This standard specifies the measurement device and test procedures for continuous measurement of the concentration of gaseous pollutants from light gas turbines, such as nitrogen oxides (NOx), sulfur dioxide (SO2) and oxygen (O2- for calculation). This standard applies to light gas turbines that operate under long-term fixed conditions. For light gas turbines that operate under frequently changing conditions, the measurement method recommended in Appendix A (reference) should be used. GB/T 11370-1989 Measurement of gaseous pollutants from light gas turbines GB/T11370-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Gas emissions measurement of light weight gas lurhines
1 Subject and scope of application
This standard specifies the test equipment and test procedures for the continuous measurement of the concentration of gaseous pollutants such as oxygen (O2) of light weight gas turbines. GB 1137089
Nitrogen oxides (NOx) and sulfur dioxide (SO2) This standard applies to light weight gas turbines operating under long-term fixed conditions. For light weight gas turbines operating under variable conditions, the measurement method described in Appendix A (reference) should be used. 2 Terminology
2.1 Nitrogen oxides
It is defined as the sum of nitrogen monoxide (NO) and nitrogen dioxide (NO2). 2.2 Continuous sampling
The sample gas containing the component to be measured is continuously passed through the analyzer, and the continuous measurement data of the component is obtained. 2.3 Concentration
The fraction of the component to be measured in a gas mixture. 2.4 Parts per million (PPm)
The number of unit volumes of the base gas in each unit volume of the gas mixture. 2.5 Standard gas
A specially prepared gas mixture of known composition and concentration used to calibrate the instrument. 2.6 Precision
The repeatability of the measured value when a known sample gas is measured under the condition that the instrument adjustment remains unchanged. 2.7 Response
The output signal of the instrument corresponding to the known sample gas concentration. 2.8 Interference
The response of various gas components other than the gas to be measured to the instrument: 2. Noise
Irregular changes in the output signal of the instrument that are unrelated to the sample gas. It is not related to the drift characteristics of the instrument. 2.10 Zero point gas
A gas used to adjust the instrument and establish the zero point or response point of the instrument. 2,11 Zero drift
The change of the instrument zero output over time in the absence of the gas to be tested. 2.12 Standard gas
A high-precision standard push gas used for daily instrument calibration and adjustment. 2.18 Standard drift
National 1--5
. .a1 Implementation
GB11870—B
The change of the instrument response over time when repeated measurements are made at the same standard gas flow rate and concentration. 3 Test method
3.1 Test device
3.1.1 Sampling and analysis system See Figure 1.
Analyzer
Backflush air
Filter|| tt||Water storage device
[Analyzer
Analyzer
1 Sampling channel, 2-zero point gas, 3-standard point gas, 4-zero point gas, 5-standard point gas, 6-internal point gas, 7-zero point gas 3.2 Test instruments, equipment and their requirements
3.2.1 Sampling head
, should be made of stainless steel,
b. Both multi-point mixed sampling head and single-point shift sampling head can be used, but the number of sampling points should not be less than 12 points. If a multi-point mixed sampling head is used, the apertures of the sampling holes on the sampling head are the same and are distributed as evenly as possible, c. At least 8% of the pressure drop through the sampling head components occurs at the sampling holes. The sampling diameter should be determined according to the principle of location. d. Try not to use the lifting type sampling head. If it must be used, control the cooling case so that the sample gas temperature is not lower than 60℃. e: Generally speaking, the sampling head should be installed at least twice the diameter of the exhaust pipe away from the power turbine or any exhaust elbow. The sampling element on the sampling head should be placed against the airflow. 3.2.2 Particle filter
is used to filter out particles from the sample gas. In most cases, it can be combined with the sampling head cabinet and placed in the gas turbine exhaust duct or outside the exhaust duct. However, when the sample gas temperature is higher than 500℃, the filter must be placed outside the exhaust duct. 3.2.3 Calibration valve|| tt||- Two channels are used to introduce zero point gas and calibration point gas into the analysis. 3.2.4 Sampling pipeline
It is made of stainless steel or Teflon material. The pipeline should be as short as possible, and its inner diameter can be 4-10mm. The pipeline should be heated and insulated to ensure that the sample gas temperature is above 30℃ to prevent condensation of the sample gas. 3.2.5 Dehumidifier
It should be able to reduce the dew point of the sample gas to below 3℃. If the analyzer used is not disturbed by water vapor, this component does not need to be placed. 3.2.6 The vacuum pump
should have sufficient suction capacity to ensure that the sample gas passes through the sampling system for less than 10s. At the same time, the pump should ensure sealing and will not promote chemical reactions in the sample gas.
a.2.7 Analyzer
3.2.7.1 Oxygen Analyzer
GB 1187089
Use a rate analyzer to determine the percentage concentration of oxygen in the sample gas. The recommended total range is 0~25%. 1.2.2 Nitrogen Oxide Analyzer
Use a NO analyzer to determine the Ppm concentration of NO in the sample gas. The recommended total range is 0~500ppm. 2.2.7.8 Sulfur Dinitride Analyzer
Use a SO? analyzer to determine the Ppm concentration of SO in the sample gas. The recommended total range is 0~500ppm. 3.2.1.4 Performance requirements for the above three instruments. The accuracy of each range should be less than ± 1% of the full range. The point drift of the instrument should be less than ± 1% of the full range within 2h. b.
The instrument's calibration drift should be less than ± 1% of the full scale within 2 hours. d.
The instrument's noise should be less than ±1% of the full scale. The instrument's linearity should be less than ± 2% of the full scale. e.
The instrument's total interference response should be less than ± 2% of the full scale. g: The instrument's response time, the time from the sample gas being introduced into the instrument's inlet to the instrument indicating 90% of the final reading, should not exceed 15s for NO, and O2, and should not exceed 305 for SO. 3.9 Requirements for standard gases
3.1 Zero point gas
Use high-purity nitrogen, in which the contents of carbon monoxide (CO), NO and SO2 should all be less than 1PPm. 3.2 Calibration gases for oxygen, oxidants and sulfur dioxide They should be: mixed gases of known concentrations with nitrogen as the diluent. The nominal concentrations should be 25%, 50% and 90% of the instrument's full scale, respectively. Among them, the mixed gas with 90% full-scale concentration is used to determine and check the range of the instrument, while the mixed gas with 25% and 50% full-scale concentration is used to check the effectiveness of the instrument calibration before each test. 3.8.3 Oxygen calibration gas
Use air with 20.9% oxygen as the range calibration gas, and use another medium concentration (13% oxygen in nitrogen) calibration gas to check the effectiveness of the instrument calibration before each test.
3.3.4 Unless otherwise required, the accuracy of the calibration gas should generally be within ±2%, and a factory certificate should be provided. 3.4 Test procedure
3.4.1 Test preparation
Tools. Check the sampling pipeline to make sure that the pipeline has no leaks and is not contaminated. When checking the pipeline for leaks, the sampling sensor and analyzer should be disconnected, and the vacuum pump should be operated. The system leakage should be less than 0.1Lmin. 。 Heat the sampling pipeline and connect the power of each instrument to preheat the pipeline and instruments until they reach a thermally stable state. c. Use appropriate seasonal gas to adjust the zero point of each instrument, use the calibration gas with a concentration of 90% of the full scale to adjust the calibration of each instrument, and record the corresponding response value. Www.bzxZ.net
d. Calibrate the instrument with the median calibration gas, and compare the instrument response value with the curve given by the manufacturer or the previously calibrated curve. If the deviation exceeds 2% of the full scale, the instrument should be checked and the calibration curve should be re-recorded. 3,4.2 Sampling and Analysis
. Start the gas turbine and bring it into the pre-specified power state. : During the start-up, shutdown and normal operation of the gas turbine, whenever no sampling is performed, clean and dry air should be introduced to blow back the sampling pipeline and sampling sensor to prevent the normal fuel from entering the sampling system and causing contamination.
b. After confirming that the gas turbine and sampling and analysis system have entered a stable working state, conduct sampling and analysis, and read the readings within the appropriate range of each analyzer.
c: If a single-point shift sampling sensor is used for sampling, the sampling point should be shifted and measured according to the predetermined sampling point position to determine the stable NOx, SO, and O2 concentrations at each point. The residence time at each point should be the average response time of the sampling system plus 3. d. During the test, the zero point and mark point of each instrument should be rechecked approximately every hour. If it is found that the required point drift and/or mark point drift exceeds 2%, the instrument should be checked and adjusted, and the test should be repeated after it is restored to the original technical state. 3.5 Test data
The following data should be recorded for each power state: GB 113T—≤$
Basic parameters such as gas turbine power (or parameters required for power calculation), speed, fuel flow rate, etc. b. Atmospheric conditions—pressure, temperature and humidity. c. Relevant data of fuel and additives (if used). d. Temperature and flow rate of sampling circuit.
e. Full scale range of NO, SO, and O, analyzer, calibration gas response value and sample gas response value. 1.6 Calculation and evaluation of test results
3.6.1 Calculate the concentration of NO and SO2 corrected to standard conditions—15% O2 concentration using the following formula. Corrected NO, or SO, concentration = (measured NO or SO2 concentration) × 5.9%/(20.9%-measured O2%). Note: When the concentration of O2 in the exhaust gas is greater than 16%, the change in the measured O2 concentration can correct the concentration of NO and SO2 pollutants by more than 10%. Therefore, the stability of the O2 analyzer and its careful calibration are very important. 3.6.Z When using a single-point shift sampling sensor, the reported NO and SO2 concentration values ​​should be the sum of the correction values ​​calculated at each sampling point divided by the number of sampling points. When using a multi-point mixed sampling sensor, the reported NO and SO2 concentration values ​​are the sum of the calculated correction values ​​obtained from several measurements of the sampling sensor divided by the number of times. Usually, one power state is sampled once. GB11370-8S
Appendix A
An alternative method for measuring gaseous pollutants (reference)
A1 adopts the Ministry of Aviation Industry standard HB6117-87 "Specification for continuous sampling and measurement procedures for gaseous pollutants in aviation gas turbine engines."
A1.1 If it is required to measure the gaseous pollutants in the exhaust, including carbon monoxide (CO) and unburned total hydrocarbons (THC) directly related to the incomplete combustion of fuel, the gaseous pollutants shall be measured according to the method specified in HB6117-87 of the Ministry of Aviation Industry. A1.2 If it is also required to know the sulfur emission of the gaseous pollutants specified in HB6117-87, one method can be calculated based on the sulfur content of the fuel in the book, and another method can refer to the relevant provisions of Article 3.2.7 of this standard to select SO2 analyzer, and then connect other analyzers in parallel to the sampling system to measure the SO2 concentration. Additional remarks:
This standard refers to the "Exhaust Pollution Control Standard for Ground-based Gas Turbines" (1977) of the US Environmental Protection Agency. This standard was proposed by the Sanyi Research Institute of the Ministry of Aviation Industry. This standard was drafted by the Beijing University of Aeronautics and Astronautics.
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