IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0939284
(1992-09-01)
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발명자
/ 주소 |
- McAnespie Donald I. (Tecumseh CAX)
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출원인 / 주소 |
- Moco Thermal Industries, Inc. (Romulus MI 02)
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인용정보 |
피인용 횟수 :
11 인용 특허 :
0 |
초록
▼
An improved regenerative thermal oxidizer (“RTO”) and improved method of operating same in order to provide a substantially steady-state flow of contaminant-laden air into the RTO. The RTO includes an automatically-operated balancing valve structure for minimizing pressure variations experienced at
An improved regenerative thermal oxidizer (“RTO”) and improved method of operating same in order to provide a substantially steady-state flow of contaminant-laden air into the RTO. The RTO includes an automatically-operated balancing valve structure for minimizing pressure variations experienced at the inlet of the RTO. The balancing valve is connected to and provides a selectively closeable bypass path for air flow between the high pressure and low pressure sides of an exhaust fan. The balancing valve opens the bypass path whenever flush valves of the RTO are all closed. The RTO further includes a hydraulic control system for minimizing variations in the operation of the RTO due to varying ambient or seasonal temperature conditions to which the RTO may be subjected. The RTO additionally includes a gravity-actuated damper valve structure near the top of a vertically arranged exhaust stack. The damper valve automatically prohibits entry of a stream of cold air into the exhaust stack, while automatically allowing heated processed air to escape the exhaust stack. The RTO is operated according to an improved six-step sequence which provides for the substantially steady-state inlet air flow, due to highly stable air draw rates. The six-step sequence maintains mass air flow rates constant, even though the inlet and outlet valves to the heat exchange chambers of the RTO are opening and closing, and produce periodic air flow reversals within the heat exchange chambers. During the six-step sequence, the steady-state flow is also maintained by opening and closing the balancing valve in a way which counteracts the effects of stopping and starting the flushing gases which are periodically circulated through the heat exchange chambers.
대표청구항
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An improved regenerative thermal oxidation (“RTO”) apparatus for purifying a contaminated source of air of the type including (1) at least first, second, and third heat exchange chambers, each chamber having a first end and a second end and containing refractory heat exchange media through which the
An improved regenerative thermal oxidation (“RTO”) apparatus for purifying a contaminated source of air of the type including (1) at least first, second, and third heat exchange chambers, each chamber having a first end and a second end and containing refractory heat exchange media through which the contaminated air may be drawn; (2) an exhaust flow structure including an exhaust duct and exhaust fan means connected to the exhaust duct, for pushing processed air into the exhaust duct, thereby creating a low pressure region upstream of the exhaust fan means; (3) an inlet flow structure having an inlet connectable to a source of contaminated air, and inlet valve means for selectively directing a source of contaminated air to be processed into the first end of each one of the heat exchange chambers at different intervals of time; (4) a flush flow structure connected to and in fluid communication with the exhaust duct and having flush valve means for selectively directing processed air from the flush flow structure to the first end of each one of the heat exchange chambers at different intervals of time; (5) an outlet flow structure connected to the low pressure region of the exhaust fan means and having outlet valve means for selectively directing contaminated air out of the second end of each one of the heat exchange chambers to the outlet flow structure at different intervals of time; and (6) a combustion chamber common to and in fluid communication with the second end of each heat exchange chamber; the improvement being for minimizing pressure variations experienced at the inlet of the inlet flow structure, and comprising: a balancing valve structure, connected between and providing a bypass path for air flow between the flush flow structure and the low pressure region of the exhaust fan means, including balancing valve means for selectively substantially closing the bypass path whenever the flush valve means are directing processed air to one of the heat exchange chambers, and for opening the bypass path whenever the flush valve means are not directing processed air to one of the heat exchange chambers. A method of continuously operating regenerative thermal oxidizer (“RTO”) equipment of the type including an exhaust fan with low and high pressure sides, at least first, second and third heat exchange chambers in fluid communication with an inlet line flow structure having at least first, second and third inlet valves each associated a respective one of the heat exchange chambers, an outlet flow structure in fluid communication with the low pressure side of the exhaust fan and having first, second and third outlet valves each associated with a respective one of the heat exchange chambers, each heat exchange chamber containing heat exchange media through which contaminated air is passed, and a combustion chamber common to and in fluid communication with each of the heat exchange chambers, the method providing a relatively constant flow of contaminated air through the RTO equipment, comprising the steps of: (a) during a first interval of time, directing contaminated air from the inlet flow structure through the first heat exchange chamber, then to the combustion chamber, then to the second heat exchange chamber, and then to the exhaust fan; (b) during a second interval of time following the first interval of time, (1) directing contaminated air from the inlet flow structure through the first heat exchange chamber, then to the combustion chamber, then to the third heat exchange chamber, and then to the exhaust fan, and (2) substantially stopping processed air from flowing through the second heat exchange chamber; (c) during a third interval of time following the second interval of time, directing contaminated air from the inlet flow structure through the second heat exchange chamber, then to the combustion chamber, then to the third heat exchange chamber, and then to the exhaust fan; (d) during a fourth interval of time following the third interval of time, directing contaminated air from the inlet flow structure through the second heat exchange chamber, then to the combustion chamber, then to the first heat exchange chamber, and then to the exhaust fan, and (2) substantially stopping processed air from flowing through the third heat exchange chamber; (e) during a fifth interval of time following the fourth interval of time, (1) directing contaminated air from the inlet flow structure through the third heat exchange chamber, then to the combustion chamber, then to the first heat exchange chamber, and then to the exhaust fan; and (f) during a sixth interval of time following the third interval of time, directing contaminated air from the inlet flow structure through the third heat exchange chamber, then to the combustion chamber, then to the second heat exchange chamber, and then to the exhaust fan, and (2) substantially stopping processed air from flowing through the first heat exchange chamber; and (g) successively repeating steps (a) through (f) in sequence to maintain a relatively steady-state flow of contaminated air through the oxidizer equipment.
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