Heating – Work chamber having heating means – Heating tube – element – or flue traverses work space
Patent
1981-02-17
1982-10-26
Camby, John J.
Heating
Work chamber having heating means
Heating tube, element, or flue traverses work space
126 91A, F27B 514, F24C 300
Patent
active
043559735
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a radiant heating apparatus, and more particularly to a heating apparatus employing a radiant heating tube and a regenerator system.
BACKGROUND ART
Regenerative heat exchangers and recuperators have been commonly used in high temperature furnaces such as glass furnaces (Bradley et al. U.S. Pat. No. 4,174,948), open hearth furnaces (Tourville U.S. Pat. No. 2,046,419), and coke ovens (Otto U.S. Pat. No. 2,868,277). See also Webber U.S. Pat. No. 3,223,135, which refers to the common practice of cyclically reversing the flow of air and the supply of fuel to burners so that, after one half cycle when the furnace is first started up, the combustion air always passes over hot regenerator elements. More recently, regenerative heat exchangers have been used in gas turbine engines (Penney et al. U.S. Pat. No. 3,978,912).
The regenerator of U.S. Pat. No. 3,978,912 was especially engineered for use in automotive gas turbine engines, and thus had to be quite compact. Regenerators used in furnaces, on the other hand, have generally been large and required substantial, heavily insulated regenerators outside the furnace chamber. Such structures are not acceptable in modern manufacturing facilities where space is at a premium, and where furnaces must be used for such purposes as heat treating metal parts. Relatively compact radiant heating furnaces for this purpose are known to the prior art, but applicant knows of no recuperator or regenerator system applicable to such furnaces that does not greatly increase the space occupied by the furnace.
The foregoing illustrates problems of the known prior art. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, a radiant heating apparatus is of the type which has walls defining a chamber to be heated, a tube in the chamber with first and second end portions extending through the chamber wall, a fluid fuel burner in the tube, air inlet means through which combustion air is supplied to the burner, and combustion gas outlet means through which combustion products from the tube pass. The apparatus is supplied with a regenerator system which has first and second regenerator cores in the first and second end portions of the tube, and each of the regenerator cores has a large surface area over which gases may flow freely. First and second fluid fuel burners are immediately adjacent the inner ends of the respective first and second regenerator cores, and cycling means of the general type discussed in the Webber patent is provided to control airflow and combustion. The cycling means causes air from the inlet means to flow through the first regenerator core and fuel to be supplied only to the first fluid fuel burner to operate that burner, thereby producing hot combustion products which heat the second regenerator core as they pass to the stack. The cycling means then causes the air from the inlet means to flow through the heated second regenerator core and fuel to be supplied only to the second fluid fuel burner to operate that burner, thereby producing hot combustion products which heat the first regenerator core as they pass to the stack.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary sectional view of a first embodiment of a radiant heating apparatus supplied with the regenerative system of the present invention;
FIG. 2 is a fragmentary sectional view taken substantially as indicated along the line II--II of FIG. 1;
FIG. 3 is a fragmentary sectional view of a second embodiment of the invention;
FIG. 4 is a fragmentary sectional view of a third embodiment of the invention designed particularly for use with low BTU producer, or coal gas; and
FIG. 5 is a diagrammatic view of the cycling means which controls airflow and combustion.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to the drawings in detail, and referring first to FIGS. 1 and 2, a radiant heating app
REFERENCES:
patent: 2046419 (1936-07-01), Tourville
patent: 2399609 (1946-04-01), Wainer
patent: 2868277 (1959-01-01), Otto
patent: 2946651 (1960-07-01), Houdry
patent: 3223135 (1965-12-01), Webber
patent: 3978912 (1976-09-01), Penny et al.
patent: 4174948 (1979-11-01), Bradley et al.
Camby John J.
Caterpillar Tractor Co.
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