| Hammer mill is one of the core equipment needed to process oil-bearing cuttings.Through the principle of thermal analysis,the oil-bearing cuttings can achieve solid-liquid separation in the range of 240°C~260°C.The method can reduce the crude oil content of oil-bearing cuttings to less than 1.0%,and can realize local emission.Hammer mills are widely used in offshore drilling platforms abroad.For this reason,this paper carries out experiments on thermal analysis of oil-bearing drill cuttings,and combines numerical simulation methods to study the heat transfer characteristics of the particles in the hammer mill.Firstly,a hammer grinding heat analysis experimental device was designed and constructed to carry out solid-liquid separation experiments on oil-bearing cuttings.According to the results,the influences of blade rotation speed,particle filling rate and particle liquid content on the temperature change were analyzed,and the variation law of the liquid phase content of the particles was obtained.Secondly,the particle discrete-element program is written in C++ and combined with the EDEM numerical simulation to realize the study of the internal heat transfer law of the hammer mill.According to the simulation results,the main factor influencing the temperature rise of the particles is the frictional heat generation of the particles.In view of the problem of low frictional heat generation and particle accumulation,the spacing between the blades is reduced,and shorten processing time of oily cuttings.According to the results of experiments and simulations,the blade rotation speed is 1800 rpm and the filling rate is 10%.When the oil content of the oil-bearing cuttings is 10%,the heat transfer effect of the particles in the hammer mill is the best,and the oil-containing drill cuttings are thermally resolved.Oil content is less than 1.0%.Improve the hammer grinding heat analysis device to achieve continuous drill cuttings with an average throughput of 82 kg/h. |
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