CN113432149A - Test verification method and system for fuel nozzle modification - Google Patents
Test verification method and system for fuel nozzle modification Download PDFInfo
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- CN113432149A CN113432149A CN202110741617.9A CN202110741617A CN113432149A CN 113432149 A CN113432149 A CN 113432149A CN 202110741617 A CN202110741617 A CN 202110741617A CN 113432149 A CN113432149 A CN 113432149A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
Abstract
The invention discloses a test verification method and a test verification system for fuel nozzle modification, which belong to the technical field of gas turbine tests. The feasibility of changing a gas turbine from a fuel nozzle fueled by oil to a natural gas nozzle fueled by gas was demonstrated by using the test results to correct for variations in nozzle retrofit design, manufacturing. The method corrects the nozzle modification design through test data, and ensures that the natural gas nozzle can meet the overall requirements of the gas turbine. The method can also be widely used for the modification test verification of other types of nozzles, and has the advantages of wide application range, strong applicability and strong engineering application value.
Description
Technical Field
The invention belongs to the technical field of gas turbine tests, and relates to a test verification method and a system for fuel nozzle modification.
Background
The nozzle is an important component of the combustion chamber of the gas turbine, is used for supplying and atomizing fuel, is an important item in the design of the combustion chamber, and the performance of the nozzle has great influence on the combustion process. The fuel is injected into the combustion chamber through the nozzle, and is mixed with the entering air to form combustible mixed gas, and the fuel is ensured to be stably combusted in the combustion chamber. Because the gas fuel has the characteristics of cleanness, easy combustion after being mixed with air, better organization of combustion and the like, the fuel of the industrial gas turbine is changed from fuel oil into natural gas, the fuel is changed from liquid into gas, the nozzle is designed and modified, and the fuel nozzle is modified into a natural gas nozzle. Meanwhile, the design size of a nozzle of the natural gas nozzle needs to be adjusted through experimental verification, so that the same combustion efficiency and power of the gas turbine taking fuel oil as fuel are achieved. Therefore, the verification of the natural gas nozzle simulation test is the key for changing fuel oil into gas and changing the fuel nozzle into the natural gas nozzle of the gas turbine. There is no experimental validation method in the prior art for fuel nozzle retrofit.
Disclosure of Invention
The invention aims to overcome the defects that the prior art does not have a test verification method about the modification of the fuel nozzle, and provides a test verification method for the modification of the fuel nozzle.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a test verification method for fuel nozzle modification comprises the following steps:
acquiring the pressure flow characteristic of the fuel nozzle, and acquiring the combustion performance of the combustion chamber of the fuel nozzle;
respectively acquiring pressure and flow characteristics of natural gas nozzles with different sizes;
simulating a combustion test of an industrial gas turbine combustion chamber based on the pressure and flow characteristics of natural gas nozzles with different sizes, and acquiring a simulation test result based on test state parameters and measurement parameters;
and comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
Preferably, the calculation of the pressure-flow characteristics of the fuel injection nozzle is as follows:
under different working conditions of the gas turbine, the auxiliary oil way and the main oil way are sequentially supplied with oil with different oil pressure differences, after the oil supply is stable, the corresponding flow is measured, and based on the nozzle atomization effect, a nozzle flow characteristic curve is drawn to obtain a flow formula of the fuel nozzle.
Preferably, during the acquisition of the pressure-flow characteristics of the natural gas nozzle,
and selecting at least three groups of nozzles with different nozzle sizes to perform a flow test under different air supply pressures and air supply pressure differences.
Preferably, clean air is selected as the test fluid medium during the acquisition of the pressure-flow characteristics of the natural gas nozzle.
Further preferably, when the pressure and flow characteristics of the natural gas nozzle are acquired by taking clean air as a test fluid medium, the test result is corrected after the test is finished;
the correction formula is formula (1):
in the formula (1), WgIs the volume flow (m) of natural gas3/s)，WaIs the air volume flow (m)3/s)，RgIs the gas constant (J/kg. K) of natural gas, RaIs the gas constant of air (J/kg. K);
a correction factor of
The natural gas has a flow coefficient of
Preferably, the combustion test specifically measures the temperature of the outlet temperature field of the combustion chamber, the combustion efficiency and the wall temperature of the flame tube under different working conditions.
Preferably, during the combustion test of the simulated industrial gas turbine combustor, at least 3 natural gas nozzles are respectively installed on one flame tube as test objects.
Preferably, the flame test is carried out in a combustion test,
the test state parameters include: working conditions, the temperature of the inlet section of the combustion chamber, the pressure of the inlet section of the combustion chamber, the mass flow of fuel oil and the mass flow of natural gas;
the measurement parameters include: the temperature of the inlet section of the combustion chamber, the pressure of any point in the circumferential direction of the inlet section of the combustion chamber, the mass flow of fuel oil, the mass flow of natural gas, the temperature of the section of any point in the circumferential direction of the outlet section of the combustion chamber and the temperature of any point in the circumferential direction of the wall surface of the flame tube;
the simulation test results include: the unevenness of the temperature field at the outlet of the combustion chamber, the radial unevenness of the outlet of the combustion chamber, the temperature distribution cloud chart at the outlet of the combustion chamber, the combustion efficiency and the temperature distribution of the wall of the flame tube.
The simulation test result specifically refers to the combustion performance of the combustion chamber of the modified natural gas nozzle with different nozzle sizes;
a fuel nozzle retrofit test verification system includes
The fuel nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristic of the fuel nozzle;
the natural gas nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristics of the natural gas nozzles with different sizes;
the combustion test module is used for simulating an industrial gas turbine combustion chamber based on the pressure flow characteristics of the natural gas nozzles with different sizes, carrying out a combustion test, and acquiring a simulation test result based on test state parameters and measurement parameters;
and the judging module is used for comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
Preferably, the combustion test module comprises a temperature detection unit, a pressure detection unit, a flow monitoring unit and a data processing unit;
the temperature detection unit is used for acquiring the temperature of the inlet section of the combustion chamber, the section temperature of any point in the circumferential direction of the outlet section of the combustion chamber and the temperature of any point in the circumferential direction of the wall surface of the flame tube;
the pressure detection unit is used for acquiring the pressure of the inlet section of the combustion chamber and the pressure of any point in the circumferential direction of the inlet section of the combustion chamber;
the flow monitoring unit is used for acquiring the mass flow of the inlet section of the combustion chamber, the mass flow of fuel oil and the mass flow of natural gas;
the data processing unit respectively interacts with the temperature detection unit, the pressure detection unit and the flow monitoring unit, and data processing is carried out on the basis of data acquired by the temperature detection unit, the pressure detection unit and the flow monitoring unit to obtain the unevenness of a temperature field at the outlet of the combustion chamber, the radial unevenness of the outlet of the combustion chamber, a temperature distribution cloud chart at the outlet of the combustion chamber, the combustion efficiency and the wall temperature distribution.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a test verification method for fuel nozzle modification, which is used for preferably selecting a natural gas nozzle by taking the reference performance of liquid fuel combustion of a single-pipe combustion chamber of the fuel nozzle as the reference and comparing the reference performance with the combustion performance of natural gas combustion of single-pipe combustion chambers of natural gas fuel nozzles with different sizes. The feasibility of changing a gas turbine from a fuel nozzle fueled by oil to a natural gas nozzle fueled by gas was demonstrated by using the test results to correct for variations in nozzle retrofit design, manufacturing. The method corrects the nozzle modification design through test data, and ensures that the natural gas nozzle can meet the overall requirements of the gas turbine. The method can also be widely used for the modification test verification of other types of nozzles, and has the advantages of wide application range, strong applicability and strong engineering application value.
The invention also discloses a test verification system for the fuel nozzle modification, which is established based on the method, and is used for simulating the combustion chamber of the industrial gas turbine to perform a combustion test based on the pressure flow characteristics of the natural gas nozzles with different sizes, acquiring a simulation test result based on the test state parameters and the measurement parameters, comparing the simulation test result with the combustion performance of the combustion chamber of the fuel nozzle, and finally obtaining the natural gas nozzle size closest to the combustion performance of the combustion chamber of the fuel nozzle.
Drawings
FIG. 1 is a three-dimensional structure diagram of the wall temperature couple measuring point position;
FIG. 2 is a schematic plan view of the positions of wall temperature couple measuring points;
FIG. 3 is a pressure flow characteristic diagram of the natural gas nozzle A;
FIG. 4 is a pressure flow characteristic diagram of natural gas nozzle B;
fig. 5 is a pressure-flow characteristic diagram of the natural gas nozzle C.
Wherein: 1-main burning hole; 2-mixing holes; 3-ignition torch position.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1
A test verification method for fuel nozzle modification is characterized by comprising the following steps:
acquiring the pressure flow characteristic of a fuel nozzle;
selecting clean air as a test fluid medium to obtain pressure flow characteristics corresponding to the natural gas nozzles with different sizes;
simulating an industrial gas turbine combustion chamber based on natural gas nozzles with different sizes, performing a combustion test, and acquiring a simulation test result based on test state parameters and measurement parameters;
and comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
Example 2
After the fuel nozzle of the gas turbine is transformed into the natural gas nozzle, the natural gas nozzle test verification is carried out in two aspects of a nozzle flow characteristic test and a combustion performance test of a combustion chamber. The method comprises the following steps:
step 1) testing the flow characteristic of the diesel nozzle. The purpose is to obtain the pressure flow characteristic of a diesel nozzle, select-10 # military diesel as a fluid medium, supply oil to an oil circuit I (an auxiliary oil circuit) and an oil circuit II (a main oil circuit) in sequence under different working conditions of a gas turbine by different oil pressure differences, measure corresponding flow after stabilization, observe the atomization effect of the nozzle and draw a nozzle flow characteristic curve to obtain a flow formula.
And 2) testing the flow characteristic of the natural gas nozzle. The purpose is to obtain the pressure flow characteristic of the natural gas nozzle, and because natural gas has great potential safety hazard in a medium test, clean air is selected as a test fluid medium. And selecting three groups of nozzles with different nozzle sizes to perform a flow test under different air supply pressures and air supply pressure differences. After the test is finished, the test result is corrected by using natural gas as a fluid medium, and the correction formula is as follows:
Wgis the volume flow (m) of natural gas3/s)，WaIs the air volume flow (m)3/s)，RgIs the gas constant (J/kg. K) of natural gas, RaIs the gas constant (J/kg. K) of air, and the correction coefficient
When the air is the flow coefficient mua of the medium, the flow coefficient of the natural gas
And 3) testing the combustion performance of the fuel nozzle combustion chamber. The objective is to obtain baseline performance of the fuel nozzle combustion chamber. And measuring the temperature field of the outlet of the combustion chamber and the wall surface temperature of the flame tube under three working conditions. Regulating T3＝400K，P3＝180kPa，W3And (3) adjusting the test state parameters of the combustion chamber after ignition, installing a galvanic couple to measure the outlet temperature field of the combustion chamber, and recording the wall temperature of the flame tube, wherein the ignition nozzle is 0.68 kg/s.
And 4) testing the combustion performance of the natural gas nozzle combustion chamber. The purpose is to obtain the combustion performance of the combustion chambers of the three groups of natural gas nozzles. The natural gas nozzle test simulates an annular tube type combustion chamber of an industrial gas turbine, a fan-shaped test piece of the combustion chamber is used for testing, and A, B, C three groups of natural gas nozzles are respectively arranged on 1 flame tube to serve as test objects.
The test state parameters were selected as: working condition N and combustion chamber inlet section temperature T3Inlet cross-sectional pressure P of combustion chamber3Mass flow W of the combustion chamber inlet cross section3Mass flow W of fuelfMass flow W of natural gasg。
Measuring parameters: combustion chamber inlet cross-sectional temperature T3Circumferential ith point pressure P of inlet section of combustion chamber3iMass flow W of the combustion chamber inlet cross section3Mass flow W of fuelfMass flow W of natural gasgCircumferential ith point section temperature T of outlet of combustion chamber4iCircumferential ith ignition flame tube wall temperature Twi。
The measurement results are finally provided: the method comprises the steps of OTDF (optical time Domain reflectometry) of the unevenness of an outlet temperature field, RTDF (radial unevenness distribution) of an outlet, collecting an outlet temperature distribution cloud chart, combustion efficiency eta and wall temperature distribution measured by temperature indicating paint.
And 5) comparing the test result with the combustion performance of the diesel nozzle combustion chamber, preferably selecting the size of the natural gas nozzle closest to the combustion efficiency of the fuel nozzle combustion chamber, and correcting the designed size of the diameter of the natural gas nozzle spout.
Example 3
A test verification method for fuel nozzle modification comprises the following steps:
the first step is as follows: the experiment was conducted using 3 sets of natural gas nozzle tips, each set having a different individual nozzle diameter, A, B, C. Taking a circular-tube type combustion chamber as an example, a combustion chamber fan test piece test and a No. 10 military diesel oil as fuel are used for a performance test of a fuel nozzle combustion chamber, and flow characteristic parameters are shown in a table 1.
TABLE 1 Fuel nozzle pressure flow characteristic test parameters
According to the measurement result of the thermocouple on the wall surface of the flame tube at the 12 point of the diesel nozzle combustion chamber, 4 points are buried in the high-temperature area on the wall surface, 16 points of wall temperature thermocouples are counted, and the gas fuel nozzle is replaced to carry out the performance test of the combustion chamber taking natural gas as fuel. As shown in fig. 1 and 2.
The second step is that: according to the test results of the pressure flow characteristics of the natural gas nozzle under different working conditions, referring to table 2, a pressure flow characteristic diagram of the natural gas nozzle is obtained, and the results are shown in fig. 3, fig. 4 and fig. 5. The flow rate of the same natural gas nozzle is not only related to the pressure difference between the front and the back of the nozzle, but also related to the pressure in front of the nozzle. When the pressure is the same in front of the nozzle,
linearly with flow. And comparing the actual flow and the designed flow of the natural gas nozzle under the conditions of the same nozzle pressure and the pressure difference between the front and the back of the nozzle, and selecting the natural gas nozzle with smaller deviation between the actual flow and the designed flow.
Table 2 natural gas nozzle test data
The third step: combustion Chamber Performance test A first combustion chamber performance test was conducted on-10 # military diesel fuel, and then a second combustion chamber performance test was conducted on natural gas fuel by replacing three sets of natural gas nozzles, respectively. And analyzing and comparing the data of the-10 # diesel nozzle and the data of the-natural gas nozzle such as wall temperature, outlet temperature field, combustion efficiency and the like, and further preferably selecting the optimal nozzle design. And finally, replacing the total temperature measuring rake at the outlet of the combustion chamber with a gas sampling rake, carrying out a third combustion performance test, and measuring and preferably selecting the combustion efficiency of the natural gas nozzle combustion chamber with one size by using a gas analysis method.
The fourth step: in comparing the combustor performance of the natural gas nozzle with the diesel nozzle, the calculation of the outlet average temperature, the outlet temperature distribution coefficient, and the outlet radial non-uniformity is based on measured data for the middle six circumferential positions.
The most preferable option is to analyze the temperature distribution coefficient of the outlets of the three groups of natural gas nozzles and the group with smaller difference between the radial unevenness of the outlets and the gas nozzles.
And the outlet temperature distribution cloud pictures are respectively collected when the working conditions are 0.2, 0.58 and 1, and the outlet temperature field cloud pictures of the combustion chamber adopting a diesel nozzle and three groups of natural gas nozzles are adopted in the test state. As a result, it was found that: A) the outlet temperature distribution of the natural gas nozzle is not as uniform as that of the diesel nozzle; B) when N is 0.58, a local high-temperature region exists at the outlet of the combustion chamber adopting the natural gas nozzle B; C) the shape of the outlet temperature field of the combustion chamber adopting the natural gas nozzle C is more stable; D) the lower-temperature blue areas are arranged in the middle of the upper edge of the outlet cloud picture, and the reason is that the outlet cavity channel is not in a regular fan shape, and when the temperature measuring rake on the displacement mechanism swings to the middle of the outlet cavity channel, the near outer wall measuring point is closer to the upper edge of the cavity channel.
The wall temperature of the flame tube needs to be blown with sand before the flame tube is sprayed with the temperature indicating paint, so that the temperature indicating paint is guaranteed to have good adhesiveness.
And (4) calculating the combustion efficiency aiming at the natural gas nozzle optimized in the third test.
Through three groups of natural gas nozzles, a flow characteristic test of a No. 10 diesel nozzle and a combustion performance test of a single-pipe combustion chamber, analysis and comparison of data such as flame tube wall temperature, outlet temperature field, combustion efficiency and the like under different working conditions are comprehensively analyzed, and the results are shown in table 3, so that the optimal natural gas nozzle design is optimized.
TABLE 3 Combustion Performance test results
In Table 3, T3avIs the average temperature of the combustion chamber inlet cross section; w3Mass flow of the inlet section of the combustion chamber; p3avThe average pressure of the inlet section of the combustion chamber; wf1The mass flow of fuel oil in a main oil way of the nozzle; wf2The mass flow of the fuel in the auxiliary oil way of the nozzle is; wfIs the fuel mass flow; t iswmaxThe maximum value of the wall surface temperature of the flame tube; t is4maxThe maximum temperature of the outlet section of the combustion chamber; t is4avThe average temperature of the outlet section of the combustion chamber; alpha is the residual gas coefficient of the combustion chamber; OTDF is the temperature distribution coefficient of the outlet of the combustion chamber; RTDF is the radial temperature distribution coefficient of the outlet of the combustion chamber; η is the combustion efficiency.
Example 4
A fuel nozzle retrofit test verification system includes
The fuel nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristic of the fuel nozzle;
the natural gas nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristics of the natural gas nozzles with different sizes;
the combustion test module is used for simulating an industrial gas turbine combustion chamber based on the pressure flow characteristics of the natural gas nozzles with different sizes, carrying out a combustion test, and acquiring a simulation test result based on test state parameters and measurement parameters;
and the judging module is used for comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
The combustion test module comprises a temperature detection unit, a pressure detection unit, a flow monitoring unit and a data processing unit; the temperature detection unit is used for acquiring the temperature of the inlet section of the combustion chamber, the section temperature of any point in the circumferential direction of the outlet section of the combustion chamber and the temperature of any point in the circumferential direction of the wall surface of the flame tube; the pressure detection unit is used for acquiring the pressure of the inlet section of the combustion chamber and the pressure of any point in the circumferential direction of the inlet section of the combustion chamber; the flow monitoring unit is used for acquiring the mass flow of the inlet section of the combustion chamber, the mass flow of fuel oil and the mass flow of natural gas; the data processing unit respectively interacts with the temperature detection unit, the pressure detection unit and the flow monitoring unit, and data processing is carried out on the basis of data acquired by the temperature detection unit, the pressure detection unit and the flow monitoring unit to obtain the unevenness of a temperature field at the outlet of the combustion chamber, the radial unevenness of the outlet of the combustion chamber, a temperature distribution cloud chart at the outlet of the combustion chamber, the combustion efficiency and the wall temperature distribution.
Example 5
In an exemplary embodiment, a computer device is also provided, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the inventive method when executing the computer program. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A test verification method for fuel nozzle modification is characterized by comprising the following steps:
acquiring the pressure flow characteristic of the fuel nozzle, and acquiring the combustion performance of the combustion chamber of the fuel nozzle;
respectively acquiring pressure and flow characteristics of natural gas nozzles with different sizes;
simulating a combustion test of an industrial gas turbine combustion chamber based on the pressure and flow characteristics of natural gas nozzles with different sizes, and acquiring a simulation test result based on test state parameters and measurement parameters;
and comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
2. A fuel nozzle modification test verification method as claimed in claim 1, wherein the pressure-flow characteristics of the fuel nozzle are calculated as follows:
under different working conditions of the gas turbine, the auxiliary oil way and the main oil way are sequentially supplied with oil with different oil pressure differences, after the oil supply is stable, the corresponding flow is measured, and based on the nozzle atomization effect, a nozzle flow characteristic curve is drawn to obtain a flow formula of the fuel nozzle.
3. The method of experimental verification of a fuel injection nozzle modification as set forth in claim 1, wherein, in the acquisition of the pressure-flow characteristics of the natural gas injection nozzle,
and selecting at least three groups of nozzles with different nozzle sizes to perform a flow test under different air supply pressures and air supply pressure differences.
4. The method of claim 1, wherein clean air is selected as the test fluid medium during the acquisition of the pressure-flow characteristics of the natural gas nozzle.
5. The method for testing and verifying the fuel nozzle modification according to claim 4, characterized in that when the pressure flow characteristic of the natural gas nozzle is obtained by using clean air as a test fluid medium, the test result is corrected after the test is finished;
the correction formula is formula (1):
in the formula (1), WgIs the volume flow (m) of natural gas3/s)，WaIs the air volume flow (m)3/s)，RgIs the gas constant (J/kg. K) of natural gas, RaIs the gas constant of air (J/kg.)K)；
A correction factor of
The natural gas has a flow coefficient of
6. The method for testing and verifying the fuel nozzle modification according to claim 1, wherein the combustion test specifically measures the temperature of a combustion chamber outlet temperature field, the combustion efficiency and the temperature of a flame tube wall under different working conditions.
7. The method for testing and verifying the modification of the fuel nozzle as claimed in claim 1, wherein at least 3 natural gas nozzles are respectively installed on one flame tube as test objects in the process of simulating the combustion test of the industrial gas turbine combustor.
8. The method of claim 1, wherein the test condition parameters in the combustion test comprise: working conditions, the temperature of the inlet section of the combustion chamber, the pressure of the inlet section of the combustion chamber, the mass flow of fuel oil and the mass flow of natural gas;
the measurement parameters include: the temperature of the inlet section of the combustion chamber, the pressure of any point in the circumferential direction of the inlet section of the combustion chamber, the mass flow of fuel oil, the mass flow of natural gas, the temperature of the section of any point in the circumferential direction of the outlet section of the combustion chamber and the temperature of any point in the circumferential direction of the wall surface of the flame tube;
the simulation test results include: the unevenness of the temperature field at the outlet of the combustion chamber, the radial unevenness of the outlet of the combustion chamber, the temperature distribution cloud chart at the outlet of the combustion chamber, the combustion efficiency and the temperature distribution of the wall of the flame tube.
9. A test verification system for fuel nozzle modification is characterized by comprising
The fuel nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristic of the fuel nozzle;
the natural gas nozzle pressure flow acquiring module is used for acquiring the pressure flow characteristics of the natural gas nozzles with different sizes;
the combustion test module is used for simulating an industrial gas turbine combustion chamber based on the pressure flow characteristics of the natural gas nozzles with different sizes, carrying out a combustion test, and acquiring a simulation test result based on test state parameters and measurement parameters;
and the judging module is used for comparing the simulation test result with the combustion performance of the fuel nozzle combustion chamber to obtain the size of the natural gas nozzle closest to the combustion performance of the fuel nozzle combustion chamber.
10. The fuel nozzle retrofit test validation system of claim 9, wherein the combustion test module comprises a temperature detection unit, a pressure detection unit, a flow monitoring unit and a data processing unit;
the temperature detection unit is used for acquiring the temperature of the inlet section of the combustion chamber, the section temperature of any point in the circumferential direction of the outlet section of the combustion chamber and the temperature of any point in the circumferential direction of the wall surface of the flame tube;
the pressure detection unit is used for acquiring the pressure of the inlet section of the combustion chamber and the pressure of any point in the circumferential direction of the inlet section of the combustion chamber;
the flow monitoring unit is used for acquiring the mass flow of the inlet section of the combustion chamber, the mass flow of fuel oil and the mass flow of natural gas;
the data processing unit respectively interacts with the temperature detection unit, the pressure detection unit and the flow monitoring unit, and data processing is carried out on the basis of data acquired by the temperature detection unit, the pressure detection unit and the flow monitoring unit to obtain the unevenness of a temperature field at the outlet of the combustion chamber, the radial unevenness of the outlet of the combustion chamber, a temperature distribution cloud chart at the outlet of the combustion chamber, the combustion efficiency and the wall temperature distribution.
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