流动密封阀调节特性实验研究

Experimental Study of the Regulation Characteristics of a Flow Seal Valve

流动密封阀可作为加压灰渣的排放控制装置,本研究在流动密封阀返料实验台上对流动密封阀的调节特点进行了实验研究。主要通过固定松动风量改变流化风量、固定流化风量改变松动风量的方式,分别研究了流化风和松动风对颗粒质量流率的调节特点。研究发现松动风对颗粒质量流率的调节作用更加明显,随着松动风的增加,颗粒质量流率近乎线性增加,最后达到最大值。实验使用了3种不同粒径石英砂,研究了颗粒粒径对颗粒质量流率的影响。随着粒径的增加,获得相同质量流率所需风量也增加了。同时改变流动密封阀前后压差,也能够较好调节质量流率,压差增大,质量流率也增加。

The main results of an experimental work on the regulating characteristic of the loop seal used as an ash discharging device are reported in this paper.The influence of aeration rates in the two chambers of the loop seal on solids flow behavior were studied respectively.Compared with the aeration in the recycle chamber,the regulating characteristic of aeration in the supply chamber is better,due to its larger regulating range.Solids mass flux increases linearly with increasing aeration rate in the supply chamber until it reaches a maximum value.Three sizes of sands were used in the experiments.Results show that aeration requirement to obtain the same solids mass flux increases with the increase of particle sizes.Meanwhile,the effects of pressure drop of loop seal on solid mass flux were also evaluated.Results show that solids mass flux increases with the increase of the pressure drop.