Powder sampler

Abstract

The utility model discloses a powder sampler. The powder sampler comprises a tank body and a nitrogen inlet device, the whole tank body is cylindrical, a conical tank bottom is arranged at the bottom of the tank body, a discharging opening is formed in the bottom of the conical tank bottom, a feeding opening is formed in the center of the top of the tank body, and an exhaust pipe is further arranged on the side portion of the top of the tank body in a communicating mode; a baffle is further arranged on the inner wall of the tank body and used for enabling powder to slowly fall down to prolong the retention time. The nitrogen inlet device comprises a main gas inlet pipe and an annular gas distribution pipe which are communicated with each other, the annular gas distribution pipe is integrally in a circular ring shape, and a plurality of branch gas inlet pipes are uniformly arranged on the annular gas distribution pipe at intervals; the baffle is arranged in the tank body, so that the powder slowly falls down to prolong the retention time, the powder is continuously replaced by nitrogen, propylene monomers adsorbed by the powder are removed, and the pure powder is obtained in the sample collecting tank.

Description

Technical Field

[0001] The utility model relates to the field of polypropylene production, specifically a powder sampler. Background Technique

[0002] Polypropylene is a general synthetic material mainly polymerized from propylene monomers. In the existing polypropylene production process, the reaction raw materials are basically propylene and catalysts. The reaction raw materials propylene and catalysts react in the reactor. As the reaction proceeds, propylene polymerizes to form polypropylene in the reactor. During the reaction process, it is necessary to sample and analyze the propylene slurry.

[0003] For example, the patent with the authorization announcement number CN213580225U discloses a polypropylene SPG production sampling device system, including a reactor for polypropylene slurry reaction and a sampling system. The sampling system includes a sampling pipe, a displacement tank and a sampler. One end of the sampling pipe extends into the reactor, the other end of the sampling pipe is connected to the displacement tank, and a control valve is provided on the sampling pipe; the bottom of the displacement tank is connected to the top of the sampler by a pipeline through a discharge valve; an air outlet is provided at the top of the displacement tank, a heat exchange jacket is arranged outside the displacement tank, and a heat medium fluid inlet pipe and a heat medium fluid outlet pipe are provided on the heat exchange jacket outside the displacement tank.

[0004] The above patent can well realize the sampling work in the polypropylene production process. The whole sampling process has good sealing, greatly improved safety, and is more convenient and fast to operate. It can directly and quickly obtain polypropylene powder for analysis and detection: Although propylene can be vaporized by heating in the above patent, there will still be some propylene monomers in the polypropylene powder after heating. Nitrogen is introduced into the displacement tank to displace the propylene monomers in the material, but there is still a part of the monomers remaining; in the prior art, the displacement effect of the displacement tank on the propylene monomers in polypropylene is not good, and propylene leaks into the atmosphere, which is also easy to cause frostbite to the sampling personnel.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above defects. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a powder sampler to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A powder sampler comprises a tank body and a nitrogen intake device; the tank body is cylindrical as a whole, and a conical tank bottom is provided at the bottom of the tank body, a discharge port is provided at the bottom of the conical tank bottom, a feed port is provided at the center of the top of the tank body, and an exhaust pipe is also connected to the top side of the tank body; a baffle is also provided on the inner wall of the tank body, and the baffle is used to make the powder fall slowly and extend the residence time; the nitrogen intake device comprises a main intake pipe and an annular air distribution pipe that are interconnected, the annular air distribution pipe is in a circular shape as a whole, and a plurality of branch intake pipes are evenly spaced on the annular air distribution pipe, the annular air distribution pipe is located at the bottom of the conical tank bottom, and the branch intake pipes pass through the conical tank bottom and are connected to the inside of the tank body.

[0009] Furthermore, an annular baffle is provided on the inner side of the conical tank bottom. The annular baffle is located directly above the outlet of the branch air inlet pipe, and the outer side of the annular baffle is fixedly connected to the inner wall of the conical tank bottom.

[0010] Furthermore, the inner side of the annular baffle is arranged to be inclined downward.

[0011] Furthermore, the conical tank bottom includes an upper end and a lower end, wherein the upper end and the lower end are fixedly connected by a connecting flange, wherein two connecting flanges are provided and the two connecting flanges are sealedly connected, and one connecting flange is welded to the upper end, and the other connecting flange is connected to the lower end; wherein the annular baffle is welded to the inner side of the lower end, and wherein the branch air intake pipe is also fixedly connected to the bottom of the lower end.

[0012] Furthermore, the baffle is spirally arranged on the inner wall of the tank body as a whole, and the inner side of the baffle is tilted downward to prevent the powder falling on the baffle from being accumulated on the baffle.

[0013] Furthermore, it also includes a sample collecting tank, and the top opening of the sample collecting tank is configured to collect the polypropylene powder discharged from the discharge port.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] Propylene and polypropylene powder enter the separator, a large amount of propylene is discharged to the flare, and the powder falls into the bottom tank. The tank is designed with a baffle to make the powder fall slowly and extend the residence time. Nitrogen continues to replace the powder to remove the propylene monomer adsorbed by the powder; pure powder is obtained in the sample collection tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the powder sampler.

[0017] Figure 2 This is the front view of the powder sampler.

[0018] Figure 3It is a side view of the powder sampler.

[0019] Figure 4 It is a top view of the powder sampler.

[0020] Figure 5 It is Figure 3 the sectional view taken along the A-A direction in

[0021] Figure 6 It is an exploded view of the tank body in the powder sampler. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0023] Please refer to Figures 1-6 , a powder sampler, comprising a tank body 1 and a nitrogen inlet device 2;

[0024] The tank body 1 is integrally cylindrical, the bottom of the tank body 1 is provided with a conical tank bottom 110, the bottom of the conical tank bottom 110 is provided with a discharge port 102, the center of the top of the tank body 1 is provided with a feed port 103, and the side part of the top of the tank body 1 is also communicated with an exhaust pipe 101;

[0025] When this solution is put into use, polypropylene powder enters from the feed port 103, and the nitrogen inlet device 2 injects nitrogen into the tank body 1 to displace the propylene monomer in the polypropylene powder. The propylene monomer is discharged from the exhaust pipe 101 and discharged to the flare; while the polypropylene powder without propylene is discharged from the discharge port 102;

[0026] The nitrogen inlet device 2 includes a main inlet pipe 201 and an annular air distribution pipe 202 that are connected to each other,

[0027] The annular air distribution pipe 202 is integrally circular, and a plurality of branch inlet pipes 203 are evenly spaced on the annular air distribution pipe 202. The annular air distribution pipe 202 is located at the bottom of the conical tank bottom 110, and the branch inlet pipes 203 pass through the conical tank bottom 110 and are connected to the inside of the tank body 1;

[0028] Meanwhile, in this solution, in order to prevent polypropylene powder from entering the branch inlet pipe 203 when it falls, an annular baffle 204 is further provided inside the conical tank bottom 110. The annular baffle 204 is located directly above the outlet of the branch inlet pipe 203, and the outer side of the annular baffle 204 is fixedly connected to the inner wall of the conical tank bottom 110. At the same time, the inner side of the annular baffle 204 is inclined downward;

[0029] The annular baffle 204 covers the outlet of the branch inlet pipe 203, preventing polypropylene powder from entering through the outlet of the branch inlet pipe 203;

[0030] In this solution, since part of the annular baffle 204 is located inside the tank body and the branch inlet pipe 203 is also sealed to the tank body, if the entire tank body is of an integral structure, its structure is relatively complex and it is difficult to repair if components are damaged later. For the convenience of processing, the conical tank bottom 110 is of a two-piece structure. Specifically, the conical tank bottom 110 includes an upper end portion 111 and a lower end portion 112. The upper end portion 111 and the lower end portion 112 are fixedly connected by a connecting flange 113. There are two connecting flanges 113 and they are sealed between each other. One connecting flange is welded to the upper end portion 111, and the other connecting flange 113 is connected to the lower end portion 112. Among them, the annular baffle 204 is welded to the inner side of the lower end portion 112, and the branch inlet pipe 203 is also fixedly connected to the bottom of the lower end portion 112;

[0031] During production, the upper end portion 111 can be produced together with the upper part of the tank body 1, and then the lower end portion 112 is produced separately. During use, the two are fixed by bolts. When subsequent maintenance or replacement is required, the lower end portion 112 can be replaced separately;

[0032] In this solution, in order to improve the poor replacement effect of propylene monomer in the middle tank body 1, this solution adopts the method of increasing the residence time of polypropylene powder in the tank body 1 to enhance the replacement effect of nitrogen gas introduced by the nitrogen gas inlet device 2 and propylene monomer;

[0033] Therefore, in this solution, a baffle 4 is further provided on the inner wall of the tank body 1. The baffle 4 is used to make the powder fall slowly to extend the residence time;

[0034] Specifically, in this solution, the baffle 4 is integrally arranged in a spiral shape on the inner wall of the tank body 1, and the inner side of the baffle 4 is inclined downward to prevent all the powder falling on the baffle 4 from accumulating on the baffle 4.

[0035] It further includes a sample collection tank 3. The top of the sample collection tank 3 is open for collecting the polypropylene powder discharged from the discharge port 102;

[0036] When the utility model is in use, it enters the tank body 1 from the feed inlet 103 at the top. At this time, nitrogen is introduced into the main air inlet pipe 201, and the nitrogen enters the tank body from the branch air inlet pipe 203 on the annular air distribution pipe 202. When the nitrogen contacts the polypropylene powder, the propylene monomer in the polypropylene powder is carried up together and discharged from the exhaust pipe 101 at the top to the flare, while the polypropylene powder without propylene is discharged from the discharge port 102 and finally falls into the sample collection tank 3, and the collection tank obtains pure powder.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, terms such as "set", "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. Powder sampler, comprising a tank body and a nitrogen inlet device; characterized in that, The tank body is cylindrical as a whole, and a conical tank bottom is provided at the bottom of the tank body. A discharge port is provided at the bottom of the conical tank bottom, and a feed port is provided at the center of the top of the tank body. An exhaust pipe is also provided on the top side of the tank body; a baffle is also provided on the inner wall of the tank body, and the baffle is used to allow the powder to fall slowly and extend the residence time; the nitrogen intake device includes a main intake pipe and an annular air distribution pipe which are interconnected. The annular air distribution pipe is in a circular shape as a whole, and a plurality of branch intake pipes are evenly spaced on the annular air distribution pipe, which is located at the bottom of the conical tank bottom, and the branch intake pipes pass through the conical tank bottom and are connected to the inside of the tank body.

2. The powder sampler according to claim 1, wherein An annular baffle is also provided on the inner side of the conical tank bottom. The annular baffle is located directly above the outlet of the branch air inlet pipe, and the outer side of the annular baffle is fixedly connected to the inner wall of the conical tank bottom.

3. The powder sampler according to claim 2, wherein The inner side of the annular baffle is arranged to be inclined downward.

4. The powder sampler according to claim 2, characterized in that, The conical tank bottom includes an upper end and a lower end, wherein the upper end and the lower end are fixedly connected by a connecting flange, wherein two connecting flanges are provided and the two connecting flanges are sealedly connected, and one connecting flange is welded to the upper end, and the other connecting flange is connected to the lower end; wherein the annular baffle is welded to the inner side of the lower end, and wherein the branch air intake pipe is also fixedly connected to the bottom of the lower end.

5. The powder sampler according to claim 4, characterized in that The baffle is arranged on the inner wall of the tank body in a spiral shape as a whole, and the inner side of the baffle is arranged to be inclined downward to prevent all the powder falling on the baffle from being accumulated on the baffle.

6. The powder sampler according to claim 1, wherein It also includes a sample collecting tank, the top opening of which is used to collect the polypropylene powder discharged from the discharge port.

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