US 3,980,422 AGranted

Oil injection means for liquid fuel burner

AssigneeHED Industries, Inc.

InventorJohn S. Dennis

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Abstract

A burner for burning gasified liquid fuel such as oil, in which the fuel is gasified by being mixed with hot burned gases drawn from the combustion chamber, is provided in which the normal thermal stresses found in such burners due to the return of the hot burned gases for gasifying are substantially reduced and, at the same time, start-up time is reduced. Minimization of the thermal stresses is accomplished by utilizing the heat of vaporization of the oil or other fuel to cool the hot returning gases, and so limit thermal expansion, by having the gasification of the fuel commence at a pre-selected adjusted distance from the hot gas outlet of the burner, according to the particular application and ambient conditions in which the burner is installed. This permits elimination of a gasification chamber, which in some cases has been required to provide a preheating area for the oil, and so further reduces stresses. With such elimination, rapid start-up is provided by preliminarily burning ungasified fuel introduced by the air and fuel system of the principal unit. At the same time, maximum combustion efficiency is achieved through the capability of adjustable positioning of the point of injection of the fuel into the recycled hot burned gases.

Claims8

Dependent claims

In a liquid fuel burner for burning a gasifiable liquid fuel such as oil and having reduced thermal stresses, said burner being of the type including

a burner made of refractory material and having a fire chamber, said chamber having a fuel mixture inlet port, a burned gas removal port, and a hot burned gas feedback port,
a mixing chamber for mixing said fuel and air, said mixing chamber being connected to said inlet port,
a burned gas and fuel inlet to said mixing chamber,
means directly interconnecting said burned gas removal port to said burned gas and fuel inlet,
an air inlet to said mixing chamber for directing air under pressure into said mixing chamber, said air inlet including a Venturi for drawing burned gas and fuel into said chamber through said interconnecting means and said burned gas and fuel inlet, and
a gasifiable liquid fuel inlet connected to said interconnecting means proximate to said refractory material,
whereby said fuel will be gasified by hot burned gas as it passes through said interconnecting means and the heat of vaporization of said fuel will cool said hot burned gases, thereby reducing the temperatures thereof and reducing thermal stresses therein, the improvement comprising means for adjusting the position of said liquid fuel inlet longitudinally of the interconnecting means, toward and away from said refractory material.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/602,601Filed 11 Aug 1975
Granted: 14 Sep 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F23D 11/005
Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space: with combinations of different spraying…
F16H 37/00
Combinations of mechanical gearings, not provided for in groups f16h1/00 - f16h35/00
F23C 9/00
Combustion apparatus characterised by arrangements for returning combustion products or flue gases
F16H 2700/02
Transmission housings and mounting of transmission components therein; Cooling; Lubrication; Flexible suspensions, e.g. floating frames:…