Coal drying device based on the principle of freeze drying in a hopper scale

Abstract

The present application relates to the technical field of dry coal, and particularly relates to a coal drying device based on the principle of freeze drying in a hopper scale, which comprises a coal weighing assembly, a conveying part, a transfer part and a rotating part, the transfer part and the rotating part are arranged on the conveying part; a temperature adjusting assembly, a cooling part and a pressure reducing part, the cooling part is arranged on the transfer part, and the pressure reducing part is arranged on the transfer part; and a drying assembly, a coal storage part, a heating part and a condensing part, the coal storage part is arranged on the transfer part, the heating part is arranged on the transfer part, and the transfer part is arranged on the transfer part, through mutual cooperation among the coal weighing assembly, the temperature adjusting assembly and the drying assembly, a complete drying device is formed, the improved process can completely solve the freezing problem of coal in winter, and will not cause influence on the coal itself, and through the three-phase balance characteristics of water in a vacuum and low-temperature environment, the drying of coal is realized.

Description

Technical Field

[0001] This invention relates to the field of coal drying technology, and in particular to a coal drying device in a bucket based on the principle of freeze drying. Background Technology

[0002] During actual coal testing, large-scale freezing often occurs in winter due to the high moisture content of the coal. This situation is even more serious during actual coal testing. The bucket scale for actual coal testing is a closed environment, making it difficult to enter. When freezing occurs, the only way to loosen the coal is through repeated vibration and adjustment of the discharge gate, which is only a temporary solution. This may have some effect when the coal is slightly frozen, but when too much coal is put in (more than 20 tons) and stays in the bucket for a long time, it may lead to large-scale freezing. In this case, it is difficult to release the coal by vibration or adjustment of the discharge gate. If the operation is too frequent, it is easy to overheat the vibration device and the discharge gate, and even cause a large amount of coal to rush into the conveyor belt below in a short period of time, damaging the equipment. Therefore, this problem is extremely necessary to solve. Summary of the Invention

[0003] In view of the above-mentioned problem that the high moisture content of coal during winter coal verification often leads to large-scale freezing and makes the coal difficult to release, this invention is proposed.

[0004] Therefore, the purpose of this invention is to provide a coal drying device in a bucket weigher based on the principle of freeze drying.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including,

[0006] The coal assembly includes a transport component, a transfer component, and a slewing component, wherein the transfer component and the slewing component are disposed on the transport component;

[0007] A temperature control assembly includes a cooling component and a vacuum component, wherein the cooling component is disposed on the transfer component, and the vacuum component is disposed on the transfer component; and,

[0008] The drying assembly includes a coal storage component, a heating component, and a condensing component. The coal storage component is disposed on the transfer component, the heating component is disposed on the transfer component, and the transfer component is disposed on the transfer component.

[0009] As a preferred embodiment of the coal drying device in a bucket scale based on the freeze-drying principle described in this invention, the transport component includes a coal pipeline for transporting coal, a belt scale fixedly connected to the coal pipeline, and a first belt mounted on the belt scale.

[0010] As a preferred embodiment of the bucket coal drying device based on the freeze-drying principle described in this invention, the transfer component includes a transfer pipe and a coal plow installed on the coal pipe, and a coal storage bin installed on the transfer pipe.

[0011] As a preferred embodiment of the bucket scale coal drying device based on the freeze-drying principle described in this invention, the rotating component includes a bucket wheel excavator installed on the coal storage bin, which directly transmits the coal back to the coal pipeline.

[0012] As a preferred embodiment of the coal drying device in a bucket scale based on the principle of freeze drying described in this invention, the cooling component includes a liquid nitrogen conveying pipe disposed in the coal storage bin, a liquid nitrogen electric door disposed on the liquid nitrogen conveying pipe, and a liquid nitrogen tank fixedly connected to the liquid nitrogen conveying pipe.

[0013] As a preferred embodiment of the coal drying device in a bucket based on the principle of freeze drying described in this invention, the vacuum component includes an air suction pipe disposed in the coal storage bin, a vacuum electric door disposed on the air suction pipe, and a vacuum pump fixedly connected to the air suction pipe.

[0014] As a preferred embodiment of the coal drying device in a bucket based on the principle of freeze drying described in this invention, the vacuum pump is turned on, which reduces the pressure in the coal storage bin to between 20 Pa and 30 Pa, and the coal storage bin is evacuated to form a vacuum.

[0015] As a preferred embodiment of the coal drying device in a bucket based on the principle of freeze drying described in this invention, the coal storage component includes a coal conveying pipe installed in the coal storage bin and an electric coal conveying gate installed on the coal conveying pipe.

[0016] As a preferred embodiment of the coal drying device in a bucket based on the principle of freeze drying described in this invention, the heating element includes heating wires disposed on the coal storage bin, and the heating wires are uniformly arranged in a ring around the coal storage bin.

[0017] As a preferred embodiment of the coal drying device in a bucket scale based on the principle of freeze drying described in this invention, the condensing component includes a condensing pipe disposed on the coal storage bin, a condensing electric door disposed on the condensing pipe, and a condensing box fixedly connected to the condensing pipe.

[0018] The beneficial effects of this invention are as follows: By cooperating with the coal weighing assembly, temperature regulating assembly, and drying assembly to form a complete drying device, this improved process can completely solve the problem of coal freezing in winter without affecting the coal itself. This improved process innovatively uses "freeze-drying" technology from the food and other fields, and utilizes the three-phase equilibrium characteristics of water under vacuum and low temperature conditions to achieve coal drying. This contributes to ensuring equipment operation, reducing calibration pressure, improving work efficiency, and reducing equipment burden. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a bucket scale coal drying device based on the principle of freeze drying according to the present invention.

[0021] Figure 2 This is a schematic diagram of the coal weighing component structure of a bucket weigher coal drying device based on the principle of freeze drying according to the present invention.

[0022] Figure 3 This is a partial cross-sectional schematic diagram of a coal drying device in a bucket weigher based on the principle of freeze drying according to the present invention.

[0023] Figure 4 This is a three-phase diagram of water in a bucket weigher coal drying device based on the principle of freeze drying according to the present invention. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0028] Example 1

[0029] Reference Figure 1 - Figure 3 This is the first embodiment of the present invention, which provides a coal drying device in a bucket scale based on the principle of freeze drying. The device includes a coal weighing assembly 100, which includes a transport component 101, a transfer component 102, and a rotating component 103. The transfer component 102 and the rotating component 103 are disposed on the transport component 101. Through the interaction and cooperation between the transport component 101, the transfer component 102, and the rotating component 103, the actual coal verification of the belt scale 101b can be realized.

[0030] Specifically, the transport component 101 includes a coal pipeline 101a for transporting coal, with several belts inside the coal pipeline 101a for transferring coal. The coal pipeline 101a is a semi-enclosed space, preventing the coal from being exposed and increasing the water content inside the coal. A belt scale 101b is fixedly connected to the coal pipeline 101a and is fixed to one side of the coal pipeline 101a to continuously weigh the coal. A first belt 101c is installed on the belt scale 101b. The first belt 101c is located inside the coal pipeline 101a and, during operation, causes the belt scale 101b to weigh the coal on it.

[0031] Furthermore, the transfer component 102 includes a transfer pipe 102a and a coal plow 102b disposed on the coal pipe 101a. The transfer pipe 102a is fixedly connected below the coal pipe 101a, allowing coal on the first belt conveyor 101c to fall onto the transfer pipe 102a for subsequent operations. The coal plow 102b is fixedly connected to the coal pipe 101a and disposed on one side of the belt scale 101b. After the coal passes through the belt scale 101b, the coal plow 102b plows the coal into the transfer pipe. In channel 102a, a coal storage bin 102c is installed on the transfer pipeline 102a. The coal storage bin 102c is fixedly connected to the transfer pipeline 102a and is located on the lower side of the transfer pipeline 102a, so that the coal in the transfer pipeline 102a can fall into the coal storage bin 102c. The coal storage bin 102c is also called a bucket scale, which is used to store the coal falling from the transfer pipeline 102a. Coal that needs to be dried is stored in the coal storage bin 102c, and the coal storage electric door is closed after confirming that it is completely sealed.

[0032] Furthermore, the rotating component 103 includes a bucket wheel excavator 103a installed on the coal storage bin 102c. The bucket wheel excavator 103a directly transports the coal back to the coal pipeline 101a. After the coal storage bin 102c has completed the weighing and measurement, the coal is transported back to the coal pipeline 101a by the bucket wheel excavator 103a.

[0033] During operation, the actual coal verification of the belt scale 101b is roughly as follows: two belts are laid in the coal pipeline 101a of the first belt 101c. After the coal passes through the belt scale 101b, the coal plow 102b plows the coal into the lower coal storage bin 102c through the transfer pipeline 102a. After the measurement and weighing are completed, the coal is put back into the coal pipeline 101a through the bucket wheel excavator 103a. Coal that needs to be dried can be stored in the coal storage bin 102c. The coal storage electric door is closed and the seal is confirmed to be completely sealed.

[0034] Example 2

[0035] Reference Figure 1 - Figure 3 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the device includes a temperature control component 200, which includes a cooling component 201 and a vacuum component 202. The cooling component 201 is disposed on the transfer component 102, and the vacuum component 202 is disposed on the transfer component 102. Through the cooling component 201 and the vacuum component 202, coal containing a large amount of moisture can be pre-cooled and frozen into a solid. Then, under vacuum conditions, water vapor is directly sublimated from the solid, while the substance itself remains in the frozen ice frame. This ensures that the dried product does not lose its original solid skeleton structure and maintains the original shape of the material.

[0036] Specifically, the cooling component 201 includes a liquid nitrogen delivery pipe 201a installed in the coal storage silo 102c, a liquid nitrogen electric door 201b installed on the liquid nitrogen delivery pipe 201a, and a liquid nitrogen tank 201c fixedly connected to the liquid nitrogen delivery pipe 201a. The liquid nitrogen in the liquid nitrogen tank 201c can be controlled by the liquid nitrogen electric door 201b on the liquid nitrogen delivery pipe 201a. When opened, the liquid nitrogen can flow into the coal storage silo 102c to rapidly cool the coal, causing the moisture between the coal particles to quickly turn into ice crystals. The purpose of rapid freezing is to turn the water content in the coal into small ice crystals in a short time. Generally speaking, the faster the cooling rate and the lower the supercooling temperature, the more crystal nuclei are formed. The crystals are frozen before they have time to grow, resulting in more and finer crystal grains. Conversely, the fewer the crystal grains, the larger the crystal grains. Fine ice grains are more conducive to the sublimation process.

[0037] Furthermore, the vacuum component 202 includes an air intake pipe 202a disposed on the coal storage silo 102c. The air intake pipe 202a is fixedly connected to the left or right side of the coal storage silo 102c, so as not to affect the entry of coal into the coal storage silo 102c. A vacuum electric door 202b is disposed on the air intake pipe 202a, and a vacuum pump 202c is fixedly connected to the air intake pipe 202a. The vacuum pump 202c is fixedly connected to one side of the coal storage silo 102c and is installed on the same side as the liquid nitrogen tank 201c. This facilitates space saving and simultaneous maintenance during long-term use. By opening the vacuum electric door 202b, the air intake pipe 202a fixedly connected to one side of the coal storage silo 102c can be controlled to perform vacuum treatment inside the coal storage silo 102c via the vacuum pump 202c.

[0038] Turning on the vacuum pump 202c will reduce the pressure in the coal storage silo 102c to between 20pa and 30pa, which will facilitate the suction of air into the coal storage silo 102c to form a vacuum.

[0039] The remaining structure is the same as that in the embodiment.

[0040] Operating procedure: Open the liquid nitrogen electric door 201b to allow liquid nitrogen tank 201c to enter the coal storage silo 102c through the liquid nitrogen delivery pipe 201a, rapidly cooling the coal and causing the moisture between the coal particles to quickly turn into ice crystals. After a period of time, once the ice crystals have formed, the vacuum electric door 202b can be opened to start the vacuum pump 202c, which reduces the pressure in the coal storage silo 102c to between 1 Pa and 10 Pa through the suction pipe 202a.

[0041] Example 3

[0042] Reference Figure 1 - Figure 4 This is the third embodiment of the present invention. This embodiment differs from the second embodiment in that: the device includes a drying component 300, including a coal storage component 301, a heating component 302, and a condensing component 303. The coal storage component 301 is disposed on the transfer component 102, the heating component 302 is disposed on the transfer component 102, and the transfer component 102 is disposed on the transfer component 102. Through the interaction between the coal storage component 301, the heating component 302, and the condensing component 303, the improved process can completely solve the problem of coal freezing in winter without affecting the coal itself.

[0043] Specifically, the coal storage component 301 includes a coal conveying pipe 301a installed in the coal storage silo 102c. The coal conveying pipe 301a is fixedly connected to the upper side of the coal storage silo 102c. A coal conveying electric gate 301b is installed on the coal conveying pipe 301a. The coal conveying electric gate 301b controls whether the coal in the coal storage pipe continues to fall into the coal storage silo 102c.

[0044] Furthermore, the heating element 302 includes a heating wire 302a disposed on the coal storage bin 102c. The heating wire 302a is uniformly arranged in a ring around the coal storage bin 102c. When the heating wire 302a is turned on, the ice crystals formed by the coal are rapidly sublimated into water vapor by the liquid nitrogen pump, while the coal itself remains in the frozen ice frame. This ensures that the dried product does not lose its original solid skeleton structure and maintains the original shape of the coal.

[0045] Furthermore, the condenser 303 includes a condenser pipe 303a installed on the coal storage silo 102c. The condenser pipe 303a is fixedly connected to one side of the coal storage silo 102c and is opposite to the vacuum pump 202c, which also serves as a separation function. A condenser electric door 303b is installed on the condenser pipe 303a. The condenser electric door 303b has a filter screen inside to filter impurities that may be present in the water vapor. A condenser box 303c is fixedly connected to the condenser pipe 303a. After passing through the heating wire 302a, the ice crystals sublimate into water vapor and can enter the condenser box 303c through the condenser pipe 303a to complete the drying process of the coal.

[0046] Among them, according to the appendix Figure 4 As shown in the equilibrium diagram of water (H2O), substances exist in three states: solid, liquid, and vapor. The state of a substance is related to its temperature and pressure. The three curves OA, OB, and OC in the diagram represent the relationship between pressure and temperature when ice and water, water and water vapor, and ice and water vapor coexist as two phases, respectively. These curves are called the melting line, boiling line, and sublimation line. These three curves divide the graph into three regions, called the solid phase region, liquid phase region, and gas phase region. The intersection point O of the three curves represents the state in which the solid, liquid, and vapor phases coexist, called the triple point. Its temperature is 0.01℃ and its pressure is 610Pa. Below the triple point, there is no liquid phase. If the pressure on the ice surface is kept below 610Pa and the ice is heated, the ice will directly turn into the vapor phase without passing through the liquid phase. This process is called sublimation.

[0047] The remaining structure is the same as that in the embodiment.

[0048] Operating steps: Turn on heating wire 302a to rapidly sublimate ice crystals into water vapor. After drying is complete, open the condenser electric door 303b to guide the water vapor through the condensation pipe and collect it in the condensation tank, thus achieving drying. The product absorbs heat during sublimation drying; approximately 670 calories of heat are required for one gram of ice to completely turn into steam. Therefore, the product must be heated during the sublimation stage. This improved process innovatively utilizes "freeze-drying" technology from the food industry and other fields. By leveraging the three-phase equilibrium characteristics of water under vacuum and low-temperature conditions, it achieves coal drying, contributing to ensuring equipment operation, reducing calibration pressure, improving work efficiency, and alleviating equipment burden.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A coal drying device for a bucket scale based on the principle of freeze drying, characterized in that: include, The coal assembly (100) includes a transport component (101), a transfer component (102), and a rotating component (103), wherein the transfer component (102) and the rotating component (103) are disposed on the transport component (101); A temperature control assembly (200) includes a cooling element (201) and a vacuum element (202), wherein the cooling element (201) is disposed on the transfer element (102), and the vacuum element (202) is disposed on the transfer element (102); and, The drying assembly (300) includes a coal storage component (301), a heating component (302), and a condensing component (303), wherein the coal storage component (301) is disposed on the transfer component (102), and the heating component (302) is disposed on the transfer component (102); The transport component (101) includes a coal pipeline (101a) for transporting coal, a belt scale (101b) fixedly connected to the coal pipeline (101a), and a first belt (101c) disposed on the belt scale (101b). The transfer component (102) includes a transfer pipe (102a) and a coal plow (102b) disposed on the coal pipe (101a), and a coal storage bin (102c) disposed on the transfer pipe (102a). The rotating component (103) includes a bucket wheel excavator (103a) installed on the coal storage bin (102c), which directly transmits coal back to the coal pipeline (101a). The cooling component (201) includes a liquid nitrogen delivery pipe (201a) disposed in the coal storage silo (102c), a liquid nitrogen electric door (201b) disposed on the liquid nitrogen delivery pipe (201a), and a liquid nitrogen tank (201c) fixedly connected to the liquid nitrogen delivery pipe (201a). The vacuum component (202) includes an air intake pipe (202a) disposed in the coal storage bin (102c), a vacuum electric door (202b) disposed on the air intake pipe (202a), and a vacuum pump (202c) fixedly connected to the air intake pipe (202a).

2. The coal drying device in a bucket weigher based on the freeze-drying principle according to claim 1, characterized in that: Turning on the vacuum pump (202c) will reduce the pressure in the coal storage silo (102c) to between 20pa and 30pa, and the coal storage silo (102c) will be evacuated to form a vacuum.

3. The coal drying device in a bucket weigher based on the freeze-drying principle according to claim 2, characterized in that: The coal storage unit (301) includes a coal conveying pipe (301a) installed in the coal storage bin (102c) and a coal conveying electric gate (301b) installed on the coal conveying pipe (301a).

4. The coal drying device in a bucket weigher based on the freeze-drying principle according to claim 3, characterized in that: The heating element (302) includes a heating wire (302a) disposed on the coal storage bin (102c), wherein the heating wire (302a) is uniformly arranged in a ring around the coal storage bin (102c).

5. The coal drying device in a bucket weigher based on the freeze-drying principle according to claim 4, characterized in that: The condenser (303) includes a condenser pipe (303a) disposed on the coal storage silo (102c), a condenser electric door (303b) disposed on the condenser pipe (303a), and a condenser box (303c) fixedly connected to the condenser pipe (303a).

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