Calcined gypsum treatment device and calcined gypsum treatment method

Patent metadata

Field	Value
Publication number	US-10974993-B2
Application number	US-201716070076-A
Country	US
Kind code	B2
Filing date	Jan 31, 2017
Priority date	Feb 2, 2016
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A calcined gypsum treatment apparatus has an agitating type of cooler provided with a cooling region for cooling the calcined gypsum, and a moisture supplying device for incorporating moisture into the calcined gypsum. The moisture supplying device includes a humid gas-feeding port which introduces humid gas including moisture or steam, directly into the cooling region. The calcined gypsum is introduced through a calcined gypsum introduction port into the cooling region, and the moisture is incorporated into the calcined gypsum to modify the calcined gypsum. The humid gas-feeding port is positioned in vicinity to the calcined gypsum introduction port so as to allow the spouted or delivered flow of the humid gas to be brought into contact with the calcined gypsum immediately after introduced into the cooling region.

First claim

The invention claimed is:

1. A calcined gypsum treatment apparatus, which has a moisture supplying device for incorporating moisture into calcined gypsum and an agitating type of cooler provided with a cooling region for cooling the calcined gypsum;
wherein said moisture supplying device includes a humid gas-feeding port which introduces a spouted flow or delivered flow of humid gas, including moisture or steam, directly into the cooling region;
wherein said cooler is provided with a calcined gypsum introduction port for introducing the calcined gypsum into said cooling region; and
wherein said humid gas-feeding port is positioned in vicinity to said calcined gypsum introduction port so as to cause said spouted or delivered flow of the humid gas to be brought into contact with said calcined gypsum immediately after being introduced into said cooling region.

2. The apparatus as defined in claim 1 , wherein said humid gas is a high temperature and high humidity gas produced in a calciner for calcination of said calcined gypsum and separated from the calcined gypsum; said cooler has a calcined gypsum supply device including the calcined gypsum introduction port; a calcined gypsum conveyance conduit, which conveys the calcined gypsum, is connected to the calcined gypsum supply device; and a humid gas delivery conduit for delivering said high temperature and high humidity gas is in communication with said humid gas-feeding port.

3. The apparatus as defined in claim 1 , wherein said cooler is a multi-tubular cooler which has a rotary-agitator type of cylindrical shell defining said cooling region and an air-cooling type of heat exchanger using air as a cooling medium; a center axis of rotation of said shell extends longitudinally and is inclined at a predetermined angle with respect to a horizontal plane; said calcined gypsum introduction port is located at one end portion or a proximal end portion of said shell; and the calcined gypsum introduced into said cooling region moves toward another end portion or a distal end portion of said shell in accordance with an inclination of the shell.

4. The apparatus as defined in claim 1 , wherein said humid gas-feeding port is positioned in a range of a circular or hemispherical area having a radius 1.5α about a center (β) of said calcined gypsum introduction port, with respect to a diameter or maximum size of the calcined gypsum introduction port, where the diameter or maximum size is represented by α.

5. The apparatus as defined in claim 1 , wherein said calcined gypsum introduction port has a circular profile; and said humid gas-feeding port is an annular opening concentrically surrounding the calcined gypsum introduction port, or a plurality of openings arranged in an annular formation around the calcined gypsum introduction port.

6. The apparatus as defined in claim 2 , wherein said calcined gypsum supply device is a screw-feeder type of calcined gypsum supply device which has a screw part driven in rotation to extrude the calcined gypsum toward said calcined gypsum introduction port; said moisture supplying device has a humid gas-feeding device located so as to surround a cylindrical housing of said screw part; the humid gas-feeding device has a humid gas passage through which said humid gas delivery conduit is in communication with said humid gas-feeding port; and the humid gas passage is a fluid passage having an annular cross-section, which is formed in an outer peripheral zone of said screw part.

7. The apparatus as defined in claim 1 , wherein said humid gas-feeding port is oriented to direct said spouted or delivered flow substantially in a direction in parallel with a center axis of the calcined gypsum introduction port, or in a direction converging with the center axis thereof.

Assignees

• Yoshino Gypsum Co

Inventors

• Hayase Ken

Classifications

• F26B21/25

  partly outside the drying enclosure · CPC title

• C01F11/466

  Conversion of one form of calcium sulfate to another · CPC title

• C01P2006/82

  water content · CPC title

• C04B11/0285

  Rotary kilns · CPC title

• B01J19/0013

  Controlling the temperature of the process · CPC title