Thermodynamic equilibrium model research and application of underground coal gasification

摘要

Integrated calculation method and calculation method of actual measurement method were merely applied for calculating air gas or gas producing with two-stage method and not suit for simulating gasification processes of air-steam method, oxygen-enriched air steam and pure oxygen steam method. Papers of how calculation method of reaction equilibrium been employed in underground coal gasification (UCG) has not been found. In order to guide the design of UCG, the reaction equilibrium model was established to simulate air-steam continuous method, oxygen-enriched air steam continuous method and pure oxygen steam continuous method of UCG. Meanwhile, corresponding three matlab programs was programmed. And it is proven that simulation results coincide with the actual field test data to a great extent. Besides, the rule of simulated UCG index changing along with steam-oxygen ratio is in accordance with lab test results. These show that thermodynamic and chemical processes of UCG can be well simulated by the model and programs.