 cannot flow to the first electromagnetic valve 320 through the second check valve 330, which may protect the first electromagnetic valve 320 to a certain extent, so as to ensure that the first electromagnetic valve 320 can work normally, and meanwhile, the second check valve 330 may also avoid a phenomenon that the cooling water and the gas are mixed.

Optionally, the cooling water supply device 200 is provided with a first shut-off valve 260, the first shut-off valve 260 is disposed between the water supply port 201 and the water discharge port 202, the first shut-off valve 260 may be disposed near the water supply port 201, the opening of the first shut-off valve 260 may allow cooling water to enter the water pipe 400, and the closing of the first shut-off valve 260 may allow the cooling water supply device 200 to stop supplying water to the combustion chamber.

In another embodiment, to make the cooling water supply device 200 stop supplying water to the combustion chamber more timely, the first shut-off valve 260 may be disposed close to the water outlet 202, that is, the first shut-off valve 260 is disposed closer to the water pipe 400, at this time, closing the first shut-off valve 260 may immediately stop supplying water to the water pipe 400, and thus, the supply of water to the combustion chamber may be stopped more timely, thereby avoiding wasting the cooling water.

Optionally, the supply system may further include a control device, where the control device is communicatively connected to the first shut-off valve 260 and the first electromagnetic valve 320, and the control device may control the first shut-off valve 260 and the first electromagnetic valve 320 to be in an operating state at the same time, that is, cooling water and fuel gas may enter the water pipe 400 at the same time.

In another embodiment, the first shut-off valve 260 and the first electromagnetic valve 320 may not be in the working state at the same time, that is, in the case that the first shut-off valve 260 is in the working state, the control device may control the first electromagnetic valve 320 to be in the non-working state, and in the case that the first electromagnetic valve 320 is in the working state, the control device controls the first shut-off valve 260 to be in the non-working state, at this time, the fuel gas and the cooling water do not enter the water pipe 400 at the same time, that is, the fuel gas and the cooling water do not mix in the water pipe 400, which may ensure the cooling effect of the cooling water to some extent, and ensure that the gas turbine can work normally.

Alternatively, the gas supply device 100 may be provided with a first ball valve 120 at the gas inlet 101, and opening the first ball valve 120 may allow gas to enter the gas supply device 100 so that the gas supply device 100 may stably supply gas to the combustion chamber.

Alternatively, the cooling water supply device 200 may be provided with a second ball valve 270 at the water supply port 201, and opening the second ball valve 270 may allow cooling water to enter the cooling water supply device 200 so that the cooling water supply device 200 may stably supply cooling water to the combustion chamber.

Optionally, the gas supply device 100 may further include a first detecting member 130, where the first detecting member 130 is disposed between the gas inlet 101 and the first gas outlet 102 and the second gas outlet 103, for detecting at least one of a third pressure value and a third temperature value of the gas entering the combustion chamber, that is, the first detecting member 130 may determine whether the pressure and the temperature of the gas reach a start condition of the gas turbine by detecting at least one of the third pressure value and the third temperature value of the gas at the gas inlet 101, and if at least one of the third pressure value and the third temperature value does not meet the start condition, the gas turbine is not allowed to start, and if at least one of the third pressure value and the third temperature value detected by the first detecting member 130 does not meet the requirement during the operation of the gas turbine, the gas turbine is required to stop operating.

Optionally, the gas supply apparatus 100 may further include a first filter 140, and the first filter 140 may be disposed near the gas inlet 101 such that the first filter 140 primarily filters the gas.

In a further embodiment, the gas supply device 100 may further include a second filter 190, where the second filter 190 may be disposed near the first gas outlet 102 and the second gas outlet 103, that is, the second filter 190 is disposed between the first filter 140 and the first gas outlet 102 and the second gas outlet 103, the first filter 140 is used for filtering particles with a first size, the second filter 190 is used for filtering particles with a second size, and the first size may be larger than the second size, that is, after the gas is primarily filtered by the first filter 140, moisture and larger solid particles entrained in the gas may be filtered, and after the gas is filtered by the second filter 190, finer particles in the gas may be removed, so that the gas better conforms to the operating conditions of the gas turbine.

Optionally, as the impurities filtered by the first filter 140 can accumulate on the filter element, along with the longer and longer service time of the first filter 140, the impurities on the filter element can be more and more, the amount of the fuel gas passing through the first filter 140 is gradually reduced, at this time, the two ends of the first filter 140 can generate a larger pressure difference, which easily affects the service life of the filter element, and further easily affects the filtering effect of the first filter 140, for monitoring the pressure difference of the two ends of the first filter 140 in real time, the fuel gas supply device 100 can further include a first pressure difference transmitter 150, and the first pressure difference transmitter 150 is arranged at the two ends of the first filter 140, so as to detect the pressure difference of the two ends of the first filter 140 in real time, and when the pressure difference value is detected to be up to a certain level, the filter element needs to be replaced in time, so as not to affect the filtering effect of the first filter 140.

Further, the third differential pressure transmitters can be also arranged at two ends of the second filter 190, and the differential pressure at two ends of the second filter 190 can be detected in real time through the third differential pressure transmitters, so that when the differential pressure value is detected to be raised to a certain level, the filter element can be replaced in time, and the filtering effect of the second filter 190 is prevented from being influenced.

Optionally, the gas supply device 100 may further include a second shut-off valve 160, where the second shut-off valve 160 is disposed between the gas inlet 101 and the first gas outlet 102 and the second gas outlet 103, and opening the second shut-off valve 160 may enable the gas to enter the combustion chamber through the first gas outlet 102, and closing the second shut-off valve 160 may enable the gas supply device 100 to quickly stop providing the gas to the combustion chamber.

Specifically, the second shut-off valve 160 may include a second solenoid valve 161, a piston 162, and a shut-off valve body 163, the shut-off valve body 163 having an inlet communicating with the gas inlet 101, an outlet communicating with the first gas outlet 102 and the second gas outlet 103, and a relief port communicating with the safety vent 181, and the shut-off valve body 163 being equivalent to a three-way reversing valve, the piston 162 may be operated under the action of the second solenoid valve 161, i.e., the piston 162 may push the valve spool of the shut-off valve body 163 to block the inlet to communicate the outlet with the relief port, or the piston 162 may push the valve spool to block the relief port to communicate the inlet with the outlet.

When the second electromagnetic valve 161 receives a start signal of the gas turbine, the second electromagnetic valve 161 drives the piston 162 to operate under the action of the instrument control area 171, so that the piston 162 pushes the valve core to block the scattering port, the inlet and the outlet of the shutoff valve body 163 are communicated, and the gas inlet 101 is communicated with the first gas outlet 102 and the second gas outlet 103; when the second electromagnetic valve 161 receives a shutdown signal of the gas turbine, the second electromagnetic valve 161 drives the piston 162 to operate under the action of the instrument control area 171, so that the piston 162 pushes the valve core to block the inlet, and further the diffusing port of the shutoff valve body 163 is communicated with the outlet, at this time, gas supply to the combustion chamber can be stopped rapidly, meanwhile, residual gas between the outlet and the first gas outlet 102 and the second gas outlet 103 can flow to the diffusing port through the outlet, and then is discharged to the safety discharge area 181 through the diffusing port, so that the gas turbine is stopped rapidly.

Optionally, a flame arrestor 180 may be disposed between the relief port and the safety vent 181, and the flame arrestor 180 may prevent combustion of the fuel gas within the fuel gas supply 100, thereby protecting the fuel gas supply 100.

Optionally, the second shut-off valve 160 may further include a closed position switch 164 and an open position switch 165, where the valve state of the second shut-off valve 160 may be fed back by the closed position switch 164 and the open position switch 165, and the open state of the shut-off valve body 163 may be detected in real time through the closed position switch 164 and the open position switch 165, so that abnormal shutdown caused by unknown faults of the second shut-off valve 160 is avoided.

Further, the gas supply device 100 may further include a third shut-off valve 170, where the third shut-off valve 170 is disposed between the gas inlet 101 and the first gas outlet 102 and the second gas outlet 103, that is, the second shut-off valve 160 and the third shut-off valve 170 are sequentially disposed, and the structures and functions of the second shut-off valve 160 and the third shut-off valve 170 may be the same. Therefore, the dual-stage shut-off valve formed by the second shut-off valve 160 and the third shut-off valve 170 can play a role in double protection, i.e. the phenomenon that the gas supply cannot be stopped in time due to the failure of emergency shut-off after the shutdown signal is given caused by the failure of the single shut-off valve can be prevented.

Optionally, the present application also discloses a combustion apparatus comprising the above-described supply system for communicating with a combustion chamber of a gas turbine to provide gas and cooling water to the combustion chamber, and the gas turbine.

Optionally, the present application further discloses a control method of a supply system, applied to the supply system described above, where the control method of the supply system includes:

s100, detecting the working state of the cooling water supply device 200.

Specifically, the detection means of the supply system may detect the operation state of the cooling water supply device 200, that is, detect whether the cooling water supply device 200 supplies cooling water to the combustion chamber of the gas turbine, and in the case where the cooling water supply device 200 is in the non-operation state, indicate that the cooling water supply device 200 does not supply cooling water to the combustion chamber, and in the case where the cooling water supply device 200 is in the operation state, indicate that the cooling water supply device 200 is supplying cooling water to the combustion chamber.

And 200, controlling the gas purging device 300 to communicate the second gas outlet 103 with the water delivery pipe 400 when the cooling water supply device 200 is in a non-working state.

Specifically, when the detection device detects that the cooling water supply device 200 is in the non-working state, it indicates that no cooling water flows in the water pipe 400 of the gas turbine, at this time, the supply system may control the gas purging device 300 to communicate with the second gas outlet 103 and the water pipe 400, specifically, the control device of the supply system may control the gas purging device 300 to be in the working state, and the gas purging device 300 in the working state may communicate with the second gas outlet 103 and the water pipe 400, so that the gas provided by the gas supply device 100 may enter the water pipe 400 through the second gas outlet 103 and the gas purging device 300 to purge and purify the water pipe 400.

In this application, under the condition that detects cooling water supply device 200 and be in non-operating condition, gas purge device 300 can communicate the second gas export 103 of gas supply device 100 and gas turbine's raceway 400, the gas that gas supply device 100 provided can flow gradually gas purge device 300 and raceway 400 through second gas export 103, at this moment, high-pressure gas can sweep the inside residual water of raceway 400 and the precipitate after the evaporation, thereby purify raceway 400, and then avoid the precipitate to block up the nozzle that raceway 400 was supplied water towards gas turbine, and then avoid the phenomenon that the cooling water is difficult to get into the combustion chamber, and then avoid influencing gas turbine's working property. Accordingly, the control method of the supply system disclosed in the present application can solve the problem that the cooling water supply device 200 of the supply system according to the related art easily affects the operation performance of the gas turbine.

Optionally, the control method of the supply system further includes:

s300, detecting the conductivity value of the cooling water supplied from the cooling water supply device 200.

Specifically, the supply system may detect the conductivity value of the cooling water provided by the cooling water supply device 200, specifically, the conductivity value of the cooling water is detected by the conductivity meter 210 provided on the cooling water supply device 200, and the content of calcium and magnesium ions in the cooling water provided by the cooling water supply device 200 may be determined by the conductivity value, that is, whether the cooling water provided by the cooling water supply device 200 meets the usage requirement of the gas turbine may be determined. Alternatively, this step may be performed before the step S100, or may be performed after the step S100, which is not limited to the order of the steps in the embodiment of the present application.

And S400, controlling the cooling water supply device 200 to be in a non-working state under the condition that the conductivity value is larger than a preset conductivity threshold value.

Specifically, in one embodiment, when the conductivity value detected by the conductivity meter 210 is greater than the preset conductivity threshold value, the control device of the supply system may still control the cooling water supply device 200 to be in an operating state, that is, the cooling water supply device 200 is in a state of supplying cooling water to the combustion chamber.

In another embodiment, when the conductivity value detected by the conductivity meter 210 is greater than the preset conductivity threshold, it indicates that the content of calcium and magnesium plasma in the cooling water provided by the cooling water supply device 200 is high, that is, the cooling water does not meet the usage requirement of the gas turbine, at this time, the control device of the supply system may control the cooling water supply device 200 to be in a non-working state, that is, control the cooling water supply device 200 to stop providing the cooling water to the combustion chamber, so as to avoid the cooling water with high content of calcium and magnesium plasma passing through the nozzle of the water pipe 400, and generate dirt at the nozzle to seal the nozzle, that is, avoid affecting the water supply efficiency of the cooling water supply device 200 and the cooling efficiency of the cooling water to the combustion chamber. Alternatively, this step may be performed before the step S100 described above, or performed after the step S100, and the order of the steps is not limited in the embodiment of the present application.

Optionally, the control method of the supply system further includes:

s500, acquiring a temperature value of the combustion chamber.

Specifically, the method and the device can judge whether the combustion chamber needs cooling water to reduce the temperature by acquiring the temperature value of the combustion chamber, so that the emission of pollutants is reduced.

S600, when the temperature value is greater than the temperature preset threshold value, the cooling water supply device 200 is controlled to be in an operating state.

Specifically, in an embodiment, in a case where the temperature value is smaller than the temperature preset threshold value, that is, in a case where the gas turbine is in a just started state, the temperature in the combustion chamber is in a low temperature state, at this time, the control device of the supply system may control the cooling water supply device 200 to be in an operating state, that is, at this time, the cooling water supply device 200 supplies cooling water to the combustion chamber.

In another embodiment, after the gas turbine is started for a period of time, that is, when the temperature value is greater than the temperature preset threshold, the temperature of the combustion chamber reaches the temperature preset threshold, which needs to be cooled by water injection, and the pollutants generated in the combustion chamber are more, at this time, the control device of the supply system may control the cooling water supply device 200 to be in an operating state, that is, control the cooling water supply device 200 to start injecting cooling water into the combustion chamber. Therefore, the arrangement mode can avoid the waste of cooling water under the condition of not influencing the normal starting of the gas turbine.

S700, acquiring a preset ratio of total quantity of cooling water and fuel gas of the combustion chamber and a first total quantity of fuel gas entering the combustion chamber.

Specifically, the supply system may acquire a total preset ratio of cooling water to gas of the combustion chamber, which is a ratio of an amount of cooling water to an amount of gas when the content of pollutants generated in the combustion chamber satisfies the minimum discharge requirement, and a first total amount of gas entering the combustion chamber, which may be acquired through the metering valve 110 of the gas supply apparatus 100, and may vary with a variation in load. For example, the gas turbine has a first amount of gas entering the combustor less when in the just-started phase; the first total amount of the gas entering the combustion chamber is gradually increased when the gas turbine is in a normal operation stage, and gradually decreased when the gas turbine is in a stop operation stage until the gas turbine stops entering the combustion chamber.

S800, adjusting the rotation speed of the motor 230 of the cooling water supply device 200 according to the preset total amount ratio and the first total amount to adjust the rotation speed of the water injection pump 220 of the cooling water supply device 200.

Specifically, the supply system may calculate the amount of cooling water required by the combustion chamber according to the preset total amount ratio and the first total amount, and adjust the rotational speed of the motor 230 of the cooling water supply device 200 to adjust the rotational speed of the water injection pump 220 of the cooling water supply device 200, thereby adjusting the amount of cooling water discharged by the water injection pump 220, so that the amount of cooling water provided by the cooling water supply device 200 matches the amount of cooling water actually required, and the content of pollutants generated in the combustion chamber meets the minimum emission requirement.

Optionally, after adjusting the rotation speed of the motor 230 of the cooling water supply device 200 according to the total preset ratio and the first total amount to adjust the rotation speed of the water injection pump 220 of the cooling water supply device 200, the control method of the supply system further includes:

s910, obtaining a second total amount of cooling water injected into the combustion chamber.

Specifically, in one embodiment, the required amount of cooling water may be obtained only by the preset total amount ratio and the first total amount detected by the metering valve 110, and the rotation speed of the motor 230 is adjusted to adjust the rotation speed of the water injection pump 220 to achieve that the amount of cooling water entering the combustion chamber matches the actually required amount of cooling water.

In another embodiment, to verify whether the amount of cooling water provided by the cooling water supply device 200 truly matches the amount of cooling water actually required, it may be checked whether the amount of cooling water provided by the cooling water supply device 200 satisfies the actually required amount by acquiring a second total amount of cooling water injected into the combustion chamber through the supply system, specifically, by acquiring the second total amount of cooling water injected into the combustion chamber through the flow meter 240 of the cooling water supply device 200.

And S920, when the actual ratio of the second total amount to the first total amount is smaller than or larger than the total amount preset ratio, adjusting the rotation speeds of the motor 230 and the water injection pump 220 so that the actual ratio is equal to the total amount preset ratio.

Specifically, in the case that the actual ratio of the second total amount to the first total amount of the cooling water detected by the flow meter 240 is smaller than the total amount preset ratio, it indicates that the amount of the cooling water supplied from the cooling water supply device 200 is too small, that is, the cooling water cannot play a role in reducing pollutant emissions at this time; in the case that the actual ratio of the second total amount to the first total amount of the cooling water detected by the flow meter 240 is greater than the preset total amount ratio, it indicates that the cooling water supplied from the cooling water supply device 200 is too much, that is, the efficiency and the lifetime of the gas turbine are reduced, and that too much water consumption increases the cost, in which case the rotation speeds of the motor 230 and the water injection pump 220 may be continuously adjusted to adjust the amount of the cooling water discharged from the water injection pump 220 so that the actual ratio is equal to the preset total amount ratio.

In this embodiment, by comparing the actual ratio with the total preset ratio in real time, it may be determined whether the amount of cooling water provided by the cooling water supply device 200 matches the amount of cooling water actually required, that is, whether the amount of cooling water provided by the cooling water supply device 200 meets the requirement, and in the case that the amount of cooling water does not meet the requirement, the rotation speeds of the motor 230 and the water injection pump 220 may be continuously adjusted to adjust the amount of cooling water discharged by the water injection pump 220 until the amount of cooling water provided by the cooling water supply device 200 matches the amount of cooling water actually required.

In the embodiments described above, the differences between the embodiments are mainly described, and as long as there is no contradiction between the different optimization features between the embodiments, the different optimization features may be combined to form a better embodiment, and in consideration of brevity of line text, the description is omitted here.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (13)

1. A supply system for communication with a combustion chamber of a gas turbine, characterized in that the supply system comprises a gas supply device (100), a cooling water supply device (200) and a gas purge device (300),

the fuel gas supply device (100) is provided with a fuel gas inlet (101), a first fuel gas outlet (102) and a second fuel gas outlet (103) which are communicated, wherein the first fuel gas outlet (102) is used for being communicated with the combustion chamber;

the cooling water supply device (200) is provided with a water supply port (201) and a water discharge port (202) which are communicated, the water discharge port (202) is used for being communicated with the combustion chamber through a water pipe (400) of the gas turbine, and the gas purging device (300) can be communicated with the second gas outlet (103) and the water pipe (400) under the condition that the cooling water supply device (200) is in a non-working state.

2. The supply system according to claim 1, characterized in that the cooling water supply device (200) is provided with a conductivity meter (210), the conductivity meter (210) being arranged between the water supply opening (201) and the water discharge opening (202) for detecting a conductivity value of the cooling water, in case the conductivity value is greater than a preset conductivity threshold value, the gas purging device (300) communicates the second gas outlet (103) with the water duct (400).

3. The supply system according to claim 1, characterized in that the gas supply device (100) is provided with a metering valve (110), the metering valve (110) being communicable with the gas inlet (101) and the first gas outlet (102) and the second gas outlet (103), and the metering valve (110) being adapted to control a first total amount of gas entering the combustion chamber;

the cooling water supply device (200) comprises a water injection pump (220) and a motor (230), wherein the water injection pump (220) can be communicated with the water supply port (201) and the water discharge port (202), the water injection pump (220) is connected with the motor (230), and the motor (230) is used for adjusting the rotating speed of the water injection pump (220) according to the total preset ratio of cooling water to fuel gas and the first total amount so as to adjust the second total amount of cooling water injected into the combustion chamber.

4. A supply system according to claim 3, characterized in that the cooling water supply device (200) further comprises a flow meter (240), the flow meter (240) being arranged between the water injection pump (220) and the water discharge opening (202) for detecting the second total amount.

5. The supply system according to claim 1, characterized in that the cooling water supply device (200) is provided with a first one-way valve (250), the first one-way valve (250) being provided between the water supply port (201) and the water discharge port (202).

6. The supply system according to claim 1, wherein the gas purging device (300) includes a gas pipe (310), a first solenoid valve (320) and a second check valve (330), one end of the gas pipe (310) is communicated with the second gas outlet (103), the other end of the gas pipe (310) is communicated with the water pipe (400), the first solenoid valve (320) and the second check valve (330) are both provided on the gas pipe (310), and the second check valve (330) is provided on a side of the first solenoid valve (320) close to the water pipe (400).

7. The supply system according to claim 6, characterized in that the cooling water supply device (200) is provided with a first shut-off valve (260), the first shut-off valve (260) being provided between the water supply port (201) and the water discharge port (202), and the first shut-off valve (260) being provided close to the water discharge port (202).

8. The supply system according to claim 7, further comprising a control device in communication with the first shut-off valve (260) and the first solenoid valve (320), the control device controlling the first solenoid valve (320) to be in a non-operational state with the first shut-off valve (260) in an operational state, and the control device controlling the first shut-off valve (260) to be in a non-operational state with the first solenoid valve (320) in an operational state.

9. A combustion apparatus comprising the supply system of any one of claims 1 to 8 for communication with the combustion chamber of the gas turbine and the gas turbine.

10. A control method of a supply system, applied to the supply system according to any one of claims 1 to 8, characterized by comprising:

detecting an operating state of the cooling water supply device (200);

and under the condition that the cooling water supply device (200) is in a non-working state, controlling the gas purging device (300) to communicate the second gas outlet (103) with the water delivery pipe (400).

11. The method according to claim 10, wherein the method further comprises:

detecting a conductivity value of the cooling water supplied from the cooling water supply device (200);

and controlling the cooling water supply device (200) to be in a non-working state under the condition that the conductivity value is larger than a preset conductivity threshold value.

12. The method according to claim 10, wherein the method further comprises:

acquiring a temperature value of the combustion chamber;

controlling the cooling water supply device (200) to be in an operating state under the condition that the temperature value is larger than a temperature preset threshold value;

acquiring a preset ratio of the total amount of cooling water and fuel gas of the combustion chamber to a first total amount of fuel gas entering the combustion chamber;

and adjusting the rotating speed of a motor (230) of the cooling water supply device (200) according to the preset total amount ratio and the first total amount to adjust the rotating speed of a water injection pump (220) of the cooling water supply device (200).

13. The method according to claim 12, wherein after said adjusting the rotational speed of the motor (230) of the cooling water supply device (200) according to the preset ratio of the total amount and the first total amount to adjust the rotational speed of the water injection pump (220) of the cooling water supply device (200), the method further comprises:

obtaining a second total amount of cooling water injected into the combustion chamber;

and when the actual ratio of the second total amount to the first total amount is smaller than or larger than the total amount preset ratio, adjusting the rotating speeds of the motor (230) and the water injection pump (220) so that the actual ratio is equal to the total amount preset ratio.

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