CN115143761A - Process system and method for fluidized dealkylation drying - Google Patents

Abstract

The invention belongs to the technical field of powder processing, and particularly relates to a process system and a method for fluidization, dealkylation and drying. According to the invention, through the design of the perforated plate and the first weir plate, the gas can be ensured to be uniformly and fully contacted with the material, so that the effects of inactivating the catalyst and removing the hydrocarbon substances in the powder are ensured; therefore, the invention can improve the powder dealkylation efficiency, simultaneously ensure the drying of the powder, further ensure the safety of the operation of downstream devices and the safety of powder storage and transportation, and reduce the peculiar smell of products.

Description

Process system and method for fluidized dealkylation drying

Technical Field

The invention belongs to the technical field of powder processing, and particularly relates to a process system and a method for fluidized dealkylation drying.

Background

In a polymerization reaction, a polymerization product may take on various states depending on the process and physical properties, and it is typical that the polymer is discharged from a reactor in the form of solid powder, such as a gas phase polyolefin process. When the solid polymer is discharged from the reactor, a small amount of non-deactivated catalyst and non-reacted monomer often remain in the polymer powder, and these impurities must be removed in a degassing and drying system, in order to ensure the safety of the operation of downstream equipment such as granulation and pneumatic conveying, and the safety of storage and transportation of polyolefin products, minimize the consumption of comonomer and reduce the off-flavor of the products.

In order to improve the safety of polyolefin, it is necessary to remove volatile substances with low molecular weight from the polyolefin produced during the production process, and the effect of the method for removing volatile substances with low molecular weight in the prior art is not ideal.

Disclosure of Invention

The invention aims to solve the problem of non-ideal hydrocarbon removal effect in the prior art, and provides a process system and a method for fluidized hydrocarbon removal drying.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a process system for fluidization and dealkylation drying comprises a fluidization and dealkylation drying device and a gas conveying device connected with the fluidization and dealkylation drying device, wherein the gas conveying device comprises a steam heater connected with a gas inlet at the bottom of the fluidization and dealkylation drying device and a bag filter connected with a gas outlet at the top of the fluidization and dealkylation drying device, a porous plate used for uniformly dispersing gas and a first weir plate used for ensuring full contact between the gas and materials are arranged inside the fluidization and dealkylation drying device.

Preferably, the steam heater, the fluidized dehydrocarbon drying device bag filter and the steam heater are connected in sequence to form a gas circulation flow channel.

Preferably, the first weir plate is vertically arranged above the porous plate, and a gap is arranged between the first weir plate and the porous plate.

Preferably, the perforated plate is obliquely arranged, a discharge port is arranged above the lower side of the perforated plate of the fluidization and dealkylation drying equipment, and one end of the discharge port, which is far away from the fluidization and dealkylation drying equipment, is connected with the hopper.

Preferably, rotary valves are arranged between the discharge port and the hopper and between the bag filter and the hopper.

Preferably, the top of the fluidization and dealkylation drying equipment is provided with a feed inlet, and the feed inlet and the discharge outlet are respectively arranged on the left side and the right side of the first weir plate.

Preferably, the first weir plate is provided with a plurality of through holes, and the lower side of the porous plate is also provided with a discharge opening.

A process method for fluidized de-hydrocarbon drying is based on the above process system for fluidized de-hydrocarbon drying, and comprises the following steps:

nitrogen containing a small amount of air and water vapor enters the fluidization and dealkylation drying equipment from the air inlet and is uniformly dispersed through the porous plate;

the material enters the fluidization and dealkylation drying equipment from the feeding hole, the contact time of gas and the material can be prolonged under the action of the first weir plate, part of gas continuously and uniformly passes through the material, the material is dried, the catalyst is deactivated, and hydrocarbon substances in the material are removed;

the material after the dealkylation flows into the other side of the fluidized dealkylation drying equipment through a gap between the first weir plate and the porous plate along the inclined direction of the porous plate, and flows out of the discharge port and enters the hopper; meanwhile, the waste gas with the hydrocarbon substances is discharged into the bag filter through the gas outlet.

After the technical scheme is adopted, the process system and the method for fluidized dealkylation drying provided by the invention have the following beneficial effects:

when the device is used, nitrogen containing a small amount of air and water vapor is added from the bottom of the conditioning tank according to a certain proportion, and through the design of the perforated plate and the first weir plate, the gas can be ensured to be uniformly and fully contacted with materials, so that the effects of inactivating the catalyst and removing hydrocarbon substances in powder are ensured; therefore, the invention can improve the powder dealkylation efficiency, simultaneously ensure the drying of the powder, further ensure the safety of the operation of downstream devices and the safety of powder storage and transportation, and reduce the peculiar smell of products.

Drawings

FIG. 1 is a schematic diagram of a process system for fluidized de-hydrocarbon drying according to the present invention.

Wherein: the device comprises a fluidization and dealkylation drying device 1, a gas conveying device 2, a gas inlet 3, a steam heater 4, a gas outlet 5, a bag filter 6, a porous plate 7, a first weir plate 8, a discharge port 9, a hopper 10, a rotary valve 11, a feed port 12 and a discharge port 13.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which, as is apparent, the described embodiments are only some embodiments of the 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 according to the present application. 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 as such, it is understood that, the relative arrangement of the parts 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 one 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 is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered 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 … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown 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 term "above … …" may include both orientations of "above … …" and "below … …". 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 have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in figure 1, the invention provides a process system for fluidized de-hydrocarbon drying, which comprises a fluidized de-hydrocarbon drying device 1, a gas conveying device 2 connected with the fluidized de-hydrocarbon drying device 1, wherein the gas conveying device 2 comprises a steam heater 4 connected with a gas inlet 3 at the bottom of the fluidized de-hydrocarbon drying device, and a bag filter 6 connected with a gas outlet 5 at the top of the fluidized de-hydrocarbon drying device, a porous plate 7 for uniformly dispersing gas and a first weir plate 8 for ensuring sufficient contact between the gas and materials are arranged inside the fluidized de-hydrocarbon drying device 1.

In this embodiment steam heater 4, fluidization drying equipment 1 bag filter 6 and steam heater 4 link to each other in order and constitute gas circulation flow path, first weir plate 8 sets up perpendicularly in the top of perforated plate 7, and is equipped with the clearance between first weir plate 8 and the perforated plate 7, perforated plate 7 slope sets up, fluidization drying equipment 1 that takes off hydrocarbon is located the top of the lower one side of perforated plate 7 and is equipped with discharge gate 9, hopper 10 is connected to the one end that fluidization drying equipment 1 takes off hydrocarbon 1 is kept away from to discharge gate 9, all be equipped with rotary valve 11 between discharge gate 9 and the hopper 10 to and between bag filter 6 and the hopper 10, fluidization drying equipment 1 top is equipped with feed inlet 12, feed inlet 12 and discharge gate 9 set up the left and right sides at first weir plate 8 respectively, be equipped with a plurality of through-holes on first weir plate 8, the lower one side of perforated plate 7 still is equipped with discharge opening 13.

The invention also provides a process method for fluidized dehydrocarbon drying, which is based on the process system for fluidized dehydrocarbon drying and comprises the following steps:

nitrogen containing a small amount of air and water vapor enters the fluidized hydrocarbon removal drying equipment 1 from the air inlet 3 and is uniformly dispersed through the porous plate 7;

the material enters the fluidized dehydrocarbon drying equipment 1 from the feed inlet 12, the contact time of the gas and the material can be increased under the action of the first weir plate 8, continuously and uniformly passing part of gas through the material, drying the material, inactivating the catalyst and removing hydrocarbon substances in the material;

the material after the dealkylation flows into the other side of the fluidization dealkylation drying equipment 1 along the inclined direction of the porous plate 7 through a gap between the first weir plate 8 and the porous plate 7, and flows out of the discharge hole 9 and enters the hopper 10; simultaneously, the exhaust gas with the hydrocarbons is discharged through the outlet 5 into the bag filter 6.

In conclusion, the process system and the method for fluidized dealkylation drying provided by the invention can improve powder dealkylation efficiency, ensure the drying of the powder, further ensure the running safety of a downstream device and the storage and transportation safety of the powder, and reduce the peculiar smell of the product.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. A process system for fluidized de-hydrocarbon drying is characterized by comprising a fluidized de-hydrocarbon drying device (1), a gas conveying device (2) connected with the fluidized de-hydrocarbon drying device (1), wherein the gas conveying device (2) comprises a steam heater (4) connected with a gas inlet (3) at the bottom of the fluidized de-hydrocarbon drying device and a bag filter (6) connected with a gas outlet (5) at the top of the fluidized de-hydrocarbon drying device, a porous plate (7) used for uniformly dispersing gas and a first weir plate (8) used for ensuring full contact between the gas and materials are arranged inside the fluidized de-hydrocarbon drying device (1).

2. A process system for fluidized de-hydrocarbon drying according to claim 1, wherein: the steam heater (4), the fluidized hydrocarbon-removing drying equipment (1), the bag filter (6) and the steam heater (4) are connected in sequence to form a gas circulation flow channel.

3. A process system for fluidized de-hydrocarbon drying according to claim 1, wherein: first weir plate (8) set up the top at perforated plate (7) perpendicularly, and are equipped with the clearance between first weir plate (8) and the perforated plate (7).

4. A process system for fluidized de-hydrocarbon drying according to claim 1, wherein: the perforated plate (7) is obliquely arranged, a discharge port (9) is arranged above the lower side of the perforated plate (7) of the fluidization and dealkylation drying equipment (1), and one end of the discharge port (9) far away from the fluidization and dealkylation drying equipment (1) is connected with a hopper (10).

5. A process system for fluidized de-hydrocarbon drying according to claim 4, wherein: rotary valves (11) are arranged between the discharge port (9) and the hopper (10) and between the bag filter (6) and the hopper (10).

6. A process system for fluidized de-hydrocarbon drying according to claim 4, wherein: the top of the fluidization and dealkylation drying equipment (1) is provided with a feed inlet (12), and the feed inlet (12) and the discharge outlet (9) are respectively arranged at the left side and the right side of the first weir plate (8).

7. A process system for fluidized de-hydrocarbon drying according to claim 1, wherein: a plurality of through holes are arranged on the first weir plate (8), and a discharge opening (13) is further arranged on the lower side of the porous plate (7).

8. A process for fluidized de-hydrocarbon drying, characterized by: a process system for fluidized de-hydrocarbon drying according to any one of claims 1 to 7, comprising the steps of:

nitrogen containing a small amount of air and water vapor enters the fluidized hydrocarbon-removing drying equipment (1) from the air inlet (3) and is uniformly dispersed through the porous plate (7);

the material enters the fluidized dealkylation drying equipment (1) from the feeding hole (12), the contact time of gas and the material can be prolonged under the action of the first weir plate (8), part of gas continuously and uniformly passes through the material, the material is dried, the catalyst is deactivated, and hydrocarbon substances in the material are removed;

the material after the hydrocarbon removal flows into the other side of the fluidized hydrocarbon removal drying equipment (1) along the inclined direction of the porous plate (7) through a gap between the first weir plate (8) and the porous plate (7), and flows out of the discharge hole (9) and enters the hopper (10); meanwhile, the waste gas with the hydrocarbon substances is discharged into a bag filter (6) through a gas outlet (5).

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