GB/T 8193-1987 Determination of total hydrocarbons in diesel engine exhaust gas - Hydrogen flame ionization method GB/T8193-1987 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of total bydrocarbons-Hydrogen flame ionization method
Diesel engine emissions---Determination of total bydrocarbons-Hydrogen flameionization method (HFID)
Scope of application
UDC 621. 436. 06
：543.06
GB8193-87
This standard specifies the use of heated hydrogen flame ionization method to continuously determine the concentration of total hydrocarbons in diesel engine exhaust under stable operating conditions. 2 Principle of determination
Carbon-containing organic compounds in exhaust gas are ionized into positive carbon ions and electrons under the high excitation of hydrogen flame. They form ion currents under the action of the electric field. The magnitude of the microcurrent is proportional to the carbon-hydrogen content in the gas sample calculated by the carbon number. The carbon-hydrogen concentration can be obtained by measuring the microcurrent intensity. 3 Terminology
3.1 The terminology related to diesel engines shall comply with the provisions of GB1883-80 "Terminology of Reciprocating Piston Internal Combustion Engines". 3.2 The terminology of diesel engine emissions shall comply with the provisions of GB8188-87 "Terminology of Diesel Engine Emissions". 4 Technical requirements for analysis system
4.1 The sampling system shall comply with the provisions of GB8190-87 "Technical Requirements for Diesel Engine Exhaust Analysis System". bzxz.net
4.2 In addition to complying with the provisions of GB8190, the analyzer shall meet the following requirements: 4.2.1 The analyzer is a pressure-stop type (see Figure 1). Span gas
Material gas at one end
Non-chamber
Addition zone
Figure 1 Typical flow chart of HC analyzer
V—flow control valve; P—pressure gauge, F—fader; R—pressure regulator: F—electrostatic meter; T—temperature sensor, V.—conversion valve: C—capillary, F1L—detector; FI—fluidizer Approved by the State Machinery Industry Commission on June 24, 1987 and implemented on July 1, 1988
GB 8193—87
A portion of the exhaust gas from the exhaust pipe flows through the heated sampling tube and filter to the sampling pump inlet. Downstream of the pump outlet, a portion of the exhaust gas sample enters the hydrogen flame ionization detector, and the excess gas sample is emptied. The entire gas sample delivery system from the sampling tube to the detector is equipped with a heating device and is kept at a constant temperature within the range of 190±10℃. 4.2.2 The analyzer should have appropriate grading, and its measurement concentration range is from a minimum of 0~~100ppm to a maximum of 0-~10000PPmC. 4.2.3 Stability
4.2.3.1 Zero drift,8 Within h, the instrument’s response to zero gas on the use range shall be within ±1% of the full scale. 4.2.3.2 Span shift, within 8 hours, the instrument’s response to span on the use range shall be within ±1% of the full scale. 4.2.4 Reproducibility, within ±1% of the full scale of the use range. 4.2.5 Linear error, within ±2% of the full scale of the use range. 4.2.6 Response time, within 6 seconds, the indication reaches 90% of the final response value (starting from the time the gas sample enters the analyzer inlet). Warm-up time, within 1.5 hours after power is turned on. 4.2.7
4.2.8 Instrument use conditions
4.2.8.1 In the environment temperature range of 5~35℃ and relative humidity within 30%~90%. 4.2.8.2 The change in ambient temperature is required to be within 10℃. The gas pressure is relatively stable. 4.2.8.3 The power supply voltage fluctuation is within 10%. 4.3 Recorder
4.3.1 Response time, the display reaches the full scale within 1. 4.3.2 The effective width of the recording paper is 250mm. 4.3.3 The paper feed speed variation range is at least 30-120mm/min, and it can be switched in multiple gears. 4.4 Gas
4.4.1 Zero gas, the zero gas used in this standard is zero-grade air, and the allowable limit values ​​of its impurity concentration are as follows: hydrocarbons 2PpmC, carbon dioxide 10Ppm, carbon dioxide 400Ppm and nitric oxide 1Ppm. 4.4.2 The combustion gas should contain 40%±2% hydrogen, and the rest should be ammonia or nitrogen. The concentration of hydrocarbons in the mixed gas should not exceed 2 ppm C.
4.4.3 The hydrocarbon content of the burner air should not exceed 2PPmC. The difference between the oxygen concentration and the oxygen concentration of the burner air used in the most recent oxygen interference check must be within 1%. 4.4.4 Calibration gas: The calibration gas used in this standard is prepared by diluting propane with zero-grade air. Its concentration should be close to 30%, 60%, and 90% of the range used.
4.4.5 Span gas: The span gas used in this standard is prepared by diluting propane with zero-grade air. Its concentration should be more than 70% of the full scale of the analyzer. The accuracy of the nominal concentration of the span gas should be within ±2%. 5 Preparation of the analysis system
5.1 Calibration of the analyzer
5.1.1 Connect the analyzer to the power supply, adjust the furnace temperature to 190±10℃, and preheat according to the requirements specified in the analyzer manual. 5.1.2 Adjust the burner fuel and air flow rate according to the specifications of the analyzer manual, ignite, and then adjust the gas sample flow rate according to the specifications. 5.1.3 Determine the optimal fuel flow rate, continuously introduce 350±75PpmC of internal alkane calibration gas into the analyzer, and change the fuel flow rate to determine the response peak. The selected working flow rate should be able to give the maximum response value, and when the flow rate changes slightly, the response value changes to a minimum. 5.2 Oxygen interference inspection, at least once a month. 5.2.1 Select the analyzer range so that the 350±75PPmC propane span gas is above 50% of the range, and pass the zero gas to adjust the label. 5.2.2 Use 350±75PpmC of propane span gas to calibrate the analyzer. 5.2.3 Introduce a mixed gas containing 350±75PpmC of internal alkane span gas with 5%O2/95%N and 10%Oz/90%N as background gas, respectively, and perform the measurement.
5.2.4 Calculate the oxygen interference 0.% of each calibration gas in 5.2.3 according to the following formula: 102 =
GB 8193-.87
CHC)=AR × 100%
Where: [HC>——actual concentration of span gas in 5.2.3, ppm C; AR5.2.3 response value of analyzer, PPm C. 5.2.5 The oxygen interference in the oxygen content range of 5% to 21% must be less than 3%. If the oxygen interference is greater than the specified requirements, the air, fuel gas or gas sample flow rate should be changed within the range specified in the analyzer manual, or even the fuel gas or detector should be replaced to meet the specified requirements. 5.3 Linear error check shall be carried out at least once a month. For each range used, check the linear error according to the following procedures. 5.3.1 When the fuel gas, air and gas sample flow rates are adjusted to meet the oxygen interference requirements, the analyzer is zeroed. 5.3.2 Use a calibration gas to calibrate the analyzer, and its response value should be able to reach about 90% of the full scale. 5.3.3 Record the calibration response of the basic concentration of 30%, 60%, and 90% of the range used, and draw a calibration curve. Check that the linear deviation of the span used should not be greater than ±2% of the full scale. If it exceeds this deviation value, readjust it. 6 Determination Procedure
6.1 The diesel engine test should be carried out in accordance with the procedures of GB6456-86 Diesel Engine Emission Test Method Part 1: Automobile and Engineering Machinery" or other relevant regulations.
6.2 Preparation of the instrument before measurement
6.2.1 Check the filter, connect the analyzer and the sampling system. 6.2.2 After the instrument is preheated, adjust the flow rate of fuel gas, air and gas sample according to 5.1.2 and 5.1.3. Introduce zero gas, adjust the zero point of the analyzer, and make it consistent with the zero point of the recorder. 6.2.3
Pass air and calibrate the instrument.
6.2.5 System contamination check - Pass zero air or clean dry air, and check the contamination of the pipeline and sampling probe according to daily working conditions. If it is greater than 20PpmC, clean or replace the sampling probe or pipeline. 6.3 Start the diesel engine for warm-up operation, so that the operating parameters such as water temperature, oil temperature and oil pressure reach the range specified by the manufacturer. 6.4 Adjust the diesel engine to the specified operating conditions and operate stably for at least 5 minutes. 6.5 Continuously sample and measure the exhaust gas of the diesel engine operating under stable conditions. 6.6 Start the tail check within 30 seconds after completing the last T. condition of the test. 6.6.1 At the lowest range used in the test, pass zero air or clean dry air to perform a zero tail check, and start measuring time at the same time. 6.6.2 If the difference between the response value of the calibration zero point and the tailing zero point is less than 5% of the full scale or 10ppmC within 4 minutes after the test, it is valid.
Introduce zero gas and span gas, and check the changes in the zero point and span indication of the analyzer during the test. The change in either the zero point or the span indication shall not exceed 2% of the full scale of the used range, otherwise the measurement result will be invalid and the test needs to be repeated. Additional Notes:
This standard is under the jurisdiction of Shanghai Internal Combustion Engine Research Institute. This standard was jointly funded and drafted by Shanghai Internal Combustion Engine Research Institute and Dajin Internal Combustion Engine Research Institute. The main drafters of this standard are Li Shaoxin, Li Shusong, He Yuan, and Zhang Lanyou. ..com
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