Procedures of Shanghai Municipality on Inquiry and Handling of Deceptive Behavior of Environmental Monitoring Data
On May 18, Xiling Gorge of the Yangtze River after rain, with high gorges and flat lakes, green mountains and green waters, and swirling clouds, formed a beautiful natural ecological beauty. Mercury pollution is becoming a serious global pollution, especially coal-fired power plants account for a large proportion. In this paper, the mercury pollution situation at that time and the monitoring requirements of various governments have been sorted out, and the calibrators, catalytic conversion methods, measurement methods, key points and precautions in the system planning of the mercury continuous emission monitoring system CEMS have been introduced. Polaris Atmosphere News: A few days ago, Henan Province issued the operation plan for Henan Province to promote industrial restructuring and win the battle against pollution. The plan requires that the ultra-low emission transformation of steel, aluminum carbon, cement, glass, coking and electrolytic aluminum operations in the province should be completed by the end of 2019. The full text is as follows: On December 31, 2018, Li Ganjie, the minister of the ecological environment department of the ultra-low emission dust meter, went to Beijing, Langfang City, Hebei Province, and Tianjin to visit the ecological environment monitoring and strengthening supervisors on behalf of the Party Leadership Group and the leadership of the Ministry of Ecological Environment Protection, They also extended New Year greetings to the broad cadres and workers of the national ecological environment system and all the people from all walks of life who care and support the ecological environment protection.
Polaris VOCs Online News: Recently, the Ministry of Ecology and Environment issued the Skills Requirements and Detection Methods for the Continuous Monitoring System of Non methane Total Hydrocarbons in Exhaust Gas from Fixed Pollution Sources (HJ 1013-2018).
Skill requirements and detection methods for continuous monitoring system of non methane total hydrocarbon in waste gas from fixed pollution sources
Specifications and test procedures for nonmethane hydrocarbons continuous emission monitoring system in stationary sources
(Implemented on HJ 1013-2018 July 1, 2019)
This standard is formulated in order to comply with the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Air Pollution, protect the ecological environment, ensure human health, standardize the performance and quality of the continuous monitoring system for non methane total hydrocarbons in waste gas from fixed pollution sources, and monitor the pollutants discharged from fixed pollution sources. This standard specifies the primary skill requirements, test items and test methods for the continuous monitoring system of non methane total hydrocarbon in waste gas from fixed pollution sources. Annexes A and C of this standard are standard annexes, and Annex B is informative annexes. This standard is issued for the first time.
Skill Requirements and Detection Methods for Continuous Monitoring System of Non methane Total Hydrocarbons in Waste Gas from Fixed Pollution Sources (HJ 1013-2018)
preface
This standard is formulated in order to comply with the Environmental Protection Law of the People's Republic of China and the Law of the People's Republic of China on the Prevention and Control of Air Pollution, protect the ecological environment, ensure human health, standardize the performance and quality of the continuous monitoring system for non methane total hydrocarbons in waste gas from fixed pollution sources, and monitor the pollutants discharged from fixed pollution sources.
This standard specifies the primary skill requirements, test items and test methods for the continuous monitoring system of non methane total hydrocarbon in waste gas from fixed pollution sources.
Annexes A and C of this standard are standard annexes, and Annex B is informative annexes.
This standard is issued for the first time.
This standard is prepared by the Department of Ecological Environment Monitoring and the Department of Regulations and Standards of the Ministry of Ecological Environment.
This standard is drafted by China Environmental Monitoring Center for ultra-low CEMS system.
This standard was approved by the Ministry of Ecology and Environment on December 29, 2018.
This standard shall come into force as of July 1, 2019.
This standard is interpreted by the Ministry of Ecology and Environment.
Skill requirements and detection methods for continuous monitoring system of non methane total hydrocarbon in waste gas from fixed pollution sources
1 Applicable scale
This standard specifies the composition, skill requirements, performance indicators and detection methods of the continuous monitoring system for non methane total hydrocarbons in waste gas from fixed pollution sources.
This standard is applicable to the design, production and detection of a continuous monitoring system for non methane total hydrocarbons in waste gas from fixed pollution sources.
2. Standard citation documents
This standard refers to the following documents or their clauses. However, for undated reference documents, their valid versions are applicable to this standard.
GB 3836.1 Explosive Atmospheres Top Part: General Requirements for Equipment
GB/T 4208 Degrees of Protection Provided by Enclosures (IP Code)
GB/T 16157 Determination of Particulate Matter and Sampling Method for Gaseous Pollutants in Exhaust Gas from Stationary Pollution Sources
HJ 38 Determination of total hydrocarbon, methane and non methane total hydrocarbon in waste gas from fixed pollution sources Gas chromatography
HJ 75 Technical Standards for Continuous Monitoring of Flue Gas (SO2, NOx, Particulates) Emissions from Fixed Pollution Sources
HJ 76 Technical Requirements and Test Methods for Continuous Monitoring System of Flue Gas (SO2, NOx, Particulate Matter) Emission from Fixed Pollution Sources
3 Terms and definitions
The following terms and definitions are applicable to this standard.
3.1 Non methane hydrocarbons (NMHC)
Under the conditions of HJ 38 standard rules, there are other gaseous organic substances except methane corresponding to the hydrogen flame ionization detector
The sum of compounds, unless otherwise specified, is calculated in carbon.
3.2 Non methane hydrocarbons continuous emission monitoring system (NMHC-CEMS)
All equipment required for continuous monitoring of emission concentration and emission of NMHC-CEMS in waste gas from fixed pollution sources.
3.3 Analysis cycle time
The time interval between two groups of measurement results is given when the system is running continuously.
3.4 Response factor
In this standard, the non dimensional ratio between the echo value of other gaseous organic compounds measured by hydrogen flame ionization detector and the echo value of propane measured.
3.5 Conversion efficiency
The power used to oxidize gaseous organic compounds other than methane by catalytic oxidation equipment.
4 Composition and Structure of the System
4.1 System composition
Fixed pollution source NMHC-CEMS consists of non methane hydrocarbon monitoring unit, waste gas parameter monitoring unit and data collection and processing unit, as shown in Figure 1. The system measures the concentration of NMHC in waste gas and the parameters of waste gas (temperature, pressure, flow rate or flow, humidity, etc.). If the oxygen content is involved in the calculation of the converted concentration of pollutants, the system measures the oxygen content together, calculates the emission rate and amount of pollutants in waste gas together, displays and prints various parameters and charts, and transmits them to the management department through data, graphics and text.
4.2 Architecture
The NMHC-CEMS architecture mainly includes sample collection and transmission equipment, preprocessing equipment, profiling equipment, data collection and transmission equipment and other auxiliary equipment. Depending on the measurement methods and principles of the system, the system may consist of all or part of the above structures.
4.2.1 Sample collection and transmission equipment
The sample collection and transmission equipment mainly includes sampling probe, sample transmission pipeline, flow control equipment and sampling pump. The VOCs online monitoring system generally adopts the sampling measurement method system, which has sample collection and transmission equipment. See 5.4.1 for specific skill requirements.
4.2.2 Pretreatment equipment
Pretreatment equipment mainly includes sample filtering equipment, etc. See 5.4.2 for specific skill requirements.
4.2.3 Profiling instrument
The analyzer is used to measure and analyze the collected waste gas samples of pollution sources. See 5.4.3 for specific skills.
4.2.4 Data collection and transmission equipment
The data collection and transmission equipment is used to collect, process and store monitoring data, and can transmit monitoring data and equipment operation information according to the instructions of the central accounting machine. See 5.4.4 for specific skill requirements.
4.2.5 Auxiliary equipment
The extraction measurement system is selected, and its auxiliary equipment mainly includes hydrogen gas source, tail gas emission equipment, back blowing purification and control equipment, zero air pretreatment equipment, etc. See 5.4.5 for specific skill requirements.
5 Skill requirements
5.1 Appearance requirements
5.1.1 NMHC-CEMS shall have product nameplate, which shall be marked with product name, type, production unit, factory number, manufacturing date, power supply standard, primary parameter range and other information.
5.1.2 The appearance of NMHC-CEMS shall be intact and free from obvious defects, all parts and components shall be connected firmly, all operation keys and buttons shall be used flexibly and positioned accurately.
5.1.3 The NMHC-CEMS host panel is clear, painted firmly, and the characters and identifications are easy to identify, so there should be no shortcomings that affect the reading.
5.1.4 The enclosure or cover of NMHC-CEMS outdoor parts shall at least meet the requirements of IP55 in GB/T 4208.
5.2 Operating conditions
NMHC-CEMS shall be able to operate normally under the following conditions:
a) Indoor ambient temperature: (15~35) ℃; Outdoor ambient temperature: (- 20~50) ℃;
b) Relative humidity: ≤ 85%;
c) Atmospheric pressure: (80 ～ 106) kPa;
d) Power supply voltage: AC (220 ± 22) V, (50 ± 1) Hz.
Note: Under special environmental conditions, the equipment of system equipment shall meet the application requirements of local environmental conditions.
5.3 Safety requirements
5.3.1 Insulation resistance
When the ambient temperature is (15~35) ℃ and the relative humidity is ≤ 85%, the insulation resistance of the system power supply terminal to the ground or the enclosure shall not be less than 20 M Ω.
5.3.2 Insulation strength
When the ambient temperature is (15~35) ℃ and the relative humidity is ≤ 85%, the system shall not show breakdown or flashover for 1 min under 1500 V (effective value) and 50 Hz sine wave test voltage.
5.3.3 The system shall have leakage protection equipment and good grounding measures to prevent damage to the system caused by lightning stroke.
5.3.4 The installers and users shall establish effective safety measures to prevent flammable, explosive, toxic and harmful gases from leaking, and prevent other safety hazards. If the equipment installation environment has explosion-proof requirements, it is necessary to follow the relevant rules in GB 3836.1.
5.4 Functional requirements
5.4.1 Requirements for sample collection and transmission equipment
5.4.1.1 The raw materials of the sample collection and transmission equipment shall be high temperature resistant, corrosion resistant, non adsorptive and non responsive to the pollutants to be measured, and shall not affect the normal measurement of the pollutants to be measured.
5.4.1.2 The sample collection equipment shall have the functions of heating, heat preservation and back blowing purification. The heating shall be uniform and stable, and the heating temperature shall be above 120 ℃ or 20 ℃ higher than the flue gas temperature, whichever is higher. The heating temperature value can be displayed and queried in the cabinet or system software.
5.4.1.3 The sample collection equipment shall have the function of particulate matter filtration. The front end or rear end of the sampling equipment shall be equipped with a particulate filter that is easy to replace or clean, and the filter shall be able to filter at least 5 μ Particulates above m particle size.
5.4.1.4 The sample transmission pipeline shall have the function of stable, uniform heating and thermal insulation. The heating temperature shall be above 120 ℃ or 20 ℃ higher than the flue gas temperature, whichever is higher. The heating temperature value can be displayed and queried in the cabinet or system software.
5.4.1.5 There shall be at least two gas transmission pipes wrapped in the sample transmission pipeline, one for sample gas collection and transmission, and the other for full calibration of standard gas; The system sample collection and transmission equipment shall have functional requirements for completing the whole system calibration of the system.
5.4.1.6 The sampling pump shall have the ability to overcome the negative pressure in the flue to meet the requirements of air extraction, and ensure accurate, reliable and relatively stable sampling flow.
5.4.2 Pretreatment equipment
5.4.2.1 Pretreatment equipment and its components shall be easy to sort out and replace, and raw materials shall use data that do not absorb or react with the pollutants to be measured.
5.4.2.2 In order to prevent particulate matter from polluting the analyzer, a precision filter can be set before the gas sample enters the analyzer. The precision filter should at least be able to filter (0.5~2) μ M particle size.
5.4.3 Requirements for analyzer
5.4.3.1 The analyzer selected for gas chromatography shall have the functions of active recording of chromatogram files, query of historical spectrograms, etc.
5.4.3.2 The analyzer shall have the function of real-time or periodic detection of current flame conditions; Once the flame is detected to be extinguished, it is necessary to cut off the combustion air source.
5.4.4 Requirements for data collection and transmission equipment
5.4.4.1 Data values that exceed at least 10% of the zero point and range shall be displayed and recorded. When the measurement results exceed 10% of the zero point and the range, the data record stores the zui small value or the zui large value.
5.4.4.2 It shall have the function of displaying and setting system time and time tag, and the data shall be the average value of the set period.
5.4.4.3 Real time data can be displayed, with the function of querying historical data, and can be output in the form of reports or reports. See Appendix A for the format requirements of relevant daily, monthly and annual reports.
5.4.4.4 It has digital signal output function.
5.4.4.5 It shall have Chinese data collection, recording, processing and control software. See Appendix B of HJ 76 for data collection, recording and processing requirements.
5.4.4.6 After the system is powered off, it can actively save data; After the rehabilitation power supply, the system can be started actively, and the rehabilitation operation is normal.
5.4.5 Auxiliary equipment requirements
5.4.5.1 Stainless steel materials shall be used for connecting pipelines of hydrogen and gas sources. Once hydrogen leakage is detected, the gas source shall be cut off actively.
5.4.5.2 The purity of hydrogen shall at least reach 99.99%, and the purity of gas source for other operations shall meet the operating requirements of the analyzer.
5.4.5.3 The exhaust pipe of the system shall be laid in a standard way and shall not be placed randomly.
5.4.5.4 The exhaust gas emission equipment of the system shall be able to ensure that the moisture in the exhaust gas does not condense, accumulate or even freeze, resulting in blockage of the exhaust gas emission pipeline and poor exhaust. If necessary, it shall be equipped with heating or tracing equipment, gas-liquid separation equipment and other facilities.
5.4.5.5 The system shall be equipped with timed active blowback equipment according to the actual needs of the site to periodically blowback other measuring components such as the sample collection equipment, so as to avoid blocking caused by the accumulation of particles.
5.4.5.6 The zero air pretreatment equipment shall have the functions of dust removal, water removal, oil removal, hydrocarbon removal, etc., and its zero air shall meet the requirements of 7.1.2.2.
5.4.5.7 The internal gas pipelines, circuits, data transmission lines, etc. of the system shall be laid in a standard way, and similar pipelines shall be centralized as far as possible; Different types of pipelines or pipelines with different functions and directions shall be identified clearly; All wiring shall be safe and reasonable for easy searching, protection and repair.
5.4.6 Calibration function requirements
5.4.6.1 The system shall be calibrated manually and/or actively.
5.4.6.2 The system of sampling measurement method shall have fixed and easy to operate calibration function of the whole system of standard gas.
6 Performance index
6.1 Laboratory testing
6.1.1 Analysis cycle
System analysis period: ≤ 2 min.
6.1.2 Instrument detection limit
Detection limit of the system: ≤ 0.8 mg/m3.
6.1.3 Repeatability
Repeatability (relative standard deviation): ≤ 2%.
6.1.4 Linear error
Linear error: not exceeding ± 2% of full scale.
6.1.5 24h drift
24 h zero drift and span drift: no more than ± 3% of full scale.
6.1.6 Impact of ambient temperature change
When the ambient temperature changes in the scale of (15~35) ℃, the change of the indication of non methane hydrocarbon shall not exceed ± 5% of the full scale.
6.1.7 Effect of injection flow change
The change of injection flow is ± 10%, and the change of non methane hydrocarbon indication is not more than ± 2% of full scale.
6.1.8 Impact of power supply voltage change
The change of power supply voltage is ± 10%, and the change of non methane hydrocarbon indication value is not more than ± 2% of full scale.
6.1.9 Effect of oxygen
The influence of oxygen on the measurement of zero point and measuring range point shall not exceed ± 2% of full range.
6.1.10 Echo factor
The relative mass response factor of other VOCs components relative to propane when measuring non methane total hydrocarbons in the system is necessary to meet the requirements of a certain scale, as shown in Table 1.
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6.1.11 Conversion power
The conversion power of equipment using catalytic oxidation technology to oxidize gaseous organic compounds other than methane shall not be less than 95%.
6.1.12 Parallelism
The relative standard deviation of the same standard sample indication measured by three systems shall not exceed 5%.
6.2 On site testing of pollutant discharge
6.2.1 Analysis cycle
System analysis period: ≤ 3 min.
6.2.2 24h drift
24 h zero drift and span drift: no more than ± 3% of full scale.
6.2.3 Accuracy
When the reference method is used to measure the average concentration of non methane total hydrocarbons:
a) When<50 mg/m3, the absolute value of absolute error of average value of measurement results of NMHC-CEMS and reference method: ≤ 20mg/m3;
b) When ≥ 50 mg/m3 ～ ＜ 500 mg/m3, the relative accuracy of NMHC-CEMS and reference method measurement results: ≤ 40%;
c) When ≥ 500 mg/m3, the relative accuracy of NMHC-CEMS and reference method measurement results is ≤ 35%.
6.2.4 Exhaust gas parameters and performance indicators
The performance index requirements of exhaust gas parameters (oxygen, flow rate, smoke temperature, humidity) shall conform to relevant requirements of HJ 76.
