Pak Song Chol, a researcher at the Faculty of Physical Engineering, has determined agitation factors of reactants for coal liquefaction, set up an experimental process, and studied their effects on the treatment through an experiment.
It is the mixing ratio in COWM(coal-oil-water mixture) production for liquefaction that should provide an environment for coal powder particles bonding into crude oil molecules and allow enough electric current for HVHF discharge. Here, the bonding environement depends on the ratio of oil while discharge current depends on the ratio of water.
At the begining, coal:oil:water =5:1:4 in w.t. ratio was adopted. However, self-oganization of coal powder particles needed higher ratio of oil so that different mixing experiments were conducted with different factors. As a result, it was concluded that coal:oil:water =1:(1~2):(0.5~1) in w.t. ratio is more effective for self-organization of coal powder particles of the mixture in post-reaction, as well as during discharge accompanied by continuous flow.
The experiments were conducted both in static and dynamic manners. The static experiment was for estimation of yield while the dynamic one was for quality assessment in addition to yield with different raw materials.
The measured factors and results showed that the diesel oil distilled out of the products in his ratio is as good as commercial diesel oil in terms of moisture content, ash content, sulfur content, aqui-soluble acid-alkali.
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