US 2018/0036697 A1Published application

Apparatus and method for calcination of gypsum

AssigneeYoshino Gypsum Co., Ltd.

InventorsKatsumi NIIMI, Kazumi ENDO, Takeshi TAKENAKA, Kouji NITOH

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Abstract

An apparatus for calcination of gypsum includes a gypsum calciner having an interior wall surface with a circular or annular configuration as seen in its plan view, and a tubular combustor positioned at a center part of a body of the calciner. Raw gypsum is calcined or dehydrated by a high temperature gas spouting flow (Hg) ejected from a lower portion of the combustor. The calciner has a stationary-vane-type or movable-vane-type auxiliary device, which circumferentially energizes the raw gypsum in the vicinity of the interior wall surface toward a circumferential direction of the calciner. The auxiliary device has a plurality of stationary vanes circumferentially arranged in an outer peripheral zone of a lower portion of the combustor and spaced apart from each other at an angular interval, or an agitator extending through a conical or inner circumferential surface defined by the interior wall surface.

Claims25

Dependent claims

An apparatus for calcination of gypsum, which includes a gypsum calciner having an interior wall surface with a circular or annular horizontal cross-section or profile, and a tubular combustor located at a center part of the calciner and generating a high temperature gas, wherein a spouting flow of the high temperature gas is ejected to an interior area of the calciner through a high temperature gas outlet provided at a lower part of the combustor, so that raw gypsum fed to the interior area continuously or intermittently is calcined or dehydrated by the high temperature gas, and the calcined or dehydrated gypsum is discharged out of the calciner, comprising:

an auxiliary device energizing the raw gypsum in vicinity of the interior wall surface toward a circumferential direction of said calciner, or augmenting a movement of the raw gypsum in the vicinity of the interior wall surface toward the circumferential direction,
wherein the auxiliary device has a plurality of stationary vanes circumferentially arranged in an outer peripheral zone of said combustor and spaced at an angular interval from each other,
and the vanes adjacent to each other define a fluid path for the raw gypsum and the high temperature gas, so that an upward flow of said high temperature gas, which is spouted to a bottom part of the calciner, is deflected toward a radially outward and circumferential direction of said combustor by the fluid path.

an auxiliary device energizing the raw gypsum in vicinity of the interior wall surface toward a circumferential direction of said calciner, or augmenting a movement of the raw gypsum in the vicinity of the interior wall surface toward the circumferential direction,
wherein the auxiliary device has an agitator which extends through a conical surface or an inner circumferential surface defined by said interior wall surface;
wherein the agitator is provided with a rotary shaft protruding into the calciner from said conical or inner circumferential surface in a position below an upper surface of the raw gypsum accumulated in the calciner, and an agitating vane rotating in the interior area with rotation of the rotary shaft;
and
wherein a center axis (X) of the rotation of said shaft is oriented in a direction at an angle (θ12) in a range from 30 degrees to 80 degrees as seen in its plan view, relative to a normal line (RL) passing through a point of intersection (CP) between said axis (X) and said conical or inner circumferential surface, and said vane rotates about said axis (X) to energize the raw gypsum in the vicinity of the interior wall surface toward a circumferential direction of the interior wall surface.

2 more elements

A method for calcination of gypsum, in which a calciner having an interior wall surface with a circular or annular configuration as seen in its plan view, and a tubular combustor located at a center part of the calciner are provided, and raw gypsum in the calciner is calcined or dehydrated by a spouting flow of a high temperature gas ejected from a lower part of the combustor,

wherein a plurality of stationary vanes are arranged in an outer peripheral zone of said combustor and spaced at an angular interval from each other, and
wherein an upward flow of said high temperature gas spouting to a bottom part of the calciner is guided toward a radially outward and circumferential direction of said combustor by said vanes, and fluidization of said raw gypsum toward the radially outward and circumferential direction of the combustor is caused by said upward flow, whereby the raw gypsum in vicinity of the interior wall surface is energized toward the circumferential direction of the calciner, or a movement of the raw gypsum toward the circumferential direction in the vicinity of the interior wall surface is augmented.

Dependencies are inferred from the claim text.