JPH0133152Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a granular catalyst filling machine.

[Prior art]

A shell-and-tube heat exchange reactor is well known as one of the most typical reactors for gas-phase catalytic reactions that generate a large amount of heat. However, some large-sized reactors consist of several thousand catalyst-filled reaction tubes, and the flow resistance of the reaction gas in each tube must be uniform within a certain range. is required. If this is non-uniform, the flow rate of the reaction gas will be different for each tube, the reaction rate will also be non-uniform, and in some cases, the reactor as a whole may not be able to be controlled at all. Therefore, in order to uniformly charge the catalyst into each tube of this reactor, a great deal of effort has been expended, and skill and time have been required.

Further, Japanese Patent Application Laid-Open No. 55-24516 discloses a system in which a trough with a vibrating feeder installed horizontally allows dust to be separated and the catalyst to be extracted. However, in a horizontally installed trough with a vibrating feeder, even if the feeding speed is adjusted by the amplitude of the vibration, the feeding speed in this case is the horizontal speed and does not contribute to the vertical falling speed. Therefore, even if a conventional trough is used to charge the catalyst into the reactor, it is difficult to ensure an adjustable and uniform packing density. Ta.

[Purpose of invention]

Therefore, an object of the present invention is to eliminate the drawbacks or inconveniences of the above-mentioned prior art.

As a result of extensive research based on this experience, the inventors of the present invention discovered that when filling a reaction tube with catalyst, by feeding a certain amount of catalyst particles at a constant speed, each reaction tube is uniformly filled. It has been found that a filled state can be obtained, and the above-mentioned constant speed is the falling speed by a chute extending in the vertical direction and the vinyl tube, and the adjustable vertical feeding speed to the chute by a trough with an electromagnetic feeder whose inclination angle is adjustable. This invention was completed by focusing on what can be obtained from the sum of

[Summary of the idea]

The catalyst filling machine according to the present invention has a trough with an electromagnetic feeder whose inclination angle can be adjusted between a hopper and a reaction tube placed below the hopper, and a trough with an electromagnetic feeder that hangs down from the outlet of this trough to form particles. It is characterized by the provision of a chute and a vinyl tube through which the catalyst is dropped into the reaction tube at a constant head.

[Structure of the idea]

The present invention will be explained below using figures.

A funnel-shaped chute 13 is inserted into the reaction tube 14 to be filled with a catalyst, and the chute 8 and vinyl tube 9 of the catalyst filling machine are aligned with the center of the chute 13.
3. Place the catalyst filling machine so that it is inserted to some extent. In addition, the damper 12 of the hopper 1 of the catalyst filling machine
opening degree and inclination angle of trough 3, controller 4
The amplitude of the feeder 2 is determined in a preliminary test and set in advance.

Next, after putting the weighed amount of catalyst for one reaction tube into the hopper, the controller 4 is turned on to start filling. The catalyst is delivered at a set speed by the back-and-forth vibration of the trough, and is filled into the reaction tube through the chute at a constant speed. A small amount of catalyst powder generated during handling is received in a powder receiver 6 by a sieve part 7 formed by a mesh surface provided in a part of the trough. Once the hopper is completely filled with catalyst, the same procedure is repeated for the next reaction tube to fill it with catalyst.

[Effect of idea]

According to the present invention, by performing the filling process as described above, it is possible to achieve a uniform packing density for each tube in the shortest possible time without requiring special skill, even when filling thousands of reaction tubes. I can do it.
In addition, there is a trough with an electromagnetic feeder whose inclination angle can be adjusted between the hopper and the reaction tube placed below the hopper, and a trough with an electromagnetic feeder that hangs down from the outlet of the trough to feed the granular catalyst at a constant height. Since the structure includes a chute and a vinyl tube for dropping into the reaction tube, an adjustable falling speed can be obtained, and an adjustable and uniform packing density can be obtained by this falling speed.

〔Example〕

When the filling machine of the present invention was used for catalyst refilling of reactors at an ethylene oxide plant, 4,000 reaction tubes with a diameter of 38 mm and a length of 12 m were filled with ring-shaped catalysts with an outer diameter of 7 mm and a length of 10 mm. When the flow resistance due to air in each tube was measured and the packing density was checked, it was found that 96% of all reaction tubes had variations within ±3%. This is well within the standard value for the ethylene oxide process, and compared to other conventional filling machines where 80 to 90% of all reaction tubes fall within ±3%, this was an extremely favorable filling rate. . Note that this work did not require any specific skilled personnel.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one example of implementation of the present invention. 1...Hopper, 2...Electromagnetic feeder, 3
... Trough, 4 ... Controller, 5 ... Trough inclination angle adjustment handle, 6 ... Powder receiver, 7 ... Wire mesh part, 8 ... Upper chute, 9 ... Vinyl tube, 10 ... Spring, 11 ... trestle, 12
... Catalyst amount adjustment damper, 13 ... Reaction tube side chute, 14 ... Reaction tube.

Claims (1)

[Scope of utility model registration request] A trough with an electromagnetic feeder whose inclination angle can be adjusted is installed between the hopper and the reaction tube placed below the hopper, and a trough with an electromagnetic feeder is provided hanging from the outlet of the trough to feed the granular catalyst into the reaction tube at a constant height. A catalyst filling machine characterized by being equipped with a chute and a vinyl tube.