Flow characteristics and pressure drop across the Laval nozzle in dense phase pneumatic conveying of the pulverized coal

被引：22

作者：

Lu, Haifeng ^{[1
]}

Guo, Xiaolei ^{[1
]}

Huang, Wanjie ^{[1
]}

Liu, Kai ^{[1
]}

Gong, Xin ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Inst Clean Coal Technol, Minist Educ, Key Lab Coal Gasificat, Shanghai 200237, Peoples R China

来源：

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION | 2011年 / 50卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Laval nozzle; Dense phase pneumatic conveying; Pulverized coal; Pressure drop; Solids loading ratio; VENTURI; PERFORMANCE; MODEL;

D O I：

10.1016/j.cep.2011.03.009

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Experimental studies were performed to describe the physical phenomena occurring in dense phase pneumatic conveying of the pulverize coal with a Laval nozzle installed in the pipeline. The maximal coal mass flow rate decreased from 0.87 kg/s to 0.35 kg/s and an obvious decrease in the solids loading ratio was revealed after the Laval nozzle was installed. In addition, the Laval nozzle showed a better capacity of resisting disturbance, which made it easier to control the coal mass flow rate precisely and promoted the stable conveying process. These specific physical phenomena were proved to result from the high pressure drop of the Laval nozzle. Thereby, a mathematic model was developed to predict the two-phase pressure drop across the Laval nozzle. The pressure drop model described the experimental data within the 15% deviation. The main influence factors contributing to the pressure drop of the Laval nozzle were discussed using the model. Then the effects of gas mass flow rate, solids loading ratio, convergence angle, throat diameter and throat length were revealed. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：702 / 708

页数：7

共 28 条

[1]

AI WG, 2000, J ENG THERMAL ENERGY, V15, P607

[2] PRESSURE DROP IN FLOW OF DENSE COAL-AIR MIXTURES [J].