GB2119076A - Fuel gasifying burner - Google Patents

Abstract

A burner includes a combustion device (8) located below a gas generating member (1) housing a fuel supply device (7), a plurality of combustion members with flame apertures (5) are arranged on either side of the member (1) substantially in the same horizontal plane (2) or in a plane below that of the gas generating member and maintained in communication with member (1). The combustion member may be of annular form and located below member 1, or of a doughnut shape. Actuation of device (8) first allows member (1) and members (2) to be preheated to a fuel gasifiable temperature and then permits member (1) to be heated by flames formed by combustion of gasified fuel ejected through the apertures (5) of the combustion members. <IMAGE>

Description

SPECIFICATION Fuel gasifying burner This invention relates to a fuel gasifying burner capable of quickly changing a supply of liquid fuel to a gaseous state so that gasification of the supply of liquid fuel and combustion thereof by forming a mixture with air can be carried out continuously over a prolonged period of time.

This invention has as its object the provision of a fuel gasifying burner of novel construction enabling combustion of liquid fuel in the form of gasified fuel to be initiated quickly at early stages of burner operation and smoothly continued thereafter during the entire period of burner operation.

The outstanding characteristic of the invention is that the liquid fuel gasifying burner comprises a gas generating member, at least one combustion member, fuel supply means mounted in the gas generating member and combustion means located below a portion of the gas generating member in which the fuel supply means is located to preheat the gas generating member and the combustion member from outside, whereby the gas generating member and the combustion member can be quickly preheated without causing combustion loss thereto. Preheating of the gas generating member and the combustion member can be quickly achieved with flames of combustion of liquid fuel in good condition, so that combustion of the liquid fuel in a gasified state can be started at early stages of burner operation and continuously carried out over a prolonged period of time in a satisfactory condition.

Additional and other objects, features and advantages of the invention will be apparent from the description set forth hereinafter when considered in conjunction with the accompanying drawings, in which: Figure 1 is a side view of the fuel gasifying burner comprising a first embodiment of the invention, with certain parts being broken away; Figure2 is a sectional view taken along the line ll-ll in Figure 1; Figure 3 is a plan view of the fuel gasifying burner shown in Figure 1; Figure 4 is a vertical sectional front view of the fuel gasifying burner comprising a second embodiment; Figure 5 is a plan view, with certain parts being cut out, of the fuel gasifying burner comprising a third another embodiment; Figure 6 is a sectional view taken along the line VI-VI in FigureS;; Figure 7 is a front view of the fuel gasifying burner comprising a fourth embodiment; and Figure 8 is a sectional view taken along the line VIII-VIII in Figure 7.

Preferred embodiments of the invention will now be described by referring to the accompanying drawings.

In Figures 1-3, a gas generating member 1 is connected at its base to an air blowing cylinder, not shown. A plurality of combustion members 2 of elongated cylindrical shape to enable a mixture of gasified fuel and air to burn in a gasified state are each arranged on either side of the gas generating member 1 in spaced apart relation in substantially the same horizontal plane. The elongated combustion members 2 are closed at its forward end 2' to provide a gas chamber 3 in each of the combustion members 2 and connected at its base 2" to a communicating member 4 which in turn is connected to a forward end of the gas generating member 1.The combustion members 2 are formed with a multiplicity of slit-like flame apertures 5 on the upper half surface portion and the portion thereof facing the gas generating member 1 and have flame directing plates 6 attached to the outer peripheral portion thereof having no flame apertures 5. The flame directing plates 6 each include projections extending upwardly and downwardly for directing the flames toward the gas generating member 1 in a stable fashion.

The flame apertures 5 of the combustion members 2 may be of any suitable form other than the slits, such as small circular apertuers. The numeral 7 designates fuel supply means housed inside the gas generating member 1 at the base thereof. In the embodiment shown and described herein, the fuel supply means 7 ejects fuel in atomized particles through a nozzle at its forward end. However, the invention is not limited to this specific manner of fuel supply and the fuel supply means 7 may merely have an opening at its forward end to allow the liquid fuel to be fed in droplets into the interior of the gas generating member 1.The numeral 8 designates combustion means located beneath a portion of the gas generating member 1 in which the fuel supply means 7 is housed and comprising an air feeding line 9 for supplying combustion air, a nozzle 10 for supplying a spray of liquid fuel, and an ignition plug 11 for starting combustion. The combustion means 8 is operative to obtain combustion of both liquid fuel and gaseous fuel.

In the first embodiment shown in Figures 1 and 2, the elongated combustion members 2 are arranged on both sides of the gas generating member 1 substantially in the same horizontal plane. The invention is not limited to this specific arrangement of the members 1 and 2 and the elongated combustion members 2 may be located, as shown in Figure 4 as a second embodiment, in positions obliquely downwardly of the gas generating member 1 on both sides thereof as indicated at 2A. In the second embodiment, the combustion means 8 is interposed between the combustion members 2A to enable better preheating effects to be achieved.

Figures 5 and 6 show a third embodiment in which the single combustion member 2B is arranged in annular form as seen in a plan view and maintained in communication with the forward end of the gas generating member 1 at its lower portion, so that the flames of combustion for obtaining fuel gasification can be directed upwardly from below. In this embodiment, to enable preheating of the gas generating member 1 and combustion member 2B as a whole to be efficiently achieved with the flames of combustion of liquid fuel carried out by the combustion means 8, a cutout flame passage 12 is formed in a portion of the combustion member 2B located on the side of the base 1' of the gas generating member 1 positioned against the combustion means 8 to allow the flames of combustion of the liquid fuel to extend therethrough.The annular combustion member 2B is formed at its upper half portion with flame apertures 5' and has a flame directing plate 6' arranged at the outer circumference thereof.

Figures 7 and 8 show a fourth embodiment in which the single combustion member 2C is in the form a doughnut to allow the flames of combustion to obtain gasification of the fuel to be directed forwardly. The doughnut-shaped combustion member 2C is arranged on its side so that the gas generating member 1 located horizontally may extend substantially through the center opening of the combustion member 2C. In this embodiment, the gas generating member 1 is maintained in communication with the combustion member 2C through a communicating member 4", and the combustion member 2C is formed with a multiplicity of flame apertures 5" at its surface.

Operation of the fuel gasifying burner according to the invention will be described. When it is desired to obtain combustion of liquid fuel in gasified form by the fuel gasifying burner shown in Figures 1-3,airfor combustion is forcedly fed in the direction of arrows through the air feeding line 9 and at the same time fuel is ejected in atomized particles through the nozzle 10. A current is passed to the ignition plug 11 to actuate the combustion means 8. Actuation of the combustion means 8 enables complete combustion of the fuel to be achieved to produce flames by the combustion of the liquid fuel which preheats the gas generating member 1 and the combustion members 2 from outside. Thus the members 1 and 2 can be heated in a short period of time to a temperature high enough to obtain gasification of the liquid fuel.

When the gas generating member 1 and combustion members 2 are preheated to a liquid fuel gasifiable atmosphere temperature, a supply of liquid fuel is fed to the base end 1' of the gas generating member 1 and at the same time the air for combustion is fed in jet streams in the direction of arrows. While flowing through the preheated gas generating member 1, the supply of liquid fuel and the combustion air are quickly gasified and mixed with each other following agitation to form a fuel-air mixture which flows through the communicating member 4 into the combustion members 2.After being thus forced into the combustion members 2 and staying therein for an instant, the fuel-air mixture is ejected in jets through the flame apertures 5 under a predetermined pressure and ignited by the flames of combustion of the liquid fuel from the combustion means 8 to form flames of combustion of the gaseous fuel. Thus the fuel burns in gasified form and heats the gas generating member 1 from outside. When heating of the gas generating member 1 can thus be carried out by the flames of combustion of the liquid fuel in gasified form, heating of the gas generating member 1 can be efficiently achieved with the flames of combustion of the fuel in gasified form even if the combustion means 8 is de-actuated.Thus the fuel-air mixture can be obtained in volumes large enough to enable combustion of the fuel in gasified form to be continuously carried out in good condition, so long as the supply of liquid fuel by the fuel supply means 7 and the ejection of the air for combustion through the air feeding line 9 are not interrupted.

Like the first embodiment shown in Figures 1-3, the second, third and fourth embodiments shown in Figures 4-7 operate to efficiently generate a mixture of gasified fuel with air by preheating the gas generating member with the flames of combustion of the liquid fuel directed either upwardly or forwardly.

From the foregoing description, it will be appreci atedthatthefuel gasifying burner according to the invention is provided with combustion means 8 located below a portion of the gas generating member 1 and combustion members 2, 2A, 2B and 2C. By virtue of this constructional feature, it is possible to quickly preheat the gas generating member and the combustion members to a fuel gasifiable temperature to initiate combustion of the fuel in gasified form at early stages of burner operation while avoiding the production and deposition of soot due to incomplete fuel combustion in the gas generating member and combustion members, no matter how often the operation of burning the liquid fuel to obtain combustion of the fuel in gasified form may be carried out. In addition, the invention enables production of a mixture of gasified fuel with air in a complete form to be carried out in continuous operation and at the same time prevent from being damaged bytheflameofconbustion of the gas generating member 1 and combustion members 2, 2A, 2B and 2C to enable combustion of the fuel in gasified form to be carried out continuously over a prolonged period of time.

Claims (6)

1. A fuel gasifying burner comprising: a gas generating member allowing a mixture of gasified fuel with airtoflowtherethrough; at least one combustion member located in the same horizontal plane beside said gas generating member or in a plane below that of said gas generating member and maintained in communication therewith, said combustion member being formed with a gas chamber therein and a multiplicity of flame apertures at its surface; fuel supply means housed in a portion of said gas generating member near its base for directing a supply of liquid fuel toward the interior of said gas generating member; and combustion means located below a portion of said gas generating member housing said fuel supply means for preheating said gas generating member and combustion member from outside, said combustion means comprising an air feeding line, a liquid and/or gas fuel spray nozzle and an ignition plug.

2. A fuel gasifying burner as claimed in claim 1, wherein said fuel supply means comprises a nozzle for ejecting fuel in atomized particles.

3. A fuel gasifying burner as claimed in claim 1, wherein said fuel supply means comprises a tubular member having an opening at its forward end.

4. Afuel gasifying burner as claimed in claim 1, wherein said at least one combustion member is in elongated cylindrical form.

5. Afuel gasifying burner as claimed in claim 1, wherein said at least one combustion member is annular in form and arranged beneath said gas generating member to communicate therewith, said combustion member being formed with a cutout flame passage at a portion thereof on the base side of said gas generating member.

6. Afuel gasifying burner as claimed in claim 1, wherein said at least one combustion member is in the form of a doughnut and said gas generating member is arranged to extend through substantially the center opening of said combustion member, and further comprising a communicating member for communicating the gas generating member with the combustion member.