TG-DSC Synchronous Thermal Analysis Of The Lignite And Process System Integration

We found two problems about the process simulation of lignite manufacture calcium carbide and acetylene:the high energy consumption of lignite transfer process; calcium carbide furnace gas containing a large amount of CO and the volumetric analysis can reach90%. Therefore, optimizating the energy about lignite upgrading, integrating the heat and material of the system and using the CO and H2O rationally and efficiently are our destination.First, in order to study the phenomenon and laws in the process of lignite upgrading, we selected four lignites to measure the differential scanning calorimetry (DSC) simultaneous thermal analysis data of the lignite upgrading. Combine the model-free method and multiple scanning method (heating rate of5K/min,10K/min,15K/min,20K/min,25K/min and30K/min) to figure out the kinetic parameters under different sizes (80—120mesh,120—140mesh and140—200mesh). According to the analysis of the process, we simulated upgrading process simulation and reduced the energy consumption.Then, use the low temperature and middle temperature water-gas shift process to be the process of H2production. Combine H2production process with lignite upgrading process to produce syngas with furnace gas and pyrolysis gas as the raw material. The basic operation process and parameter base on literature data, the system is integrated heat and material to get higher after economic integration and lower power consumption of the process route.The simulation results that the energy consumption for the three sections of the drying process is137.49kW and the traditional drying process energy consumption is323.71kW what indicated stage upgrading could reduce unit energy consumption. After the system integration, water drying unit exclusively for the production of water-gas shift H2. After heat integration systems, thermal drying unit is fully provided by the system’s internal heat logistics, cold and heat saving public works. The integrated energy system is greatly reduced, and the economy is greatly improved.