Study On The Combustion Characteristics Of Oil-based Rock Cuttings And Red Mud Mixed In CFB

With the rapid development of human society and the improvement of production and consumption levels,energy shortages and environmental pollution problems have become increasingly prominent.At the same time,due to the expansion of industrial scale,a large amount of industrial solid waste is generated,which has caused great pressure on the environment.In this context,it is not only necessary to improve energy efficiency and rational use of energy resources,but also to improve pollution control rates.Therefore,it is urgent to explore an efficient resource-based and harmless technology.Circulating fluidized bed(CFB)has become an effective treatment method for a variety of industrial solid wastes due to its wide fuel adaptability and low pollutant emissions.For this reason,this paper selects two typical industrial solid wastes(oil-based cuttings and red mud)as the research object to explore the feasibility of CFB combustion technology to treat oil-based cuttings and red mud.Oil-based cuttings are a kind of industrial solid waste with low calorific value and energy recyclable value.However,there are few reports on the combustion characteristics of oil-based cuttings at home and abroad.In this paper,CFB combustion technology is used to study the combustion characteristics of oil-based cuttings,pollutant emission characteristics and methods to reduce pollutant emissions.Red mud has the potential to be used as a desulfurization agent.At present,most of the research on red mud in desulfurization focuses on particle adsorption,desulfurization slurry,red mud attached liquid,etc.,and the research and reference projects for red mud desulfurization in CFB furnace There are fewer application cases.The main research contents of this article include:(1)Based on thermogravimetric analysis,the ignition,burnout and combustion rate of oil-based rock cuttings and blended coal particles were studied.The kinetic parameters of various fuels were obtained by Coats-Redfern method based on the thermogravimetric analysis results.This part of research work provides data and theoretical support for the subsequent CFB combustion test of oil-based cuttings.(2)The combustion characteristics and pollutant emission characteristics of oil-based cuttings under different combustion conditions were studied in the CFB test bed.The influence of mixed oil-based cuttings on temperature distribution,combustion efficiency and pollutant emission in the furnace under different combustion conditions was emphatic studied.(3)The desulfurization experiment of the red mud discharged from an aluminum oxide plant in CFB furnace was carried out,and compared with the desulfurization effect of limestone under the same combustion condition,it was confirmed that it has the application prospect of replacing limestone for desulfurization in furnace,so as to realize the large-scale utilization of red mud.(4)Conduct on-site performance test experiments on an industrial CFB boiler unit of an alumina plant,obtain the relevant operating parameters of the unit,obtain the boiler thermal efficiency through thermal calculation,and analyze the main reasons for the heat loss in combination with the operating parameters,and propose to optimize the boiler operation Suggestions.Secondly,combined with the basic situation of the unit,the actual impact of oil-based cuttings and red mud on the unit when participating in the operation of the boiler is analyzed,and the relationship between the boiler operating load and the maximum mixing ratio is obtained.Finally,a pretreatment plan for industrial solid waste before blending is designed,which has guiding significance for the future industrial application of industrial solid waste in CFB.