焦炉煤气冷-热-电三联供系统构建及能量和火用分析

Energy and exergy analysis for a coke oven gas based CCHP system

为解决焦炉煤气产量大、利用效率低等问题,设计了一套基于焦炉煤气的冷-热-电三联供系统,构建了系统热力学模型.以Aspen Hysys10为模拟和计算平台,研究了该系统在冬季、夏季及春秋过渡季典型工作日运行时的能量流和火用流.研究结果表明:该系统可使焦炉煤气的化学能得到合理的利用,不仅能同时向用户提供冷热电,而且能实现能量的有效梯级利用.在冬季、夏季及春秋过渡季的典型日,系统的综合能效分别为63.3%,63.5%和62.2%,火用效率分别为56.5%,57.1%和59.1%.最大的能损和火用损都发生在汽轮机中,该单元在设计或运行中都应该给予重视.

In order to solve the problem of large output and low utilization efficiency of coke oven gas,a CCHP system based on coke oven gas is designed.Taking Aspen hysys10 as the simulation and calculation platform,this paper systematically studies the energy flow and exergy flow of the system in winter,summer and transition seasons(spring and autumn),when it runs on a typical working day.The results show that the chemical energy of coke oven gas can be reasonably utilized by the system,which can not only provide cooling,heating and power to users,but also realizing the effective cascade utilization of energy.In the typical days of winter,summer and transition seasons(spring and autumn),the comprehensive energy efficiency of the system is 63.3%,63.5%and 62.2%respectively,and the exergy efficiency is 56.5%,57.1%and 59.1%respectively.The largest energy loss and exergy loss occur in the steam turbine,which should be given enough attention in design or operation.