关键词: 气力输送, 上出料式发送罐, 煤粉, 输送特性

Abstract: Experiments of pulverized coal pneumatic conveying using nitrogen were carried out in an experimental facility of top discharge blow tank at atmospheric pressure, and the conveying characteristics of top discharge blow tank was investigated. The influences of fluidizing gas flow rate, pressurizing gas flow rate and gas injection rate at the riser inlet on pulverized coal mass flow rate and solid-gas ratio were discussed. The typical test condition was compared with that of high pressure conveying. The results indicate that as the fluidizing gas flow rate increases, the pulverized coal mass flow rate and solid-gas ratio increase at first and then decline, respectively. As the pressurizing gas flow rate increases, the pulverized coal mass flow rate increases gradually, while the solid-gas ratio increases at first and then declines. As the gas injection rate at the riser inlet increases, the pulverized coal mass flow rate increases gradually, while the solid-gas ratio increases at first and then declines. Compared to high pressure conveying, the conveying at atmospheric pressure has higher mass solid-gas ratio, lower gas consumption rate and conveying energy consumption.

Key words: pneumatic conveying, top discharge blow tank, pulverized coal, conveying characteristics