The FID total hydrocarbon analyzer is a high-precision instrument based on flame ionization detector (FID) technology, used to measure the concentration of total hydrocarbons (including methane and non methane total hydrocarbons) in gases.
The core of FID total hydrocarbon analyzer is the process of chemical ionization and ion detection. After the carrier gas containing hydrocarbons is injected into the flame of hydrogen air combustion, it will first crack and produce free radicals; Free radicals react with excited oxygen to generate positive ions such as CHO ⁺; Positive ions collide with water molecules in the flame to generate H ∝ O ⁺. Under the action of an external electric field, these positive ions and electrons will respectively move towards the two poles, forming a weak ion flow. Within a certain range, the intensity of ion flow is proportional to the mass of hydrocarbons entering the flame, which can be amplified and converted into corresponding detection signals to achieve quantitative analysis of total hydrocarbon content.
Performance Characteristics
High sensitivity and wide detection range: meet the detection needs in different scenarios.
Selective and stable response: Only shows significant response to compounds containing carbon hydrogen bonds, with poor or no response to substances such as water, carbon dioxide, hydrogen sulfide, etc., and can accurately screen target components; And the response is stable, less affected by changes in the flow rate of the carrier gas, and has good repeatability in daily testing.
Suitable for various detection scenarios: existing portable models weigh only a few hundred grams and can work continuously for more than 8 hours with hydrogen storage alloy gas cylinders, making them suitable for environmentally friendly sites; There are also online models that can be fixedly installed, equipped with heating chambers to avoid condensation of heavy hydrocarbons, suitable for continuous monitoring scenarios such as flue gas.
Main application areas
Environmental emission monitoring: It is the core equipment for waste gas emission supervision, which can be used to monitor the total hydrocarbons and non methane total hydrocarbons in industrial enterprise flue gas and waste incineration tail gas. It can also detect the concentration of oil and gas recovery systems in gas stations and oil depots, meeting the requirements of environmental emission standards.
Industrial process testing: In the petrochemical industry, it can screen for VOCs leaks from pipe valves and pump sealing points; It can also be used for online monitoring of reactor exhaust, helping to optimize the operating parameters of waste gas treatment facilities.
Special scenario detection: It can be used for the detection of hydrocarbons in the exhaust of automobiles and aviation engines, as well as for the normalized monitoring of trace total hydrocarbons in ambient air, providing data support for air quality assessment.