中文摘要：

在输送压力可达到4MPa、管路固气比可达到700kg／m。的高压超浓相气力输送试验台上进行输送物料为300μm煤粉和石英砂的流型可视化试验，获得了不同表观气速下物料的流型，研究了补充风风量对300Mm煤粉输送稳定性的影响．结果表明：在试验台范围内，随着表观气速的减小，输送煤粉时获得了悬浮流、分层流和沙丘流流型，输送石英砂时获得了分层流、沙丘流和柱塞流流型，且不同流型间的区分度优于输送煤粉时流型间的区分度；随着表观气速的减小，输送系统的稳定性下降，管路的振动和各管段压降随时间的变化验证了这一事实；在输送300μm煤粉时，过小的补充风风量易发生堵管现象；沙丘流或柱塞流状态均属于间歇流动状态，且柱塞流状态是一种比沙丘流状态更不稳定的低速复杂流动状态．

英文摘要：

Experimental study on flow regime of pulverized coal （300/~m） and quartz sand was visually con- ducted on a high-pressure dense-phase pneumatic conveying test rig at a pressure up to 4 MPa and solid-gas ratio up to 700 kg/m3 , so as to obtain the flow regime of both the pulverized coal and the quartz sand under different superficial gas velocities, and analyze the influence of supplementary air volume on delivery sta- bility of the 300 μm pulverized coal. Results show that with the reduction of superficial gas velocity, the flow regime of pulverized coal is in turn of the suspension, stratified and slug flow kind whereas for quartz sand, the flow regime is in turn of the stratified, slug and plug flow type, with a more distinguish- able difference among various patterns; the flow regime becomes unstable with reducing superficial gas ve- locity, which indicates in the oscillation of pipeline and the fluctuation of pressure; when 300 μm pulver- ized coal is conveyed, the supplementary air with excessively low flow rate will lead to pipe blocking fail- ure; both the slug and plug flow are of the interrupted kind, and the latter one is a low-speed flow, which is even more unstable and complicated than the former one.