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HJ 692-2014 English PDF

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HJ 692-2014: Stationary source emission. Determination of nitrogen oxides. Non-dispersive infrared absorption method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
HJ 692-2014	319	Add to Cart	3 days	Stationary source emission. Determination of nitrogen oxides. Non-dispersive infrared absorption method	Valid

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Basic data

Standard ID: HJ 692-2014 (HJ692-2014)
Description (Translated English): Stationary source emission. Determination of nitrogen oxides. Non-dispersive infrared absorption method
Sector / Industry: Environmental Protection Industry Standard
Classification of Chinese Standard: Z25
Classification of International Standard: 13.040.40
Word Count Estimation: 12,186
Date of Issue: 2/7/2014
Date of Implementation: 4/15/2014
Quoted Standard: GB/T 16157; HJ/T 75; HJ/T 76; HJ/T 373; HJ/T 397
Regulation (derived from): ?Ministry of Environmental Protection Announcement 2014 No. 10
Issuing agency(ies): Ministry of Ecology and Environment
Summary: This Standard specifies the determination of non-stationary sources of nitrogen oxides in the exhaust gas dispersive infrared absorption method. This Standard applies to the determination of emissions from stationary sources of nitrogen oxides. This Stand

HJ 692-2014: Stationary source emission. Determination of nitrogen oxides. Non-dispersive infrared 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 nitrogen oxides.Non-dispersive infrared absorption method People's Republic of China National Environmental Protection Standards Determination Stationary source emission of nitrogen oxides Non-dispersive infrared absorption method Stationary source emission-Determination of nitrogen oxides- Non-dispersive infrared absorption method (release draft) 2014-2-7 release 2014-4-15 implementation Ministry of Environmental Protection released -I-

Preface II 1 Scope 1 2 Normative references 1 3 Terms and definitions ..1 4 principle of the method 1 5 interference and eliminate ..1 6 Reagents and materials ..1 7 ..2 instruments and equipment 8 Sample .2 9 Step 2 Analysis 10 Results Calculation and representation .3 11 precision and accuracy .3 12 Quality assurance and quality control ..4 13 Precautions .4 Appendix A (informative) measured before and after the performance of the instrument Checklist .5 -II-

Foreword

To implement the "People's Republic of China Environmental Protection Law" and "People's Republic of China Air Pollution Prevention Law," guard ring Environment, protect people's health, specifications fixed monitoring methods source emission of nitrogen oxides, the development of this standard. This standard specifies the determination of stationary sources of nitrogen oxides in the exhaust gas Central Africa dispersive infrared absorption method. This standard is the first release. This standard is developed by the Ministry of Environmental Protection Science, Technology organization. This standard drafting units. China National Environmental Monitoring Center, Shanghai Environmental Monitoring Center, Hebei Province Environmental Monitoring Center. The standard verification unit. Environmental Monitoring Center Station of Hebei Province, Shenyang Environmental Monitoring Central Station, Hubei environmental monitoring Heart Station, Guiyang Municipal Environmental Monitoring Center, Tianjin Environmental Monitoring Center, Qinhuangdao City environmental protection monitoring station This standard MEP February 7, 2014 for approval. This standard since April 15, 2014 implementation. The standard explanation by the Ministry of Environmental Protection. -1- Determination of Non-Stationary source emission of nitrogen oxides dispersive infrared absorption method

1 Scope

This standard specifies the determination of stationary sources of nitrogen oxides in the exhaust gas Central Africa dispersive infrared absorption method. This standard applies to the determination of stationary sources of nitrogen oxides in the exhaust gas. This method of nitric oxide (as NO2) detection limit of 3mg/m3, measured lower limit of 12mg/m3.

2 Normative references

This standard refers to the contents of the following documents or the terms. For undated references, the effective version applies to this standard. GB/T 16157 Stationary source emission-Determination of particulates and gaseous pollutants sampling methods HJ/T 75 stationary sources Continuous Emission Monitoring Technical Specification (Trial) HJ/T 76 stationary sources Continuous Emission Monitoring system technical requirements and test methods (Trial) HJ/T 373 stationary sources Monitoring Quality Assurance and Quality Control Technical Specifications HJ/T 397 stationary source emission monitoring and technical specifications

3 Terms and Definitions

3.1 Nitrogen oxides nitrogen oxides It refers to stationary sources of nitrogen oxides present in exhaust gas to nitric oxide (NO) and nitrogen dioxide (NO2) forms. 3.2 Calibration span calibration span The upper limit of the instrument calibration, the calibration standard gas concentration value (if multi-point calibration, compared with the highest standards of calibration gas concentration values). calibration Range (hereinafter referred to by CS) is selected to be appropriate, the average concentration of gaseous pollutants measured should be between 20% ~ 100% CS shall not exceed Over CS. When the determination of low concentrations of nitrogen oxides (NOx), in order to achieve the data quality objectives, do not choose too high CS. CS should be small Than or equal to the instrument's full scale. 3.3 Zero drift zero drift Before and after the determination of the percentage deviation of the calibration range of the instrument measurement results for the same zero gas. 3.4 Span drift span drift Before and after the determination of the percentage deviation of the calibration range of the instrument measurement results of the same standard gas. 3.5 system deviation system bias Standard gas directly into the host instrument air intake (direct measurement mode) and the measurement results obtained by the standard gas sampling tube end into instrument The percentage deviation of calibrated span measurement result is (system measurement mode) or obtained absolute error.

4 principle of the method

The use of NO gas infrared spectral regions, particularly selective 5.3μm wavelength of light absorbed by the Lambert - NO Beer law quantitative exhaust And NO2 in the exhaust gas through the converter for the reduction of the concentration of NO after.

5 and elimination of interference

This method can eliminate the interference of interfering gases by tandem-type pneumatic detectors or gas filter correlation technique. Exhaust gas particulate matter and water vapor Interference, as well as the impact on the measured temperature of the exhaust gas through the filter dust, desiccant cooling means to cool the exhaust gas and the rapid addition of water to reduce or eliminate Interference to an acceptable level. -2-

6 Reagents and materials

6.1 of nitric oxide, nitrogen dioxide standard gas Gas certified environmental standards, uncertainty of not more than 2% of the current uncertainty or attainable. Check the indication error and standard deviation system Quasi-gas concentration is 40% ~ 60% CS or equal to CS. 6.2 Nitrogen Purity greater than 99.99%.

7 instruments and equipment

7.1 Non-dispersive infrared absorption method nitrogen oxides analyzer 7.1.1 Composition Non-dispersive infrared absorption method nitrogen oxides analyzer (hereinafter. the instrument) in the constitution. the host (including flow control devices, air pump, Detectors, etc.), of NO2 converter, the sampling tube (dust containing means and heating means), windpipe, desiccant cooling device or the like. 7.1.2 Requirements (1) has a display sampling flow; (2) shows the absolute value of error. ≤5% (concentration < 100μmol/mol, ≤5μmol/mol); (3) the absolute value of system deviation. ≤5% CS; (4) with the elimination of interference functions. 7.2 Gas Flowmeter Sampling flow measuring instrument for the measurement range and accuracy of sampling equipment to meet flow requirements. 7.3 standard gas cylinder With adjustable pressure reducing valve, adjustable rotor flowmeter and airway. 7.4 collection bag Bag method used to calibrate the instrument. Volume 4 L ~ 8 L, lining material should be used to test the impact of a small component of inert material.

8 sampling locations and sampling point

Setting the sampling location and sampling point comply with HJ/T 76, HJ/T 373 and GB/T 16157 of. Sampling tube distal end of the instrument as much as possible by Exhaust near the center position.

9 analysis step

9.1 scale calibration NO standard gas measuring instrument in accordance with this standard 9.2 steps, if the error is shown in line with Article 7.1.2 (2) requirements, the instrument is available. Otherwise, the need to calibrate. The calibration method. (1) bag method. first with gas flowmeter calibration instrument sample flow. Standard clean gas collection bag after filling emptied repeatedly Three times, and then filled with reserve. Press the instrument calibration procedures specified in the instructions for calibration. (2) cylinder method. with a valve, adjustable rotameter and airway standard sampling tube connected to the gas cylinder and open the cylinder Gas valves, regulators rotameter to a predetermined flow rate instrument, the instrument passed into the intake port. Note that each connection can not leak. Press the instrument calibration procedures specified in the instructions for calibration. -3- 9.2 Determination 9.2.1 Zero calibration (1) according to the instrument manual, the instrument is properly connected host, sampling tube (including dust means and heating means), windpipe, dehumidification Cooling means, and other means. (2) the heating device, desiccant cooling devices and other devices powered on, reaching instrument conditions specified in the instructions. (3) power on the host to clean ambient air or nitrogen gas is zero, the instrument zero calibration. 9.2.2 Sample Determination The sampling tube into the flue sampling point, sample flow to the instrument specified continuous automatic sampling, sample tube cleaning exhaust gas, the exhaust gas extraction Measured can be recorded after instrument readings stable readings recorded at least once every minute monitoring results. 9.3 Determination of the end After the measurement, the sampling tube in clean ambient air or high purity nitrogen, showing the value of the instrument back to zero after the shutdown. 9.4 NO2 to NO conversion rate determination method A certain concentration of NO2 standard gas into the converter before entering the measuring instrument to measure the concentration ratio results and the standard gas Is NO2 to NO conversion. 10 Results Calculation and representation 10.1 Calculation Results NOx concentration equal to the concentration of NO and NO2 converted to NO concentration sum, calculated as NO2 standard state's (273K, Concentration 101.325kPa) under. ߩ NO ୶ ൌ 46ߩ NO ୶ 22.4 ሺ 1 ሻ Where. ߩ NO ୶-- under standard conditions dry exhaust gas NOx concentration, mg/m3; ߩ NO ୶-- dry NOx in the exhaust gas volume concentration, μmol/mol. 10.2 NO2 to NO conversion efficiency is calculated ܧ NO మ ൌ ߩ ୢ ߩ ୱ ൈ 100% ሺ 2 ሻ Where. ܧ NO మ-- NO2 to NO conversion efficiency,%; ߩ ୢ-- Direct Determination of the concentration of the standard gas, μmol/mol mode; ߩ ୱ-- NO2 concentration of the standard gas, μmol/mol. 10.3 The results are shown The results of the concentration of nitrogen oxides retain only integer bit, when the calculated concentration higher result, retained four significant digits. 11 precision and accuracy The precision and accuracy of measurement of NO NO2 concentrations are counted. The precision of the method 11.1 Six laboratories in a power plant emissions of NO concentration were measured simultaneously. One of the units in the exhaust gas concentration of 588mg/m3 ~ 609mg/m3, average of 592mg/m3; another unit in the exhaust gas concentration 187mg/m3 ~ 201mg/m3, average of 195mg/m3. Laboratory relative standard deviations were. 2.5% to 3.6%, 1.4% ~ 4.2%; -4- Interlaboratory relative standard deviations were. 1.4%, 2.4%; Repeatability limit. 55mg/m3,17mg/m3; Reproducibility limit. 7.4mg/m3,12mg/m3. 6 laboratory levels of 100mg/m3,396mg/NO standard gas m3,1.02 × 103mg/m3 were measured. Laboratory relative standard deviations were. 0 to 1.0%, from 0 to 0.6%, from 0 to 0.4%; Interlaboratory relative standard deviations were. 1.9%, 1.2%, 0.4%; Repeatability limit. 2.1mg/m3,3.7mg/m3,5.1mg/m3; Reproducibility limit. 4.9mg/m3,12mg/m3,9.6mg/m3. Accuracy of the method 11.2 6 laboratory standard levels of NO gas 100mg/m3,396mg/m3,1019mg/m3 were measured. Relative error. 0.3% to 3.4% - 0.8% to 2.0%, from 0.4% to 1.4%; The final value of the relative error. 1.2% ± 2.7%, 0.4% ± 2.2%, 0.8% ± 0.7%. 12 Quality Assurance and Quality Control 12.1 Instruments and some auxiliary equipment such as a barometer, thermometer must be approved by the relevant units certified by metrological verification, and in the test validity Within limits. 12.2 instrument should be more than the ability to resist negative pressure flue negative pressure to prevent the instrument sampling flow is reduced, resulting in low or measurement results can not be measured. The components of the instrument should be connected firmly 12.3, measured before and after the screening equipment shall be in accordance with the requirements of air tightness, can be blocking tight inlet, if the instrument Sample flow rate indication to zero in 2min, showed air-tightness. Determination of zero gas and NO standard gas before the 12.4 measured according to the standard 9.2 step, the Department calculated indication error measurement and inspection equipment System deviation, if the indication error and/or system deviation does not comply with Article 7.1.2 (2) and (3) requirements should find out the reasons and make the appropriate repair dimension Protection, until only after the conduct of monitoring to meet the requirements. Determination of the standard zero gas and NO gas was measured according to the standard after 12.5 9.2 step, the Department calculated indication error measurement and inspection equipment System deviation. If the indication error and systematic bias in line with Article 7.1.2 (2) and (3) requirements, determines whether the measurement results of this sample is valid; otherwise, the contractor The measurement results once the final version of the sample is invalid. Zero drift 12.6 measured at least once a month before and after the span drift checks. Zero drift, span drift absolute value should be small To 3% CS (when calibrated span ≤200μmol/mol, less than 5.0% CS). Otherwise, it is timely for instrument calibration and maintenance. 12.7 Determination completed before the shutdown, according to the requirements of the specification through the instrument into the ambient air or high purity nitrogen flushed clean instruments. 12.8 at least once every six months with a low (< 20% CS), medium (40% ~ 60% CS), high (80% ~ 100% CS) concentration standard Quasi-linear gas relative error of the instrument calibration, the measured value with the standard gas concentration values or absolute error should be consistent with 7.1.2 (2) requirements. 12.9 measured at least once every six months NO2 to NO conversion efficiency, if the conversion efficiency of less than 85%, the proposed replacement of the reducing agent. 13 Notes 13.1 Determination of desiccant cooling unit and before checking gas pipeline route, and clean the particle filter, replace the filter if necessary. 13.2 Determination should be checked prior to the sampling tube heating system is working properly. 13.3 dehumidification condensate water drain out of the cooling device to prevent the impact of the measurement results. 13.4 Mining flow rate changes directly affect the measuring instrument readings, at any time during the determination to do the monitoring. 13.5 The measurement results should be between 20% to 100% of instrument calibration range. NO2 concentrations of NO2 concentration is too high 13.6 will affect the normal operation of the converter, it is recommended to enter the converter is not greater than 200μmol/mol. -5-

Appendix A

(Informative) Measured before and after the performance of the instrument Checklist Laboratory name Location Determination Equipment manufacturing plant as the model, serial number principle Of calibrated span (CS) (μmol/mol, mg/m3) gas flow rate (L/min) Ambient temperature (oC) ambient pressure (kPa) relative humidity (RH%) Standard gas production unit measured pollutant name Testers Determination Date The date Table A-1 shows error After the measurement before the standard gas measurement Name Concentration/A rated value/ܣ ௜ mean/ܣ ҧ ௜ Indication error /% ሺ ܣ ҧ ௜ െ ܣ ሻ/ܣ Found/ܣ ௜ mean/ܣ ҧ ௜ Indication error /% ሺ ܣ ҧ ௜ െ ܣ ሻ/ܣ NO NOTE. To determine the value ܣ ௜ refers to standard gas measurement results in direct measurement mode is obtained Table A-2 system deviation After the measurement before the standard gas measurement Name concentration measurement value of the system deviation ሺ ܤ ത െ ܣ ҧ ሻ/ܥ.ܵ. Measured value system deviation ሺ ܤ ത െ ܣ ҧ ሻ/ܥ.ܵ. A ܣ ҧ B ܤ ത A ܣ ҧ B ܤ ത Zero gas NO Note. A measured value of 1 means the standard gas measurement results in direct measurement mode; 2 measured values B refers to the measurement result in the system standard gas measurement mode. Table A-3 zero drift and span drift Standard gas Date Time Zero drift Span drift Zero drift absolutely zero reading error calibration Range Δ ܼ ܥ.ܵ. Standard gas reading Span drift Absolute error calibration Range Δ ܵ ܥ.ܵ. Name Concentration Starting (Z0) finally (Zi) ΔZ = Zi -Z0 Starting (S0) finally (Si) ΔS = Si -S0 NO NOTE. Starting expressed measured before, after the final determination indicates. Table A-4 NO2 to NO conversion efficiency Standard gas measurement results Name Concentration/A rated value/ܣ ௜ mean/ܣ ҧ ௜ conversion efficiency /% (ܣ ҧ ௜/ܣ) NO2 NOTE. To determine the value ܣ ௜ mean NO2 standard gas is converted to NO after the reduction, under the direct measurement mode to get the NO measurement results. ......

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