METHOD OF REDUCING SULPHUR DIOXIDE EMISSIONS FROM COAL

• US 3,823,676 A
• Filed: 10/10/1972
• Issued: 07/16/1974
• Est. Priority Date: 10/10/1972
• Status: Expired due to Term

• Current Assignee: James A. Maitland, Webster Warren Cook
• Original Assignee: James A. Maitland, Webster Warren Cook
• Inventors: Cook, Webster Warren, Maitland, James A.
• Primary Examiner(s): Sprague, Kenneth W.
• Assistant Examiner(s): Schwartz, Larry I.
• Application Number:
  US05/296,147
• Time in Patent Office: 644 Days
• Field of Search: 110/1J,1K,106 44/1R,4 201/17
• US Class Current: 110/342
• CPC Class Codes: C10L 9/10 by using additives
• CPC Class Codes: F23K 2203/008 Feeding devices for pulverulent fuel
• CPC Class Codes: F23K 3/00 Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Abstract

A method of reducing sulphur dioxide emissions from coal by adding an effective amount of Wyoming Trona to the coal for combining with sulphur in the coal to form a relatively heavy ash which is collected with other heavier ash for removal in the usual way.

Claims

2. A process as defined in claim 1, comprising the step of adding the Trona in a particulate form to coal particles and mixing the Trona throughout the coal particles.

3. A process as defined in claim 1, comprising adding the Trona in a particulate form as a layer generally on top of a bed of coal particles.

4. A process of reducing sulphur dioxide emissions to or below a predetermined level when burning coal containing in excess of one percent by weight of sulphur in a furnace, comprising adding an effective amount of Wyoming Trona to particles of said coal to be burned, subjecting the coal and Trona to heat and causing the Trona to combine with at least a portion of the sulphur to form as ash readily separable from gaseous products of combustion.

5. A process as defined in claim 4, wherein the coal contains up to about 6 percent by weight of sulphur and Trona is added in amounts up to about 20 percent by weights of the coal.

6. A process, as defined in claim 5 wherein the Trona comprises:

7. A process, as defined in claim 6, wherein the Wyoming Trona is at least partially refined prior to being added to the coal by the removal of part or substantially all of the inerts.

8. A process, according to claim 5, wherein the effective amount of Trona added is sufficient for reducing sulphur dioxide emissions in combustion gases to about 1 percent or less by weight.