Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA.
Bioresour Technol. 2010 May;101(10):3696-701. doi: 10.1016/j.biortech.2009.12.103. Epub 2010 Jan 21.
Thermochemical gasification is one of the most promising technologies for converting biomass into power, fuels and chemicals. The objectives of this study were to maximize the net energy efficiency for biomass gasification, and to estimate the cost of producing industrial gas and combined heat and power (CHP) at a feedrate of 2000kg/h. Aspen Plus-based model for gasification was combined with a CHP generation model, and optimized using corn stover and dried distillers grains with solubles (DDGS) as the biomass feedstocks. The cold gas efficiencies for gas production were 57% and 52%, respectively, for corn stover and DDGS. The selling price of gas was estimated to be $11.49 and $13.08/GJ, respectively, for corn stover and DDGS. For CHP generation, the electrical and net efficiencies were as high as 37% and 88%, respectively, for corn stover and 34% and 78%, respectively, for DDGS. The selling price of electricity was estimated to be $0.1351 and $0.1287/kWh for corn stover and DDGS, respectively. Overall, high net energy efficiencies for gas and CHP production from biomass gasification can be achieved with optimized processing conditions. However, the economical feasibility of these conversion processes will depend on the relative local prices of fossil fuels.
热化学气化是将生物质转化为电力、燃料和化学品最有前途的技术之一。本研究的目的是最大限度地提高生物质气化的净能源效率，并估计以 2000kg/h 的进料速率生产工业气体和热电联产（CHP）的成本。基于 Aspen Plus 的气化模型与 CHP 发电模型相结合，并使用玉米秸秆和干燥酒糟与可溶物（DDGS）作为生物质原料进行优化。对于玉米秸秆和 DDGS，气体产量的冷煤气效率分别为 57%和 52%。估计玉米秸秆和 DDGS 的气体销售价格分别为 11.49 美元和 13.08 美元/GJ。对于 CHP 发电，玉米秸秆和 DDGS 的电效率和净效率分别高达 37%和 88%，以及 34%和 78%。估计玉米秸秆和 DDGS 的电力销售价格分别为 0.1351 美元和 0.1287 美元/kWh。总体而言，通过优化处理条件，可以实现生物质气化生产气体和 CHP 的高净能源效率。然而，这些转化过程的经济可行性将取决于化石燃料的相对当地价格。
