污泥掺混制备生物质燃料技术现状与发展前景

Technical status and development prospect of biomass fuels prepared by sewage sludge and coal

为了减轻市政污泥对环境的污染,实现污泥的资源化利用,阐述了国内外污泥处置的现状,介绍了污泥与煤掺混制备污泥水煤浆、与煤(半焦)掺混制备成型燃料以及与植物秸秆掺混造粒制备燃料制备生物质燃料的研究现状。结果表明,污泥制备生物质燃料可以充分利用污泥中有效热值,既可以代替少量煤炭,还为污泥合理利用提供有效的技术途径。分析了污泥制备生物质燃料还存在规模小、能耗高、工艺复杂以及燃料热值低等问题,同时针对这些问题提出了应加强污泥深度改性制备高浓度燃料水煤浆、污泥与燃料秸秆造粒及污泥与煤(半焦)制备成型燃料所用高效黏结剂的开发、污泥在成型前的脱水干燥、成型燃料的防水处理以及污泥制备生物质燃料的工业化等方面的研究,以加速污泥制备生物质燃料的工业化应用。

In order to make full use of sewage sewage sludge and decrease its pollution,the status of sewage sludge disposal at domestic and abroad,research status of coal water slurry made from sewage sludge and coal,briquette fuels prepared by sewage sludge and coal or semi- coke and biomass fuels produced from sewage sludge and plant strew were introduced. The results showed that,the biomass fuels prepared by sewage sludge took fully advantage of efficient calorific value,the biomass fuels replaced a small amount of coal and provided effective technical way for sewage sludge use. There were also lots of problems during biomass fuels preparation,such as small capacity,high energy consumption,complex process,low calorific value. In order to resolve these problems,the paper provided development direction from strengthening research of high concentration coal water slurry made from modified sewage sludge,the development of efficient bonding agents which used in the preparation of fuel made from sewage sludge and straw,coal or semi- coke,the dewatering and drying technology of sewage sludge before briquetting,waterproofing technology of briquettes fuel,industrial applications of biomass fuel made from sewage sludge.