高温下煤灰发生熔融，将会堵塞煤焦表面孔隙，增大气体扩散阻力，降低气化反应速率。
The gasification reaction rate would reduce because ash would melt, which will plug the coal surface pores and increase gas diffusion resistance.
本文以气体动力学理论为基础，论述了如何通过改进扩散泵的第一级喷咀来提高扩散泵的抽气速率。
This paper is based on the theory of gas dynamics, by means of improving the first nozzle of diffusion pump in order to increase the pumping speed of diffusion pump are reported in the paper.
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