Air drying system

Abstract

The utility model belongs to the technical field of drying equipment, and relates to an air drying system which comprises a powder concentrator, a mixed fluidized bed and a cyclone which are communicated in sequence, one or more air inlets communicated with the inside of the mixed fluidized bed are also formed in the mixed fluidized bed; and the plurality of air inlets are uniformly distributed in the circumferential direction of the mixed fluidized bed. According to the air drying system, generated coarse calcium oxide is used for drying air, moisture in air is removed, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of drying equipment and relates to an air drying system. Background Art

[0002] In the production of calcium carbide, the finished calcium oxide needs to be pressed into balls first. However, since the temperature during pressing cannot be too high, the finished calcium oxide needs to be cooled. Currently, natural wind is mostly used for cooling. However, since the natural wind carries moisture, the finished calcium oxide reacts with water to form calcium hydroxide. In this way, when the finished calcium oxide is pressed into pellets for use in the production of calcium carbide furnaces, the calcium hydroxide contained in the pellets decomposes at high temperatures to produce calcium carbonate, which is not conducive to the production of calcium carbide furnaces. Therefore, the moisture in the natural wind must be removed during cooling.

[0003] A Chinese patent document with reference publication number CN118236757A discloses a refrigerated compressed air dryer for removing moisture and impurities from compressed air. The working principle of the refrigerated compressed air dryer is to cool the compressed air to below the dew point so that the moisture is condensed out, and at the same time, the impurities in the compressed air are removed through devices such as filters.

[0004] Although existing methods can remove moisture, the use of freezing to remove moisture from natural wind to dry the air has a complex equipment structure and high removal costs. Utility Model Content

[0005] Aiming at the technical problem of high drying cost in the current calcium carbide production, the utility model provides an air drying system which utilizes crude calcium oxide to dry the air, removes moisture in the air separation, and reduces the cost.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An air drying system comprises a powder selector, a mixed fluidized bed and a cyclone which are connected in sequence; an air inlet which is connected to the inside of the mixed fluidized bed is also arranged on the mixed fluidized bed.

[0008] It is further defined that there are one or more air inlets; the multiple air inlets are evenly distributed in the circumferential direction of the mixed fluidized bed.

[0009] It is further defined that a feed port connected to the interior of the mixed fluidized bed is also provided on the mixed fluidized bed; the feed port is located below the air inlet; and the feed port is connected to a powder classifier.

[0010] It is further defined that a first electric valve is provided between the powder selector and the feed port.

[0011] It is further defined that a mixture outlet connected to the interior of the mixing fluidized bed is also provided on the mixing fluidized bed, and the mixture outlet is located above the air inlet; the mixture outlet is connected to the cyclone.

[0012] It is further defined that the air drying system also includes a fan connected to the cyclone.

[0013] It is further defined that the air drying system further includes a pneumatic conveying pump in communication with the cyclone.

[0014] It is further defined that the cyclone is provided with a mixture inlet, a dry gas outlet and a solid material outlet respectively; the mixture inlet is connected with the mixture outlet, the dry gas outlet and the solid material outlet respectively, the dry gas outlet is connected with a fan, and the solid material outlet is connected with a pneumatic conveying pump.

[0015] It is further defined that a second electric valve is also provided between the solid material outlet and the pneumatic conveying pump.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model uses the crude calcium oxide separated by screening as a desiccant to dry the natural wind air and remove moisture, which greatly reduces the air drying cost, realizes the recycling of waste resources, achieves the purpose of cost reduction and energy saving, and meets the requirements of chemical clean production.

[0018] 2. The utility model fully mixes natural air and crude calcium oxide in a mixed fluidized bed, which can accelerate the absorption of moisture in the natural air by the crude calcium oxide. The mixed material is then passed through a cyclone to separate the dried natural air gas from the desiccant solid, thereby improving the moisture absorption efficiency and avoiding entrained moisture.

[0019] 3. In the utility model, the separated dry air enters the finished calcium oxide unit through the fan, and the dry cooling air is used to cool the finished calcium oxide. Since the moisture in the air is completely absorbed, the cooling of the calcium oxide is not affected by the moisture, which is beneficial to the production of the calcium carbide furnace after the ball pressing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an air drying system provided by the utility model;

[0021] in:

[0022] 1—powder selector; 2—first electric valve; 3—mixing fluidized bed; 4—cyclone; 5—finished product cooling unit; 6—fan; 7—second electric valve; 8—pneumatic conveying pump; 9—pressure transmitter; 10—flow transmitter; 11—third electric valve. DETAILED DESCRIPTION

[0023] The technical solution protected by the utility model is now described in detail in conjunction with the accompanying drawings and embodiments. However, it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Unless otherwise defined, the technical terms or scientific terms used in this utility model shall have the usual meanings understood by people with ordinary skills in the field to which this utility model belongs. The words "include" or "comprise" and the like used in this utility model mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] The design idea of ​​the utility model is: because the freezing method removes moisture, the equipment is complex and the cost is high; and some crude calcium oxide is separated and produced in the production of calcium carbide. This part of crude calcium oxide is generally directly stored and processed, and its own function is not fully exerted. Based on this, the utility model provides an air drying system, which uses crude calcium oxide as a desiccant to fully absorb the moisture carried by natural wind air, with a simple structure and low cost.

[0026] Example

[0027] See also Figure 1 This embodiment provides an air drying system, including a powder selector 1, a mixed fluidized bed 3 and a cyclone 4 connected in sequence.

[0028] In this embodiment, the function of the powder concentrator 1 is to separate the coarse calcium oxide by screening, and the coarse calcium oxide is discharged from the bottom of the powder concentrator 1 into the mixed fluidized bed 3.

[0029] In this embodiment, an air inlet communicating with the interior of the mixed fluidized bed 3 is also provided on the mixed fluidized bed 3 and is located in the middle of the lateral side of the mixed fluidized bed 3 , and natural wind air enters the mixed fluidized bed 3 from the air inlet.

[0030] During implementation, there is one air inlet, and natural wind air (humid air) enters the mixed fluidized bed 3 from the air inlet by self-absorption.

[0031] In this embodiment, there are multiple air inlets; the multiple air inlets are evenly distributed in the circumferential direction of the mixed fluidized bed 3, and the multiple air inlets share an air main pipe, so that uniform air intake is achieved through the multiple air inlets.

[0032] Preferably, two air inlets are arranged on the middle side wall of the mixed fluidized bed 3, and the two air inlets are evenly distributed in the circumferential direction of the mixed fluidized bed 3, that is, symmetrically distributed about the axial direction of the mixed fluidized bed 3, and the wet air enters the mixed fluidized bed 3 from the left and right sides in two ways by self-absorption, so as to achieve uniform air intake.

[0033] In this embodiment, a feed port connected to the interior of the mixed fluidized bed 3 is also provided on the mixed fluidized bed 3; the feed port is located below the air inlet; the feed port is connected to the powder selector 1, so as to facilitate the crude calcium oxide selected from the powder selector 1 to enter the mixed fluidized bed 3 through the feed port.

[0034] In this embodiment, a first electric valve 2 is provided between the powder selector 1 and the feed port, and the flow rate of the crude calcium oxide entering the mixed fluidized bed 3 is controlled by the first electric valve 2 .

[0035] In this embodiment, a mixture outlet connected to the interior of the mixed fluidized bed 3 is also provided on the mixed fluidized bed 3, and the mixture outlet is located above the air inlet; the mixture outlet is connected to the cyclone 4. During implementation, in the mixed fluidized bed 3, natural wind air and crude calcium oxide are fully mixed, and the crude calcium oxide acts as a desiccant to fully absorb the moisture carried in the natural wind air. Finally, the mixture enters the cyclone 4 from the mixture outlet to achieve gas-solid separation.

[0036] In this embodiment, the air drying system further includes a fan 6 connected to the cyclone barrel 4 , and the air drying system further includes a pneumatic conveying pump 8 connected to the cyclone barrel 4 .

[0037] During implementation, a mixture inlet, a dry gas outlet and a solid material outlet are respectively arranged on the cyclone 4; the mixture inlet is connected to the mixture outlet, the dry gas outlet and the solid material outlet respectively, the dry gas outlet is connected to the fan 6, and the solid material outlet is connected to the pneumatic conveying pump 8.

[0038] During implementation, the mixture inlet is located at the upper side of the cyclone 4; the drying gas outlet is located at the top of the cyclone 4, and the solid material outlet is located at the bottom of the cyclone 4. The mixture formed by natural wind air and crude calcium oxide is sent into the cyclone 4 from the mixture inlet. The cyclone 4 rotates, and the natural wind air dried by the crude calcium oxide is continuously sent upward from the drying gas outlet to the finished product cooling unit 5 through the fan 6 to cool the finished calcium oxide; and the crude calcium oxide that absorbs moisture continuously falls downward from the solid material outlet and is transported to the grinding head lime bin for storage through the pneumatic conveying pump 8.

[0039] In order to facilitate the transportation of the crude calcium oxide that has absorbed moisture, a compressed air pipeline is externally connected to the pneumatic conveying pump 8, and the pneumatic conveying of the crude calcium oxide that has absorbed moisture is achieved by compressed air, and the crude calcium oxide that has absorbed moisture is discharged to the grinding head lime bin for storage.

[0040] During implementation, the dry air entering the finished product cooling unit 5 enters in two ways. One way enters from the lower side of the finished product cooling unit 5 through the fan 6, and the other way enters from the left and right sides of the middle of the finished product cooling unit 5 in a self-priming manner. The finished calcium oxide in the finished product cooling unit 5 is cooled by the dry air.

[0041] During implementation, on each of the two dry air pipelines entering the finished product cooling unit 5, a pressure transmitter 9, a flow transmitter 10 and a third electric valve 11 are provided to control the dry air entering the finished product cooling unit 5 and to monitor the flow and pressure of the dry air to ensure the normal operation of the system.

[0042] During implementation, the finished product cooling unit 5 is a tank structure, which contains the finished calcium oxide (high temperature) to be cooled. The finished calcium oxide (low temperature) after dry air cooling is discharged from the bottom of the finished product cooling unit 5 for collection and standby use or to be sent to the next process for pelletizing.

[0043] In this embodiment, a second electric valve 7 is further provided between the solid material outlet and the pneumatic conveying pump 8 to facilitate the control of the discharge flow rate of the crude calcium oxide after absorbing moisture.

[0044] The above is a specific implementation method of the utility model. The above embodiment is only for clearly describing the implementation process of the technical solution of the utility model, and is not intended to limit the protection scope of the utility model. All equivalent changes made on the basis of the technical principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An air drying system, characterized in that: The invention comprises a powder selector (1), a mixed fluidized bed (3) and a cyclone (4) which are connected in sequence; the mixed fluidized bed (3) is also provided with an air inlet which is connected to the inside of the mixed fluidized bed (3).

2. The air drying system according to claim 1, characterized in that: There are one or more air inlets; the multiple air inlets are evenly distributed in the circumferential direction of the mixed fluidized bed (3).

3. The air drying system according to claim 2, characterized in that: The mixed fluidized bed (3) is also provided with a feed port connected to the interior of the mixed fluidized bed (3); the feed port is located below the air inlet; and the feed port is connected to the powder selector (1).

4. The air drying system according to claim 3, characterized in that: A first electric valve (2) is arranged between the powder selector (1) and the feed port.

5. The air drying system according to claim 4, characterized in that: The mixing fluidized bed (3) is also provided with a mixture outlet which is in communication with the interior of the mixing fluidized bed (3), and the mixture outlet is located above the air inlet; the mixture outlet is in communication with the cyclone barrel (4).

6. The air drying system according to claim 5, characterized in that: The air drying system also includes a fan (6) connected to the cyclone barrel (4).

7. The air drying system according to claim 6, characterized in that: The air drying system further comprises a pneumatic conveying pump (8) which is in communication with the cyclone barrel (4).

8. The air drying system according to claim 7, characterized in that: The cyclone barrel (4) is provided with a mixed material inlet, a dry gas outlet and a solid material outlet respectively; the mixed material inlet is connected to the mixed material outlet, the dry gas outlet and the solid material outlet respectively, the dry gas outlet is connected to a fan (6), and the solid material outlet is connected to a pneumatic conveying pump (8).

9. The air drying system according to claim 8, characterized in that: A second electric valve (7) is also arranged between the solid material outlet and the pneumatic conveying pump (8).

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