The Electrochemical Dehydration Process And Electro Bath Simulation And Optimization Research On Coal

The upper moisture will result in increase in the expense of heat energy, prolonging the time of coking, reducing the efficiency of cookery, and shortening the use time of cookery for coking. For power coal, the calorific value of coal decreases as the moisture in coal increases. Coal in the transport, it will be lost as the water leakage not only wastes the coal resources, but also pollutes the environment. In addition, the high moisture in fine coal, also leads to the accumulation of slime water piled around the venue, resulting in a waste of coal resources and environmental pollution. Therefore, the follow-up processing of fine coal dewatering has a very significant impact. At present, the study for a fine piece of coal dehydration design is still in exploration phase, and the research of dewatering equipment is lack of practical theory, with impersonated to optimize the structure of dehydration device and improve the theoretical study. The study has proved that the surface of fine coal is negative, so it is viable to change a series of capability of fine coal, insuring the dehydration of fine coal, by electrolysis.This paper chooses Xiqu coal (-0.5mm) for the study, on the base of investigation of the essential properties of Xiqu coal, investigated by adding electrolyte electrochemical electrolysis treatment, and studies the effect of electrode materials, coal slurry concentration, the electrolytic current, electrolysis time, the amount of electrolyte, various size and inland water in the dehydration and may obtain the optimal conditions. On this basis, using ANSYS and FLUENT software for electric field simulation and flow field simulation, and carries through experimental verification, as appropriate to the design of dewatering of fine coal chemistry provides a theoretical basis, the experimental results are as follows:1. The effects of graphite-iron, aluminum-aluminum, iron-iron, copper-copper electrodes on the fine coal dewatering is investigated. The research has shown that using graphite as the anode, iron as the cathode, not only the filtration rate is fast,but also the moisture in filter cake is low, cake moisture reduces 3%, and the amount of electrolyte depletion is lowest, electrolyte content of 500g/t.2. The effects of different electrolytes on the dewatering of fine coal is investigated, and obtained while the electrolyte was the aluminum salt, the dehydration was the best, in the case of adding aluminum electrolyte, the optimal, condition is got:electrolysis time is 30min; current strength is 0.3A; pulp concentration is 25%; electrolyte level is 500g/t, cake moisture reduces 4%.3. Different fractions of Xiqu coal dewatering electrochemical experiments were investigated, the result shows that in the case of adding electrolyte,it is advantageous for grain size 0.125-0.25mm to remove internal water; only being electrolyzed is favorable for grain size-0.125-0.5mm to remove internal water, and the cake moisture is 21%; with adding electrolyte, being electrolyzed, the cake moisture of grain size-0.25-0.5mm is reduced 8% than others.4. Utilizing the Ansys to simulate the electric field, it is obtained that hexagonal octahedral adjacent anode and cathode of the electrolytic cell structure is beneficial to electrolyze fine coal, coal slurry of fine coal by electric field with a mixture of electrolytes distribution area is the most extensive, most fully on, or even all located in one of the fine coal electrolysis, and footprint is small, further more it is easy to control.5. Utilizing the Fluent to simulate the flow field, it is obtained that rotor radius of 1.4cm, speed 78.54rad/s is more conducive to electrolysis.