EPA Method 3B Gas Analysis for the Determination of Emission Rate Correction Factor or Excess Air
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ID： |
CE9E9838209C4B6AAA5700936E709F29 |
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文件大小(MB)： |
0.05 |
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页数： |
8 |
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文件格式： |
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日期： |
2011-10-6 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
Method 3B—Gas Analysis for the Determination of Emission Rate Correction Factor or Excess,Air,Note: This method does not include all of the specifications ( e.g., equipment and supplies) and procedures ( e.g.,sampling) essential to its performance. Some material is incorporated by reference from other methods in this part.,Therefore, to obtain reliable results, persons using this method should have a thorough knowledge of at least the,following additional test methods: Method 1 and 3.,1.0 Scope and Application,1.1 Analytes.,Analyte CAS No. Sensitivity,Oxygen (O2) 7782–44–72,000 ppmv,Carbon Dioxide (CO2) 124–38–92,000 ppmv,Carbon Monoxide (CO) 630–08–0 N/A.,1.2 Applicability. This method is applicable for the determination of O2, CO2, and CO,concentrations in the effluent from fossil-fuel combustion processes for use in excess air or,emission rate correction factor calculations. Where compounds other than CO2, O2, CO, and,nitrogen (N2) are present in concentrations sufficient to affect the results, the calculation,procedures presented in this method must be modified, subject to the approval of the,Administrator.,1.3 Other methods, as well as modifications to the procedure described herein, are also,applicable for all of the above determinations. Examples of specific methods and modifications,include: (1) A multi-point sampling method using an Orsat analyzer to analyze individual grab,samples obtained at each point, and (2) a method using CO2or O2and stoichiometric calculations,to determine excess air. These methods and modifications may be used, but are subject to the,approval of the Administrator.,1.4 Data Quality Objectives. Adherence to the requirements of this method will enhance the,quality of the data obtained from air pollutant sampling methods.,2.0 Summary of Method,2.1 A gas sample is extracted from a stack by one of the following methods: (1) Single-point,grab sampling; (2) single-point, integrated sampling; or (3) multi-point, integrated sampling. The,gas sample is analyzed for percent CO2, percent O2, and, if necessary, percent CO using an Orsat,combustion gas analyzer.,3.0 Definitions[Reserved],4.0 Interferences,4.1 Several compounds can interfere, to varying degrees, with the results of Orsat analyses.,Compounds that interfere with CO2 concentration measurement include acid gases ( e.g., sulfur,dioxide, hydrogen chloride); compounds that interfere with O2concentration measurement,include unsaturated hydrocarbons ( e.g., acetone, acetylene), nitrous oxide, and ammonia.,Ammonia reacts chemically with the O2absorbing solution, and when present in the effluent gas,stream must be removed before analysis.,5.0 Safety,5.1 Disclaimer. This method may involve hazardous materials, operations, and equipment. This,test method may not address all of the safety problems associated with its use. It is the,responsibility of the user of this test method to establish appropriate safety and health practices,and determine the applicability of regulatory limitations prior to performing this test method.,5.2 Corrosive Reagents. A typical Orsat analyzer requires four reagents: a gas-confining,solution, CO2absorbent, O2absorbent, and CO absorbent. These reagents may contain potassium,hydroxide, sodium hydroxide, cuprous chloride, cuprous sulfate, alkaline pyrogallic acid, and/or,chromous chloride. Follow manufacturer's operating instructions and observe all warning labels,for reagent use.,6.0 Equipment and Supplies,Note: As an alternative to the sampling apparatus and systems described herein, other sampling systems ( e.g., liquid,displacement) may be used, provided such systems are capable of obtaining a representative sample and maintaining,a constant sampling rate, and are, otherwise, capable of yielding acceptable results. Use of such systems is subject to,the approval of the Administrator.,6.1 Grab Sampling and Integrated Sampling. Same as in Sections 6.1 and 6.2, respectively for,Method 3.,6.2 Analysis. An Orsat analyzer only. For low CO2(less than 4.0 percent) or high O2(greater than,15.0 percent) concentrations, the measuring burette of the Orsat must have at least 0.1 percent,subdivisions. For Orsat maintenance and operation procedures, follow the instructions,recommended by the manufacturer, unless otherwise specified herein.,7.0 Reagents and Standards,7.1 Reagents. Same as in Method 3, Section 7.1.,7.2 Standards. Same as in Method 3, Section 7.2.,8.0 Sample Collection, Preservation, Storage, and Transport,Note: Each of the three procedures below shall be used only when specified in an applicable subpart of the,standards. The use of these procedures for other purposes must ha……
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