CCPP湿煤气热力学性质分析和简捷计算方法

针对联合循环机组煤气系统模拟中湿煤气热力学性质的计算方法进行了研究.分析结果表明当压力小于732kPa时,湿煤气仍可近似看做理想气体混合物,理想气体混合物热力学性质的计算方法仍然适用,计算误差较小.将湿煤气看成干煤气和水蒸气的混合物,给出了湿煤气热力学性质的计算步骤和通用计算公式.通过数值计算分析了湿煤气各成分体积分数、水分析出和温度变化对湿煤气热力学性质的影响,并基于上述分析结果给出了在联合循环机组煤气系统变工况模拟时湿煤气热力学性质的简捷计算方法.

Analysis and Simple Calculation Method for Thermodynamic Properties of CCPP Wet Coal-Gas

The calculating methods of the thermodynamic properties(TP) of combined cycle power plant(CCPP) wet coal-gas were analyzed which is used in the simulation of gas system.The results showed that wet coal-gas could be treated as ideal gas mixture reasonably and the common equations for the TP of ideal gas mixture were still valid if wet coal-gas pressure was below 732 kPa.The calculating error of the proposed method was small.The wet coal-gas was regarded as the mixture including dry coal-gas and water vapor,then the calculation process and common equations for the TP of wet coal-gas were discussed.The relationship between the fluctuations of the wet coal-gas composition,precipitation of water vapor,temperature fluctuations and the TP of wet coal-gas was analyzed based on the numerical computation.Finally,the handy calculation method of the TP of wet coal-gas was given,which could be used in the simulation of the CCPP coal-gas system under off-design conditions.