固体热载体热解淮南煤实验研究

Solid heat carrier coal pyrolysis can be conducted at mild conditions to produce coal gas and light tar by using the combination of coal pyrolysis and char combustion with air. It has a good prospect of industrial application. In this work, an intermittent experimental apparatus with the capacity of 1 kg coal was set up for solid heat carrier pyrolysis of Huainan bituminous coal. Quartz sand was used as the solid heat carrier in the tests. The effects of initial temperature of solid heat carrier, pyrolysis time, mass ratio of solid heat carrier to coal and coal particle size on the yields of gas and tar were studied. The analysis result of gas product shows that the heating value of coal gas is about 38 MJ/m3. Low temperature tar and char with a good ability for combustion are generated in the process. Under the conditions of initial temperature of solid heat carrier of 700 ℃~900 ℃, pyrolysis time of 4 min～16 min, and mass ratio of solid heat carrier to coal of 5～9, the yields of gas and tar increase with initial temperature of solid heat carrier, and the yield of gas increases with pyrolysis time and mass ratio of solid heat carrier to coal. The initial temperature of solid heat carrier has great influence on the gas composition. Char agglomeration on the reactor inner wall can be reduced by raising the mass ratio of solid heat carrier to coal. For the purpose of producing tar, the suitable operating parameters should be the temperature ranging from 750 ℃ to 900 ℃ and the residence time of 4 min.