Combustion – Process of combustion or burner operation – In a porous body or bed – e.g. – surface combustion – etc.
Patent
1996-02-20
1999-12-14
Price, Carl D.
Combustion
Process of combustion or burner operation
In a porous body or bed, e.g., surface combustion, etc.
431 11, 431170, 431215, 422182, 13762546, F23D 1400, F01N 310
Patent
active
060009292
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotary distribution valve for changing the flow direction and guiding a fluid such as gas. The invention also relates to a regenerative combustion apparatus using the rotary distribution valve, and its operating method. Finally, the invention relates regenerative heat exchanger using the rotary distribution valve.
BACKGROUND ART
A direct combustion apparatus hitherto employed for removing malodorous substances discharged from a paint plant and other various plants is designed to heat an objective gas to about 800.degree. C., oxidize the malodorous substances, and decompose into odorless carbon dioxide and water. It is known as a deodorizing apparatus and has a wide scope of applications. In addition, it is capable of treating all malodorous substances that are oxidized and decomposed at a high temperature. A drawback of this direct combustion apparatus is its high fuel cost. In other words, the combustion heat of the malodorous substances is lowered as the concentration of the malodorous substances is lowered, which leads to increase of the fuel amount, thereby increasing the cost.
A prior art device which uses a reduced fuel amount and has an exceptional heat recovery rate is disclosed in FIG. 22. First, second, and third columns 1, 2, 3 filled with a heat reserve material such as ceramics are provided. Burners 4, 5 are disposed so that the temperature of the top of each column reaches about 800.degree. C. The objective gas containing malodorous substances is guided into a duct 6, which is linked to the lower part of each column 1, 2, 3 through valves 7, 8, 9. The gas purified through valves 10, 11, 12 is discharged through a duct 13.
During operation, the objective gas from the duct 6 is raised, for example, from the lower part of the second column 2 through the valve 8, and is heat-exchanged. The malodorous substances are oxidized and decomposed by the burner 5. A heat reserve material 14 in the third column 3 is heated to reserve heat. The purified gas is discharged from the duct 13 through the valve 12, and exhausted to the atmosphere. The valves are changed over by a timer, and purging air is supplied from a duct 15 into the lower part of the second column 2 to move the malodorous gas in the second column 2 into the first column 1. The objective gas to be processed next is guided into the lower part of the third column 3 through the valve 9 from the duct 6, and is heated by the heat reserve material 14. The malodorous substances are oxidized and decomposed by the burner 4. The heat reserve material in the first column 1 is heated to exchange heat, and the purified gas is moved into the duct 13. Afterwards, the purging air is further supplied into the lower part of the third column 3 from the duct 15, and is conducted into the second column 2 through the burner 5. The objective gas is supplied into the lower part of the first column 1 through the valve 7 from the duct 6, and heated by the heat reserve material. The malodorous substances are oxidized and decomposed by the burner 4, and the gas purified through the valve 11 from the second column 2 is discharged from the duct 13 together with the air for purge. In this way, sequentially in time by the timer, the objective gas rises through the first to third columns 1, 2, 3, and absorbs the heat from the heat from the heat reserve material 14. The gas heated by the burners 4, 5 descends through the first, second and third columns 1, 2, 3 to heat the heat reserve material 14, so that the heat recovery rate may be enhanced greatly.
A problem of the prior art shown in FIG. 22 is that it requires a total of three large-sized columns 1, 2, 3 for the purpose of purging. Before changing from the heat absorption process of the objective gas into the heat release process, the malodorous gas remaining in the columns 1, 2, 3 without being decomposed must be purged. Although the amount of air necessary for this purge is substantially smaller as compared with the flow rate of the objective gas, the prior
REFERENCES:
patent: 4126419 (1978-11-01), Katabuchi et al.
patent: 5016657 (1991-05-01), Thomason
patent: 5460789 (1995-10-01), Wilhelm
patent: 5562442 (1996-10-01), Wilhelm
Izumo Masanori
Mori Hiroshi
Watanabe Morimasa
Daikin Industries Ltd.
Price Carl D.
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