加压喷动流化床煤快速热解的三维数值模拟

doi:10.7523/j.issn.2095-6134.2020.02.010

中国科学院大学学报 ›› 2020, Vol. 37 ›› Issue (2): 210-219.DOI: 10.7523/j.issn.2095-6134.2020.02.010

加压喷动流化床煤快速热解的三维数值模拟

周冠文¹, 钟文琪¹, YU Aibing²

1. 东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室, 南京 210096;
2. 蒙纳士大学化学工程学院 ARC计算颗粒技术研究中心, 克莱顿, Vic 3800, 澳大利亚

收稿日期:2019-04-04 修回日期:2019-07-08 发布日期:2020-03-15
通讯作者: 钟文琪
基金资助:
国家自然科学基金重大项目（51390492）资助

Three-dimensional numerical simulation of fast pyrolysis of coal in pressurized spout-fluid bed

ZHOU Guanwen¹, ZHONG Wenqi¹, YU Aibing²

1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
2. ARC Research Hub for Computational Particle Technology, Department of Chemical Engineering, Monash University, Clayton, Vic 3800, Australia

Received:2019-04-04 Revised:2019-07-08 Published:2020-03-15

摘要/Abstract

摘要： 对处理量为50 kg/h的中试尺度喷动流化床反应器内加压煤快速热解过程进行数值模拟。研究反应器高度、煤进料口位置等结构参数以及不同压力（0.1、0.3和0.5 MPa）、射流风与流化风比值（0.2、0.3和0.4）和粒径（0~3和0~6 mm）等操作参数的影响规律。结果表明：升高压力，煤与半焦混合程度降低，煤气产率提高；流化风量Q_f不变，随射流风量Q_s增加，气固流动更剧烈，颗粒温度分布更加均匀，顶部出口颗量增加；增大粒径虽可降低挥发分出口的颗粒量，但不利于煤与半焦混合。

关键词: 加压煤分级转化, 加压煤热解, 喷动流化床, 数值模拟

Abstract: Numerical simulation of pressurized fast pyrolysis process of coal in a pilot-scale reactor with the capacity of 50 kg/h was carried out. Characteristics of structural parameters, such as reactor height, coal feeding inlet position, pyrolysis pressures (0.1, 0.3, and 0.5 MPa), ratios of spouted gas to fluidized gas (0.2, 0.3,and 0.4), and particle size (0-3 and 0-6 mm), were investigated. The results are shown as follows. With the increase of pressure, the mixing of coal and semi-coke became worse while the gas yield increased. Keeping the fluidized gas Q_f unchanged, with the increase of spouted gas Q_s, the gas-solid flow became more intense, the particle temperature distribution became more uniform, and the particle outflow at the volatile outlet increased. Although increasing particle size reduced the particle outflow at the volatile outlet, it might weaken the mixing of coal and semi-coke.

Key words: pressurized grade conversion of coal, coal pressurized pyrolysis, spout-fluid bed, numerical simulation

中图分类号:

TK16

周冠文, 钟文琪, YU Aibing. 加压喷动流化床煤快速热解的三维数值模拟[J]. 中国科学院大学学报, 2020, 37(2): 210-219.

ZHOU Guanwen, ZHONG Wenqi, YU Aibing. Three-dimensional numerical simulation of fast pyrolysis of coal in pressurized spout-fluid bed[J]. , 2020, 37(2): 210-219.

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加压喷动流化床煤快速热解的三维数值模拟

Three-dimensional numerical simulation of fast pyrolysis of coal in pressurized spout-fluid bed

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