Powder turnover device and system for preparing polyolefin catalyst

Abstract

The utility model discloses a powder turnover device and system for preparing polyolefin catalyst, the turnover device comprises a stock bin and a powder output device, the stock bin is provided with a feed port and a discharge port, a powder conveying device comprises a discharge pipe connected with the discharge port and a second blowdown pipe connected into the discharge pipe, and the second blowdown pipe is connected with the discharge port. The second air supplementing pipe is arranged to convey nitrogen to the discharging pipe so that the powder can be in a suspended state in the discharging pipe, and the discharging pipe is prevented from being blocked. According to the technical scheme, the powder output device comprising the discharging pipe and the second air supplementing pipe is arranged at the discharging port of the stock bin, the powder is in a suspended state in the conveying process through nitrogen introduced into the second air supplementing pipe, and the situation that the pipeline is blocked when the powder is conveyed for a long distance is avoided; the problem that an existing turnover barrel cannot continuously convey powder for a long distance is solved, and the powder turnover efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of polyolefin catalyst preparation technology, and in particular to a powder turnover device and system for preparing polyolefin catalyst. BACKGROUND

[0002] In the field of polyolefin catalyst production, the production process of magnesium chloride-based carrier and its corresponding olefin polymerization catalyst is strict, and all production raw materials, production processes and powder products need to be carried out under nitrogen sealing protection. Through a series of production processes, qualified powder semi-finished products are obtained. After the powder semi-finished products are dried and qualified, they are discharged, transported to a screening unit for physical screening under strict nitrogen protection conditions. Different screening processes and equipment are selected according to product requirements to remove irregular materials and agglomerated particles in the powder, and the qualified finished products of different particle sizes are packaged for downstream customers.

[0003] The current turnover method is: first, the powder in the drying equipment is poured into multiple turnover barrels under a nitrogen environment, and then the multiple turnover barrels are hoisted and transported to the screening equipment for physical screening. This method has some problems: the powder cannot be continuously transferred from the drying equipment to the screening equipment, and the material cannot be transported over a long distance; the discharge port of the drying equipment is temporarily connected with multiple turnover barrels, which is prone to powder overflow and contamination of the site environment and other safety problems; the turnover barrel feeding and discharging process requires precise nitrogen charging protection and exhaust gas collection, and the operation requires high skills, has a high risk of operation failure, and has high labor intensity and low efficiency. UTILITY MODEL CONTENTS

[0004] One of the technical problems to be solved by the utility model is that the currently used turnover barrels cannot continuously and long-distance transport the powder from the drying equipment to the screening equipment.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a powder turnover device for preparing polyolefin catalyst, which comprises a stock bin and a powder output device, wherein the stock bin has a feeding port and a discharge port, the powder conveying device comprises a discharge pipe connected with the discharge port and a second air supplement pipe connected with the discharge pipe, and the second air supplement pipe is arranged to convey nitrogen to the discharge pipe to make the powder in the discharge pipe in a suspended state and avoid the blockage of the discharge pipe.

[0006] In some embodiments, a discharge valve is arranged on the discharge pipe, the discharge valve is arranged close to the discharge port, and the connection position of the second air supplement pipe is arranged away from the discharge port.

[0007] In some embodiments, a gas delivery device is further included, the gas delivery device comprising an exhaust pipe and a first nitrogen supplement pipe, the bin having an exhaust port, one end of the exhaust pipe and the first nitrogen supplement pipe being connected to the exhaust port, the exhaust pipe being configured to exhaust residual gas in the bin, and the first nitrogen supplement pipe being configured to supplement nitrogen to the bin.

[0008] In some embodiments, a filter core is arranged at the exhaust port to prevent powder in the bin from flowing out of the exhaust port.

[0009] In some embodiments, the other end of the exhaust pipe is provided with an emptying valve, and the first nitrogen supplement pipe is further configured to back-flush powder in the filter core into the bin when the emptying valve is closed.

[0010] In some embodiments, the feed inlet is connected with a feed pipe, and one end of the feed pipe extending out of the bin is provided with a quick connector.

[0011] In some embodiments, an air hammer is arranged on the outer wall of the lower end of the bin to prevent powder from bridging in the bin.

[0012] In some embodiments, a bracket is arranged on the outer wall of the bin, and a base is connected below the bracket.

[0013] In some embodiments, a slot is arranged below the base, and the width of the slot is configured to accommodate a forklift arm to transport the powder turnover device.

[0014] The second aspect of the present application provides a system for preparing a polyolefin catalyst, comprising the powder turnover device for preparing a polyolefin catalyst, a drying device connected to the feed inlet, and a screening device connected to the discharge outlet.

[0015] By the above technical solution, the powder output device comprising a discharge pipe and a second nitrogen supplement pipe is arranged at the discharge outlet of the bin, and the nitrogen gas introduced by the second nitrogen supplement pipe makes the powder in a suspended state during the conveying process, avoiding blockage in the pipeline during long-distance conveying of the powder, solving the problem that the current turnover barrel cannot continuously and long-distance transport the powder, and greatly improving the powder turnover efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front view of the powder turnover device for preparing a polyolefin catalyst disclosed by the present application;

[0017] Figure 2 is a schematic view of the powder turnover device for preparing a polyolefin catalyst disclosed by the present application.

[0018] REFERENCE SIGNS

[0019] 1. Hopper; 2. Inlet; 3. Feed pipe; 4. Quick connector; 5. Exhaust port; 6. Filter element; 7. Exhaust pipe; 8. Vent valve; 9. First air supply pipe; 10. Outlet; 11. Outlet pipe; 12. Discharge valve; 13. Second air supply pipe; 14. Sleeve; 15. Inlet valve; 16. Pressure gauge; 17. Bracket; 18. Base; 19. Slot; 20. Flange; 21. Air hammer; 22. Hopper. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] To address the problem that existing transfer containers cannot achieve continuous and long-distance transfer of powder from drying equipment to screening equipment, the first aspect of this utility model provides a powder transfer device for preparing polyolefin catalysts, including a silo 1 and a powder output device. The silo 1 has an inlet 2 and an outlet 10. The powder conveying device includes an outlet pipe 11 connected to the outlet 10 and a second air supply pipe 13 connected to the outlet pipe 11. The second air supply pipe 13 is configured to supply nitrogen gas to the outlet pipe 11 so that the powder is in a suspended state in the outlet pipe 11 and to prevent the outlet pipe 11 from being blocked.

[0022] like Figure 1 As shown, hopper 1 can be configured as a tapered cone to ensure even powder distribution and prevent powder splashing during output. Specifically, the volume of hopper 1 can be designed in different specifications to accommodate different batch production volumes of different products, with a maximum capacity of 1500kg. This effectively solves the problem of multiple batches of powder being repackaged and switched between transfer containers, allowing all powder to be repackaged into the transfer device at once, reducing safety, environmental, and quality risks while improving work efficiency.

[0023] A powder output device can be installed at the bottom of the silo 1 and connected to the discharge port 10. Specifically, the discharge port 10 is connected to the discharge pipe 11 of the powder output device to output powder. The second air supply pipe 13 of the powder output device is connected to the discharge pipe 11 and introduces nitrogen into the discharge pipe 11. An air inlet can be opened on the side wall of the discharge pipe 11 and connected to the port of the second air supply pipe 13. To further fix the second air supply pipe 13 and the discharge pipe 11, a sleeve 14 can be fitted onto the outer wall of the discharge pipe 11 and fixedly connected to the port of the second air supply pipe 13. In this way, the powder output device solves the problem of frequent clogging when conveying olefin polymerization catalyst powder over long distances, keeping the powder material in a suspended state during the conveying process and improving the conveying efficiency.

[0024] Through the above technical solution, a powder output device including a discharge pipe 11 and a second air supply pipe 13 is set at the discharge port of the silo 1. The nitrogen gas introduced into the second air supply pipe 13 keeps the powder in a suspended state during the conveying process, avoiding blockage in the pipeline when conveying powder over long distances. This solves the problem that the current turnover drum cannot continuously and over long distances to transport powder, and greatly improves the turnover efficiency of powder.

[0025] In some embodiments, a discharge valve 12 is provided on the discharge pipe 11, the discharge valve 12 is located near the discharge port 10, and the access position of the second air supply pipe 13 is located away from the discharge port 10.

[0026] like Figure 1 As shown, the discharge valve 12 can be used to control the opening and closing of the discharge port 10 of the silo 1 and the discharge amount. By setting the discharge valve 12 close to the discharge port 10 and the connection position of the second air supply pipe 13 far away from the discharge port 10, the nitrogen supplied by the second air supply pipe 13 to the discharge pipe 11 can be prevented from affecting the pressure environment inside the silo 1, and the uniform discharge of the silo 1 can be ensured without blocking the discharge pipe 11.

[0027] In some embodiments, a gas conveying device is also included, comprising an exhaust pipe 7 and a first gas supply pipe 9. The silo 1 has an exhaust port 5, and one end of both the exhaust pipe 7 and the first gas supply pipe 9 is connected to the exhaust port 5. The exhaust pipe 7 is configured to discharge residual gas in the silo 1, and the first gas supply pipe 9 is configured to supply nitrogen to the silo 1. Figure 1 As shown, the hopper 1 of this transfer device is a positive pressure device, therefore nitrogen needs to be introduced into the hopper 1 when the powder is fed in. The first gas supply pipe 9 is configured to replenish nitrogen into the hopper 1. After the hopper 1 completes the powder transfer, the residual gas in the hopper 1 needs to be discharged. The exhaust pipe 7 is configured to discharge the residual gas in the hopper 1. The nitrogen intake and the exhaust of the residual gas are through the exhaust port 5. The other end of the first gas supply pipe 9 is equipped with an intake valve 15 to control the opening and closing of the first gas supply pipe 9 and the nitrogen flow rate.

[0028] In some embodiments, a filter element 6 is installed at the exhaust port 5 to prevent powder in the hopper 1 from flowing out of the exhaust port 5. Due to the characteristics of powder processing in the polyolefin field, discharging and packaging must be carried out under strict nitrogen protection. Therefore, to ensure the product quality of the powder, a metal filter element is installed at the equipment exhaust port, solving the problem of powder being discharged with the exhaust during the discharge process and improving the on-site operating environment. Figure 1 As shown, an exhaust pipe is connected to the exhaust port 5, and the filter element 6 can be set at the central axis of the exhaust pipe to fully filter and intercept the powder in the gas discharged into the exhaust pipe 7.

[0029] In some embodiments, the other end of the exhaust pipe 7 is provided with an air vent valve 8, and the first air supply pipe 9 is also configured to backflush the powder in the filter element 6 into the hopper 1 when the air vent valve 8 is closed.

[0030] As Figure 1 shown, when the adsorbed powder on the filter core 6 reaches the preset amount, the exhaust valve 8 on the exhaust pipe 7 needs to be closed and the inlet valve 15 of the first air supplement pipe 9 needs to be opened, at this time the first air supplement pipe 9 acts as a back flushing pipe to back flush the powder in the filter core 6 into the bin 1, avoiding excessive powder from being continuously discharged into the external air through the exhaust pipe 7 to pollute the environment when the adsorption amount of the filter core 6 is exceeded.

[0031] In some embodiments, the feed inlet 2 is connected with a feed pipe 3, and the end of the feed pipe 3 extending out of the bin 1 is provided with a quick connector. As Figure 1 shown, the feed pipe 3 is preferably provided as a hose and connected with the quick connector, so that when the feed inlet 2 of the bin 1 appears abnormal conditions such as being blocked, it can be quickly disassembled for cleaning, improving the maintenance efficiency of the turnover device.

[0032] In some embodiments, an air hammer 21 is provided on the outer wall of the lower end of the bin 1 to prevent the powder from bridging in the bin 1. As Figure 1 shown, the bin 1 can include a bin body and a hopper 22 connected to the lower end of the bin body, the hopper 22 is provided as a tapered cone to further ensure the smooth and uniform discharge of the powder, and the hopper 22 can be connected to the bin body through a flange 20. Since the bridging phenomenon of the bin 1 often occurs at the discharge outlet 10, the air hammer 21 can be provided on the outer wall of the hopper 22.

[0033] In some embodiments, a support 17 provided on the outer wall of the bin 1 and a base 18 connected below the support 17 are further included. As Figure 1 and 2 shown, the support 17 can be multiple, and the multiple supports 17 can be circumferentially and equally spaced around the bin 1 for supporting the bin 1. The base 18 can be provided below the multiple supports 17 and detachably connected with the multiple supports 17 to support the multiple supports 17 and the bin 1.

[0034] In some embodiments, a slot 19 is provided below the base 8, and the width of the slot 19 is set to be able to accommodate the arm of a forklift to transport the powder turnover device. As Figure 2 shown, the slot 19 can be two groups of channel steels, which are axially symmetrical along the bottom surface of the base 8.

[0035] In addition, considering that the dried and discharged powder needs to be protected by nitrogen after being packaged, a pressure gauge 16 is further provided at the top of the bin 1 to review the pressure holding pressure according to product requirements; considering that it is necessary to regularly analyze various indicators of the product, a sampling port is installed on the discharge pipe 11 at the discharge outlet 10 of the bin 1 to facilitate sampling.

[0036] The utility model discloses a kind of powder turnover systems for preparing polyolefin catalyst, including powder turnover device for preparing polyolefin catalyst, with the dry equipment connected with feed inlet 2, with the screening equipment connected with discharge port 10.

[0037] Wherein, the dry equipment can be carrier reaction kettle, and the screening equipment can be material receiving bin.

[0038] The preferred embodiments of the utility model are described in detail above in combination with drawings, but the utility model is not limited to this. Within the technical concept range of the utility model, the technical solutions of the utility model can be subjected to various simple modifications, including various specific technical features being combined in any suitable manner. In order to avoid unnecessary repetition, the utility model will not further describe various possible combination manners. However, these simple modifications and combinations should also be considered as disclosed content of the utility model, and all belong to the protection scope of the utility model.

Claims

1. A powder transfer device for preparing a polyolefin catalyst, characterized in that, The powder turnover device comprises a bin (1) and a powder output device, wherein the bin (1) has a feeding port (2) and a discharging port (10), the powder output device comprises a discharging pipe (11) connected with the discharging port (10) and a second air supplement pipe (13) connected with the discharging pipe (11), and the second air supplement pipe (13) is arranged to supply nitrogen to the discharging pipe (11) to keep the powder in a suspended state in the discharging pipe (11) and avoid blockage of the discharging pipe (11).

2. A powder transfer device for the preparation of polyolefin catalyst according to claim 1, characterized by the fact that, A discharging valve (12) is arranged on the discharging pipe (11) and is arranged close to the discharging port (10), and the connection position of the second air supplement pipe (13) is arranged away from the discharging port (10).

3. A powder transfer device for making polyolefin catalyst according to claim 1, characterized in that, The device further comprises a gas conveying device, which comprises an exhaust pipe (7) and a first air supplement pipe (9), the bin (1) has an exhaust port (5), one end of the exhaust pipe (7) and the first air supplement pipe (9) are connected with the exhaust port (5), the exhaust pipe (7) is arranged to exhaust residual gas in the bin (1), and the first air supplement pipe (9) is arranged to supplement nitrogen to the bin (1).

4. A powder transfer device for the preparation of polyolefin catalyst according to claim 3, characterized in that, A filter core (6) is arranged at the exhaust port (5) to prevent the powder in the bin (1) from flowing out of the exhaust port (5).

5. A powder transfer device for the preparation of polyolefin catalyst according to claim 4, characterized in that, The other end of the exhaust pipe (7) is provided with an emptying valve (8), and the first air supplement pipe (9) is further arranged to blow the powder in the filter core (6) into the bin (1) when the emptying valve (8) is closed.

6. A powder transfer device for making polyolefin catalyst according to claim 1, characterized in that, The feeding port (2) is connected with a feeding pipe (3), and one end of the feeding pipe (3) extending out of the bin (1) is provided with a quick connector.

7. A powder transfer device for making polyolefin catalyst according to claim 1, characterized in that, An air hammer (21) is arranged on the outer wall of the lower end of the bin (1) to prevent the powder from bridging in the bin (1).

8. A powder transfer device for making polyolefin catalyst according to claim 1, characterized in that, The device further comprises a support (17) arranged on the outer wall of the bin (1) and a base (18) connected below the support (17).

9. A powder transfer device for the preparation of polyolefin catalyst according to claim 8, characterized by the fact that, A slot (19) is arranged below the base (18), and the width of the slot (19) is arranged to be able to accommodate a forklift arm to transfer the powder turnover device.

10. A powder transfer system for the preparation of a polyolefin catalyst, characterized by, The device comprises the powder turnover device for preparing a polyolefin catalyst according to any one of claims 1-9, a drying device connected with the feeding port (2), and a screening device connected with the discharging port (10).

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