Sulfur-sorbent promoter for use in a process for the in-situ production of a sorbent-oxide aerosol used for removing effluents from a gaseous combustion stream

• US 5,499,587 A
• Filed: 02/19/1991
• Issued: 03/19/1996
• Est. Priority Date: 06/17/1986
• Status: Expired due to Fees

• Current Assignee: Intevep SA Apartado
• Original Assignee: Intevep, S.A. (PDVSA Gas SA)
• Inventors: Kramlich, John, Rodriquez, Domingo, Gomez, Cebers, Payne, Roy, Carrazza, Jose
• Primary Examiner(s): MEDLEY, MARGARET B
• Application Number:
  US07/657,103
• Time in Patent Office: 1,855 Days
• Field of Search: 44/301, 44/280, 44/457, 110/342, 110/345, 423/243, 423/244 R, 423/244 A, 431/2, 431/4
• US Class Current: 110/342
• CPC Class Codes: B01D 53/501 by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
• CPC Class Codes: C10L 1/328 Oil emulsions containing water or any other hydrophilic phase

Abstract

A process for the in-situ production of an effluent sorbent-oxide aerosol with promoter during the combustion of a hydrocarbon containing fuel whereby the effluents are removed from the resultant gaseous hydrocarbon stream comprises admixing an aqueous solution of the sorbent and promoter with the fuel, atomizing and combusting the mixture under controlled conditions so as to generate the effluent sorbent-oxide aerosol.

Claims

1. A process for the in-situ production of an effluent sorbent-oxide aerosol during the combustion of a hydrocarbon containing fuel whereby effluents are removed from the resultant gaseous hydrocarbon combustion stream comprising:

(1) forming an aqueous solution comprising an effluent sorbent compound selected from the group consisting of CaCl₂, Ca(NO₃)₂, Ca(CH₃ COO)₂, Ca(C₂ H₅ COOH)₂, Ca(CHOO)₂, Ca(OH)₂, CaO and mixtures thereof and a promoter selected from the group consisting of salts of Fe, Cu, Mn, B, Al, Na, K, P, V, Zn, Ni and mixtures thereof dissolved in water;

(2) admixing the aqueous solution of the effluent sorbent compound and promoter with a hydrocarbon containing fuel so as to form a combustible fuel mixture;

(3) atomizing said combustible fuel mixture and feeding said atomized fuel to a combustion zone;

(4) combusting said atomized fuel mixture in said combustion zone under controlled temperature conditions T₁ wherein T₁ is between about 1525°

K to about 2450°

K in the presence of an oxygen containing oxidant so as to obtain a sorbent-oxide aerosol with promoter comprising ultra-fine calcium sorbent-oxide particles having a mean diameter of less than 1.5 um in said gaseous combustion stream; and

(5) cooling said gaseous combustion stream to a temperature T₂ wherein T₂ is between about 700°

K to about 1500°

K so that said calcium sorbent-oxide particles absorb said effluents from said gaseous combustion stream.

2. A process according to claim 1 wherein said temperature T₁ is between about 1900°

K to about 2200°

K.

3. A process according to claim 2 wherein said temperature T₂ is between about 1000°

K to about 1500°

K.

4. A process according to claim 3 wherein said sorbent oxide particles have a mean diameter of about ≦

1.0 um.

5. A process according to claim 1 wherein said temperature T₂ is between about 1000°

K to about 1500°

K.

6. A process according to claim 1 wherein said sorbent-oxide particles have a mean diameter of about ≦

1.0 um.

7. A process according to claim 1 wherein said fuel mixture is atomized by an atomizing fluid.

8. A process according to claim 1 wherein said hydrocarbon fuel contains sulfur which upon combustion forms a sulfurous by-product effluent in the form of SO_x.

9. A process according to claim 8 wherein said fuel mixture has a Ca to S ratio of up to 2.5.

10. A process according to claim 9 wherein at least 35% by weight of said sorbent is utilized in sulfur absorptions so as to obtain a sulfur reduction in the amount of at least 21% when compared to sorbent-free combustion processes.

11. A process according to claim 10 wherein said sorbent utilization is greater than 50%.

12. A process according to claim 8 wherein said fuel mixture has a Ca to S ratio of between about 0.6 to 1.2.

13. A process according to claim 1 further including the step of feeding additional oxidant to said gaseous stream downstream of said combustion zone.

14. A process according to claim 13 wherein said combustion zone is fed with between about 60 to 95% of total oxidant and said gaseous stream downstream of said combustion zone is fed with between about 5 to 40% of total oxidant.

15. A process according to claim 13 wherein said combustion zone is fed with between about 80 to 90% of total oxidant and said gaseous stream downstream of said combustion zone is fed with between about 10 to 20% of total oxidant.

16. A process according to claim 13 wherein said oxidant is fed to said combustion zone and to said gaseous stream in a total amount greater than the stoichiometric ratio with said hydrocarbon fuel.

17. A process according to claim 16 wherein said combustion zone is fed with between about 60 to 95% of total oxidant and said gaseous stream downstream of said combustion zone is fed with between about 5 to 40% of total oxidant.

18. A process according to claim 1 wherein said oxidant is fed to said combustion zone in at least the stoichiometric ratio with respect to said hydrocarbon fuel.

19. A process according to claim 1 further including admixing a sorbent solubility enhancing compound in said aqueous solution forming step.

20. A process according to claim 19 wherein said effluent sorbent compound is selected from the group consisting of Ca(OH)₂, CaO and mixtures thereof.

21. A process according to claim 19 wherein said sorbent solubility enhancing compound is selected from the group consisting of sucrose, glycerol, alcohols and mixtures thereof.

22. A process according to claim 1 wherein said promoter is selected from the group consisting of salts of Fe, Cu, Mn, B and mixtures thereof.

23. A process according to claim 1 wherein said promoter is selected from the group consisting of salts of Fe, Cu and mixtures thereof.

24. A process according to claim 1 wherein the molar ratio of sorbent to effluent is between about 0.6 to 1.2.

25. A process according to claim 24 wherein the molar ratio of promoter to sorbent is between 0,001 to 0.1.

26. A process for the in-situ production of an effluent sorbent-oxide aerosol during the combustion of a hydrocarbon containing fuel whereby effluents are removed from the resultant gaseous hydrocarbon combustion stream comprising:

(1) providing a hydrocarbon containing fuel;

(2) forming an aqueous solution comprising an effluent sorbent compound selected from the group consisting of CaCl₂, Ca(NO₃)₂, Ca(CH₃ COO)₂, Ca(C₂ H₅ COOH)₂, Ca(CHOO)₂, Ca(OH)₂, CaO and mixtures thereof and a promoter selected from the group consisting of salts of Fe, Cu, Mn, B, Al, Na, K, P, V, Zn, Ni and mixtures thereof dissolved in water;

(3) separately feeding and atomizing said hydrocarbon fuel and aqueous solution to a combustion zone wherein said fuel and solution are admixed;

(4) combusting said fuel mixture in said combustion zone under controlled temperature conditions T₁ wherein T₁ is between about 1525°

K to about 2450°

K in the presence of an oxygen containing oxidant so as to obtain a calcium sorbent-oxide aerosol with promoter comprising ultra-fine sorbent-oxide particles having a mean diameter of less than 1.5 um in said gaseous combustion stream; and

(5) cooling said gaseous combustion stream to a temperature T₂ wherein T₂ is between about 700°

K to about 1500°

K so that said calcium sorbent-oxide particles absorb said effluents from said gaseous combustion stream.