Abstract: A variety of essentially circulr-planform fire grates having ash discharge openings therein and intimate-contact preventing means thereon is presented. The intimate contact preventing means for the fire grate having upper surface contour of fluctuation-free profile in the circumferential direction of the fire grate comprises first fluctuation-free-bottom spider-web-planform fins having fin upper surface of fluctuation-free profile and second fluctuation-free-bottom spider-web-planform fins having fin upper surface of fluctuational profile. The intimate contact preventing means for the fire grate having upper surface contour of fluctuational profile in the circumferential direction of the fire grate comprises first fluctuational-bottom spider-web-planform fins having fin upper surface of fluctuation-free profile and second fluctuational-bottom spider-web-planform fins having fin upper surface of fluctuational profile.

Abstract: An integral, semi-integral, or modular apparatus for inducing pressure drop between upstream and downstream of the apparatus for exhaustion of flue gas as through the exhaust piping of a cyclone separator, smoke stack of boilers, or other exhaust piping is presented. The invented 1st apparatus comprises 1st plenum confinement means having a 1st and 2nd CO(circular opening) on upper and lower side thereof respectively, a 1st circular OC(outer cylinder) inserted downward through the 1st CO and secured, and a 1st circular IC (inner cylinder) inserted upward through the 2nd CO and secured, whereby pressurized gas retained in the 1st plenum confinement means is injected to make a 1st annular jet through a 1st annular passage defined by outer surface of the 1st IC and inner surface of the 1st OC so that the flue gas flow inside of the 1st IC is easily sucked up toward downstream of the 1st apparatus due to the pressure drop caused by high kinetic energy of the vertical velocity component of the 1st annular jet.

Abstract: This invention provides a variety of incineration furnace with modular fire grate apparatus for cylindrical incinerator furnaces of water jacket configuration. The invented fire grate module is provided with refuse dump agitation capability from underside of waste fuel dump on the fire grate and also with air supply function in the fire grate apparatus itself.

Abstract: At least one ring-shaped fin is disposed on the upper surface of a variety of circular planform stationary fire grate having a multiplicity of ash discharge openings thereon and for use in combustion chamber of either water jacket or fire brick type cylindrical incinerators. The first version is a circular planform stationary grate having circumferentially fluctuational upper surface contour selectively with at least one fluctuational or fluctuation-free ring-shaped fin arrangements thereon. The second version of the fire grate is a circular planform stationary grate having horizontal and fluctuational concentric rings in combinational fashion in radial direction, the concentric rings being defined by a multiplicity of arc-shaped ash discharge openings.