Abstract
China began entering the 14th Five-Year Plan period in 2021. With the proposed carbon-neutral long-term goal, the strategic position of clean energy is becoming increasingly prominent. using biomass power generation is one of the main application ways. In order to study the mixed combustion process of coal and biomass, this paper takes 300MW lignite boiler as the research object and uses Fluent software to explore the influence of biomass types and the location of biomass nozzle on the mixed combustion, and obtains the corresponding temperature field, flue gas component field and the distribution of pollutant NO. The results showed that when the biomass particles were sprayed into a fixed position with a certain proportion, the NO emission of wheat, corn and cotton straw was reduced, and the effect of wheat straw was the most obvious. When a certain proportion of wheat straw and coal are co-fired, the higher the biomass nozzle position, the higher the peak temperature in the main combustion zone, and the better the emission reduction effect of NO.
Highlights
In recent years, China has vigorously developed renewable and clean energy, and the proportion of consumption has been increasing
The national 3060 target has been included in the 14th Five-Year Plan, requiring to peak CO2 emissions by 2030
In the mixed combustion characteristics of biomass and pulverized coal, Alexander Stroh [3] studied the changes in the fuel properties after adding biomass to powdered coal, arguing that biomass is a good substitute for powdered coal fuel while keeping the combustion system constant
Summary
China has vigorously developed renewable and clean energy, and the proportion of consumption has been increasing. As one of the renewable energy sources, biomass is often used in coupling with coal in large thermal power generating units [1] This way saves coal resources, and greatly reduces the emission of pollutants, which meets the development requirements of the country [2]. Zakieh Khorshidi et al [11] applied the new CO2 capture technology to an Australian coal-fired power plant in order to study the impact of biomass mixing on raw coal. He found that biomass was mixed by 10% under the original working conditions, and CO2 emissions were reduced by 9% based on the original basis. Taking corners of 300 MW tangential lignite unit as the research object, using Gambit software 1:1 simulation modeling, meshing, Fluent software is adopted to improve the working condition of pure coal and pulverized coal and biomass particles numerical simulation of combustion condition, and to get the results of numerical simulation were analyzed, and for burning coal and biomass mixing engineering experiment research to provide the corresponding theoretical reference
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