Screening device for finely controlling particle size of catalyst
By using a multi-stage sieving device to precisely control the catalyst particle size, the problem of uneven catalyst particle size distribution in the prior art is solved, ensuring the activity and stability of the catalyst in the low-temperature Fischer-Tropsch synthesis reaction and preventing the occurrence of adverse phenomena.
Patent Information
- Application Number
- CN202423212824.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing technologies cannot precisely control the particle size distribution of iron-based catalysts for low-temperature Fischer-Tropsch synthesis, resulting in their inability to achieve uniform distribution in slurry bed reactors, affecting reaction activity and easily causing adverse phenomena such as sintering and coking.
A sieving device for precise control of catalyst particle size is adopted, including a silo, a primary sieving mechanism, a secondary sieving mechanism and an exhaust fan. Through multi-stage sieving and airflow separation, the precise control of catalyst particle size is achieved, ensuring that the catalyst particle size is concentrated in the range of 44-150μm.
This technology enables precise control of catalyst particle size, ensuring good catalyst activity during the reaction, preventing sintering and coking, and improving catalyst quality and yield.
Smart Images
Figure CN223669678U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of catalyst screening, more particularly to a screening device for fine control of catalyst particle size. BACKGROUND
[0002] The main component of the iron-based catalyst used in low-temperature Fischer-Tropsch synthesis is iron oxide. For a Fischer-Tropsch synthesis device, the particle size distribution of the iron-based catalyst has very strict requirements, which specifically means that the particle size distribution should be as narrow as possible, and in particular, should be concentrated in the specific range of 44-150 μm. Only in this way, the iron-based catalyst can be uniformly distributed in the slurry bed reactor, thereby ensuring good reaction activity and effectively inhibiting adverse phenomena such as sintering and carbon deposition. In the actual process of low-temperature Fischer-Tropsch synthesis iron-based catalyst, the particle size of the catalyst obtained only by the process of spray drying is normally distributed, with a particle size range of 1-300 μm, which cannot meet the need for narrow-range screening precision. Therefore, there is an urgent need for a screening device that can finely control the particle size of the catalyst. SUMMARY
[0003] In view of the above, the utility model aims to provide a screening device for fine control of catalyst particle size to at least partially solve the technical problem that the catalyst cannot be finely screened in the prior art.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0005] A screening device for fine control of catalyst particle size comprises:
[0006] a stock bin;
[0007] a primary screening mechanism installed below the stock bin, with its feed inlet communicating with the discharge outlet at the bottom of the stock bin, and a coarse material outlet at its lower part communicating with a coarse material collection bag;
[0008] a secondary screening mechanism comprising a fluidized bed, a blower, a cyclone separator, and an ultrasonic swing screen, the feed inlet of the fluidized bed communicating with the discharge outlet at the upper part of the primary screening mechanism, and a first qualified product outlet at the lower layer of the fluidized bed communicating with the qualified product collection bag; the gas outlet of the blower communicates with the inner cavity of the fluidized bed through the inner bottom wall of the fluidized bed to blow air into the fluidized bed to make the material flow in layers; the feed inlet of the cyclone separator communicates with the exhaust port at the upper layer of the fluidized bed; the feed inlet of the ultrasonic swing screen communicates with the discharge outlet at the bottom of the cyclone separator, a second qualified product outlet at the lower part of the ultrasonic swing screen communicates with the qualified product collection bag, and a fine material outlet at the bottom communicates with a first fine material collection bag;
[0009] An exhaust fan, an air inlet end of the exhaust fan is communicated with the exhaust port of the upper part of the cyclone separator and the exhaust port of the upper part of the ultrasonic swinging screen.
[0010] The utility model discloses a beneficial effect can be realized: the catalyst stored in the stock bin is discharged from the bottom of the stock bin, and the coarse material is screened out through the first screening mechanism, and the remaining material is layered under the action of the blower through the fluidized bed, the fine material is suspended in the upper layer of the fluidized bed, and the qualified product is intercepted in the lower layer of the fluidized bed and is discharged into the qualified product collecting bag; the upper layer fine material enters the cyclone separator and the ultrasonic swinging screen in turn, and the fine material is discharged into the fine material bag after screening, and the qualified product is discharged into the qualified product collecting bag, and the fine screening and collection are completed, so that the catalyst of target particle size is obtained, and the exhaust fan and the blower cooperate to ensure that the inside of the second screening mechanism is in a micro-negative pressure state, and the flow direction of the airflow is stable.
[0011] Preferably, the first screening mechanism is an airflow screen.
[0012] Preferably, the screening particle size of the first screening mechanism is 1-150 microns.
[0013] Preferably, the screening particle size of the fluidized bed is 44-150 microns.
[0014] Preferably, the screening particle size of the cyclone separator is 22-150 microns.
[0015] Preferably, the screening particle size of the ultrasonic swinging screen is 44-150 microns.
[0016] Preferably, a bag filter is further provided, the bag filter is installed at the air inlet end of the exhaust fan, the air inlet of the bag filter is communicated with the exhaust port of the cyclone separator and the exhaust port of the ultrasonic swinging screen, and the discharge port at the bottom is communicated with the fine material collecting bag.
[0017] Preferably, the screening particle size of the bag filter is 1-22 microns.
[0018] Preferably, the discharge port at the bottom of the stock bin, the first qualified product outlet, the discharge port at the bottom of the cyclone separator, the second qualified product outlet and the discharge port at the bottom of the bag filter are all provided with a rotary discharge valve.
[0019] Compared with the prior art, the utility model discloses a screening device for fine control of catalyst particle size, which screens out coarse material through the first screening mechanism, separates qualified product material and fine material through multiple screening in the second screening mechanism, so as to obtain catalyst of target particle size, and further ensure that the catalyst has good reaction activity in the reaction. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.
[0021] Figure 1 The present application provides a screening device structure schematic diagram for fine control of catalyst particle size.
[0022] In the figure: 1, stock bin, 2, primary screening mechanism, 3, fluidized bed, 4, blower, 5, cyclone separator, 6, ultrasonic swing screen, 7, exhaust fan, 8, coarse material collection bag, 9, qualified product collection bag, 10, first fine material collection bag, 11, bag filter, 12, second fine material collection bag. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0026] Please refer to Figure 1The utility model discloses a kind of screening devices of fine control catalyst particle size, comprising: bunker 1, primary screening mechanism 2, secondary screening mechanism and exhaust fan 7, bunker 1 is high bunker, primary screening mechanism 2 is installed below bunker 1 and its feed inlet is communicated with the discharge port of the bottom of bunker 1, the coarse material outlet of its lower part is communicated coarse material collection bag 8;
[0027] Secondary screening mechanism includes fluidized bed 3, air blower 4, cyclone 5 and ultrasonic swing screen 6, the feed inlet of fluidized bed 3 is communicated with the discharge port of the upper part of primary screening mechanism 2, and the first qualified product outlet of its lower layer is communicated with qualified product collection bag 9;Air blower 4 is placed below fluidized bed 3, and the gas outlet end thereof is communicated with the inner cavity of fluidized bed 3 through the inner bottom wall of fluidized bed 3 to blow air into fluidized bed 3 to make material stratified flow;The feed inlet of cyclone 5 is communicated with the exhaust port of the upper layer of fluidized bed 3;Ultrasonic swing screen 6 is located below cyclone 5, and the feed inlet of its top is communicated with the discharge port of the bottom of cyclone 5, and the second qualified product outlet of its lower part is communicated with qualified product collection bag 9, and the fine material outlet of the bottom is communicated with first fine material collection bag 10;The air inlet end of exhaust fan 7 is communicated with the exhaust port of the upper part of cyclone 5 and the exhaust port of the upper part of ultrasonic swing screen 6.
[0028] In the embodiment, the catalyst stored in bunker 1 is discharged from the bottom of bunker 1, passes through primary screening mechanism 2, and the coarse material is screened out, and the remaining material is stratified by fluidized bed 3, the fine material is suspended in the upper layer of fluidized bed 3, and the qualified product is intercepted in the lower layer of fluidized bed 3 and discharged into qualified product collection bag 9;The upper layer fine material enters cyclone 5 and ultrasonic swing screen 6 in turn, and after screening, the fine material is discharged to fine material bag, the qualified product is discharged to qualified product collection bag 9, fine screening and collection are completed, and the catalyst with target particle size is obtained.
[0029] Specifically, primary screening mechanism 2 is air flow screen.
[0030] Specifically, the screening particle size of primary screening mechanism 2 is 1-150 μm, the catalyst in the range enters fluidized bed, and the material larger than 150 μm falls into coarse material collection bag 8 to screen out coarse material larger than target particle size. In actual application, due to the structure limitation of air flow screen, a small amount of catalyst in the range of 150 μm-250 μm may also enter fluidized bed 3.
[0031] Specifically, the fluidized bed 3 screens the particle size of 44-150 μm, and after the screening of the fluidized bed, the material of 44-150 μm enters the qualified product collection bag, and the material of 1-150 μm in the upper layer enters the cyclone for further screening, so as to screen out part of the qualified material. At this time, if there is a small amount of catalyst in the range of 150 μm-250 μm as in the above step, the small amount of catalyst also enters the qualified product collection bag, but since the content of this part of the catalyst is small, it basically will not affect the activity of the catalytic reaction, so it is also allowed.
[0032] Specifically, the cyclone 5 screens the particle size of 22-150 μm, and discharges the fine material.
[0033] Specifically, the ultrasonic swing screen 6 screens the particle size of 44-150 μm, screens out part of the qualified material, and discharges the fine material.
[0034] Specifically, the bag filter 11 is installed at the air inlet end of the exhaust fan 7, the air inlet thereof is communicated with the air outlet of the cyclone 5 and the air outlet of the ultrasonic swing screen 6, and the bottom discharge port is communicated with the second fine material collection bag 12, so as to filter the exhaust gas to be discharged, intercept the dust particles, and prevent the exhaust gas from being discharged into the atmosphere to cause pollution.
[0035] Specifically, the bag filter 11 screens the particle size of 1-22 μm.
[0036] Specifically, the bottom discharge port of the bin 1, the first qualified product outlet, the bottom discharge port of the cyclone 5, the second qualified product outlet, and the bottom discharge port of the bag filter 11 are all installed with a rotary discharge valve.
[0037] Working principle:
[0038] The catalyst material in the high-positioned bin 1 enters the air flow screen through the rotating discharge valve. In this step, the catalyst material with a particle size greater than 150 μm is screened out and collected into the coarse material collection bag 8 through the screening of the air flow screen. The catalyst material with a particle size less than 150 μm continues to enter the fluidized bed 3 to carry out further separation operation. The fluidized bed 3 is stably operated under the-3--2 mbar micro-negative pressure state created by the exhaust fan 7. Under the mutual coordination of the air blower 4 and the exhaust fan 7, the catalyst material in the bed layer is in a fluidized state. In this case, the fine powder is suspended in the upper layer of the qualified particle size catalyst, and the qualified particle size material is discharged into the qualified product collection bag 9. The fine powder enters the cyclone separator 5 along with the air flow, and it is noted that the fine powder still contains a certain amount of qualified particle size catalyst. When the fine powder enters the cyclone separator 5, the qualified particle size catalyst material therein enters the ultrasonic swing screen 6 through the rotating discharge valve provided in the cyclone separator 5, and the dust particles enter the bag filter 11, and are collected into the second fine material collection bag 12 after filtration, and the clean air is discharged by the exhaust fan 7. After the fine screening treatment of the ultrasonic swing screen 6, the qualified particle size catalyst meeting the requirements is discharged from the second qualified product outlet on the left side of the ultrasonic swing screen 6, enters the qualified product packaging system through the rotating discharge valve, and the unqualified particle size material enters the first fine material collection bag 10 from the fine material outlet on the right side of the ultrasonic swing screen 6.
[0039] The utility model has obvious advantage, it can not only realize fine control to catalyst particle size, but also can very high efficiency control catalyst particle size in 44-150 mu this ideal range, make catalyst product in yield and quality these two key aspects can obtain double protection, thus has more extensive practicality in practical application.
[0040] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.
[0041] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the utility model. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A screening device for fine control of catalyst particle size, characterized by, The invention relates to a powder screening device comprising: a hopper (1); a first screening mechanism (2) installed below the hopper (1) and having its inlet communicating with the outlet of the bottom of the hopper (1) and its coarse material outlet communicating with a coarse material collecting bag (8); a second screening mechanism comprising a fluidized bed (3), a blower (4), a cyclone (5) and an ultrasonic swing screen (6), the inlet of the fluidized bed (3) communicating with the outlet of the upper part of the first screening mechanism, the first qualified product outlet of the lower part of the fluidized bed (3) communicating with a qualified product collecting bag (9); the outlet of the blower (4) communicating with the inner cavity of the fluidized bed (3) through the inner bottom wall of the fluidized bed (3) to blow air into the fluidized bed (3) to make the material flow in layers; the inlet of the cyclone (5) communicating with the air outlet of the upper part of the fluidized bed (3); the inlet of the ultrasonic swing screen (6) communicating with the outlet of the bottom of the cyclone (5), the second qualified product outlet of the lower part of the ultrasonic swing screen (6) communicating with the qualified product collecting bag (9), and the fine material outlet of the bottom of the ultrasonic swing screen (6) communicating with a first fine material collecting bag (10); an exhaust fan (7) having its inlet communicating with the air outlet of the upper part of the cyclone (5) and the air outlet of the upper part of the ultrasonic swing screen (6).
2. A screening device for fine control of catalyst particle size according to claim 1, characterized in that The first screening mechanism (2) is an air flow screen.
3. The screening device for fine control of catalyst particle size according to claim 1, wherein The screening particle size of the first screening mechanism (2) is 1-150 μm.
4. The screening apparatus for fine control of catalyst particle size according to claim 1, wherein The screening particle size of the fluidized bed (3) is 44-150 μm.
5. The screening apparatus for fine control of catalyst particle size according to claim 1, wherein The screening particle size of the cyclone (5) is 22-150 μm.
6. The screening apparatus for fine control of catalyst particle size according to claim 1, wherein The screening particle size of the ultrasonic swing screen (6) is 44-150 μm.
7. A screening device for fine control of catalyst particle size according to any one of claims 1 to 6, characterized in that A bag filter (11) is further provided, which is installed at the air inlet of the exhaust fan (7), has its air inlet communicating with the air outlets of the cyclone (5) and the ultrasonic swing screen (6), and has its outlet communicating with a second fine material collecting bag (12).
8. A screening apparatus for fine control of catalyst particle size according to claim 7, wherein The screening particle size of the bag filter (11) is 1-22 μm.
9. A screening device for fine control of catalyst particle size according to claim 7, wherein Rotary discharge valves are installed at the outlet of the bottom of the hopper (1), the first qualified product outlet, the outlet of the bottom of the cyclone (5), the second qualified product outlet and the outlet of the bottom of the bag filter (11).