Abstract:

The effects of gas entry route and blow tank pressure on characteristic of dense-phase pneumatic conveying of pulverized coal were studied in top discharge blow tank conveying system. Additionally，a comparison was made on solid mass flow rate，solid-gas ratio and conveying stability between top and bottom discharge blow tank conveying system. It was found that in top blow tank conveying system，solid mass flow rate and solid-gas ratio first increased and then decreased with the fluidizing gas in the conical section; decreased with the supplementary gas and fluidizing gas in the bottom section; while for the blow tank pressure increasing，solid mass flow rate and solid-gas ratio first increased obviously and then the increasing degree weakened. In the same total conveying pressure drop，there are higher solid mass flow rate and gas-solid ratio for the bottom than the top discharge blow tank conveying systems，but there was little difference in conveying stability between the two systems.

摘要：

考察了气体进入方式和输送压力对上出料发料罐系统粉煤密相气力输送特性的影响，并比较了上出料和下出料发料罐系统的煤粉输送量、固气比和稳定性差异。结果表明，在上出料发料罐系统中，随锥部气增加，煤粉输送量和固气比呈先增加后减小趋势；随底部气和调节气增加，煤粉输送量和固气比呈减小趋势；随输送压力增加，煤粉输送量和固气比先明显增加后增加趋势减弱。与上出料发料罐系统相比，相同输送差压下，下出料发料罐系统具有较高的输送量和固气比，但二者均具有良好的输送稳定性。