夹套容器热化学处理柠檬甘蔗渣液化的数值与实验分析

B. Leite, D. Ferreira, S. Leite, Vanessa Lins
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引用次数: 0

摘要

本文研究了液化容器内热分布的时间演变,以及反应温度和反应时间对液化收率的影响。液化有两种不同的方式:(1)实验分析;(2)采用计算流体力学(CFD)的数值三维模型。用柠檬甘蔗渣样品、甘油和硫酸作为催化剂进行液化。测定了不同反应时间(30min、60min和90min)下的温度和液化率。从实验数据来看,反应90分钟的LY大于70% wt%。反应器内温度的升高是由传导和自然对流现象引起的。尽管夹套容器在125°C的温度下使用蒸汽,但工作条件允许将混合物加热到低于100°C。CFD热廓线与实验数据吻合。他们表示,需要60分钟才能使液化容器内的混合物达到稳定的加热状态。从CFD瞬态模拟中,观察到一些振荡和脱离实验数据,这可能是由于过程中流体性质的变化。尽管考虑了这些因素,但CFD对液化过程的传热分析还是令人满意的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and Experimental Analysis of Thermochemical Treatment for the Liquefaction of Lemon Bagasse in a Jacketed Vessel
In this work, it was investigated the time evolution of thermal profile inside a liquefaction vessel and how the temperature and time of reaction influenced liquefaction yield. Liquefaction was performed in two different ways: (1) Experimental Analysis; (2) Numerical 3-D model, using Computational Fluid Dynamics (CFD). Liquefaction was performed using lemon bagasse samples, glycerol and sulphuric acid, as catalyst. Temperature and liquefaction Yield (LY) were measured for different time of reaction (30, 60 and 90 minutes). From experimental data, LY were higher than 70 wt% for 90 minutes reaction. The increase in the temperature inside the reactor occurred due to the conduction and natural convection phenomena. Although the jacketed vessel was fed with steam at 125°C, working conditions allowed the heating of the mixture to less than 100°C. CFD thermal profile was in accordance with experimental data. They showed it was necessary 60 minutes to achieve a steady state of heating in the mixture inside this liquefaction vessel. From CFD transient simulations, it was observed some oscillations and detachment from experimental data, which may be due to changes in fluids properties along the process. Despite this consideration CFD could satisfactory analyse heat transfer in this liquefaction process.
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