Investigation of influence of coal properties on dense-phase pneumatic conveying at high pressure--颗粒学报PARTICUOLOGY

Liang, C., Xie, X., Xu, P., Chen, X., Zhao, C., & Wu, X. (2012). Investigation of influence of coal properties on dense-phase pneumatic conveying at high pressure. Particuology, 10(3), 310–316. https://doi.org/10.1016/j.partic.2012.01.003

Investigation of influence of coal properties on dense-phase pneumatic conveying at high pressure

Cai Liang ^a *, Xiaoxu Xie ^{a b}, Pan Xu ^a, Xiaoping Chen ^a, Changsui Zhao^a, Xin Wu ^a

a School of Energy and Environment, Southeast University, Nanjing 210096, China
b Nanjing Department of Environmental Protection Branch, CHEC, Nanjing 210013, China

10.1016/j.partic.2012.01.003

Volume 10, Issue 3, June 2012, Pages 310-316

Received 8 May 2009, Revised 27 August 2009, Accepted 20 January 2012, Available online 21 February 2012.

E-mail: Liangc@seu.edu.cn

Highlights

► The shear tests of different pulverized coals were investigated to obtain effect of powder properties and types on flow characteristics.

► Pulverized coals at high pressure were conveyed to study effect of operated parameters and powder properties on mass flow rate, solid–gas ratio and pressure drop.

► Results of conveying experiment and shear tests were linked to analyze the flow characteristics of pulverized coal.

Abstract

Experiments of dense-phase pneumatic conveying of pulverized coal using nitrogen were carried out in a test facility at pressures of up to 3.7 MPa to study the effects of coal type, particle size and moisture content on flow characteristics. The Jenike shear test and scanning electron microscopy (SEM) were employed to provide a better understanding of effects of the material properties on flow characteristics. Two kinds of pulverized coals, Yanzhou and Datong, with similar particle size, moisture content and density, were used in the test. Pressure drop increases with increasing the particle size at similar solid–gas ratio, superficial velocity and pressure in the receiving hopper, and pressure drops through different test sections decrease firstly and then rise with increasing the conveying velocity for the same particle size, mass flow rate and pressure in the receiving hopper. The flowability of pulverized coal decreases with increasing the moisture content in the range from 3.24% to 8.18%. Unconfined yield strength (UYS) increases and flow function (FF) decreases with increasing the moisture content. Results of the shearing tests are consistent with the results of the conveying study. Pressure drops through different test sections are discussed and analyzed.

Graphical abstract

Keywords

Pneumatic conveying; Dense-phase; High pressure; Shear test; Flow characteristics

文章导读