Detailed Description

1.Product overview:

This is a monitoring technology that uses full-process high-temperature thermal wet sampling. It is configured based on advanced gas chromatography separation technology and FID detection method (GC-FID) to measure total hydrocarbons (THC) and non-methane total hydrocarbons (NMHC) in exhaust gas., benzene series, aromatic hydrocarbons, esters and other volatile organic gases, and transmits the measurement data to the environmental protection department remotely. The internal sampling, injection and detection systems of the instrument all adopt high-temperature heat tracing methods, which is conducive to accurate measurement of high-concentration and high-boiling samples. For complex field application conditions, it adopts a structure that is easy to explosion-proof design to meet the monitoring needs of many industries such as petrochemical, pharmaceutical, automobile manufacturing, furniture manufacturing, semiconductor manufacturing, printing, and spraying. According to different monitoring requirements, this instrument has different customized ranges are available to meet the monitoring needs of different users for VOCs.

2.System composition

• Sample collection and extraction section: heating sampling probe, sample heat tracing transmission pipeline, sample pretreatment unit (filtering, stabilizing flow), sampling pump, etc.
• Sample analysis and testing section: Gas chromatograph (GC-FID).
• Other auxiliary testing parts: whole system calibration unit, exhaust emission unit, backflow control unit, generator discharge unit.
• Smoke emission parameter monitoring subsystem: The smoke temperature is measured using thermocouples or thermal resistors; The smoke pressure is measured using a pressure sensor; The flow rate or velocity of flue gas shall be measured using Pitot tubes and ultrasonic methods; Dry wet oxygen method for flue gas moisture content.
• Data collection, processing and transmission part: collection, storage, recording, calculation and processing of sampling and testing data and system status parameters, as well as data uploading.

3.Data acquisition and processing subsystem

The continuous monitoring system for VOCs emissions from fixed pollution sources is an industrial computer that automatically collects, analyzes and processes monitoring data. The test results can be automatically uploaded to the enterprise DCS control system through a network connection to deliver test result data and alarm information to the enterprise’s internal DCS, and On-site data signals can be transmitted to the corresponding environmental protection supervision department via wireless or wired means.

VOCs CEMS operating software specially developed according to environmental protection laws and regulations, mainly including: data collection; Data processing; Data storage; Data display; Bar chart display; Sampling trend chart; Data printing: generate daily, monthly, quarterly, and annual reports; System operation: calibration, blowback, alarm, self check; Security and confidentiality of data; Data transmission; Data loss handling.

4.System characteristics

• The pre-treatment method complies with the measurement standards for fixed pollution source exhaust gases in the United States, the European Union, and China, and has high reliability;
• The system adopts the total heat method, with high temperature throughout the entire process from sampling to analysis, without the need for water removal; Unique insulation box design, the temperature of the sample gas outlet pipe wall can reach 120 ℃ -150 ℃, effectively avoiding sample loss;
• Flow path balance atmospheric pressure technology ensures the accuracy of detection results under different sample pressure conditions;
• Pre pumping circuit design, with a cyclic response period of ≤ 3 minutes, ensuring real-time and effective detection results;
• Equipped with automatic blowing function, it can automatically remove dust on the surface of the probe filter element, extending the service life of the probe;
• Equipped with full flow and automatic calibration functions, it meets the latest 1013 standard requirements for sampling full flow calibration; The chromatograph supports full automatic calibration without the need for on duty, minimizing manual maintenance;
• Using air as the carrier gas, there is no need to configure nitrogen cylinders, reducing maintenance costs by about tens of thousands of yuan annually;
• Users can choose explosion-proof design, adopting positive pressure explosion-proof cabinet design, which can be installed in explosion-proof areas, safe and reliable;
• Equipped with chromatographic injection backflushing function, it can avoid interference caused by residual sample gas and ensure the accuracy of analytical data.

5.Main uses and scope of application

Suitable for online continuous monitoring of VOCs concentration in fixed pollution sources in industries such as furniture, printing, automotive, leather, coatings, and petroleum.

The measurement objects are volatile organic compounds (VOCs, substances that are liquid at room temperature, solvents), such as gasoline, kerosene, light oil and other fuel oils, diluents, benzene, toluene, xylene, ethylbenzene, dichloromethane, trichloroethylene, tetrachloroethylene, alcohols, ethers, esters, aldehydes and ketones, amines, amides, NMP, nitriles, organic acids, organic silicon solvents (siloxanes), CFCs (fluorocarbons), and almost all organic solvent vapors.