污泥热水解-厌氧消化系统设计优化  

Design and Optimizing of Sludge Thermal Hydrolysis and Anaerobic Digestion Process

作　　者：杜强强 任丽超 戴明华 黄鸥 温瑛 

机构地区：[1]北京市市政工程设计研究总院有限公司,北京100082 [2]普拉克环保系统<北京>有限公司,北京100020

出　　处：《中国给水排水》2018年第2期68-72,共5页China Water & Wastewater

基　　金：北京市科技计划项目(Z151100002115054)

摘　　要：北京市已完成三座以热水解-厌氧消化为核心的再生水厂泥区升级改造,采用了Cambi的污泥热水解技术及Purac的厌氧消化技术,共11条热水解处理线完成启动调试进入正式生产。在系统启动调试及运行中,出现了换热系统效率未达到设计值致使消化池温度超标、工艺气管道超压停机等若干问题。通过将两条热水解处理线的出泥管路串联并使污泥两次经过一次热交换器,在冷却水总管中增加管道式紫外消毒器,加强外来污泥的管理,重新确认改造工艺气管线高程坡度等措施,有效解决上述问题,换热效率达到设计要求,消化池内的实测污泥温度为39~41℃、含水率为92%,满足设计及运行要求。设计换热系统时,应保证换热器内传热介质的流速,同时充分考虑污泥与冷却水的设计品质,减少设备内结垢、堵塞等影响系统的换热效果;设计及施工过程中,需严格按照设计坡度铺设工艺气管道,防止工艺气管道冷凝液水封现象的发生;在系统改造及调试阶段需注意消泡,严格监控消化池内控制指标,尤其是消化温度,保证整个系统的稳定安全运行;需加强对于整个泥区内换热系统、工艺气系统以及自控系统设备仪表的日常维护及保养。There has been finished three sludge treatment process u pgrading and retrofitting of re- claimed water plants in Beijing. Based on thermal hydrolysis （THP） and anaerobic digestion process from Cambi and Purac respectively, 11 THP disposing treatment lines were in normal production after starting and commissioning. During starting, commissioning and normal operation process, several prob- lems occurred, such as heat transfer efficiency below design value resulting in digestion tank temperature out of limits, gas pipeline over pressure resulting in THP system halt, and so on. In order to solve the problems above, some design measures were adopted as follows： the sludge treatment line of two thermal hydrolysis lines was connected in series and the sludge could pass through two primary heat exchangers in two times; tube type ultraviolet sterilizer was installed on header pipe of cooling water; out-plant sludge management was strengthened ; elevation and gradient of gas pipeline was reconfirmed and retrofitting. Asa result, the heat transfer system efficiency could achieve the design requirements. Actual sludge temper- ature and moisture content in digestion tank was 39 -41 ℃ and 92% respectively, which could meet the design and operation requirements. When designing heat transfer system, the flow rate of heat-transfer medium should be ensured and the design parameters of sludge and cooling water should be also taken in- to account to avoid reduction of heat transfer system efficiency via equipment internal scaling and bloc- king. Through design and construction process, gas pipeline should be laid according to design gradient strictly to prevent condensate water from blocking the gas pipelines. During retrofitting and debugging, defoaming should be paid more attention, and control index should be strictly monitored, especially tem- perature in digestion tank, to ensure safety operation of the system. Maintenance management of equip- ment and instrument in heat transfer, gas and autonomous system should be st

关 键 词：THP 换热系统 运行问题 改造方案 

分 类 号：TU992.3[建筑科学—市政工程]