| 摘要 |
In a burner gun of the type including a conduit having a gas inlet supplied with a gas and an outlet, a burner nozzle assembly includes an outlet plate secured to the outlet of the gas conduit and having a plurality of circumferentially arranged cylindrical orifices extending therethrough, the outer surface of outlet plate including a circular central portion surrounded by the orifices and operative as a bluff body, whereby positive flame retention in the range of 5 PSI to 50 PSI is obained; a hollow cylinder having a plurality of plugs secured to an end face thereof and axially movable with respect to the orifices to vary the openings thereof so as to provide a constant velocity gas exiting through the orifices; and a piston rod connected to the cylidner and externally controlled to slideably move cylinder and thereby control movement of the orifice plugs with respect to the orifices so as to vary the openings of the latter. In this first embodiment, the hollow cylinder does not impede the flow of natural gas. In a second embodiment, the orifices are arranged in at least one linear row parallel to the material to be burned to reduce the residual sulfide level in a lime sludge kiln to less than 20 ppm. In a third embodiment for use with a radial duct burner, the orifices are arranged in the conduit for radial emission of the natural gas and a mechanism for translating reciprocable motion to rotational motion to reciprocable motion is provided such that a plurality of orifice plugs in the form of balls are reciprocably movable with respect to the orifices in the radial direction. |
