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AssigneesElectric Power Development Co., Ltd., Kawasaki Jukogyo Kabushiki Kaisha
InventorsYasuyuki Nakabayashi, Yoshio Matsuura, Michio Kurihara, Takao Kamei, Akira Nakamura, Keiichi Komai, Akira Shimotamari, Takeshi Wakabayashi
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In a non-evaporating dehydration of brown coal, the coal is crushed and classified into lumps and fine particles. The lumps of coal are subjected to a non-evaporating dehydration in which waste water is produced. The waste water is contacted with the fine particles of coal so that components which affect the COD value of the water are absorbed by the coal particles. The coal particles are then burnt to produce saturated steam which is used in the non-evaporating dehydration.
A method for dehydrating porous low grade coal comprising the steps of:
An apparatus for dehydrating porous low grade coal comprising classifying means for classifying the coal into lumps suitable for non-evaporating dehydration and fine particles which are not suitable for non-evaporating dehydration, dehydrating means for subjecting the lumps of coal to a non-evaporating dehydration under hot water and steam to produce dehydrated coal and waste water, absorbing means for bringing the waste water into contact with the fine particles of coal so that components having influence on COD value of the waste water are absorbed by the fine particles of coal, separating means for receiving the waste water from the absorbing means and separating the fine particles from the water, boiler means for receiving the separated fine particles and burning said fine particles to produce steam, and means for recycling said steam to the dehydrating means.
Dependencies are inferred from the claim text.