Low-NOX combustion method and system of gas turbine

Abstract

The invention discloses a low-NOx combustion method and system for a gas turbine, and relates to the technical field of combustion of gas turbines.The low-NOx combustion method comprises the steps that a combustor is started, fuel and air are conveyed into the combustor, and stable flames are formed; the concentration of combustion products is monitored in real time; and comparing the detected concentration result with the comprehensive parameters, outputting a judgment result, and performing optimization. Aiming at the problems of high pollution, low combustion efficiency and the like of a traditional combustion mode, the invention provides a combustion organization mode for performing exhaust gas recirculation according to different combustion product concentrations, and pollutant emission is reduced. According to the method, a comprehensive parameter N related to the concentration of each combustion product is defined, so that the concentration of various combustion products can be comprehensively considered, and the calculation cost is reduced; a central staged combustor is adopted as a combustion organization mode, and efficient and low-emission combustion is achieved through cooperation of a pre-combustion stage and a main combustion stage.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine combustion, and in particular to a gas turbine low NOx combustion method and system. Background Art

[0002] The current status of China's energy-related nitrogen oxide (NOx) emissions is that nitrogen oxides, as a major atmospheric pollutant, have a profound impact on the ecological environment and human health. As the world's largest energy consumer, China's energy structure and usage patterns directly affect NOx emissions. In recent years, although China's energy consumption structure is undergoing profound changes, the proportion of coal in primary energy consumption has declined year by year, while the proportion of clean energy has continued to rise, but coal is still a major component of China's energy structure, and the nitrogen oxide emissions it produces cannot be ignored. The power industry is the main source of nitrogen oxide emissions. Due to the dominant position of coal in electricity production, the nitrogen oxide emissions generated by coal combustion account for a large proportion. In addition, emissions from industries such as industry and transportation cannot be ignored. With the rapid advancement of industrialization and urbanization, nitrogen oxide emissions are showing an upward trend, causing serious impacts on the atmospheric environment and human health. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the technical problem solved by the present invention is: how to solve the problem of excessive NOx emissions and reduced combustion efficiency of combustion products caused by an imbalance in the fuel-air distribution ratio or unreasonable burner structure design in the existing gas turbine combustion process through optimized burner structure and exhaust gas recirculation treatment.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a low NOx combustion method for a gas turbine, comprising the following steps:

[0006] Start the burner and deliver fuel and air into the combustion chamber to form a stable flame;

[0007] Real-time monitoring of the concentration of combustion products;

[0008] The detected concentration results are compared with the comprehensive parameters, and the judgment results are output for optimization.

[0009] As a preferred embodiment of the low NOx combustion method for a gas turbine according to the present invention, the starting burner and delivering fuel and air into the combustion chamber to form a stable flame include:

[0010] Open the fuel and air supply channels, introduce the fuel and air into the premixing chamber in a preset ratio, and enter the combustion chamber after being fully mixed in the expansion space. The combustible mixture entering the combustion chamber is ignited by the ignition device, and the temperature and pressure parameters in the combustion chamber are monitored in real time. By dynamically adjusting the supply flow of fuel and air, a stable flame is formed.

[0011] As a preferred solution of the gas turbine low NOx combustion method of the present invention, the real-time monitoring of the concentration of combustion products includes:

[0012] The infrared gas sensor of the flue gas analyzer installed on the side wall of the combustion chamber or the exhaust device collects the concentration signals of CH4, O2, CO, CO2, NO, and NO2 gases in the combustion products in real time, and transmits the collected signals to the flue gas analyzer. The flue gas analyzer analyzes the signals and calculates the concentration value of each component. According to the preset concentration judgment standard, it judges whether there is unburned gas in the combustion products or the combustion efficiency is insufficient, and records the judgment results to optimize the combustion process.

[0013] As a preferred solution of the gas turbine low NOx combustion method described in the present invention, the comparison between the detected concentration result and the comprehensive parameters includes:

[0014] The concentrations of the combustion products measured by the flue gas analyzer are n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2). The percentage of each combustion product is defined as follows:

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021] The comprehensive parameter is expressed as:

[0022]

[0023] Where a, b, c, d, e, and f are the concentrations of the combustion products of n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2), respectively. 总 is the sum of the concentrations of all gases.

[0024] As a preferred solution of the gas turbine low NOx combustion method described in the present invention, the output determination result includes:

[0025] Compare the calculated comprehensive parameters with the preset values;

[0026] When the comprehensive parameter is greater than the preset value, the fuel and combustion products are not completely burned, and the combustion products enter the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake channel, and the two are fully mixed before combustion;

[0027] When the comprehensive parameter is less than or equal to the preset value, the fuel and combustion products are completely burned, and the combustion products can be discharged through the infrared opening and closing sensor of the exhaust device.

[0028] Another object of the present invention is to provide a gas turbine low NOx combustion system, which can optimize combustion efficiency and effectively reduce nitrogen oxide emissions by real-time monitoring of combustion product concentration and dynamically adjusting the fuel and air supply ratio, in conjunction with an exhaust gas recirculation device, thereby solving the problems of excessive combustion product emissions and incomplete combustion in the prior art.

[0029] In order to solve the above technical problems, the present invention provides the following technical solutions: A gas turbine low NOx combustion system, comprising: a burner assembly, a sensor measurement and analysis assembly, and a gas pipeline assembly;

[0030] The burner assembly is a combustion device of a gas turbine, including a burner and a combustion chamber;

[0031] One end of the burner is connected to the air inlet passage, and the other end is connected to the combustion chamber and the air outlet passage, so that the combustible mixed gas transported from the air inlet passage is fully burned in the combustion chamber and forms a stable and continuous flame;

[0032] The air intake passage allows air and fuel to be fully and evenly mixed in a larger space to form a combustible mixture before entering the burner for combustion;

[0033] The gas outlet passage is used to discharge the combustion products and unburned gases, and one end is connected to the combustion chamber outlet;

[0034] A gas opening and closing valve is provided on the side wall of the combustion chamber, and is connected to the infrared switch sensor on the side wall of the combustion chamber and the exhaust gas recovery channel, so that the exhaust gas that does not meet the standards enters the combustion chamber through the exhaust gas recovery channel for re-combustion.

[0035] As a preferred solution of a gas turbine low NOx combustion system described in the present invention, wherein: the measurement and analysis component includes an infrared opening and closing sensor of an exhaust device, an infrared gas sensor of a flue gas analyzer, a flue gas analyzer, an infrared switch sensor of a combustion chamber side wall, and a control system;

[0036] The flue gas analyzer infrared gas sensor monitors the concentration of combustion products produced in the combustion chamber, including CO, CO2, NO, NO2, CH4, and O2;

[0037] When the flue gas analyzer detects that the concentration of combustion products is within an abnormal range, it transmits a signal to the control system;

[0038] The control system sends a closing signal to the infrared opening and closing sensor of the exhaust device, and simultaneously sends an opening signal to the infrared switch sensor on the side wall of the combustion chamber;

[0039] The control system receives the concentration signal from the gas sensor and issues control instructions to control the opening and closing of the exhaust gas collection device and the exhaust gas recovery channel, and converts the sensing signal transmitted by the gas sensor into an execution signal;

[0040] When the control system receives an abnormal signal from the gas sensor, it immediately sends a feedback execution signal to recirculate the combustion products or discharge them directly;

[0041] If the combustion products are recirculated, a certain amount of air or fuel is delivered to the intake passage, depending on the concentration of the combustion products, and the abnormal combustion state in the combustion chamber is intervened or controlled by changing the fuel or air flow.

[0042] As a preferred solution of a gas turbine low NOx combustion system described in the present invention, wherein: the gas pipeline assembly includes an air inlet channel, a premixing chamber, an air outlet channel, an exhaust gas collection device, and an exhaust gas recovery channel;

[0043] The inlet channel has a built-in premixing chamber for the fuel and air to be fully mixed in the space, and the other side is connected to the inlet of the combustion chamber, so that the mixed gas enters the combustion chamber for combustion;

[0044] The combustion chamber outlet is connected to the gas outlet channel so that the combustion products enter the exhaust gas collection device at the end;

[0045] The exhaust device is equipped with an infrared opening and closing sensor of the exhaust device and an infrared gas sensor of the flue gas analyzer. The infrared gas sensor of the flue gas analyzer is connected to the flue gas analyzer. When the concentration of the combustion product is in an abnormal state, the flue gas analyzer sends a signal to the control system.

[0046] The infrared opening and closing sensor of the exhaust device controls the opening and closing of the exhaust collection device. When it receives a signal of abnormal combustion product concentration from the control system, the exhaust collection device is closed, allowing the combustion products to enter the combustion chamber through the exhaust gas recovery channel for re-combustion; when it receives a signal of normal combustion product concentration from the control system, the exhaust collection device is opened to discharge combustion products that meet the standards.

[0047] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned gas turbine low NOx combustion method when executing the computer program.

[0048] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a gas turbine low NOx combustion method as described above.

[0049] Beneficial effects of the present invention: In view of the problems of high pollution and low combustion efficiency in traditional combustion methods, the present invention proposes a combustion organization mode for recirculating exhaust gas according to different combustion product concentrations, thereby reducing pollutant emissions. The present invention defines a comprehensive parameter N related to the concentration of each combustion product, which is convenient for comprehensive consideration of multiple combustion product concentrations and reduces calculation costs; a central staged burner is used as a combustion organization mode, and efficient and low-emission combustion is achieved through the coordination of the pre-combustion stage and the main combustion stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0051] Figure 1 An overall flow chart of a gas turbine low NOx combustion method provided for the first embodiment of the present invention.

[0052] Figure 2 A structural diagram of a gas turbine low NOx combustion system provided for a second embodiment of the present invention.

[0053] Figure 3 A central graded swirl structure in a gas turbine low NOx combustion method is provided as a third embodiment of the present invention.

[0054] In the figure: 100, burner assembly; 101, burner; 102, combustion chamber; 103, air outlet channel; 104, air inlet channel; 200, sensor measurement and analysis assembly; 201, exhaust device infrared opening and closing sensor; 202, flue gas analyzer infrared gas sensor; 203, flue gas analyzer; 204, combustion chamber side wall infrared switch sensor; 205, control system; 300, gas pipeline assembly; 301, air inlet channel; 302, premixing chamber; 303, air outlet channel; 304, exhaust gas collecting device; 305, waste gas recovery channel. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0056] Example 1, reference Figure 1 According to one embodiment of the present invention, a low NOx combustion method for a gas turbine is provided, comprising:

[0057] Start the burner and deliver fuel and air into the combustion chamber to form a stable flame;

[0058] Real-time monitoring of the concentration of combustion products;

[0059] The detected concentration results are compared with the comprehensive parameters, and the judgment results are output for optimization.

[0060] The starting burner, delivering fuel and air into the combustion chamber to form a stable flame includes:

[0061] Open the fuel and air supply channels, introduce the fuel and air into the premixing chamber in a preset ratio, and enter the combustion chamber after being fully mixed in the expansion space. The combustible mixture entering the combustion chamber is ignited by the ignition device, and the temperature and pressure parameters in the combustion chamber are monitored in real time. By dynamically adjusting the supply flow of fuel and air, a stable flame is formed.

[0062] The infrared gas sensor of the flue gas analyzer installed on the side wall of the combustion chamber or the exhaust device collects the concentration signals of CH4, O2, CO, CO2, NO, and NO2 gases in the combustion products in real time, and transmits the collected signals to the flue gas analyzer. The flue gas analyzer analyzes the signals and calculates the concentration value of each component. According to the preset concentration judgment standard, it judges whether there is unburned gas in the combustion products or the combustion efficiency is insufficient, and records the judgment results to optimize the combustion process.

[0063] The concentrations of the combustion products measured by the flue gas analyzer are n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2). The percentage of each combustion product is defined as follows:

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070] The comprehensive parameter is expressed as:

[0071]

[0072] Where a, b, c, d, e, and f are the concentrations of the combustion products of n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2), respectively. 总 is the sum of the concentrations of all gases.

[0073] Compare the calculated comprehensive parameters with the preset values;

[0074] When the comprehensive parameter is greater than the preset value, the fuel and combustion products are not completely burned, and the combustion products enter the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake channel, and the two are fully mixed before combustion;

[0075] When the comprehensive parameter is less than or equal to the preset value, the fuel and combustion products are completely burned, and the combustion products can be discharged through the infrared opening and closing sensor of the exhaust device.

[0076] Example 2, reference Figure 2 According to an embodiment of the present invention, a system for a low NOx combustion method for a gas turbine is provided, comprising: a burner assembly 100 , a sensor measurement and analysis assembly 200 , and a gas pipeline assembly 300 .

[0077] The burner assembly 100 is a combustion device of a gas turbine, which includes a burner 101 and a combustion chamber 102. One end of the burner 101 is connected to an air inlet passage 104, and the other end is connected to the combustion chamber 102 and an air outlet passage 103. The main function is to fully burn the combustible mixture delivered by the air inlet passage 104 in the combustion chamber 102 and form a stable and continuous flame. The main function of the air inlet passage 104 is to make the air and fuel fully and evenly mixed in a large space, and then enter the burner for combustion after forming a combustible mixture. The air outlet passage 103 is mainly used to discharge the combustion products and unburned gases, and one end is connected to the combustion chamber outlet. The side wall of the combustion chamber 102 is provided with a gas opening and closing valve, and is connected to the infrared switch sensor on the side wall of the combustion chamber and the exhaust gas recovery channel, so that the exhaust gas that does not meet the standards can enter the combustion chamber through the exhaust gas recovery channel for re-combustion.

[0078] The measurement and analysis component 200 includes an infrared on / off sensor 201 for the exhaust device, an infrared gas sensor 202 for the flue gas analyzer, a flue gas analyzer 203, an infrared switch sensor 204 for the combustion chamber side wall, and a control system 205. The infrared gas sensor 202 for the flue gas analyzer is used to monitor the concentration of combustion products generated in the combustion chamber, including CH4, O2, CO, CO2, NO, NO2, etc. When the flue gas analyzer 203 detects that the concentration in the combustion products is in an abnormal range, it transmits a signal to the control system 205, and the control system 205 sends a closing signal to the infrared on / off sensor 201 for the exhaust device, and simultaneously sends an opening signal to the infrared switch sensor 204 for the combustion chamber side wall. The concentration judgment standard in the combustion products follows the following principles:

[0079] 1. When the CH4 concentration in the combustion products exceeds 100ppm, it indicates that there is unburned CH4 in the combustion products. The combustion products are introduced into the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake passage. The two are mixed fully before combustion.

[0080] 2. When the O2 concentration in the combustion products exceeds 100ppm, it indicates that there is excess unburned O2 in the combustion products. The combustion products are introduced into the combustion chamber through the exhaust gas recovery pipeline, and completely equivalently burned CH4 is introduced into the intake passage. The two are mixed fully before combustion.

[0081] 3. When the concentration of CO and CO2 in the combustion products exceeds 50ppm, it indicates that the fuel and air are not completely burned. The combustion products are introduced into the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake passage. The two are mixed fully before combustion.

[0082] 4. When the concentration of NO and NO2 in the combustion products exceeds 50ppm, it indicates that the fuel and air are not burned equivalently and the combustion is incomplete. The combustion products are introduced into the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake passage. The two are mixed fully before combustion.

[0083] 5. Define a comprehensive parameter N (weighted average) related to the concentration of each combustion product. The concentrations of each combustion product measured by the flue gas analyzer are n(CH4), n(O2), n(CO), n(CO2), n(NO), n(NO2), n 总 is the sum of the concentrations of all gases, and the proportion of each combustion product is defined as follows:

[0084]

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091] 6. When N>5%, it indicates that the fuel and combustion products are not completely burned. The combustion products are introduced into the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake passage. The two are mixed fully before combustion.

[0092] 7. When N is less than 5%, it indicates that the fuel and combustion products are completely burned, and the combustion products can be discharged through the infrared opening and closing sensor of the exhaust device.

[0093] The control system 205 is mainly used to receive the concentration signal of the gas sensor and issue control instructions to control the opening and closing of the exhaust gas collection device 304 and the exhaust gas recovery channel 305. The control system converts the sensing signal transmitted by the gas sensor into an execution signal through a variety of control methods. When the control system 205 receives the abnormal signal of the gas sensor, it immediately sends a feedback execution signal to recirculate the combustion products or directly discharge them. If the combustion products recirculate the exhaust gas, a certain amount of air or fuel is delivered to the intake channel depending on the concentration of the combustion products, and the abnormal combustion state in the combustion chamber is intervened or controlled by changing the fuel or air flow rate.

[0094] The gas pipeline assembly 300 includes an air inlet channel 301, a premixing chamber 302, an air outlet channel 303, an exhaust gas collection device 304, and an exhaust gas recovery channel 305. The air inlet channel 301 has a built-in premixing chamber 302 for the fuel and air to be fully mixed in a larger space, and the other side is connected to the inlet of the combustion chamber so that the mixed gas enters the combustion chamber for combustion. The outlet of the combustion chamber is connected to the air outlet channel 303 so that the combustion products enter the exhaust gas collection device 304 at the end. The exhaust device is equipped with an exhaust device infrared opening and closing sensor 201 and a flue gas analyzer infrared gas sensor 202. The flue gas analyzer infrared gas sensor 202 is connected to the flue gas analyzer. When the concentration of the combustion products is in an abnormal state, the flue gas analyzer sends a signal to the control system. The infrared opening and closing sensor 201 of the exhaust device is mainly responsible for the opening and closing of the scheduling collection device. When it receives a signal of abnormal combustion product concentration from the control system, the exhaust collection device is closed, allowing the combustion products to enter the combustion chamber through the exhaust gas recovery channel for re-combustion; when it receives a signal of normal combustion product concentration from the control system, the exhaust collection device is opened to discharge combustion products that meet the standards.

[0095] It is further explained that:

[0096] The burner structure selects a central graded swirl structure. The central graded combustion chamber is a graded / zoned combustion organization mode, which is usually composed of a central pre-combustion stage and a main combustion stage concentrically surrounding the pre-combustion stage.

[0097] Combustion organization mode: The central staged combustion chamber adopts a staged combustion organization mode, and realizes efficient and low-emission combustion through the cooperation of the pre-combustion stage and the main combustion stage. The pre-combustion stage is mainly responsible for producing the fuel-air mixture quality suitable for ignition and low-power working state, as well as the flow field characteristics that meet the design requirements of ignition, lean-burn stable combustion, and efficient combustion; the main combustion stage works under high-power working state, and realizes low-pollution or high-temperature rise combustion by matching the air / fuel of the pre-combustion stage.

[0098] Technical features: All combustion air enters from the flame tube head, and the amount of cooling air is greatly reduced compared with conventional combustion chambers. The flame tube head is composed of a pre-combustion stage and a main combustion stage, which are nested together in the form of concentric circles, respectively generating two coaxial annular rotating jets. High-capacity heat combustion can be achieved through the matching of flow field and temperature field.

[0099] Combustion performance optimization: The combustion performance of the center staged combustion chamber is affected by many factors, such as the size and shape of the flame tube and the internal structure of the head swirler. By optimizing the design of these key components, such as adjusting the blade angle and rotation direction, better combustion performance can be achieved.

[0100] In summary, the central staged combustion chamber achieves efficient and low-emission combustion through its unique combustion organization mode and technical characteristics, further improving the performance of the combustion chamber.

[0101] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0102] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0103] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0104] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0105] Example 3, reference Figure 3 This is another embodiment of the present invention. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments. This embodiment experiments the existing traditional method and the method of this embodiment respectively.

[0106] The center graded cyclone structure is mainly divided into two structures: the center stage and the main combustion stage. The parameters of the main combustion stage cyclone 4 are: the number of blades is 12, the angle is 35°, the inner diameter of the blade is 18mm, and the outer diameter is 35mm; the parameters of the center stage cyclone 6 are: the number of blades is 12, the angle is 35°, the inner diameter of the blade is 6mm, and the outer diameter is 13mm. The rotation directions of the two-stage cyclones are opposite. The diameter of the center blunt body 2 is 3mm and the length is 12mm. The outer diameter of the outer sleeve 1 is 9.5mm, the inner diameter is 8mm, and the length is 35mm; the outer diameter of the outer disc 5 of the main combustion stage cyclone is 35mm, the inner diameter is 18mm, and the thickness is 3mm. The outer diameter of the air inlet pipe 3 below the center stage is 5mm, the inner diameter is 4mm, and the length is 10mm. The angle of the conical cylinder at the connection between the upper and lower sleeves of the center stage is 45°, and the upper and lower diameters are consistent with the center stage sleeve and the main combustion stage sleeve, respectively.

[0107] When the burner is working, the premixed gas of fuel and air enters from the air inlet pipe 3 below the center stage and forms a radial swirl through the upper center stage swirler 6; another premixed gas enters from the air inlet pipes on both sides of the combustion chamber, and the two premixed gases meet at the upper nozzle, respectively generating two coaxial annular rotating jets to improve combustion efficiency.

[0108] It is further explained that:

[0109] Start the burner 101 according to the preset test conditions, so that the combustion chamber 102 is filled with flames;

[0110] Start the flue gas analyzer infrared gas sensor 202 and the flue gas analyzer 203, monitor and analyze the contents of CH4, O2, CO, CO2, NO, NO2, etc. in the combustion products in real time, and make judgments according to the set concentrations of the combustion products; if the concentration judgment standard principles 1-6 in the combustion products are met, the signal is transmitted to the control system 205, and the control system 205 sends a closing signal to the infrared opening and closing sensor 201 of the exhaust device, and sends an opening signal to the infrared switch sensor 204 on the side wall of the combustion chamber;

[0111] The control system outputs a certain amount of fuel or air to intervene in abnormal combustion conditions according to the concentration of different combustion products and the concentration judgment standard principle in the combustion products;

[0112] If the concentration judgment principle 1, 3, 4, 6 is met, the control system 205 triggers the air flow meter to input a certain amount of air into the intake passage 104 to recirculate the excess unburned products for exhaust gas combustion;

[0113] If the concentration judgment principle 2 is met, the control system 205 triggers the fuel flow meter to input a certain amount of fuel into the intake passage 104 to recirculate the excess unburned products for exhaust gas combustion;

[0114] If the concentration meets the judgment principle 7, the control system 205 sends an opening signal to the infrared opening and closing sensor 201 of the exhaust device to discharge the exhaust gas that meets the standard.

[0115] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas turbine low NOx combustion method, characterized in that: include: Start the burner and deliver fuel and air into the combustion chamber to form a stable flame; Real-time monitoring of the concentration of combustion products; The detected concentration results are compared with the comprehensive parameters, and the judgment results are output for optimization.

2. A gas turbine low NOx combustion method according to claim 1, characterized in that: The starting burner, delivering fuel and air into the combustion chamber, and forming a stable flame comprises: Open the fuel and air supply channels, introduce the fuel and air into the premixing chamber in a preset ratio, and enter the combustion chamber after being fully mixed in the expansion space. The combustible mixture entering the combustion chamber is ignited by the ignition device, and the temperature and pressure parameters in the combustion chamber are monitored in real time. By dynamically adjusting the supply flow of fuel and air, a stable flame is formed.

3. A gas turbine low NOx combustion method according to claim 2, characterized in that: The real-time monitoring of the concentration of combustion products includes: The infrared gas sensor of the flue gas analyzer installed on the side wall of the combustion chamber or the exhaust device collects the concentration signals of CH4, O2, CO, CO2, NO, and NO2 gases in the combustion products in real time, and transmits the collected signals to the flue gas analyzer. The flue gas analyzer analyzes the signals and calculates the concentration value of each component. According to the preset concentration judgment standard, it judges whether there is unburned gas in the combustion products or the combustion efficiency is insufficient, and records the judgment results to optimize the combustion process.

4. A gas turbine low NOx combustion method as claimed in claim 3, characterized in that: The detected concentration results are compared with the comprehensive parameters, including: The concentrations of the combustion products measured by the flue gas analyzer are n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2). The percentage definition expression of each combustion product is: The comprehensive parameter is expressed as: Where a, b, c, d, e, and f are the concentrations of the combustion products of n(CH4), n(O2), n(CO), n(CO2), n(NO), and n(NO2), respectively. 总 is the sum of the concentrations of all gases.

5. A gas turbine low NOx combustion method as claimed in claim 4, characterized in that: The output determination result includes: Compare the calculated comprehensive parameters with the preset values; When the comprehensive parameter is greater than the preset value, the fuel and combustion products are not completely burned, and the combustion products enter the combustion chamber through the exhaust gas recovery pipeline, and the air of complete equivalent combustion is introduced into the intake channel, and the two are fully mixed before combustion; When the comprehensive parameter is less than or equal to the preset value, the fuel and combustion products are completely burned, and the combustion products can be discharged through the infrared opening and closing sensor of the exhaust device.

6. A system using a gas turbine low NOx combustion method as claimed in any one of claims 1 to 5, characterized in that: A burner assembly (100), a sensor measurement and analysis assembly (200), and a gas pipeline assembly (300); The burner assembly (100) is a combustion device of a gas turbine, comprising a burner (101) and a combustion chamber (102); One end of the burner (101) is connected to the air inlet passage (104), and the other end is connected to the combustion chamber 102) and the air outlet passage (103), so that the combustible mixed gas delivered by the air inlet passage 104 is fully burned in the combustion chamber 102) to form a stable and continuous flame; The air intake passage (104) allows air and fuel to be fully and evenly mixed in a relatively large space to form a combustible mixed gas which then enters the burner for combustion; The gas outlet passage (103) is used to discharge the combustion products and unburned gas, and one end of the gas outlet passage is connected to the combustion chamber outlet; A gas opening and closing valve is provided on the side wall of the combustion chamber (102), and is connected to an infrared switch sensor on the side wall of the combustion chamber and an exhaust gas recovery channel, so that exhaust gas that does not meet the standards enters the combustion chamber through the exhaust gas recovery channel for re-combustion.

7. A gas turbine low NOx combustion system according to claim 6, characterized in that: The measurement and analysis component (200) comprises an infrared opening and closing sensor of an exhaust device (201), an infrared gas sensor of a flue gas analyzer (202), a flue gas analyzer (203), an infrared switch sensor of a combustion chamber side wall 204), and a control system (205); The flue gas analyzer infrared gas sensor (202) monitors the concentration of combustion products produced in the combustion chamber, including CO, CO2, NO, NO2, CH4, and O2; When the flue gas analyzer 203 detects that the concentration of the combustion products is in an abnormal range, a signal is transmitted to the control system (205); The control system (205) sends a closing signal to the infrared opening and closing sensor 201 of the exhaust device, and simultaneously sends an opening signal to the infrared switch sensor (204) on the side wall of the combustion chamber; The control system (205) receives the concentration signal of the gas sensor and issues a control instruction to control the opening and closing of the exhaust gas collection device (304) and the exhaust gas recovery channel (305), and converts the sensing signal transmitted by the gas sensor into an execution signal; When the control system (205) receives an abnormal signal from the gas sensor, it immediately sends a feedback execution signal to recirculate the combustion products or discharge them directly; If the combustion products are recirculated, a certain amount of air or fuel is delivered to the intake passage, depending on the concentration of the combustion products, and the abnormal combustion state in the combustion chamber is intervened or controlled by changing the fuel or air flow.

8. A gas turbine low NOx combustion system according to claim 7, characterized in that: The gas pipeline assembly (300) comprises an air inlet channel (301), a premixing chamber (302), an air outlet channel (303), an exhaust gas collecting device (304), and an exhaust gas recovery channel (305); The air inlet passage (301) has a built-in premixing chamber (302) for fully mixing the fuel and air in the space, and the other side is connected to the inlet of the combustion chamber so that the mixed gas enters the combustion chamber for combustion; The combustion chamber outlet is connected to the gas outlet channel (303), so that the combustion products enter the exhaust gas collection device (304) at the end; An exhaust device infrared opening and closing sensor (201) and a flue gas analyzer infrared gas sensor (202) are installed on the exhaust device. The flue gas analyzer infrared gas sensor (202) is connected to the flue gas analyzer. When the concentration of the combustion product is in an abnormal state, the flue gas analyzer sends a signal to the control system. The infrared opening and closing sensor (201) of the exhaust device controls the opening and closing of the exhaust collection device. When receiving a signal of abnormal combustion product concentration from the control system, the exhaust collection device is closed, allowing the combustion products to enter the combustion chamber through the exhaust gas recovery channel for re-combustion; when receiving a signal of normal combustion product concentration from the control system, the exhaust collection device is opened to discharge combustion products that meet the standards.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a gas turbine low NOx combustion method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the gas turbine low NOx combustion method according to any one of claims 1 to 7 are implemented.

Images