Efficient energy-saving direct-fired dryer

Abstract

The utility model discloses an efficient energy-saving direct combustion type dryer, which comprises a drying box and a transmission mesh belt arranged in the drying box, the drying box is divided into more than two drying units, each drying unit comprises a drying chamber, an air supply channel, an air outlet channel, a combustion chamber and a hot air cavity, and the air supply channel and the air outlet channel are respectively arranged on two sides of the drying chamber. A combustor is arranged in the combustion chamber, one side of the combustion chamber is communicated with the hot air cavity, the other side of the combustion chamber is communicated with the air outlet channel, a fresh air inlet is formed in the top wall of the combustion chamber, the hot air cavity is communicated with the air supply channel, the air supply channel of one drying unit is communicated with the upper portion of the conveying mesh belt, and the air outlet channel is communicated with the lower portion of the conveying mesh belt. The air supply channels of the adjacent drying units communicate with the lower portion of the conveying mesh belt, the air outlet channels communicate with the upper portion of the conveying mesh belt, and moisture exhaust ports are formed in the tops of the air outlet channels. Heated hot air sequentially and alternately penetrates through the conveying mesh belt, materials are dried more sufficiently, and the drying efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of drying equipment, in particular to a high-efficiency and energy-saving direct-fired drying machine. Background Art

[0002] Many materials require drying during the production process. This drying process typically involves evaporating and removing moisture from the materials through hot air. Currently, most dryers on the market utilize steam or gas heating. Steam heating, a form of indirect heating, results in significant heat loss during the heat exchange process, resulting in low energy efficiency. Gas heating, on the other hand, directly burns fuel to generate hot air, which directly contacts and heats the materials. This reduces fuel consumption by approximately 20% to 50% compared to steam or other indirect heating methods. However, some drawbacks remain. For example, the hot air is often directed directly above the material being dried, drying only the upper portion of the material. This results in temperature differences between the upper and lower portions of the material, lowering drying efficiency, and impacting drying quality. Furthermore, the exhausted wet air carries away heat, resulting in incomplete thermal energy utilization and high production and operating costs. Summary of the Invention

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides a high-efficiency and energy-saving direct-fired dryer with high drying efficiency and low operating cost.

[0004] The technical solution adopted by the present invention is as follows: a high-efficiency and energy-saving direct-fired dryer, comprising a drying box and a single-layer or multi-layer transmission mesh belt arranged in the drying box, the drying box is divided into more than two drying units, each drying unit comprises a drying chamber, an air supply channel, an air outlet channel, a combustion chamber, and a hot air cavity, the transmission mesh belt is located in the drying chamber, and openings for the transmission mesh belt to pass through are provided on the front and rear side walls of the drying chamber, the two sides of the drying chamber are respectively an air supply channel and an air outlet channel, the combustion chamber and the hot air cavity are located above the drying chamber, a burner is provided on the side of the combustion chamber close to the air supply channel, the side of the combustion chamber close to the burner is connected to the hot air cavity, and the remote The side away from the burner is connected to the air outlet channel, a fresh air inlet is provided on the top wall of the combustion chamber, the hot air chamber is connected to the air supply channel, and a blower is provided in the air supply channel corresponding to the hot air chamber. The blower draws the hot air in the hot air chamber into the air supply channel. The air supply channel of one drying unit is connected to the side wall of the drying chamber above the transmission mesh belt, and the air outlet channel is connected to the side wall of the drying chamber below the transmission mesh belt. The air supply channel of the drying unit adjacent to the drying unit is connected to the side wall of the drying chamber below the transmission mesh belt, and the air outlet channel is connected to the side wall of the drying chamber above the transmission mesh belt. A dehumidification port is provided on the top of the air outlet channel.

[0005] Furthermore, the moisture dehumidification port is arranged on a side of the top of the air outlet channel away from the combustion chamber.

[0006] Furthermore, a regulating valve plate for adjusting the opening and closing degree is provided at the fresh air inlet.

[0007] Furthermore, the blower is driven by a variable frequency motor.

[0008] Furthermore, an openable inspection door is provided on the side wall of the air supply channel and / or the air outlet channel.

[0009] Furthermore, the wall of the drying box is provided with a thermal insulation layer.

[0010] Furthermore, a cooling device is provided at the conveyor belt in the discharge section outside the drying box. The cooling device includes an axial flow fan installed on one side of the conveyor belt. An air collecting chamber is provided under the conveyor belt. The air inlet end of the axial flow fan is connected to the air collecting chamber. The cold air passes through the conveyor belt to cool the material and is then discharged through the air collecting chamber and the axial flow fan.

[0011] The beneficial effects of the present invention are:

[0012] The dryer of the utility model is provided with more than two drying units, each drying unit is an independent hot air convection system, and the heated hot air alternately passes through the transmission mesh belt from top to bottom and from bottom to top to complete the heat and material transfer process, so that the material is dried more fully and the drying efficiency is high; the hot air circulates back and forth completely in the drying chamber to take away moisture, and when the pressure reaches a certain level, it is naturally discharged from the dehumidification port without taking away a large amount of heat, thereby saving energy and being efficient; a cooling device is provided in the discharge section to quickly cool the dried material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a top view schematic diagram of the present utility model.

[0015] Figure 3 、 Figure 4 It is a cross-sectional schematic diagram of two adjacent drying units in the present utility model.

[0016] Figure 5 It is a cross-sectional schematic diagram of the combustion chamber and the hot air cavity in the utility model.

[0017] Figure 6 It is a structural schematic diagram of the cooling device of the present utility model. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described in more comprehensive and detailed manner below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0019] like Figures 1-6 As shown, a high-efficiency and energy-saving direct-fired dryer of this embodiment includes a drying box 2 and a transmission mesh belt 1. The transmission mesh belt in the drying box 2 can be single-layer or multi-layer. This embodiment takes a single layer as an example. The transmission mesh belt 1 runs through the drying box 2, and one side of the feed end is connected to the material distribution machine. The wet material is evenly spread on the transmission mesh belt 1 through the material distribution machine.

[0020] In this embodiment, the drying box 2 is divided into two or more drying units, each drying unit is an independent hot air convection system, and the hot air of adjacent drying units passes through the transmission mesh belt 1 in opposite directions. In this embodiment, there are two drying units. The hot air in the drying unit on the side close to the feed end passes through the transmission mesh belt 1 from top to bottom, and the hot air in the other drying unit passes through the transmission mesh belt 1 from bottom to top. For details, see Figure 3 、 Figure 4 .

[0021] Each drying unit includes a drying chamber 201, an air supply channel 202, an air outlet channel 207, a combustion chamber 204, and a hot air cavity 208. The transmission mesh belt 1 is located in the drying chamber 201 and the front and rear side walls of the drying chamber 201 are provided with openings for the transmission mesh belt 1 to pass through. The two sides of the drying chamber 201 are respectively the air supply channel 202 and the air outlet channel 207. The combustion chamber 204 and the hot air cavity 208 are located above the drying chamber 201. The combustion chamber 204 is provided with a burner 209 on the side close to the air supply channel 202. The side of the combustion chamber 204 close to the burner 209 is connected to the hot air cavity 208, and the side away from the burner 209 is connected to the air outlet channel 207. The top wall of the combustion chamber 204 is provided with a fresh air inlet 20 5. The hot air chamber 208 is communicated with the air supply channel 202. A blower 203 is provided in the air supply channel 202 corresponding to the hot air chamber 208. The blower 203 sucks the hot air in the hot air chamber and sends it into the air supply channel 202. The air supply channel 202 of one drying unit is communicated with the side wall of the drying chamber 201 located above the transmission mesh belt 1, and the air outlet channel 207 is communicated with the side wall of the drying chamber 201 located below the transmission mesh belt 1. The air supply channel 202 of the drying unit adjacent to the drying unit is communicated with the side wall of the drying chamber 201 located below the transmission mesh belt 1, and the air outlet channel 207 is communicated with the side wall of the drying chamber 201 located above the transmission mesh belt 1. A dehumidification port 206 is provided on the top of the air outlet channel 207.

[0022] By adopting the above technical solution, the heated hot air passes through the transmission mesh belt 1 twice, from top to bottom and from bottom to top, to complete the heat and material transfer process, making the material drying more uniform and sufficient, and improving the drying quality and efficiency. The hot air temperature can be adjusted by the amount of flame sprayed by the burner. Under the negative pressure formed by the blower 203, the hot air in the air outlet duct 207 is heated again by the burner to achieve cyclic heating of the material, so that the heat energy is fully utilized. Fresh air is added through the fresh air inlet 205, and the moisture is removed from the material and then discharged from the top dehumidification port 206. Too much fresh air will destroy the hot air circulation, and a large amount of wet air discharged will take away heat. While realizing the recycling of hot air, the utility model balances the amount of fresh air added and the blower speed adjustment. After the pressure in the drying chamber reaches a certain level, the moisture is naturally discharged from the dehumidification port 206, which will not cause a large amount of heat to be taken away, thereby saving energy and being efficient.

[0023] In this embodiment, in order to reduce the amount of wet air discharged, the moisture discharge port 206 is arranged on the top of the air outlet channel 207 on a side away from the combustion chamber 204.

[0024] In this embodiment, in order to facilitate the adjustment of the amount of fresh air supplied, a regulating valve plate for adjusting the opening and closing degree is provided at the fresh air inlet 205 .

[0025] In this embodiment, in order to facilitate the adjustment of the air supply volume, the blower 203 is driven by a variable frequency motor.

[0026] In this embodiment, in order to facilitate maintenance and cleaning of scattered materials, an openable maintenance door 3 is provided on the side wall of the air supply channel 202 and / or the air outlet channel 207.

[0027] In this embodiment, in order to further reduce heat loss, the wall of the drying box 2 is provided with a heat-insulating layer.

[0028] In this embodiment, to accelerate the cooling of the dried material, a cooling device 4 is installed on the conveyor belt 1 at the discharge section outside the drying box 2. This cooling device 4 includes an axial flow fan 401 mounted on one side of the conveyor belt 1. An air collecting chamber 402 is provided below the conveyor belt 1. The air inlet of the axial flow fan 401 is connected to the air collecting chamber 402. Cold air passes through the conveyor belt 1 to cool the material before being discharged through the air collecting chamber 402 and the axial flow fan 401. The cooled material is then fed into the subsequent production process.

[0029] Many modifications and other embodiments of the present invention will occur to those skilled in the art with the aid of the teachings presented in the foregoing description and the associated drawings. Therefore, it is to be understood that the present invention is not limited to the specific embodiments disclosed, and modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A high-efficiency and energy-saving direct-fired dryer, comprising a drying box (2) and a single-layer or multi-layer transmission mesh belt (1) arranged in the drying box (2), characterized in that: The drying box (2) is divided into more than two drying units, each of which includes a drying chamber (201), an air supply channel (202), an air outlet channel (207), a combustion chamber (204), and a hot air cavity (208). The transmission mesh belt (1) is located in the drying chamber (201), and openings for the transmission mesh belt (1) to pass through are provided on the front and rear side walls of the drying chamber (201). The two sides of the drying chamber (201) are the air supply channel (202) and the air outlet channel (207), respectively. The combustion chamber (204) and the hot air cavity (208) are located above the drying chamber (201). A burner (209) is provided on the side of the combustion chamber (204) close to the air supply channel (202). The side of the combustion chamber (204) close to the burner (209) is connected to the hot air cavity (208), and the side away from the burner (209) is connected to the air outlet channel (207). ) The top wall is provided with a fresh air inlet (205), the hot air cavity (208) is communicated with the air supply channel (202), and a blower (203) is provided in the air supply channel (202) corresponding to the hot air cavity (208), and the blower (203) sucks the hot air in the hot air chamber and sends it into the air supply channel (202), wherein the air supply channel (202) of one drying unit is communicated with the side wall of the drying chamber (201) located above the transmission mesh belt (1), and the air outlet channel (207) is communicated with the side wall of the drying chamber (201) located below the transmission mesh belt (1), and the air supply channel (202) of the drying unit adjacent to the drying unit is communicated with the side wall of the drying chamber (201) located below the transmission mesh belt (1), and the air outlet channel (207) is communicated with the side wall of the drying chamber (201) located above the transmission mesh belt (1), and a dehumidification port (206) is provided at the top of the air outlet channel (207).

2. The high-efficiency and energy-saving direct-fired dryer according to claim 1, characterized in that: The moisture discharge port (206) is arranged on a side of the top of the air outlet channel (207) away from the combustion chamber (204).

3. The high-efficiency and energy-saving direct-fired dryer according to claim 1, characterized in that: The fresh air inlet (205) is provided with a regulating valve plate for adjusting the opening and closing degree.

4. The high-efficiency and energy-saving direct-fired dryer according to claim 1, characterized in that: The blower (203) is driven by a variable frequency motor.

5. The high-efficiency and energy-saving direct-fired dryer according to claim 1, characterized in that: An openable inspection door (3) is provided on the side wall of the air supply channel (202) and / or the air outlet channel (207).

6. The high-efficiency and energy-saving direct-fired dryer according to claim 1, characterized in that: The wall of the drying box (2) is provided with a heat-insulating layer.

7. A high-efficiency, energy-saving direct-fired dryer according to any one of claims 1 to 6, characterized in that: A cooling device (4) is provided at the conveyor mesh belt (1) at the discharge section outside the drying box (2). The cooling device (4) comprises an axial flow fan (401) installed on one side of the conveyor mesh belt (1). An air collecting chamber (402) is provided below the conveyor mesh belt (1). An air inlet end of the axial flow fan (401) is connected to the air collecting chamber (402). Cold air passes through the conveyor mesh belt (1) to cool the material and is then discharged through the air collecting chamber (402) and the axial flow fan (401).

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