IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0245608
(2002-09-16)
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발명자
/ 주소 |
- Baldrey, Kenneth E.
- Durham, Michael D.
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| 출원인 / 주소 |
- ADA Environmental Solutions, LLC
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
9 인용 특허 :
99 |
초록
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The present invention discloses a process for removing undesired particles from a gas stream including the steps of contacting an additive containing nitrate and/or nitrite anions with the gas stream; collecting the undesired particles and additive on a collection surface to form an aggregate on the
The present invention discloses a process for removing undesired particles from a gas stream including the steps of contacting an additive containing nitrate and/or nitrite anions with the gas stream; collecting the undesired particles and additive on a collection surface to form an aggregate on the collection surface comprising the additive and undesired particles; and removing the agglomerate from the collection zone. The anions can be compounded with one or more of potassium, sodium, calcium, and aluminum. In a preferred composition, the anion(s) is/are compounded with potassium. The process may be applied to electrostatic precipitators to improve undesired particle collection efficiency.
대표청구항
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1. A process for removing undesired particles from a gas stream, comprising:contacting said gas stream with an additive composition comprising at least one of potassium nitrate and potassium nitrite andcollecting at least a portion of the undesired particles and at least a portion of the additive co
1. A process for removing undesired particles from a gas stream, comprising:contacting said gas stream with an additive composition comprising at least one of potassium nitrate and potassium nitrite andcollecting at least a portion of the undesired particles and at least a portion of the additive composition or a derivative thereof on a collection surface to form on said collection surface an agglomerate comprising the at least a portion of the additive composition and the at least a portion of the undesired particles. 2. The process, as claimed in claim 1, further comprising:removing said agglomerate from said collection surface. 3. The process, as claimed in claim 1, wherein the collection surface has a temperature of at least about 250° C. 4. The process, as claimed in claim 3, wherein the at least a portion of the additive composition comprises a plurality of additive particles and collecting step further comprises:imparting an electrical charge to the undesired particles and additive particles and electrically attracting said electrically charged undesired particles and additive particles to the collection surface. 5. The process, as claimed in claim 1, wherein the at least a portion of the additive composition comprises a plurality of additive particles and said collecting step comprises filtering said undesired particles and additive particles containing said additive composition from said gas stream. 6. The process, as claimed in claim 1, wherein the additive composition comprises potassium nitrate. 7. The process, as claimed in claim 6, wherein said additive composition further comprises a nitrate and/or nitrite compounded with at least one metal other than potassium. 8. The process, as claimed in claim 7, wherein the additive composition, upon contact with the gas stream, comprises at least about 0.5 wt % of potassium nitrate and at least about 0.5 wt % of the nitrate and/or nitrite compounded with at least one metal other than potassium. 9. The process, as claimed in claim 7, wherein the at least one metal other than potassium is at least one of sodium, calcium, and aluminum. 10. The process, as claimed in claim 3, wherein the temperature of said collection surface is greater than the condensation temperature of water and the carrier fluid. 11. The process, as claimed in claim 1, wherein said additive composition comprises potassium nitrite. 12. The process, as claimed in claim 1, wherein the additive composition is in the form of a solid, when contacted with the gas stream. 13. The process, as claimed in claim 1, wherein the additive composition further comprises a solubilizing agent. 14. The process, as claimed in claim 13, wherein the solubilizing agent is a peroxygen compound. 15. The process, as claimed in claim 7, wherein a molar ratio between the at least one of potassium nitrate and potassium nitrite on the one hand and the nitrate and/or nitrite compounded with at least one metal other than potassium on the other ranges from about 0.2:1 to about 2:1. 16. A process, as claimed in claim 12, wherein the solid additive composition comprises at least about 25 wt % of the at least one of potassium nitrate and potassium nitrite. 17. A process, as claimed in claim 1, wherein the additive composition comprises at least about 75 wt. % solvent. 18. A process for removing undesired particles from a gas stream, comprising:contacting said gas stream with a plurality of particles comprising a liquid additive composition including an oxidant and a solubilizing agent; andcollecting at least most of said undesired particles and liquid additive particles on a collection surface to form an agglomerate, wherein the oxidant comprises at least one of a nitrate and nitrite and the at least one of nitrate and nitrite is compounded with potassium. 19. The process, as claimed in claim 18, wherein the liquid additive composition comprises a carrier fluid and wherein the temperature of said collection surface is greater than the condensation temperature of water and the carrier fluid. 20. The process, as claimed in claim 19, wherein said liquid additive particles are in the form of droplets and the droplets have a first Sauter Mean Diameter upon contacting with the gas stream ranging from about 20 to about 150 microns and, after vaporization of the carrier fluid, a second Sauter Mean Diameter ranging from about 1 to about 10 microns and further comprising at least one of the following steps:imparting an electrical charge to the undesired particles and additive particles and electrically attracting said electrically charged undesired particles and additive particles to the collection surface; andfiltering said undesired particles and additive particles containing said additive composition from said gas stream. 21. The process, as claimed in claim 18, wherein the liquid additive composition comprises at least about 10 wt. % of the at least one of a potassium nitrate and potassium nitrite. 22. The process, as claimed in claim 18, wherein the liquid additive composition further comprises a mineral acid. 23. The process, as claimed in claim 18, wherein at least some of the oxidant is compounded with a metal and the metal is at least one of sodium, calcium, and aluminum. 24. The process, as claimed in claim 18, wherein the collection surface has a temperature of at least about 250° C. 25. The process, as claimed in claim 18, wherein the additive composition comprises potassium nitrate. 26. The process, as claimed in claim 18, wherein the additive composition further comprises a solubilizing agent. 27. The process, as claimed in claim 26, wherein the solubilizing agent is a peroxygen compound. 28. A process for conditioning undesired particles in a gas stream, comprising:contacting, with a gas stream comprising undesired particles, an additive composition comprising an oxidant, at least some of the oxidant being compounded with potassium; andimparting an electric charge to the undesired particles and particles of the additive composition; andcollecting the charged undesired particles and additive composition particles on one or more electrically charged surfaces, wherein the oxidant comprises a nitrogen-containing anion selected from the group consisting essentially of a nitrate, a nitrite, and mixtures thereof. 29. The process, as claimed in claim 28, wherein at least some of the nitrogen-containing anion is compounded with a metal selected from the group consisting essentially of sodium, calcium, and aluminum. 30. The process, as claimed in claim 28, wherein at least about 25 mole % of the oxidant is compounded with potassium and the additive composition comprises at least about 10 wt. % of the oxidant. 31. The process, as claimed in claim 28, wherein the oxidant and potassium effect a resistivity reduction in at least some of the collected undesired particles of at least about 50%. 32. The process, as claimed in claim 28, wherein the additive composition is in the form of a liquid and comprises a solubilizing agent. 33. The process, as claimed in claim 32, wherein the solubilizing agent is a peroxygen compound. 34. The process, as claimed in claim 33, wherein the peroxygen compound is a peroxide. 35. The process, as claimed in claim 28, wherein the additive composition, upon contact with the gas stream, comprises at least about 0.5 wt % of potassium nitrate and at least about 0.5 wt % of the nitrate and/or nitrite compounded with at least one metal other than potassium. 36. The process, as claimed in claim 29, wherein the additive composition comprises potassium nitrate. 37. The process, as claimed in claim 29, wherein the additive composition comprises potassium nitrite. 38. A process for removing undesired particles from a gas stream, comprising:contacting said gas stream with a plurality of solid additive particles comprising an oxidant selected from the group consisting essentially of nitrates, nitrites, and mixtures thereof; wherein the pluralit y of particles are in the form of a free-flowing solid powder when contacted with the gas stream and wherein at least some of the oxidant is compounded with potassium; andelectrically collecting at least most of the undesired particles and additive particles on a collection surface to form an agglomerate. 39. The process as claimed in claim 38, wherein at least some of the oxidant is compounded with a metal selected from the group consisting essentially of an element in Groups 1, 2, 6, 7, 8, 9, 10, 11, 12 and 13 of the Periodic Table and mixtures thereof and wherein the particles comprise at least about 25 wt. % of the oxidant. 40. The process, as claimed in claim 38, wherein at least about 80% of the additive particles have a particle size of no more than about 15 microns. 41. The process, as claimed in claim 38, wherein the collection surface has a temperature of at least about 250° C. 42. The process, as claimed in claim 38, wherein the additive particles comprise potassium nitrate. 43. The process, as claimed in claim 38, wherein the additive particles comprise potassium nitrite. 44. The process, as claimed in claim 38, wherein the additive particles further comprise a solubilizing agent. 45. The process, as claimed in claim 44, wherein the solubilizing agent is a peroxygen compound.
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