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.

This solid fuel burner is provided with: a venturi tube in which a channel for mixed fluid in a fuel nozzle narrows toward the center in the channel cross section; a fuel concentrator that imparts, to the mixed fluid, a velocity component away from the center of the fuel nozzle; and a channel separation member that separates the channel of the fuel nozzle into an internal side and an external side; wherein the channel separation member is shaped in such a way that the cross sectional area of an external channel is larger at the downstream end than at the upstream end, and the upstream end of the fuel concentrator is located between the upstream end and the downstream end of an expanded portion of the venturi tube. This solid fuel burner prevents solid fuel particles, which is ground biomass fuel, from adhering and depositing inside the nozzle.

A vented fire tarp is provided that includes a base portion and a plurality of vents formed in the base portion, wherein each vent allows for air, smoke, and carbon dioxide to pass through the vent from one side of the base portion to the other. The vented fire tarp also includes securing devices to couple the base portion to a ground surface over a fire. In use, the vented fire tarp covers a fire and controls a burn rate of wood of the fire in response to controlling airflow through the plurality of vents of the vented fire tarp.

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 combustor including a first perforated layer including a first opening having a first diameter, wherein the first opening is configured to receive a flow of fluid including a fuel and air mixture; and impart a first rotational instability to the flow of fluid that is dependent on the first diameter; and a second perforated layer surrounding a combustion area, wherein the second perforated later includes a second opening having a second diameter, and wherein the second layer is located between the first layer and the combustion area.

A solid fuel combustion device includes: a fuel supply device including a firewood feed pipe or another fuel supplier; a primary combustion chamber coupled to the fuel supply device; a secondary combustion chamber including a wall formed of a fireproof material and having a structure in which a space is formed at a side of the combustion gas outlet of the primary combustion chamber to induce primary combustion gas to be secondarily expanded and combusted; and an air supply system including at least one air supply device in an entire combustion path formed in the primary combustion chamber and the secondary combustion chamber.

A combustor including a first perforated layer including a first opening having a first diameter, wherein the first opening is configured to receive a flow of fluid including a fuel and air mixture; and impart a first rotational instability to the flow of fluid that is dependent on the first diameter; and a second perforated layer surrounding a combustion area, wherein the second perforated later includes a second opening having a second diameter, and wherein the second layer is located between the first layer and the combustion area.

A combustor includes a combustion chamber including a grate and a combustion space formed above the grate; a fuel supply portion downwardly connected to a central portion of the grate to supply fuel to an upper portion of the grate; an air supply part connected to a side portion of the combustion chamber to be inclined on a horizontal plane, such that the combustion air rotates in the combustion space; a clinker collection portion downwardly communicating with a gap formed between an inner wall of the combustion chamber and the grate, to collect clinker generated by combustion of fuel in the clinker collection portion; and a reintroduction channel passing through the grate, such that the combustion air is reintroduced into the combustion space.

A smoker configured to infuse smoke into flavor and/or taste of a beverage or food includes a body member having a through bore extending from a first end of the body member to an opposite second end of the body member in a first direction and an insert configured to be received in the through bore at the first end and retained by the through bore at a position between the first end and the second end. The through bore and the insert are configured to define a chamber for receiving a combustible material between the insert and the first end, the through bore is configured to permit a flow of smoke from the combustible material out the through bore at the second end of the body member, and the second end of the body member is configured to rest on a rim of a container to block the flow of air from the container where a surface of the second end of the body member contacts the rim.

A boiler 7 includes: a combustion furnace 100 having a combustion chamber 100F therein; a heat exchanger 140 configured to transfer, to water, thermal energy obtained by burning a solid fuel in the combustion chamber 100F; a belt conveyor 120 including a movable loader 120a, disposed on a bottom of the combustion chamber 100F, and configured to move the solid fuel on the movable loader 120a in the combustion chamber 100F; and a fuel supplier 130 connected to a fuel supply port 111a that communicates an inside and an outside of the combustion furnace 100. The belt conveyor 120 has a starting point below the fuel supply port 111alb . The fuel supplier 130 includes a thickness adjuster 131 that adjusts a thickness of the solid fuel on the movable loader 120a of the belt conveyor 120.