Trommel fines are a high-ash aggregate waste derived from material recycling facilities (MRFs) and are usually disposed in landfill. Increasing UK landfill tax and environmental concerns, however, calls for a flexible technology that can effectively process and extract valuable energy from trommel fines at high efficiencies. One possible technology is fast pyrolysis coupled to a combined heat and power (pyro-CHP) plant. To determine the feasibility of such technology, an understanding of its economic characteristics is required, in addition to the technical details. This study presents an economic evaluation of a pyro-CHP plant processing three pre-treated trommel fines feedstocks for energy recovery over a 20-year period. The three feedstocks were designated as DPT (from initial separation/size reduction), AW (from ash reduction by washing DPT with water) and AWS (from ash reduction by washing DPT with aqueous surfactant solution). Under all processing capacities (200 kg/h to 2000 kg/h) total revenues from the pyro-CHP system were higher than landfill costs, but only became profitable at 2000 kg/h processing capacity for the DPT feedstock. Further analysis showed positive net present values (NPV) only for AW and AWS, e.g. at 2000 kg/h capacities, with payback periods of about 14 years compared to 35 years for DPT at a fixed CHP efficiency of 60% and 20% internal rate of return (IRR). Sensitivity analysis carried out using different values of IRR and CHP efficiencies, confirmed the superior economic performance of the washed feedstocks over DPT, with payback periods reducing to about 6 years in some cases.

Trommel细粉是来自材料回收设施（MRF）的高灰分骨料废物，通常被处置在垃圾填埋场中。然而，英国对垃圾填埋场征税和环境问题的关注日益增加，因此需要一种灵活的技术，该技术应能以高效率高效地处理和从滚筒筛罚款中提取有价值的能源。一种可能的技术是与热电联产（pyro-CHP）设备耦合的快速热解。为了确定这种技术的可行性，除了技术细节之外，还需要了解其经济特征。这项研究提出了一种热解热电联产工厂的经济评估，该工厂加工了三种经过预处理的滚筒筛细粉原料，以在20年内回收能量。将这三种原料指定为DPT（从初始分离/减小尺寸开始），AW（通过用水洗涤DPT减少灰分）和AWS（通过用表面活性剂水溶液洗涤DPT减少灰分）。在所有处理能力（200 kg / h至2000 kg / h）下，热解CHP系统的总收入均高于垃圾填埋场的成本，但仅在DPT原料的处理能力为2000 kg / h时才获利。进一步的分析表明，仅AW和AWS为正的净现值（NPV），例如在2000 kg / h的产能下，投资回收期约为14年，而DPT的回收期为35年，固定CHP效率为60％，内部比率为20％收益（IRR）。使用不同的IRR和CHP效率值进行的敏感性分析，证实了洗涤后的原料优于DPT的经济性能，在某些情况下，投资回收期可缩短至6年左右。