Exergy Analysis for Thermal Power System of A 600 MW Supercritical Power Unit
Exergy Analysis for Thermal Power System of A 600 MW Supercritical Power Unit
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发表时间：
2010
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通讯作者：
Duan Yuanyuan
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作者：
Duan Yuanyuan
推导了回热系统的火用平衡矩阵方程，建立了火电系统火用分析的数学模型。利用该模型对国产N600-24.2/566/566型机组主要部件的火用损失和火用效率进行了计算。结果表明，低压加热器的火用效率低于高压加热器，低压加热器的火用破坏也较低。汽轮机的火用效率高于相对内效率，高压、中压和低压机组的火用效率分别为93.20%、96.18%和89.61%。但低压汽轮机的功量最大，具有节能潜力，锅炉的火用损失系数最大(49.47%)，凝汽器的火用损失系数较小(1.232%)，该电厂的计算热效率为44.54%，动力循环的火用效率为43.52%。
The matrix equation for exergy balance of regenerative system was derived,and the mathematical model for exergy analysis of thermal power system was presented.Exergy losses and exergy efficiencies of the main components of a domestic N600-24.2/566/566 power unit were calculated by this model.The results indicate that the exergy efficiencies of low pressure heaters are lower than those of high pressure heaters,the exergy destructions in low pressure heaters are also lower.The exergy efficiency of the steam turbine is higher than relative internal efficiency,the exergy efficiencies of the high pressure turbine,intermediate pressure turbine and low pressure turbine are 93.20%,96.18% and 89.61%,but the work of the low pressure turbine is the largest,so there is energy conservation potential for the low pressure turbine.The coefficient of exergy loss is found to be maximum in the boiler(49.47%) while much lower in condenser(1.232%).In addition,the calculated thermal efficiency of this power plant is 44.54% while the exergy efficiency of the power cycle is 43.52%.