Bisphenol A centrifugal granulation nozzle airlock cabin

Abstract

The invention provides a bisphenol A centrifugal granulation nozzle airlock cabin, a bisphenol A centrifugal granulation tower comprises an operation room and a granulation cabin which are isolated by a tower plate, and the airlock cabin is arranged below the operation room and comprises a cabin body, an upper cabin door, a lower cabin door and a filler sealing assembly; the granulation nozzle main shaft sleeve and the input pipe penetrate through the upper cabin door and are sealed by adopting a filler sealing assembly, the upper cabin door can move up and down on the granulation nozzle main shaft and the feeding pipe, and the filler sealing assembly ensures that the main shaft is sealed with the feeding pipe and the upper cabin door when the upper cabin door moves; and the upper cabin door and the lower cabin door are not opened at the same time, so that at least one of the operation room and the granulation tower is sealed when the bisphenol A centrifugal granulation nozzle is at any station, and no nitrogen overflows to the operation room.

Description

Technical Field

[0001] The invention relates to the field of bisphenol A rotary nozzle granulation. Aiming at a centrifugal nozzle granulation system adopting nitrogen circulation cooling, an air lock cabin is adopted to solve the nitrogen leakage problem of a granulation tower during nozzle replacement. Background Art

[0002] For the rotary nozzle granulation system with nitrogen circulation cooling, the granulation tower operates at a slight positive pressure, and the rotary nozzle extends into the granulation tower. The bisphenol A molten liquid in the nozzle is thrown out from the side wall of the nozzle under the action of centrifugal force and breaks into droplets. It exchanges heat with the rising nitrogen in the tower in countercurrent, cools and solidifies into solid particles and falls to the bottom of the tower. The rotary nozzle feed pipe is equipped with a sealing gland, and a sealing gasket is provided between the gland and the tower plate to ensure that the granulation tower is sealed after the rotary nozzle is in place. When replacing the nozzle, the lifting motor starts, the rotary nozzle is lifted, and the nitrogen in the tower overflows into the operating room, causing safety hazards. The previous solution was to set an axial flow fan at the top of the tower, and turn on the axial flow fan for ventilation when replacing the rotary nozzle to ensure the oxygen content in the operating room. Summary of the invention

[0003] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide an air lock cabin with a simple structure, convenient operation and leakage-free replacement of centrifugal granulation nozzles.

[0004] The technical solution of the present invention is: an airlock cabin for a bisphenol A centrifugal granulation nozzle, a bisphenol A centrifugal granulation tower comprises an operation room and a granulation cabin separated by tower plates, the airlock cabin is arranged below the operation room, comprises a cabin body, an upper cabin door, a lower cabin door and a packing sealing assembly; a main shaft sleeve and an input pipe of the granulation nozzle pass through the upper cabin door and are sealed by a packing sealing assembly, the upper cabin door can move up and down the main shaft of the granulation nozzle and the feed pipe, the packing sealing assembly ensures the sealing between the main shaft, the feed pipe and the upper cabin door when the upper cabin door moves; the upper cabin door and the lower cabin door are not opened at the same time, ensuring that at any workstation of the bisphenol A centrifugal granulation nozzle, there is at least one seal between the operation room and the granulation cabin, and no nitrogen overflows into the operation room.

[0005] Preferably, the cabin body passes through the tower plate, the upper end of the cabin body is flush with the upper end of the tower plate, and the lower end of the cabin body is provided with a lower cabin door in the granulation cabin.

[0006] Preferably, it includes a cover plate welded on the main shaft sleeve. When the centrifugal nozzle is in the granulation position, the granulation nozzle installed on the main shaft extends into the granulation cabin of the granulation tower, and the lower cabin door is in an open state. The cover plate presses the opening of the lower cabin door, and the upper cabin door of the airlock cabin presses the upper surface of the tower plate. The working chamber of the granulation tower and the operating room are isolated by two seals.

[0007] Preferably, whether ascending or descending, the centrifugal granulation nozzle must stop when passing through the airlock cabin; when the granulation nozzle ascends, the upper hatch is closed and the lower hatch is opened. After the granulation nozzle ascends into the airlock cabin, the lower hatch is closed first and then the upper hatch is opened; when the granulation nozzle descends, the upper hatch is opened and the lower hatch is closed. After the granulation nozzle descends to the airlock cabin, the upper hatch is closed and then the lower hatch is opened.

[0008] Preferably, when the granulation nozzle is in the maintenance and replacement station, the granulation nozzle is in the operation room, at which time the upper hatch is in an open state and the lower hatch is closed, and the closed lower hatch is used to achieve sealing isolation between the operation room and the granulation cabin.

[0009] Preferably, the packing seal assembly is made of a non-metallic material that can withstand at least 200°C.

[0010] The beneficial effects of the present invention compared with the prior art are as follows: the present invention provides an airlock cabin, which is an isolation chamber arranged between a granulation tower and an operating room at the top of the tower. For a bisphenol granulation tower operating at a slight positive pressure, when replacing a nozzle, the nozzle is not directly placed into the granulation tower from the operating room or lifted from the granulation tower to the operating room, but first stays in the airlock cabin. The upper and lower doors of the airlock cabin are not opened at the same time, ensuring that the granulation tower and the operating room can be in an isolated state under any working conditions. By adopting the airlock cabin, the nitrogen in the granulation tower will not overflow into the operating room to cause safety hazards. The present invention is suitable for a bisphenol A centrifugal nozzle granulation system with nitrogen circulation cooling, which can not only realize the rapid replacement of the granulation nozzle, but also ensure the sealing between the granulation tower and the operating room, and will not cause additional nitrogen consumption and a decrease in the oxygen content in the operating room due to the replacement of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the air lock structure of the centrifugal granulation nozzle of bisphenol A of the present invention (Example 1, the nozzle is located in the granulation tower);

[0012] Figure 2 This is a schematic diagram of the airlock structure of the centrifugal granulation nozzle of bisphenol A of the present invention (Example 2, the nozzle is located in the airlock);

[0013] Figure 3 This is a schematic diagram of the air lock structure of the centrifugal granulation nozzle of bisphenol A of the present invention (Example 3, the nozzle is located in the operating room);

[0014] In the above figure, 1 is a centrifugal granulation nozzle, 2 is a lower hatch, 3 is a cabin, 4 is a feed pipe, 5 is a tower plate, 6 is an upper hatch; 7 is a packing seal assembly, 8 is a granulation nozzle main shaft assembly, 9 is a lifting mechanism, and 10 is a cover plate. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the embodiments.

[0016] The invention provides an air lock cabin which has a simple structure and can realize quick replacement of a rotary nozzle without leakage, and has important practical value in the field of bisphenol A centrifugal nozzle granulation.

[0017] The bisphenol A centrifugal granulation tower involved in the present invention comprises an operation room and a granulation chamber separated by a tower plate, the tower plate 5 has a certain thickness, the airlock chamber is arranged below the operation room, and comprises a chamber body 3, an upper chamber door 6, a lower chamber door 3 and a packing sealing assembly 7; the chamber body passes through the tower plate 5, the upper end of the chamber body is flush with the upper end of the tower plate, and the lower end of the chamber body is installed with the lower chamber door in the granulation chamber.

[0018] The main shaft sleeve and the input pipe (also called the feed pipe) 4 of the granulation nozzle 1 pass through the upper hatch 6 and are sealed by a packing seal assembly 7. The upper hatch 6 can move up and down on the main shaft sleeve and the feed pipe of the granulation nozzle. The packing seal assembly 7 ensures the seal between the main shaft sleeve, the feed pipe and the upper hatch when the upper hatch moves. The upper hatch 6 and the lower hatch 2 are not opened at the same time, ensuring that at any workstation of the bisphenol A centrifugal granulation nozzle, there is at least one seal between the operating room and the granulation cabin, and no nitrogen leaks into the operating room.

[0019] See also Figure 1 In this example, the centrifugal nozzle is in the granulation position. At this time, the granulation nozzle 1 installed on the main shaft extends into the granulation cabin of the granulation tower, the lower hatch 2 of the air lock cabin is in an open state, the cover plate 10 welded on the main shaft sleeve presses the opening of the lower hatch 2 of the air lock cabin, and the upper hatch 6 of the air lock cabin presses the upper surface of the tower plate 5, and the working chamber of the granulation tower is isolated from the operating room by two seals.

[0020] Whether ascending or descending, the centrifugal granulation nozzle must stop when passing through the airlock. When the granulation nozzle 1 ascends, the upper hatch 6 is closed, the lower hatch 2 is opened, and after the granulation nozzle is ascended into the airlock, the lower hatch is closed first and then the upper hatch is opened, and the granulation nozzle continues to ascend; when the granulation nozzle 1 descends, the upper hatch 6 is opened, the lower hatch 2 is closed, the granulation nozzle descends to the airlock, the upper hatch is closed and then the lower hatch is opened, and the granulation nozzle continues to descend. During the ascending and descending process of the granulation nozzle, the upper hatch and the granulation nozzle main shaft sleeve and the feed pipe are sealed by packing.

[0021] See also Figure 2 In this example, the lifting mechanism 9 drives the granulation nozzle main shaft assembly 8 (including the two-stage sleeve and the main shaft in the sleeve) to rise, and the granulation nozzle 1 is lifted into the air lock cabin and the lower hatch 2 is closed. At this time, the upper hatch 6 is stationary and presses the upper surface of the tower plate 5, and the packing seal assembly 7 ensures that there is no leakage between the granulation nozzle main shaft assembly 5, the feed pipe 4 and the upper hatch 6. In Example 2, the air lock cabin is isolated from the operating room and the granulation tower working space.

[0022] See also Figure 3In this example, the granulation nozzle is in the maintenance and replacement station, and the lifting mechanism 9 drives the granulation nozzle main shaft assembly 8 and the upper hatch 6 to rise together. At this time, the granulation nozzle is in the operation room, the upper hatch 6 is in an open state, and the lower hatch 2 is closed, and the nitrogen in the granulation tower will not overflow into the operation room. The granulation nozzle 1 rises to the maintenance station, where the maintenance and replacement of the granulation nozzle can be completed.

[0023] In a preferred embodiment of the present invention, the packing seal assembly 7 can be made of a non-metallic material that can withstand at least 200° C., such as rubber.

[0024] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A bisphenol A centrifugal granulation nozzle airlock cabin, the bisphenol A centrifugal granulation tower comprises an operation room and a granulation cabin separated by a tower plate, characterized in that: The airlock cabin is arranged below the operating room, and comprises a cabin body, an upper cabin door, a lower cabin door and a packing sealing assembly; the main shaft sleeve and the input pipe of the granulating nozzle pass through the upper cabin door and are sealed by the packing sealing assembly; the upper cabin door can move up and down the main shaft and the feed pipe of the granulating nozzle; the packing sealing assembly ensures the seal between the main shaft, the feed pipe and the upper cabin door when the upper cabin door moves; the upper cabin door and the lower cabin door are not opened at the same time, ensuring that at any working position of the bisphenol A centrifugal granulating nozzle, there is at least one seal between the operating room and the granulating cabin, and no nitrogen overflows into the operating room.

2. The airlock according to claim 1, characterized in that: The cabin body passes through the tower plate, the upper end of the cabin body is flush with the upper end of the tower plate, and the lower end of the cabin body is provided with a lower cabin door in the granulation cabin.

3. The airlock according to claim 1, characterized in that: It includes a cover plate welded on the main shaft sleeve. When the centrifugal nozzle is in the granulation position, the granulation nozzle installed on the main shaft extends into the granulation cabin of the granulation tower, and the lower cabin door is in an open state. The cover plate presses the opening of the lower cabin door, and the upper cabin door of the air lock cabin presses the upper surface of the tower plate. The working chamber of the granulation tower and the operating room are isolated by two seals.

4. The airlock according to claim 1, characterized in that: Whether ascending or descending, the centrifugal granulation nozzle must stop when passing through the airlock; when the granulation nozzle ascends, the upper hatch is closed and the lower hatch is opened. After the granulation nozzle ascends into the airlock, the lower hatch is closed first and then the upper hatch is opened; when the granulation nozzle descends, the upper hatch is opened and the lower hatch is closed. After the granulation nozzle descends to the airlock, the upper hatch is closed and then the lower hatch is opened.

5. The airlock according to claim 1, characterized in that: When the granulating nozzle is in the maintenance and replacement station, the granulating nozzle is in the operation room. At this time, the upper hatch is in the open state and the lower hatch is closed. The closed lower hatch is used to achieve the sealed isolation between the operation room and the granulating cabin.

6. The airlock according to claim 1, characterized in that: The packing seal assembly is made of non-metallic material that can withstand at least 200°C.

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