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HJ 1045-2019 English PDF

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HJ 1045-2019: Specifications and test procedures for portable monitoring instrument for SO2 and NOX based on ultraviolet absorption method in flue gas emitted from stationary sources
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Basic data

Standard ID HJ 1045-2019 (HJ1045-2019)
Description (Translated English) Specifications and test procedures for portable monitoring instrument for SO2 and NOX based on ultraviolet absorption method in flue gas emitted from stationary sources
Sector / Industry Environmental Protection Industry Standard
Classification of Chinese Standard Z25
Classification of International Standard 13.040.40
Word Count Estimation 33,310
Date of Issue 2019
Date of Implementation 2020-04-24
Issuing agency(ies) Ministry of Ecology and Environment

HJ 1045-2019: Specifications and test procedures for portable monitoring instrument for SO2 and NOX based on ultraviolet absorption method in flue gas emitted from stationary sources


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(Technical requirements and testing methods of portable ultraviolet absorption measuring instruments for stationary pollution source flue gas (sulfur dioxide and nitrogen oxides)) National Environmental Protection Standard of the People's Republic of China Technical requirements and testing methods of portable ultraviolet absorption measuring instruments for stationary pollution source flue gas (sulfur dioxide and nitrogen oxides) Specifications and test procedures for portable monitoring instrument for SO2 and NOX based on ultraviolet absorption method in flue gas emitted from stationary sources 2019-10-24 released 2020-04-24 Implementation Ministry of Ecology and Environment

Contents

Foreword

1 Scope ... 1 2 Normative references ... 1 3 Terms and definitions ... 1 4 Instrument composition and structure ... 2 5 Technical requirements ... 3 6 Performance indicators ... 5 7 Detection methods ... 7 8 Quality Assurance ... 15 9 Test items ... 16 Appendix A (Normative Appendix) Instrument Data Collection Record and Processing Requirements ... 18 Appendix B (Informative) Technical requirements for sample gas pipelines and dehumidification equipment ... 21 Appendix C (informative appendix) On-site inspection method of instrument air tightness ... 22 Appendix D (Informative) Original Record Form for Instrument Laboratory Testing and Field Testing ... 23

Foreword

In order to implement the "Environmental Protection Law of the People's Republic of China" and the "Law Monitoring of pollutants emitted from stationary gas pollution sources, standardizing the performance of portable sulfur dioxide and nitrogen oxide ultraviolet absorption measuring instruments, Quality and testing to develop this standard. This standard specifies the composition of portable measuring instruments for sulfur dioxide and nitrogen oxides in a fixed source of pollution. Structure, technical requirements, performance indicators, and instrument testing and evaluation methods. Appendix A to this standard is a normative appendix, and appendixes B to D are informative appendixes. This standard is issued for the first time. This standard is formulated by the Department of Eco-Environmental Monitoring, Laws and Standards Department of the Ministry of Ecology and Environment. This standard was drafted. China National Environmental Monitoring Station, Shandong Provincial Ecological Environment Monitoring Center. This standard was approved by the Ministry of Ecology and Environment on October 24,.2019. This standard will be implemented as of April 24, 2020. This standard is explained by the Ministry of Ecology and Environment. Determination of Flue Gas (Sulfur Dioxide and Nitrogen Oxide) from Stationary Pollution Sources by Portable UV Absorptiometry Measuring instrument technical requirements and detection methods

1 Scope

This standard specifies portable instruments for measuring sulfur dioxide and nitrogen oxides in a fixed source of pollution. (Referred to as instrument) composition structure, technical requirements, performance indicators and instrument detection and evaluation methods. This standard is applicable to the design and production of portable fixed pollution sources for measuring sulfur dioxide, nitrogen oxides and oxygen. And performance testing. Technical requirements for portable monitoring instruments that absorb other gases in the near-ultraviolet region can be implemented with reference to this standard.

2 Normative references

The content of this standard refers to the clauses in the following documents. For undated references, the valid version is applicable to this standard. GB/T 4208 enclosure protection grade (IP code) GB/T 16157 Determination of particulate matter and sampling of gaseous pollutants in exhaust from stationary pollution sources HJ 75 Technical Specifications for Continuous Monitoring of Flue Gas (SO2, NOX, Particulate Matter) Emissions from Stationary Pollution Sources HJ 76 Technical requirements and detection methods of continuous monitoring system for the emission of flue gas (SO2, NOX, particulate matter) from stationary pollution sources HJ/T 397 Fixed source exhaust gas monitoring technical specifications

3 terms and definitions

The following terms and definitions apply to this standard. 3.1 Full scale span The maximum measurement value set by the instrument according to the actual application needs. 3.2 Response time Instrument response time is divided into rising response time and falling response time. Rise response time refers to the passage of the span calibration gas after the zero reading of the instrument stabilizes. Intervals between the moment when the span calibration gas is 90% of its nominal value. Falling response time refers to the introduction of zero gas after the reading of the measuring range point of the instrument is stable. The interval between the time when the calibration value of the calibration gas is 10% and the middle time interval. 3.3 Zero drift Under the premise that the instrument has not been repaired, maintained or adjusted, the instrument is operated for a specified period of time after passing zero gas. The percentage of the deviation between the meter reading and the initial measurement of the zero gas relative to the full scale. 3.4 Span drift Under the premise that the instrument has not been repaired, maintained or adjusted, the instrument is operated for a specified period of time and a span calibration gas is passed in. Percentage of deviation between the instrument's reading and the initial measurement of the span calibration gas relative to full scale. 3.5 Parallelism Relative standard deviation of the measurement results when the same model and configuration of the same object are measured under the same environmental conditions. 3.6 Reference method Standard method published by the country or industry for comparison with instrument measurements. 3.7 Dry flue gas concentration After the flue gas is pretreated, the concentration of each pollutant in the flue gas when the dew point temperature is ≤4 ° C is also called the dry basis concentration. 3.8 Standard state The state at a temperature of 273.15 K and a pressure of 101.325 kPa. The mass concentration of pollutants in this standard are all standards The dry flue gas concentration in the state. 3.9 Relative accuracy The reference method measures the concentration of gaseous pollutants (containing oxygen) in the flue gas synchronously with the instrument to be measured. The measurement results of the state constitute several data pairs, and the absolute value of the average of the difference between the data pairs and the absolute value of the confidence coefficient, Ratio to the average of the data measured by the reference method.

4 Composition and structure of the instrument

4.1 Instrument composition The instrument consists of gaseous pollutants SO2 and/or NOX monitoring unit, monitoring parameters of flue gas parameters (oxygen content, etc.) and data Acquisition and processing unit (see Figure 1). When the instrument measurement result is a wet-based concentration, a flue gas humidity monitoring unit should be configured. 4.2 Instrument structure The instrument structure mainly includes a sample acquisition and delivery unit, a sample pretreatment unit, an analysis unit, and data acquisition and processing Unit, etc. Depending on the instrument used to extract cold and dry, extract hot and humid and direct measurement, the instrument consists of all or part of the above Sub-structure composition (see Figure 1). 4.2.1 Sample collection and transfer unit The sample collection and transfer unit mainly includes sampling equipment (sampling tube), sample transfer pipeline, flow control equipment and For the specific technical requirements of sample pumps, etc., see 5.4.1. 4.2.2 Sample pretreatment unit The sample pretreatment unit mainly includes pretreatment equipment such as sample dehumidification equipment. For specific technical requirements, see 5.4.2. 4.2.3 Analysis Unit The analysis unit is used to measure and analyze the collected pollution source flue gas samples. Mainly include gas circuit, circuit, electrical components, Optical components, measuring cells and detectors. 4.2.4 Data acquisition and processing unit The data acquisition and processing unit is used to collect, store, calculate, and process measurement data and status information of instruments and equipment. See 5.4.5 for technical requirements. Figure 1 Schematic diagram of the composition of portable sulfur dioxide and nitrogen oxide ultraviolet absorption measuring instruments

5 Technical requirements

5.1 appearance requirements 5.1.1 The instrument shall have a product nameplate, which shall be marked with the instrument name, model, production unit, factory number, manufacturing Date and other information. 5.1.2 The surface of the instrument should be intact, without obvious defects, the components and units should be connected reliably, and the operation keys and buttons should be used smoothly. Live and accurate positioning. 5.1.3 The display of the main panel of the instrument is clear, the color is solid, the characters and signs are easy to identify, and there should be no defects that affect the reading. 5.1.4 The instrument case or cover should be corrosion resistant and have good sealing performance. It should meet the requirements of IP55 protection level in GB/T 4208. 5.1.5 The instrument should have good portability and mobility. The total mass of the instrument (including the pretreatment unit) should not exceed 30 kg. Data acquisition and processing unit 5.2 Working conditions The instrument should work normally under the following conditions. 1) Ambient temperature (0 ～ 40) ℃ (applicable ambient temperature of oxygen electrochemical sensor (5 ～ 40) ℃); 2) Relative humidity. ≤85%; 3) Atmospheric pressure. (80 ～ 106) kPa; 4) Power supply voltage. AC (220 ± 22) V, (50 ± 1) Hz. Note. Under special environmental conditions such as low temperature and low pressure, the configuration of instruments and equipment should meet the requirements of local environmental conditions. 5.3 Safety requirements 5.3.1 Insulation resistance When the ambient temperature is (0 ~ 40) ° C and the relative humidity is ≤85%, the insulation of the power terminal of the instrument to the ground or the case is The resistance is not less than 20 MΩ. 5.3.2 Insulation strength When the ambient temperature is (0 ～ 40) ℃ and the relative humidity is ≤85%, the instrument is operated at 1500 V (effective value), 50 Hz The sine wave test voltage lasts for 1 min, and there should be no breakdown or flashover. 5.3.3 The instrument should have a leakage protection device and good grounding measures to prevent damage to the instrument from lightning strikes and static electricity. 5.4 Functional requirements 5.4.1 Requirements for sample collection and transfer units 5.4.1.1 The material of the sampling tube shall be selected from materials that are resistant to high temperature, corrosion and do not react with gaseous pollutants, and shall not affect Normal measurement of the pollutant to be tested. 5.4.1.2 The sampling tube shall have heating and heat insulation functions. The heating temperature is generally above 120 ℃, the temperature is adjustable, and it should be high When the flue gas dew point temperature is above 10 ℃, its actual temperature value should be able to be displayed on the instrument or in the software. For the detection method, see 7.1.4.2. 5.4.1.3 The sampling tube shall have a filtering function for particulate matter. The front or back of the sampling tube should have particles that can be easily replaced or cleaned Filter, the material of the filter material should not react with gaseous pollutants, and the filter should be able to filter at least (5-10) μm Particles above the particle size. 5.4.1.4 The sampling tube shall have sufficient length to reach the point where the sampling section of the chimney or chimney meets the measurement requirements, and the length is generally Not shorter than 1.5 m. 5.4.1.5 The instrument adopting the extraction measurement method, the sample conveying pipeline (before the dehumidification equipment using the cold-dry method or Instrument) should generally have stable and uniform heating and insulation functions. The heating temperature is generally above 120 ℃, and the temperature is adjustable. It should be more than 10 ℃ higher than the flue gas dew point temperature, and its actual temperature value should be able to be displayed on the instrument or in the software; See 7.1.4.2. The sample transfer pipeline should use materials that do not react with gaseous pollutants and should not affect the It is usually measured, and the length is generally not shorter than 1.5 m; its technical indicators shall meet the technical requirements of Table B.1 in Appendix B. 5.4.1.6 The flow control equipment shall ensure that the sampling flow is uniform and stable, and the fluctuation of the sampling flow shall be maintained at the set sampling flow. Within ± 10%. 5.4.1.7 The sampling pump shall have sufficient suction capacity to overcome the negative pressure of the flue or chimney and the resistance of the sampling equipment. When sampling is set When the standby load resistance is 10 kPa, the change of the measurement result of the gaseous pollutants caused by the change in the sampling flow of the suction does not exceed ± 5% For the detection method, see 7.1.4.12. 5.4.2 Requirements for sample pretreatment unit 5.4.2.1 The material of the pretreatment unit shall use materials that do not react with gaseous pollutants and shall not affect the Normal measurement. 5.4.2.2 For dehumidification equipment using extraction cold and dry measurement methods, the technical requirements of Table B.2. In Appendix B shall be met. Dehumidification The setting temperature of the equipment should be set at (0 ～ 4) ℃ (the dew point temperature of the flue gas at the equipment outlet should be ≤4 ℃), and the temperature fluctuation should be within ± 2 ℃ Within, its actual temperature or dew point temperature value should be able to be displayed on the instrument or in the software. 5.4.2.3 If condensate is generated during the dehumidification process of the dehumidification equipment, it shall be collected and discharged through the condensate manually or automatically. The device is discharged in a timely and smooth manner. 5.4.2.4 For instruments equipped with NO2 converters, the NO2 conversion efficiency shall meet the requirements of 6.1.1.10. 5.4.3 Calibration Function Requirements 5.4.3.1 The instrument shall be capable of zero and span calibration. 5.4.3.2 The instrument should be equipped with an easy-to-operate standard gas full-system calibration function, that is, it can complete the sample collection and delivery order from the sample. The whole process calibration of the unit, preprocessing unit and analysis unit. 5.4.4 Air tightness requirements The entire gas path of the instrument should have good airtightness, ensuring all aspects of sample collection, transportation, pretreatment and analysis Connected tightly. The instrument should have the function of checking air tightness on site before use. Instrument air tightness inspection method and operation process See Appendix C. 5.4.5 Data acquisition and processing unit requirements 5.4.5.1 The instrument shall display and record data values that are at least 10% below its zero point and above its full scale. When the measurement results exceed When the temperature is below the zero crossing or 10% above the full scale, the data record can be stored with its minimum or maximum value kept unchanged. Clearly identified in displays and records. 5.4.5.2 The instrument shall have the functions of displaying and setting the instrument time and time label, and the data shall be the average value of the set period. 5.4.5.3 The instrument has Chinese data acquisition, storage, processing and control software. Able to display real-time data, with query history The function of historical data, and can be output in the form of reports or reports. Instrument data acquisition, storage, processing and control software should comply with Appendix A technical requirements. 5.4.5.4 When the instrument is connected to a printer, it shall be able to print the measurement data and other related information during the set time period. 5.4.5.5 The instrument has digital signal output function. 5.4.5.6 After the instrument is powered off, it has the function of automatically saving data.

6 Performance indicators

6.1 Laboratory testing 6.1.1 Gaseous pollutant (SO2, NOX) monitoring unit 6.1.1.1 Minimum detection limit Minimum detection limit of the instrument. ≤1% full scale. 6.1.1.2 Response time (rise time and fall time) Instrument response time. ≤120 s. 6.1.1.3 Repeatability Instrument repeatability (relative standard deviation). ≤2%. 6.1.1.4 Indication error Instrument display error. no more than ± 2% of full scale. 6.1.1.5 1h zero drift and span drift Instrument 1h zero drift and span drift. no more than ± 2% of full scale. 6.1.1.6 Effects of ambient temperature changes The ambient temperature changes within the range of (0 ~ 40) ° C, and the reading of the instrument changes. no more than ± 5% of full scale. 6.1.1.7 Effect of supply voltage changes The power supply voltage varies by ± 10%, and the change of the instrument reading. does not exceed ± 2% of full scale. 6.1.1.8 Effects of interference components Pass in the interference component gases of the corresponding concentrations in Table 1 in sequence, resulting in positive interference and negative interference that changes in the reading of the analytical instrument. Not more than ± 5% of full scale. Table 1 Interfering component gases used in laboratory testing 6.1.1.9 Parallelism The relative standard deviation of three (sets) instruments measuring the same standard sample reading is ≤5%. 6.1.1.10 Nitrogen dioxide conversion efficiency Efficiency of NO2 to NO conversion in NO2 converter. ≥95%. 6.1.2 Flue gas oxygen content monitoring unit 6.1.2.1 Response time (rise time and fall time) Instrument response time. ≤120 s. 6.1.2.2 Repeatability Instrument repeatability (relative standard deviation). ≤2%. 6.1.2.3 Indication error Instrument display error. no more than ± 2% of full scale. 6.1.2.4 1h zero drift and span drift Instrument 1h zero drift and span drift. no more than ± 2% of full scale. 6.1.2.5 Impact of ambient temperature changes The ambient temperature changes within the range of (5 ~ 40) ° C. The change of the instrument reading. not more than ± 5% of full scale. 6.1.2.6 Impact of supply voltage changes The power supply voltage varies by ± 10%, and the change of the instrument reading. does not exceed ± 2% of full scale. 6.1.2.7 Parallelism The relative standard deviation of three (sets) instruments measuring the same standard sample reading is ≤5%. 6.2 On-site detection of pollutant discharge 6.2.1 Measurement accuracy of gaseous pollutants (SO2, NOX) When the reference method measures the average value of the emission concentration of sulfur dioxide and nitrogen oxides RM in the flue gas. a) When ≥250 μmol/mol, the relative accuracy of the reference method comparison test. ≤15%; b) When ≥50 μmol/mol ～ < 250 μmol/mol, the absolute value of the difference between the reference method and the test data pair Value. ≤20 μmol/mol; c) When ≥20 μmol/mol ～ < 50 μmol/mol, the reference method compares the Absolute value. ≤30%; d) When < 20 μmol/mol, the absolute value of the average value of the difference between the reference method and the test data pair. ≤6 μmol/mol. 6.2.2 Accuracy of Oxygen Measurement in Flue Gas Relative accuracy of the reference method for measuring the oxygen content in flue gas. ≤15%. 6.2.3 Accuracy of Flue Gas Humidity Measurement When the reference method measures the average value of flue gas humidity. a) When it is > 5.0%, the relative error of the mean value of the reference method comparison test measurement results. not more than ± 25%; b) When ≤5.0%, the absolute error of the mean value of the test results compared with the reference method. not more than ± 1.5%.

7 Detection methods

7.1 Laboratory testing requirements and methods 7.1.1 General requirements 7.1.1.1 At least 3 sets of instruments of the same model shall be selected for simultaneous testing at the designated laboratory site. 7.1.1.2 When the instrument has dual ranges or multiple ranges, only the minimum range of the instrument is tested for technical indicators; and its gaseous state The minimum detection range of the pollutant (SO2, NOX) monitoring unit does not exceed 150 μmol/mol. 7.1.1.3 Except for the zero and span calibration of the instrument during the test period, unplanned maintenance, repair and maintenance of the instrument are not allowed. Adjustment. 7.1.1.4 If the test is interrupted due to a power supply problem, after the power supply returns to normal, continue the test and the completed test Test indicators and data are valid. 7.1.1.5 If the test is interrupted due to an instrument failure, restart the test after the instrument returns to normal, and the completed test The test indicators and data are invalidated; during the test, the number of failures of each (set) instrument is ≤ 2 times. 7.1.1.6 All technical indicators are tested in accordance with the entire system process of the instrument, and the test data is collected and processed by instrument data The unit stores the final result of the record. The test results of each set of technical indicators must all meet the requirements of 6.1. 7.1.2 Requirements for instruments and equipment used in testing 7.1.2.1 Thermocouple or resistance thermometer. (-50 ～ 400) ℃, the deviation of the displayed value should not exceed ± 2 ℃. 7.1.2.2 Electronic stopwatch. The minimum division value is not greater than 0.01 s. 7.1.2.3 Ambient temperature influence test device. (-10 ～ 50) ℃, the deviation of the displayed value should not exceed ± 2 ℃. 7.1.2.4 Voltage regulator. (0 ～ 250) V. 7.1.2.5 Pressure gauge. The minimum graduation value is not greater than 10 Pa. 7.1.2.6 Ozone generator. (0 ～ 250) μmol/mol, linearity error shall not exceed ± 1%. 7.1.2.7 Megohmmeter. voltage 500 V, (0 ~ 500) MΩ. 7.1.3 Reference material requirements 7.1.3.1 Zero gas (zero-point gas). Standard gas containing sulfur dioxide and nitrogen oxides with a concentration of ≤0.1 μmol/mol (1 Generally high purity nitrogen, ≥99.999%), the concentration of other gases must not interfere with the instrument's measurement readings. 7.1.3.2 Standard gas. The national standard gas approved by the national metrological administrative department, the uncertainty of which does not exceed ± 2.0%. Span calibration gas refers to a standard gas with a concentration in the range of (80% to 100%) full scale. Lower concentration standards If the gas does not meet the uncertainty requirements, it can be obtained by using a high-concentration standard gas with equal proportion dilution, etc. The precision of the proportional dilution device should be within 1.0%. 7.1.4 Laboratory testing methods 7.1.4.1 Appearance Check visually and manually. 7.1.4.2 Heating temperature of sampling tube and sample delivery pipeline The instrument sampling tube and the sample delivery pipeline are heated to their set temperatures and stabilized for 10 min. And the front end of the sample delivery pipeline (15 to 20 cm away from the inlet), the middle and rear end of the heating section (15 to 20 away from the outlet) cm), the average of the temperature values at the three measurement points is the heating temperature. (For sampling tubes and sample transfer lines For integrated, simultaneous heating and temperature control, measurement is performed by one pipeline) 7.1.4.3 Minimum detection limit After the instrument under test runs stably, pass the zero gas into the analysis instrument, and record the average value of the data in this time period ri (record For 1 data), to obtain at least 25 data. Calculate the minimum detection limit DL of the instrument under test according to formula (1).   5.2 1 rr L (1) In the formula. DL -------- The minimum detection limit of the instrument to be tested,%; R -------- Full scale value of the instrument to be measured, μmol/mol (mg/m3); r -------- the average value of the measured value of the instrument to be measured, μmol/mol (mg/m3); ri ------- the i-th measurement value of the instr...

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