Study On The Quenching Section In Acetylene Process By Plasma Pyrolysis Of Coal

Efficiently using and recycling of resources is an important measure to solve the energy crisis.Compared with the traditional way to process acetylene by calcium carbide method,the plasma pyrolysis of coal to acetylene has a higher economic efficiency,and can benefit to China's energy structure which is coal-rich,oil-lean and gas-poor.Quenching is one of the most critical technologies for ensuring the yield of acetylene.Due to the high temperature of the system and the fast response,it is difficult to measure directly during the quenching process.Therefore,to develop the prediction model is very important.In this paper,the thermodynamic simulation of plasma pyrolysis of coal to acetylene is performed through the minimal Gibbs free energy method.The effect of contents of water and elementary composition in coal powder on the theoretical maximum yield of acetylene is analyzed.And it provides a theoretical basis to select and pretreat coal samples.With the plasma pyrolysis of coal to acetylene,typical coal samples from Xinjiang and Jiangxi provinces are selected for experimentation,the effect of operating conditions on the cracked gas composition after quenching process is investigated.Based on the thermodynamic equilibrium simulation,the temperature distribution during quenching and the calculation of the main chemical reaction kinetics of pyrolysis gas during quenching,a mathematical model for the plasma pyrolysis of coal to acetylene in the quenching section is established.The model results are in good agreement with the experimental data.Further,according to the established mathematical model,the main parameters of the quenching process,such as the the time constant and the effect of the temperature before quenching on the composition of the cracked gas after quenching are simulated and studied.The reasonable range of the main parameters provides an important reference values for the optimization of the quenching process.This paper improves the shortcomings of the original annulus quencher which is difficult to operate stably for a long time and difficult to be disassemble.On the basis of studying the wear resistance,adhesion and high temperature performance of the coating,and by CFD simulation,the production of acetylene of 3000 t/a and acetylene of 6000 t/a is designed by using a new coated annulus quenching protector with a coating material protecting.With boron nitride as the coating material,an annulus quencher is processed.At the same time,through the calculation of heat transfer,the gasification amount when the quenching water reaches the center of the quencher is obtained,and a design idea of a new type of cylinder quencher is proposed.