Physical Simulation Experiment of Underground Coal Gasification in Huachu Mining Area,Guizhou Province
In order to deeply explore the process parameters of lean coal gasification in the Liuzhihua mining area of Guizhou and steadily promote the demonstration of underground coal gasification engineering in Guizhou,a series of underground gasification physical simulation experiments and theoretical analysis were carried out.By constructing a comprehensive model system,the gasification process under different conditions such as oxygen concentration,gasifier structure,and coal seam moisture content was simulated,and the characteristics,gasification efficiency,and gasification product composition of lean coal underground gasification were systematically explored;A comprehensive evaluation of the impact of different factors on the gasification process provided strong data support for the optimization design and commissioning of the gasifier.The experimental results show that the structural differences of gasifiers have a significant impact on airflow distribution,heat transfer efficiency,and gasification product quality.At the same time,the support method of gasification channels,the concentration of combustion aids,and changes in coal seam humidity also affect gasification parameters.At an appropriate oxygen concentration,the lean coal in the Liuzhihua area of Guizhou can stably gasify to produce qualified synthetic feed gas.The gasifying agent is within the range of oxygen concentration below 70%.As the oxygen concentration increases,the effective components of the gas gradually increase,and the calorific value of the gas also increases accordingly;But when the oxygen concentration exceeds 70%,the CO content begins to decrease;In terms of temperature field,with the gasification process,the high temperature temperature field gradually moves towards the air outlet,and there is a cross distribution feature of high and low temperature areas,which is mainly caused by the existence of cracks between the coal blocks in the coal seam,which forms the bypass combustion.Therefore,in actual production in the later stage,thermal expansion and contraction protection measures must be taken for drilling,and the bottom of the drilling must be reinforced with support;Corresponding auxiliary gasification process measures need to be taken,such as reverse gasification,to maintain the stability of the high-temperature temperature field of the gasified coal seam and ensure the continuity and stability of the gasification process;In the later stage of gasification,it is necessary to add an appropriate amount of steam to optimize the gasification effect and improve the quality of coal gas.Through in-depth exploration of the characteristics and laws of underground gasification of poor coal,this study provides scientific basis and technical guidance for optimizing gasification process parameters,improving gasification efficiency and gas quality.
underground coal gasificationphysical simulationgasification process parameterslean coal
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