Method and means for exploiting fuel having high sulfur content

• US 5,571,490 A
• Filed: 02/17/1994
• Issued: 11/05/1996
• Est. Priority Date: 04/11/1991
• Status: Expired due to Fees

• Current Assignee: Ormat Inc.
• Original Assignee: Ormat Inc.
• Inventors: Bronicki, Lucien Y., Doron, Benjamin
• Primary Examiner(s): Straub, Gary P.
• Application Number:
  US08/197,551
• Time in Patent Office: 992 Days
• Field of Search: 110/345, 110/347, 110/229, 423/244 A, 423/244 R, 423/242 A, 423/242 R, 423/244.01, 423/244.05, 423/244.07, 423/244.08
• US Class Current: 423/244.01
• CPC Class Codes: C01F 11/464 Sulfates of Ca from gases containing sulfur oxides
• CPC Class Codes: C10L 1/1233 oxygen containing compounds, e.g. oxides, hydroxides, acids and salts thereof
• CPC Class Codes: C10L 10/02 for reducing smoke development
• CPC Class Codes: C10L 10/04 for minimising corrosion or incrustation
• CPC Class Codes: F23C 1/00 Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air combustion apparatus characterized by the combination of two or more combustion chambers F23C6/00; pilot flame igniters F23Q9/00
• CPC Class Codes: F23G 2201/301 Treating pyrogases
• CPC Class Codes: F23G 2201/303 Burning pyrogases
• CPC Class Codes: F23G 2201/304 Burning pyrosolids
• CPC Class Codes: F23G 2900/7013 Incinerating oil shales
• CPC Class Codes: F23G 5/027 pyrolising or gasifying stage pyrolisation of sludge C02F11/00; destructive distillation of carbonaceous materials C10B53/00
• CPC Class Codes: F23G 7/05 of waste oils
• CPC Class Codes: Y02E 20/12 Heat utilisation in combustion or incineration of waste

Abstract

High sulfur content fuel is combusted in the presence of oil shale containing significant amounts of calcium carbonate so that the sulfur and calcium carbonate oxidize and react to form calcium sulfate particulate which captures the sulfur and in the fuel and prevents its release to the atmosphere.

Claims

1. A method comprising:

a) pyrolyzing a sulfur bearing fuel together with oil shale containing calcium compounds to produce a combustible gaseous product containing entrained particulate, and a carbonaceous residue product;

b) separately combusting said residue product with excess air at a temperature sufficient to produce hot gases and hot particulate;

c) separating said hot particulate from said hot gases to produce substantially particulate-free hot gases;

d) separating particulate from said combustible gaseous product to form combustible gases substantially free of particulate; and

e) mixing said substantially particle-free hot gases with said combustible gases substantially free of particulate to form a gaseous mixture substantially free of particulate.

2. A method according to claim 1 including burning said gaseous mixture substantially free of particulate in a combustion chamber and producing products of combustion.

3. A method for using sulfur-bearing crude oil comprising steps of:

a) processing said crude oil to produce at least one essentially sulfur free component and sulfur rich component;

b) mixing the sulfur rich component with oil shale containing calcium carbonate to obtain a mixture; and

c) pyrolyzing said mixture to produce combustible gases, particulates of calcium compounds entrained in said combustible gases, and a carbonaceous residue containing calcium compounds;

(d) combusting said residue with excess air to produce hot particulate that includes calcium sulfate, and hot gases;

(e) separating particulate from said hot gases to form hot gases substantially free of particulate;

(f) separating particulate from said combustible gases to form combustible gases substantially free of particulate; and

g) mixing said hot gases substantially free of particulate with said combustible gases substantially free of particulate to form a gaseous mixture substantially free of particulate.

4. A method according to claim 3 including burning said gaseous mixture in a combustion chamber of a boiler.

6. A method according to claim 3 wherein said sulfur bearing fuel is residual oil.

7. A method according to claim 3 including burning said combustible gases substantially free of particulate in a combustion chamber.

8. A method according to claim 7 wherein separation of said hot particulate from said hot gases is effective to produce substantially particulate-free hot gases which are applied to said combustion chamber.

5. A method comprising:

a) pyrolyzing with heat provided by hot particulate, a sulfur bearing fuel together with oil shale containing calcium compounds to produce a combustible gaseous product containing entrained particulate, and a carbonaceous residue product;

b) combusting said residue product with excess air to produce hot gases and hot particulate entrained in said hot gases;

c) separating said hot particulate from said hot gases to produce substantially particulate-free hot gases, and supplying the separated hot particulate to the pyrolysis of step (a) above; and

d) separating particulate from said combustible gaseous product to form combustible gases substantially free of particulate.

9. A method for using sulfur-bearing crude oil comprising steps of:

(a) processing said crude oil to produce an essentially sulfur free component and a sulfur rich component;

(b) mixing said sulfur rich component with oil shale containing calcium carbonate to obtain a mixture;

(c) pyrolyzing said mixture with heat provided by hot particulate to produce a combustible gas containing entrained particulate, and a carbonaceous residue;

(d) combusting said carbonaceous residue with excess air to produce hot particulate entrained in hot gases;

(e) separating particulate entrained in said combustible gas to form combustible gas substantially free of particulate;

(f) separating hot particulate entrained in said hot gases to produce hot gases substantially free of particulate, and supplying the separated hot particulate to the pyrolysis of step (c) above; and

(g) combining said combustible gas substantially free of particulate with said hot gases substantially free of particulate to form a gaseous mixture substantially free of particulate.

10. A method according to claim 9 including burning said gaseous mixture in a combustion chamber.

11. A method comprising;

a) pyrolyzing with heat provided by applied hot particulate, a sulfur bearing fuel together with oil shale containing calcium compounds to produce a combustible gaseous product in which particulate is entrained, and a carbonaceous residue;

b) separately combusting said residue with excess air to produce hot particulate entrained in hot gases;

c) separating hot particulate entrained in said combustible gaseous products to form combustible gases substantially free of particulate;

d) separating hot particulate entrained in said hot gases to produce hot gases substantially free of particulate, and a stream of hot particulate;

e) applying said stream of hot particulate to the pyrolysis of step (a) above; and

f) combining said combustible gases substantially free of particulate with said hot gases substantially free of particulate to form a gaseous mixture substantially free of particulate.

12. A method according to claim 11 wherein said sulfur-bearing fuel is residual oil.

13. A method according to claim 11 wherein said sulfur-bearing fuel is a solid.

14. A method according to claim 11 wherein the fuel and oil shale are mixed to form a mixture prior to the step of pyrolyzing.

15. A method according to claim 11 wherein said sulfur-bearing fuel is a liquid.

16. A method according to claim 11 including burning said gaseous mixture in a combustion chamber.

17. Apparatus comprising:

a) a mixer for mixing a sulfur bearing, non-solid fuel with oil shale containing calcium carbonate to form a mixture;

b) a pyrolysis chamber for pyrolyzing said mixture and producing combustible gases, calcium compound particulate entrained in said combustible gases, and a residue;

c) a reaction chamber for receiving said residue and reacting the same with excess air to form a mixture of hot gases and calcium sulfate particulate entrained in said hot gases;

d) a separator for separating particulate from said hot gases to form hot gases substantially free of particulate;

e) a separator for separating particulate from said combustible gases to form combustible gases substantially free of particulate;

f) means for mixing the combustible gases substantially free of particulate with the hot gases substantially free of particulate to form a gaseous mixture.

18. Apparatus according to claim 17 including a combustion chamber for burning said gaseous mixture and producing products of combustion.

19. Apparatus according to claim 18 including means responsive to the products of combustion produced by said combustion chamber for generating electricity.

20. Apparatus comprising:

a) a fuel source containing two different fuels, one being calcium-bearing oil shale, and the other being sulfur-bearing fuel;

b) a pyrolyzer constructed and arranged to pyrolyze applied fuels using heat provided by hot particulate to produce a combustible gaseous product containing entrained particulate, and a carbonaceous residue product;

c) means for applying said different fuels to said pyrolyzer;

d) a combustor for combusting said residue product with excess air to produce hot gases and hot particulate entrained in said hot gases;

e) a first separator for separating said hot particulate from said hot gases;

f) means for applying hot particulate from said first separator to said pyrolyzer; and

g) a second separator for separating particulate from said combustible gaseous product to form combustible gases substantially free of particulate.

21. Apparatus according to claim 20 wherein said sulfur-bearing fuel is residual oil.

22. Apparatus according to claim 20 including a combustion chamber for burning said combustible gases substantially free of particulate.

23. Apparatus according to claim 22 wherein said first separator produces hot gases substantially free of particulate, including means for applying said hot gases substantially free of particulate to said combustion chamber.

24. Apparatus comprising:

a) a mixer for mixing a sulfur bearing fuel with oil shale to form a mixture;

b) a pyrolysis chamber for pyrolyzing said mixture with heat from applied hot particulate, and producing hot combustible gases in which particulate material is entrained, and a residue

c) a combustion chamber for receiving said residue and combusting the same with excess air to form a mixture of hot gases and entrained particulate;

d) a separator for separating particulate material entrained in said combustible gases to form combustible gases substantially free of particulate;

d) a separator for separating particulate entrained in said hot gases to produce hot gases substantially free of particulate, and a stream of hot particulate;

e) means for applying said stream of hot particulate to said pyrolysis chamber; and

f) means for combining said combustible gases substantially free of particulate with said hot gases substantially free of particulate to form a gaseous mixture substantially free of particulate.