英文版HJ T 57-2000　固定污染源排气中二氧化硫的测定定电位电解法

英文版HJ T 57-2000　固定污染源排气中二氧化硫的测定定电位电解法 HJ Standard of the State Environmental Protection Administration of China 国家环境保护总局 标准 excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载 HJ/T 57-2000 Determination of Sulphur Dioxide from Exhausted Gas of Stationary Source Fixed-potential Electrolysis Method 固定污染源排气中二氧化硫的测定 定电位电解法 Issued on Dec. 07, 2000 Implemented on Mar. 01, 2001 Issued by the State Environmental Protection Administration of China Contents Foreword................................................................................................................................ I 1 Scope ................................................................................................................................. 1 2 Normative References ........................................................................................................ 1 3 Principles ........................................................................................................................... 1 4 Instruments ........................................................................................................................ 1 5 Reagent .............................................................................................................................. 2 5.1 Sulfur Dioxide Standard Gas. .................................................................................. 2 6 Procedures.......................................................................................................................... 2 6.1 Starting Up and Labeling Zero ................................................................................ 2 6.2 Determination ......................................................................................................... 2 6.3 Shutdown ................................................................................................................ 2 6.4 Instrument Labeling and Electrochemical Sensor Changing ..................................... 2 6.5 Rechargeable Battery in Instrument ......................................................................... 2 7 Calculation of Sulfur Dioxide Drainage Rate ...................................................................... 2 7.1 Determination and Calculation of Exhaust Discharge .............................................. 3 7.2 Calculation of Sulfur Dioxide Drainage Rate ........................................................... 3 Foreword This standard establishes the measuring method for the determination of sulfur dioxide concentration and total discharge from exhausted gas of stationary source with fixed-potential electrolysis method. This standard was formulated by referring to the national standard GB/T 16157-16157 "The determination of Particulates and Sampling Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source" and the partial contents of the "Monitoring and Analytical Method for Ambient Air and Exhaust Gas" printed by the State Environmental Protection Administration of China in 1990 as well as the relevant domestic and foreign technical specifications and enterprise standards. This standard was proposed by the Department of Science, Technology and Standards, the State Environmental Protection Administration of China. This standard was drafted by the China National Environmental Monitoring Center. This standard was explained by the State Environmental Protection Administration of China. I Standard of the State Environmental Protection Administration of China 国家环境保护总局标准 Determination of Sulphur Dioxide from Exhausted Gas of Stationary Source Fixed-potential Electrolysis Method 固定污染源排气中二氧化硫的测定 定电位电解法 HJ/T 57-2000 1 Scope This standard specifies the measuring methods for the determination of sulfur dioxide concentration and total discharge from exhausted gas of stationary source with fixed-potential electrolysis method. 2 Normative References The following standard containing provisions which, through reference in this text, constitute provisions of this standard shall be equivalent to this standard. GB/T 16157-1996 "The determination of Particulates and Sampling Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source" 3 Principles In flue gas, the sulfur dioxide (SO) diffuses, enters into electrolyzer through sensor 2 permeable membrane and generates oxidation reaction on fixed-potential working electrode: ,2， SO，2HO,SO，4H，2e224 Then the limit diffusion current i generates, and the current size is directly proportional to the sulfur dioxide concentration, namely: ZFSD i,,c, Under specified working conditions, the electron transfer number Z, Faraday constant F, diffusion area S, diffusion coefficient D and diffusion layer thickness S are constants, so the sulfur dioxide concentration C may be determined by the limit current i. 33Determination range: 15mg/m~14300mg/m. Measurement error: ?5%. Influencing factors: hydrogen fluoride and hydrogen sulfide interfere with the determination of sulfur dioxide. The fume block may influence the flow velocity of gas recovery, and the flow velocity change of gas recovery directly influences the test reading of instruments. 4 Instruments 4.1 Sulfur Dioxide Determinator of Fixed- potential Electrolytic Process 4.2 Sulfur Dioxide Sampling Tube with Heating and Desiccation Devices. 4.3 Sulfur Dioxide Standard Gas Series with Different Concentration or Sulfur Dioxide Gas Distributing System. 4.4 Tester for Determining Pipe Gas Parameter. 1 5 Reagent 5.1 Sulfur Dioxide Standard Gas. 6 Procedures Different determinators are with different operation procedures and shall be operated strictly according to the instrument instruction. 6.1 Starting Up and Labeling Zero Connect instrument with sampling tube and corresponding accessories. Count down for the fixed-potential electrolysis sulfur dioxide determinator after starting up, and label zero for the instrument. The instrument automatically enters into the determination state after the labeling completion. 6.2 Determination The sampling shall be carried out under rated load or referring to relevant standards or specifications. Insert instrument sampling tube into flue pipe, start instrument suction pump, and extract flue gas to take the determination. Read after the instrument reading stability. Continuously determine thrice under the same operating condition and adopt mean value as the measurement result. During the measuring process, supervise the flow velocity change of gas recovery at any time, clean and change fume filtering device in time. 6.3 Shutdown After the determination completion, place the sampling tube in ambient atmosphere; keep on pumping and sweeping the instrument sensor according to the requirements of instrument instruction till the indicating value of instrument sulfur dioxide concentration meet the requirements of instrument instruction, then automatically or manually shut down. 6.4 Instrument Labeling and Electrochemical Sensor Changing 6.4.1 Instrument calibration The sensitivity of fixed-potential electrolytic process electrochemical sensor depends on time, and the instrument shall be calibrated one time every three months to six months. The organization without calibration facility may label in national authorized organization; the organization with calibration facility may use the calibrating procedure specified in instrument instruction of sulfur dioxide distribution device or sulfur dioxide standard gas series with different concentration, label maximum and zero, then retest with sulfur dioxide standard gas of near midpoint concentration in instrument range; if the reading deviation of instrument is no higher than ?5%, the labeling shall be qualified. 6.4.2 Electrochemical sensor changing During the electrochemical sensor labeling, if the dynamic range is smaller, the upper limit of measurement can not reach the full-scale value, or the reading deviation is higher than?5% at the midpoint of retest instrument range, it indicates the sensor is invalid, and the electrochemical sensor shall be changed. 6.5 Rechargeable Battery in Instrument Most fixed-potential electrolytic process sulfur dioxide testers are equipped with rechargeable batteries. This battery is not only easy to site operation, but also used to maintain the polarization condition of electrochemical sensor after the instrument shutdown. The rechargeable battery shall be assured to have enough electric power at any time. Most instruments can automatically display the dump energy of rechargeable battery after starting up, so the battery shall be charged in time according to the requirements of instrument instruction. 7 Calculation of Sulfur Dioxide Drainage Rate 2 7.1 Determination and Calculation of Exhaust Discharge The exhaust flow velocity shall be measured according to those specified in Articles 37.1~7.5 of GB/T 16157-1996 and the dry exhaust discharge Q(m/h) under normal condition sn shall be calculated according to those specified in Article 7.6. 7.2 Calculation of Sulfur Dioxide Drainage Rate 7.2.1 When indicating sulfur dioxide concentration with ppm (V/V), the concentration c may be changed into the concentration of dry flue gas sulfur dioxide under normal condition according to the following formula: 643 (mg/m) c',，c22.43Where: c′——Dry flue gas sulfur dioxide concentration under normal condition (mg/m) 7.2.2 Calculation of sulfur dioxide drainage rate ,6 (kg/h) G,c'，Q，10sn Where: G——the drainage rate of sulfur oxide (kg/h); 3c′——the sulfur dioxide concentration of dry exhaust (mg/m); 3Q——the dry exhaust discharge under normal condition (dm/h) sn 3