Key Technologies to Improve Coal Injection Ratio
Coal injection ratio (CIR) is an important indicator of pulverized coal combustion efficiency. It is also widely used in coal utilization and energy consumption evaluation. The improvement of CIR is of great significance for energy saving and consumption reduction. There are some key technologies to improve CIR, such as low NOx combustion technology, enhanced combustion technology, coal powder injection controlling technology and rotating combustion technology.
Low NOx combustion technology is a kind of technology to reduce the emission of nitrogen oxides (NOx) and other pollutants during pulverized coal combustion. Research has shown that the application of low NOx combustion technology can significantly reduce the emission of NOx, improve the combustion efficiency and enhance the CIR to a certain extent. Common methods include combustor redesign, improvement of oxy-combustion and splashing rate, improved fuel nozzle design, supplementary entrance of inert gas and oxygen enrichment, improved flame image and fuel supply system, delayed flue gas recirculation etc.
Enhanced combustion technology is another kind of technique to improve the combustion efficiency of pulverized coal and CIR. This technology is mainly used to reduce the unburned particles in flue gas and enhance the combustion efficiency of pulverized coal. Commonly used techniques include fuel separation technology, fuel accelerators and fuel catalytic combustion technology and so on.
Coal powder injection controlling technology is another important technology to improve CIR. This technology is mainly used to control the injection time of coal powder and the amount of coal injection. Through this technology, the combustion stability of pulverized coal can be improved and the energy consumption of pulverized coal can be guaranteed. The commonly used methods include numerical simulation of coal powder injection control and optimization technology for coal injection and combustion control.
Rotating combustion technology is a technology to improve the combustion efficiency by preventing the flow field from being disturbed and adversely affecting the combustion state of the combustor. Through the rotation of the combustor, the local flame state can be improved and the combustion efficiency can be enhanced. In addition, rotating combustion technology can also reduce the temperature and NOx of the flue gas, and improve the CIR.
In conclusion, the key technologies to improve coal injection ratio (CIR) include low NOx combustion technology, enhanced combustion technology, coal powder injection controlling technology and rotating combustion technology. Through these improvements, the emission of pollutants and the energy consumption of pulverized coal combustion can be reduced, and the CIR can be improved.
