US 5,687,780 A · Method of feeding catalyst and apparatus for the same

Abstract

A rotation driving system drives unitedly and rotatably sprinkle rotors, which the disk sprinkle rotors having plural partitive members extending in predetermined distances in a radial direction to the rotating axis are arranged in multistage state with a predetermined distance in a longitudinal direction. In the aforementioned state, by supplying the catalyst to the center of the sprinkle rotor, the catalyst is fed into a reaction tank while releasing in a radial direction of the sprinkle rotor. When the catalyst is fed, a rotation frequency of the sprinkle rotor is defined to be a speed constituent in a radial direction of over zero when the catalyst settles down and to be periodically changed between a maximum rotation frequency and a minimum rotation frequency. And further, a diameter of each sprinkle rotor being defined as measure to cause a position where the catalyst, released from the lower sprinkle rotor rotating in the maximum rotation frequency Nmax, settles down and a position where the catalyst, released from the upper sprinkle rotor rotating in the minimum rotation frequency Nmin, settles down to be nearly equal to one another. Therefore, the catalyst is fed in a uniformly scattering state by rolling in the radial direction after settling down and the position where the catalyst settles down in the radial direction is periodically changed, whereby the catalyst can be uniformly fed in the radial direction.

Claims19

Dependent claims

A method of feeding a catalyst inside a reaction tank by sprinkling with the catalyst from a catalyst releasing device while rotating a sprinkle rotor of the catalyst releasing device hung inside the reaction tank, comprising the steps of:

defining and maintaining a height from the fed catalyst surface to the catalyst releasing device in the reaction tank
selecting a rotation frequency of the catalyst releasing device so that the catalyst which lands onto the fed catalyst surface has a speed constituent Ux>0 in a radial direction of the reaction tank when the catalyst is released from the catalyst releasing device at an initial speed;
and
periodically changing the rotation frequency of the catalyst releasing device to maintain a uniform fed catalyst surface while feeding the catalyst into the reaction tank.

1 more element

An apparatus for feeding a catalyst, comprising:

plural disk sprinkle rotors each having plural partitive members extending in a radial direction to an axis of rotation spaced at a predetermined distance from one another, the plural disk sprinkle rotors being oriented as multistage disks in a predetermined distance from one another in a vertical direction;
a catalyst releasing device including a rotation driving system for driving rotatably the sprinkle rotors;
a pendant system hanging the catalyst releasing device inside a reaction tank and capable of adjusting the height of the catalyst releasing device within the reaction tank;
and
a control means for controlling rotation frequency of the catalyst releasing device, the control means controlling the rotation driving system of the catalyst releasing device to periodically and cyclically change the rotational frequency of the sprinkle rotors in the catalyst releasing device between a predetermined maximum rotation frequency and minimum rotation frequency during feeding of the catalyst onto a fed catalyst surface in the reaction tank, the maximum rotation frequency being defined as a rotation frequency causing the catalyst, released from the uppermost sprinkle rotor of the plural sprinkle rotors in the catalyst releasing device, to fall down around bottom inner wall of the reaction tank, and the minimum rotation frequency being defined as a rotation frequency causing the catalyst, released from the uppermost sprinkle rotor, to fall down to substantially the same position as where the catalyst released from a second sprinkle rotor positioned just under the uppermost sprinkle rotor falls down to when the sprinkle rotor is rotated at the maximum rotation frequency, and a diameter of each sprinkle rotor being defined so as to cause a first position where the catalyst, released from the lower sprinkle rotor of the lengthwise adjacent sprinkle rotors, settles down when the lower sprinkle rotor rotates at the maximum rotation frequency and a second position where the catalyst, released from the upper sprinkle rotor of the lengthwise adjacent sprinkle rotors, settles down when the upper sprinkle rotor rotates at the minimum rotation frequency, said first and second positions being generally equal to one another.

2 more elements

Dependencies are inferred from the claim text.

Method of feeding catalyst and apparatus for the same

Life of this patent

Method of feeding catalyst and apparatus for the same

Life of this patent

Abstract

Claims19