US 5,680,822 AGranted

Solid fuel burner

OwnerJorgen Hallberginventor

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Abstract

A solid fuel burner mountable on a boiler furnace. The forward portion of the burner is insertable through an opening in the casing of the furnace so as to extend into the furnace's combustion zone. The burner includes a tubular main body accommodating a feed screw for the solid fuel. The free end of the screw terminates in the forward portion of the burner. The other, closed end of the burner is mounted rotatably in a bearing. A drive rotates the feed screw inside the main body. An ignition chamber is disposed at the forward end portion. One open end of the ignition chamber meets up with the main body and the feed screw terminating within the chamber. An air supply duct with its delivery end in the chamber supplies combustion air to the fuel. An inlet in the main body gives access to the screw and thus permits the supply of fuel from a solid fuel container to the feed screw.

Claims11

Dependent claims

A burner for solid fuel, intended for mounting on a boiler furnace having a furnace casing, the burner having a forward portion being insertable through an opening in the furnace casing and extending into a combustion zone of the furnace, the burner including a tubular main body accommodating a feed screw for the fuel, a free end of the screw terminating in the forward portion and its other, closed end being rotatably mounted in a bearing, a drive means for rotating the feed screw inside the body, an ignition chamber disposed at the forward portion of the burner body with the feed screw end and an air supply duct terminating in the chamber for supplying primary air for ignition and combustion of the fuel, and an inlet in the main body for access to the feed screw for delivering solid fuel from a fuel container to the feed screw,

wherein the air supply duct for primary combustion air is formed in, and extends through the center of the feed screw and terminates inside the ignition chamber;
and
wherein a free forward end of the air supply duct and the feed screw As in the form of a cone converging in a forward direction, with a curved surface having obliquely, forwardly directed ducts with exit holes for primary combustion air.

A burner for solid fuel, intended for mounting on a boiler furnace having a furnace casing, the burner having a forward portion insertable through an opening in the furnace casing and extending into the combustion zone of the furnace, the burner including a tubular main body accommodating a feed screw for the fuel a free end of the screw terminating in the forward portion and its other, closed end being rotatably mounted in a bearing, a drive means for rotating the feed screw inside the body, an ignition chamber disposed at the forward portion of the burner body with the feed screw end and an air supply duct terminating in the chamber for supplying primary air for ignition and combustion of the fuel, and an inlet in the main body for access to the feed screw for delivering solid fuel from a fuel container to the feed screw.

wherein the air supply duct for primary combustion air is formed in, and extends through the center of the feed screw and terminates inside the ignition chamber;
and
wherein along a curved surface the body of the ignition chamber has at least one duct for secondary air which, in a preheated state and assisted by a blower can be fed out from exit openings in the forward portion of the ignition chamber, the secondary air and the primary combustion air supplied via the air supply duct being adjustable for regulation of the temperature in the ignition chamber.

Dependencies are inferred from the claim text.