Energy recovery from waste incineration: assessing the importance of district heating networks.
Energy recovery from waste incineration: assessing the importance of district heating networks.
复制标题
废物焚烧能源回收：评估区域供热网络的重要性。
DOI：
10.1016/j.wasman.2010.03.026
复制
发表时间：
2010
期刊：
影响因子：
8.1
通讯作者：
T. Astrup
中科院分区：
文献类型：
--
作者：
Thilde Fruergaard;T. H. Christensen;T. Astrup
生活垃圾焚烧为丹麦400多个地区供热网络提供了20%的热量。在评估这种热能产生的环境后果时，典型的方法是假定其他(化石)燃料可以按1：1的比例节省(例如，1GJ的余热替代1GJ的煤基热能)。本文研究了丹麦两个特定区域供热网络中以废热为基础的热替代的后果，以及与这些网络相连的工厂之间的能量相关相互作用。尽管连接两个区域供热网络的垃圾焚烧炉的电力和热效率几乎相同，但能源和二氧化碳账户显示出显著不同的结果：一个网络的垃圾焚烧节省了48公斤CO2/GJ的能源投入，而另一个网络的负荷为43公斤CO2/GJ。这主要是由于与该网络相连的其他制热厂的运行模式和燃料类型不同造成的。这份文件清楚地表明，简单地评估焚烧炉的垃圾转化为能源效率不足以评估区域供热管网系统中热替代的后果。这篇论文还表明，使用全国平均值来替代热量并不能提供正确的答案：需要彻底解决当地的情况，否则我们可能无法正确评估垃圾焚烧的热量回收。
Municipal solid waste incineration contributes with 20% of the heat supplied to the more than 400 district heating networks in Denmark. In evaluation of the environmental consequences of this heat production, the typical approach has been to assume that other (fossil) fuels could be saved on a 1:1 basis (e.g. 1GJ of waste heat delivered substitutes for 1GJ of coal-based heat). This paper investigates consequences of waste-based heat substitution in two specific Danish district heating networks and the energy-associated interactions between the plants connected to these networks. Despite almost equal electricity and heat efficiencies at the waste incinerators connected to the two district heating networks, the energy and CO2accounts showed significantly different results: waste incineration in one network caused a CO2saving of 48kg CO2/GJ energy input while in the other network a load of 43kg CO2/GJ. This was caused mainly by differences in operation mode and fuel types of the other heat producing plants attached to the networks. The paper clearly indicates that simple evaluations of waste-to-energy efficiencies at the incinerator are insufficient for assessing the consequences of heat substitution in district heating network systems. The paper also shows that using national averages for heat substitution will not provide a correct answer: local conditions need to be addressed thoroughly otherwise we may fail to assess correctly the heat recovery from waste incineration.