In this study, a series of seven residual biomass feedstock was treated by hydrothermal carbonization (HTC) at temperatures of 180 °C, 210 °C, 240 °C, and 270 °C and residence times of 0.5 h, 2 h, and 4 h. The processed samples were analyzed with focus on properties that are relevant for the combustion of a fuel. Temperature was found to have the highest impact on fuel properties. HTC has a positive effect on the energy density of the material, increasing lower heating values typically by 10–15% at 180 °C and 47–59% at 270 °C. At the same time, mass yield was decreasing for increasing treatment temperature. The hydrothermal treatment was found to have a profound impact on the inorganic composition of the fuels, lowering significantly the alkali metal and chlorine content while increasing silicon and phosphorous concentrations in the ash. These transformations lead to improvements in ash melting temperatures and in molar S/Cl ratio, an indicator commonly used to assess the risk of high-temperature corrosion in biomass combustion. HTC is also expected to have a positive impact on fine particle emissions upon combustion due to lowered concentrations of elements responsible for aerosol formation after HTC treatment. On the other hand, HTC leads to higher nitrogen contents in the fuel, thereby potentially increasing the risk for higher NO_x emissions upon combustion of HTC-treated fuels. Overall, HTC clearly shows a positive effect on combustion properties, but the effects are fuel specific and especially interesting for biogenic waste that originates from lignocellulosic material. Applying the criteria of this study, the fuel properties of sewage sludge could not significantly be improved. For feedstock like this, the advantage of utilizing HTC as treatment lies in improved dewatering, storage, and feedstock logistics.

在这项研究中，通过在180°C，210°C，240°C和270°C的温度下以及0.5 h，2 h和4的停留时间下的水热碳化（HTC）处理了一系列七个残留的生物质原料。 H。分析处理过的样品时，重点放在与燃料燃烧有关的特性上。发现温度对燃料性能具有最大的影响。HTC对材料的能量密度有积极影响，通常将较低的发热量在180°C时提高10–15％，在270°C时提高47–59％。同时，随着处理温度的升高，产率下降。发现水热处理对燃料的无机成分具有深远的影响，显着降低了碱金属和氯的含量，同时增加了灰分中的硅和磷浓度。这些转变导致灰分熔融温度和S / Cl摩尔比（通常用于评估生物质燃烧中高温腐蚀风险的指标）的改善。由于降低了HTC处理后形成气溶胶的元素的浓度，HTC也有望对燃烧时的细颗粒排放产生积极影响。另一方面，HTC导致燃料中的氮含量更高，从而有可能增加NO含量较高的风险。由于降低了HTC处理后形成气溶胶的元素的浓度，HTC也有望对燃烧时的细颗粒排放产生积极影响。另一方面，HTC导致燃料中的氮含量更高，从而有可能增加NO含量较高的风险。由于降低了HTC处理后形成气溶胶的元素的浓度，HTC也有望对燃烧时的细颗粒排放产生积极影响。另一方面，HTC导致燃料中的氮含量更高，从而有可能增加NO含量较高的风险。_x HTC处理过的燃料燃烧时的排放量。总体而言，HTC显然对燃烧性能显示出积极的影响，但这种影响是特定于燃料的，对于源自木质纤维素材料的生物废料尤为有趣。根据这项研究的标准，污水污泥的燃料特性不能得到明显改善。对于这样的原料，利用HTC进行处理的优势在于改善了脱水，存储和原料物流。