A biomass burner includes a lateral shell having an axis of main development and a bottom provided in a lower end of the lateral shell to delimit the lateral shell at the lower part in order to internally define a compartment to contain the biomass. The bottom is able to support the biomass inside the containing compartment and is provided with one or more first holes configured for the introduction of primary air into the containing compartment.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.

The invention relates to a combustion device for burning fuel such as wood, wood chips, wood pellets, or the like, wherein the combustion device comprises a first chamber and a second chamber, wherein the second chamber is arranged underneath the first chamber and the first chamber receives the fuel, wherein the first chamber comprises, at the bottom, an intermediate layer of combustible material which holds the fuel in the first chamber as long as the intermediate layer is not damaged or destroyed by combustion and such that, following damage to or destruction of the intermediate layer, fuel located in the first chamber falls into the second chamber, wherein, during the combustion process in the first chamber, substantially gas combustion is caused and, after the fuel has been conveyed into the second chamber, coal burning preferably occurs, or the fuel may be removed from the second chamber through an opening.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.

A burner for solid particle fuels such as shavings or pellets. The invention includes a helical piston to deliver fuel particles up an inclined tube into a cup having an oxygen delivery tube for combustion. The helical piston is axially extendable and retractable to first advance material up the tube without rotation, and then retract with rotation so as to screw itself into the next charge of material to be advanced. Combustion heat may be used to drive a Stirling engine or other mechanism for converting heat into other useful energy or power, such as using the burner as a component of a combined heat and power (CHP) system.

A burner for solid particle fuels such as shavings or pellets. The invention includes a helical piston to deliver fuel particles up an inclined tube into a cup having an oxygen delivery tube for combustion. The helical piston is axially extendable and retractable to first advance material up the tube without rotation, and then retract with rotation so as to screw itself into the next charge of material to be advanced. Combustion heat may be used to drive a Stirling engine or other mechanism for converting heat into other useful energy or power, such as using the burner as a component of a combined heat and power (CHP) system.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.

A burner for solid particle fuels such as shavings or pellets. The invention includes an auger to deliver fuel particles up an inclined tube into a cup having an oxygen emitting orifice for combustion. The auger is axially extendable and retractable to first advance material up the tube without rotation, and then retract with rotation so as to screw itself into the next charge of material to be advanced. Combustion heat may be used to drive a Stirling engine to comprise a combined heat and power (CHP) system.

Flue gases may also be condensed onto chilled objects as beneficial ceramic-like coatings, or these objects may be made of frangible or soluble material so that the condensate may be collected separately as a valuable ceramic-like material.

An apparatus in which a solid fuel mass is burned controls the burn rate to slow the burning process and extend the lifespan of the solid fuel mass. The apparatus has a base cup configured to receive a lower portion of the solid fuel mass, and a descent cup configured to receive an upper portion of the solid fuel mass, wherein the descent cup includes a flame orifice. The descent cup is telescopically associated with the base cup and moves toward the base cup as the solid fuel mass is burned, and a flame produced as the solid fuel mass is burned extends outwardly from the flame orifice of the descent cup.

A floor and an upright sidewall formed from two vertically coaxial components, each component having a floor baffle with a plurality of floor openings defined therein, each floor retained within a respective upright sidewall with a plurality of sidewall openings defined therein. The floor openings and the sidewall openings cooperate between the two coaxial components such that flow of gases through the floor and upright sidewall of the baffle structure is controlled by rotation of the two vertically coaxial components relative to one another.