Liquid heaters and vaporizers – Stand boiler – Fluid fuel burner
Patent
1991-07-22
1993-04-06
Favors, Edward G.
Liquid heaters and vaporizers
Stand boiler
Fluid fuel burner
122 14, 122138, 122153, 1224483, 122494, F22B 502
Patent
active
051993848
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a multi-tube once-through boiler and more particularly to a guadrangular type multi-tube once-through boiler unit constructed by constituting a boiler body containing water tube assembly and ancillary devices for boiler such as burner means, exhaust gas discharging means, burner duct and blower in a flat rectangular region, and also to a combined structure for boiler unit for equipping a desired number of these boiler units.
2. Background Art
Generally, it has been considered desirable from the standpoint of increased heat exchange efficiency between combustion gas and water tubes that the water tube assembly used in small-sized multi-tube once-through boilers comprise water tubes annularly disposed to define a combustion chaber therein. Therefore, a multi-tube once-through boiler using this type of water tube assembly has a substantially cylindrically constructed boiler body, with ancillary parts, such as a blower and a water feed pump, disposed around said boiler body.
Another feature of said type of boiler is that the burner is disposed above or below the water tube assembly so that the fuel from the burner burns substantially completely in the interior of the water tube assembly, producing high temperature combustion gases which flow through clearances between the water tubes and into flues. In a boiler using the water tube construction described above, since the ancillary parts are disposed around the boiler body, the boiler installation area is several times as large as that occupied by the boiler body.
Thus, the boiler employing the burner-based combustion system described above together with the cylindrical water tube construction tends to occupy a relatively large installation space depending upon the boiler installation cite and layout condition. For this reason, some multi-tube once-through boilers based on the so-called quadrangular type water tube construction have recently been proposed. In these known quadrangular type multi-tube once-through boilers, the water tube assembly is simply constructed to define an oval or rectangle which provides a relatively large space serving as a combustion chamber; because of this construction, the reduction of the boiler body size has been limited, making it difficult to attain a sufficient saving of installation space.
In recent years, attention has been paid to environmental pollution problems, calling for further reduction of harmful combustion exhaust gases, particularly NO.sub.x and CO gases, from boilers.
Approaches to reduction of such harmful combustion exhaust gases include a method in which exhaust gases are re-circulated, another in which water is sprayed over premixed gas, a so-called two-stage combustion method, and a method in which the combustion gas temperature is adjusted by a cold body adjacent the burner and then CO is oxidized in an adiabatic space extending to the heat exchanger. Even if these approaches to reduction are applied to conventional boilers, the problems of increasing boiler size and complicated boiler construction still remain, leading to an increase in cost.
This invention is a novel boiler unit overcoming the problems described above, intended to provide a novel small-sized efficient quadrangular type multi-tube once-through boiler designed so that the boiler body and ancillary parts, such as a blower, can be installed in a limited rectangular parallelepiped space.
Another object of the present invention is to provide a novel combustion system in which it has a minimum space of the combustion chamber for constituting such a boiler of small size and high efficiency and substantial combustion of the fuel is carried out in the space between the water tubes.
Another object of the present invention is to provide a novel package type boiler which is equipped by a plurality of the above-mentioned boilers of small size and high efficiency as a preferred embodiment of the present invention.
Other objectives and examples of application of the present invention will be clarif
REFERENCES:
patent: 4413590 (1983-11-01), Landreau
patent: 4499859 (1985-02-01), Nishiguchi et al.
patent: 4685426 (1987-08-01), Kidaluski et al.
patent: 5040470 (1991-08-01), Lofton et al.
Kayahara Toshihiro
Shibakawa Sadayoshi
Tai Seiji
Favors Edward G.
Miura Co., Ltd.
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