The CMS-6000 online monitoring system for volatile organic compounds (VOCs) in flue gas is developed by PuruiinstrumentThe developed online monitoring equipment for VOCs in flue gas can measure various organic compounds such as total hydrocarbons (THC), methane (CH4), non methane total hydrocarbons (NMHC), and benzene derivatives (BETX). This system can be widely used for monitoring VOCs emissions from various industrial pollution sources, such as semiconductors, electronics, pharmaceuticals, petrochemicals, chemicals, printing, automobiles, coatings, rubber, and other industries. It has stable and reliable performance and high integration. At the same time, in response to various working conditions and customer needs, Purui can providecustomized.

Performance advantages of CMS-6000 Purui flue gas volatile organic compounds (VOCs):

The analysis method adoptsGC-FID method, in compliance with national standard method HJ/T 38-1999 and US EPA standards;

OptionalVarious detectors such as ECD, FPD, TCD, etc. are used to meet the needs of different sensitivities and detected substances;

The system has high detection sensitivity and can automatically switch between high and low ranges. Each target analyte has an independent detection limit;

The standard analysis time is1 minute, can provide real-time and continuous monitoring data;

High degree of automation, capable of automatic pipeline cleaning, with minimal instrument maintenance workload;

Real time capability/Timer system diagnosis and fault alarm function;

Built in calibration module, adjustable calibration cycle, can achieve automatic quality control of the instrument;

The FID detector has an automatic ignition function, which automatically shuts off the gas system after the flame is extinguished to ensure system safety;

Built in integrated industrial computer, high-definition color LCD touch screen display, system software adopts layered modular design, and the operating interface is simple and easy to control;

Real time display of the operating status of various components in the system, and setting of instrument parameters for easy maintenance;

Can view real-time/Historical monitoring data, automatically storing data and graphs, and providing multiple report formats for selection;

haveMultiple data transmission methods such as RS232/485, RJ45, USB, etc. can achieve real-time data communication and connect to the monitoring platform of the environmental protection department;

Equipped with operation permission restrictions and password control functions to prevent operational errors or unauthorized operations;

We can provide customized solutions based on customer needs, including explosion-proof cabinet type, full process high-temperature tracing type, and mobile monitoring vehicle type

System Group

System component one: CMS6000 series online process gas chromatograph

The main component of the VOCs organic pollutant online monitoring system is to analyze the collected organic waste gas, calculate the composition and content of VOCs substances, and provide practical data basis for the treatment and emission of VOCs in enterprises.

System component 2: Temperature pressure flow module

The temperature pressure flow is connected to the sampling probe to heat, stabilize, and preprocess the collected gas. It is equipped with a shut-off valve and a blowback solenoid valve to ensure smooth delivery of the collected gasImprove the accuracy of data monitoring in the VOCs organic pollutant online monitoring system.

System Component Three: Hydrogen/Air Generator

The online series hydrogen generator provides high-purity hydrogen gas for the VOCs organic pollutant online monitoring system. It uses potassium hydroxide solution as the electrolyte and has the advantages of safe use and easy maintenance. It can be replaced by high-purity hydrogen gas cylinders.

Zero level air generator: composed of silent, oil-free compressor, stainless steel gas tank, high-temperature catalytic oxidation furnace, two-stage drying tube and other gas circuits. Equipped with automatic adsorption to remove hydrocarbon substances from the air, providing oil-free three-stage purified air for the system

System Component 4: Integrated Sampling Probe for Heat Tracing and Filtering

The specially designed integrated sampling probe for heat tracing and filtration, due to the different composition of VOCs organic waste gas in different industries, some waste gases contain water vapor or smoke, which can affect the experimental results. A specially designed sampling probe for this situation, equipped with a built-in filtering system and heat tracing system, filters the collected gas and simultaneously conducts 80 ℃ high-temperature heat tracing, allowing the collected exhaust gas to smoothly enter the temperature pressure flow module.

System Component 5: Data Acquisition and Transmission Device

The data acquisition and transmission device stores the test data and operating status of the VOCs online monitoring system through digital channels, analog channels, and switch channels, and uploads the data information to the VOCs online data monitoring platform through the system's built-in 4G wireless network module. The monitoring platform can transmit control commands to the data acquisition and transmission device through the 4G network, and the data acquisition and transmission device controls the operation of the VOCs online monitoring system based on the received control commands.

System Component 6: 4G Wireless Network Module

Due to environmental limitations, some locations are unable to install wired networks for the installation of VOCs organic pollutant online monitoring systems. Therefore, a separate 4G wireless network module is configured to allow the VOCs online monitoring system to exchange data with the VOCs monitoring platform through the 4G wireless network, making it more convenient to set up monitoring networks in multiple locations.

If the environment allows, the 4G module can be replaced with a wired network, which has better data transmission stability than the 4G module.

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The Ministry of Ecology and Environment has released the "Technical Guidelines for Continuous Monitoring of Non Methane Total Hydrocarbon Emissions in Fixed Pollution Source Waste Gas"(Trial)

Introduction: In order to standardize the installation, operation, maintenance and management of automatic monitoring facilities for volatile organic compounds in pollution sources, the Ministry of Ecology and Environment recently issued the "Technical Guidelines for Continuous Monitoring of Non Methane Total Hydrocarbon Emissions in Fixed Pollution Source Waste Gas"(Trial) ", which includes installation and construction requirements, operation management, and data review and processing.
In order to standardize the installation, operation, maintenance and management of automatic monitoring facilities for volatile organic compounds in pollution sources, the Ministry of Ecology and Environment recently issued the "Technical Guidelines for Continuous Monitoring of Non Methane Total Hydrocarbon Emissions in Fixed Pollution Source Waste Gas"(Trial) ", details are as follows:
To implement the Notice on Strengthening the Construction of Automatic Monitoring for Key Polluting UnitsAccording to the requirements of the Environmental Office and Environmental Supervision [2018] No. 25, the installation, operation, maintenance, and management of automatic monitoring facilities for volatile organic compounds in pollution sources are standardized. Our department has organized the development of the "Technical Guidelines for Continuous Monitoring of Non Methane Total Hydrocarbon Emissions in Fixed Pollution Source Waste Gas (Trial)". We are now issuing it to you for your compliance and execution.

Guidelines for Continuous Monitoring of Non Methane Total Hydrocarbon Emissions from Fixed Pollution Source Waste Gas(Trial)

To standardize the use of hydrogen flame ionization detectorsThis guideline is formulated for the construction, operation, and management of a continuous monitoring system for non methane total hydrocarbons in fixed pollution source exhaust gas (i.e. FID).

1、 Installation and construction requirements

　　（1） System composition

Continuous monitoring system for non methane total hydrocarbons from fixed pollution sourcesNMHC-CEMS (hereinafter referred to as NMHC-CEMS) consists of a non methane total hydrocarbon monitoring unit, a flue gas parameter monitoring unit, and a data acquisition and processing unit.

　　NMHC-CEMS should be able to measure the concentration of non methane total hydrocarbons in flue gas, flue gas parameters (temperature, pressure, flow rate or flow rate, humidity, etc.), calculate the emission rate and amount of pollutants in exhaust gas, display (can support printing) and record various data and parameters, form relevant charts, and transmit them to management departments through data, graphics, and other methods.

EnterThe NMHC-CEMS combustion (incineration, oxidation) device requires supplementary air for combustion and oxidation reactions of exhaust gas, and should also meet the requirement of simultaneously measuring oxygen content. If the oxygen content is involved in the calculation of pollutant conversion concentration, it should be converted to the baseline emission concentration of atmospheric pollutants according to the emission standards. For the incineration of organic waste gas using boilers, industrial furnaces, and solid waste incinerators, the standard oxygen content of the flue gas shall be implemented according to its emission standards.

　　（2） Technical performance requirements

Meet the technical requirements and detection methods for continuous monitoring system of non methane total hydrocarbons in fixed pollution source exhaust gasTechnical requirements in HJ 1013.

　　（3） Requirements for monitoring station building

Meet the requirements of 'Fixed Pollution Source Smoke'The Technical Specification for Continuous Monitoring of SO2, NOx, and Particulate Matter Emissions (HJ 75) specifies the requirements for monitoring station buildings with continuous monitoring systems for fixed pollution source flue gas emissions.

If hydrogen gas cylinders are used as the working gas source, hydrogen alarms should be installed in the monitoring station building, and significant fire prevention signs should be posted outside the station building. At the same time, in accordance with the "Explosive Environment auxiliary word for ordinal numbersPart 1: General Requirements for Equipment "(GB 3836.1) stipulates the provision of explosion-proof and other safety facilities.

　　（4） Installation location requirements

SatisfyRequirements for the installation location of continuous monitoring systems for fixed pollution source flue gas emissions in HJ 75.

When setting up a sampling or monitoring platform, it should be easy for personnel and monitoring instruments to reach. When the sampling platform is set at a height above the groundWhen the distance is ≥ 2m, there should be an inclined ladder leading to the platform, with a width of ≥ 0.9m. If conditions permit, spiral ladders, Z-shaped ladders, or elevators can be used.

　　（5） Installation and construction requirements

SatisfyHJ 75 specifies the installation and construction requirements for continuous monitoring systems for fixed pollution source flue gas emissions.

When the exhaust gas emitted from a fixed pollution source contains highly corrosive gases, corrosion-resistant materials should be selected for the devices or pipelines through which the sample passes. The shell or outer cover of outdoor components should also meet at least the "Shell Protection Level"IP55 protection level requirements in GB/T 4208 (IP Code). The sample transmission pipeline should have stable, uniform heating and insulation functions, and its heating temperature should comply with relevant regulations. The heating temperature value should be able to be displayed and queried in the cabinet or system software.

2、 Operation management

　　（1） Operations personnel

　　The NMHC-CEMS operation and maintenance unit should prepare instrument operation management procedures based on the NMHC-CEMS user manual and technical requirements, and determine the job responsibilities of system operation and maintenance personnel. Operations personnel should be proficient in the principles, usage, and maintenance methods of NMHC-CEMS.

　　（2） Inspection and maintenance

　　The daily operation management of NMHC-CEMS should include routine inspections and maintenance, and should meet the relevant requirements of HJ 75 for routine inspections and maintenance. Operations personnel should carry out regular maintenance of NMHC-CEMS to ensure its normal operation.

According toMake regular maintenance records in the form of a table in Appendix G of HJ 75. Regular maintenance should achieve:

　　For those who use hydrogen gas cylinders, the pressure of the cylinder gas should be inspected and recorded every week. If conditions permit, one should be used and the other should be prepared;

　　2. Check the discoloration of the hydrogen generator's silicone gel at least once a month, and replace it if more than 2/3 of the discoloration occurs;

　　3. For those who use a hydrogen generator, the hydrogen pressure and electrolyte of the hydrogen generator should be checked regularly according to its instructions, replaced in a timely manner according to usage, and purified water should be added regularly;

　　4. Check at least once a week whether the temperature of the hydrocarbon removal device remains above 350 ℃;

　　5. Check the consistency between the peak time and the standard spectrum at least once a week to ensure it meets the requirements of the instrument manual;

　　6. Check the airtightness of the combustion gas connection pipeline at least once a month, as well as the ash deposition of the NMHC-CEMS filter and sampling pipeline. If any abnormal data is found, timely maintenance should be carried out;

　　7. Check the activated carbon and nitric oxide oxidant in the zero gas generator at least once every six months, and replace them according to usage;

　　8. NMHC-CEMS using catalytic oxidation equipment shall be tested for conversion efficiency once a year with propane standard gas to ensure that the propane conversion efficiency is above 90%. Otherwise, the catalytic oxidation equipment shall be replaced;

　　When replacing main components such as chromatography columns and quantitative rings, the analyzer should be calibrated at multiple points and the calibration data and process should be recorded. The calibration data must meet technical requirements and be stable before it can be put into operation.

　　（3） Regular calibration

Regular calibration should meet the requirementsThe relevant requirements for regular calibration in HJ 75. Fill in the periodic calibration records in the form of the table in Appendix G of HJ 75.

　　（4） Quality Assurance

Daily operation quality assurance is the guaranteeNMHC-CEMS operates normally and stably, providing necessary means for continuous quality assurance monitoring data. When NMHC-CEMS fails to meet technical specifications and loses control, corrective measures should be taken in a timely manner, and the interval between the next calibration, maintenance, and verification should be shortened.

　　（5） Other

Considering that there are many flammable and explosive situations involving non methane total hydrocarbon emissions on site, safety production requirements should be followed in daily operation and management.

Common fault analysis and troubleshooting should meet the requirementsRequirements for common fault analysis and troubleshooting in HJ 75.

3、 Data review and processing

　　（1） Data review

ReferenceConduct data review for the Continuous Emission Monitoring System (CEMS) in HJ 75, and process invalid time periods according to the relevant requirements of CEMS data invalid time periods.

　　（2） Data recording and reporting

ReferenceRecord monitoring results in the form of tables such as HJ 75 Appendix D and HJ 1013 Appendix A. According to relevant management requirements, regularly report NMHC-CEMS monitoring data to the Key Pollution Source Automatic Monitoring and Basic Database System. The report should provide relevant information such as * value, * minimum value, average value, cumulative emissions, and the number of samples involved in statistics.

4、 Other

Systems that use other methods of measurement can refer to this technical guide for implementation. Specific requirements for technical performance, monitoring station building, system installation, calibration and maintenance will be specified in relevant standards and specifications.

Update time: September 4, 2020 16:48:45