HJ 1131-2020 English PDFUS$259.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. HJ 1131-2020: Stationary source emission - Determination of sulphur dioxide - Portable ultraviolet absorption method Status: Valid
Basic dataStandard ID: HJ 1131-2020 (HJ1131-2020)Description (Translated English): Stationary source emission - Determination of sulphur dioxide - Portable ultraviolet absorption method Sector / Industry: Environmental Protection Industry Standard Classification of Chinese Standard: Z25 Word Count Estimation: 11,198 Date of Issue: 2020-05-15 Date of Implementation: 2020-08-15 Regulation (derived from): Ministry of Ecology and Environment Announcement No. 29, 2020 Issuing agency(ies): Ministry of Ecology and Environment HJ 1131-2020: Stationary source emission - Determination of sulphur dioxide - Portable ultraviolet absorption method---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Stationary source emission - Determination of sulphur dioxide - Portable ultraviolet absorption method National Environmental Protection Standards of the People's Republic of China Determination of Sulfur Dioxide in Waste Gas from Stationary Pollution Sources Portable UV Absorption Method 2020-05-15 release 2020-08-15 Implementation Issued by the Ministry of Ecology and Environment Table of contentsForeword...ii 1 Scope of application...1 2 Normative references...1 3 Terms and definitions...1 4 Principle of the method...2 5 Interference and cancellation...2 6 Reagents and materials...2 7 Instruments and equipment...2 8 Sample...3 9 Analysis steps...3 10 Calculation and presentation of results...4 11 Precision and accuracy...5 12 Quality Assurance and Quality Control...5 13 Precautions...5 Appendix A (informative appendix) instrument performance audit results before and after monitoring...7ForewordTo implement the Environmental Protection Law of the People’s Republic of China and the Air Pollution Prevention and Control Law of the People’s Republic of This standard is formulated to ensure the environment, protect human health, standardize the portable determination method of sulfur dioxide in exhaust gas from fixed pollution sources. This standard specifies a portable ultraviolet absorption method for the determination of sulfur dioxide in exhaust gas from stationary sources. Appendix A of this standard is an informative appendix. This standard is issued for the first time. This standard was formulated by the Department of Ecological Environment Monitoring and the Department of Regulations and Standards of the Ministry of Ecology and Environment. Drafting organizations of this standard. China Environmental Monitoring Center, Shandong Ecological Environment Monitoring Center. Verification units of this standard. Tianjin Ecological Environment Monitoring Center, Hubei Province Ecological Environment Monitoring Center Station, Qinhuangdao City Environmental Environmental Monitoring Center, Shenyang Ecological Environmental Monitoring Center of Liaoning Province, Binzhou Ecological Environmental Monitoring Center of Shandong Province, and Guiyang Environmental Monitoring Center Station. This standard was approved by the Ministry of Ecology and Environment on May 15, 2020. This standard will be implemented on August 15, 2020. This standard is interpreted by the Ministry of Ecology and Environment. 1 Determination of sulfur dioxide in exhaust gas from stationary sources. Portable ultraviolet absorption method1 Scope of applicationThis standard specifies a portable ultraviolet absorption method for the determination of sulfur dioxide in exhaust gas from stationary sources. This standard applies to the determination of sulfur dioxide in waste gas from stationary sources. The detection limit of the method is 2 mg/m3, and the lower limit of determination is 8 mg/m3.2 Normative referencesThis standard quotes the following documents or their clauses. For undated reference documents, their valid versions are applicable to this standard. GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method for gaseous pollutants HJ 75 Technical specification for continuous monitoring of emission of stationary pollution source flue gas (SO2, NOX, particulate matter) HJ/T 373 Fixed pollution source monitoring quality assurance and quality control technical specifications HJ/T 397 Fixed source exhaust gas monitoring technical specification HJ 1045 Fixed pollution source flue gas (sulfur dioxide and nitrogen oxide) portable ultraviolet absorption method technical requirements Seeking and testing methods3 Terms and definitionsThe following terms and definitions apply to this standard. 3.1 Calibration span The concentration value of the standard gas used for calibration (when performing multi-point calibration, it is the highest concentration value of the standard gas used for calibration), The calibration range (indicated by CS below) should be less than or equal to the full range of the instrument. 3.2 Error of indication The absolute or relative error between the measurement result of the standard gas directly imported into the analyzer and the concentration value of the standard gas. 3.3 Zero drift Before and after the measurement, the absolute error of the measurement result of the same zero gas by the instrument or the percentage of the absolute error to the calibration range. 3.4 Span drift Before and after the measurement, the absolute error or absolute error of the measurement result of the instrument on the same calibration range point standard gas is compared with the calibration Percentage of range. 3.5 Systematic error 2 The standard gas is directly imported into the air inlet of the instrument host (direct measurement mode). The absolute error or the percentage of the absolute error between the measurement results obtained by importing the instrument (system measurement mode) into the instrument (system measurement mode) and the calibration range.4 Principle of the methodSulfur dioxide has a selective absorption to the characteristic wavelength of 190 nm～230 nm or 280 nm～320 nm in the ultraviolet region. In accordance with the Lambert-Beer law, the concentration of sulfur dioxide in the exhaust gas is quantitatively determined.5 Interference and elimination5.1 The particulate matter in the exhaust gas is easy to pollute the absorption pool. The particulate matter in the exhaust gas should be eliminated or reduced by means of high-efficiency filter dust removal. For the contamination of the instrument by particles, the material of the filter material should avoid physical adsorption or chemical reaction with sulfur dioxide. 5.2 The water vapor in the exhaust gas will absorb the sulfur dioxide in the sample when it is cold and produce condensed water during the sampling process, resulting in test results. If the result is too low, it should be eliminated by heating sampling pipes and air ducts, cooling devices for rapid dehumidification or measuring hot and humid exhaust gas samples, etc. Or reduce the pollution of the instrument caused by the condensation of water vapor in the exhaust gas and the loss of sulfur dioxide adsorption and dissolution.6 Reagents and materials6.1 Sulfur dioxide standard gas. a commercially available certified standard gas with an expanded uncertainty ≤ 2%; or use the gas distribution device in 6.2 A suitable concentration gas obtained by diluting a high concentration of commercially available certified standard gas with nitrogen. 6.2 Gas distribution device. a commercially available dilution gas distribution device, the maximum output flow is not less than 5 L/min, all input and output flow The maximum allowable error of the meter flow should meet. when the flow is less than 50% of the full range, the maximum allowable error of the flow does not exceed the full range When the flow is not less than 50% of the full scale, the maximum allowable error of the flow does not exceed ±1.0% of the set flow. The material of the gas circuit system of the gas distribution device should avoid physical adsorption or chemical reaction with sulfur dioxide. 6.3 Zero gas. nitrogen or air with purity ≥99.99% that does not interfere with the measurement.7 Apparatus and equipment7.1 Ultraviolet absorption method sulfur dioxide analyzer 7.1.1 Composition Ultraviolet absorption method sulfur dioxide analyzer (abbreviation. instrument) composition. analyzer (including light source, detector, absorption cell, Control unit, etc.), gas flow meter, air pump, sampling pipe, air duct, dehumidification and dust removal device, printer, etc. The instrument for measuring exhaust gas samples using the thermal and humidity method should be equipped with a detector for measuring the moisture content in the exhaust gas, and no dehumidification device is required. However, the moisture content in the exhaust gas should be measured simultaneously. Note. Thermal moisture method refers to the method of directly measuring the concentration of high-temperature wet exhaust gas without condensation and removal of water. 7.1.2 Performance requirements a) Indication error. when the calibration range ＞100 μmol/mol, the relative error does not exceed ±3%; the calibration range ≤ At 3100 μmol/mol, the absolute error does not exceed ±3.0 μmol/mol; b) System error. when the calibration range >60 μmol/mol, the relative error does not exceed ±5%; the calibration range≤ When 60 μmol/mol, the absolute error does not exceed ±3.0 μmol/mol; c) Zero drift. when the calibration range >100 μmol/mol, the relative error does not exceed ±3%; the calibration range≤ When 100 μmol/mol, the absolute error does not exceed ±3.0 μmol/mol; d) Range drift. when the calibration range >100 μmol/mol, the relative error does not exceed ±3%; the calibration range≤ When 100 μmol/mol, the absolute error does not exceed ±3.0 μmol/mol; e) With sampling flow display function; f) Sampling tube heating and heat preservation temperature. can be set and adjusted within 120℃～160℃; g) Other properties should meet the requirements of HJ 1045. 7.2 Standard gas cylinder. equipped with adjustable pressure reducing valve, flow controller and air pipe. Pressure reducing valve, flow controller and air guide The pipe material should avoid physical adsorption or chemical reaction with sulfur dioxide. 7.3 Air collecting bag. used to calibrate the instrument by air bag method. The lining material should be polyfluoroethylene film, aluminum-plastic composite film, etc. Inert material for testing composition.8 samplesAccording to GB/T 16157, HJ/T 397, HJ/T 373, HJ 75 and relevant regulations, determine the sampling location, sampling point and frequency Second, collect sulfur dioxide samples for analysis.9 Analysis steps9.1 Air tightness check of the instrument According to the instrument manual, connect the analyzer, sampling tube, air duct, etc., turn on the power of the instrument, and stabilize after the instrument is warmed up After that, check the air tightness according to HJ 1045.If the check fails, check for leaks and maintain until the check is qualified. 9.2 Instrument calibration Import the zero point gas and the sulfur dioxide standard gas into the instrument in turn, and calibrate the instrument zero point and calibration range according to the instrument manual. The method of introducing zero gas and standard gas is as follows. a) Air bag method. fill the clean air bag with standard gas and empty it, repeat three times, and use it within 6 hours after refilling use. The concentration of the standard gas introduced should not exceed 100 μmol/mol. According to the calibration specified in the instrument manual Calibrate according to the exact steps. If this measurement needs to determine the zero point drift and span drift, record the zero point and calibrate the span Point the instrument to indicate the number. b) Cylinder method. connect a standard gas cylinder equipped with a flow controller and a gas pipe to the sampling pipe, and open the cylinder gas valve Door, adjust the flow controller to pass the standard gas into the inlet of the instrument at the flow rate specified by the instrument. Pay attention to each No air leaks at the connection. For the built-in suction pump of the analyzer, the cylinder gas supply flow should be appropriately increased, and the The bypass pressure relief method ensures that there is no negative pressure in the gas path and that the air intake of the analyzer will not be too large. According to the instrument manual Perform calibration according to the calibration procedure specified in. If this measurement needs to determine the zero point drift, span drift, record the zero point, Calibrate the range point of the instrument display. 49.3 Sample determination Insert the sampling tube into the sampling point, and continuously and automatically sample at the sampling flow rate specified by the instrument, and wait for the instrument reading to stabilize. Record readings, save an average value every minute, and continuously sample for 5 min～15 min. The average value of measured data can be used as a sample Product measured value. 9.4 Quality check and shutdown After the determination, proceed as follows. a) Place the sampling tube in the zero point gas and wait for the instrument display to stabilize; b) If you need to perform a zero drift check, record the value of the instrument at this time, and calculate the zero drift, otherwise go directly to the next One step (the monitoring unit arranges according to the requirements of 12.3 of this standard to regularly carry out zero-point drift inspection); c) Pass the standard gas through the inlet of the instrument and the sampling pipe respectively, and calculate the indication error and the system after the instrument display is stable. System error; or directly pass standard gas through the sampling pipe to check the indication error of the whole system; d) If the range drift check is needed, pass a standard gas whose concentration is the calibration range from the sampling tube, and wait for the indicator to stabilize Record the displayed value of the instrument, calculate the range drift, otherwise go directly to the next step (the monitoring unit is based on 12.3 Request to arrange to carry out range drift inspection regularly); e) If the results of b), c), and d) meet the requirements of 7.1.2, the test result is valid, otherwise the test result is invalid; f) Place the sampling tube in the zero point gas, and after the instrument display is stable, turn off the power of the instrument and the preprocessor, and disconnect the instrument All parts are connected, the instrument is packed and the test is over. 10 Calculation and presentation of results 10.1 Result calculation Calculate the mass concentration of sulfur dioxide in the exhaust gas under the standard state (273 K, 101.325 kPa) as follows. a) If the dry basis concentration is obtained by the test, the volume fraction is converted to the mass concentration under the standard state, and it is calculated according to formula (1). 510.2 Results presentation The calculation result of the concentration of sulfur dioxide is reserved to the integer. When the concentration is ≥1.00×103mg/m3, three significant figures are reserved. 11 Precision and accuracy 11.1 Precision The six laboratories carried out analysis of sulfur dioxide standard gases with concentrations of 28 mg/m3, 148 mg/m3, and 289 mg/m3. 6 repeated determinations. the relative standard deviations in the laboratory were 0.5%～3.1%, 0.1%～1.0% and 0.3%～0.8%; The relative standard deviations between laboratories are 3.3%, 1.2% and 1.7% respectively; the repeatability limits are 1 mg/m3, 1 mg/m3 and 2 mg/m3; The reproducibility limits are 3 mg/m3, 5 mg/m3 and 13 mg/m3. Six laboratories simultaneously measured the sulfur dioxide concentration in the flue gas of a sintering machine and power plant. The concentration of sulfur dioxide in the medium is 74 mg/m3～86 mg/m3, with an average value of 77 mg/m3; the concentration of sulfur dioxide in the flue gas of the power plant is 4 mg/m3～23 mg/m3, the average value is 15 mg/m3.The relative standard deviations in the laboratory are 6.5%～8.5% and 7.7%～45.0%; the relative standard deviations between laboratories are 5.9% and 46.3% respectively; the repeatability limits are 2mg/m3 and 7 mg/m3; The reproducibility limits are 13 mg/m3 and 21 mg/m3. 11.2 Accuracy The six laboratories carried out analysis of sulfur dioxide standard gases with concentrations of 28 mg/m3, 148 mg/m3, and 289 mg/m3. Determination. The relative errors are -6.2%～1.0%, -1.9%～0.4%, -3.4%～0.3%; the final value of the relative error is -1.6%±6.5%, -0.5%±2.4%, -1.3%±3.3%. 12 Quality Assurance and Quality Control 12.1 After the sample is measured, measure the zero gas and sulfur dioxide standard gas in accordance with 9.4, calculate the measured indication error, and check the instrument The system error of the device should meet the requirements of 7.1.2 a) and b). It can also include sampling pipe, air duct, dehumidification For the inspection of the indication error of the whole system such as the device, the evaluation shall be carried out according to the requirements of 7.1.2 a). 12.2 The measurement result of the sample should be between 20% and 100% of the calibration range of the instrument, otherwise the calibration range should be reselected; If the measurement result is less than the lower limit of the measurement, it is not restricted by this article. 12.3 During the use of the instrument, check the zero drift and span drift at least once a month. If the instrument has not been used for a long time (exceeding After 1 month), a zero drift and span drift check should be performed the next time it is used. Check result should match Meet the requirements of 7.1.2 c) and d). 12.4 When the test result does not meet the requirements of any one of 12.1, 12.2, and 12.3, the test result is invalid and should be reselected Select the calibration range, maintain and repair the instrument and retest. 13 matters needing attention 13.1 The instrument should work under its specified ambient temperature, ambient humidity and other conditions. 613.2 Before the measurement, ensure that the sampling pipe and air duct are unblocked, clean the particulate filter device, and replace the filter material if necessary. 13.3 Before the measurement, check whether the heating system of the sampling tube is working normally, whether the sampling tube is heated to the preset temperature, the instrument must Preheat fully. 13.4 If there is a dehumidification and cooling device, it should ensure normal operation before the measurement. The condensate should be observed during the whole measurement process and drained in time. To prevent affecting the measurement results. 13.5 When the negative pressure at the monitoring point is too large, it will easily cause the instrument to fail to collect smoke normally, which will affect the accuracy of the test results. should Choose an instrument with a negative pressure resistance greater than that of the flue or lead the negative pressure flue gas to the balance device to eliminate the impact. The measurement is then performed. Monitor at any time during the measurement process. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of HJ 1131-2020_English be delivered?Answer: Upon your order, we will start to translate HJ 1131-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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