水蒸气辅助煤与生物质回转炉共热解制高热值可燃气特性研究

Characterization of Water Vapor-assisted Co-pyrolysis of Coal and Biomass in a Rotary Furnace to Produce High Calorific Value Combustible Gas

煤与生物质共热解作为实现这两种含碳资源高效清洁利用的重要技术路径,对实现碳中和目标有重要意义。本文旨在探究水蒸气辅助下,不同条件对煤与生物质共热解制备高值可燃气体(H_(2)、CH_(4)、CO)的影响。在大型回转炉中,探究了褐煤与玉米秸秆共热解及水蒸气辅助共热解温度、掺混比对H_(2)、CH_(4)、CO产气量和热值的影响,并通过Aspen Plus搭建热解模型对其进行验证。实验及仿真结果表明:秸秆与褐煤存在明显的协同效应,无水蒸气时最佳产气条件可燃气热值超过3000 J/L(热解温度600℃,秸秆掺混比80%)。水蒸气条件下,促进了共热解可燃气高热值组分H_(2)、CH_(4)、CO的生成,最佳条件下可燃气热值提升88%达到5639 J/L(热解温度800℃,秸秆掺混比80%)。

Co-pyrolysis of coal and biomass,as an important technological pathway to realize the efficient and clean utilization of these two carbon-containing resources,is of great significance to achieve the goal of carbon neutrality.This study aims to explore the effects of different conditions on the co-pyrolysis of coal and biomass to produce high calorific components of the gas(H_(2),CH_(4),CO)under the assistance of water vapor.The effects of temperature and mixing ratio on the gas production and calorific value of H_(2),CH_(4),and CO during the co-pyrolysis of lignite and corn stover and water vapor-assisted co-pyrolysis were investigated by means of a large-scale rotary furnace,and verified by an Aspen Plus model.The experimental and simulation results showed that there was an obvious synergistic effect between straw and lignite,and 80% of straw blending ratio and 600℃ temperature were the optimal conditions for gas production without water vapor,and the calorific value of the gas was more than 3000 J/L.The co-pyrolysis temperature needed to be raised appropriately under the conditions of water vapor participation,and the water vapor promoted the generation of high calorific components of the gas,such as H_(2),CH_(4),and CO,and the blending ratio of 80% of straw and the 800℃ co-pyrolysis temperature were the optimal conditions for the production of gas,and the temperature of the gas was the optimal condition.The 80% straw blending ratio and 800℃ co-pyrolysis temperature were the best conditions for gas production,and the calorific value of the gas was doubled to 5639 J/L.The results showed that the gas was produced under the condition of water vapor participation.