Bio-solid materials as alternate fuels in cement kiln, riser duct and calciner

• US 20050274068A1
• Filed: 10/05/2004
• Published: 12/15/2005
• Est. Priority Date: 06/14/2004
• Status: Abandoned Application

• Current Assignee: Lehigh Cement Company (Heidelberg Materials AG)
• Original Assignee: Lehigh Cement Company (Heidelberg Materials AG)
• Inventors: Nobis, Rainer, Alesi, Shane, Morton, Edward L.
• Application Number:
  US10/958,850
• Publication Number:
  US 20050274068A1
• Time in Patent Office: Days
• US Class Current: 44/606
• CPC Class Codes: C10L 2250/06 Particle, bubble or droplet size
• CPC Class Codes: C10L 2290/02 Combustion or pyrolysis
• CPC Class Codes: C10L 2290/06 Heat exchange, direct or indirect
• CPC Class Codes: C10L 2290/08 Drying or removing water
• CPC Class Codes: C10L 5/403 on paper and paper waste
• CPC Class Codes: C10L 5/42 on animal substances or products obtained therefrom , e.g. manure
• CPC Class Codes: C10L 5/44 on vegetable substances
• CPC Class Codes: C10L 5/442 Wood or forestry waste
• CPC Class Codes: C10L 5/46 on sewage, house, or town refuse C10L5/403, C10L5/406 take precedence
• CPC Class Codes: C10L 5/48 on industrial residues and waste materials C10L5/403, C10L5/406 take precedence
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel
• CPC Class Codes: Y02E 50/30 Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

Alternate fuels and method of using the alternate fuels for replacing all or part of conventional fuels used to heat a riser duct, calciner or kiln in a cement making process.

Claims

1. A method for supplementing or partial replacing conventional fuel in a cement making process with waste bio-solid material comprising the steps of:

selecting a waste bio-solid material having fuel value and other components that would not be deleterious to a finished cement made in said cement making process;

providing said waste bio-solid material with a moisture content at or below about 20% by weight said bio-solids having a maximum particle size of about 2 inches; and

introducing said bio-solid waste material into a combustion apparatus of said cement making process.

2. A method according to claim 1 including the step of adjusting said particle size of said waste bio-solid material to that required for the waste particles to remain in suspension in a combustion zone while being oxidized.

3. A method according to claim 1 including selecting said waste bio-solid material from the group consisting of municipal waste, paper making and wood processing wastes, industrial waste, food processing waste, and agricultural waste or mixtures thereof.

4. A method according to claim 3 including using a sludge of said waste material dried to a moisture content of at or below about 10% by weight and having an internal temperature at or below 104°

F. (40°

C.).

5. A method according to claim 3 including selecting organic dried sewage sludge as said waste.

6. A method according to claim 3 including selecting a waste material with fuel values and mineral values that can be recovered in a cement product by combination of said waste.

7. A method according to claim 1 including inventorying said waste material a storage device.

8. A method according to claim 7 wherein said waste material at a temperature not significantly higher than 104°

F. (40°

C.).

9. A method according to claim 1 wherein said waste solids are introduced into a main combustion zone of said cement making process.

10. A method according to claim 1 wherein said waste solids are introduced into one of a calciner, loop duct combustion zone or both in said cement making process.

11. A method according to claim 1 including the step of blending non bio-solid industrial waste having fuel and mineral values with said bio-solid waste material prior to introducing said blended material into a combustion apparatus of said cement making process.

12. A fuel or fuel additive resulting from one of municipal waste, paper making and wood processing waste, industrial wastes, food processing waste, agricultural wastes and mixtures thereof dried to a moisture content of at or below 10% by weight and having a maximum particle size of about 2 inches.

13. A fuel or fuel additive according to claim 12 including one of high carbon fly ash, flue dust and mixtures thereof blended with said waste.

14. A fuel or fuel additive resulting from blending one of municipal waste, paper making and wood processing waste, industrial wastes, food processing waste, agricultural wastes and mixtures thereof dried to a moisture content of at or below 10% by weight and having a maximum particle size of about 2 inches;

and

one of high carbon fly ash flue dust or mixtures thereof.