火电厂储煤筒仓煤质导热系数的实验研究与数值模拟
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摘要
筒仓储煤由于煤自身的物理和化学性质,再加上储煤筒仓的"烟筒效应",煤炭在有限的封闭空间内热量得不到扩散,导致煤体氧化升温发生自燃或爆炸,影响电厂的安全有效运行。研究储煤筒仓内松散煤体的导热系数是解决松散煤体自燃问题的前提。采用数值模拟和试验研究相结合的方法,通过介绍导热系数的测量方法,在实验室搭建小型储煤筒仓和大型储煤筒仓进行导热系数试验研究,利用有限元软件Fluent建立小型储煤筒仓与大型储煤筒仓有限元模型,将试验结果与数值模拟计算结果对比分析,得出不同煤质的导热系数,保证电厂的高效运行,同时,温度场分布还可以为之后惰化保护装置的设计提供参数基础。
Due to the physical and chemical properties of the coal itself, coupled with the "smoke tube effect" of the coal silo, the heat of the coal cannot be diffused in a limited closed space, resulting in spontaneous combustion or explosion of the oxidation temperature of the coal body. Affected the safe and effective operation of the power plant. It is a prerequisite to solve the problem of spontaneous combustion of loose coal body by studying the thermal conductivity of loose coal body in coal storage silo. In this paper, by means of numerical simulation and experimental study, by introducing the measurement method of thermal conductivity, a small coal storage silo and a large coal storage silo are set up in the laboratory to conduct thermal conductivity test and study, and a finite element model of small coal storage silo and large coal storage silo is established by Fluent. The experimental results are compared with the numerical simulation results, and the thermal conductivity of different coal is obtained to ensure the efficient operation of the power plant. At the same time,the temperature field distribution can provide the parameter basis for the design of the inert protection device.
Due to the physical and chemical properties of the coal itself, coupled with the "smoke tube effect" of the coal silo, the heat of the coal cannot be diffused in a limited closed space, resulting in spontaneous combustion or explosion of the oxidation temperature of the coal body. Affected the safe and effective operation of the power plant. It is a prerequisite to solve the problem of spontaneous combustion of loose coal body by studying the thermal conductivity of loose coal body in coal storage silo. In this paper, by means of numerical simulation and experimental study, by introducing the measurement method of thermal conductivity, a small coal storage silo and a large coal storage silo are set up in the laboratory to conduct thermal conductivity test and study, and a finite element model of small coal storage silo and large coal storage silo is established by Fluent. The experimental results are compared with the numerical simulation results, and the thermal conductivity of different coal is obtained to ensure the efficient operation of the power plant. At the same time,the temperature field distribution can provide the parameter basis for the design of the inert protection device.
引文
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