Study On Dry Dust Removal Process In Coal Plasma-pyrolysis Gases For Producing Acetylene And The Design Of Tar Removal Device

Using coal plasma-pyrolysis process to produce acetylene has the advantages of low-pollution, short process-flow, low resources consumption, efficiency, etc. It is of great potential to be a new way of coal clean-using, as well as a new method of acetylene producing. In this thesis, it was proposed an design for the removal of dust and tar from cracked gas for this process. Then, the related performances also have been studied experimentally.Firstly, based on the characteristics of cracked gas and combined with the present technologies and applications of dust and tar removal, route for the capture of dust and tar had been proposed, which contained the devices including cyclone, bag filter and bubble cap.Secondly, according to the process conditions of cracked gas, the detail design of cyclone, bag filter, and bubble cap tower (mainly for cooling and tar removal) was performed. Based on the gas flow rate and dust concentration of pyrolysis gas, the design of dust delivery system and control device, as well as the selection of the roots fan were then made for experiment purpose.Finally, the cold-state simulation experiment devices were debugged. To ensure the air tightness and test the performance of devices. By controlling the gas velocity within the range of required, the pressure gap of cyclone was determined to be 500Pa,and the bag filter is about 150Pa. As for the efficiency, it was found that the cyclone was up to 70%, and the bag filter could reach 99.94%. Under the conditions of the flow of gas remains at 180m3/h, and the concentration at 150g/Nm3, the outlet dust concentration of bag filter would be less than 50mg/Nm3 and the overall pressure resistance was less than 8KPa.Moreover, this thesis have raised a number of optimization solutions which can help some following test to reach a better performance.