新型气化装置中生物质传热特性研究

Heat Transfer Characteristics of a New Biomass Gasification System

基于生物质部分氧化气化动力学参数难于采用热重分析仪进行研究,本文设计了一个移动床实验方案,样品槽携带生物质样品进入具有线性温度分布的炉膛中加热,并配合一定流量的空气与逐步升温的生物质反应,以达到连续稳定的部分氧化气化。求解动力学参数,需要为生物质提供稳定的升温速率,因此,本文着重研究生物质样品在线性温度分布的炉膛中的升温特性,研究了样品厚度、样品槽运动速度对样品升温特性的影响。在生物质进样速率一定的情况下,改变样品槽运动速度,得到生物质有稳定的升温特性,并且升温速率可控,能达到生物质部分氧化气化动力学实验研究的要求。

For the reason of the difficult to study the kinetic parameters of biomass partial oxidation gasification with thermogravimetric analyzer, this paper adopts a moving bed as the biomass sample introduction system. A long tray carries biomass and moves into a furnace with linear temperature distribution of the entrance zone. Biomass is gradually heated and react with air. This system can get a stable partial oxidation gasification. A stable heating rate of biomass is needed to solve the kinetic parameters. Therefore, this paper focus on the characteristics of the heating process. The effect of sample thickness and the sample movement speed is numerically studied. The result shows that, with a certain biomass sample rate, this system can get a stable and controllable heating rate of the biomass. This system can be used to study the kinetic parameters of biomass partial oxidation gasification.