Study on effects of annular gas holdup in reversed flow jet loop reactor

doi:10.16085/j.issn.1000-6613.2018-1384

Abstract

Abstract:

Reversed flow jet loop reactor is a new equipment for strengthening the gas-liquid two-phase reaction process. Although it has been widely used in the industry, its theoretical research is far from mature, and the design of its industrial device still depends on experiment and experience. In this paper, the influential law of annular gas holdup in reversed flow jet loop reactor was studied by a self-made experimental equipment. First, inspiratory volume of ejector was measured, and the performance curve of the maximum inspiratory volume of ejector was obtained under different conditions. On this basis, the influence of gas flow rate, liquid flow rate, and ejector installation position on annular gas holdup was studied. Results show that gas flow rate and liquid flow rate had significant effect on gas holdup. Gas holdup was rapidly enhanced with the increasing of gas flow rate and liquid flow rate. While the influence of nozzle position on the gas holdup was relatively small. Considering the energy consumption and equipment cost of increasing gas phase flow and liquid flow rate, the preferred scheme is achieved by increasing the liquid flow rate.

Key words: loop reactor, gas holdup, ejector, process enhancement

摘要：

下喷式环流反应器是一种用于强化气-液两相反应过程的新型装置，虽然已在工业上有了较广泛的应用，但对其理论研究远未成熟，其工业装置的设计仍依赖于实验和经验。本文借助实验室自制实验装置，对下喷式环流反应器环隙气含率的影响规律进行了研究。首先，对喷射器的吸气量进行了测量，获得了不同条件下喷射器最大吸气量的性能曲线；在此基础上，分别研究了气相流量、液相流量以及喷射器安装位置对环隙气含率的影响规律。结果表明：气相流量和液相流量对气含率具有重要的影响，随着气相流量和液相流量的增大，气含率快速提高，而喷嘴位置对气含率的影响相对较小；考虑到增加气相流量和液相流量所需要的能耗和设备代价，通过增加液相流量来达到提高气含率的目的是优选方案。

关键词: 环流反应器, 气含率, 喷射器, 过程强化

CLC Number:

TQ110

Rongshan BI, Qingqing YANG, Chen CHEN, Shuguang XIANG. Study on effects of annular gas holdup in reversed flow jet loop reactor[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1696-1701.

毕荣山, 杨青青, 陈宸, 项曙光. 下喷式环流反应器环隙气含率影响因素[J]. 化工进展, 2019, 38(04): 1696-1701.

Figures/Tables 11

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参数	数值	参数	数值
反应器直径D/mm	200	导流筒上沿与溢流口距离n/mm	77
反应器高度H/mm	700	喷射出口与导流筒上沿距离m/mm	–22,8,38,68
导流筒直径d/mm	110	液相流量Q _L/m³·h^-1	1.0 ~ 1.5
导流筒高度h/mm	360	气相流量Q _G/m³·h^-1	0.25 ~ 1.75

参数	数值	参数	数值
反应器直径D/mm	200	导流筒上沿与溢流口距离n/mm	77
反应器高度H/mm	700	喷射出口与导流筒上沿距离m/mm	–22,8,38,68
导流筒直径d/mm	110	液相流量Q _L/m³·h^-1	1.0 ~ 1.5
导流筒高度h/mm	360	气相流量Q _G/m³·h^-1	0.25 ~ 1.75

喷嘴结构	名称	数值
	喷嘴直径/mm	4
	气体入口管径/mm	20
	工作液体入口管径/mm	20
	吸气室内径/mm	22
	喷嘴收缩角/(°)	15
	喷嘴收缩段长度/mm	27
	喷嘴出口距混合室进口长度/mm	10
	喉管径/mm	8
	喉管长/mm	64

喷嘴结构	名称	数值
	喷嘴直径/mm	4
	气体入口管径/mm	20
	工作液体入口管径/mm	20
	吸气室内径/mm	22
	喷嘴收缩角/(°)	15
	喷嘴收缩段长度/mm	27
	喷嘴出口距混合室进口长度/mm	10
	喉管径/mm	8
	喉管长/mm	64

D	——	环流反应器外筒内径，mm
d	——	导流筒内径，mm
H	——	环流反应器高度，mm
H ₁	——	U形管压差计测试端距液面的高度，mm
H ₂	——	U形管压差计测试端距液面的高度，mm
ΔH	——	压差计测试点高度差，mm
h ₁	——	U形管压差计测试端进水高度，mm
h ₂	——	U形管压差计测试端进水高度，mm
Δh	——	U形管内液面高度差，mm
M	——	喷射出口距导流筒上沿的距离，mm
n	——	导流筒上沿与溢出口的距离，mm
P _L	——	液相表面压力，MPa
P _V	——	气相真空度，kPa
Q _G	——	气相流量，m³/h
Q _L	——	液相流量，m³/h
ε	——	环隙气含率，mL/mL
ρ _L	——	流体密度，kg/m³
ρ _水	——	水的密度，kg/m³