新型催化裂解快速流化床内颗粒浓度分布实验研究

doi:10.11949/0438-1157.20210164

摘要/Abstract

摘要：

催化裂解反应器是石油深度加工的重要反应器，采用实验方法对新型快速床催化裂解反应器内气固两相流动特性进行了研究，测量了床层内颗粒浓度分布，考察了气体流量对床层轴向和径向上颗粒浓度分布的影响。实验结果表明，床层轴向上颗粒浓度呈现下部稠密上部稀疏的分布规律；当气体流量较低时轴向颗粒浓度呈S形分布，高气量下呈现指数函数形分布，即反应器上部区域的颗粒浓度分布影响较小；床层径向颗粒浓度分布呈现中心稀、边壁浓的特征，且增大空气流量，径向分布趋于均匀。在一定操作条件下，与传统提升管相比，新型快速床颗粒浓度显著提高。

关键词: 催化裂解, 快速流化床, 扩径段, 颗粒浓度

Abstract:

Catalytic cracking reactor is an important reactor for deep processing of petroleum. In this paper, the gas-solid two-phase flow characteristics in a novel fast fluidized bed catalytic cracking reactor were studied by experimental method, and the particle concentration in the bed was measured, the effect of gas flow rate on the axial and radial distribution of particle concentration was investigated. The results show that the axial particle concentration in the bed presents a dense and sparse distribution in the lower part, an S-shaped distribution of axial particle concentration when the gas flow rate is low, and an exponential distribution when the gas flow rate is high, the particle concentration distribution in the upper part of the reactor has little effect, and the particle concentration distribution in the radial direction of the bed has the characteristics of sparse center and dense side wall, and the radial distribution tends to be uniform with the increase of air flow rate. Under a certain operating condition, the solids concentration of the novel fast fluidized bed is significantly increased compared with the conventional riser.

Key words: catalytic cracking, fast fluidized bed, diameter-enlarged section, solids concentration

中图分类号:

TE 624.4⁺1

王景效, 贺翔宇, 龚剑洪, 许建良, 刘海峰. 新型催化裂解快速流化床内颗粒浓度分布实验研究[J]. 化工学报, 2021, 72(8): 4104-4110.

Jingxiao WANG, Xiangyu HE, Jianhong GONG, Jianliang XU, Haifeng LIU. Experimental study on solids concentration in novel fast fluidized bed for catalytic cracking[J]. CIESC Journal, 2021, 72(8): 4104-4110.

图/表 8

图1 新型催化裂解快速流化床和传统提升管结构示意图

Fig.1 Schematic diagrams of novel fast fluidized bed and conventional riser geometries for catalytic cracking

图2 实验流程1—reactor; 2—computer; 3—fiber optic measuring instrument; 4—fiber optic probe; 5—roots fan; 6—rotor flow meter; 7—bag filter; 8—solid storage vessel; 9—compressed air cylinder; 10—feeder

Fig.2 Flow chart of experiment

图3 颗粒粒径分布

Fig.3 Distribution of particle size

表1 实验工况

Table 1 Experimental conditions

颗粒流量G_s/(kg/h)	进气量G_g/(m³/h)
inlet 1	总进气量	inlet 1	inlet 2
1000	340	36	4×76
	392	40	4×88
	444	44	4×100

图4 颗粒浓度轴向截面平均分布（a）、轴线分布(b)和近壁面分布(c)

Fig.4 Axial profiles of cross-sectional averaged solids concentration(a), center solids concentration (b) and near wall solids concentration (c)

图5 不同气量下颗粒浓度径向分布

Fig.5 Radial profiles of solids concentration at different air flux rates

图6 不同高度截面颗粒浓度径向分布不均匀指数（a）和标准差的轴向分布(b)

Fig.6 Axial profiles of radial non-uniformity index (a) and standard deviation of solids concentration at different heights (b)

图7 新型快速床与传统提升管内颗粒浓度分布比较

Fig.7 Comparison of solids concentration between the novel fast fluidized bed and the conventional riser

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