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Coal additives

  • US 4,807,542 A
  • Filed: 11/18/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 11/18/1987
  • Status: Expired due to Fees
First Claim
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1. A process for combusting a sulphur-bearing fuel comprising the steps of:

  • (a) introducing a mixture of said fuel, sulphur binding material and sulphur retaining material into a first combustion zone;

    (b) combusting said mixture in said first zone under conditions of fuel-rich stoichiometry and temperature wherein substantially all of said sulphur is captured in a solid form by said sulphur binding material and wherein the so-captured sulphur is bound to said sulphur retaining material, to produce combustion products including fuel-rich gases and solid sulphur-bearing flyash and slag;

    (c) combusting said combustion products in at least one additional fuel-rich combustion zone at conditions normally thermodynamically unfavourable for sulphur capture by said sulphur binding material and at a temperature above the fusion temperature of said solid sulphur-bearing flyash and slag to induce further interaction between the sulphur, the binding material and the retaining material to retain said sulphur in a solid form.

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