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Effective from August 1st! National standard for "Technical Specification for Continuous Monitoring System of Non methane Total Hydrocarbons in Waste Gas from Fixed Pollution Sources"

Time：

2023-08-04

Effective from August 1st! National standard for "Technical Specification for Continuous Monitoring System of Non methane Total Hydrocarbons in Waste Gas from Fixed Pollution Sources"

The Ministry of Ecology and Environment has officially released the "Technical Specification for Continuous Monitoring System of Non methane Total Hydrocarbons in Waste Gas from Fixed Pollution Sources" (standard number: HJ 1286-2023), which specifies the composition, function, technical performance, monitoring station building, installation, technical index debugging and testing, technical acceptance, daily operation and maintenance of the continuous monitoring system for non methane total hydrocarbons and related waste gas parameters in waste gas from fixed pollution sources Requirements related to quality assurance and control, as well as data review and processing. This standard was first released and officially implemented on August 1, 2023.

It is understood that this standard basically continues the "Notice on Issuing the Technical Guidelines for Continuous Monitoring of Non methane Total Hydrocarbon Emissions from Fixed Pollution Source Waste Gas (Trial)" (Environmental Protection Office Monitoring Letter [2020] No. 90), which includes the composition, function, installation, daily operation and management of the continuous monitoring system for non methane total hydrocarbon emissions and related gas emission parameters in the fixed pollution source waste gas emission continuous monitoring system Based on the requirements for daily operation quality assurance, data review and processing, further regulations have been made for the technical performance of the system, monitoring station building, technical indicator debugging and testing, and technical acceptance requirements. At the same time, this standard (HJ 1286-2023) significantly improves the requirements for some acceptance indicators on the basis of the existing HJ 1013, and establishes clear technical specifications for the acceptance of online monitoring systems.

01. Technical performance requirements

The HJ 1286 standard requires accuracy: "When the reference method is used to measure the average concentration of NMHC and the emission limit value are less than 50mg/m3, the average absolute error should be within ± 10mg/m3." Compared to the HJ1013 standard, it requires higher measurement accuracy for equipment under low concentration of volatile organic compounds in exhaust gas.
Compared to the HJ 1013 standard, a new indicator requirement for system response time has been added, 'NMHC CEMS system response time ≤ 300s'

02. Requirements for monitoring station building

Compared to the HJ 75 standard, the requirements for fire prevention measures in station buildings and the installation of combustible gas alarms in station buildings have been added. Relaxed the requirement for relative humidity, which should be ≤ 85%.

03. Installation and construction requirements

Compared to the HJ 1013 standard, the HJ 1286 standard has removed the description of "or higher than the flue gas temperature of 20 ℃, whichever is higher" in the installation and construction requirements section of the sample transmission pipeline. It requires that "the transmission pipeline should have stable, uniform heating and insulation functions, and its heating temperature should be above 120 ℃. The heating temperature value should be able to be displayed and queried in the cabinet or system software.
Added the requirement that when strong corrosive gases are present in the exhaust gas, corrosive materials should be selected for the devices or pipelines through which the sample passes.

04. Technical performance indicators debugging and testing

Compared to the HJ 75 standard, analysis cycle indicators have been added and "accuracy" has been adjusted to "accuracy". HJ 1286 points out that "HJ 38 can be used as the reference method for non methane total hydrocarbons, and other national ecological environment monitoring standards can also be used.

05. Technical Index Acceptance

HJ 1286 requires that the entire gas pipeline before checking the probe, heat tracing pipeline, and analytical instrument should meet the requirement of full heat tracing without cold points.
Compared to the HJ 1013 standard, the requirement for the standard gas used for acceptance has been adjusted from the original "range standard gas using methane or propane standard gas" to "using two standard gases, methane and propane, or a mixture of both.

Compared to the HJ 75 standard, analysis cycle acceptance indicators have been added, and the acceptance report has added the requirement to provide a copy of the original chromatogram of the chromatographic analyzer for factory testing.

06. Daily operation and maintenance

Compared to the HJ 1013 standard, 10.3 safety requirements have been added, requiring operators, maintenance, and testing personnel to pay attention to and comply with some safety precautions.

07. Quality Assurance and Quality Control Requirements

Compared to the HJ 1013 standard, regular maintenance content has been added, such as "checking the consistency between the peak time and the standard spectrogram at least once a week to meet the requirements of the instrument user manual", "checking the airtightness of the combustion gas connection pipeline at least once a month, as well as the ash deposition situation of the NMHC-CEMS filter and sampling pipeline. If abnormal data is found, timely maintenance should be carried out" After replacing main components such as chromatographic columns and quantitative rings, NMHC-CEMS should be subjected to indication error detection, and calibration data and process should be recorded. The calibration data should meet the relevant requirements of Chapter 5 and be stable before it can be put into operation.