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上海环境院张瑞娜:生活垃圾焚烧协同处置污泥优化思路,助力走出污泥之困!

2022-12-10 10:42:53来源:环保在线 编辑:粥粥阅读量:50399

导读:污泥之困待解,上海市环境工程设计科学研究院 研发中心总工程师&副主任 张瑞娜给出生活垃圾焚烧协同处置污泥技术工艺详解!
  污泥处理处置,发展至今似乎已经累积出了不少经验,藏在地里、掺在砖里、埋入土里等等,但,究竟哪一种才是最适合当下的环保之法呢?
 
  今年9月,这份事关污泥行业发展的《污泥无害化处理和资源化利用实施方案》终于迎来出台。污泥无害化、资源化利用是重点,厌氧消化、好氧发酵、干化焚烧、土地利用、建材利用等多元化组合方式处理污泥仍然是“国家推荐”。此外,该文件中,协同焚烧的处置方式也成功被“擦亮”。
 
  如,文件提及,含重金属和难以生化降解的有毒有害有机物的污泥,应优先采用集中或协同焚烧方式处理;利用本地垃圾焚烧厂、火力发电厂、水泥窑等窑炉处理能力,协同焚烧处置污泥;统筹城市有机废弃物的综合协同处理……
 

点击上图再临技术热↑

 

  2022视环会秋季展开展期间,上海市环境工程设计科学研究院  研发中心总工程师&副主任 张瑞娜 上线污泥处理处置研讨会(第四期),重点进行了围绕污水污泥的协同处置——生活垃圾焚烧炉掺烧污泥——的经验分享。
 
  张瑞娜表示,不同的污泥特征应选取不同的污泥处理技术,污泥所在地附近具有热电厂或者垃圾焚烧厂的,就适合采用焚烧处置。污泥焚烧处置技术主要包括污泥干化单独焚烧工艺及污泥干化协同焚烧工艺,协同焚烧工艺中则包括与焚烧厂的协同处置技术。
 
  据了解,焚烧协同处置的吨投资大约在30-100万元左右,运行费用略低,并且垃圾焚烧设施分部广、规模大,为协同焚烧污泥提供了设施基础。张瑞娜介绍表示,2021年底,我国焚烧能力达87万吨/日,生活垃圾处理能力占比为68.1%,全国焚烧项目超过1000座,以8%的掺烧比来计算,年可掺烧污泥量几乎可覆盖全部的污泥产量。
 
  虽然生活垃圾焚烧协同处置污泥的可行性大有,但张瑞娜也指出,由于焚烧炉掺烧污泥的物料特性差异较大,会产生臭气、炉膛结焦、烟气控制等方面的技术问题。那么,污泥与生活垃圾如何在一个焚烧炉内“和谐共处”,进行协同处置?
 
  针对燃烧控制,张瑞娜提出了五点建议:①炉排干燥段的长度合理才能确保垃圾燃烧完全,炉渣热灼减率应小于3%;②应结合推料速度、炉排移动速度等调节,控制料层高度;③一次风风量、风压应根据各段的需要合理分配和控制,焚烧炉出口氧含量6-10%;④炉排料层不得出现局部漏风现象;⑤采用再循环技术,减少NOx源的生成浓度。
 

  

  在结焦控制方面,采用污泥造粒系统设备,也将大幅减少粉尘飘出现象,使得燃烧更加均匀及稳定,减少结焦情况的发生。
 

 
  此外,张瑞娜还分享了焚烧预热干化污泥技术、污泥造粒后拱进料技术、炉膛内防结焦技术(结焦抑制剂)三方面技术在保证焚烧效果上的结合应用。外加生活垃圾焚烧协同处置污泥技术搭配松江天马生态低碳园区、奉贤协同焚烧示范工程等项目案例的讲解,未来将污泥协同处置技术“吃干榨净”?看来也不是没有可能。

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