CN219442506U

CN219442506U - Airtight grading system

Info

Publication number: CN219442506U
Application number: CN202223432088.3U
Authority: CN
Inventors: 杨霈霖; 刘付亮; 王长宇; 巩守龙; 刘玉伟
Original assignee: Yankuang Group Yulin Fine Chemical Co ltd
Current assignee: Yankuang Group Yulin Fine Chemical Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-08-01
Anticipated expiration: 2032-12-21

Abstract

The utility model belongs to the technical field of catalyst particle separation, and particularly relates to a closed classification system which comprises a cyclone sieve, a wind inlet, a fluidized bed, cyclone separators, a bag filter and an induced draft fan, wherein a feeding port is formed in the upper side of a cyclone sieve body, a coarse material discharging port and a fine material discharging port are respectively formed in the left side and the right side of the lower side of the cyclone sieve body, the fine material discharging port is communicated with the fluidized bed through a pipeline, the wind inlet is communicated with the fluidized bed through a pipeline, the fluidized bed is communicated with the cyclone separators through a pipeline, the cyclone separators are communicated with the bag filter through a pipeline, the bag filter is communicated with the induced draft fan through a pipeline, discharge ports are formed in the lower sides of the bodies of the fluidized bed, the cyclone separators and the bag filter, and electric control valves are connected to the lower ends of the three discharge ports through pipelines.

Description

Airtight grading system

Technical Field

The utility model relates to the technical field of catalyst particle separation, in particular to a closed classification system.

Background

The iron-based catalyst synthesized by Fischer-Tropsch is required to be subjected to precipitation reaction, impregnation reaction, spray drying, roasting, forming, screening and the like. The catalyst used in the prior coal-to-liquid slurry bed reactor has the granularity of 44-250 mu m and the average grain diameter of 110-130 mu m, so that the catalyst can be uniformly distributed in the slurry bed reactor, thereby being beneficial to heat transfer of the slurry bed reactor and effectively reducing sintering and carbon deposit in the slurry bed reactor.

The catalyst after spray drying forming has granularity ranging from 1 to 300 mu m (in normal distribution), wherein the particle with the particle diameter smaller than 44 mu m accounts for less than 2%, the particle with the particle diameter of 44 to 250 mu m accounts for more than 96%, namely, a certain amount of unqualified products of large particles and fine particles can be generated in the catalyst preparation process; in the prior art, large particles and fine particles in a catalyst are separated through a vibrating screen, but the vibration of the vibrating screen can cause serious abrasion of a soft connection part, namely when the vibrating screen is used, the soft connection part needs to be frequently replaced, the soft connection part is not tightly sealed, and powder leakage phenomenon can occur at the soft connection part; the powder leakage at the soft connection part not only can affect the field environment, but also can easily cause the qualified catalyst to be mixed with unqualified large-particle and fine-particle catalysts.

Disclosure of Invention

The utility model aims to provide a closed classification system to solve the problem that an iron-based catalyst used in the existing coal-to-liquid slurry bed reactor in the background art needs to use a vibrating screen to separate particles with different particle sizes.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a airtight grading system, includes cyclone sieve, air inlet machine, fluidized bed, cyclone, bag filter and draught fan, the feed inlet has been seted up to the body upside of cyclone sieve, coarse fodder discharge port and fine fodder discharge port have been seted up respectively to the left and right sides of cyclone sieve body downside, the fine fodder discharge port passes through pipeline and fluidized bed intercommunication, the air inlet machine passes through pipeline and fluidized bed intercommunication, the fluidized bed passes through pipeline and cyclone intercommunication, cyclone passes through pipeline and bag filter intercommunication, the bag filter passes through pipeline and draught fan intercommunication, the equal discharge gate of body downside of fluidized bed, cyclone and bag filter, three the lower extreme of discharge gate all has automatically controlled valve through the pipe connection.

Preferably, the left and right sides of the lower side of the fluidized bed body are provided with air inlets, two air inlets are respectively connected with gas pressure reducing valves through pipelines, and the two gas pressure reducing valves are respectively communicated with the air inlet machine through the pipelines.

Preferably, a supporting plate is arranged in the inner cavity of the bag filter, a protective tube is arranged below the supporting plate, and a filter bag is arranged in the inner cavity of the protective tube.

Preferably, a sealing plate is arranged above the filter bag, a detachable cover plate is arranged above the supporting plate, and the cover plate and the supporting plate are clamped on the upper side and the lower side of the sealing plate.

Preferably, the body of the cover plate is longitudinally provided with a guide groove, an extrusion plate is movably arranged in the inner cavity of the guide groove, and a compression spring is connected between the upper end of the extrusion plate and the groove wall of the guide groove.

Compared with the prior art, the utility model has the beneficial effects that:

1) The device cancels the use of the vibrating screen, so that the soft connection form of an inlet and an outlet of the vibrating screen can be canceled, and the devices of the device are hard-connected, so that the devices can be completely sealed by the hard-connection, and dust leakage can be prevented;

2) Coarse catalyst with larger particle size is separated by cyclone sieve, then fine catalyst with smaller particle size is separated by fluidized bed, then separation efficiency is improved by adjusting air inlet fan and induced draft fan, and qualified product yield is ensured;

3) The device utilizes the cyclone separator and the bag filter to collect unqualified catalyst dust, and can avoid dust pollution to the environment.

Drawings

FIG. 1 is a schematic view of the device connection structure of the present utility model;

FIG. 2 is a schematic view of a front view of a bag filter of the present utility model in partial structural section;

FIG. 3 is an enlarged schematic view of the structure A in FIG. 2 according to the present utility model;

FIG. 4 is a schematic cross-sectional view of a cover plate of the present utility model.

In the figure: 1 cyclone sieve, 2 air inlet machine, 3 fluidized bed, 4 cyclone separator, 5 bag filter, 6 induced draft fan, 51 backup pad, 52 apron, 53 protective tube, 54 filter bag, 55 closing plate, 56 stripper plate, 57 compression spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples:

referring to fig. 1-4, the present utility model provides a technical solution: a closed classification system comprises a cyclone screen 1, a wind inlet machine 2, a fluidized bed 3, a cyclone separator 4, a bag filter 5 and a draught fan 6, wherein a feed inlet is formed in the upper side of a body of the cyclone screen 1, a coarse material discharge outlet and a fine material discharge outlet are respectively formed in the left side and the right side of the lower side of the body of the cyclone screen 1, an iron-based catalyst is added from the feed inlet and then screened in the cyclone screen 1, wherein the iron-based catalyst with the particle size smaller than 250 mu m can pass through a screen and then be discharged from the fine material discharge outlet, the iron-based catalyst with the particle size larger than 250 mu m can not pass through the screen and can only be discharged from the coarse material discharge outlet, the lower ends of the three discharge outlets are connected with an electric control valve through pipelines, the cyclone screen 1 is communicated with the fluidized bed 3 through the pipelines, the iron-based catalyst with the particle size smaller than 250 mu m is discharged from a fine material discharge port and then enters a fluidized bed 3, and then the iron-based catalyst is separated by the fluidized bed 3, wherein the iron-based catalyst with the particle size smaller than 44 can enter a cyclone 4 through the fluidized bed 3, the iron-based catalyst with the particle size within the range of 44-250 mu m is normally discharged from a discharge port of the fluidized bed 3, the iron-based catalyst with the particle size within the range accords with the requirement of a coal-to-oil slurry bed reactor, an air inlet machine 2 is communicated with the fluidized bed 3 through a pipeline, an air inlet machine 2 is used for feeding air flow into the fluidized bed 3, the fluidized bed 3 is communicated with the cyclone 4 through a pipeline, the cyclone 4 can be used for capturing dust with the diameter of more than 5 mu m, namely, the iron-based catalyst dust with the particle size of 5-44 mu m can be captured by the cyclone 4 and discharged from the discharge port, the iron-based catalyst dust with the particle size smaller than 5 mu m can enter a bag filter 5, the cyclone separator 4 is communicated with the bag filter 5 through a pipeline, the bag filter 5 is used for filtering iron-based catalyst dust with the particle size smaller than 5 mu m, the filtered iron-based catalyst dust is discharged from a discharge port at the lower end of the bag filter 5, the bag filter 5 is communicated with the induced draft fan 6 through a pipeline, and then filtered air is led out by the induced draft fan 6.

The left and right sides of the lower side of the fluidized bed 3 body are respectively provided with an air inlet, the two air inlets are respectively connected with an air pressure reducing valve through pipelines, the two air pressure reducing valves are respectively communicated with the air inlet machine 2 through the pipelines, and the air pressure of the air inlet machine 2 fed into the fluidized bed 3 is regulated through the air pressure reducing valves, so that the fluidized bed 3 can be kept in a micro negative pressure-5 mbar state under the suction action of the air inlet machine 2 and the induced draft fan 6.

The inner cavity of the bag filter 5 is provided with the supporting plate 51, the lower part of the supporting plate 51 is provided with the protecting tube 53, the inner cavity of the protecting tube 53 is provided with the filter bag 54, the upper part of the filter bag 54 is provided with the sealing plate 55, the upper part of the supporting plate 51 is provided with the detachable cover plate 52, the cover plate 52 and the supporting plate 51 are clamped on the upper side and the lower side of the sealing plate 55, the sealing plate 55 can be kept in a sealing state with the supporting plate 51 through the extrusion of the cover plate 52 and the supporting plate 51, a plurality of groups of filter bags 54 can be used in the bag filter 5, the sealing is formed through the extrusion of the cover plate 52, and the rapid installation of the plurality of groups of filter bags 54 can be facilitated.

The body of apron 52 has seted up the guide way in vertical, and movable mounting has stripper plate 56 in the inner chamber of guide way, is connected with compression spring 57 between the cell wall of stripper plate 56 upper end and guide way, makes stripper plate 56 have the activity space through compression spring 57's elasticity here, conveniently forms extrusion seal to stripper plate 56.

Working principle: the roasted iron-based catalyst is blown into a cyclone screen 1 after spray drying, coarse (particle size is larger than 250 mu m) is screened by the cyclone screen 1, the rest iron-based catalyst enters a fluidized bed 3, at the moment, the fluidized bed 3 can be kept in a micro negative pressure (-5 mbar) state under the suction action of an air inlet machine 2 and an induced draft fan 6, so that the fluidized bed 3 can conveniently and thoroughly separate fine powder with particle size smaller than 44 mu m in the iron-based catalyst, finished products of the iron-based catalyst (with particle size smaller than 44 mu m) are collected after separation, the separated fine powder (with particle size smaller than 44 mu m) is blown into a cyclone separator 4, the fine powder (with particle size larger than 5 mu m) is captured by the cyclone separator 4, then the rest fine powder (with particle size smaller than 5 mu m) which is not captured enters a bag filter 5, the bag filter 5 is collected, and finally air from which dust is removed is discharged through an outlet of the induced draft fan 6.

While the fundamental and principal features of the utility model and advantages of the utility model have been shown and described, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a airtight grading system, includes cyclone sieve (1), air inlet machine (2), fluidized bed (3), cyclone (4), bag filter (5) and draught fan (6), its characterized in that: the cyclone screen (1) is characterized in that a feeding hole is formed in the upper side of the cyclone screen (1), a coarse material discharge hole and a fine material discharge hole are formed in the left side and the right side of the lower side of the cyclone screen (1) respectively, the fine material discharge hole is communicated with a fluidized bed (3) through a pipeline, an air inlet machine (2) is communicated with the fluidized bed (3) through a pipeline, the fluidized bed (3) is communicated with a cyclone separator (4) through a pipeline, the cyclone separator (4) is communicated with a bag filter (5) through a pipeline, the bag filter (5) is communicated with a draught fan (6) through a pipeline, and the lower sides of the fluidized bed (3), the cyclone separator (4) and the bag filter (5) are all provided with discharge holes, and the lower ends of the discharge holes are all connected with electric control valves through pipelines.

2. A closed classification system according to claim 1, wherein: the left and right sides of the lower side of the fluidized bed (3) body are provided with air inlets, two air inlets are respectively connected with gas pressure reducing valves through pipelines, and the two gas pressure reducing valves are respectively communicated with an air inlet machine (2) through the pipelines.

3. A closed classification system according to claim 1, wherein: the inner cavity of the bag filter (5) is provided with a supporting plate (51), a protection pipe (53) is arranged below the supporting plate (51), and a filter bag (54) is arranged in the inner cavity of the protection pipe (53).

4. A closed classification system according to claim 3, wherein: the top of filter bag (54) is provided with closing plate (55), detachable apron (52) are installed to the top of backup pad (51), apron (52) and backup pad (51) centre gripping are in closing plate (55) upside down.

5. The containment fractionation system of claim 4 wherein: the body of apron (52) has seted up the guide way in vertical, movable mounting has stripper plate (56) in the inner chamber of guide way, be connected with compression spring (57) between the cell wall of stripper plate (56) upper end and guide way.