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Method and apparatus for upgrading low rank coal

  • US 4,668,244 A
  • Filed: 08/21/1985
  • Issued: 05/26/1987
  • Est. Priority Date: 08/22/1984
  • Status: Expired due to Fees
First Claim
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1. A method for upgrading low rank coal comprising the steps of;

  • drying said low rank coal into dried coal;

    carbonizing said dried coal into carbonized coal;

    cooling said carbonized coal; and

    causing said cooled carbonized coal to adsorb tar produced from said dried coal in the carbonizing process to provide improved coal, wherein inflow of the outside atmosphere into a drying process atmosphere of said low rank coal as well as a tar adsorbing process atmosphere of said cooled carbonized coal is restrained, and wherein mixing of gas generated from said low rank coal during the drying and dehydrating process with gas generated from said dried coal during the carbonizing process at the time when said dried coal is fed into the carbonizing process atmosphere, as well as mixing of said gases with cooling process atmosphere gas of said carbonized coal and tar adsorbing process atmosphere gas of said cooled carbonized coal at the time when said carbonized coal is fed into the cooling process atmosphere, are also restrained.

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