引入气相对D类颗粒间歇卸料过程特性的影响

doi:10.16085/j.issn.1000-6613.2020-0168

摘要/Abstract

摘要：

通过测量并分析引入气相前后D类颗粒间歇卸料过程中示踪颗粒的流动状态、压力分布和颗粒流率，发现床体内气固两相流动特性不仅随时间变化，还受到气速（正负压差）的影响。据此将卸料过程按时间分为3个阶段：初始蓄压（PS）阶段、稳定卸料（SD）阶段和非满管流（PP）阶段；并给出各卸料阶段不同正、负压差和重力条件下的气固流动特性。在时间较长、流场较为稳定的SD阶段，发现卸料口颗粒阻力是影响颗粒流率的关键参数，通过修正De Jong公式、Beverloo公式，依次建立卸料口颗粒阻力、D类颗粒卸料流率预测模型，与实验值吻合较好，有望为引入气相调控D类颗粒卸料流率的方法提供参考。

关键词: 引入气相, D类颗粒, 间歇卸料过程, 模型

Abstract:

The flow state of tracer particles, the pressure distribution as well as was the particle flow rate measured and analyzed with/without the entrained gas during the batchwise discharge process of Geldart D particles. It revealed that the characteristics of gas-solid two-phase flow in the bed changed with time and were affected by the gas velocity (positive and negative pressure difference). Therefore, the discharge process was divided into three stages according to time in this study: initial pressure-storage (PS) stage, stable discharge (SD) stage and partly-filled pipe-flow (PP) stage. The characteristics of gas-solid flow were provided in the conditions of positive and negative pressure difference and gravity in each stage. It revealed that the particle resistance at the discharge orifice was the key parameter affecting the particle flow rate in SD stage with long time and stable flow field. By modifying the formulas of De Jong and Beverloo, the prediction models of the particle resistance at discharge orifice and the particle flow rate of Geldart D particles were established, which had good agreement with the experimental data. The results could provide a reference for the regulation of the particle flow rate of Geldart D particles by entrained gas.

Key words: entrained gas, Geldart D particles, batchwise discharge process, model

中图分类号:

TQ022.3

贾启璠, 王若瑾, 赵斌, 万庆硕, 王德武, 张少峰. 引入气相对D类颗粒间歇卸料过程特性的影响[J]. 化工进展, 2020, 39(11): 4391-4400.

Qifan JIA, Ruojin WANG, Bin ZHAO, Qingshuo WAN, Dewu WANG, Shaofeng ZHANG. Influence of entrained gas on characteristics of Geldart D particles in batchwise discharge process[J]. Chemical Industry and Engineering Progress, 2020, 39(11): 4391-4400.

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