A fuel burner and optional modular heat utilizing appliances capable of exploiting heat from the fuel burner are shown and described. The burner includes a fire box including a fuel holder, a surrounding inner housing, and an outer shroud surrounding the inner housing. A plurality of air openings including flow adjusters admit air to the fire box. The inner housing and outer shroud are configured to supply air for secondary combustion of the exhaust. The burner may include a fan for forced air induction, and a fuel chute having a slidable closure for recharging the fuel holder from outside. At least one modular heat utilizing appliance may have thermal insulation for retaining heat.

The present invention relates to a flow measurement system arranged for controlling a gas fireplace (1). It comprises a flow passage (11) in fluid communication with the gas fireplace to be controlled by use of a differential pressure pressostat (13). A first gauge connector (14) is arranged in the flow passage and connected to a first pressure sensor in the differential pressure pressostat for measuring a total pressure in a fluid flowing in the flow passage. A second gauge connector (15) is arranged near the first gauge connector and connected to a second pressure sensor in the differential pressure pressostat for measuring a static pressure in the fluid flowing in the flow passage. Based on these measures a dynamic pressure, and there from the flow velocity, in the fluid flowing in the flow passage is determined. This parameter is used to switch off the gas fireplace, when the flow becomes below a set threshold value. The second gauge connector (15) is arranged within a space defined by a surrounding wall (16) having at least one opening (17) facing towards the first gauge connector. The surrounding wall and the at least one opening is dimensioned and shaped so that the static pressure in the space is the same or substantially the same as around the first gauge connector, and there is no or substantially no flow of fluid in the space. Hereby the formation of water droplets on the second gauge connector is prevented, whereby a more reliable and fault-safe system is obtained.

A fuel burner and optional modular heat utilizing appliances capable of exploiting heat from the fuel burner are shown and described. The burner includes a fire box including a fuel holder, a surrounding inner housing, and an outer shroud surrounding the inner housing . A plurality of air openings including flow adjusters admit air to the fire box. The inner housing and outer shroud are configured to supply air for secondary combustion of the exhaust. The burner may include a fan for forced air induction, and a fuel chute having a slidable closure for recharging the fuel holder from outside. At least one modular heat utilizing appliance may have thermal insulation for retaining heat.

A biomass pellet combustion system includes a primary burn chamber, a coal burn chamber, and a gas burn chamber. The primary burn chamber is configured to receive pellets from a drop tube of the biomass pellet combustion system. The coal burn chamber is configured to receive coals from the primary burn chamber. The gas burn chamber is configured to receive combustible gases from both the primary burn chamber and the coal burn chamber, wherein a secondary combustion process converts secondary combustion air and the combustible gases into exhaust gases in the gas burn chamber.

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 flue gas combustion apparatus for processing uncombusted flue gas components utilizing a reactor body. The reactor body houses first and second spiral passageways for motivating flue gas and ambient air, respectively, in a counter-current pattern. Heated ambient air feeds the flue gas in the reactor.

A solid fuel heating apparatus (1) comprising a combustion chamber provided with a glass door (4) opening to the outside, an intake device (11) for the intake of outside combustion air into said chamber, an outlet duct for the burnt gases (2) and a sealed preheating enclosure for preheating the combustion air, conveying said air to the combustion chamber, connected at a first end to the intake device (11) and ending at a second end with a plurality of openings (9) releasing the air preheated by the preheating enclosure into the combustion chamber, characterized in that the preheating enclosure consists of a set of sealed heat exchanging pipes containing the combustion gases and the burnt gases (3, 8, 12, 15, 17, 18, 19), ending with the abovementioned openings (9), which are variable in size and are arranged in such a way as to modulate the flow of preheated air released into the chamber, enclosing the flame and combustion area in the natural conical shape of said chamber.

A solid fuel burning cabinet circular heating appliance achieves improved emissions performance by providing a secondary air combustion path that preheats secondary combustion air. The firebox is selectively insulated such that areas of the firebox that do not preheat combustion air retain heat in the firebox while areas of the firebox that transfer heat into the combustion air transfer heat through the firebox into the incoming combustion air. The exhaust air path from the firebox to a chimney is also uninsulated to allow relatively quick heat transfer into a room in which the appliance is installed.

A cooking apparatus may have a vat configured to accommodate a heat source, the vat having a top open end. A grate covers the top open end and configured to receive foodstuff thereon to expose the foodstuff to heat from the heat source. A ventilation conduit extends from a bottom and/or a side of vat, the ventilation conduit having a first end in fluid communication with the vat, and having a second end away from the vat. The second end of the ventilation conduit is alternatively an air intake and a smoke exhaust.

An apparatus and method for the combustion of solid fuel are provided. The apparatus includes a combustion chamber with a floor, a side opening, an airflow disk located above the side opening, and secondary air inlets located above the airflow disk. The apparatus and method can efficiently combust solid fuels with low emission of particulate matter and harmful gases, continuous feeding of fuel during combustion, and the production of a spiral flame.