Emission adjustment control method for low-emission combustion chamber of gas turbine

Abstract

The invention relates to an emission adjustment control method for a low-emission combustion chamber of a gas turbine, and relates to the field of gas turbine control. The method comprises the following steps: acquiring feedback parameters; receiving a mode selection signal, wherein the mode selection signal comprises at least one of an automatic control mode signal, a manual open-loop control mode signal and a manual closed-loop control mode signal; determining a target working condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal; and working condition control is conducted on the target combustion chamber based on the target working condition. When emission control adjustment is carried out on an emission chamber of the gas turbine, feedback parameters generated through the current working state of the gas turbine are combined with the current working state of the gas turbine, the target working condition of the target combustion chamber is determined, and then the target combustion chamber is controlled in combination with the target working condition. According to the process, low-emission combustion partition switching and fuel proportion online adjustment are completed under the non-stop condition, and the adjustment efficiency of the working state of the combustion chamber of the gas turbine is improved.

Description

Technical Field

[0001] The present invention relates to the field of low-emission gas turbine control, and particularly to a method for controlling the emission adjustment of a low-nitrogen combustion chamber of a gas turbine. Background Art

[0002] In the field of gas turbine control, low-emission technology has always been an important factor restricting the marketization of domestic gas turbines.

[0003] In related technologies, there is a huge gap between single-tube / single-combustor combustion tests and full-engine tests. During the full-engine state test, factors such as environmental conditions, fuel gas composition, and engine state need to be considered, and corresponding control methods are generated in combination with these factors.

[0004] However, when the low-emission control law designed under laboratory conditions is applied to full-engine tests, due to factors such as environmental conditions, fuel gas composition, and engine state, the emission effect may not be ideal and online adjustment is required. However, the adjustment process is restricted by conditions such as flashback, flameout, and pressure pulsation. Therefore, the emission adjustment control methods in related technologies are not stable. Summary of the Invention

[0005] The present invention relates to a method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine, which can provide efficient and stable control for the low-emission combustion chamber. The method is applied to a computer device and includes: Obtain feedback parameters, where the feedback parameters are parameters associated with the target combustion chamber; Receive a mode selection signal, where the mode selection signal includes at least one of an automatic control mode signal, a manual open-loop control mode signal, and a manual closed-loop control mode signal; Determine a target operating condition corresponding to the target combustion chamber based on the feedback parameters and the mode selection signal; Perform operating condition control on the target combustion chamber based on the target operating condition.

[0006] In an optional embodiment, the feedback parameters include at least one of a given load given parameter and a load feedback parameter.

[0007] In an optional embodiment, in response to the mode selection signal being an automatic control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameters and the mode selection signal includes: Determine a preset power parameter based on the feedback parameters; Determine a fuel distribution strategy based on the preset power parameter; Determine the opening degree of the fuel control valve based on the fuel distribution strategy; Determine a target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel control valve.

[0008] In an alternative embodiment, the number of fuel control valves is three; The fuel distribution strategy indicates the fuel distribution ratio and the fuel distribution time corresponding to the fuel control valve; The fuel configuration strategy corresponds to restricted protection conditions.

[0009] In an alternative embodiment, in response to the mode selection signal being a manual open-loop control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal, including: Determining at least one fuel increase / decrease step size, the fuel increase / decrease step size corresponding to the working area configuration of the target combustion chamber; Determining a fuel increase / decrease result based on the fuel increase / decrease step size; Determining the opening degree of the fuel control valve based on the fuel increase / decrease result; Determining the target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel control valve.

[0010] In an alternative embodiment, the number of fuel increase / decrease step sizes is three.

[0011] In an alternative embodiment, in response to the mode selection signal being a manual closed-loop control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal, including: Determining at least one target operating condition point based on the feedback parameter; Determining a fuel distribution strategy corresponding to the working area of the target combustion chamber based on the operating condition parameters indicated by the target operating condition point; Determining the opening degree of the fuel control valve corresponding to the working area of the target combustion chamber based on the fuel distribution strategy; Determining the target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel control valve.

[0012] In an alternative embodiment, the method further includes: Generating a protection strategy corresponding to the target working chamber based on the working state of the target combustion chamber, the protection strategy including at least one of an alarm protection strategy, a flashback protection strategy, and an air-fuel ratio prediction strategy.

[0013] The beneficial effects brought by the technical solution provided by the present invention at least include: When performing emission control adjustment on the emission chamber of a gas turbine, combining the feedback parameter generated by the current working state of the current gas turbine with the current working state of the gas turbine, and determining the target operating condition of the target combustion chamber, and then controlling the target combustion chamber in combination with the target operating condition. This process completes the low-emission combustion zone switching and online fuel ratio adjustment without shutting down the machine, improving the adjustment efficiency of the working state of the gas turbine combustion chamber. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0015] Figure 1 Fig. 5 shows a schematic flow chart of an emission adjustment control method for a low-emission combustor of a gas turbine provided by an exemplary embodiment of the present invention.

[0016] Figure 2 Fig. 9 shows a schematic flow chart of another emission adjustment control method for a low-emission combustor of a gas turbine provided by an exemplary embodiment of the present invention. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0018] Figure 1 Fig. 18 shows a schematic flow chart of an emission adjustment control method for a low-emission combustor of a gas turbine provided by an exemplary embodiment of the present invention. Taking the application of this method in a computer device as an example, the method includes: Step 101, obtain feedback parameters.

[0019] In the embodiments of the present invention, the computer device can be an industrial control device communicatively connected to the target combustor. Correspondingly, the feedback parameters are parameters associated with the target combustor. Optionally, the feedback parameters are associated with the operating state of the target combustor. In one example, the feedback parameters include the operating parameters of the target combustor and the state parameters of the target combustor.

[0020] Step 102, receive a mode selection signal.

[0021] In the embodiments of the present invention, the mode selection signal includes at least one of an automatic control mode signal, a manual open-loop control mode signal, and a manual closed-loop control mode signal.

[0022] Step 103, determine a target operating condition corresponding to the target combustor based on the feedback parameters and the mode selection signal.

[0023] In the embodiments of the present invention, the target operating condition can indicate at least one operating state of the target combustor. Optionally, the target operating condition corresponds to the opening degree of the fuel control valve of the target combustor.

[0024] Step 104, perform operating condition control on the target combustor based on the target operating condition.

[0025] It should be noted that in the embodiments of the present invention, when performing operating condition control, the computer device usually generates various types of control instructions based on the target operating condition, including control instructions for different working chambers in the target combustion chamber. The process shown in step 104 is the process of performing operating condition control on the control instructions.

[0026] In summary, for the method provided by the embodiments of the present invention, when performing emission control adjustment on the emission chamber of a gas turbine, the feedback parameters generated by the current working state of the gas turbine are combined with the current working state of the gas turbine to determine the target operating condition of the target combustion chamber, and then the target combustion chamber is controlled in combination with the target operating condition. This process completes the low-emission combustion zone switching and online adjustment of the fuel ratio without shutting down the machine, improving the adjustment efficiency of the working state of the gas turbine combustion chamber.

[0027] Figure 2 The flowchart shows another emission adjustment control method for a low-emission combustion chamber of a gas turbine provided by an exemplary embodiment of the present invention. Taking the application of this method in a computer device as an example, the method includes: Step 201, obtain feedback parameters.

[0028] This process corresponds to the process shown in step 101 and will not be elaborated here. It should be noted that the feedback parameters include at least one of the given load given parameter and the load feedback parameter.

[0029] Step 202, receive a mode selection signal.

[0030] Corresponding to step 102, the mode selection signal includes at least one of an automatic control mode signal, a manual open-loop control mode signal, and a manual closed-loop control mode signal.

[0031] Step 203, in response to the mode selection signal being an automatic control mode signal, determine a preset power parameter based on the feedback parameters.

[0032] Step 204, determine a fuel distribution strategy based on the preset power parameter.

[0033] Step 205, determine the opening degree of the fuel control valve based on the fuel distribution strategy.

[0034] Step 206, determine the target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel control valve.

[0035] It should be noted that in the embodiments of the present invention, the fuel distribution strategy indicates the fuel distribution ratio and the fuel distribution time corresponding to the fuel control valve; the fuel configuration strategy corresponds to restricted protection conditions.

[0036] That is, the manual open-loop control process involved in the embodiments of the present invention includes the following steps: (1) After the unit is connected to the grid, it defaults to the automatic control mode, and the unit performs power closed-loop control according to the set power reference; (2) Adjust the fuel distribution according to the preset partition switching strategy and distribution ratio adjustment algorithm; (3) Obtain the opening degrees of the fuel regulating valves in the three zones after limit protection; (4) It is also possible to adjust the emission effect in the manual open-loop mode or manual closed-loop mode, correct the control strategy in the automatic control mode, and re-enter the automatic control mode to execute according to the new control strategy.

[0037] Step 207: In response to the mode selection signal being the manual open-loop control mode signal, determine at least one fuel increase or decrease step size.

[0038] In the embodiment of the present invention, the fuel increase or decrease step size corresponds to the working zone configuration of the target combustion chamber.

[0039] Step 208: Determine the fuel increase or decrease result based on the fuel increase or decrease step size.

[0040] Step 209: Determine the opening degree of the fuel regulating valve based on the fuel increase or decrease result.

[0041] Step 210: Determine the target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel regulating valve.

[0042] It should be noted that in the embodiment of the present invention, the controllable region for single-step fuel increase or decrease is 3.

[0043] That is to say, the manual open-loop control process involved in the embodiment of the present invention includes the following steps: (1) The test personnel select to enter the manual open-loop control mode after the unit is connected to the grid, and the unit performs fuel open-loop control; (2) Set the fuel increase or decrease step sizes for each zone; (3) Select the fuel increase or decrease mode, which can be to transfer the fuel in one zone to another zone, or to separately control the fuel increase or decrease in the three zones; (4) Obtain the opening degrees of the fuel regulating valves in the three zones after limit protection; (5) After the adjustment is completed, the fuel distribution control strategy in the automatic control mode can be corrected according to the emission effect.

[0044] Step 211: In response to the mode selection signal being the manual closed-loop control mode signal, determine at least one target operating condition point based on the feedback parameters.

[0045] Step 212: Determine the fuel distribution strategy corresponding to the working zone of the target combustion chamber based on the operating condition parameters indicated by the target operating condition point.

[0046] Step 213: Determine the opening degree of the fuel regulating valve corresponding to the working zone of the target combustion chamber based on the fuel distribution strategy.

[0047] Step 214: Determine the target operating condition corresponding to the target combustion chamber based on the opening degree of the fuel regulating valve.

[0048] That is, the manual closed-loop control process involved in the embodiments of the present invention includes the following steps: (1) After grid connection, the tester selects to enter the manual closed-loop control mode, and the unit performs power closed-loop control according to the set power; (2) Control the unit power to the specified working condition, input the target values of the distribution ratios of each zone and the distribution time. After the unit enters the steady state, execute fuel distribution, and the fuel distribution ratios and distribution times of the three zones can be arbitrarily combined; (3) After passing through limit protection, calculate the opening degrees of the fuel regulating valves of the three zones; (4) After the distribution is completed and the unit enters the steady state, adjust the unit to the next working condition point and repeat the distribution ratio adjustment process; (5) After the adjustment is completed, the fuel distribution control strategy in the automatic control mode can be corrected according to the emission effect.

[0049] It should be noted that in various embodiments of the present invention, the automatic control mode shown in steps 203 to 206, the manual open-loop control mode shown in steps 207 to 210, and the manual closed-loop control mode shown in steps 211 to 214 can be executed in any order within one control cycle.

[0050] Step 215, generate a protection strategy corresponding to the target working chamber based on the working state of the target combustion chamber.

[0051] Through the setting of this protection strategy, a correction to the current low-emission control strategy can be formed.

[0052] Optionally, in the embodiments of the present invention, the protection strategy includes at least one of an alarm protection strategy, a flashback protection strategy, and an air-fuel ratio prediction strategy.

[0053] That is, the monitoring and early warning process for the emission adjustment effect includes: 1) Monitor the temperature field distribution at the outlet of the low-pressure turbine, identify the flame tube flameout trend, and execute relevant alarms; 2) Monitor the nozzle wall temperature and perform nozzle flashback protection; 3) Calculate the air-fuel ratios of each zone under different working conditions and predict the stable combustion boundary and emission effect; 4) Correct the distribution strategy in the automatic control mode according to the emission adjustment effect.

[0054] In summary, the method provided by the embodiments of the present invention, when performing emission control adjustment on the gas turbine emission chamber, combines the feedback parameters generated by the current working state of the gas turbine with the current working state of the gas turbine, determines the target working condition of the target combustion chamber, and then controls the target combustion chamber in combination with the target working condition. This process completes the low-emission combustion zone switching and online fuel ratio adjustment without shutting down the machine, improving the adjustment efficiency of the working state of the gas turbine combustion chamber.

[0055] The method provided by the embodiment of the present invention can complete the switching of low-emission combustion zones and the online adjustment of fuel ratio without shutting down the machine. At the same time, it monitors and warns against flameout, flashback, and combustion stability, predicts the emission effect, provides a decision basis for emission adjustment for test commissioning personnel, and improves the test commissioning efficiency of the unit.

[0056] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An emission adjustment control method for a low-emission combustion chamber of a gas turbine, characterized in that: The method is applied in a computer device, and the method comprises: Acquiring a feedback parameter, wherein the feedback parameter is a parameter associated with the target combustion chamber; receiving a mode selection signal, wherein the mode selection signal includes at least one of an automatic control mode signal, a manual open-loop control mode signal, and a manual closed-loop control mode signal; Determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal; The target combustion chamber is controlled based on the target operating condition.

2. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 1, characterized in that: The feedback parameter includes at least one of a given load parameter and a load feedback parameter.

3. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 1, characterized in that: In response to the mode selection signal being an automatic control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal includes: Determining a preset power parameter based on the feedback parameter; Determining a fuel distribution strategy based on the preset power parameter; Determine the fuel control valve opening based on the fuel distribution strategy; A target operating condition corresponding to the target combustion chamber is determined based on the fuel control valve opening.

4. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 3, characterized in that: The number of the fuel regulating valves is 3; The fuel distribution strategy indicates the fuel distribution ratio and fuel distribution time corresponding to the fuel regulating valve; The fuel configuration strategy corresponds to a restricted protection condition.

5. The emission adjustment control method for a low emission combustion chamber of a gas turbine according to claim 1, characterized in that: In response to the mode selection signal being a manual open-loop control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal includes: determining at least one fuel increase / decrease step length, the fuel increase / decrease step length corresponding to the working area configuration of the target combustion chamber; Determining a fuel increase or decrease result based on the fuel increase or decrease step length; Determining the fuel control valve opening based on the fuel increase and decrease result; A target operating condition corresponding to the target combustion chamber is determined based on the fuel control valve opening.

6. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 5, characterized in that: The number of fuel increase and decrease steps is 3.

7. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 1, characterized in that: In response to the mode selection signal being a manual closed-loop control mode signal, determining a target operating condition corresponding to the target combustion chamber based on the feedback parameter and the mode selection signal includes: determining at least one target operating point based on the feedback parameter; Determining a fuel distribution strategy corresponding to a working area of ​​the target combustion chamber based on an operating condition parameter indicated by the target operating condition point; Based on the fuel distribution strategy, determining a fuel control valve opening corresponding to a working area of ​​the target combustion chamber; A target operating condition corresponding to the target combustion chamber is determined based on the fuel control valve opening.

8. The method for controlling the emission adjustment of a low-emission combustion chamber of a gas turbine according to claim 1, characterized in that: The method further comprises: Based on the working state of the target combustion chamber, a protection strategy corresponding to the target working chamber is generated, wherein the protection strategy includes at least one of an alarm protection strategy, a backfire protection strategy, and an air-fuel ratio prediction strategy.

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