1、 Installation specifications: explosion-proof, shockproof, precise layout

Explosion-proof requirements

Equipment selection: Explosion proof infrared methane analyzer must be selected, suitable for explosive gas environments such as coal mines and chemical industries.

Wiring specifications:

Explosion proof steel pipes should be used for on-site wiring, and the connection between the pipe and the probe should be sealed to prevent the infiltration of flammable gases.

The power cord should be independent of large motor equipment to avoid electromagnetic interference; The grounding resistance should be ≤ 4 Ω to ensure reliable grounding of the casing or power plug ground wire.

Installation location:

It is prohibited to install in enclosed spaces in explosion-proof areas. It is necessary to choose a well ventilated area and be at least 1 meter away from the interference source.

When installing outdoors, it is necessary to install a rain cover to prevent rainwater and snow from corroding the equipment.

environmental adaptability

Temperature control: The equipment should avoid exposure to environments below -20 ℃ or above 50 ℃. If necessary, a temperature control box or device should be installed.

Earthquake prevention measures: In industrial scenarios with high vibration, it is necessary to fix equipment and install shock-absorbing brackets to prevent sensor damage or fluctuation of detection data.

Clean power supply: Choose a relatively clean power supply to avoid sharing the same circuit with high-frequency interference equipment.

Maintenance and Calibration

Regular calibration: The probe should be calibrated at least once a year to ensure detection accuracy; Zero calibration is performed weekly or monthly, and range calibration is performed quarterly using standard methane gas calibration.

Easy to operate: The installation location should consider maintenance convenience, such as reserving maintenance space, setting calibration interfaces, etc.

2、 Gas path pretreatment plan: dry, clean, and stable gas supply

Preprocessing objectives

Remove moisture, dust, and corrosive gases from the sample gas to prevent sensor poisoning or gas path blockage.

Ensure that the temperature, pressure, and flow rate of the sample gas are stable and meet the requirements of the analyzer.

Composition of pre-processing system

Primary cooling dehydration:

Solution: Add a vortex tube cooler and use compressed air for cooling. The cold air and hot sample gas exchange heat through a jacket heat exchanger to reduce the sample gas temperature to 5-10 ℃.

Advantages: No need for electric drive, suitable for high-risk environments without stable power supply; High cooling efficiency and effective removal of moisture.

Secondary filtration purification:

Mechanical impurity filter: Filter out particles with a diameter ≥ 0.1 μ m to protect subsequent equipment.

Chemical filter: filled with activated carbon or specialized adsorbent to remove low concentration corrosive gases.

Drying machine: equipped with silica gel or molecular sieve to further dry the sample gas.

Flow control:

Use a rotary flow meter or mass flow meter to ensure that the sample gas flow rate is stable at the recommended value of the equipment and avoid flow fluctuations affecting the detection results.

Key points for implementing pre-processing system

Material selection: Each component of the pretreatment device should be made of corrosion-resistant materials that are suitable for harsh environments such as chemical and coal mines.

Layout optimization: The preprocessing device should be located as close as possible to the sampling point to reduce the sample gas transmission time; The connection between each component is tight to prevent air leakage.

Maintenance management: Regularly replace filter cartridges, desiccants, and clean air path blockages; Check the discharge of condensate water to ensure the normal operation of the system.