南方能源建设 (Mar 2023)
Research Progress on Key Technologies for Coupled Combustion of Coal and Solid Waste in Coal-Fired Unit
Abstract
[Introduction] The co-combustion of coal and solid waste can not only realize the energy recycling of solid waste, but also is one of the paths to realize carbon emission reduction of coal-fired power generation. [Method] This paper reviewed the study on co-combustion of coal and solid waste in coal-fired power plants, and mainly introduced the combustion application and technology development of co-combustion of coal and different solid wastes based on the current mainstream power plant boiler as a reactor; Evaluated the development of co-combustion technology of coal and solid waste from the perspectives of fuel economy, fly ash characteristics of mixed fuels, pollutant emissions, and carbon tax; Finally discussed the characteristics of direct and indirect mixing technologies. [Result] Direct co-combustion of coal and solid waste is required to minimize the impact on boiler operation, especially the emission of gas pollutants, the impact of fly ash on heat transfer surfaces, and the harmless disposal of fly ash. Indirect co-combustion can avoid the influence of mixed fuel combustion on the furnace, but requires high hardware cost investment and more complicated coupling technology. The oxygen-enriched combustion technology still needs to optimize the existing boiler structure to improve the applicability of the technology. [Conclusion] The direct co-combustion is better than the indirect co-combustion considering the realizability and the cost, and the extensive adaptability of circulating fluidized bed fuel is conducive to the application of direct co-combustion technology of coal and solid waste. With the development of the oxygen- enriched combustion technology based on the circulating fluidized bed, it is more conducive to realize carbon emission reduction in coal-fired power plant.
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