Thermodynamic Analysis of Low-Rank-Coal-Based Oxygen-Thermal Acetylene Manufacturing Process System

In this paper, the low-rank-coal-based oxygen-thermal method acetylene manufacturing process is established and simulated. Through the novel graphic analysis tool EFGD (Exergy-flow Framework Grassman Diagram), the energy supply and demand, the energy utilization, and energy consumption distribution are therefore obtained. Results show that the carbide furnace unit is the largest exergy loss unit, and its internal exergy loss accounts for 57.52% of the total internal exergy loss, reducing carbon consumption in a carbide furnace and reusing the off-gas will do better to improve the energy consumption of the whole system. Moreover, to further investigate the thermodynamic mechanism of energy coupling and energy conversion as well as the cause of high energy consumption, the energy configuration with ΔG-T and the α-H-e diagram analysis is established. It reveals that the carbon combustion reaction in oxygen for CO production plays a major role in promoting the reaction for this process.