随着我国经济社会发展，城市生活垃圾产量迅速增加，生活垃圾的无害化处理中二噁英的减排一直是难点。首次针对某2×55 MW燃煤机组提出一种新的生活垃圾无氧热解灵活性耦合处置技术方案，并开展了垃圾无氧热解产物耦合协同处置工业化试验，测试该燃煤机组二噁英生成排放特性。实践证明该工艺方案不仅可实现生活垃圾协同处置，燃煤机组停炉检修时，仍能保证系统自平衡正常运行。结果表明，利用本工艺路线处理垃圾产生的二噁英含量远低于垃圾直接焚烧产生的二噁英含量；煤粉纯烧时，烟气中二噁英质量浓度为6.05×10-3 ng/m3（以TEQ计，下同）；垃圾耦合比例为4%时，烟气中二噁英质量浓度为5.34×10-3 ng/m3，最大限度折算垃圾热解油气燃烧排放的二噁英质量浓度后，最终烟气中二噁英总质量浓度分别为1.145×10-2和1.074×10-2 ng/m3，煤粉纯烧与垃圾掺烧烟气中二噁英含量差异不大，均满足上海市《燃煤耦合污泥电厂大气污染物排放标准》中二噁英排放限值要求0.02 ng/m3。研究表明，采用垃圾无氧热解耦合处置工艺，控制垃圾耦合比例不超过4%，燃煤耦合垃圾烟气中二噁英排放量不会显著升高。

With the development of the economy and society in China, the production of municipal domestic waste is rapidly increasing, and the harmless treatment of domestic waste, especially the reduction of dioxins, has been a major research challenge. A new technical proposal of flexible coupled disposal of domestic waste by anaerobic pyrolysis was proposed for a 2×55 MW coal-fired unit for the first time. The industrial experiment of coupled co-disposal of wasteanaerobic pyrolysis products was carried out, and the dioxins generation and emission characteristics of this coal-fired unit were mainly tested. It[JB(][XCp.tif]s proved that the process proposal cannot only realize the co-disposal of domestic waste, but also ensure the normal operation of the system self-balancing when the coal-fired unit is shut down for maintenance.The results show that the dioxins content generated by waste treatment using this process route is much lower than that generated by direct waste incineration.When pulverized coal is burned, the mass concentration of dioxins in flue gas is 6.05×10-3 ng/m3 (calculated by TEQ, the same below). When the garbage coupling ratio is 4%, the mass concentration of dioxins in the flue gas is 5.34×10-3ng/m3. The mass concentration of dioxins in the final flue gas is 1.145×10-2 ng/m3 and 1.074×10-2 ng/m3 respectively after the maximum conversion of dioxins mass concentration emitted by waste pyrolysis oil and gas combustion.There is little difference in dioxins content in flue gas between waste mixed combustion and pure coal combustion, and they both meet the requirements of dioxins emission limit of 0.02 ng/m3 in the Emission Standard of Air Pollutants from Coal-fired Coupled Sludge Power Plants in Shanghai.The study show that when the anaerobic pyrolysis coupled disposal process is adopted, the proportion of waste coupling is controlled to be less than 4%, and the dioxins emission in the flue gas of coal-fired coupled waste will not increase significantly.

0 引言

1 工艺路线与现场试验

   1.1 燃煤火电机组垃圾无氧热解灵活性耦合处置工艺路线

   1.2 现场试验

   1.3 二噁英测定

2 结果与讨论

   2.1 垃圾热解产物分析

   2.2 垃圾热解油气燃烧的二噁英排放

   2.3 生活垃圾耦合试验的二噁英排放

3 结论