Combustion chamber equivalence ratio adjustment method and combustion chamber applied to gas turbine

Abstract

The embodiment of the present disclosure discloses a combustion chamber equivalence ratio adjustment method and a combustion chamber applied to a gas turbine. A specific implementation of the method includes: generating an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to a primary fuel mass flow rate, a secondary fuel mass flow rate and a tertiary fuel mass flow rate; generating standard nitrogen oxide emission equivalence ratio range information according to target main combustion zone temperature range information; obtaining primary main nozzle wall temperature information, secondary main nozzle wall temperature information and tertiary main nozzle wall temperature information; adjusting the initial primary equivalence ratio, the initial secondary equivalence ratio and the initial tertiary equivalence ratio respectively to obtain a target primary equivalence ratio, a target secondary equivalence ratio and a target tertiary equivalence ratio. According to the target primary equivalence ratio, the target secondary equivalence ratio and the target tertiary equivalence ratio, the gas turbine is controlled to perform a combustion chamber equivalence ratio adjustment operation. This implementation can reduce nitrogen oxide emissions as much as possible, thereby reducing environmental pollution.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of gas turbines, and in particular to a combustion chamber equivalence ratio adjustment method and a combustion chamber applied to a gas turbine. Background Art

[0002] A gas turbine is a thermal engine that uses a continuously flowing gas as a working fluid to drive the impeller to rotate at high speed, converting the thermal energy of the fuel into mechanical work. With the gradual improvement of environmental protection standards, restrictions on pollutant emissions from gas turbines are becoming increasingly stringent. At present, most of the pollutant emissions from gas turbines are reduced by modifying the structure of the nozzle in the gas turbine.

[0003] However, when the above methods are used to reduce pollutant emissions from gas turbines, the following technical problems often occur:

[0004] The combustion chamber equivalence ratio has a certain impact on the nitrogen oxides produced after combustion. If only the structure of the nozzle is modified without considering the size of the combustion chamber equivalence ratio, when the combustion chamber equivalence is relatively large, it will still cause pollutant emissions from the gas turbine and cause environmental pollution.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0006] The content of this disclosure is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] Some embodiments of the present disclosure propose a combustion chamber equivalence ratio adjustment method and a combustion chamber applied to a gas turbine to solve one or more of the technical problems mentioned in the above background technology section.

[0008] In a first aspect, some embodiments of the present disclosure provide a method for adjusting a combustion chamber equivalence ratio, the method comprising: obtaining a primary fuel mass flow, a secondary fuel mass flow and a tertiary fuel mass flow respectively collected by associated primary flow meters, secondary flow meters and tertiary flow meters; generating an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to the primary fuel mass flow, the secondary fuel mass flow and the tertiary fuel mass flow; generating standard nitrogen oxide emission equivalence ratio range information according to the target main combustion zone temperature range information; obtaining an associated primary temperature detection device, The secondary temperature detection device and the tertiary temperature detection device respectively collect the primary main nozzle wall temperature information, the secondary main nozzle wall temperature information and the tertiary main nozzle wall temperature information; according to the primary main nozzle wall temperature information, the secondary main nozzle wall temperature information, the tertiary main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the initial primary equivalence ratio, the initial secondary equivalence ratio and the initial tertiary equivalence ratio are respectively adjusted to obtain the target primary equivalence ratio, the target secondary equivalence ratio and the target tertiary equivalence ratio. According to the target primary equivalence ratio, the target secondary equivalence ratio and the target tertiary equivalence ratio, the gas turbine is controlled to perform the combustion chamber equivalence ratio adjustment operation.

[0009] Optionally, the above-mentioned generating an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to the above-mentioned primary fuel mass flow rate, the above-mentioned secondary fuel mass flow rate and the above-mentioned tertiary fuel mass flow rate includes: determining the primary air distribution ratio coefficient, the secondary air distribution ratio coefficient and the tertiary air distribution ratio coefficient corresponding to the primary main nozzle, the secondary main nozzle and the tertiary main nozzle respectively; generating an initial primary equivalence ratio according to the above-mentioned primary air distribution ratio coefficient, the above-mentioned primary fuel mass flow rate, the air mass flow rate, the air density and the fuel density; generating an initial secondary equivalence ratio according to the above-mentioned secondary air distribution ratio coefficient, the above-mentioned secondary fuel mass flow rate, the air mass flow rate, the air density and the fuel density; generating an initial tertiary equivalence ratio according to the above-mentioned tertiary air distribution ratio coefficient, the above-mentioned tertiary fuel mass flow rate, the air mass flow rate, the air density and the fuel density.

[0010] Optionally, the target main combustion zone temperature range information is generated by the following steps: obtaining the main combustion zone temperature sequence, nitrogen oxide emission sequence and main combustion zone equivalent ratio sequence within a preset time period; performing curve fitting processing on the main combustion zone temperature sequence and the nitrogen oxide emission sequence to obtain temperature nitrogen oxide characteristic curve information; performing curve fitting processing on the main combustion zone temperature sequence and the main combustion zone equivalent ratio sequence to obtain temperature equivalent ratio characteristic curve information; generating a main combustion zone temperature upper limit value based on the standard nitrogen oxide emission and the temperature nitrogen oxide characteristic curve information; generating a main combustion zone temperature lower limit value based on the standard equivalent ratio threshold and the temperature equivalent ratio characteristic curve information; determining the target main combustion zone temperature range information based on the main combustion zone temperature upper limit value and the main combustion zone temperature lower limit value.

[0011] Optionally, the first-level main nozzle wall temperature information includes the wall temperatures of each first-level main nozzle, the second-level main nozzle wall temperature information includes the wall temperatures of each second-level main nozzle, and the third-level main nozzle wall temperature information includes the wall temperatures of each third-level main nozzle; and according to the first-level main nozzle wall temperature information, the second-level main nozzle wall temperature information, the third-level main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the initial first-level equivalence ratio, the initial second-level equivalence ratio and the initial third-level equivalence ratio are adjusted and processed respectively to obtain a target first-level equivalence ratio, a target second-level equivalence ratio and a target third-level equivalence ratio, including: determining the first standard main nozzle wall temperature interval information and the second standard main nozzle wall temperature interval information according to the standard nitrogen oxide emission equivalence ratio range information; determining the average value of the above-mentioned first-level main nozzle wall temperatures The average wall temperature of the first-level main nozzle is determined as the average wall temperature of the second-level main nozzle; the average value of the wall temperatures of the above-mentioned three-level main nozzles is determined as the average wall temperature of the three-level main nozzle; according to the first standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the first-level main nozzle wall temperature, the initial first-level equivalence ratio is adjusted to obtain the target first-level equivalence ratio; according to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the second-level main nozzle wall temperature, the initial second-level equivalence ratio is adjusted to obtain the target second-level equivalence ratio; according to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the three-level main nozzle wall temperature, the initial three-level equivalence ratio is adjusted to obtain the target three-level equivalence ratio.

[0012] Optionally, the first standard main nozzle wall temperature interval information includes a first main nozzle wall temperature lower limit value and a first main nozzle wall temperature upper limit value, and the second standard main nozzle wall temperature interval information includes a second main nozzle wall temperature lower limit value and a second main nozzle wall temperature upper limit value; and the initial first-stage equivalence ratio is adjusted based on the first standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the first-stage main nozzle wall temperature average wall temperature to obtain a target first-stage equivalence ratio, including: determining whether the first-stage main nozzle wall temperature average wall temperature is greater than or equal to the first main nozzle wall temperature lower limit value and less than or equal to the first main nozzle wall temperature upper limit value; in response to determining the first-stage main nozzle wall temperature average wall temperature, the first-stage main nozzle wall temperature average wall temperature is adjusted based on the first standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the first-stage main nozzle wall temperature average wall temperature to obtain a target first-stage equivalence ratio. In response to determining that the average wall temperature of the first-stage main nozzle is greater than the upper limit value of the wall temperature of the first main nozzle, the initial first-stage equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain the target first-stage equivalence ratio; in response to determining that the average wall temperature of the first-stage main nozzle is greater than the upper limit value of the wall temperature of the first main nozzle and less than or equal to the upper limit value of the wall temperature of the first main nozzle, the target first-stage equivalence ratio is generated according to the initial first-stage equivalence ratio.

[0013] Optionally, the initial secondary equivalence ratio is adjusted according to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the secondary main nozzle wall temperature to obtain a target secondary equivalence ratio, including: determining whether the average wall temperature of the secondary main nozzle wall temperature is greater than or equal to the lower limit value of the second main nozzle wall temperature and less than or equal to the upper limit value of the second main nozzle wall temperature; in response to determining that the average wall temperature of the secondary main nozzle wall temperature is less than the lower limit value of the second main nozzle wall temperature, according to the standard nitrogen oxide emission equivalence ratio range information, the initial secondary equivalence ratio is increased to obtain a target secondary equivalence ratio; in response to determining that the average wall temperature of the secondary main nozzle wall temperature is greater than the upper limit value of the second main nozzle wall temperature, according to the standard nitrogen oxide emission equivalence ratio range information, the initial secondary equivalence ratio is reduced to obtain a target secondary equivalence ratio; in response to determining that the average wall temperature of the secondary main nozzle wall temperature is greater than the lower limit value of the second main nozzle wall temperature and less than or equal to the upper limit value of the second main nozzle wall temperature, a target secondary equivalence ratio is generated according to the initial secondary equivalence ratio.

[0014] Optionally, the initial three-stage equivalence ratio is adjusted based on the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalent ratio range information and the three-stage main nozzle wall temperature average wall temperature to obtain a target three-stage equivalence ratio, including: determining whether the three-stage main nozzle wall temperature average wall temperature is greater than or equal to the second main nozzle wall temperature lower limit value and less than or equal to the second main nozzle wall temperature upper limit value; in response to determining that the three-stage main nozzle wall temperature average wall temperature is less than the second main nozzle wall temperature lower limit value, according to the standard nitrogen oxide emission equivalent ratio In response to determining that the average wall temperature of the third-stage main nozzle is greater than the upper limit value of the second main nozzle wall temperature, according to the standard nitrogen oxide emission equivalence ratio range information, the initial third-stage equivalence ratio is reduced to obtain the target third-stage equivalence ratio; in response to determining that the average wall temperature of the third-stage main nozzle is greater than or equal to the lower limit value of the second main nozzle wall temperature and less than or equal to the upper limit value of the second main nozzle wall temperature, according to the initial third-stage equivalence ratio, the target third-stage equivalence ratio is generated.

[0015] Optionally, the above-mentioned initial secondary equivalence ratio is adjusted according to the second standard main nozzle wall temperature interval information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned secondary main nozzle wall temperature average wall temperature to obtain a target secondary equivalence ratio, including: determining the average value of the above-mentioned secondary main nozzle wall temperature average wall temperature and the above-mentioned tertiary main nozzle wall temperature average wall temperature as the average main nozzle wall temperature; determining the absolute value of the difference between the above-mentioned secondary main nozzle wall temperature average wall temperature and the above-mentioned average main nozzle wall temperature as the secondary main nozzle wall temperature information difference; determining whether the above-mentioned secondary main nozzle wall temperature information difference is greater than the preset main nozzle wall temperature difference; in response to determining that the above-mentioned secondary main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference, according to the second standard main nozzle wall temperature interval information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned secondary main nozzle wall temperature average wall temperature, the above-mentioned initial secondary equivalence ratio is reduced to obtain the target secondary equivalence ratio.

[0016] Optionally, the above-mentioned initial three-level equivalence ratio is adjusted according to the second standard main nozzle wall temperature interval information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned three-level main nozzle wall temperature average wall temperature to obtain a target three-level equivalence ratio, including: determining the absolute value of the difference between the above-mentioned three-level main nozzle wall temperature average wall temperature and the above-mentioned average main nozzle wall temperature as the three-level main nozzle wall temperature information difference; determining whether the above-mentioned three-level main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference; in response to determining that the above-mentioned three-level main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference, according to the second standard main nozzle wall temperature interval information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned three-level main nozzle wall temperature average wall temperature, the initial three-level equivalence ratio is reduced to obtain the target three-level equivalence ratio.

[0017] Optionally, the initial first-level equivalence ratio, the initial second-level equivalence ratio and the initial third-level equivalence ratio are adjusted and processed respectively according to the first-level main nozzle wall temperature information, the second-level main nozzle wall temperature information, the third-level main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information to obtain a target first-level equivalence ratio, a target second-level equivalence ratio and a target third-level equivalence ratio, including: obtaining the combustion pressure pulsation amplitude through an associated dynamic pressure sensor; obtaining the main nozzle intake temperature collected by an associated intake thermocouple; obtaining a combustion chamber outlet temperature set collected by an associated outlet temperature measuring rake; determining the average value of each combustion chamber outlet temperature in the above combustion chamber outlet temperature set as the combustion chamber outlet average temperature; and obtaining the combustion chamber outlet average temperature from the above The combustion chamber outlet temperatures are centrally screened out to find the combustion chamber outlet temperatures that meet the preset combustion chamber outlet temperature conditions, and the target combustion chamber outlet temperature is obtained; the absolute value of the difference between the above-mentioned combustion chamber outlet average temperature and the above-mentioned target combustion chamber outlet temperature is determined as the combustion chamber outlet temperature difference; the difference between the above-mentioned combustion chamber outlet average temperature and the above-mentioned main nozzle intake temperature is determined as the inlet and outlet temperature difference; according to the above-mentioned combustion chamber outlet temperature difference and the above-mentioned inlet and outlet temperature difference, a combustion chamber outlet circumferential temperature distribution coefficient is generated; according to the above-mentioned combustion chamber outlet circumferential temperature distribution coefficient, the above-mentioned combustion pressure pulsation amplitude, the above-mentioned second standard main nozzle wall temperature range information and the above-mentioned standard nitrogen oxide emission equivalence ratio range information, the above-mentioned initial secondary equivalence ratio and the above-mentioned initial tertiary equivalence ratio are adjusted to obtain the target secondary equivalence ratio and the target tertiary equivalence ratio.

[0018] In a second aspect, some embodiments of the present disclosure provide a combustion chamber applied to a gas turbine, for implementing the method described in any implementation of the first aspect, wherein the combustion chamber comprises a flame tube and a main nozzle; the flame tube is connected to one side of the main nozzle, and the main nozzle comprises a primary main nozzle, a secondary main nozzle and a tertiary main nozzle. A primary temperature detection device is provided on the primary main nozzle, a secondary temperature detection device is provided on the secondary main nozzle, and a tertiary temperature detection device is provided on the tertiary main nozzle.

[0019] The above-mentioned embodiments of the present disclosure have the following beneficial effects: through the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure, the combustion chamber equivalence ratio of the gas turbine can be adjusted within an appropriate range, the primary, secondary and tertiary partition fuel amounts of the main nozzles in each working condition can be reasonably allocated, and the primary, secondary and tertiary partition equivalence ratios of the main nozzles can be controlled to reduce nitrogen oxide emissions as much as possible, thereby reducing environmental pollution. Specifically, the cause of environmental pollution is that the combustion chamber equivalence ratio has a certain influence on the nitrogen oxides produced after combustion. Only the structural modification of the nozzle is performed without considering the size of the combustion chamber equivalence ratio. When the combustion chamber equivalence ratio is relatively large, it will still cause pollutant emissions from the gas turbine. Based on this, the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure, first, obtain the primary fuel mass flow, the secondary fuel mass flow and the tertiary fuel mass flow collected by the associated primary flow meter, the secondary flow meter and the tertiary flow meter respectively. Secondly, according to the above-mentioned primary fuel mass flow, the above-mentioned secondary fuel mass flow and the above-mentioned tertiary fuel mass flow, generate the initial primary equivalence ratio, the initial secondary equivalence ratio and the initial tertiary equivalence ratio. Then, based on the target main combustion zone temperature range information, the standard nitrogen oxide emission equivalence ratio range information is generated. After that, the first-level main nozzle wall temperature information, the second-level main nozzle wall temperature information and the third-level main nozzle wall temperature information respectively collected by the associated first-level temperature detection device, the second-level temperature detection device and the third-level temperature detection device are obtained. Then, based on the above-mentioned first-level main nozzle wall temperature information, the above-mentioned second-level main nozzle wall temperature information, the above-mentioned third-level main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the above-mentioned initial first-level equivalence ratio, the above-mentioned initial second-level equivalence ratio and the above-mentioned initial third-level equivalence ratio are adjusted and processed respectively to obtain the target first-level equivalence ratio, the target second-level equivalence ratio and the target third-level equivalence ratio. Finally, based on the above-mentioned target first-level equivalence ratio, the above-mentioned target second-level equivalence ratio and the above-mentioned target third-level equivalence ratio, the gas turbine is controlled to perform the combustion chamber equivalence ratio adjustment operation. Because the emission of nitrogen oxides is closely related to the temperature of the main combustion zone, the equivalence ratio range for low nitrogen oxide emissions can be determined through the relationship between the main combustion zone temperature, nitrogen oxide emissions and equivalence ratio. Also, based on the standard main nozzle wall temperature range information, the wall temperature of each main nozzle is controlled by adjusting the equivalence ratio, thereby ensuring that the main nozzle wall temperature does not exceed the temperature, that is, the outlet temperature of each main nozzle does not exceed the temperature, further achieving the purpose of reducing nitrogen oxide emissions. Therefore, the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure can adjust the equivalence ratio of the gas turbine combustion chamber within an appropriate range, reasonably allocate the fuel amount of the primary, secondary and tertiary partitions of the main nozzles in each working condition, control the equivalence ratio of the primary, secondary and tertiary partitions of the main nozzles, and reduce nitrogen oxide emissions as much as possible, thereby reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0021] Figure 1 is a schematic diagram of an application scenario of a combustion chamber equivalence ratio adjustment method in some embodiments of the present disclosure;

[0022] Figure 2 It is a schematic structural diagram of some embodiments of a main nozzle included in a combustion chamber applied to a gas turbine of the present disclosure;

[0023] Figure 3 It is a schematic structural diagram of some embodiments of a temperature detection device provided in a main nozzle included in a combustion chamber of a gas turbine according to the present disclosure;

[0024] Figure 4 is a schematic structural diagram of some embodiments of a combustion chamber applied to a gas turbine according to the present disclosure;

[0025] Figure 5 It is a schematic diagram of the structure of some embodiments of the dynamic pressure sensor included in the combustion chamber of the gas turbine according to the present disclosure. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0027] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0028] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0030] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0031] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] refer to Figure 1 , shows a process 100 of some embodiments of the combustion chamber equivalence ratio adjustment method according to the present disclosure. The combustion chamber equivalence ratio adjustment method comprises the following steps:

[0033] Step 101, obtaining the primary fuel mass flow, the secondary fuel mass flow and the tertiary fuel mass flow respectively collected by the associated primary flow meter, the secondary flow meter and the tertiary flow meter.

[0034] In some embodiments, the executor of the combustion chamber equivalence ratio adjustment method (e.g., a pure hydrogen gas turbine) can obtain the primary fuel mass flow, secondary fuel mass flow, and tertiary fuel mass flow collected by the associated primary flow meter, secondary flow meter, and tertiary flow meter, respectively.

[0035] Step 102, generating an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to the primary fuel mass flow rate, the secondary fuel mass flow rate and the tertiary fuel mass flow rate.

[0036] In some embodiments, the execution entity may generate an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to the primary fuel mass flow rate, the secondary fuel mass flow rate and the tertiary fuel mass flow rate.

[0037] In some optional implementations of some embodiments, according to the primary fuel mass flow rate, the secondary fuel mass flow rate, and the tertiary fuel mass flow rate, the execution entity may generate an initial primary equivalence ratio, an initial secondary equivalence ratio, and an initial tertiary equivalence ratio by executing the following steps:

[0038] The first step is to determine the primary air ratio coefficient, the secondary air distribution ratio coefficient and the tertiary air distribution ratio coefficient corresponding to the primary main nozzle, the secondary main nozzle and the tertiary main nozzle respectively.

[0039] The second step is to generate an initial primary equivalence ratio according to the primary air distribution ratio coefficient, the primary fuel mass flow rate, the air mass flow rate, the air density and the fuel density. In practice, the execution entity can generate the initial primary equivalence ratio by the following formula:

[0040]

[0041] Among them, W f1is the primary fuel mass flow rate. f is the fuel density. a is the air mass flow rate. For example, the air mass flow rate can be a fixed value of 12.7 kg / s, ρ a is the air density. The value 2.38 is the conversion coefficient of oxygen required for complete combustion of hydrogen per unit volume. The value 0.7 is the loss coefficient constant of air entering the combustion chamber. The value 0.25 is the air distribution ratio coefficient of the primary zone of the main nozzle.

[0042] The third step is to generate an initial secondary equivalence ratio according to the secondary air distribution ratio coefficient, the secondary fuel mass flow rate, the air mass flow rate, the air density and the fuel density. In practice, the execution entity can generate the initial secondary equivalence ratio by the following formula:

[0043]

[0044] Among them, W f2 is the primary fuel mass flow rate. The value 0.3 is the air distribution ratio coefficient of the secondary area of ​​the main nozzle.

[0045] The fourth step is to generate an initial three-stage equivalence ratio according to the three-stage air distribution ratio coefficient, the three-stage fuel mass flow rate, the air mass flow rate, the air density and the fuel density. In practice, the above-mentioned execution entity can generate the initial three-stage equivalence ratio through the following formula:

[0046]

[0047] Among them, W f3 is the primary fuel mass flow rate. The value 0.45 is the air distribution ratio coefficient of the primary nozzle's third-stage area.

[0048] Step 103, generating standard nitrogen oxide emission equivalent ratio range information according to the target main combustion zone temperature range information.

[0049] In some embodiments, the above-mentioned execution entity can generate standard nitrogen oxide emission equivalent ratio range information based on the target main combustion zone temperature range information.

[0050] Optionally, the target main combustion zone temperature range information is generated by the following steps:

[0051] The first step is to obtain the main combustion zone temperature sequence, nitrogen oxide emission sequence and main combustion zone equivalence ratio sequence within a preset time period. The preset time period can be a pre-set period of time. In practice, the execution subject can obtain the main combustion zone temperature sequence, nitrogen oxide emission sequence and main combustion zone equivalence ratio sequence within the preset time period of the test phase.

[0052] The second step is to perform curve fitting processing on the main combustion zone temperature sequence and the nitrogen oxide emission sequence to obtain temperature nitrogen oxide characteristic curve information.

[0053] The third step is to perform curve fitting processing on the main combustion zone temperature sequence and the main combustion zone equivalence ratio sequence to obtain temperature equivalence ratio characteristic curve information.

[0054] The fourth step is to generate the upper limit of the main combustion zone temperature according to the standard nitrogen oxide emission and the temperature nitrogen oxide characteristic curve information. In practice, the execution entity may input the standard nitrogen oxide emission into the temperature nitrogen oxide characteristic curve information to obtain the upper limit of the main combustion zone temperature.

[0055] The fifth step is to generate the lower limit value of the main combustion zone temperature according to the standard equivalence ratio threshold and the temperature equivalence ratio characteristic curve information. In practice, the execution entity may input the standard nitrogen oxide emission into the temperature equivalence ratio characteristic curve information to obtain the lower limit value of the main combustion zone temperature.

[0056] The sixth step is to determine the target main combustion zone temperature range information according to the above main combustion zone temperature upper limit value and the above main combustion zone temperature lower limit value.

[0057] Step 104 , obtaining the primary main nozzle wall temperature information, the secondary main nozzle wall temperature information and the tertiary main nozzle wall temperature information collected by the associated primary temperature detection device, the secondary temperature detection device and the tertiary temperature detection device respectively.

[0058] In some embodiments, the above-mentioned execution entity can obtain the first-level main nozzle wall temperature information, the second-level main nozzle wall temperature information and the third-level main nozzle wall temperature information collected by the associated first-level temperature detection device, the second-level temperature detection device and the third-level temperature detection device respectively.

[0059] Step 105, based on the first-stage main nozzle wall temperature information, the second-stage main nozzle wall temperature information, the third-stage main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the initial first-stage equivalence ratio, the initial second-stage equivalence ratio and the initial third-stage equivalence ratio are adjusted respectively to obtain the target first-stage equivalence ratio, the target second-stage equivalence ratio and the target third-stage equivalence ratio.

[0060] In some embodiments, the above-mentioned execution entity can adjust the above-mentioned initial first-level equivalence ratio, the above-mentioned initial second-level equivalence ratio and the above-mentioned initial third-level equivalence ratio respectively according to the above-mentioned first-level main nozzle wall temperature information, the above-mentioned second-level main nozzle wall temperature information, the above-mentioned third-level main nozzle wall temperature information, the first standard main nozzle wall temperature range information, the second standard main nozzle wall temperature range information and the standard nitrogen oxide emission equivalence ratio range information to obtain the target first-level equivalence ratio, the target second-level equivalence ratio and the target third-level equivalence ratio.

[0061] Optionally, the first-level main nozzle wall temperature information may include the wall temperatures of each first-level main nozzle. The second-level main nozzle wall temperature information may include the wall temperatures of each second-level main nozzle. The third-level main nozzle wall temperature information may include the wall temperatures of each third-level main nozzle. It can be understood that a plurality of thermocouple reserved holes are provided on the first-level main nozzle, the second-level main nozzle and the third-level main nozzle, and a thermocouple is provided in each thermocouple reserved hole, and the thermocouple is used to detect the wall temperature of the main nozzle.

[0062] In some optional implementations of some embodiments, based on the first-stage main nozzle wall temperature information, the second-stage main nozzle wall temperature information, the third-stage main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the execution subject may adjust the initial first-stage equivalence ratio, the initial second-stage equivalence ratio and the initial third-stage equivalence ratio respectively through the following steps to obtain a target first-stage equivalence ratio, a target second-stage equivalence ratio and a target third-stage equivalence ratio:

[0063] The first step is to determine the first standard main nozzle wall temperature interval information and the second standard main nozzle wall temperature interval information according to the above-mentioned standard nitrogen oxide emission equivalence ratio range information. In practice, the above-mentioned execution entity can determine the first standard main nozzle wall temperature interval information and the second standard main nozzle wall temperature interval information according to the above-mentioned standard nitrogen oxide emission equivalence ratio range information by presetting the first standard main nozzle wall temperature interval matching information table and the preset second standard main nozzle wall temperature interval matching information table. The preset first standard main nozzle wall temperature interval matching information table and the preset second standard main nozzle wall temperature interval matching information table can be obtained by dynamically adjusting the fuel flow of each partition through PID (Process Identifier) ​​to control the equivalence ratio of each partition main nozzle within the above-mentioned standard nitrogen oxide emission equivalence ratio range information through experiments.

[0064] In the second step, the average value of the wall temperatures of the above-mentioned first-stage main nozzles is determined as the average wall temperature of the first-stage main nozzle.

[0065] In the third step, the average value of the wall temperatures of the above-mentioned secondary main nozzles is determined as the average wall temperature of the secondary main nozzle.

[0066] In the fourth step, the average value of the wall temperatures of the above-mentioned three-stage main nozzles is determined as the average wall temperature of the three-stage main nozzles.

[0067] The fifth step is to adjust the initial first-stage equivalence ratio according to the first standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the first-stage main nozzle wall temperature to obtain the target first-stage equivalence ratio.

[0068] The sixth step is to adjust the initial secondary equivalence ratio according to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the secondary main nozzle wall temperature to obtain the target secondary equivalence ratio.

[0069] The seventh step is to adjust the initial three-stage equivalence ratio according to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the average wall temperature of the three-stage main nozzle wall temperature to obtain the target three-stage equivalence ratio.

[0070] Optionally, the first standard main nozzle wall temperature range information includes a first main nozzle wall temperature lower limit value and a first main nozzle wall temperature upper limit value, and the second standard main nozzle wall temperature range information includes a second main nozzle wall temperature lower limit value and a second main nozzle wall temperature upper limit value.

[0071] In some optional implementations of some embodiments, according to the first standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the first-stage main nozzle wall temperature information, the execution entity may adjust the initial first-stage equivalence ratio through the following steps to obtain a target first-stage equivalence ratio:

[0072] The first step is to determine whether the average wall temperature of the first-stage main nozzle is greater than or equal to the lower limit of the first main nozzle wall temperature and less than or equal to the upper limit of the first main nozzle wall temperature.

[0073] In the second step, in response to determining that the average wall temperature of the first-stage main nozzle is less than the lower limit of the first main nozzle wall temperature, the initial first-stage equivalence ratio is increased according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target first-stage equivalence ratio.

[0074] In the third step, in response to determining that the average wall temperature of the first-stage main nozzle is greater than the upper limit value of the first main nozzle wall temperature, the initial first-stage equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target first-stage equivalence ratio.

[0075] In step 4, in response to determining that the average wall temperature of the first-stage main nozzle wall temperature is greater than or equal to the first main nozzle wall temperature lower limit value and less than or equal to the first main nozzle wall temperature upper limit value, a target first-stage equivalence ratio is generated according to the initial first-stage equivalence ratio. In practice, the execution entity may determine the initial first-stage equivalence ratio as the target first-stage equivalence ratio.

[0076] In some optional implementations of some embodiments, according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the secondary main nozzle wall temperature information, the execution entity may adjust the initial secondary equivalence ratio through the following steps to obtain a target secondary equivalence ratio:

[0077] The first step is to determine whether the average wall temperature of the secondary main nozzle is greater than or equal to the lower limit of the second main nozzle wall temperature and less than or equal to the upper limit of the second main nozzle wall temperature.

[0078] In the second step, in response to determining that the average wall temperature of the above-mentioned secondary main nozzle is less than the lower limit value of the above-mentioned second main nozzle wall temperature, the above-mentioned initial secondary equivalence ratio is increased according to the above-mentioned standard nitrogen oxide emission equivalence ratio range information to obtain the target secondary equivalence ratio.

[0079] The third step, in response to determining that the average wall temperature of the above-mentioned secondary main nozzle wall temperature is greater than the above-mentioned second main nozzle wall temperature upper limit value, the above-mentioned initial secondary equivalence ratio is reduced according to the above-mentioned standard nitrogen oxide emission equivalence ratio range information to obtain the target secondary equivalence ratio.

[0080] In the fourth step, in response to determining that the average wall temperature of the secondary main nozzle is greater than or equal to the lower limit value of the second main nozzle wall temperature and less than or equal to the upper limit value of the second main nozzle wall temperature, a target secondary equivalence ratio is generated according to the initial secondary equivalence ratio.

[0081] In some optional implementations of some embodiments, according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the third-stage main nozzle wall temperature information, the execution subject may adjust the initial third-stage equivalence ratio through the following steps to obtain a target third-stage equivalence ratio:

[0082] The first step is to determine whether the average wall temperature of the three-stage main nozzle is greater than or equal to the lower limit of the wall temperature of the second main nozzle and less than or equal to the upper limit of the wall temperature of the second main nozzle.

[0083] In the second step, in response to determining that the average wall temperature of the above-mentioned three-stage main nozzle is less than the lower limit value of the wall temperature of the above-mentioned second main nozzle, the above-mentioned initial three-stage equivalence ratio is increased according to the above-mentioned standard nitrogen oxide emission equivalence ratio range information to obtain the target three-stage equivalence ratio.

[0084] In the third step, in response to determining that the average wall temperature of the three-stage main nozzle is greater than the upper limit value of the second main nozzle wall temperature, the initial three-stage equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain the target three-stage equivalence ratio.

[0085] In the fourth step, in response to determining that the average wall temperature of the three-stage main nozzle is greater than or equal to the lower limit value of the second main nozzle wall temperature and less than or equal to the upper limit value of the second main nozzle wall temperature, a target three-stage equivalence ratio is generated according to the initial three-stage equivalence ratio.

[0086] In the process of adopting technical solutions to solve the above technical problems, the following technical problem three often accompanies it: when the wall temperature difference between main nozzles of different levels is large, the wall temperature distribution of the main nozzle is uneven, resulting in the generation of internal thermal stress, which may cause thermal fatigue of the material under long-term action, thereby affecting the structural integrity and service life of the nozzle. In response to the above technical problem three, the conventional solution is generally to set a cooling device around the nozzle or adopt an internal cooling structure to reduce the temperature of the nozzle wall and improve its thermal stability. However, the above conventional solution still has the following problem: it can only cool down all the main nozzles uniformly, and it is impossible to cool down the area with high wall temperature separately, which will still cause uneven wall temperature distribution of the main nozzle.

[0087] Considering the problems of the above conventional solutions, facing the above technical problem 2: when the wall temperature difference between main nozzles of different levels is large, the wall temperature distribution of the main nozzle is uneven, resulting in the generation of internal thermal stress, which may cause thermal fatigue of the material under long-term action, thereby affecting the structural integrity and service life of the nozzle. Combined with the current technical status, it can be decided to adopt the following solution:

[0088] In some optional implementations of some embodiments, according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the secondary main nozzle wall temperature information, the execution entity may adjust the initial secondary equivalence ratio through the following steps to obtain a target secondary equivalence ratio:

[0089] In the first step, the average wall temperature of the secondary main nozzle and the average wall temperature of the tertiary main nozzle are determined as the average main nozzle wall temperature.

[0090] In the second step, the absolute value of the difference between the average wall temperature of the secondary main nozzle and the average main nozzle wall temperature is determined as the secondary main nozzle wall temperature information difference.

[0091] The third step is to determine whether the secondary main nozzle wall temperature information difference is greater than the preset main nozzle wall temperature difference. The preset main nozzle wall temperature difference may be a preset maximum difference between the average wall temperature of the secondary main nozzle wall temperature or the average wall temperature of the tertiary main nozzle wall temperature and the average main nozzle wall temperature while ensuring the uniformity of the main nozzle temperature. For example, the preset main nozzle wall temperature difference may be 5°C.

[0092] In the fourth step, in response to determining that the above-mentioned secondary main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference, the above-mentioned initial secondary equivalence ratio is reduced according to the second standard main nozzle wall temperature range information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned secondary main nozzle wall temperature average wall temperature to obtain the target secondary equivalence ratio.

[0093] In some optional implementations of some embodiments, according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the third-stage main nozzle wall temperature information, the execution subject may adjust the initial third-stage equivalence ratio through the following steps to obtain a target third-stage equivalence ratio:

[0094] In the first step, the absolute value of the difference between the average wall temperature of the three-stage main nozzle and the average main nozzle wall temperature is determined as the three-stage main nozzle wall temperature information difference.

[0095] The second step is to determine whether the temperature information difference of the three-stage main nozzle wall is greater than the preset main nozzle wall temperature difference.

[0096] The third step, in response to determining that the above-mentioned three-stage main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference, the above-mentioned initial three-stage equivalence ratio is reduced according to the second standard main nozzle wall temperature range information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned three-stage main nozzle wall temperature average wall temperature to obtain the target three-stage equivalence ratio.

[0097] The above-mentioned relevant contents of the adjustment of the initial secondary equivalence ratio and the initial tertiary equivalence ratio serve as an inventive point of the embodiments of the present disclosure, and solve the third technical problem "When the wall temperature difference between the main nozzles of different levels is large, the wall temperature distribution of the main nozzle is uneven, resulting in the generation of internal thermal stress, which may cause thermal fatigue of the material under long-term action, and further affect the structural integrity and service life of the nozzle". The reasons that affect the structural integrity and service life of the nozzle are as follows: When the wall temperature difference between the main nozzles of different levels is large, the wall temperature distribution of the main nozzle is uneven, resulting in the generation of internal thermal stress, which may cause thermal fatigue of the material under long-term action. If the above factors are solved, the impact on the structural integrity and service life of the nozzle can be reduced. In order to achieve this effect, the combustion chamber equivalence ratio adjustment method disclosed in the present invention can determine the average value of the above-mentioned secondary main nozzle wall temperature average wall temperature and the above-mentioned tertiary main nozzle wall temperature average wall temperature as the average main nozzle wall temperature; determine the absolute value of the difference between the above-mentioned secondary main nozzle wall temperature average wall temperature and the above-mentioned average main nozzle wall temperature as the secondary main nozzle wall temperature information difference; determine whether the above-mentioned secondary main nozzle wall temperature information difference is greater than the preset main nozzle wall temperature difference; in response to determining that the above-mentioned secondary main nozzle wall temperature information difference is greater than the above-mentioned preset main nozzle wall temperature difference, according to the second standard main nozzle wall temperature range information, the above-mentioned standard nitrogen oxide emission equivalence ratio range information and the above-mentioned secondary main nozzle wall temperature average wall temperature, reduce the above-mentioned initial secondary equivalence ratio to obtain the target secondary equivalence ratio. The absolute value of the difference between the average wall temperature of the three-level main nozzle wall temperature and the average main nozzle wall temperature is determined as the three-level main nozzle wall temperature information difference; determine whether the three-level main nozzle wall temperature information difference is greater than the preset main nozzle wall temperature difference; in response to determining that the three-level main nozzle wall temperature information difference is greater than the preset main nozzle wall temperature difference, according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the three-level main nozzle wall temperature average wall temperature, the initial three-level equivalence ratio is reduced to obtain the target three-level equivalence ratio. Thus, by comparing the secondary main nozzle or the tertiary main nozzle with the average main nozzle wall temperature, when the secondary main nozzle or the tertiary main nozzle is higher than the average main nozzle wall temperature, the equivalence ratio of the main nozzle with a higher wall temperature is adjusted, thereby reducing the corresponding main nozzle wall temperature, thereby improving the uniformity of the main nozzle wall temperature distribution, reducing the generation of internal thermal stress, and thereby ensuring the structural integrity of the nozzle and increasing its service life.

[0098] In the process of adopting technical solutions to solve the above technical problems, the following technical problem 2 is often accompanied: when the airflow passes through obstacles inside the combustion chamber, or is affected by the gas concentration and temperature, the gas will also undergo changes such as compression and expansion, thereby causing flow disturbances, resulting in flame instability, and leading to low combustion efficiency. For the above technical problem 2, the conventional solution is generally to reduce the pressure-driven energy and increase the dissipation of pulsating mechanical energy. However, the above conventional solution still has the following problem: when reducing the pressure-driven energy and reducing the dissipation of pulsating mechanical energy, the combustion efficiency is still low.

[0099] Considering the problems of the above conventional solutions, facing the above technical problem 2: when the airflow passes through the obstacles inside the combustion chamber, or is affected by the gas concentration and temperature, the gas will also undergo changes such as compression and expansion, which will cause flow disturbances, resulting in unstable flames and low combustion efficiency. Combined with the current technical status, it can be decided to adopt the following solutions:

[0100] Optionally, the primary main nozzle wall temperature information may include the wall temperatures of each primary main nozzle, the secondary main nozzle wall temperature information may include the wall temperatures of each secondary main nozzle, and the tertiary main nozzle wall temperature information may include the wall temperatures of each tertiary main nozzle.

[0101] In some optional implementations of some embodiments, based on the first-stage main nozzle wall temperature information, the second-stage main nozzle wall temperature information, the third-stage main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the execution subject may adjust the initial first-stage equivalence ratio, the initial second-stage equivalence ratio and the initial third-stage equivalence ratio respectively through the following steps to obtain a target first-stage equivalence ratio, a target second-stage equivalence ratio and a target third-stage equivalence ratio:

[0102] The first step is to obtain the combustion pressure pulsation amplitude through the associated dynamic pressure sensor. The dynamic pressure sensor can be arranged at the connection between the flame tube and the main nozzle. The dynamic pressure sensor can be used to detect the combustion pressure pulsation amplitude.

[0103] The second step is to obtain the main nozzle intake temperature collected by the associated intake thermocouple. The intake thermocouple may be a thermocouple arranged at the combustion chamber inlet temperature measurement point. For example, the intake thermocouple may be a K-type armored thermocouple.

[0104] The third step is to obtain the combustion chamber outlet temperature set collected by the associated outlet temperature measuring rake. The outlet temperature measuring rake may be a thermocouple arranged at the combustion chamber outlet. For example, the intake thermocouple may be an integrated temperature measuring rake of 12 S-type thermocouples.

[0105] In the fourth step, the average value of the outlet temperatures of each combustion chamber in the above combustion chamber outlet temperature set is determined as the average outlet temperature of the combustion chamber.

[0106] Step 5: Select the combustion chamber outlet temperature that meets the preset combustion chamber outlet temperature condition from the above combustion chamber outlet temperature to obtain the target combustion chamber outlet temperature. The above preset main nozzle inlet temperature may be a preset main nozzle inlet temperature. For example, the above preset main nozzle inlet temperature may be a set value of 670K for a 30MW pure hydrogen gas turbine.

[0107] In the sixth step, the absolute value of the difference between the above-mentioned average combustion chamber outlet temperature and the above-mentioned target combustion chamber outlet temperature is determined as the combustion chamber outlet temperature difference.

[0108] In the seventh step, the difference between the average temperature at the combustion chamber outlet and the main nozzle inlet temperature is determined as the inlet and outlet temperature difference.

[0109] Step 8: Generate a combustion chamber outlet circumferential temperature distribution coefficient based on the combustion chamber outlet temperature difference and the inlet and outlet temperature difference. In practice, the execution subject may determine the combustion chamber outlet circumferential temperature distribution coefficient as the ratio of the combustion chamber outlet temperature difference to the inlet and outlet temperature difference.

[0110] The ninth step is to adjust the initial secondary equivalence ratio and the initial tertiary equivalence ratio according to the combustion chamber outlet circumferential temperature distribution coefficient, the combustion pressure pulsation amplitude, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information to obtain the target secondary equivalence ratio and the target tertiary equivalence ratio. In practice, in response to determining that the combustion chamber outlet circumferential temperature distribution coefficient is greater than the preset outlet temperature circumferential temperature distribution coefficient, or determining that the combustion pressure pulsation amplitude is greater than the preset combustion pressure pulsation amplitude, the execution body adjusts the initial secondary equivalence ratio and the initial tertiary equivalence ratio to obtain the target secondary equivalence ratio and the target tertiary equivalence ratio. Among them, the preset outlet temperature circumferential temperature distribution coefficient can be 0.15. The preset combustion pressure pulsation amplitude can be 7kPa. As an example, the above-mentioned execution entity can reduce the above-mentioned initial secondary equivalence ratio and increase the above-mentioned initial third-level equivalence ratio, or increase the above-mentioned initial secondary equivalence ratio and reduce the above-mentioned initial third-level equivalence ratio, so as to adjust the above-mentioned initial secondary equivalence ratio and the above-mentioned initial third-level equivalence ratio to obtain the target secondary equivalence ratio and the target third-level equivalence ratio.

[0111] The above-mentioned relevant contents of the adjustment of the initial secondary equivalence ratio and the initial tertiary equivalence ratio serve as an inventive point of the embodiments of the present disclosure, and solve the second technical problem "When the airflow passes through the obstacles inside the combustion chamber, or is affected by the gas concentration and temperature, the gas will also undergo changes such as compression and expansion, thereby causing flow disturbances, resulting in flame instability, and leading to low combustion efficiency". The reasons for the low combustion efficiency are as follows: When the airflow passes through the obstacles inside the combustion chamber, or is affected by the gas concentration and temperature, the gas will also undergo changes such as compression and expansion, thereby causing flow disturbances, resulting in flame instability. If the above factors are resolved, the combustion efficiency can be improved. In order to achieve this effect, the combustion chamber equivalence ratio adjustment method disclosed in the present invention can obtain the combustion pressure pulsation amplitude through the associated dynamic pressure sensor; obtain the main nozzle intake temperature collected by the associated intake thermocouple; obtain the combustion chamber outlet temperature set collected by the associated outlet temperature measuring rake; determine the average value of each combustion chamber outlet temperature in the above combustion chamber outlet temperature set as the combustion chamber outlet average temperature; filter out the combustion chamber outlet temperature that meets the preset combustion chamber outlet temperature condition from the above combustion chamber outlet temperature set to obtain the target combustion chamber outlet temperature; compare the above combustion chamber outlet average temperature with the above target combustion chamber outlet temperature The absolute value of the difference in the temperature at the combustion chamber outlet is determined as the combustion chamber outlet temperature difference; the difference between the above combustion chamber outlet average temperature and the above main nozzle inlet temperature is determined as the inlet and outlet temperature difference; the combustion chamber outlet circumferential temperature distribution coefficient is generated according to the above combustion chamber outlet temperature difference and the above inlet and outlet temperature difference; the above initial secondary equivalence ratio and the above initial tertiary equivalence ratio are adjusted according to the above combustion chamber outlet circumferential temperature distribution coefficient, the above combustion pressure pulsation amplitude, the above second standard main nozzle wall temperature interval information and the above standard nitrogen oxide emission equivalence ratio range information to obtain the target secondary equivalence ratio and the target tertiary equivalence ratio. Therefore, since the combustion oscillation of the combustion chamber is mostly circumferential waves, the secondary and tertiary equivalence ratios of the main nozzle are adjusted according to the combustion chamber outlet circumferential temperature distribution coefficient and the combustion pressure pulsation amplitude to destroy the combustion circumferential oscillation of the combustion chamber, thereby reducing the combustion oscillation of the combustion chamber, thereby reducing the flow disturbance, improving the flame stability, and improving the combustion efficiency.

[0112] Step 106, controlling the gas turbine to perform a combustion chamber equivalence ratio adjustment operation according to the target primary equivalence ratio, the target secondary equivalence ratio, and the target tertiary equivalence ratio.

[0113] In some embodiments, the execution subject may control the gas turbine to perform a combustion chamber equivalence ratio adjustment operation according to the target primary equivalence ratio, the target secondary equivalence ratio, and the target tertiary equivalence ratio. In practice, the execution subject may adjust the equivalence ratio of the primary main nozzle in the gas turbine to the target primary equivalence ratio, adjust the equivalence ratio of the secondary main nozzle in the gas turbine to the target secondary equivalence ratio, and adjust the equivalence ratio of the tertiary main nozzle in the gas turbine to the target tertiary equivalence ratio.

[0114] The above-mentioned embodiments of the present disclosure have the following beneficial effects: through the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure, the combustion chamber equivalence ratio of the gas turbine can be adjusted within an appropriate range, the primary, secondary and tertiary partition fuel amounts of the main nozzles of each working condition can be reasonably allocated, and the primary, secondary and tertiary partition equivalence ratios of the main nozzles can be controlled to reduce nitrogen oxide emissions as much as possible, thereby reducing environmental pollution. Specifically, the cause of environmental pollution is that the combustion chamber equivalence ratio has a certain influence on the nitrogen oxides produced after combustion. Only the structural modification of the nozzle is performed without considering the size of the combustion chamber equivalence ratio. When the combustion chamber equivalence ratio is relatively large, it will still cause pollutant emissions from the gas turbine. Based on this, the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure first obtains the primary fuel mass flow, the secondary fuel mass flow and the tertiary fuel mass flow collected by the associated primary flow meter, the secondary flow meter and the tertiary flow meter respectively. Secondly, according to the above-mentioned primary fuel mass flow, the above-mentioned secondary fuel mass flow and the above-mentioned tertiary fuel mass flow, the initial primary equivalence ratio, the initial secondary equivalence ratio and the initial tertiary equivalence ratio are generated. Then, based on the target main combustion zone temperature range information, the standard nitrogen oxide emission equivalence ratio range information is generated. After that, the first-level main nozzle wall temperature information, the second-level main nozzle wall temperature information and the third-level main nozzle wall temperature information respectively collected by the associated first-level temperature detection device, the second-level temperature detection device and the third-level temperature detection device are obtained. Then, based on the above-mentioned first-level main nozzle wall temperature information, the above-mentioned second-level main nozzle wall temperature information, the above-mentioned third-level main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the above-mentioned initial first-level equivalence ratio, the above-mentioned initial second-level equivalence ratio and the above-mentioned initial third-level equivalence ratio are adjusted and processed respectively to obtain the target first-level equivalence ratio, the target second-level equivalence ratio and the target third-level equivalence ratio. Finally, based on the above-mentioned target first-level equivalence ratio, the above-mentioned target second-level equivalence ratio and the above-mentioned target third-level equivalence ratio, the gas turbine is controlled to perform the combustion chamber equivalence ratio adjustment operation. Because the emission of nitrogen oxides is closely related to the temperature of the main combustion zone, the equivalence ratio range for low nitrogen oxide emissions can be determined through the relationship between the main combustion zone temperature, nitrogen oxide emissions and equivalence ratio. Also, based on the standard main nozzle wall temperature range information, the wall temperature of each main nozzle is controlled by adjusting the equivalence ratio, thereby ensuring that the main nozzle wall temperature does not exceed the temperature, that is, the outlet temperature of each main nozzle does not exceed the temperature, further achieving the purpose of reducing nitrogen oxide emissions. Therefore, the combustion chamber equivalence ratio adjustment method of some embodiments of the present disclosure can adjust the equivalence ratio of the gas turbine combustion chamber within an appropriate range, reasonably allocate the fuel amount of the primary, secondary and tertiary partitions of the main nozzles in each working condition, control the equivalence ratio of the primary, secondary and tertiary partitions of the main nozzles, and reduce nitrogen oxide emissions as much as possible, thereby reducing environmental pollution.

[0115] Figure 2It is a schematic structural diagram of some embodiments of the main nozzle included in the combustion chamber applied to the gas turbine of the present disclosure. Figure 2 It includes a main nozzle 1 , a primary main nozzle 11 , a secondary main nozzle 12 , a tertiary main nozzle 13 , a primary temperature detection device 111 , a secondary temperature detection device 121 and a tertiary temperature detection device 131 .

[0116] Figure 3 It is a schematic structural diagram of some embodiments of the temperature detection device provided in the main nozzle included in the combustion chamber of the gas turbine according to the present disclosure. Figure 3 A primary temperature detection device 111 is included.

[0117] Figure 4 It is a schematic structural diagram of some embodiments of the combustion chamber of the present disclosure applied to a gas turbine. Figure 4 It includes a main nozzle 1, a flame tube 2 and a dynamic pressure sensor 3.

[0118] Figure 5 It is a schematic diagram of the structure of some embodiments of the dynamic pressure sensor included in the combustion chamber of the gas turbine according to the present disclosure. Figure 5 A dynamic pressure sensor 3 is included.

[0119] In some embodiments, the combustion chamber may include a flame tube 2 and a main nozzle 1. The flame tube 2 may be connected to one side of the main nozzle 1. The main nozzle 1 may include a primary main nozzle 11, a secondary main nozzle 12, and a tertiary main nozzle 13. A primary temperature detection device 111 may be provided on the primary main nozzle 11. A secondary temperature detection device 121 may be provided on the secondary main nozzle 12, and a tertiary temperature detection device 131 may be provided on the tertiary main nozzle 13. The primary temperature detection device 111, the secondary temperature detection device 121, and the tertiary temperature detection device 131 may all be thermocouples.

[0120] Optionally, a dynamic pressure sensor 3 may be provided on the flame tube 2. The dynamic pressure sensor 3 may be used to detect the combustion pressure pulsation amplitude.

[0121] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A method for adjusting a combustion chamber equivalence ratio, comprising: Obtaining the primary fuel mass flow rate, the secondary fuel mass flow rate and the tertiary fuel mass flow rate respectively collected by the associated primary flow meter, the secondary flow meter and the tertiary flow meter; generating an initial primary equivalence ratio, an initial secondary equivalence ratio, and an initial tertiary equivalence ratio according to the primary fuel mass flow rate, the secondary fuel mass flow rate, and the tertiary fuel mass flow rate; Generate standard nitrogen oxide emission equivalent ratio range information according to target main combustion zone temperature range information; Obtaining the primary main nozzle wall temperature information, the secondary main nozzle wall temperature information and the tertiary main nozzle wall temperature information respectively collected by the associated primary temperature detection device, the secondary temperature detection device and the tertiary temperature detection device; According to the first-stage main nozzle wall temperature information, the second-stage main nozzle wall temperature information, the third-stage main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information, the initial first-stage equivalence ratio, the initial second-stage equivalence ratio and the initial third-stage equivalence ratio are adjusted respectively to obtain a target first-stage equivalence ratio, a target second-stage equivalence ratio and a target third-stage equivalence ratio; Controlling the gas turbine to perform a combustion chamber equivalence ratio adjustment operation according to the target primary equivalence ratio, the target secondary equivalence ratio, and the target tertiary equivalence ratio; Wherein, generating an initial primary equivalence ratio, an initial secondary equivalence ratio and an initial tertiary equivalence ratio according to the primary fuel mass flow rate, the secondary fuel mass flow rate and the tertiary fuel mass flow rate comprises: Determine the primary air distribution ratio coefficient, the secondary air distribution ratio coefficient and the tertiary air distribution ratio coefficient corresponding to the primary main nozzle, the secondary main nozzle and the tertiary main nozzle respectively; generating an initial primary equivalence ratio according to the primary air distribution ratio coefficient, the primary fuel mass flow rate, the air mass flow rate, the air density and the fuel density; generating an initial secondary equivalence ratio according to the secondary air distribution ratio coefficient, the secondary fuel mass flow rate, the air mass flow rate, the air density and the fuel density; An initial three-stage equivalence ratio is generated according to the three-stage air distribution ratio coefficient, the three-stage fuel mass flow rate, the air mass flow rate, the air density and the fuel density.

2. The method according to claim 1, wherein: The target main combustion zone temperature range information is generated by the following steps: Obtaining a main combustion zone temperature sequence, a nitrogen oxide emission sequence, and a main combustion zone equivalence ratio sequence within a preset time period; Performing curve fitting processing on the main combustion zone temperature sequence and the nitrogen oxide emission sequence to obtain temperature nitrogen oxide characteristic curve information; Performing curve fitting processing on the main combustion zone temperature sequence and the main combustion zone equivalence ratio sequence to obtain temperature equivalence ratio characteristic curve information; generating a main combustion zone temperature upper limit value according to the standard nitrogen oxide emission and the temperature nitrogen oxide characteristic curve information; Generate a lower limit value of the main combustion zone temperature according to the standard equivalence ratio threshold and the temperature equivalence ratio characteristic curve information; The target main combustion zone temperature range information is determined according to the main combustion zone temperature upper limit value and the main combustion zone temperature lower limit value.

3. The method according to claim 1, wherein: The first-level main nozzle wall temperature information includes the wall temperature of each first-level main nozzle, the second-level main nozzle wall temperature information includes the wall temperature of each second-level main nozzle, and the third-level main nozzle wall temperature information includes the wall temperature of each third-level main nozzle; and adjusting the initial primary equivalence ratio, the initial secondary equivalence ratio and the initial tertiary equivalence ratio respectively according to the primary main nozzle wall temperature information, the secondary main nozzle wall temperature information, the tertiary main nozzle wall temperature information, the first standard main nozzle wall temperature interval information, the second standard main nozzle wall temperature interval information and the standard nitrogen oxide emission equivalence ratio range information to obtain a target primary equivalence ratio, a target secondary equivalence ratio and a target tertiary equivalence ratio, including: Determine first standard main nozzle wall temperature interval information and second standard main nozzle wall temperature interval information according to the standard nitrogen oxide emission equivalence ratio range information; Determine the average value of the wall temperatures of each primary main nozzle as the primary main nozzle average wall temperature; Determine the average value of the wall temperatures of each secondary main nozzle as the secondary main nozzle average wall temperature; Determine the average value of the wall temperatures of each of the three-stage main nozzles as the three-stage main nozzle average wall temperature; According to the first standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the first-stage main nozzle average wall temperature, the initial first-stage equivalence ratio is adjusted to obtain a target first-stage equivalence ratio; According to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the secondary main nozzle average wall temperature, the initial secondary equivalence ratio is adjusted to obtain a target secondary equivalence ratio; According to the second standard main nozzle wall temperature range information, the standard nitrogen oxide emission equivalence ratio range information and the three-stage main nozzle average wall temperature, the initial three-stage equivalence ratio is adjusted to obtain a target three-stage equivalence ratio.

4. The method according to claim 3, wherein: The first standard main nozzle wall temperature interval information includes a first main nozzle wall temperature lower limit value and a first main nozzle wall temperature upper limit value, and the second standard main nozzle wall temperature interval information includes a second main nozzle wall temperature lower limit value and a second main nozzle wall temperature upper limit value; And the initial primary equivalence ratio is adjusted according to the first standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the primary main nozzle average wall temperature to obtain a target primary equivalence ratio, including: Determine whether the average wall temperature of the primary main nozzle is greater than or equal to the lower limit value of the wall temperature of the first main nozzle and less than or equal to the upper limit value of the wall temperature of the first main nozzle; In response to determining that the average wall temperature of the first-stage main nozzle is less than the lower limit value of the first main nozzle wall temperature, the initial first-stage equivalence ratio is increased according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target first-stage equivalence ratio; In response to determining that the average wall temperature of the first-stage main nozzle is greater than the upper limit value of the first main nozzle wall temperature, the initial first-stage equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target first-stage equivalence ratio; In response to determining that the primary main nozzle average wall temperature is greater than or equal to the first main nozzle wall temperature lower limit value and less than or equal to the first main nozzle wall temperature upper limit value, a target primary main nozzle equivalence ratio is generated according to an initial primary main nozzle equivalence ratio.

5. The method according to claim 4, wherein: The adjusting process of the initial secondary equivalence ratio according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the secondary main nozzle average wall temperature to obtain the target secondary equivalence ratio includes: Determine whether the average wall temperature of the secondary main nozzle is greater than or equal to the lower limit value of the wall temperature of the second main nozzle and less than or equal to the upper limit value of the wall temperature of the second main nozzle; In response to determining that the average wall temperature of the secondary main nozzle is less than the lower limit value of the wall temperature of the second main nozzle, the initial secondary equivalence ratio is increased according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target secondary equivalence ratio; In response to determining that the average wall temperature of the secondary main nozzle is greater than the upper limit value of the wall temperature of the second main nozzle, the initial secondary equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target secondary equivalence ratio; In response to determining that the secondary main nozzle average wall temperature is greater than or equal to the second main nozzle wall temperature lower limit value and less than or equal to the second main nozzle wall temperature upper limit value, a target secondary equivalence ratio is generated according to the initial secondary equivalence ratio.

6. The method according to claim 5, wherein: The adjusting process of the initial three-stage equivalence ratio according to the second standard main nozzle wall temperature interval information, the standard nitrogen oxide emission equivalence ratio range information and the three-stage main nozzle average wall temperature to obtain the target three-stage equivalence ratio includes: Determine whether the average wall temperature of the tertiary main nozzle is greater than or equal to the lower limit value of the wall temperature of the second main nozzle and less than or equal to the upper limit value of the wall temperature of the second main nozzle; In response to determining that the average wall temperature of the third-stage main nozzle is less than the lower limit value of the wall temperature of the second main nozzle, the initial third-stage equivalence ratio is increased according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target third-stage equivalence ratio; In response to determining that the average wall temperature of the third-stage main nozzle is greater than the upper limit value of the wall temperature of the second main nozzle, the initial third-stage equivalence ratio is reduced according to the standard nitrogen oxide emission equivalence ratio range information to obtain a target third-stage equivalence ratio; In response to determining that the tertiary main nozzle average wall temperature is greater than or equal to the second main nozzle wall temperature lower limit value and less than or equal to the second main nozzle wall temperature upper limit value, a target tertiary equivalence ratio is generated according to the initial tertiary equivalence ratio.

7. A combustion chamber applied to a gas turbine, used to implement the combustion chamber equivalence ratio adjustment method according to any one of claims 1 to 6, wherein: The combustion chamber includes a flame tube and a main nozzle; The flame tube is connected to one side of the main nozzle, and the main nozzle includes a first-level main nozzle, a second-level main nozzle and a third-level main nozzle. The first-level main nozzle is provided with a first-level temperature detection device, the second-level main nozzle is provided with a second-level temperature detection device, and the third-level main nozzle is provided with a third-level temperature detection device.

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