According to research reports, about 35% of global CO2 emissions mainly come from the electricity and heating industry. As the implementation of my country's dual carbon goals enters a new stage,
In order to further improve the data accuracy of carbon verification, it is necessary to measure the CO2 concentration and flue gas flow in the flue at the same time. Currently, the flue concentration measurement has high accuracy (RSD is about 1%~5%), while the flue gas flow The measurement accuracy is often low (RSD is about 3%~50%). Due to the large diameter of the flue, high temperature, high humidity, complex flow, and high turbulence, it is difficult to achieve accurate measurement with conventional methods. Therefore, it is crucial to select appropriate detection technology and flow meters for emission measurement of chimney or flue gases. important.
The project is located in a large cement manufacturing enterprise in Shiyan, Hubei Province. The enterprise has a 10MW pure low-temperature waste heat power generation system that can use waste heat to generate 73.5 million kW‧h of electricity every year. Ruiyi Auto-Control and its "Fixed Pollution Source Emission Test Project" set up a pilot project at the chimney of the power generation system in the factory to jointly promote the development of accurate carbon monitoring.
Product prototype.
Ultrasonic flow meter Gasboard-7900：

Gasboard-7900 is a high temperature ultrasonic flow meter. The product is based on the principle of ultrasonic waves. It uses one or more pairs of ultrasonic transceiver devices to be installed and measured in the downstream and counter-flow directions of the medium. It calculates the flow rate of the gas in the flue through the propagation time difference of the ultrasonic waves, and calculates the flow rate of the flue gas based on the cross-sectional area of the flue. Volume flow. This flow meter adopts a non-contact measurement method, which can effectively solve the common measurement difficulties such as unstable flow field and uneven flow velocity distribution in pipelines. It can maintain continuity in the harsh environment of high temperature, high humidity and high dust in the flue gas emission process. Real-time stability monitoring.

Product Features:
1. Suitable for flow measurement of acidic and water-containing gases, and is not affected by changes in gas components.
2. The measuring aperture range is large, supporting the aperture range of 0.3-12m.
3. It can measure lower flow speeds, and the lower limit of measurement can reach 0.1m/s.
4. It can be flexibly configured according to needs, and one or more pairs of ultrasonic transceiver devices can be used for measurement.
5. The parts of the whole machine that are in contact with the gas are made of corrosion-resistant materials and can be used under high-temperature corrosive flue gas conditions.
6. It adopts a high-speed data processor, has fast running speed, and has functions such as calibration, configuration, query, and diagnosis, and has rich external interfaces.
The main parameters:
Applicable media: air, flue gas and other non-combustible gases
Applicable pipe diameter 0.3~12 (m)
Number of channels: Mono (2, 4 multi-channels can be customized)
Flue gas pressure range -10~10 (kPa)
Flue gas temperature range -20~480 (°C)
Flue gas flow rate range 0~40 (m/s)
Accuracy level 2.0
Host working environment temperature -20~60 (°C)
Working voltage AC 220V± 10% Frequency: 50/60Hz
Rated power 100W (host)
Output signal 4~20mA, RS-485
Protection class IP65.

Project implementation technical plan:

Based on the monitoring advantages of ultrasonic technology, the Gasboard-7900 series of high-temperature ultrasonic flow meters use one or more pairs of ultrasonic transceivers to install and measure in the downstream and counter-flow directions of the medium. The flow rate of the gas in the flue is calculated through the propagation time difference of the ultrasonic waves, and combined with the smoke Calculate the volumetric flow rate of flue gas from the cross-sectional area of the channel. This flowmeter adopts a non-contact measurement method, which can effectively solve the measurement difficulties such as unstable flow field and uneven flow velocity distribution that are common in pipelines. It can maintain continuous real-time in the harsh environment of high temperature, high humidity and high dust in the flue gas emission process. stable monitoring. It is suitable for flow rate and flow monitoring of pollution source discharge outlets in industries such as petroleum, coal, electricity, natural gas, steel, building materials, chemicals, petrochemicals, textiles, non-ferrous metals, and waste incineration.

Technological innovation continues in all aspects of world steel production. As a link in steel production, heating furnaces also have many technologies that need to be improved and upgraded. Combustion control is an important part of the automatic control of the heating furnace, and the key to combustion control is accurate air-fuel ratio control. Therefore, the introduction of a gas calorific value meter into the heating furnace online combustion automatic control system will improve the accuracy of the air-fuel ratio of the heating furnace, which will be of great significance for ensuring the quality of billet heating and energy saving and emission reduction in this link.
Project Introduction:
The customer of this project is the hot rolling mill of Wuhan Iron and Steel Group. There are 7 heating furnaces on site with an annual output of tens of millions of tons of steel billets. The project site needs to equip the heating furnace with calorific value detection equipment to improve the heating quality of the billet and reduce the oxidation and burning loss of the billet by improving the accuracy of the air-fuel ratio. Because the original infrared calorific value meter was aging and operating abnormally, new equipment needed to be purchased to replace it. According to the on-site explosion-proof requirements, all the equipment in the explosion-proof cabin built 11 years ago is now aging and operating abnormally. Moreover, because the gas used on site is a high-coke mixed gas, the pretreatment was not done properly, resulting in the equipment being out of service.
Product prototype:
Laser Raman spectroscopy gas analyzer (explosion-proof type) LRGA-6000:

The Laser Raman Spectroscopic Gas Analyzer LRGA-6000 is based on the principle of laser Raman scattering. It enhances, collects, processes and identifies the specially designed Raman scattering spectrum of the gas to be measured, and performs quantitative calculation of the content. It can conduct full-scale online and real-time detection of multiple gases at the same time.
Product Features:
1. Using laser Raman gas signature fingerprint technology with less interference
2. Online and real-time: One instrument solves the entire process monitoring of industrial process gases
3. Full components: measure gas components and calorific values including CO, CO2, H2, O2, CH4, N2, and CnHm
4. The response speed is fast, and the measurement results are directly displayed after the sample gas enters the analyzer.
5. Full range gas concentration measurement, the detection range is (0.01-100)%, adjust the time, and can also measure trace components
6. With automatic temperature and pressure correction function, no drift
7. Low cost of use and maintenance, no need for carrier gas and consumables
8. Optional integrated system for real-time cycle monitoring of multiple monitoring points
9. Intelligent software design, full touch screen interface, intuitive data display, and can be connected to an external PC keyboard

The main parameters:
Measuring range: lowest measuring range: (0~10)%, highest measuring range: (0-100)%
Linear error ≤2%F.S.
Resolution 0.01%
Instrument response time ≤90s
Drift ≤2%F.S./24h
*Please refer to the specifications for specific parameters. For more technical information, please contact: 027-81628829 or info@gasanalyzer.com.cn
Project implementation
Technical solutions

Analyzed components Minimum value (Min) Normal value (Typical) Range value (Max)
CO2 0 12.00% 0-30%
CO 0 18.00% 0-40%
H2 0 27.00% 0-70%
N2 0 31.00% 0-60%
CH4 0 10.00% 0-30%
CnHm 0 0.70% 0-5%
O2 0 0.90% 0-20%
MJ/m3 - - -

The laser Raman online explosion-proof analysis system is mainly composed of three parts: a preprocessing unit, a control unit, and an analysis unit. It is specially designed for medium and low dust working environments. The product is controlled by PLC program, which can automatically switch between 3 sampling channels and achieve 24-hour unattended operation. It greatly reduces the manual load, ensures the long-term stability of the system, and achieves accurate and continuous automatic online operation.
1. Pretreatment device
The pretreatment device realizes three-channel cyclic switching of gas sampling by controlling the air inlet solenoid valve. In the process of gas purification and purification, a gas-water separator with a filtration accuracy of 5um is used to separate liquid water from the sample gas and filter the sample gas at the same time; the initially filtered gas passes through the semiconductor condenser to remove solidifiable solids from the sample gas. Gaseous water. The filters used in the entire process are equipped with automatic drainage devices to ensure that the system automatically completes the normal sampling and drainage process. Finally, a precision filter with a filtration accuracy of 0.1um is used to ensure that the sample gas meets the usage requirements of the analytical instrument, ensuring the accuracy of the monitoring data and the reliability of the system.
2. Control unit
The Laser Raman Gas Analyzer displays all data in real time via custom operating software on the built-in IPC and provides real-time data output via the MODBUSTCP protocol and a 4-20mA analog output for each gas component.
3. Analysis unit
The analysis unit is a multi-component laser Raman analyzer with independent intellectual property rights owned by Hubei Ruiyi. It uses laser Raman gas characteristic fingerprint spectroscopy technology to enhance, collect, process and identify the characteristic Raman scattering spectrum of the gas to be measured, and can quantitatively calculate gas components and achieve online and real-time qualitative and quantitative monitoring of multiple types of gases. , ensuring the long-term and stable automatic online operation of the KivuWatt project.
Solution value:
This project uses our laser Raman calorific value analyzer to monitor the gas component concentration and calorific value during the production process of the heating furnace. Provide data support for accurate calculation of air-fuel ratio to improve fuel combustion efficiency, reduce exhaust smoke volume and exhaust heat loss, and reduce heating furnace shutdown time and frequency. Thereby improving the operating rate of the heating furnace, which is of positive significance in ensuring the quality of billet heating and energy saving and emission reduction in this link.
After actual performance verification and strict test evaluation at the heating furnace heating value of Wuhan Iron and Steel Hot Rolling Plant, Hubei Ruiyi Laser Raman Heat Value Analyzer has been highly recognized by expert leaders of Wuhan Iron and Steel Research Institute, and will be prioritized in other six applications in the future. In the monitoring work of the heating furnace production line, the application of heating furnace calorific value meters will be comprehensively promoted to steel plants across the country in the future.

The project site:

Lake Kivu in Rwanda is known as one of the "Great Lakes of Africa". There are large amounts of dissolved methane (CH4) and carbon dioxide (CO2) in the stratified deep water area (less than 250 meters). Methane concentrations as high as about 20 mmol/l are sufficient For commercial gas extraction and power generation. ContourGlobal will implement a power generation plan on Lake Kivu, using the high concentration of methane gas found in the deep waters of Lake Kivu to generate electricity. This project is called the KivuWatt project.
The KivuWatt project is the world's first natural gas extraction platform floating in the lake. In order to safely extract methane from Lake Kivu, the natural gas extraction facility is located 13 kilometers away from the lake shore and connected to the bottom of the lake. The project draws water from a depth of 350 meters. The gas extraction process passes through a gas separator to extract bubbles containing CH4 from the carrier gas water with a pressure of 35-2bar, and then washes the original gas in four scrubbers, ultimately producing clean, high-concentration methane. The gas is transported through a 13-kilometer-long semi-submerged pipeline to a 26-megawatt power plant on the lake shore. The large internal combustion generator set in the power plant converts biogas energy into electrical energy to provide necessary power for Rwanda's national public power system. Carbon dioxide is pumped back into the lake to maintain the delicate balance in the lake.

Schematic diagram of the stratified deep water area of Lake Kivu:



Project Introduction:
In order to ensure that the gas delivered to the power plant meets the gas quality requirements of the internal combustion engine, the Rwanda KivuWatt project requires the installation of a long-term continuous operation biogas monitoring system on the gas extraction platform to monitor natural gas quality data from 3 different process points. : Original gas, purified gas, and torch gas.
In order to accurately detect gas components, the project needs to directly measure the components of the original gas, including methane, carbon dioxide, hydrogen sulfide, O2 and N2. Among them, in order to ensure the quality of the raw gas, N2 must be directly measured and cannot be calculated; and it needs real-time online continuous monitoring to ensure the normal operation of the process and minimize the losses caused by maintenance cycles and shutdowns to achieve optimal production. efficiency.
In order to achieve the above monitoring purposes, after comparing different technical routes and different supplier solutions, the KivuWatt project finally adopted a laser Raman online explosion-proof analysis system to provide high-precision, low-maintenance real-time monitoring.
Rwanda KivuWatt project diagram
Product prototype:
Laser Raman spectroscopy gas analyzer (explosion-proof type) LRGA-6000:





The Laser Raman Spectroscopic Gas Analyzer LRGA-6000 is based on the principle of laser Raman scattering. It enhances, collects, processes and identifies the specially designed Raman scattering spectrum of the gas to be measured, and performs quantitative calculation of the content. It can conduct full-scale online and real-time detection of multiple gases at the same time.
Product Features:
1. Using laser Raman gas signature fingerprint technology with less interference
2. Online and real-time: One instrument solves the entire process monitoring of industrial process gases
3. Full components: measure gas components including CH4, CO2, H2S, N2, O2, H2O
4. The response speed is fast, and the measurement results are directly displayed after the sample gas enters the analyzer.
5. Full range gas concentration measurement, the detection range is (0.01-100)%, adjust the time, and can also measure trace components
6. With automatic temperature and pressure correction function, no drift
7. Low cost of use and maintenance, no need for carrier gas and consumables
8. Optional integrated system for real-time cycle monitoring of multiple monitoring points
9. Intelligent software design, full touch screen interface, intuitive data display, and can be connected to an external PC keyboard
Project implementation technical plan:
The laser Raman online explosion-proof analysis system is mainly composed of three parts: a preprocessing unit, a control unit, and an analysis unit. It is specially designed for medium and low dust working environments. The product is controlled by PLC program, which can automatically switch between 3 sampling channels and achieve 24-hour unattended operation. It greatly reduces the manual load, ensures the long-term stability of the system, and achieves accurate and continuous automatic online operation.
1. Pretreatment device
The pretreatment device realizes three-channel cyclic switching of gas sampling by controlling the air inlet solenoid valve. In the process of gas purification and purification, a gas-water separator with a filtration accuracy of 5um is used to separate liquid water from the sample gas and filter the sample gas at the same time; the initially filtered gas passes through the semiconductor condenser to remove solidifiable solids from the sample gas. Gaseous water. The filters used in the entire process are equipped with automatic drainage devices to ensure that the system automatically completes the normal sampling and drainage process. Finally, a precision filter with a filtration accuracy of 0.1um is used to ensure that the sample gas meets the usage requirements of the analytical instrument, ensuring the accuracy of the monitoring data and the reliability of the system.
2. Control unit
The Laser Raman Gas Analyzer displays all data in real time via custom operating software on the built-in IPC and provides real-time data output via the MODBUSTCP protocol and a 4-20mA analog output for each gas component.
3. Analysis unit
The analysis unit is a multi-component laser Raman analyzer, which uses laser Raman gas characteristic fingerprint spectroscopy technology to enhance, collect, process and identify the characteristic Raman scattering spectrum of the gas to be measured, and can perform quantitative calculations on gas components to achieve Conduct qualitative and quantitative monitoring of multiple types of gases online in real time to ensure the long-term and stable automatic online operation of the KivuWatt project.
Solution value
The laser Raman spectroscopic gas analyzer can not only complete the monitoring needs of major components such as CH4, CO2, H2S, but also directly and accurately measure N2 concentration, and provides high-precision and long-life H2S measurement, perfectly solving customers' pain points. This solution integrates the instrument into a positive pressure explosion-proof cabinet, which is fully suitable for use in hazardous scenarios. After actual performance verification and rigorous testing and evaluation at the Rwanda biogas site, the laser Raman gas analyzer was approved by the project evaluation team and will be prioritized for use in other biogas power plant projects to be constructed by this customer in the future.

The project site:

A steel plant project uses pulverized coal gasification direct reduction iron technology to directly reduce blast furnace iron ore, reduce ironmaking energy consumption, improve efficiency and economic benefits, and reduce carbon emissions.
The steel plant needs to pass reducing gas into the blast furnace to achieve direct reduction of pellets, saving fuel and carbon emissions. Therefore, the gas production quality of the gasifier is closely related to production efficiency, and has high requirements for the response speed and accuracy of gas analysis. .
The GasTDL-3100 series laser gas analyzer provided by our company can analyze the concentration and calorific value of each component of on-site gas in real time, with a response speed of ≤1s, providing a perfect solution for customers on-site.
Product prototype
In-situ laser process gas analyzer GasTDL-3100:



GasTDL-3100 in-situ laser process gas analyzer is a high-performance optical analysis instrument based on tunable semiconductor laser absorption spectroscopy (TDLAS). It adopts a through-beam design and can be used for industrial process gas control; its response time is fast and it can be used in-situ In type measurement, it is generally calculated in seconds to avoid the time delay caused by sampling measurement, and can respond to the measured gas concentration online and in a timely manner.
Product Features:
1. Using TDLAS technology, the measured gas is not subject to cross-interference by background gas
2. In-situ installation, no sampling pre-treatment system required
3. Fast response (T90≤1s), can respond to gas concentration in real time
4. Real-time online measurement, gas concentration is not easily distorted, and measurement accuracy is high
5. It has good adaptability in harsh measurement environments such as high temperature, high dust, high moisture, high corrosivity, and high flow rate.
6. Explosion-proof and explosion-proof design, high safety factor
7. Simple structure, no moving components, no loss components, maintenance-free

The main parameters:
Measurement components CO/CO2, CH4, O2
Measurement principle CO/CO2, CH4, O2: TDL
Measuring range CO: 0-40%
CO2: 0-20%
CH4: 0-10%
CnHm:0-5%
O2: 0-5%
calorific value
Accuracy ±1%FS

Overview of project implementation plan:
The GasTDL-3100 series of laser gas analyzers is specially designed for specific working conditions involving coal gas, dust, and moisture. It can be installed in situ for 24-hour unattended testing, ensuring that the system is long-term stable, accurate, and continuously online. run.
In addition, the laser analyzer can detect in real time, with a response speed of ≤1s and a 4-20mA signal output, which can be directly output to the on-site central console to participate in project control.

The project site: