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根据回路和节点所遵守的质量守恒、动量守恒和能量守恒方程,建立了计算螺旋管圈水冷壁流量和壁温的数学模型.在此基础上,对1台350 MW超临界燃煤锅炉在不同负荷下的水冷壁流量分配及壁温分布进行了计算.结果表明:在锅炉最大连续蒸发量(BMCR)、75%BMCR及30%BMCR负荷下,螺旋管圈水冷壁的流量偏差不超过±6%,工质出口温差不超过10 K,流量偏差和热偏差均较小;各负荷下管壁温度均处于管子的许用温度范围之内,锅炉运行安全可靠.
According to the equations of conservation of mass, conservation of momentum and conservation of energy of the loop and node, a mathematical model for calculating the wall flow and wall temperature of the spiral pipe was established. Based on this, The results show that the flow deviation of the wall of helical coil is not more than ± 6 under the conditions of BMCR, 75% BMCR and 30% BMCR load. %, The temperature difference of the working fluid outlet does not exceed 10 K, the flow deviation and the thermal deviation are small; the pipe wall temperature under each load is within the allowable temperature range of the pipe, and the boiler operation is safe and reliable.