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

Abstract

The present application discloses a supply system, a combustion device, and a control method for the supply system, belonging to the technical field of environmental protection. The disclosed supply system is used to communicate with the combustion chamber of a gas turbine. The supply system includes a gas supply device, a cooling water supply device, and a gas purging device. The gas supply device has a gas inlet, a first gas outlet, and a second gas outlet that are connected in communication. The first gas outlet is used to communicate with the combustion chamber. The cooling water supply device has a water supply port and a drain port that are connected in communication. The drain port is used to communicate with the combustion chamber through the water delivery pipe of the gas turbine. In the case where the cooling water supply device is in a non-operating state, the gas purging device can connect the second gas outlet and the water delivery pipe. The above solution can solve the problem that the cooling water supply device of the supply system in the related art is likely to affect the working performance of the gas turbine.

Description

Technical Field

[0001] This application belongs to the technical field of environmental protection, and particularly relates to a supply system, a combustion device, and a control method for the supply system. Background Art

[0002] Gas turbines are often used in scenarios such as power generation and wellsite fracturing. Generally, a supply system is used to supply the required gas to the combustion chamber of the gas turbine. When the gas turbine is operating, the main pollutants emitted by its combustion are nitrogen oxides. To reduce the content of nitrogen oxides, common technical methods include injecting water into the combustion chamber of the gas turbine, steam technology, dry low-emission technology, and selective catalytic reduction technology, etc.

[0003] Regarding the technical method of injecting water into the combustion chamber, it mainly uses the cooling water provided by the cooling water supply device of the supply system to absorb the heat of the combustion chamber and then reduce the temperature of the combustion flame, thereby reducing the formation of nitrogen oxides after combustion. At the same time, the ratio of the water injection volume to the gas volume used by the gas turbine is very important for controlling the emission of nitrogen oxides. An excessive water injection volume to gas volume ratio will reduce the efficiency and lifespan of the gas turbine, and too much water consumption will also increase costs. A too small water injection volume to gas volume ratio cannot play a role in reducing pollutant emissions, and as the load changes, the required water injection volume to gas volume ratio of the gas turbine is also dynamically changing. Therefore, it is necessary to adjust the water injection volume in real time to adapt to the change in gas volume.

[0004] However, due to the relatively high content of calcium and magnesium ions in the cooling water provided by the cooling water supply device, and the long-term contact between the cooling water and the nozzle for spraying water into the combustion chamber will cause the nozzle to scale, thereby blocking the nozzle, and then it is relatively difficult for the cooling water to enter the combustion chamber, which is likely to affect the working performance of the gas turbine. It can be seen from this that the cooling water supply device of the supply system involved in the related technology has the problem of being likely to affect the working performance of the gas turbine. Summary of the Invention

[0005] This application discloses a supply system, a combustion device, and a control method for the supply system to solve the problem that the cooling water supply device of the supply system involved in the related technology is likely to affect the working performance of the gas turbine.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] A supply system for communicating with the combustion chamber of a gas turbine, the supply system includes a gas supply device, a cooling water supply device, and a gas purging device.

[0008] The gas supply device has a gas inlet, a first gas outlet, and a second gas outlet that are connected in communication, and the first gas outlet is used to communicate with the combustion chamber.

[0009] The cooling water supply device has a water supply port and a drain port that are connected and communicated. The drain port is used to communicate with the combustion chamber through the water delivery pipe of the gas turbine. When the cooling water supply device is in a non-operating state, the gas purging device can communicate the second gas outlet and the water delivery pipe.

[0010] A combustion device includes the supply system described above and the gas turbine, and the supply system is used to communicate with the combustion chamber of the gas turbine.

[0011] A control method for a supply system is applied to the supply system described above. The control method for the supply system includes:

[0012] Detect the operating state of the cooling water supply device;

[0013] When the cooling water supply device is in a non-operating state, control the gas purging device to communicate the second gas outlet and the water delivery pipe.

[0014] The technical solution adopted in this application can achieve the following beneficial effects:

[0015] In this application, the gas supply device and the cooling water supply device of the supply system can supply gas and cooling water to the combustion chamber of the gas turbine. And when the cooling water supply device is in a non-operating state, the gas purging device can communicate the second gas outlet of the gas supply device and the water delivery pipe of the gas turbine, that is, the gas provided by the gas supply device can flow through the second gas outlet to the gas purging device and the water delivery pipe in sequence. At this time, the high-pressure gas can purge the residual water inside the water delivery pipe and the precipitates after evaporation, thereby purifying the water delivery pipe, and further avoiding the blockage of the nozzle for supplying water to the gas turbine by the precipitates, and further avoiding the phenomenon that the cooling water is not easily introduced into the combustion chamber, and further avoiding affecting the working performance of the gas turbine. Therefore, the supply system disclosed in this application can solve the problem that the cooling water supply device of the supply system in the related art is likely to affect the working performance of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic connection structure diagram of the supply system and the water delivery pipe of the gas turbine disclosed in the embodiment of this application;

[0017] Figure 2 It is a schematic structure diagram of the gas supply device disclosed in the embodiment of this application;

[0018] Figure 3 It is a schematic structure diagram of the cooling water supply device disclosed in the embodiment of this application;

[0019] Figure 4Schematic structural diagram of the second shut-off valve and the third shut-off valve disclosed in the embodiments of the present application;

[0020] Figure 5 Schematic flow diagram of the control method for the supply system disclosed in the embodiments of the present application.

[0021] Explanation of reference numerals:

[0022] 100 - Gas supply device, 101 - Gas inlet, 102 - First gas outlet, 103 - Second gas outlet, 110 - Metering valve, 120 - First ball valve, 130 - First detector, 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 - Closed position switch, 165 - Open position switch, 170 - Third shut-off valve, 171 - Instrument control area, 180 - Flame arrester, 181 - Safety discharge area, 190 - Second filter;

[0023] 200 - Cooling water supply device, 201 - Water supply port, 202 - Drain port, 210 - Conductivity meter, 220 - Injection pump, 221 - Safety valve, 230 - Motor, 240 - Flow meter, 250 - First check valve, 260 - First shut-off valve, 270 - Second ball valve, 281 - Second detector, 282 - Third detector, 290 - Third filter, 291 - Second differential pressure transmitter;

[0024] 300 - Gas purging device, 310 - Gas pipeline, 320 - First solenoid valve, 330 - Second check valve;

[0025] 400 - Water pipeline. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the present application clearer, 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. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0027] The supply system disclosed in the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0028] Please refer to Figures 1 to 5 , the present application discloses a supply system, and the disclosed supply system includes a gas supply device 100, a cooling water supply device 200, and a gas purging device 300.

[0029] The supply system disclosed in this application can be used to communicate with the combustion chamber of a gas turbine to supply fuel gas and cooling water to the combustion chamber. The cooling water is used to reduce the temperature of the combustion chamber to ensure the normal operation of the gas turbine. At the same time, the cooling water reduces the formation of nitrogen oxides after fuel gas combustion by reducing the temperature of the combustion chamber, thereby achieving the purpose of environmental protection.

[0030] Specifically, the fuel gas supply device 100 is the main component for the supply system to supply fuel gas to the combustion chamber. The fuel gas supply device 100 has a fuel gas inlet 101, a first fuel gas outlet 102, and a second fuel gas outlet 103 that are connected. That is, the fuel gas passing through the fuel gas inlet 101 can flow to the first fuel gas outlet 102 and the second fuel gas outlet 103 respectively, and the first fuel gas outlet 102 is used to communicate with the combustion chamber so that the fuel gas can smoothly enter the combustion chamber.

[0031] The cooling water supply device 200 is the main component for the supply system to supply cooling water to the combustion chamber. The cooling water supply device 200 has a water supply port 201 and a drain port 202 that are connected. The drain port 202 is used to communicate with the combustion chamber through the water delivery pipe 400 of the gas turbine. That is, the cooling water passing through the water supply port 201 can flow to the drain port 202 and flow into the water delivery pipe 400 of the gas turbine through the drain port 202. Nozzles are provided on the water delivery pipe 400, and the nozzles can spray the cooling water into the combustion chamber.

[0032] The fuel gas purging device 300 can be used to introduce the fuel gas provided by the fuel gas supply device 100 into the water delivery pipe 400. Specifically, when the cooling water supply device 200 is in a non-operating state, the fuel gas purging device 300 can connect the second fuel gas outlet 103 and the water delivery pipe 400. At this time, since the cooling water supply device 200 is in a non-operating state, there may be a small amount of residual cooling water and evaporated sediment in the water delivery pipe 400. To prevent the sediment from clogging the nozzles, the fuel gas purging device 300 can be put into operation. That is, the fuel gas purging device 300 transports the high-pressure fuel gas at the second fuel gas outlet 103 into the water delivery pipe 400 to purge the residual water and the evaporated sediment. The residual water and the evaporated sediment can easily enter the combustion chamber through the nozzles under the purging action of the high-pressure fuel gas, thereby achieving the purpose of purifying the water delivery pipe 400.

[0033] In this application, the gas supply device 100 and the cooling water supply device 200 of the supply system can supply gas and cooling water to the combustion chamber of the gas turbine. When the cooling water supply device 200 is in a non-operating state, the gas purging device 300 can connect the second gas outlet 103 of the gas supply device 100 and the water delivery pipe 400 of the gas turbine. That is, the gas provided by the gas supply device 100 can flow through the second gas outlet 103 to the gas purging device 300 and the water delivery pipe 400 in sequence. At this time, the high-pressure gas can purge the residual water and evaporated sediment inside the water delivery pipe 400, thereby purifying the water delivery pipe 400, further avoiding the blockage of the nozzle for supplying water to the gas turbine in the water delivery pipe 400, further avoiding the phenomenon that the cooling water is not easily introduced into the combustion chamber, and further avoiding affecting the working performance of the gas turbine. Therefore, the supply system disclosed in this application can solve the problem that the cooling water supply device 200 of the supply system involved in the related art is likely to affect the working performance of the gas turbine.

[0034] In one embodiment, the cooling water provided by the cooling water supply device 200 to the combustion chamber can directly enter the water delivery pipe 400 through the drain port 202. In another embodiment, since the cooling water may contain more calcium, magnesium and other ions, after the cooling water is in contact with the nozzle on the water delivery pipe 400 for a long time, the nozzle will scale, thereby blocking the nozzle, which is likely to affect the performance of the gas turbine. Therefore, the cooling water supply device 200 can be provided with a conductivity meter 210. The conductivity meter 210 is arranged between the water supply port 201 and the drain port 202 to detect the conductivity value of the cooling water. When the conductivity value is greater than the preset conductivity threshold, it indicates that the cooling water contains more calcium, magnesium and other ions, that is, the cooling water does not meet the standard. At this time, the cooling water supply device 200 can be stopped from supplying water, that is, the cooling water supply device 200 is in a non-operating state, and the gas purging device 300 is connected to the second gas outlet 103 and the water delivery pipe 400 to purge and purify the water delivery pipe 400, thereby avoiding the blockage of the nozzle.

[0035] Optionally, the cooling water supply device 200 can include a centrifugal pump. The centrifugal pump can be connected to the water supply port 201 and the drain port 202, and the centrifugal pump can be used to adjust the second total amount of the cooling water entering the combustion chamber through the water delivery pipe 400.

[0036] In another embodiment, the gas supply device 100 is provided with a metering valve 110. The metering valve 110 can communicate with the gas inlet 101, the first gas outlet 102 and the second gas outlet 103, and the metering valve 110 is used to control the first total amount of gas entering the combustion chamber, that is, the metering valve 110 controls the first total amount through its valve opening degree, and the valve opening degree 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 can communicate with the water supply port 201 and the drain port 202. The water injection pump 220 is connected to the motor 230, and the motor 230 is used to adjust the rotation speed of the water injection pump 220 according to the preset ratio of the total amount of cooling water and gas and the first total amount, that is, the motor 230 can adjust the rotation speed of the water injection pump 220 to adjust the discharge flow of the water injection pump 220, and further adjust the second total amount of cooling water injected into the combustion chamber.

[0037] In this embodiment, since the rotation speed of the motor 230, the preset ratio of the total amount, the first total amount, and the second total amount of cooling water required by the combustion chamber are adapted to each other, this makes the second total amount of cooling water provided by the cooling water supply device 200 more matched with the actual demand. Compared with the scheme using a centrifugal pump, the scheme of the water injection pump 220 and the motor 230 adopted in this application has the advantage of a larger flow regulation range. At the same time, the water injection pump 220 can reach a higher water injection pressure compared with the centrifugal pump, and thus the applicable working condition range of this setting method is also wider.

[0038] Optionally, the water injection pump 220 can be a positive displacement pump, specifically, it can be a gear pump, a plunger pump, a vane pump or other types of pumps. The motor 230 can be a variable frequency motor. By changing the rotation speed of the motor 230 through variable frequency speed regulation technology, the discharge flow of the water injection pump 220 is changed to reach the amount of cooling water required by the combustion chamber. At the same time, since the second total amount of cooling water provided by the cooling water supply device 200 is more matched with the actual demand, the power loss of the water injection pump 220 and the motor 230 is smaller, and the content of pollutants discharged from the combustion chamber can also meet the requirements of low pollutant emissions.

[0039] Optionally, the cooling water supply device 200 can further include a safety valve 221. The safety valve 221 is arranged at both ends of the water injection pump 220 to limit the water injection pressure of the water injection pump 220, so as to protect the use safety of the cooling water supply device 200.

[0040] Optionally, the cooling water supply device 200 may further include a second detector 281 disposed between the water supply port 201 and the injection water pump 220 for detecting at least one of the first pressure value and the first temperature value of the cooling water entering the injection water pump 220. That is, 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, the second detector 281 can determine whether the starting condition of the injection water pump 220 is met, so as to prevent problems such as excessive leakage or seal damage of the injection water pump 220.

[0041] Optionally, the cooling water supply device 200 may further include a third detector 282 disposed between the injection water pump 220 and the drain port 202 for detecting at least one of the second pressure value and the second temperature value of the cooling water entering the combustion chamber. That is, by detecting at least one of the second pressure value and the second temperature value of the cooling water discharged by the injection water pump 220, the third detector 282 can determine whether the pressure and temperature of the cooling water after being discharged by the injection water pump 220 meet the water injection temperature requirement and pressure requirement of the gas turbine, so as to ensure the cooling efficiency of the cooling water provided by the cooling water supply device 200 for the combustion chamber.

[0042] Optionally, the cooling water supply device 200 may further include a third filter 290 disposed between the injection water pump 220 and the drain port 202 for filtering the high-pressure cooling water discharged by the injection water 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 many advantages such as good filtering effect, good sealing performance, strong flow capacity and simple operation.

[0043] Optionally, since the impurities filtered by the third filter 290 will accumulate on the filter element, as the service time of the third filter 290 becomes longer and longer, the impurities on the filter element will become more and more, and the amount of cooling water passing through the third filter 290 will gradually decrease. At this time, a large pressure difference will be generated at both ends of the third filter 290, which is likely to affect the service life of the filter element and further affect the filtering effect of the third filter 290. To monitor the pressure difference at both ends of the third filter 290 in real time, the cooling water supply device 200 may further include a second differential pressure transmitter 291 disposed at both ends of the third filter 290 for detecting the pressure difference at both ends of the third filter 290 in real time. When the detected pressure difference value rises to a certain level, the filter element needs to be replaced in time to avoid affecting the filtering effect of the third filter 290.

[0044] Optionally, the present application can calculate the second total amount of cooling water required through the preset ratio of the total amount of cooling water to gas and the first total amount of gas entering the combustion chamber, so that the cooling water provided by the cooling water supply device 200 is more matched with the actual demand.

[0045] In another embodiment, to make the cooling water supplied by the cooling water supply device 200 more matched with the actual demand, the cooling water supply device 200 further includes a flowmeter 240. The flowmeter 240 is arranged between the water injection pump 220 and the drain port 202 for detecting the second total amount, that is, the second total amount of the cooling water supplied by the cooling water supply device 200 can be detected through the flowmeter 240, so as to check and judge whether the amount of the cooling water supplied by the cooling water supply device 200 meets the actual demand, thereby achieving the purpose of making the cooling water supplied by the cooling water supply device 200 more matched with the actual demand.

[0046] Optionally, after the gas enters the water delivery pipe 400 through the gas purging device 300, most of the gas purges the water delivery pipe 400 and then enters the combustion chamber. Since the water delivery pipe 400 is connected to the drain port 202, therefore, a small part of the gas may move towards the cooling water supply device 200.

[0047] In another embodiment, the cooling water supply device 200 is provided with a first one-way valve 250. The first one-way valve 250 is arranged between the water supply port 201 and the drain port 202, that is, the cooling water passing through the water supply port 201 can flow to the drain port 202 through the first one-way valve 250, but the cooling water at the drain port 202 cannot flow to the water supply port 201 through the first one-way valve 250. At this time, the gas also cannot enter the cooling water supply device 200 through the first one-way valve 250, which can protect other components of the cooling water supply device 200 to a certain extent to ensure that the cooling water supply device 200 can work normally. At the same time, the first one-way valve 250 can also avoid the phenomenon of mixing of the cooling water and the gas.

[0048] Optionally, the gas purging device 300 may include a gas delivery pipe 310 and a first electromagnetic valve 320. One end of the gas delivery pipe 310 is connected to the second gas outlet 103, and the other end of the gas delivery pipe 310 is connected to the water delivery pipe 400. The first electromagnetic valve 320 is arranged on the gas delivery pipe 310. Opening the first electromagnetic valve 320 can connect the second gas outlet 103 with the water delivery pipe 400 to purge and purify the water delivery pipe 400, and closing the first electromagnetic valve 320 can disconnect the second gas outlet 103 from the water delivery pipe 400.

[0049] In another embodiment, the gas purging device 300 may further include a second check valve 330. Both the first solenoid valve 320 and the second check valve 330 are provided in the gas pipeline 310, and the second check valve 330 is provided on the side of the first solenoid valve 320 closer to the water pipeline 400, that is, the second check valve 330 is arranged closer to the water pipeline 400 than the first solenoid valve 320. The gas can flow through the second check valve 330 to the water pipeline 400, but the cooling water in the water pipeline 400 cannot flow through the second check valve 330 to the first solenoid valve 320. To a certain extent, this can protect the first solenoid valve 320 to ensure its normal operation. At the same time, the second check valve 330 can also prevent the mixing of the cooling water and the gas.

[0050] Optionally, the cooling water supply device 200 is provided with a first shut-off valve 260. The first shut-off valve 260 is arranged between the water supply port 201 and the drain port 202. The first shut-off valve 260 can be arranged close to the water supply port 201. Opening the first shut-off valve 260 allows the cooling water to enter the water pipeline 400, and closing the first shut-off valve 260 stops the cooling water supply device 200 from supplying water to the combustion chamber.

[0051] In another embodiment, to enable the cooling water supply device 200 to stop supplying water to the combustion chamber more promptly, the first shut-off valve 260 can be arranged close to the drain port 202, that is, the first shut-off valve 260 is closer to the water pipeline 400. At this time, closing the first shut-off valve 260 can immediately stop supplying water to the water pipeline 400, and thus can stop supplying water to the combustion chamber more promptly, thereby avoiding wasting cooling water.

[0052] Optionally, the supply system may further include a control device. The control device is communicatively connected to the first shut-off valve 260 and the first solenoid valve 320. The control device can control the first shut-off valve 260 and the first solenoid valve 320 to be in the working state simultaneously, that is, the cooling water and the gas can enter the water pipeline 400 simultaneously.

[0053] In another embodiment, the first shut-off valve 260 and the first solenoid valve 320 may not be in the working state simultaneously. That is, when the first shut-off valve 260 is in the working state, the control device can control the first solenoid valve 320 to be in the non-working state, and when the first solenoid 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 gas and the cooling water do not enter the water pipeline 400 simultaneously, that is, the gas and the cooling water do not mix in the water pipeline 400. To a certain extent, this can ensure the cooling effect of the cooling water and ensure the normal operation of the gas turbine.

[0054] Optionally, the gas supply device 100 may be provided with a first ball valve 120 at the gas inlet 101. Opening the first ball valve 120 allows gas to enter the gas supply device 100, enabling the gas supply device 100 to stably supply gas to the combustion chamber.

[0055] Optionally, the cooling water supply device 200 may be provided with a second ball valve 270 at the water supply port 201. Opening the second ball valve 270 allows cooling water to enter the cooling water supply device 200, enabling the cooling water supply device 200 to stably supply cooling water to the combustion chamber.

[0056] Optionally, the gas supply device 100 may further include a first detector 130. The first detector 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 the third pressure value and the third temperature value of the gas entering the combustion chamber. That is, by detecting at least one of the third pressure value and the third temperature value of the gas at the gas inlet 101, the first detector 130 can determine whether the pressure and temperature of the gas meet the starting conditions of the gas turbine. If at least one of the third pressure value and the third temperature value does not meet the starting conditions, the gas turbine is not allowed to start. At the same time, if during the operation of the gas turbine, at least one of the third pressure value and the third temperature value detected by the first detector 130 does not meet the requirements, the gas turbine needs to stop working at this time.

[0057] Optionally, the gas supply device 100 may further include a first filter 140. The first filter 140 may be disposed close to the gas inlet 101 to preliminarily filter the gas.

[0058] In a further embodiment, the gas supply device 100 may further include a second filter 190. The second filter 190 may be disposed close to 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 to filter particles of the first size, and the second filter 190 is used to filter particles of the second size. The first size may be larger than the second size. That is, after the gas is preliminarily filtered by the first filter 140, the moisture and larger solid particles carried in the gas can be filtered out. After the gas is further filtered by the second filter 190, the finer particles in the gas can be removed, making the gas more compliant with the operating conditions of the gas turbine.

[0059] Optionally, the impurities filtered by the first filter 140 will accumulate on the filter element. As the usage time of the first filter 140 increases, more and more impurities will accumulate on the filter element, and the amount of gas passing through the first filter 140 will gradually decrease. At this time, a large pressure difference will be generated between the two ends of the first filter 140, which is likely to affect the service life of the filter element and thus easily affect the filtering effect of the first filter 140. To monitor the pressure difference between the two ends of the first filter 140 in real time, the gas supply device 100 may further include a first differential pressure transmitter 150. The first differential pressure transmitter 150 is disposed at the two ends of the first filter 140 to detect the pressure difference between the two ends of the first filter 140 in real time. When the detected pressure difference rises to a certain level, the filter element needs to be replaced in time to avoid affecting the filtering effect of the first filter 140.

[0060] Furthermore, a third differential pressure transmitter may also be provided at the two ends of the second filter 190 to detect the pressure difference between the two ends of the second filter 190 in real time. When the detected pressure difference rises to a certain level, the filter element is replaced in time to avoid affecting the filtering effect of the second filter 190.

[0061] Optionally, the gas supply device 100 may further include a second shut-off valve 160. The second shut-off valve 160 is disposed between the gas inlet 101, the first gas outlet 102, and the second gas outlet 103. Opening the second shut-off valve 160 allows gas to enter the combustion chamber through the first gas outlet 102, and closing the second shut-off valve 160 can cause the gas supply device 100 to quickly stop supplying gas to the combustion chamber.

[0062] 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 has an inlet, an outlet, and a bleed port. The inlet is connected to the gas inlet 101, the outlet is connected to the first gas outlet 102 and the second gas outlet 103, and the bleed port is connected to the safety discharge area 181. The shut-off valve body 163 is equivalent to a three-way reversing valve. The piston 162 can operate under the action of the second solenoid valve 161, that is, the piston 162 can push the valve core of the shut-off valve body 163 to block the inlet so that the outlet and the bleed port are connected, or the piston 162 can push the valve core to block the bleed port so that the inlet and the outlet are connected.

[0063] When the second solenoid valve 161 receives the starting signal of the gas turbine, under the action of the instrument control area 171, the second solenoid valve 161 drives the piston 162 to operate, so that the piston 162 pushes the valve core to block the relief port, and then the inlet and outlet of the shut-off valve body 163 are connected, and further the gas inlet 101 is connected to the first gas outlet 102 and the second gas outlet 103; when the second solenoid valve 161 receives the shutdown signal of the gas turbine, under the action of the instrument control area 171, the second solenoid valve 161 drives the piston 162 to operate, so that the piston 162 pushes the valve core to block the inlet, and then the relief port of the shut-off valve body 163 is connected to the outlet. At this time, the supply of gas to the combustion chamber can be quickly stopped. At the same time, the residual gas between the outlet and the first gas outlet 102 and the second gas outlet 103 can flow through the outlet to the relief port, and then be discharged to the safe discharge area 181 through the relief port, so that the gas turbine can quickly shut down.

[0064] Optionally, a flame arrester 180 can be provided between the relief port and the safe discharge area 181. The flame arrester 180 can prevent gas from burning in the gas supply device 100, thereby protecting the gas supply device 100.

[0065] Optionally, the second shut-off valve 160 can further include a closed position switch 164 and an open position switch 165. The valve state of the second shut-off valve 160 can be signaled back by the closed position switch 164 and the open position switch 165. The opening state of the shut-off valve body 163 can be detected in real time through the closed position switch 164 and the open position switch 165, avoiding abnormal shutdown caused by unknown failure of the second shut-off valve 160. Specifically, when the piston 162 pushes the valve core to move to the corresponding position, the closed position switch 164 and the open position switch 165 can detect the signal and send out relevant signals, so as to judge whether the second shut-off valve 160 is opened or closed in place.

[0066] Furthermore, the gas supply device 100 can further include a third shut-off valve 170. The third shut-off valve 170 is arranged 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 arranged in sequence, and the structures and functions of the second shut-off valve 160 and the third shut-off valve 170 can be the same. It can be seen that the double-stage shut-off valve composed of the second shut-off valve 160 and the third shut-off valve 170 in this application can play a dual protection role, that is, it can prevent the phenomenon that the emergency shut-off fails after the shutdown signal is given due to the failure of a single shut-off valve, and the gas supply cannot be stopped in time.

[0067] Optionally, this application also discloses a combustion device, including the supply system and the gas turbine described above. The supply system is used to communicate with the combustion chamber of the gas turbine to supply gas and cooling water to the combustion chamber.

[0068] Optionally, the present application also discloses a control method for a supply system, which is applied to the supply system described above. The control method for the supply system includes:

[0069] S100. Detect the working state of the cooling water supply device 200.

[0070] Specifically, the detection device of the supply system can detect the working 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. When the cooling water supply device 200 is in a non-working state, it indicates that the cooling water supply device 200 does not supply cooling water to the combustion chamber. When the cooling water supply device 200 is in a working state, it indicates that the cooling water supply device 200 is supplying cooling water to the combustion chamber.

[0071] S200. When the cooling water supply device 200 is in a non-working state, control the gas purging device 300 to connect the second gas outlet 103 and the water delivery pipe 400.

[0072] Specifically, when the detection device detects that the cooling water supply device 200 is in a non-working state, it indicates that there is no cooling water flowing in the water delivery pipe 400 of the gas turbine. At this time, the supply system can control the gas purging device 300 to connect the second gas outlet 103 and the water delivery pipe 400. Specifically, the control device of the supply system can control the gas purging device 300 to be in a working state. The gas purging device 300 in the working state can connect the second gas outlet 103 and the water delivery pipe 400, so that the gas provided by the gas supply device 100 can enter the water delivery pipe 400 through the second gas outlet 103 and the gas purging device 300 to purge and purify the water delivery pipe 400.

[0073] In the present application, when it is detected that the cooling water supply device 200 is in a non-working state, the gas purging device 300 can connect the second gas outlet 103 of the gas supply device 100 and the water delivery pipe 400 of the gas turbine, that is, the gas provided by the gas supply device 100 can flow through the second gas outlet 103 to the gas purging device 300 and the water delivery pipe 400 in sequence. At this time, the high-pressure gas can purge the residual water and evaporated sediment inside the water delivery pipe 400, thereby purifying the water delivery pipe 400, further avoiding the sediment from blocking the nozzle of the water delivery pipe 400 that supplies water to the gas turbine, further avoiding the phenomenon that the cooling water is not easily introduced into the combustion chamber, and further avoiding affecting the working performance of the gas turbine. Therefore, the control method for the supply system disclosed in the present application can solve the problem that the cooling water supply device 200 of the supply system involved in the related art is likely to affect the working performance of the gas turbine.

[0074] Optionally, the control method for the supply system further includes:

[0075] S300. Detect the conductivity value of the cooling water provided by the cooling water supply device 200.

[0076] Specifically, the supply system can detect the conductivity value of the cooling water provided by the cooling water supply device 200. Specifically, the conductivity meter 210 provided on the cooling water supply device 200 is used to detect the conductivity value of the cooling water. Through the conductivity value, the content of calcium, magnesium and other ions in the cooling water provided by the cooling water supply device 200 can be judged, that is, it can be judged whether the cooling water provided by the cooling water supply device 200 meets the standard and whether it meets the use requirements of the gas turbine. Optionally, this step can be executed before the above step S100 or after step S100. The embodiments of the present application do not limit the order of each step.

[0077] S400. When the conductivity value is greater than the preset conductivity threshold, control the cooling water supply device 200 to be in a non-operating state.

[0078] Specifically, in one embodiment, when the conductivity value detected by the conductivity meter 210 is greater than the preset conductivity threshold, the control device of the supply system can 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.

[0079] 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, magnesium and other ions in the cooling water provided by the cooling water supply device 200 is relatively high, that is, the cooling water does not meet the standard and does not meet the use requirements of the gas turbine. At this time, the control device of the supply system can control the cooling water supply device 200 to be in a non-operating state, that is, control the cooling water supply device 200 to stop supplying cooling water to the combustion chamber, so as to avoid the generation of dirt at the nozzle of the water delivery pipe 400 when the cooling water containing more calcium and magnesium ions passes through the nozzle, so as to block the nozzle, that is, to avoid affecting the water supply efficiency of the cooling water supply device 200 and the cooling efficiency of the cooling water for the combustion chamber. Optionally, this step can also be executed before the above step S100 or after step S100. The embodiments of the present application do not limit the order of each step.

[0080] Optionally, the control method of the supply system further includes:

[0081] S500. Obtain the temperature value of the combustion chamber.

[0082] Specifically, the present application can judge whether the combustion chamber needs cooling water to reduce the temperature and thus reduce the pollutant emissions by obtaining the temperature value of the combustion chamber.

[0083] S600. When the temperature value is greater than the preset temperature threshold, control the cooling water supply device 200 to be in the working state.

[0084] Specifically, in one embodiment, when the temperature value is less than the preset temperature threshold, that is, when the gas turbine is in the 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 can control the cooling water supply device 200 to be in the working state, that is, at this time, the cooling water supply device 200 provides cooling water to the combustion chamber.

[0085] In another embodiment, after the gas turbine has been started for a period of time, that is, when the temperature value is greater than the preset temperature threshold, it indicates that the temperature in the combustion chamber has reached the preset temperature threshold that requires water injection for cooling, and there are more pollutants generated in the combustion chamber. At this time, the control device of the supply system can control the cooling water supply device 200 to be in the working state, that is, control the cooling water supply device 200 to start injecting cooling water into the combustion chamber. It can be seen that this setting method can avoid wasting cooling water without affecting the normal start of the gas turbine.

[0086] S700. Obtain the total preset ratio of the cooling water and the gas in the combustion chamber and the first total amount of the gas entering the combustion chamber.

[0087] Specifically, the supply system can obtain the total preset ratio of the cooling water and the gas in the combustion chamber and the first total amount of the gas entering the combustion chamber. This total preset ratio is the ratio of the amount of cooling water to the amount of gas when the content of pollutants generated in the combustion chamber meets the minimum emission requirements. The first total amount can be obtained through the metering valve 110 of the gas supply device 100, and the first total amount of the gas entering the combustion chamber can change with the load. For example, when the gas turbine is in the just-started stage, the first total amount of the gas entering the combustion chamber is less; when the gas turbine is in the normal operation stage, the first total amount of the gas entering the combustion chamber gradually increases; when the gas turbine is in the stopped operation stage, the first total amount of the gas entering the combustion chamber gradually decreases until it stops entering the combustion chamber.

[0088] S800. According to the total preset ratio and the first total amount, adjust the rotation speed of the motor 230 of the cooling water supply device 200 to adjust the rotation speed of the water injection pump 220 of the cooling water supply device 200.

[0089] Specifically, the supply system can calculate the amount of cooling water required for the combustion chamber based on the total preset ratio and the first total amount, and adjust the rotational speed of the motor 230 of the cooling water supply device 200 to regulate the rotational speed of the water injection pump 220 of the cooling water supply device 200, thereby regulating 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 actually required amount of cooling water, so that the content of pollutants generated in the combustion chamber meets the minimum emission requirements.

[0090] Optionally, after adjusting the rotational speed of the motor 230 of the cooling water supply device 200 according to the total preset ratio and the first total amount to regulate the rotational speed of the water injection pump 220 of the cooling water supply device 200, the control method of the supply system further includes:

[0091] S910. Obtain the second total amount of cooling water injected into the combustion chamber.

[0092] Specifically, in one embodiment, the required amount of cooling water can be obtained only through the total preset ratio and the first total amount detected by the metering valve 110, and by adjusting the rotational speed of the motor 230 to regulate the rotational speed of the water injection pump 220, the amount of cooling water entering the combustion chamber can be made to match the actually required amount of cooling water.

[0093] In another embodiment, to verify whether the amount of cooling water provided by the cooling water supply device 200 actually matches the actually required amount of cooling water, the supply system can obtain the second total amount of cooling water injected into the combustion chamber. Specifically, the flowmeter 240 of the cooling water supply device 200 can obtain the second total amount of cooling water injected into the combustion chamber to check and determine whether the amount of cooling water provided by the cooling water supply device 200 meets the actual requirements.

[0094] S920. When the actual ratio between the second total amount and the first total amount is less than or greater than the total preset ratio, adjust the rotational speeds of the motor 230 and the water injection pump 220 so that the actual ratio is equal to the total preset ratio.

[0095] Specifically, when the actual ratio between the second total amount of cooling water detected by the flowmeter 240 and the first total amount is less than the total preset ratio, it indicates that the amount of cooling water provided by the cooling water supply device 200 is too small, that is, the cooling water cannot play the role of reducing pollutant emissions at this time; when the actual ratio between the second total amount of cooling water detected by the flowmeter 240 and the first total amount is greater than the total preset ratio, it indicates that the amount of cooling water provided by the cooling water supply device 200 is too much, that is, the efficiency and life of the gas turbine will be reduced at this time, and the excessive water consumption will also increase the cost. In this case, the rotational speeds of the motor 230 and the water injection pump 220 can be continuously adjusted to regulate the amount of cooling water discharged by the water injection pump 220 so that the actual ratio is equal to the total preset ratio.

[0096] In this embodiment, by comparing the actual ratio with the preset total ratio in real time, it can 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, it can be determined whether the amount of cooling water provided by the cooling water supply device 200 meets the requirements. In the case of not meeting the requirements, the rotation speeds of the motor 230 and the water injection pump 220 can be continuously adjusted to regulate 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.

[0097] In the above embodiments of the present application, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0098] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A supply system for communicating with a combustion chamber of a gas turbine, characterized in that, The supply system includes a gas supply device (100), a cooling water supply device (200), and a gas purging device (300). The gas supply device (100) has a gas inlet (101), a first gas outlet (102), and a second gas outlet (103) that are connected and communicated. The first gas outlet (102) is used to communicate with the combustion chamber. The cooling water supply device (200) has a water supply port (201) and a drain port (202) that are connected and communicated. The drain port (202) is used to communicate with the combustion chamber through the water delivery pipe (400) of the gas turbine. When the cooling water supply device (200) is in a non-operating state, the gas purging device (300) can connect the second gas outlet (103) and the water delivery pipe (400).

2. The supply system according to claim 1, wherein The cooling water supply device (200) is provided with a conductivity meter (210). The conductivity meter (210) is arranged between the water supply port (201) and the drain port (202) to detect the conductivity value of the cooling water. When the conductivity value is greater than a preset conductivity threshold, the gas purging device (300) connects the second gas outlet (103) and the water delivery pipe (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) can connect the gas inlet (101) with the first gas outlet (102) and the second gas outlet (103), and the metering valve (110) is used to control the first total amount of gas entering the combustion chamber. The cooling water supply device (200) includes a water injection pump (220) and a motor (230). The water injection pump (220) can connect the water supply port (201) and the drain port (202). The water injection pump (220) is connected to the motor (230), and the motor (230) is used to adjust the rotation speed of the water injection pump (220) according to the preset ratio of the total amount of cooling water to gas and the first total amount, so as to adjust the second total amount of cooling water injected into the combustion chamber.

4. The supply system according to claim 3, wherein The cooling water supply device (200) further includes a flow meter (240). The flow meter (240) is arranged between the water injection pump (220) and the drain port (202) to detect 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 check valve (250). The first check valve (250) is arranged between the water supply port (201) and the drain port (202).

6. The supply system according to claim 1, characterized in that, The gas purging device (300) includes a gas pipeline (310), a first solenoid valve (320) and a second check valve (330). One end of the gas pipeline (310) is communicated with the second gas outlet (103), and the other end of the gas pipeline (310) is communicated with the water pipeline (400). The first solenoid valve (320) and the second check valve (330) are both arranged on the gas pipeline (310), and the second check valve (330) is arranged on the side of the first solenoid valve (320) close to the water pipeline (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) is arranged between the water supply port (201) and the water discharge port (202), and the first shut-off valve (260) is arranged close to the water discharge port (202).

8. The supply system according to claim 7, wherein The supply system further includes a control device. The control device is communicatively connected to the first shut-off valve (260) and the first solenoid valve (320). When the first shut-off valve (260) is in the working state, the control device controls the first solenoid valve (320) to be in the non-working state. When the first solenoid valve (320) is in the working state, the control device controls the first shut-off valve (260) to be in the non-working state.

9. A combustion device, characterized in that, It includes the supply system according to any one of claims 1 to 8 and the gas turbine. The supply system is used to communicate with the combustion chamber of the gas turbine.

10. A control method for a supply system, applied to the supply system according to any one of claims 1 to 8, characterized in that, It includes: Detect the working state of the cooling water supply device (200); When the cooling water supply device (200) is in the non-working state, control the gas purging device (300) to communicate the second gas outlet (103) and the water pipeline (400).

11. The method according to claim 10, wherein The method further includes: Detect the conductivity value of the cooling water provided by the cooling water supply device (200); When the conductivity value is greater than the preset conductivity threshold, control the cooling water supply device (200) to be in the non-working state.

12. The method according to claim 10, wherein The method further includes: Obtain the temperature value of the combustion chamber; When the temperature value is greater than the preset temperature threshold, control the cooling water supply device (200) to be in the working state; Obtain the preset total ratio of the cooling water and the gas in the combustion chamber and the first total amount of the gas entering the combustion chamber; According to the preset total ratio and the first total amount, adjust the rotation speed of the motor (230) of the cooling water supply device (200) to adjust the rotation speed of the water injection pump (220) of the cooling water supply device (200).

13. The method according to claim 12, wherein After adjusting the rotation speed of the motor (230) of the cooling water supply device (200) according to the preset total 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 method further includes: Obtain the second total amount of the cooling water injected into the combustion chamber; In the case where the actual ratio of the second total amount to the first total amount is less than or greater than the preset total amount ratio, adjust the rotational speeds of the motor (230) and the water injection pump (220) so that the actual ratio is equal to the preset total amount ratio.

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