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超临界循环流化床锅炉将循环流化床(circulating fluidizedbed,CFB)燃烧技术与超临界蒸汽压力循环的优点相结合。水冷壁流量分配是超临界循环流化床锅炉运行的一个主要技术关键。该文建立了计算复杂流动网络系统回路流量及节点压力的数学模型,并对非线性方程组采用迭代方法进行求解。对一台600MW中低质量流速超临界循环流化床锅炉水冷壁流量分配及壁温分布进行计算,分析中低质量流速在超临界循环流化床中应用的优点。结果表明在锅炉最大连续蒸发量(boiler maximum continuous rating,BMCR)、50%BMCR及30%BMCR负荷下,水冷壁的流量偏差和热偏差较小,流量偏差最大为6.6%。各负荷下管壁温度均处于管子材料的允许温度之内。该文可为超临界CFB锅炉的设计提供参考。
A supercritical circulating fluidized bed boiler combines the advantages of circulating fluidized bed (CFB) combustion technology with the supercritical steam pressure cycle. Water wall flow distribution is a key technical key to the operation of a supercritical circulating fluidized bed boiler. In this paper, a mathematical model for calculating the flow and node pressure of complex flow network system is set up, and an iterative method is used to solve the nonlinear equations. The flow distribution and wall temperature distribution of a 600 MW medium-low mass flow supercritical circulating fluidized bed boiler are calculated, and the advantages of medium and low mass flow rate in supercritical circulating fluidized bed are analyzed. The results show that the flow rate deviation and thermal deviation of water wall are smaller with the maximum continuous boiler (BMCR), 50% BMCR and 30% BMCR load, and the maximum flow deviation is 6.6%. The tube wall temperature at each load is within the allowable temperature of the tube material. This paper can provide a reference for the design of supercritical CFB boiler.