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在输送压力可达4.0MPa,固气比高达450kg/m3的高压气力输送试验台上,用氮气进行粉煤高压浓相气力输送试验研究.分别在不同的输送差压、煤粉湿度、浓度和速度等条件下进行了输送试验,考察操作参数对煤粉固气比等气力输送特征参数的影响,用信息熵分析试验过程中采集到的压力波动时间序列,探讨流动稳定性和流型变迁过程中信息化趋势,建立信息熵和流型之间的关系.结果表明:在输送差压增大的过程中,固气比和Shannon信息熵均增大;气体流量与Shannon信息熵和固气比之间呈现较好的规律性;不同流动形态的Shannon熵差异较大,不同流型之间的Shannon熵区分度较好.随着煤粉湿度的增大,煤粉质量流量和Shannon熵均降低.Shannon信息熵分析为研究高压浓相气力输送流型、流动稳定性及其转变特性提供了一种行之有效的方法.
In the high-pressure pneumatic conveying test bed with conveying pressure up to 4.0 MPa and solid-gas ratio up to 450 kg / m 3, nitrogen was used to carry out high-pressure dense-phase pneumatic conveying of pulverized coal.Different conveying differential pressure, coal moisture, Velocity and other conditions of the transport test to investigate the operating parameters on the solid-gas ratio of pulverized coal and other characteristics of the pneumatic conveying parameters used to analyze the information collected during the test pressure fluctuations in the time series to explore the flow stability and flow-type process of change The relationship between entropy and flow pattern was established.The results showed that the solid-gas ratio and Shannon’s information entropy increased with the increase of differential pressure, and the relationship between gas flow and Shannon’s information entropy and solid-gas ratio The Shannon entropy of different flow patterns is quite different and the Shannon entropy of different flow patterns is well differentiated.With the increase of coal dust moisture, the mass flow of coal and Shannon entropy decrease Shannon ’s information entropy analysis provides an effective method to study the flow pattern, flow stability and transition characteristics of high pressure dense phase pneumatic conveying.