Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO<sub>2</sub>/N<sub>2</sub> as Carriers

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Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO₂/N₂ as Carriers

更新时间：2025-07-09

- Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO₂/N₂ as Carriers
- Vol. 46, Issue 9, Pages: 83-90(2012)
- 作者机构：
  
  东南大学能源与环境学院,南京,210096
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP274
- Online First：10 September 2012，
  
  Published：2012
- 稿件说明：
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Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO₂/N₂ as Carriers[J]. 2012, 46(9): 83-90.
DOI：

Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO₂/N₂ as Carriers[J]. 2012, 46(9): 83-90. DOI：

摘要

在高压密相气力输送实验装置上

研究了兖州烟煤在CO

和N

作为输送介质时

输送管路中水平弯管和垂直弯管压降的特性

以及云南褐煤煤粉含水率对水平弯管和垂直弯管压降的影响.结果表明:在系统压差相同

输送介质为CO

和N

时

水平弯管压降随表观气速U的下降而逐渐减小

时煤粉体积分数比N

时小; 垂直弯管压降随U的下降而减小

当U下降至5.3 m/s时

下垂直弯管压降达到最小值

下没有出现压降最低拐点

时垂直弯管的压降比N

时略高.由实验还发现

煤粉中水的质量分数增加会导致煤粉颗粒间相互粘黏、团聚

致使N

和CO

下水平弯管压降增大

垂直弯管压降小幅降低.通过模化理论和实验分析获得了不同输送介质下水平、垂直弯管的固相附加压损系数的拟合公式

由该式得到的弯管压降与实验吻合良好

误差在±5%以内.

Abstract

The pressure drop characteristics in the horizontal and vertical elbows of the pipeline for pulverized Yanzhou bituminous coal using CO

and N

as conveying gas separately were investigated at high operating pressures in the experimental equipment for dense phase pneumatic conveying. Then the effect of the moisture content of Yunnan lignite powder on pressure drop in the horizontal and vertical elbows was studied. The experimental results show that the pressure drop in the horizontal elbow decreased with the decrease in the apparent gas velocity using CO

at the same total conveying differential pressure

and the concentration of the powder with CO

was smaller than that with N

. The pressure drop in the vertical elbow decreased with the decrease in the apparent gas velocity

and the pressure drop in the vertical elbow using N

as conveying gas reached the minimum value when the apparent velocity dropped to around 5.3 m/s

while the pressure drop change in the vertical elbow using CO

as conveying gas had no such inflexion. Moreover

due to the change of the elbow location

the pressure drop in the vertical elbow with CO

was higher than that with N

. Further

the pressure drop in the horizontal elbow increased with an increase in the moisture content of pulverized coal with CO

or N

because of the powder adhesion and agglomeration caused by the increasing moisture content. Generally

the pressure drop in the vertical elbow decreased slightly with an increase in the moisture content. The regression formulae were obtained to predict additional pressure loss coefficient of the solid phase in horizontal and vertical elbows with different conveying gas on the basis of the modeling theory and analysis on the experiment

and the predicted results are in accordance with the experimental data with the relative error of within ±5%.

关键词

Keywords

references

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⁰

Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO2/N2 as Carriers

DOI：

摘要

Abstract

关键词

Keywords

references

Experimental Research on Pressure Drop in Elbows in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure Using CO₂/N₂ as Carriers