Study on Production of Unburnt Gas at The Unsteady State of Combustion Process in A Waste Incinerator

垃圾焚烧炉燃烧过程非稳态产生未燃气体的研究

基本信息

批准号：
11450197
负责人：
FUJIWARA Takeshi
金额：
$ 7.3万
依托单位：
KYOTO UNVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The concentration of Dioxins and PCBs in a municipal refuse incinerator depends on the concentration of unburnt gas that is produced. The unburnt gas is much generated in an unstable state at the beginning of waste combustion. In a batch incinerator where the operation of start up and shutdown is repeated frequently, the concentration of the unburnt gas will change drastically. In this study, behavior of solid waste combustion and unburnt gas production was clarified through the experiment which uses an electric furnace and an actual batch incinerator. Moreover, the concentration of the produced gas and the temperature in the furnace were simulated based on the waste combustion model and thermal gas flow analysis. The results are summarized as below:1) The weight loss ratio of each waste sample classified into one of the components of domestic waste was analyzed by using TG. After confirming the additive property of the reaction constant, the property of the representative waste on the thermal decomposition and combustion was calculated.2) The solid waste having three dimensional sizes was decomposed thermally or burned in the electric furnace controlled on the condition of furnace temperature, moisture, and apparent density. Then the production of CO were represented as a transfer function having a fourth-order lag element.3) Paper and plastics (PE, PS and PVC) were burned in an actual batch incinerator and then several kinds of gas components were measured continuously. The concentration of chlorinated phenol (CP) was also measured.4) The three dimensional profile of gas flow, gas concentration, and gas temperature was computed respectively through a hybrid simulation based on the waste combustion model and on the thermal gas flow model. Moreover, the gas mixing effect of the secondary combustion chamber was discussed.

市政垃圾焚化炉中二恶英和PCB的浓度取决于产生的未燃烧气体的浓度。在废物燃烧开始时，未燃烧的气体在不稳定状态下产生。在经常重复启动和关闭操作的批处理焚化炉中，未燃烧气体的浓度将发生巨大变化。在这项研究中，通过使用电炉和实际批处理焚化炉的实验阐明了固体废物燃烧和未燃烧气体的行为。此外，根据废物燃烧模型和热气流分析，模拟了产生的气体和炉中温度的浓度。结果总结如下：1）使用TG分析了分类为家庭废物组成部分之一的每个废物样品的重量损失比。确认反应常数的添加特性后，计算了代表废物对热分解和燃烧的特性。2）2）具有三维尺寸的固体废物被热分解或在炉子温度下控制的电炉中燃烧或在电炉中燃烧。，水分和明显的密度。然后将CO的产生表示为具有四阶滞后元件的传输函数。3）纸张和塑料（PE，PS和PVC）在实际的批处理焚化炉中燃烧，然后连续测量几种气体成分。还测量了氯化苯酚（CP）的浓度。4）基于废物燃烧模型和热气流模型，通过混合模拟分别计算出气流，气体浓度和气温的三维曲线。此外，讨论了次级燃烧室的气体混合效应。