Model prediction for particles circulation flux ratio in coupled reactor with riser and gas-solids loop fluidized bed

doi:10.3969/j.issn.0438-1157.2013.06.023

CIESC Journal ›› 2013, Vol. 64 ›› Issue (6): 2065-2071.DOI: 10.3969/j.issn.0438-1157.2013.06.023

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Model prediction for particles circulation flux ratio in coupled reactor with riser and gas-solids loop fluidized bed

WANG Dewu^1,2, YAN Chaoyu², LU Chunxi², ZHANG Shaofeng^1,3

1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
3. Engineering Research Center of Seawater Utilization Technology of Ministry of Education, Hebei University of Technology, Tianjin 300130, China

Received:2012-11-27 Revised:2013-01-09 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Natural Science Foundation of China(21106028,20976190)and the Natural Science Foundation of Hebei Province(B2013202125).

提升管与气-固环流床层耦合反应器颗粒相循环比的模型及预测

王德武^1,2, 严超宇², 卢春喜², 张少峰^1,3

1. 河北工业大学化工学院,天津 300130;
2. 中国石油大学(北京)重质油国家重点实验室,北京 102249;
3. 河北工业大学海水资源高效利用化工技术教育部工程研究中心,天津 300130

通讯作者: 卢春喜
作者简介:王德武(1980—),男,博士,副教授。
基金资助:
国家自然科学基金项目(21106028,20976190);河北省自然科学基金项目(B2013202125)。

Abstract

Abstract: A mathematical model predicting particles flux ratio between internal circulation and external circulation processed in a coupled reactor with gas-solids loop fluidized bed was established.In a wide range of operating conditions, particles circulation flux ratio was predicted, and the particles circulation ratio n_p=20 was determined as a criterion to analyze the particles mixing behavior in internal and external loops.The results showed that the calculated values basically agreed with experimental data, and the average relative error approached 15.35%.Particles circulation ratio increased with increasing superficial gas velocity in the draft tube, however decreased with increasing particles external circulation flux and opening rate of a lotus-shaped distributor, with the change in two stages, first fast and then slow.The transition points were U_g,d=0.50 m·s^-1, G_s,r=110 kg·m^-2·s^-1, and α=10% respectively.Under the operating conditions of riser superficial gas velocity U_g,r=10—21.17 m·s^-1, draft tube superficial gas velocity U_g,d=0.57—1.50 m·s^-1, particles external circulation flux G_s,r ≥110 kg·m^-2·s^-1, and distributor open rate α≥10%, the particles complete mixing status in the riser and the gas-solids loop bed reactor could be avoided.

Key words: riser, gas-solids loop fluidized bed, coupled reactor, mixing, ratio of particle circulation flux, internal circulation, external circulation

关键词: 提升管, 气-固环流床层, 耦合反应器, 混合, 颗粒相循环比, 内循环, 外循环

CLC Number:

WANG Dewu, YAN Chaoyu, LU Chunxi, ZHANG Shaofeng. Model prediction for particles circulation flux ratio in coupled reactor with riser and gas-solids loop fluidized bed[J]. CIESC Journal, 2013, 64(6): 2065-2071.

王德武, 严超宇, 卢春喜, 张少峰. 提升管与气-固环流床层耦合反应器颗粒相循环比的模型及预测[J]. 化工学报, 2013, 64(6): 2065-2071.

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Model prediction for particles circulation flux ratio in coupled reactor with riser and gas-solids loop fluidized bed

提升管与气-固环流床层耦合反应器颗粒相循环比的模型及预测

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