Autonomous system and method for efficiently collecting fugitive airborne emissions from open vessels
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-019/00
B01D-047/00
C25D-021/11
C25D-017/00
출원번호
US-0224232
(2002-08-20)
발명자
/ 주소
Hay, Kent James
Qi, Shaoying
출원인 / 주소
The United States of America as represented by the Secretary of the Army
대리인 / 주소
Baugher, Jr Earl H.
인용정보
피인용 횟수 :
1인용 특허 :
3
초록▼
An autonomous pushed liquid recirculation system (APLRS) is installed in a vessel, such as an electroplating tank. It situates around the interior perimeter and adjusts to changes in the level of liquid, maintaining the same location and orientation respective to the liquid's surface. It establishes
An autonomous pushed liquid recirculation system (APLRS) is installed in a vessel, such as an electroplating tank. It situates around the interior perimeter and adjusts to changes in the level of liquid, maintaining the same location and orientation respective to the liquid's surface. It establishes a current near the surface that pushes liquid across the narrow horizontal dimension of the tank from a front wall to a rear wall. The current serves to push any bubbles resultant from operations within the tank to the rear wall. Over the rear wall is mounted an abbreviated exhaust hood covering only a short width of the surface of the tank along the rear wall. Because the exhaust system has to scavenge only a portion of the surface since all bubbles now burst along the rear wall, a much smaller air handling apparatus may be specified with an attendant savings in energy costs.
대표청구항▼
1. An autonomous system for collecting fugitive emissions resulting from bubbles bursting on the top surface of a liquid contained in a vessel open to the atmosphere, the perimeter of said vessel consisting of at least a front and a back portion, comprising:a liquid distribution apparatus suspended
1. An autonomous system for collecting fugitive emissions resulting from bubbles bursting on the top surface of a liquid contained in a vessel open to the atmosphere, the perimeter of said vessel consisting of at least a front and a back portion, comprising:a liquid distribution apparatus suspended in said liquid at a pre-specified depth and located adjacent at least part of the inside perimeter of said vessel, said apparatus comprising at least one pipe and pipe connections assembled to permit a distribution of at least a portion of said liquid near said surface, said distribution initiated along said front portion and oriented toward said back portion, said apparatus further assembled to collect at least a portion of said liquid along said back portion,wherein said pipe and pipe connections are connected to at least one pump in such a manner as to effect a system for circulating said liquid in said vessel, andwherein said apparatus establishes a flow along said top surface from said front portion to said back portion such that said bubbles are pushed to an area near said back portion; andflotation support for said liquid distribution apparatus, wherein said support enables said apparatus to maintain a constant orientation with respect to said top surface. 2. The autonomous system of claim 1 further comprising at least one pump. 3. The autonomous system of claim 1 in which said flotation support is provided along said front portion and said back portion in like manner. 4. The autonomous system of claim 1 in which said vessel is rectangular, said front and back portions consisting of front and back walls respectively, said front and back walls extending the longest dimension of said vessel in a horizontal plane, and having end walls, each with a narrowest dimension of said vessel in a horizontal plane. 5. The autonomous system of claim 4 in which said apparatus is installed adjacent said front and back walls and one said end wall. 6. The autonomous system of claim 1 further comprising an abbreviated exhaust hood. 7. The autonomous system of claim 1 in which said apparatus accomplishes said flow via provision of first and second sets of holes in a topmost portion of said apparatus, at least one portion of said topmost portion of said apparatus established at a pre-specified distance from said top surface, said holes pre-specified as to number, location, arrangement and orientation with respect to said vessel,wherein movement of said liquid through said first set of said holes establishes said flow, andwherein return of said liquid to be re-circulated is accomplished via said second set of holes. 8. The autonomous system of claim 7 in which said first set of holes is oriented away from said front portion and aligned at a pre-specified upward angle with the horizontal, the center of said holes in said first set located at a depth below said surface between about 12.5 mm (0.5 in.) and 63.5 mm (2.5 in.). 9. The autonomous system of claim 8 in which said pre-specified upward angle is between about 0° and 30°. 10. The autonomous system of claim 8 in which said pre-specified upward angle is about 15° and said centers of said holes in said first set are located at a depth below said surface between about 25.4 mm (1.0 in.) and 63.5 mm (2.5 in.). 11. The autonomous system of claim 8 in which said pre-specified upward angle is about 15° and said centers of said holes in said first set are located at a depth below said surface between about 25.4 mm (1.0 in.) and 37.5 mm (1.5 in.). 12. The autonomous system of claim 7 in which said second set of holes is oriented away from said rear portion and aligned at a pre-specified upward angle with the horizontal, the center of said holes in said second set located at a depth below said surface between about 152 mm (6.0 in.) and 254 mm (10.0 in). 13. The autonomous system of claim 12 in which said pre-specified angle is between about 30° and 60°. 14. The autonomous syst em of claim 13 in which said pre-specified angle is about 45° and said center of said holes in said first set are located at a depth below said surface of about 152 mm (6.0 in.). 15. The autonomous system of claim 1 in which said flow is established at a rate between about 40-200 lpm/m 2 (1.0-5.0 gpm/ft 2 ) of area of said surface. 16. The autonomous system of claim 1 in which said flow is established at a rate of about 120 lpm/m 2 (3.0 gpm/ft 2 ) of area of said surface. 17. A method for efficiently controlling fugitive emissions from bubbles appearing on the surface of a liquid within a vessel having at least a front and a back wall opposite said front wall, said vessel open to the atmosphere, comprising:establishing a cross flow of said liquid near said surface and across a narrowest horizontal dimension of said surface, said cross flow to initiate adjacent to said front walls, said front wall defined as that said wall at which said cross flow is established;collecting at least a portion of liquid resultant from said cross flow rebounding from said back wall;recirculating said collected liquid to maintain said cross flow; andcollecting any fugitive emissions resultant from any said bubbles that burst via an exhaust hood adjacent to and above said back wall,wherein, as said bubbles reach said surface, said cross flow pushes said bubbles in said liquid across said surface from said front wall towards said back wall. 18. A device at least partially open to the atmosphere and incorporating an autonomous system for collecting fugitive emissions resulting from bubbles bursting on the top surface of a liquid contained in said device, a perimeter of said device consisting of at least a front and a back portion, comprising:a container for holding said liquid;a liquid distribution apparatus suspended in said liquid within said container at a pre-specified depth and located adjacent at least part of the inside perimeter of said device, said apparatus comprising at least one pipe and pipe connections assembled to permit a distribution of at least a portion of said liquid near said surface, said distribution initiated along said front portion and oriented toward said back portion, said apparatus further assembled to collect at least a portion of said liquid along said back portion,wherein said pipe and pipe connections are connected to at least one pump in such a manner as to effect a system for circulating said liquid in said vessel, andwherein said apparatus establishes an approximately horizontal flow along said top surface from said front portion to said back portion such that said bubbles are pushed to an area near said back portion; andflotation support for said liquid distribution apparatus, wherein said support enables said apparatus to maintain a constant orientation with respect to said top surface. 19. The device of claim 18 in which said device is an electroplating tank.
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