【摘要】 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.更多还原

【Abstract】 The mathematical model for calculation on flow rate and wall temperature of the waterwall with spiral tube coils was established according to the mass conservation,momentum conservation and energy conservation equations observed by the circuit and node.Then the flow rate distribution and wall temperature distribution of a 350 MW supercritical coal-fired boiler were calculated under different loads.Results show that for the waterwall with spiral tube coils,the flow rate deviations are no higher than ±6%,and the outlet temperature differences of the working medium are no higher than 10 K under the loads of boiler maximum continuous rating(BMCR),75% BMCR and 30% BMCR respectively.Both the flow rate deviation and thermal deviation are small.Under each load,the wall temperatures of the tubes are always within the allowable temperature range,and the operation of the boiler is safe and reliable.更多还原