Atomization burners

Claim 2

An atomizing burner of the type having a combustion chamber, an atomizing element made of porous, heat resistant material arranged in the combustion chamber, means for supplying fuel to the combustion chamber via the atomizing element, and electric ignition means arranged to heat, vapourize and ignite the fuel to initiate the process of combustion, the atomizing element having an auxiliary chamber and a main chamber which communicate through a constricted connecting line and together therewith form a flow passage through the atomizing element, and means including first supply openings being provided for feeding a first part flow of combustion air to the combustion chamber via the passage and further means including second supply openings for supplying a second part flow of combustion air to said combustion chamber, the size ratio of the connecting line and said first openings to said second supply openings being a first predetermined value sufficient to sustain combustion in the auxiliary chamber when the burner is started up and during continued running of the burner characterized in that the size ratio of the constricted connecting line and said first openings to said second openings are a second predetermined value less than said first predetermined value to an extent that the first part flow is sufficiently large to sustain combustion in the axuiliary chamber when the burner is started up, but insufficient to sustain any form of combustion in said auxiliary chamber during continued running of the burner when the atomizing element in its entirety has acquired operation temperature.

Claim 3

A burner according to claim 1, characterized in that the means for supplying the first and second part flows of combustion air to the chamber further includes a common feed passage, and said first supply openings for the first part flow located between said passage and said chamber, and said second supply openings for the second part flow located between the same passage and the combustion chamber.

Claim 4

A burner according to claim 2, characterized in that the through flow area of the first supply openings is fixed.

Claim 5

A burner according to claim 1, characterized in that the ignition means is arranged to be operative during a shut down period of the burner with decreasing supply of fuel thereto.

Claim 6

In an atomizing burner of the type having a combustion chamber, an atomizing element made of porous, heat resistant material arranged in the combustion chamber, means for supplying fuel to the combustion chamber via the atomizing element, and electric ignition means arranged to heat, vaporize and ignite the fuel to initiate the process of combustion, the atomizing element having an auxiliary chamber and a main chamber which communicate through a constricted connecting line and together therewith form a flow passage through the atomizing element, and means including first supply openings provided for feeding a first part flow of combustion air to the combustion chamber via the passage, and further means including second supply openings for supplying a second part flow of combustion air to said combustion chamber, the size ratio of the connecting line and said first openings to said second openings being a first predetermined value sufficient to sustain combustion in the auxiliary chamber when the burner is started up and during continued running of the burner, a method of avoiding contamination as by soot buildup within said auxiliary chamber and in said connecting line comprising the step of reducing the size of said first openings so that the size ratio of the connecting line and the reduced first openings to said second openings are a second predetermined value less than said first predetermined value to the extent that the first part flow is sufficiently large to sustain combustion in the auxiliary chamber when the burner is started up, but insufficient to sustain any form of combustion in said auziliary chamber during continued running of the burner when the atomizing element in its entirety has acquired operation temperature.

Claim 7

In an atomizing burner of the type having a combustion chamber, an atomizing element made of porous, heat resistant material arranged in the combustion chamber, means for supplying fuel to the combustion chamber via the atomizing element, and electric ignition means arranged to heat, vaporize and ignite the fuel to initiate the process of combustion, the atomizing element having an auxiliary chamber and a main chamber which communicate through a constricted connecting line and together therewith form a flow passage through the atomizing element, and means including first supply openings provided for feeding a first part flow of combustion air to the combustion chamber via the passage, and further means including second supply openings for supplying a second part flow of combustion air to said combustion chamber, the size ratio of the connecting line and said first openings to said second openings being a first predetermined value sufficient to sustain combustion in the auxiliary chamber when the burner is started up and during continued running of the burner, a method of avoiding contamination as by soot buildup within said auxiliary chamber and in said connecting line comprising the step of reducing the size of said first openings so that the size ratio of the connecting line and the reduced first openings to said second openings are a second predetermined value less than said first predetermined value to the extent that the first part flow is sufficiently large to sustain combustion in the auxiliary chamber when the burner is started up, but insufficient to sustain any form of combustion in said auziliary chamber during continued running of the burner when the atomizing element in its entirety has acquired operation temperature.