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In industries such as petrochemicals, steel metallurgy, and natural gas processing, the analysis of multi-component gas is crucial for ensuring process efficiency and safety. Laser Raman gas analyzer offers a cutting-edge solution for online, accurate, and comprehensive process gas monitoring, addressing the unique challenges of these industries.

Laser Raman gas analyzer is an advanced analysis instrument suitable for various complex industrial conditions. Based on the principle of laser Raman scattering, it is able to excite, collect, process and identify the characteristic Raman scattering spectrums of the measured gases to achieve qualitative and quantitative analysis of H2, O2, N2, CO, CO2, CH4, C2H2, C2H4, C2H6, C3H8, H2O, H2S, NH3, iC4, nC4 continuously and simultaneously. The response time and data refresh time are both in seconds, which enables effective process monitoring in the factory, improves production efficiency, and ensures operational safety. It requires no consumables, such as valves, ovens, columns, or carrier gases, which leads to simple operation and maintenance.

Principle of Laser Raman

Laser Raman spectroscopy is a spectral gas analysis technology based on gas Raman scattering. lt uses a high beam quality laser device to emit a specific wavelength laser light, which is focused in a gas chamber through an achromatic lens, then the laser and gas molecules collide with each other at the focal position to generate Raman scattering. The intensity of the Raman characteristic peak is proportional to the gas concentration value. By measuring and analyzing the position and intensity of the Raman characteristic peak with the spectrometer, the simultaneous measurement of multi-component gas can be realized.Since the excitation and collection of Raman scattering spectra are generated instantaneously, the time is very short and the signal collection can be performed in real time. Therefore, compared with chromatography and mass spectrometry, Raman spectrometers have a faster response speed.

Principle of Laser Raman Technology

Laser Raman Scattering Characteristic
Peaks of Common Gases

Cubic Laser Raman Gas Analyzers

Laser Raman Spectroscopy Gas Analyzer

LRGA-3100

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Laser Raman Gas Analyzer

LRGA-6000

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In-Situ Laser Raman Gas Analyzer

LRGA-3200EX

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Industrial Applications of Laser Raman Solutions

Coal Chemical

The coal chemical industry involves the process of converting coal into gas, liquid, solid fuel, and other chemicals through industrial processing. The main products include synthetic ammonia, methanol, olefins, aromatics, etc. In coal chemical applications, it is necessary to monitor multiple components: CO, H2, CO2, and CH4 for process stability; O2 and H2S for industrial safety; and fuel gas calorific value for product quality verification. Cubic laser Raman gas analyzers offer an effective solution for multi-component gas analysis in these complex coal chemical environments.

The enterprise operates a comprehensive industrial chain that converts raw coal into high-end chemical products, such as methanol. During the chemical production process, the enterprise utilizes the Cubic LRGA-3200EX to monitor toxic gases (H2S and CO) to ensure worker safety and environmental compliance, while simultaneously monitoring process gases (H2, N2, and O2) to optimize reaction conditions and maintain product quality.

H2, N2, O2, CO, CO2, CH4, H2S

The enterprise’s laboratory collects gas samples from each stage of the chemical production process for component analysis, using the laser Raman gas analyzer to measure O2, N2, H2, C3H8, C3H6, n-C4H10, i-C4H10, n-C4H8, i-C4H8, H2S, etc, supporting process optimization, product quality control, and safety assurance.

H2, N2, O2, CO, CO2, CH4, H2S

The laboratory conducts oil residue cracking experiments and monitors the gas composition changes in the reactor as temperature varies during the cracking process. Key components monitored include C3H8, C3H6, C4H10, C4H8, N2, etc. The laser Raman analyzer delivers accurate and real-time gas measurement, providing strong analytical support for the cracking process.

H2, N2, O2, CO, CO2, CH4, H2S

Petrochemical

The petrochemical industry uses petroleum and natural gas as raw materials to produce various chemical products through chemical processing, including fuels (such as gasoline, diesel), plastics, synthetic rubber, fibers, solvents, fertilizers, etc. The production process involves chemical reactions such as cracking, reforming, and polymerization. In petrochemicals, toxic, flammable and explosive gases (such as hydrogen sulfide, methane, ethylene, etc.) need to be monitored in real time to ensure industrial safety, and the main products (such as methane, and other alkanes) need to be accurately measured to optimize process parameters and improve production efficiency.

The tire pyrolysis project of an environmental protection company produces high-quality carbon black, fuel oil, and combustible gas. The company uses laser Raman gas analyzer to monitor multiple parameters: O2 concentration to ensure proper anaerobic conditions for optimal pyrolysis reactions, C5+ hydrocarbon concentrations to optimize process conditions for carbon black yield and quality, and overall gas composition to control the calorific value of combustible gas.

H2, N2, O2, CO, CO2, CH4, H2S

Natural Gas

Natural Gas serves as a critical energy source for power generation, industrial processes, residential heating, and commercial applications.Throughout the natural gas value chain, from wellhead extraction to pipeline transport to end-user delivery, natural gas analyzers provide continuous, real-time monitoring of critical components including methane, ethane, propane, butane, nitrogen, and carbon dioxide, enabling operators to optimize processing conditions, ensure product specifications, and maximize energy content for improved profitability.

As one of the largest offshore natural gas supply and oil bases in China, CNOOC undertakes the huge tasks of exploration, processing, production, and distribution of oil and gas. Accurate gas composition and heating value monitoring are critical for optimizing production efficiency, ensuring pipeline specifications, and maximizing revenue from gas sales.

H2, N2, O2, CO, CO2, CH4, H2S

The KivuWatt project is the world's first floating natural gas extraction platform on a lake. To ensure the gas meets the quality requirements of the internal combustion engines, the project uses LRGA-6000 continuous gas monitoring system to monitor CH4, CO2, H2S, O2, and N2 at three critical process stages: raw gas extraction, purified gas after treatment, and flare gas for safety management.

H2, N2, O2, CO, CO2, CH4, H2S

Acetylene (C2H2) production from natural gas (primarily CH4) is a critical industrial process, which is critical for producing acetylene used in chemical synthesis, welding, and cutting applications. The whole process demands continuous monitoring of multiple gas components, including CH4, C2H2, O2, C2H4, CO, CO2, and N2, to optimize conversion rates, ensure safe operation, and maintain acetylene purity specifications.

H2, N2, O2, CO, CO2, CH4, H2S

Metallurgical

The metallurgical industry encompasses critical processes for extracting, refining, and shaping metals, including iron making, steel production, casting, heat treatment, sintering, and pelletizing. Gas monitoring during metallurgical processes is essential for process efficiency, operational safety, and environmental compliance. Cubic Laser Raman gas analyzers enable accurate and simultaneous measurement of multiple gases under high-temperature and harsh conditions typical of metallurgical processes.