燃煤锅炉掺烧干、湿污泥系统的设计思路

Design of the System for Dry and Wet Sludge Coupling Combustion for the Coal-Fired Boiler

依托煤电机组高效的污染物处理设施处置生活污泥是较优的技术选择。针对燃煤锅炉改造同时具备掺烧湿污泥和干污泥(含水率分别约为80%、30%)能力的工程实例,研究耦合掺烧带来的臭气和干化污水问题,并对其处理系统进行设计优化。污泥接收、干化、输送等环节产生的臭气采用车间整体微负压控制和干化系统局部抽负压方式收集,集中送入二次风箱系统后,进入炉膛,利用高温燃烧除臭。污泥处置过程中的污水与有机污染物浓度较低的厂区生活污水混合,进入后续生化处理环节,最后送至现有工业废水中间水池回用,不发生外排。通过上述改进,避免了污泥耦合掺烧过程中产生的二次污染,为其他同类燃煤锅炉耦合污泥改造工程提供参考。

It is a more preferable choice to process the household garbage with high-efficiency pollutant treatment facilities of coalfired power generating units. Regarding a coal-fired power generating unit capable of firing both wet and dry sewage sludge(with the water contents of about 80% and 20% respectively) in the transformation project, this paper conducts the study on the odor and the sewage generated during the sludge drying process from the coupling combustion in the coal-fired boiler. Also it proposes the optimization design for their treatment system. The odor produced in the stages of receiving, drying and transportation of sludge is collected by the overall micro-negative pressure control of the workshop and the local negative-pressure pumping of the drying device, then through the secondary air bellows system fed into the boiler, and eventually eliminated completely after high temperature combustion. The condensed sewage is mixed into the domestic sewage with low organic pollutant concentration, then treated in the subsequent biochemical treatment process and finally flows into the intermediate water pool for the existing industrial wastewater and hence recycled without any external discharge. With these improvements, the potential secondary pollution that may occur in the process of sludge coupling disposal has been avoided. The design can provide references for the transformation project of other similar coal-fired boilers coupling with sludge disposal.