A hot air uniform drying device for pellet production
By designing a hot air uniform drying device for pellet production, the problems of uneven pellet drying and energy waste were solved, achieving uniform drying of pellets and efficient energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XUZHOU BAOJIA INFORMATION TECH CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-26
AI Technical Summary
In traditional pellet drying equipment, the side of the pellets that comes into contact with the conveyor belt is difficult to be evenly exposed to hot air, resulting in uneven drying. Furthermore, the direct emission of heat and moisture causes energy waste.
A hot air uniform drying device was designed, which includes a drying box, a conveyor belt, a heating box, a turning mechanism, and an exhaust system. The symmetrically arranged heating box and turning mechanism ensure that the pellets are heated in all directions, and the exhaust system is used to recover and preheat the air, thereby reducing energy waste.
It achieves uniform drying of pellets, improves drying uniformity by more than 40%, reduces energy consumption by 90%, and reduces the waste of condensate.
Smart Images
Figure CN224415632U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of pellet drying equipment, specifically to a hot air uniform drying device for pellet production. Background Technology
[0002] Pelletizing is a process in which finely ground iron concentrate or other iron-containing powders are mixed with a small amount of additives, moistened with water, rolled into balls by a pelletizing machine, and then dried and roasted at high temperature to solidify into spherical iron-containing raw materials with certain strength and metallurgical properties. Drying equipment is used when drying pellets. Hot air in the drying equipment slowly removes the moisture carried in the pellets to prevent the green pellets from cracking or pulverizing due to rapid evaporation of moisture during the subsequent high-temperature roasting stage. At the same time, it improves the permeability of the material layer to ensure the quality of the pellet ore.
[0003] Pellet drying is accomplished through a combination of surface vaporization and internal moisture diffusion. Water vapor is generated on the surface of the green pellets upon heating. When the surface vapor pressure exceeds the partial vapor pressure of the drying medium, moisture is transferred into the medium through the boundary layer. Simultaneously, the humidity gradient inside the green pellets promotes moisture migration towards the surface, ultimately achieving overall drying.
[0004] Traditional pellet drying equipment often results in uneven drying because the side of the pellets in contact with the conveyor belt is difficult to reach with hot air. Furthermore, the exhaust gas carries a large amount of heat and moisture, which would be wasted if directly discharged. Therefore, we propose a hot air uniform drying device for pellet production. Utility Model Content
[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a hot air uniform drying device for pellet production, which can effectively solve the problems mentioned in the background technology.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] This utility model provides a hot air uniform drying device for pellet production, comprising:
[0008] The drying chamber has two symmetrically distributed mounting slots on its outer side, and the same conveyor belt for transporting pellets is provided on the inner side of the two mounting slots.
[0009] The drying mechanism includes a first heating box and a second heating box installed on a drying chamber. A first exhaust pipe and a second exhaust pipe are fixedly connected to the top of the drying chamber. A heat exchange air inlet pipe is fixedly connected to the top of the first heating box. The other end of the heat exchange air inlet pipe passes through the second exhaust pipe. A partition is fixedly connected to the inside of the drying chamber.
[0010] The material turning mechanism includes a rotating rod movably connected to the inside of the drying chamber via a bearing, a mounting sleeve fixedly connected to the outside of the rotating rod, and a material turning strip fixedly connected to the outside of the mounting sleeve.
[0011] Preferably, a first fan is installed on the top of the first heating box, a first heating tube is installed inside the first heating box, and a densely distributed first air outlet is opened at the bottom of the first heating box.
[0012] Preferably, a second fan is installed on the top of the second heating box, a second heating pipe is installed inside the second heating box, and a densely distributed second air outlet is provided at the bottom of the second heating box.
[0013] Preferably, two baffles symmetrically distributed on both sides of the heat exchange air inlet pipe are fixedly connected to the inner side of the second exhaust duct, and a drain pipe is fixedly connected to the bottom of the second exhaust duct, with a sealing plug installed at the other end of the drain pipe.
[0014] Preferably, the end of the second exhaust duct away from the drying chamber is connected to the interior of the first exhaust duct.
[0015] Preferably, both ends of the rotating rod pass through the outside of the drying chamber and extend to the outside of the drying chamber, and both ends of the rotating rod are fixedly connected to a counterweight block that is eccentrically arranged.
[0016] Preferably, a flat plate is fixedly connected to the inner side of one of the mounting grooves, and a guide plate is fixedly connected to the inner side of one of the mounting grooves.
[0017] The technical solution provided by this utility model has the following advantages compared with the known prior art:
[0018] 1. This utility model, by setting up a drying mechanism, uses a second heating box to dry one side of the pellets entering the conveyor belt. The hot air generated during drying carries the moisture and is discharged through the second exhaust pipe. The air discharged from the second exhaust pipe can preheat the air entering the heat exchange inlet pipe. The preheated air can be heated quickly, and energy consumption is reduced, effectively avoiding energy waste caused by direct air discharge.
[0019] 2. By setting up a baffle, a drain pipe and a sealing plug, when the hot air in the second exhaust duct exchanges heat with the air in the heat exchange inlet duct, the water vapor in the hot air condenses into water upon cooling. The condensed water can be collected through the drain pipe, thus avoiding the waste of water vapor.
[0020] 3. By setting up a turning mechanism, when the pellets are conveyed on the conveyor belt, the hot air discharged from the second heating box can dry one side of the pellets. When the pellets pass through the turning bar, the turning bar can push the pellets to roll, so that the hot air blown out by the first heating box can dry the other side of the pellets, so that the pellets can be dried evenly. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the overall structure of the pellet drying equipment of this utility model;
[0023] Figure 2 This is a schematic cross-sectional view of the drying oven of this utility model.
[0024] Figure 3 This is a schematic cross-sectional view of the second row of air ducts of this utility model;
[0025] Figure 4 This is a schematic cross-sectional view of the second heating box of this utility model;
[0026] Figure 5 This is a schematic diagram of the rotating rod part of this utility model.
[0027] The labels in the diagram represent:
[0028] 1. Drying oven; 2. Conveyor belt; 3. Mounting groove; 4. Drying mechanism; 401. First exhaust duct; 402. First heating chamber; 403. Second exhaust duct; 404. Second fan; 405. Second heating chamber; 406. Partition plate; 407. Heat exchange inlet duct; 408. Baffle plate; 409. Drain pipe; 410. Sealing plug; 411. First heating tube; 412. First air outlet; 413. First fan; 414. Second heating tube; 415. Second air outlet; 5. Turning mechanism; 501. Flat plate; 502. Guide plate; 503. Mounting sleeve; 504. Rotating rod; 505. Turning bar; 506. Counterweight. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0030] The present invention will be further described below with reference to the embodiments. Example 1:
[0031] Reference Figure 1-4 The first embodiment of this utility model discloses a hot air uniform drying device for pellet production, comprising:
[0032] Drying box 1, with two symmetrically distributed mounting slots 3 on the outside of the drying box 1, and the same conveyor belt 2 for conveying pellets is installed inside the two mounting slots 3;
[0033] The drying mechanism 4 includes a first heating box 402 and a second heating box 405 installed on the drying box 1. A first exhaust pipe 401 and a second exhaust pipe 403 are fixedly connected to the top of the drying box 1. A heat exchange air inlet pipe 407 is fixedly connected to the top of the first heating box 402. The other end of the heat exchange air inlet pipe 407 passes through the second exhaust pipe 403. A partition 406 is fixedly connected to the inside of the drying box 1.
[0034] The partition 406 is used to divide the interior of the drying oven 1 into two drying zones for drying the pellets on different sides.
[0035] Specifically, a first fan 413 is installed on the top of the first heating box 402, a first heating tube 411 is installed inside the first heating box 402, and a densely distributed first air outlet 412 is opened at the bottom of the first heating box 402. A second fan 404 is installed on the top of the second heating box 405, a second heating tube 414 is installed inside the second heating box 405, and a densely distributed second air outlet 415 is opened at the bottom of the second heating box 405.
[0036] By symmetrically arranging the first heating box 402 and the second heating box 405, densely packed first air outlets 412 and second air outlets 415 at the bottom, a uniform hot air curtain covering the entire width of the conveyor belt 2 is formed, so that the surface of the pellets is heated evenly, the drying uniformity is improved by more than 40%, and local over-wetting or cracking is avoided.
[0037] Specifically, two baffles 408 symmetrically distributed on both sides of the heat exchange air inlet pipe 407 are fixedly connected to the inner side of the second air duct 403, and a drain pipe 409 is fixedly connected to the bottom of the second air duct 403. A sealing plug 410 is installed at the other end of the drain pipe 409.
[0038] Two baffles 408, together with the second exhaust duct 403, form a condensate collection chamber to collect condensate; the bottom drain pipe 409 is equipped with a sealing plug 410 to achieve periodic drainage.
[0039] Specifically, the end of the second exhaust duct 403 furthest from the drying chamber 1 is connected to the interior of the first exhaust duct 401.
[0040] The air discharged from the second exhaust duct 403 can be incorporated into the exhaust duct 401 for subsequent processing of the air discharged from the first exhaust duct 401. Example 2:
[0041] Reference Figure 1-2 and Figure 5 This is the second embodiment of the present invention, which differs from the first embodiment in that:
[0042] The material turning mechanism 5 includes a rotating rod 504 that is movably connected to the inside of the drying chamber 1 via a bearing. An installation sleeve 503 is fixedly connected to the outside of the rotating rod 504, and a material turning strip 505 is fixedly connected to the outside of the installation sleeve 503.
[0043] Specifically, both ends of the rotating rod 504 pass through the outside of the drying chamber 1 and extend to the outside of the drying chamber 1. Both ends of the rotating rod 504 are fixedly connected to counterweights 506 that are eccentrically arranged.
[0044] The counterweight 506 is used to reset the turning bar 505. The turning action is driven by the kinetic energy and gravitational potential energy of the pellets, without the need for an additional power source, and the energy consumption is reduced by 90% compared with traditional mechanical turning.
[0045] Specifically, a flat plate 501 is fixedly connected to the inner side of one of the mounting slots 3, and a guide plate 502 is fixedly connected to the inner side of one of the mounting slots 3.
[0046] The flat plate 501 and the guide plate 502 work together to control the thickness of the ball layer to ≤5cm, reducing the hot air penetration resistance by 40%.
[0047] The remaining structure is the same as that in Example 1.
[0048] The workflow of this utility model is as follows:
[0049] The pellets that need to be dried enter the conveyor belt 2 set inside the drying chamber 1 through the guide plate 502. The flat plate 501 slows down and flattens the pellets that are about to enter the conveyor belt 2, and the conveyor belt 2 transports the flattened pellets.
[0050] The second heating tube 414 heats the air inside the second heating box 405. The second fan 404 blows the heated air toward the conveyor belt 2 to dry the pellets on the conveyor belt 2. As hot air is injected, the air carries the water vapor generated during drying and is discharged through the second exhaust duct 403. The hot air in the second exhaust duct 403 exchanges heat with the air in the heat exchange inlet duct 407. The water vapor in the hot air condenses and is stored between the two baffles 408 after encountering cold. The sealing plug 410 is opened periodically, and the collected water can be collected through the drain pipe 409.
[0051] The conveyor belt 2 continues to move the pre-dried pellets. The pellets on the conveyor belt 2 can lift one side of the turning bar 505. As the pellets continue to move, the pellets separate from the turning bar 505. The turning bar 505 is reset under the action of the counterweight 506. When the turning bar 505 is reset, it drives the pellets to roll under the action of friction, turning them over.
[0052] The preheated air enters the first heating box 402 under the action of the first fan 413. The first heating tube 411 in the first heating box 402 heats the preheated air and discharges it through the first air outlet 412, blowing it toward the pellets on the conveyor belt 2 to dry the other side of the pellets.
[0053] After drying, the pellets are output through the other end of conveyor belt 2 and enter the next process. The hot air generated during drying is discharged through the first exhaust pipe for treatment or utilization.
[0054] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.
Claims
1. A hot air uniform drying device for pellet production, characterized by, include: Drying box (1), with two symmetrically distributed mounting slots (3) on the outside of the drying box (1), and the same conveyor belt (2) for pellet conveying is provided on the inside of the two mounting slots (3); The drying mechanism (4) includes a first heating box (402) and a second heating box (405) installed on the drying box (1). The top of the drying box (1) is fixedly connected to a first exhaust pipe (401) and a second exhaust pipe (403). The top of the first heating box (402) is fixedly connected to a heat exchange air inlet pipe (407). The other end of the heat exchange air inlet pipe (407) passes through the second exhaust pipe (403). A partition (406) is fixedly connected to the inside of the drying box (1). The material turning mechanism (5) includes a rotating rod (504) that is movably connected to the inside of the drying box (1) via a bearing. An installation sleeve (503) is fixedly connected to the outside of the rotating rod (504), and a material turning strip (505) is fixedly connected to the outside of the installation sleeve (503).
2. The hot air uniform drying device for pellet production according to claim 1, characterized in that, The first heating box (402) is equipped with a first fan (413) on the top, a first heating tube (411) is installed inside the first heating box (402), and a first air outlet (412) is opened at the bottom of the first heating box (402) in a densely distributed manner.
3. The hot air uniform drying device for pellet production according to claim 1, characterized in that, The second heating box (405) is equipped with a second fan (404) on the top, a second heating tube (414) is installed inside the second heating box (405), and a second air outlet (415) is opened at the bottom of the second heating box (405) in a densely distributed manner.
4. The hot air uniform drying device for pellet production according to claim 1, characterized in that, The inner side of the second exhaust duct (403) is fixedly connected to two baffles (408) symmetrically distributed on both sides of the heat exchange air inlet duct (407). The bottom of the second exhaust duct (403) is fixedly connected to a drain pipe (409), and a sealing plug (410) is installed at the other end of the drain pipe (409).
5. A hot air uniform drying device for pellet production according to claim 1, characterized in that, The end of the second exhaust duct (403) away from the drying box (1) is connected to the interior of the first exhaust duct (401).
6. The hot air uniform drying device for pellet production according to claim 1, characterized in that, Both ends of the rotating rod (504) pass through the outside of the drying box (1) and extend to the outside of the drying box (1). Both ends of the rotating rod (504) are fixedly connected to counterweights (506) arranged eccentrically.
7. A hot air uniform drying device for pellet production according to claim 1, characterized in that, A flat plate (501) is fixedly connected to the inner side of one of the mounting grooves (3), and a guide plate (502) is fixedly connected to the inner side of one of the mounting grooves (3).