生物质在渣油中延迟焦化传热过程模拟

Heat Transfer Process Simulation for Biomass Delayed Coking of Residual Oil

生物质延迟焦化技术是一种新型的生物质热解技术,其中生物质颗粒在渣油中的传热是很重要的一个过程,本文构建了生物质颗粒在渣油延迟焦化过程中的传热模型,采用节点数值解法考察了颗粒半径、渣油升温速率以及生物质颗粒与渣油的表面换热系数对颗粒温差的影响,并分析了颗粒内部的温度分布。研究结果表明:颗粒内部最大温差与颗粒半径的平方和渣油升温速率成正比,颗粒壁面与渣油温差和换热系数成反比。

Biomass delayed coking is a new biomass pyrolysis technology. The heat transfer between the biomass particle and residual oil is an important step of the biomass delayed coking process. The paper presents a model for heat transfer between the bulk oil phase and the spherical biomass particles in delayed coking and its numerical solution using the node method for intra-particle heat conduction. Simulations were performed to illustrate the effects of particle size, heating rate and heat transfer coefficient on intra- particle temperature and temperature difference profiles. The results show that the largest intra-particle temperature difference is proportional to square of the radius and the heating rate and that the temperature difference of the oil-particle interface is inversely proportional to the heat transfer coefficient.