CN218871686U - Device for preventing sheet forming of dome of gas-phase polypropylene process reactor - Google Patents

Abstract

The utility model provides a vapor phase polypropylene process reactor dome prevents sheeting device, including at least one spray set that sets up on the reactor dome inner wall, spray set with reactor dome inner wall fixed connection, spray set is connected with the propylene supply source that is located outside the reactor dome through the pipeline, spray set sprays the propylene that the propylene supply source transmitted; the propylene supplied from the propylene supply source is clean liquid phase propylene or filtered recycle quench propylene. The utility model discloses a mode to spraying liquid phase propylene in the reactor dome reduces the formation volume of irregular resin such as sheet stock, lump material among the polymerization process, and then prevents that the reactor dome from piecing together.

Description

Device for preventing sheet forming of dome of gas-phase polypropylene process reactor

Technical Field

The utility model relates to a polypropylene technology reactor dome prevents sheeting technical field, is a gaseous phase polypropylene technology reactor dome prevents sheeting device particularly.

Background

The horizon polypropylene process produces homopolymers, random copolymers, general impact copolymers, and thermoplastic polyolefin elastomers. In contrast to other fluidized bed reactors using vertical stirred reactors or complete mixing, the process employs two horizontal reactors, the first for the production of the homo-polymerization portion and the second for the production of the random copolymerization portion, to produce various high quality impact copolymers. Due to the unique reactor structure and the addition of a high-performance JHC/JHN catalyst, a polypropylene product with high ethylene content and rubber content can be produced.

In the process of producing the impact-resistant polypropylene product, due to the addition of ethylene in the second reaction, the content of random substances in the polypropylene powder is increased, which shows that the viscosity of the powder is greatly increased. In actual production, when the di-trans is used for producing a product with a brand with high ethylene content, polypropylene fine powder carried in the powder falls to the inner wall of the dome under the action of self-gravity or electrostatic adsorption force, a polymerization reaction occurs after a long time, and the phenomenon of polymer wall adhesion is caused on the inner wall of the dome due to the fact that reaction heat cannot be removed in time. When the wall-sticking polymer grows to a certain degree, the wall-sticking polymer falls off, and the problems of sheet materials, block materials and the like are generated in the powder.

SUMMERY OF THE UTILITY MODEL

In light of the above technical problems, a vapor phase polypropylene process reactor dome sheeting prevention device is provided.

The utility model discloses a technical means as follows:

the utility model provides a gaseous phase polypropylene technology reactor dome prevents sheeting apparatus, includes at least one spray set that sets up on reactor dome inner wall, spray set with reactor dome inner wall fixed connection, spray set is connected with through the pipeline and is located the propylene supply source outside the reactor dome, spray set sprays the propylene that the propylene supply source transmitted, and spray the direction with get into the reactor dome in circulation gas flow direction is opposite, when washing away the reactor dome inner wall, reduce the polypropylene fine powder content in the circulation gas.

Preferably, the propylene supplied from the propylene supply source is clean liquid phase propylene or filtered recycle quenched propylene. The propylene used must be kept clean to prevent clogging of the nozzle.

Preferably, the reactor dome comprises a conical cylinder section positioned at the lower part, a straight cylinder section positioned at the upper part and a top cover section positioned at the top part and in an arc shape, and the top cover section is provided with a reactor circulating gas outlet.

Two spraying devices are arranged in the reactor dome, namely a first spraying device and a second spraying device respectively, the first spraying device is positioned at the joint of the conical cylinder section and the straight cylinder section, and the second spraying device is positioned at the top cover section and is lower than the reactor circulating gas outlet;

the spraying range of the first spraying device covers the space surrounded by the conical cylinder section;

the spraying range of the second spraying device covers the space surrounded by the straight cylinder section and the first spraying device.

Propylene circulating gas carrying polypropylene fine powder enters a reactor dome from a reactor from bottom to top, the volume of the propylene circulating gas is gradually enlarged, the gas flow rate is reduced, large-particle polypropylene fine powder falls into the reactor under the action of self gravity to continue reacting, small-particle polypropylene fine powder continuously rises to the upper part of the reactor dome along with the circulating gas, reaches the spraying range of a first spraying device, returns to the reactor to continue reacting after contacting with sprayed propylene, the first spraying device washes the polypropylene fine powder on the conical barrel section clean, the rest small-particle polypropylene fine powder continuously rises to reach the spraying range of a second spraying device, the sprayed propylene is washed wet and falls into the reactor to continue reacting, and the second spraying device washes the inner wall of the straight barrel section and the polypropylene fine powder on the first spraying device clean; and finally, the sprayed and purified reactor circulating gas is discharged from a circulating gas outlet and enters a circulating gas cyclone separator for further treatment.

Preferably, the spray device comprises an annular body and a plurality of spray nozzles disposed on the annular body. The annular body is arranged horizontally.

Preferably, an automatic regulating valve and a mass flow meter are arranged on the pipeline.

Preferably, the propylene has higher pressure difference with the reactor, and the spraying effect of spraying the propylene from the spraying device is ensured.

Preferably, the spraying range of the spraying device is wide enough, so that the inner wall of the dome of the reactor can be washed clean, and simultaneously, the ascending fine powder can be washed.

Preferably, the spray device can be omitted when the reactor is used for producing the homopolymerization grade, but measures for preventing the spray nozzle from being blocked must be taken. When the impact polypropylene or the polyolefin elastomer is produced, the device is intermittently or continuously sprayed, and the flow is adjusted according to the generation content of flakes and blocks in powder. When the number of tablets and blocks increases, the amount of spraying should be increased and vice versa.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model is particularly suitable for the gas phase method polyolefin technology, such as the horizon polypropylene technology, the Innovene polypropylene technology, the SPG polypropylene technology, the Unipol polypropylene technology and the like. The utility model has the advantages that;

1) The generation amount of irregular resins such as sheet materials, lump materials and the like in the polymerization reaction process can be effectively reduced;

2) The carrying amount of fine powder in the circulating propylene gas can be reduced, and the blocking frequency of a condenser, a filter and the like of the circulating gas is reduced;

3) The Horizone polypropylene process can be allowed to continue to produce impact polypropylene grades of higher ethylene content while reducing the number of plant shutdowns.

Based on the reason, the utility model discloses can prevent at polypropylene technology reactor dome field extensive popularization such as flaking.

Drawings

In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a vapor phase polypropylene reactor dome sheeting prevention device according to an embodiment of the present invention.

Fig. 2 is a spraying schematic diagram of the spraying device in the embodiment of the present invention.

Fig. 3 is a top view of the interior of a reactor dome in accordance with an embodiment of the present invention.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at ...above" may include both orientations "at ...above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 to 3, a device for preventing sheeting of a reactor dome in a gas-phase polypropylene process comprises at least one spray device arranged on the inner wall of the reactor dome 1, wherein two spray devices, namely a first spray device 2 and a second spray device 3, are adopted in the embodiment;

the reactor dome 1 comprises a conical cylinder section 11 positioned at the lower part, a straight cylinder section 12 positioned at the upper part and a top cover section 13 positioned at the top part and in an arc shape, and a reactor circulating gas outlet 14 is arranged on the top cover section 13.

The first spraying device 2 is fixed at the joint of the conical cylinder section 11 and the straight cylinder section 12, and the second spraying device 3 is fixed at the top cover section 13 and is lower than the circulating gas outlet 14 of the reactor;

the first spraying device 2 and the second spraying device 3 respectively comprise an annular body and a plurality of nozzles arranged on the annular body, and the annular body is horizontally arranged.

The first spraying device 2 and the second spraying device 3 are connected with a propylene supply source 4 positioned outside the dome of the reactor through pipelines, and the first spraying device 2 and the second spraying device 3 spray propylene transmitted by the propylene supply source 4. The propylene supplied from the propylene supply source 4 is clean liquid phase propylene or filtered circulating quenching propylene, and the adopted propylene needs to be kept clean to prevent the blockage of a nozzle. And an automatic regulating valve and a mass flow meter are arranged on the pipeline. Propylene and reactor have higher pressure differential, guarantee the spraying effect that propylene sprays out from spray set, and spray set's spraying range is wide enough, can wash away reactor dome inner wall clean while can also wash away ascending fine powder.

Propylene circulating gas carrying polypropylene fine powder enters the reactor dome 1 from the reactor from bottom to top, the volume of the propylene circulating gas is gradually enlarged, the gas flow rate is reduced, large-particle polypropylene fine powder falls into the reactor under the action of self gravity to continue reacting, small-particle polypropylene fine powder continuously rises to the upper part of the reactor dome 1 along with the circulating gas, reaches the spraying range of the first spraying device 2, returns to the reactor after contacting with the sprayed propylene to continue reacting, the first spraying device 2 washes the polypropylene fine powder on the conical barrel section 11 clean, the rest small-particle polypropylene fine powder continuously rises, reaches the spraying range of the second spraying device 3, the sprayed propylene is wetted and falls into the reactor to continue reacting, and the second spraying device 3 washes the inner wall of the straight barrel section 12 and the polypropylene fine powder on the first spraying device 2 clean; finally, the sprayed and purified reactor recycle gas is discharged from a recycle gas outlet 14 and enters a recycle gas cyclone separator for further treatment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (6)

1. The device is characterized by comprising at least one spraying device arranged on the inner wall of a reactor dome, wherein the spraying device is fixedly connected with the inner wall of the reactor dome, the spraying device is connected with a propylene supply source positioned outside the reactor dome through a pipeline, the spraying device sprays propylene transmitted by the propylene supply source, the spraying direction is opposite to the flowing direction of circulating gas entering the reactor dome, and the content of polypropylene fine powder in the circulating gas is reduced while the inner wall of the reactor dome is flushed.

2. The vapor phase polypropylene process reactor dome sheeting prevention apparatus of claim 1, wherein the propylene feed source supplies propylene as clean liquid phase propylene or as filtered recycle quench propylene.

3. The vapor phase polypropylene process reactor dome sheeting apparatus as claimed in claim 2, wherein the reactor dome comprises a conical section at a lower portion, a straight section at an upper portion, and a top cover section at a top portion having an arc shape, the top cover section having a reactor recycle gas outlet.

4. The apparatus of claim 3, wherein two of the spray devices are disposed in the reactor dome, namely a first spray device and a second spray device, the first spray device is located at the junction of the conical cylinder section and the straight cylinder section, and the second spray device is located at the top cover section and is lower than the reactor recycle gas outlet;

the spraying range of the first spraying device covers the space surrounded by the conical cylinder section;

the spraying range of the second spraying device covers the space surrounded by the straight cylinder section and the first spraying device.

5. The vapor phase polypropylene process reactor dome sheeting prevention apparatus as claimed in any one of claims 1-4, wherein the spray means comprises an annular body and a plurality of nozzles disposed on the annular body.

6. The apparatus for preventing sheeting in a reactor dome for a gas phase polypropylene process according to any one of claims 1-4, wherein the piping is provided with a self-regulating valve and a mass flow meter.

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