In an indoor installation type combustion apparatus in which an upper surface of the exterior case has formed therein: a cylindrical exhaust connection port which is in communication with an exhaust duct and which is connectable to an exhaust pipe; a first cylindrical air supply connection port which is connectable to an air supply pipe of double-pipe system containing therein the exhaust pipe and which encloses the exhaust connection port; and a second cylindrical air supply connection port which is connectable to an air supply pipe of twin-pipe system which is separate from, and independent of, the exhaust pipe, a low-cost apparatus is provided in which the air flowing in from whichever the first and the second air supply connection ports will be treated by one and the same supply-air filter. An air supply box which is in communication with both the first and the second air supply connection ports is disposed. An outlet opening is formed at one place of the air supply box so that the air flowing in from an arbitrary air supply connection port between the first and the second air supply connection ports is discharged into an inner space of the exterior case. A supply-air filter to collect foreign matters in the air is mounted in the outlet opening.

In an indoor installation type combustion apparatus in which an upper surface of the exterior case has formed therein: a cylindrical exhaust connection port which is in communication with an exhaust duct and which is connectable to an exhaust pipe; a first cylindrical air supply connection port which is connectable to an air supply pipe of double-pipe system containing therein the exhaust pipe and which encloses the exhaust connection port; and a second cylindrical air supply connection port which is connectable to an air supply pipe of twin-pipe system which is separate from, and independent of, the exhaust pipe, a low-cost apparatus is provided in which the air flowing in from whichever the first and the second air supply connection ports will be treated by one and the same supply-air filter. An air supply box which is in communication with both the first and the second air supply connection ports is disposed. An outlet opening is formed at one place of the air supply box so that the air flowing in from an arbitrary air supply connection port between the first and the second air supply connection ports is discharged into an inner space of the exterior case. A supply-air filter to collect foreign matters in the air is mounted in the outlet opening.

A biomass heating system for firing fuel in the form of pellets and/or wood chips is disclosed, comprising: a boiler with a combustion device; a heat exchanger with an inlet and an outlet; wherein the combustion device comprises a combustion chamber with a primary combustion zone and with a secondary combustion zone provided downstream thereof; the combustion device having a rotating grate on which the fuel can be burned; the secondary combustion zone of the combustion chamber being fluidically connected to the inlet of the heat exchanger and the primary combustion zone being laterally enclosed by a plurality of combustion chamber bricks.

A biomass heating system for firing fuel in the form of pellets and/or wood chips is disclosed, comprising: a boiler with a combustion device; a heat exchanger with an inlet and an outlet; wherein the combustion device comprises a combustion chamber with a primary combustion zone and with a secondary combustion zone provided downstream thereof; the combustion device having a rotating grate on which the fuel can be burned; the secondary combustion zone of the combustion chamber being fluidically connected to the inlet of the heat exchanger and the primary combustion zone being laterally enclosed by a plurality of combustion chamber bricks.

A burner (1) for producing a flame for a heat generation system, comprising a fuel supply line (3) and at least one a comburent intake system operatively connected to the combustion head (2) for supplying a flow rate of fuel and a flow rate of comburent, respectively, to the burner (1). The burner (1) comprises a turbogas unit having an auxiliary combustion chamber (6) in which combustion takes place and for the generation and conveying, downstream, of a flow of flue gases; and a turbine (7) activated by the flue gases produced by the auxiliary combustion chamber (6). In particular, the turbine (7) is operatively active to contribute at least partially to the movement of the fuel in said comburent supply system (4).

A burner (1) for producing a flame for a heat generation system, comprising a fuel supply line (3) and at least one a comburent intake system operatively connected to the combustion head (2) for supplying a flow rate of fuel and a flow rate of comburent, respectively, to the burner (1). The burner (1) comprises a turbogas unit having an auxiliary combustion chamber (6) in which combustion takes place and for the generation and conveying, downstream, of a flow of flue gases; and a turbine (7) activated by the flue gases produced by the auxiliary combustion chamber (6). In particular, the turbine (7) is operatively active to contribute at least partially to the movement of the fuel in said comburent supply system (4).

The disclosed technology includes a device for extending the turndown ratio of a gas-fired burner system. The device can comprise a variable area device configured reduce the amount of fuel and air passed to the burner during low output conditions by adjusting the cross-sectional area of the passage between the blower and the burner. The variable area device can be controlled by an actuator that adjusts the position of the variable area device. The actuator can be manually controlled, mechanically controlled, or electronically controlled.

The disclosed technology includes a device for extending the turndown ratio of a gas-fired burner system. The device can comprise a variable area device configured reduce the amount of fuel and air passed to the burner during low output conditions by adjusting the cross-sectional area of the passage between the blower and the burner. The variable area device can be controlled by an actuator that adjusts the position of the variable area device. The actuator can be manually controlled, mechanically controlled, or electronically controlled.

Some embodiments of the disclosure provide a steam generator and a car washer with the steam generator. The steam generator includes: a boiler having a combustion chamber. The steam generator further includes: a windproof cover, at least a part of an ignition device of the steam generator being located in the windproof cover; an igniting cover, at least a part of the igniting cover being located in the combustion chamber, and an outlet of the windproof cover being located in the igniting cover; an air inlet grating, the air inlet grating being provided around the windproof cover and connected with the windproof cover, and the air inlet grating being located on an inner side of an air inlet of the igniting cover, to prevent airflow in the igniting cover from flowing out from the inlet of the igniting cover.

Provided is a water heater including a burner that receives a supply of combustion air from a fan, a heat exchanger having a heat transfer tube, and a combustion chamber case in which a combustion chamber of the burner is formed in the interior thereof and which is to be capable of guiding combustion gas generated by the burner to the heat exchanger. The water heater further includes a unit case that surrounds the combustion chamber case, and a region on the outside of the combustion chamber case within the unit case serves as an air pressure chamber having a higher pressure than the combustion chamber. Thus, combustion gas leakage to the outside can be prevented or suppressed appropriately by means of a simple configuration.