Analysis of sewage sludge pyrolysis carbonization technology and carbon emission calculation
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摘要: 随着我国经济的高速发展和城镇化水平的提升,污水处理规模已经跃居世界首位。污泥作为污水处理的产物,其安全处理处置和资源化利用一直是污水处理领域的研究热点。污泥热解炭化技术是20世纪90年代在日本和欧洲发展起来的新技术。2008年以后,中国也逐步开展了污泥热解炭化的技术研究和工程应用。基于“双碳”目标,污泥热解炭化技术的资源化优势也逐渐受到重视。针对国内外污泥热解炭化技术的典型工程进行对比分析,日本在污泥热解炭化资源化利用方面的关注重点不是热解气,而是炭化处理得到的污泥热解炭化物,其目标是推进污泥热解炭化物在燃料、土地利用和建材利用等方面应用;欧洲在污泥热解炭化技术的驱动力来源于寻找比焚烧更清洁的处理技术,以及对污泥中磷的有效回收利用;我国在污泥热解炭化关键技术开发和一体化装备等方面仍有较大发展空间,面对当前工艺运行过程中存在的传热不均、效率不高等问题,还需要进一步摸索和优化。通过对某污泥热解炭化工程的工程设计思路进行系统性介绍,对污泥热解炭化工程进行系统性的碳排放分析,有助于推动国内污泥热解炭化关键技术的进一步优化和工程推广,提高工程项目运行水平和污泥炭产物的资源化利用效率。Abstract: With the rapid economic development and increasing urbanization level of China, the scale of wastewater treatment has reached the top in the world. Sludge, as a by-product of wastewater treatment, has always been a research hotspot in the field of wastewater treatment regarding its safe disposal and resource utilization. Pyrolysis and carbonization technology for sludge, a novel technique that emerged in Japan and Europe in the 1990s, was gradually introduced and applied in China after 2008. Amidst the growing focus on carbon emissions, the resource utilization advantages of sludge pyrolysis and carbonization technology have gathered increasing attention. This paper provides a comparative analysis of global typical sludge pyrolysis and carbonization projects. In Japan, the emphasis of sludge pyrolysis and carbonization is not on the pyrolysis gas, but on the utilization of the resulting sludge char. The primary goal is to promote the application of sludge char in various fields, including fuel, soil improvement, and construction materials. In Europe, the driving force behind sludge pyrolysis and carbonization technology is searching for cleaner alternatives to incineration and the effective recovery of phosphorus from sludge. In China, there is still significant improvement room in the development of key technologies and integrated equipment for sludge pyrolysis and carbonization. Issues such as uneven heat transfer and low efficiency during the process operation need further exploration and optimization. By systematically introducing the engineering design concepts of a specific sludge pyrolysis and carbonization project and conducting a comprehensive carbon emission analysis, this study aims to advance the optimization of key technologies and the promotion of sludge pyrolysis and carbonization projects in China. It also seeks to enhance the operational level of engineering projects and improve the resource utilization efficiency of sludge char products. Overall, this research highlights the potential of sludge pyrolysis and carbonization technology as a sustainable solution for sludge management, aligning with the global trend towards carbon neutrality and resource conservation.
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