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Research background and significance of flameless combustion

Research background and significance of flameless combustion
Flameless combustion is a combustion method without visible flame surface, which is the simplest and most direct judgment method.
1、 Research direction.
The main research direction is: pollutant emission control mechanism (especially nitrogen oxides, CO, CO); The transformation of gas boiler and oil-fired boiler to strengthen heat exchange; New combustion methods, such as oxygen combustion technology combined with other combustion methods, or improved normal temperature air flameless combustion technology; It is used for the combustion and gasification of low calorific value fuels (lean coal, blast furnace gas, biomass, municipal waste and sludge, etc.) and solid fuels (such as pulverized coal flameless oxygen combustion). The flameless combustion can be achieved by improving the combustion chamber and reducing pollutant emissions.
2、 Research background.
With the wide application of modern heat storage technology in industry, some heating devices burning high calorific value fuel generally work under high temperature conditions. In the conventional flame combustion mode, the chemical reaction is concentrated on the narrow flame surface, resulting in uneven temperature distribution and high flame front temperature, which will inevitably generate a large number of NO heat sources, and then generate CO.
Due to the increasing global attention to environmental issues and the continuous improvement of industrial emission standards, flameless combustion, as a new type of low-pollution combustion, has received widespread attention.
Domestic and foreign scholars have proposed many new combustion modes, but there are some technical defects. For example:
1. The preparation cost of catalytic combustion catalyst is high, and under high temperature conditions, the catalyst has poor stability and short service life;
2. Although rich oil - quenching - lean oil combustion can achieve ultra-low emissions (less than 20.5mg/m3), the current research on it is still mainly focused on gas turbines;
3. Although pure oxygen combustion can achieve near-zero NOx emission, the investment of pure oxygen enrichment in the early stage is very large.
3、 The advantages of flameless combustion.
Compared with other new low pollution combustion methods, flameless combustion technology has the advantages of simple equipment, uniform combustion, stable combustion, high efficiency, low emission, energy saving, less NOx generation inhibition, and lower CO content, and has broad application prospects in industry.
Compared with traditional combustion technology, flameless combustion technology has expanded the range of fuel combustion, stable combustion process, uniform temperature distribution in the combustion zone, low pollution emissions and low noise.