Circulating fluidized bed type airflow crushing system

Abstract

The utility model discloses a circulating fluidized bed type airflow pulverization system, which comprises an air compressor, an airflow pulverization device, a first cyclone separator, a catcher and an induced draft fan connected with an air outlet of the first cyclone separator which are sequentially connected in series, and the discharge hole of the drying machine is used for feeding materials to the airflow crushing device through a spiral feeding pipe. According to the circulating fluidized bed type airflow crushing system disclosed by the utility model, the to-be-crushed materials are dried in advance through the drying machine, so that the condition that the materials are agglomerated when being crushed due to overhigh humidity is avoided; the atomizing nozzle is arranged in the crushing cavity of the airflow crushing device, a surfactant solution can be fully atomized, and the stirring effect of a material fluidized bed in the crushing cavity is utilized, so that a material and a surfactant are fully contacted and subjected to a coating reaction, the crushing and modification processes of the material are simultaneously completed, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of airflow pulverization, in particular to a circulating fluidized bed type airflow pulverization system. Background Art

[0002] Airflow milling is a systematic project, which should have a reasonable process flow. The airflow mill itself cannot work alone, and must be equipped with corresponding auxiliary machines and connected with corresponding pipes, valves and other parts to form a milling system. Usually, the airflow milling system consists of the gas source part, the feeding part, the main machine part and the product collection part. It mainly mixes the pressurized gas provided by the gas source and the solid particles provided by the feeding part into a gas-solid two-phase flow in the mill, and then the gas-solid separation is carried out by the capture system behind the mill. The solid micro powder is collected and packaged as a product, and the tail gas is discharged into the atmosphere.

[0003] In the existing air flow pulverizing system, only fluidized bed air flow pulverizer is used to pulverize materials. Especially in the mechanical equipment for preparing ultrafine powders, air flow pulverizer is generally welcomed in the industry for its advantages of low energy consumption, low wear, compact structure, easy disassembly and cleaning, high product purity, narrow particle size distribution, etc., and is favored by the majority of users. However, the existing materials contain trace amounts of water, which will cause material agglomeration during pulverization. The agglomeration problem is more serious for ultrafine materials. At present, post-treatment is generally used, that is, surfactants are further mixed into the materials after pulverization, and the ultrafine powders are surface modified under certain temperature and stirring conditions to achieve the purpose of de-agglomeration. The process is complicated and the pulverization efficiency is low. Summary of the invention

[0004] In view of this, the utility model provides a circulating fluidized bed type air flow pulverizing system, which has

[0005] The utility model solves the above problems through the following technical means:

[0006] The circulating fluidized bed type air flow pulverizing system of the utility model comprises an air compressor, an air flow pulverizing device, a first cyclone separator, a collector, and an induced draft fan connected to the exhaust port of the first cyclone separator in series, the front end of the feed port of the air flow pulverizing device is also connected in series with a dryer, and the discharge port of the dryer feeds the air flow pulverizing device through a spiral feeding pipe;

[0007] The air flow pulverizing device includes a pulverizing chamber, a classifying wheel arranged at the upper part of the pulverizing chamber, a plurality of supersonic nozzles arranged at the bottom of the pulverizing chamber, an atomizing nozzle arranged in the middle part of the pulverizing chamber and connected to the air compressor, and a second cyclone separator arranged inside the pulverizing chamber and located at the upper end of the classifying wheel, wherein the feed port and the discharge port of the second cyclone separator are both communicated with the pulverizing chamber, the exhaust port of the second cyclone separator is connected in parallel to the induced draft fan, and the second cyclone separator and the first cyclone separator are connected to the induced draft fan via an L-shaped three-way valve.

[0008] Preferably, the plurality of supersonic nozzles are distributed in a ring in a horizontal plane and the nozzles are arranged toward the bottom center of the pulverizing chamber.

[0009] As a further improvement of the above technical solution, a heater is connected in series between the air compressor and the air flow crushing device. The heater heats the incoming air through a stainless steel electric heating tube or a resistance wire. An impact-resistant temperature probe is installed at the outlet of the heater to detect the gas temperature at the outlet of the heater.

[0010] As a further improvement of the above technical solution, a movable bottom cover for opening or closing the crushing chamber is also provided at the bottom of the crushing chamber.

[0011] Preferably, the outlet end of the heater is connected to the supersonic nozzle via a stainless steel pipe or a metal hose, and an air intake pressure gauge is installed on the stainless steel pipe or the metal hose.

[0012] Preferably, the atomizing nozzle is a two-fluid fine atomizing nozzle, which includes a liquid inlet, an air inlet and a flow regulating valve.

[0013] Preferably, a guide block biased toward one side of the classifying wheel is provided at the lower end of the discharge port of the second cyclone separator.

[0014] Preferably, the guide block is an inclined plate or an arc-shaped plate structure.

[0015] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0016] The circulating fluidized bed airflow pulverizing system of the utility model dries the material to be pulverized in advance through the front-placed dryer, thereby avoiding the situation where the material agglomerates during pulverization due to excessive humidity;

[0017] An atomizing nozzle is arranged in the pulverizing chamber of the airflow pulverizing device, which can fully atomize the surfactant solution, and utilizes the stirring effect of the material fluidized bed inside the pulverizing chamber itself, so that the material and the surfactant are fully in contact and a coating reaction occurs, thereby completing the pulverization and modification process of the material at the same time, improving production efficiency and reducing labor costs;

[0018] At the same time, the second cyclone separator is arranged in the pulverizing chamber. In the process of modifying the material in the pulverizing chamber, the ultrafine material suspended in the pulverizing chamber can be sucked in and then discharged from the lower end, and the exhaust gas is directly discharged by the induced draft fan, so as to avoid the ultrafine material being directly collected by the collector along the air flow duct, so that the surfactant can contact with the surface of the pulverized material more fully, so as to achieve the purpose of de-agglomeration and improve the pulverizing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a circulating fluidized bed type airflow pulverizing system of the utility model;

[0020] Figure 2 It is a schematic structural diagram of a dryer and an airflow pulverizing device of a circulating fluidized bed airflow pulverizing system of the utility model.

[0021] like Figure 1 , Figure 2 , air compressor-1, air flow crushing device-2, crushing chamber-21, classifying wheel-22, supersonic nozzle-23, atomizing nozzle-24, second cyclone separator-25, movable bottom cover-26, guide block-27, first cyclone separator-3, collector-4, induced draft fan-5, dryer-6, spiral feeding pipe-7, three-way valve-8, heater-9, temperature probe-10. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0024] The utility model will be described in detail below with reference to the accompanying drawings. Figure 1 to Figure 2As shown: the circulating fluidized bed type air flow pulverizing system described in this embodiment comprises an air compressor 1, an air flow pulverizing device 2, a first cyclone separator 3, a collector 4, and an induced draft fan 5 connected to the exhaust port of the first cyclone separator 3 in series, and a dryer 6 is also connected in series at the front end of the feed port of the air flow pulverizing device 2, and the discharge port of the dryer 6 feeds the air flow pulverizing device 2 through a spiral feeding pipe 7; the air flow pulverizing device 2 comprises a pulverizing chamber 21, a classifying wheel 22 arranged at the upper part of the pulverizing chamber 21, and a pulverizing wheel 23 arranged at the upper part of the pulverizing chamber 21. A plurality of supersonic nozzles 23 at the bottom of the pulverizing chamber 21, an atomizing nozzle 24 connected to the air compressor 1 and arranged in the middle of the pulverizing chamber 21, and a second cyclone separator 25 arranged inside the pulverizing chamber 21 and located at the upper end of the classifying wheel 22, the feed port and the discharge port of the second cyclone separator 25 are both connected to the pulverizing chamber 21, the exhaust port of the second cyclone separator 25 is connected in parallel to the induced draft fan 5, and the second cyclone separator 25 and the first cyclone separator 3 are connected to the induced draft fan 5 through an L-shaped three-way valve 8.

[0025] The circulating fluidized bed airflow pulverizing system described in this embodiment dries the material to be pulverized in advance through the front-mounted dryer 6, thereby avoiding the situation where the material agglomerates during pulverization due to excessive humidity; an atomizing nozzle 24 is arranged in the pulverizing chamber 21 of the airflow pulverizing device 2, which can fully atomize the surfactant solution, and utilizes the material fluidized bed stirring effect inside the pulverizing chamber 21 itself, so that the material and the surfactant are fully in contact and a coating reaction occurs, thereby completing the pulverization and modification process of the material at the same time, improving production efficiency and reducing labor costs; at the same time, the second cyclone separator 25 is arranged in the pulverizing chamber 21, and the cyclone separator 25 is arranged in the pulverizing chamber 21. 1, the ultrafine materials suspended in the pulverizing chamber 21 can be sucked in and then discharged from the lower end, and the exhaust gas can be directly discharged by the induced draft fan 5, so as to avoid the ultrafine materials being directly collected by the collector 4 along the air flow duct, so that the surfactant can contact with the surface of the pulverized material more fully, so as to achieve the purpose of de-agglomeration and improve the pulverizing effect; after the surfactant is coated on the new surface, the surface free energy of the particles is reduced, the minimum stress of pulverization fracture is reduced, the particles are easier to pulverize, and the surface modification is carried out while pulverizing. The surfactant increases the dispersibility and fluidity of the pulverized particles, inhibits the agglomeration and over-pulverization of the particles, and accelerates the pulverizing process.

[0026] When in use, pre-crushing is first performed, the three-way valve 8 is connected to the second cyclone separator 25 and the induced draft fan 5, and then the dryer 6 is turned on to dry the material poured therein, and the air compressor 1 and the induced draft fan 5 are turned on at the same time. The air compressor 1 controls the gas flow rate to be 1-2 m3 / min and the gas pressure to be 0.2-0.4 MPa. Then, the dried material is fed from the material outlet of the dryer 6 into the airflow crushing device 2 through the spiral feeding pipe 7. The freely falling material is crushed by collision through the multiple supersonic nozzles 23 at the bottom of the crushing chamber 21. During the crushing process, the airflow enters through the inlet of the second cyclone separator 25 and passes through the second cyclone separator 25. After separation by the separator 25, the powder is discharged from the bottom into the grinding chamber 21 again, and the exhaust gas is discharged through the induced draft fan 5. After grinding for 1-2 minutes, the surfactant solution is siphoned into the nozzle and atomized, so that it is sprayed near the supersonic jet convergence point formed by the supersonic nozzle 23, so that the material and the surfactant collide and modify in the grinding chamber 21 for 5-10 minutes, and then the three-way valve 8 is connected to the first cyclone separator 3 and the induced draft fan 5. After the modified powder with qualified particle size passes through the classifying wheel 22 under the action of the induced draft fan 5, it enters the first cyclone separator 3 and is collected by the collector 4 as a finished product, and the unqualified material flows back to the grinding chamber 21 to continue to collide and modify with the surfactant.

[0027] As a preferred implementation of this embodiment, the multiple supersonic nozzles 23 are distributed in a ring in a horizontal plane and the nozzles are arranged toward the bottom center of the crushing chamber 21. The jets of the multiple supersonic nozzles 23 converge at a point in the center of the crushing chamber 21 to ensure the airflow crushing effect.

[0028] As a further improvement of the above technical solution, a heater 9 is connected in series between the air compressor 1 and the air flow pulverizing device 2. The heater 9 heats the incoming air through a stainless steel electric heating tube or a resistance wire. An impact-resistant temperature probe 10 is installed at the outlet of the heater 9 to detect the gas temperature at the outlet of the heater 9. The heater 9 can heat the jet air of the supersonic nozzle 23, thereby performing hot air pulverization on the material. On the one hand, it can ensure a dry environment when the material is pulverized, and on the other hand, it also provides the necessary temperature conditions for the coating reaction between the material and the surfactant. When in use, turn on the heater 9, and when the temperature at the outlet of the heater 9 is stabilized at 80-120°C, turn on the induced draft fan 5, control the gas pressure to 0.7-0.9MPa, and stabilize the temperature at the outlet of the heater 9 at 70-110°C.

[0029] As a further improvement of the above technical solution, a movable bottom cover 26 for opening or closing the crushing chamber 21 is further provided at the bottom of the crushing chamber 21, so as to facilitate opening the crushing chamber 21 for cleaning or replacing objects.

[0030] As a preferred implementation scheme of this embodiment, the outlet end of the heater 9 is connected to the supersonic nozzle 23 through a stainless steel pipe or a metal hose, and an air intake pressure gauge is installed on the stainless steel pipe or the metal hose. The connection of the stainless steel pipe or the metal hose ensures the sealing and the pipeline's tolerance to high-pressure hot air.

[0031] As a preferred implementation of this embodiment, the atomizing nozzle 24 is a two-fluid fine atomizing nozzle 24, which includes a liquid inlet, an air inlet and a flow regulating valve. When working, the air compressor 1 provides compressed air, and uses the compressed air to atomize the surfactant solution. The atomized particles are small and uniform, and the solvent is completely evaporated.

[0032] As a preferred implementation of this embodiment, the lower end of the discharge port of the second cyclone separator 25 is provided with a guide block 27 biased towards the side of the classifying wheel 22, and the guide block 27 can guide the material flowing out of the above-mentioned discharge port so that the material can smoothly fall into the bottom of the crushing chamber 21 from one side. Specifically, the guide block 27 is an inclined plate or an arc plate structure.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A circulating fluidized bed type air flow pulverizing system, comprising an air compressor, an air flow pulverizing device, a first cyclone separator, a collector, and an induced draft fan connected to the exhaust port of the first cyclone separator in series, characterized in that: A dryer is also connected in series at the front end of the feed port of the airflow pulverizing device, and the discharge port of the dryer feeds the airflow pulverizing device through a spiral feeding pipe; The air flow pulverizing device includes a pulverizing chamber, a classifying wheel arranged at the upper part of the pulverizing chamber, a plurality of supersonic nozzles arranged at the bottom of the pulverizing chamber, an atomizing nozzle arranged in the middle part of the pulverizing chamber and connected to the air compressor, and a second cyclone separator arranged inside the pulverizing chamber and located at the upper end of the classifying wheel, wherein the feed port and the discharge port of the second cyclone separator are both communicated with the pulverizing chamber, the exhaust port of the second cyclone separator is connected in parallel to the induced draft fan, and the second cyclone separator and the first cyclone separator are connected to the induced draft fan via an L-shaped three-way valve.

2. A circulating fluidized bed airflow pulverizing system according to claim 1, characterized in that: The plurality of supersonic nozzles are distributed in a ring shape in a horizontal plane and the nozzles are arranged toward the bottom center of the pulverizing chamber.

3. The circulating fluidized bed airflow pulverizing system according to claim 1, characterized in that: A heater is connected in series between the air compressor and the air flow pulverizing device. The heater heats the incoming air through a stainless steel electric heating tube or a resistance wire. An impact-resistant temperature probe is installed at the outlet of the heater to detect the gas temperature at the outlet of the heater.

4. A circulating fluidized bed airflow pulverizing system according to claim 3, characterized in that: The outlet end of the heater is connected to the supersonic nozzle through a stainless steel pipe or a metal hose, and an air intake pressure gauge is installed on the stainless steel pipe or the metal hose.

5. The circulating fluidized bed airflow pulverizing system according to claim 1, characterized in that: The bottom of the pulverizing chamber is also provided with a movable bottom cover for opening or closing the pulverizing chamber.

6. The circulating fluidized bed airflow pulverizing system according to claim 1, characterized in that: The atomizing nozzle is a two-fluid fine atomizing nozzle, which comprises a liquid inlet, an air inlet and a flow regulating valve.

7. The circulating fluidized bed airflow pulverizing system according to claim 1, characterized in that: A guide block is disposed at the lower end of the discharge port of the second cyclone separator, which is biased toward one side of the classifying wheel.

8. A circulating fluidized bed airflow pulverizing system according to claim 7, characterized in that: The guide block is an inclined plate or an arc-shaped plate structure.

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