热电联产在集中供热改造中的节能分析

Energy Saving Analysis of CHP in the Heat Supply Modification

摘要: 本文以某一集中供热系统改造工程为例，提出实施热电联产的改造方案，并对改造后的供热系统进行能耗分析。节能改造后，发电和供热年总煤耗量共节约513,386 t。原供热锅炉的㶲效率为15.35%，改造后的锅炉㶲效率为42.6%。通过㶲分析发现，锅炉的㶲损率最大，占系统总㶲损失的81.2%。对热电厂的热力性能分析得出，增加供热抽汽量能够明显提高热电厂的总效率。由此可见，该改造方案能够有效提高系统效率，具有一定的推广价值。

Abstract: Taking the reconstruction project of one central heating system as an example, this paper puts forward the transformation scheme of the combined heat and electricity generation, and analyzes the energy consumption of the transformed heating system. The total coal consumption of power generation and heating was saved 513,386 t per year after energy saving transformation. The ex-ergy efficiency of the original heating boiler is 15.35%, after transforming, it’s 42.6%. While through exergy analysis, it is found that the boiler’ exergy loss rate is the maximum, accounting for 81.2% of the system’s total exergy loss. Additionally, the thermal performance of thermal power plant is analyzed, and the total efficiency of thermal power plant can be improved obviously by increasing the amount of air supply. Thus it can be seen that this reform scheme can effectively improve system efficiency and has certain promotion value.