Abstract: A powdery coal burner is disclosed, which comprises a burner nozzle having an opening at the end of the burner body, through which a combustion-assisting gaseous medium is injected into a combustion area, means of providing a swirling motion to said combustion-assisting gaseous medium which is injected through said burner nozzle to said combustion area in a swirled state, an injection nozzle having an opening surrounding said burner nozzle opening, through which coal is injected toward said combustion area, and a primary air outlet nozzle having an opening surrounding said opening of said injection nozzle for the powdery coal, through which a primary combustion air is forwardly injected.

Abstract: A distributor for distributing a fluid from a main pipe to a plurality of branch pipes is disclosed which comprises a cylindrical inlet pipe portion for the introduction of fluid supplied through a main pipe, a branching portion one end of which concentrically communicates with said inlet pipe portion, a cover portion located at the other end of said branching portion, and a plurality of branch pipes which extend through said cover portion for carrying a distributed fluid, the diameter of said branching portion being larger than that of said inlet pipe portion, said plurality of branch pipes being arranged at equally spaced positions on a circle which is concentric with said branching portion, and each of said branch pipes extending into said branching portion.

Abstract: A heat exchanger for flue gas in which water tubes are inserted through the flue wall into the flue from the exterior thereof so as to be adjustable in the depth of insertion. Each of the water tubes has a structure comprising an inner water feed tube and an outer recovering tube for recovery of the waste heat by returning the water from the water feed tube to generate steam by heat transferring from the waste gas passing through the flue. Headers are provided at each exterior top of the feed water tubes and recovering tubes and are connected respectively to a water-steam drum through movable connecting tubes. The headers are movable in co-operation with driving means provided at the exterior of the flue so as to adjust the heating surface of the water tubes inserted into the flue by the action of the driving means.

Abstract: A burner for a furnace comprises a first pipe for delivering fuel to the furnace and a second pipe of larger diameter than the first pipe, positioned parallel with and encompassing the first pipe, which supplies air to the furnace in the annular space between the two pipes. The second pipe includes a large diameter section and a throttle section of gradually decreasing diameter which acts to speed up the air passing therethrough. In the annular space between the large diameter section of the second pipe and the first pipe is positioned a device having guide vanes which gives the air passing therethrough a swirling motion prior to acceleration in the throttle section. The burner further includes an air swirl passage between the throttle section of the second pipe and the furnace which conveys the air into the furnace. The air swirl passage also acts to convey the fuel into the furnace since the first pipe terminates prior to entry into the furnace.