An air jet milling system

Abstract

This utility model discloses an airflow pulverizing system, comprising: an airflow pulverizer having an airflow inlet, a material inlet, and a discharge outlet; an air compressor having a cold air inlet and a hot air outlet, the hot air outlet being connected to the airflow inlet via a pipeline; a material collector having a feed inlet, a material outlet, and an airflow outlet, the discharge outlet and the feed inlet being interconnected via a pipeline; and a cooler having an air inlet and an air outlet, the air inlet being interconnected with the airflow outlet via a pipeline, and the air outlet being interconnected with the cold air inlet via a pipeline. This utility model recovers the compression heat energy generated by the air compressor, providing kinetic energy for material pulverization, saving the energy consumption required for cooling, thereby reducing the cost required for airflow pulverization of materials.

Description

Technical Field

[0001] This utility model relates to the field of material pulverization technology, and in particular to an airflow pulverization system. Background Technology

[0002] In the depolymerization process after sintering of lithium iron phosphate, air jet mills or similar equipment are typically used for air jet milling. The airflow supplied to the air jet mill is first cooled in three stages by a compressor to become a low-temperature, high-pressure gas before entering the mill for pulverization. This three-stage cooling process requires a large amount of circulating cooling water at 32 to 42 degrees Celsius, and the compressor also has high power consumption, resulting in high energy consumption and operating and maintenance costs. Therefore, there is an urgent need for an air jet milling system with lower energy consumption. Utility Model Content

[0003] The purpose of this invention is to provide an airflow pulverizing system to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is:

[0005] An airflow pulverizing system includes: an airflow pulverizer having an airflow inlet, a material inlet, and a discharge outlet; an air compressor having a cold air inlet and a hot air outlet, the hot air outlet being connected to the airflow inlet via a pipeline; a material collector having a feed inlet, a material outlet, and an airflow outlet, the discharge outlet and the feed inlet being interconnected via a pipeline; and a cooler having an air inlet and an air outlet, the air inlet being interconnected with the airflow outlet via a pipeline, and the air outlet being interconnected with the cold air inlet via a pipeline.

[0006] This technical solution has at least the following beneficial effects: The material to be crushed is input into the air jet mill through the material inlet, while the air compressor generates high-temperature gas, which is input into the air jet inlet through the hot gas outlet via a pipeline, providing kinetic energy for the crushing of the material. After the material is crushed in the air jet mill, it is output from the discharge port along with the air jet, and then sent into the material collector through the feed port via a pipeline. The material collector separates the material from the air jet. At this time, the crushed material is discharged from the material outlet, while the air jet is input into the air inlet through the air jet outlet via a pipeline. The air jet is cooled in the cooler, and then input into the cold air inlet through the outlet via a pipeline, where the air jet is recompressed and circulated again to provide kinetic energy for the air jet mill. In this way, the compression heat energy generated by the air compressor is recovered to provide kinetic energy for the crushing of the material, saving the energy consumption required for cooling, thereby reducing the cost required for air jet milling of materials.

[0007] As a further improvement to the above technical solution, the air compressor assembly includes a primary compressor and a secondary compressor connected to each other. The cold air inlet is located on the primary compressor, the secondary compressor is configured to further compress the compressed gas generated by the primary compressor, and the hot air outlet is located on the secondary compressor.

[0008] As a further improvement to the above technical solution, the present invention also includes a cooling water assembly, which is connected to the primary compressor via a pipeline and can cool the gas compressed by the primary compressor.

[0009] As a further improvement to the above technical solution, the cooler is connected to a cooling water assembly via a pipeline, and the cooling water assembly can input cooling water into the cooler and cool the airflow input into the cooler.

[0010] As a further improvement to the above technical solution, the present invention also includes a first filter disposed on the connecting pipe between the airflow outlet and the air inlet.

[0011] As a further improvement to the above technical solution, the present invention also includes a third compressor, which is connected to the first filter via a pipeline, and the third compressor can supply gas to the first filter.

[0012] As a further improvement to the above technical solution, a refrigerated dryer, a hot dryer, and a second filter are sequentially installed on the pipeline from the third compressor to the first filter.

[0013] As a further improvement to the above technical solution, the present invention also includes a third filter disposed on the connecting pipe between the air outlet and the cold air inlet.

[0014] As a further improvement to the above technical solution, the present invention also includes a feeding hopper connected to the material inlet.

[0015] As a further improvement to the above technical solution, the present invention also includes a material silo connected to the material outlet.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] In the attached diagram: 110-Airflow pulverizer, 120-Air compressor assembly, 121-First stage compressor, 122-Second stage compressor, 130-Material collector, 140-Cooler, 150-Cooling water assembly, 160-First filter, 170-Third filter, 180-Feeding hopper, 190-Material hopper, 210-Third compressor, 220-Refrigerated dryer, 230-Hot dryer, 240-Second filter. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figure 1An airflow pulverizing system, comprising:

[0025] The air jet mill 110 is equipped with an air inlet, a material inlet and a discharge outlet. The grinding power in the air jet mill 110 mainly comes from the compressed air entering from the air inlet. In practical applications, a Laval nozzle is installed at the air inlet to supply high-pressure gas.

[0026] The air compressor assembly 120 is provided with a cold air inlet and a hot air outlet. The hot air outlet is connected to the airflow inlet through a pipeline. The air compressor assembly 120 can return the airflow in the entire system from the cold air inlet, compress it, and discharge the gas from the hot air outlet.

[0027] The material collector 130 is provided with a feed inlet, a material outlet and an airflow outlet. The discharge inlet and the feed inlet are connected to each other through pipelines. The material collector 130 is mainly used to separate the crushed material from the airflow, so that the material is collected by sedimentation.

[0028] The cooler 140 is provided with an air inlet and an air outlet. The air inlet is connected to the airflow outlet through a pipeline, and the air outlet is connected to the cold air inlet through a pipeline. The cooler 140 mainly cools the return air in the entire system to a low temperature so that the return air can be recompressed by the subsequent air compressor assembly 120.

[0029] As described above, the material to be pulverized is input into the air jet mill 110 through the material inlet. High-temperature gas is generated in the air compressor assembly 120 and input into the air jet inlet through the hot gas outlet, providing kinetic energy for pulverizing the material. After the material is pulverized in the air jet mill 110, it is output from the discharge port along with the air jet and sent into the material collector 130 through the feed port through the pipeline. The material collector 130 separates the material from the air jet. At this time, the pulverized material is discharged from the material outlet, while the air jet is input into the air inlet through the pipeline from the air jet outlet. The air jet is cooled in the cooler 140 and then input into the cold air inlet through the pipeline from the air outlet, where the air jet is recompressed and circulated again to provide kinetic energy for the air jet mill 110. In this way, the compression heat energy generated by the air compressor assembly 120 is recovered to provide kinetic energy for pulverizing the material, saving the energy consumption required for cooling and thus reducing the cost required for air jet pulverization of materials.

[0030] In a specific embodiment of the air compressor assembly 120, the air compressor assembly 120 includes a primary compressor 121 and a secondary compressor 122 connected to each other. A cold air inlet is located on the primary compressor 121, and the secondary compressor 122 is configured to further compress the compressed gas produced by the primary compressor 121. A hot air outlet is located on the secondary compressor 122. In the air compressor assembly 120, the return air cooled by the cooler 140 is compressed once by the cold air inlet of the primary compressor 121, and then input into the secondary compressor 122 for secondary compression, thereby obtaining high-temperature gas, which is then output from the hot air outlet of the secondary compressor 122.

[0031] To reduce the energy consumption required for multi-stage compression within the air compressor assembly 120, this invention also includes a cooling water assembly 150. The cooling water assembly 150 is connected to the primary compressor 121 via pipelines and can cool the gas compressed by the primary compressor 121. When the primary compressor 121 produces compressed gas, the cooling water cools the compressed gas, thereby reducing the air temperature after primary compression, reducing the power consumption of the next stage of compression, and facilitating the secondary compressor 122 to produce high-temperature gas after secondary compression.

[0032] The cooling water assembly 150 is used to provide cooling water. It includes a cooling water container, a pump, an evaporator or a semiconductor refrigeration chip, etc. The cooling water in the cooling water container is cooled by the refrigeration source and then pumped to the first-stage compressor 121.

[0033] The cooler 140 itself can have a cooling source, such as an evaporator or a thermoelectric cooler. To reduce equipment costs, cooling can be provided from the cooling water assembly 150. Specifically, the cooler 140 is connected to the cooling water assembly 150 via pipes, allowing the cooling water assembly 150 to supply cooling water to the cooler 140 and cool the incoming airflow. In practical applications, the cooler 140 has independent water and airflow channels, enabling heat exchange between the cooling water and the airflow. This allows the cooling water to cool the airflow as it enters the cooler 140. The cooler 140 primarily cools the gas to below 25 degrees Celsius, mainly through heat exchange with the return air using circulating cooling water. This facilitates air compression by the downstream air compressor assembly 120, as high-temperature gas has low pressure and volume, which is detrimental to exhaust gas production.

[0034] The first filter 160 primarily provides filtration for the return air. Specifically, this invention also includes a first filter 160 disposed on the connecting pipe between the airflow outlet and the air inlet. The first filter mainly employs a bag filter to filter particulate matter from the circulating gas within the system, thereby achieving the required clean air quality.

[0035] In practical applications, exhaust gas may be discharged during the operation of the air compressor assembly 120. Therefore, it is necessary to replenish the return air circulation of the system. Thus, this invention also includes a third compressor 210, which is connected to the first filter 160 via a pipeline. The third compressor 210 can supply gas to the first filter 160. Return air discharged from the material collector 130 enters the first filter 160. If the air volume at this time does not reach the set required air volume, the third compressor 210 compresses the outside air and replenishes the first filter 160 with gas, which is then input into the air inlet. Once the required air volume is reached, the replenishment of the first filter 160 by the third compressor 210 is reduced.

[0036] To ensure that dry gas is supplied to the first filter 160, in this embodiment, a refrigerated dryer 220, a hot dryer 230, and a second filter 240 are sequentially installed on the pipeline from the third compressor 210 to the first filter 160. The gas discharged from the third compressor 210 is high-pressure gas with a certain temperature. At this time, the gas passes through the refrigerated dryer 220, where it is rapidly cooled to the dew point temperature, causing the moisture and mineral oil in the compressed air to condense and be discharged. Then, the compressed air is supplied to the hot dryer 230 to evaporate the hot air in the compressed air. Finally, the second filter 240 filters the hot-dried air to remove impurities, thereby ensuring the dryness and cleanliness of the supplied air.

[0037] The hot air dryer 230 may include an electric heating element, a blower, a dual-tower adsorption structure (tower A and tower B), and a molecular sieve. In the hot air dryer 230, the electric heating element heats the air supplied by the blower to 110 degrees Celsius. The heated air is then sent to tower A within the dual-tower adsorption structure. Upon entering tower A, the hot air dehumidifies the molecular sieve until all moisture is removed. Then, compressed air from the refrigerated air dryer 220 is sent to tower A for further heating and dehumidification through the pipe valves of the hot air dryer 230. During this process, the refrigerated air dryer 220 acts as a pretreatment device, connected in series with the hot air dryer 230 to initially remove moisture from the compressed air, reducing the processing load of the hot air dryer 230 and improving overall drying efficiency. As the compressed air passes through the 110-degree Celsius molecular sieve, the water in the air is evaporated and absorbed into the molecular sieve. While tower A is dehumidifying, the valves send the hot air from the blower to tower B for further heating and dehumidification. The AB towers sequentially perform molecular sieve dehumidification and compressed air dehumidification. Based on the requirements of the gas-using process, the dew point temperature of the compressed air after passing through the 230 heat dryer can reach -40 degrees Celsius.

[0038] When the compressed air from the hot dryer 230 passes through the second filter 240, a three-stage filtration system can be set up in the second filter 240 with filtration accuracies of 3um, 1um, and 0.01um respectively. After three-stage filtration, the particle size of particulate matter in the gas can be reduced to below 0.01um, which helps to ensure the cleanliness of the compressed air.

[0039] To further ensure the cleanliness of the gas supplied to the air compressor assembly 120, this invention also includes a third filter 170 disposed on the connecting pipe between the air outlet and the cold air inlet. The third filter 170 mainly filters the return air circulating within the system, ensuring that the content of impurities and particulate matter in the return air before entering the air compressor unit for compression is reduced.

[0040] This invention also includes a feed hopper 180 connected to the material inlet. The feed hopper 180 is used to buffer the material coming from upstream and to supply the air jet mill 110.

[0041] This utility model also includes a material hopper 190 connected to the material outlet. The material hopper 190 is mainly used to store the crushed material collected by the material collector 130 for the next processing step.

[0042] Therefore, the entire airflow pulverizing system reduces the amount of gas used and the investment in post-pulverization processing equipment (such as the refrigerated dryer 220 and the hot dryer 230), thus saving energy and correspondingly reducing utilities. Furthermore, reducing the amount of cooling water used in the compressor also reduces the investment in cooling water equipment, saving operating energy and lowering the compressor's purchase cost. The three-stage compression and cooling system is reduced to two stages, with only the first stage requiring cooling, resulting in a reduction in overall equipment procurement costs and a nearly 20% reduction in operating power consumption. During the pulverizing process, the high-temperature gas is supplied faster than the low-temperature, high-pressure gas, saving on pulverizing gas volume.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An airflow pulverizing system, characterized in that: include: An airflow pulverizer (110) is provided with an airflow inlet, a material inlet, and a discharge outlet; The air compressor assembly (120) is provided with a cold air inlet and a hot air outlet, wherein the hot air outlet is connected to the air inlet via a pipeline; The material collector (130) is provided with a feed inlet, a material outlet and an airflow outlet, and the feed inlet and the material outlet are connected to each other through a pipeline; The cooler (140) is provided with an air inlet and an air outlet. The air inlet is connected to the airflow outlet through a pipe, and the air outlet is connected to the cold air inlet through a pipe.

2. The airflow pulverizing system according to claim 1, characterized in that: The air compressor assembly (120) includes a primary compressor (121) and a secondary compressor (122) connected to each other. The cold air inlet is located on the primary compressor (121), the secondary compressor (122) is configured to further compress the compressed gas generated by the primary compressor (121), and the hot air outlet is located on the secondary compressor (122).

3. The airflow pulverizing system according to claim 2, characterized in that: It also includes a cooling water assembly (150), which is connected to the primary compressor (121) via a pipeline. The cooling water assembly (150) can cool the gas compressed by the primary compressor (121).

4. The airflow pulverizing system according to claim 2, characterized in that: The cooler (140) is connected to the cooling water assembly (150) via a pipe. The cooling water assembly (150) can input cooling water into the cooler (140) and cool the airflow input into the cooler (140).

5. The airflow pulverizing system according to claim 1, characterized in that: It also includes a first filter (160) disposed on the connecting pipe between the air outlet and the air inlet.

6. The airflow pulverizing system according to claim 5, characterized in that: It also includes a third compressor (210), which is connected to the first filter (160) via a pipeline, and the third compressor (210) can supply gas to the first filter (160).

7. The airflow pulverizing system according to claim 6, characterized in that: A refrigerated dryer (220), a hot dryer (230), and a second filter (240) are sequentially installed on the pipeline from the third compressor (210) to the first filter (160).

8. The airflow pulverizing system according to claim 1, characterized in that: It also includes a third filter (170) installed on the connecting pipe between the air outlet and the cold air inlet.

9. The airflow pulverizing system according to claim 1, characterized in that: It also includes a discharge hopper (180) connected to the material inlet.

10. The airflow pulverizing system according to claim 1, characterized in that: It also includes a material silo (190) connected to the material outlet.

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