A device for cleaning a tip of a furnace burner including a support tube of axis X intended to pass through the burner and where the support tube includes a metal cable connected at one of its ends to a scraper and at the other end to a system for setting and maintaining the position of the scraper, where the scraper is articulated on the support tube between a first position aligned with the axis X in the continuation of the support tube and a second position perpendicular to the axis X, where the scraper has a chamfered part on its profile and where the support tube is connected to a rotation means for rotating the entire whole device in rotation. It can be set in place and manipulated from the rear of the burner, thereby ensuring a good level of safety for interventions, such that a rotational and/or translational movement about the tip of the burner allows the concretions to be cleaned off effectively whatever their nature (shape, hardness, etc.) and their position.

A powder discharge system is installed in a circulating water tank for collecting powder generated when an exhaust gas is treated in an exhaust gas treatment apparatus. The powder discharge system includes at least one eductor provided in the circulating water tank. The eductor has a nozzle configured to throttle a flow of water supplied from a pump for pumping water in the circulating water tank, a suction port configured to suck water in the circulating water tank into the eductor by utilizing a reduction of pressure generated when the flow of water is throttled by the nozzle, and a discharge port configured to eject the water sucked from the suction port together with the water discharged from the nozzle toward a bottom of the circulating water tank.

A nozzle structure of a burner includes: a housing having an exhaust opening penetratingly-formed at an upper surface thereof, and having therein an accommodation space communicated with the exhaust opening; a fuel supply member connected to the housing such that one end thereof communicates with one side of the accommodation space, for supply of liquid fuel to inside of the accommodation space; a fuel supply controller accommodated in the accommodation space so as to be movable up and down, and having a fuel supply micro-control member at an end thereof, the fuel supply micro-control member configured to micro-control the amount of fuel to be supplied, by being selectively inserted into or separated from the exhaust opening as it moves up and down; and a heating pipe connected to two sides of an outer surface of the housing with different heights, so as to communicate with the accommodation space.