Tea leaf fixation hot-blast stove

Abstract

The utility model discloses a tea leaf fixation hot-blast stove which comprises a box body and a hot air chamber arranged in the box body, one end of the hot air chamber is provided with a hot air outlet, a combustion chamber is arranged in the hot air chamber, the combustion chamber is connected with a group of heat exchange box bodies in series, and the tail ends of the heat exchange box bodies are connected with a smoke exhaust device. An air inlet chamber is arranged at one end of the hot air chamber in the box body, a group of heat exchange pipes communicated with the air inlet chamber are arranged in the heat exchange box body, and air in the air inlet chamber sequentially enters the heat exchange pipes of the heat exchange box body for heat exchange, then enters the hot air chamber and is discharged from the hot air outlet. Heat generated by fuel combustion can be fully utilized, heat dissipation loss and smoke exhaust heat loss are effectively reduced, the heat conversion rate is remarkably improved, and the hot blast stove can be widely applied to the field of tea leaf fixation hot blast stoves.

Description

Technical Field

[0001] This utility model relates to the field of tea processing technology, and in particular to a hot air furnace for fixing tea leaves. Background Technology

[0002] Fixing tea leaves is an important step in tea processing. Currently, there are two main heating fixation structures: one is to heat the inner wall of the fixation drum and fix the leaves through heat conduction, and the other is to directly blow hot air onto the tea leaves to fix them.

[0003] The structure of tea leaves subjected to heat conduction during fixation is prone to scorching at the edges. Therefore, more and more companies are now using high-temperature air fixation, which involves blowing high-temperature air directly into the fixation drum through a tea fixation hot air furnace. This requires the tea fixation hot air furnace to generate sufficiently high-temperature gas to achieve rapid and thorough fixation. Existing tea fixation hot air furnaces suffer from high energy consumption and a low heat conversion rate, with a large portion of the heat being directly dissipated. Therefore, not only is the temperature of the hot air blown out by the tea fixation hot air furnace not high, but energy consumption is also high.

[0004] In addition, the existing hot air furnaces for fixing tea leaves are not effective at treating flue gas. A large portion of the soot, dust and other impurities generated during fuel combustion are emitted into the air with the flue gas, causing pollution to the surrounding environment. Utility Model Content

[0005] The purpose of this utility model is to provide a hot air furnace for fixing tea leaves, which solves the problems of high energy consumption and low heat conversion rate of existing hot air furnaces for fixing tea leaves.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hot air furnace for fixing tea leaves, comprising a housing, a hot air chamber disposed within the housing, a hot air outlet disposed at one end of the hot air chamber, a combustion chamber disposed within the hot air chamber, a set of heat exchange boxes connected in series to the combustion chamber, and a smoke exhaust device connected to the heat exchange box at the end.

[0007] An air inlet gap is provided between the housing, the hot air chamber, and the heat exchange box. A set of air inlet grilles is provided above the end of the housing near the hot air chamber. An air inlet chamber is provided at the end of the housing away from the hot air chamber. A suction fan is connected to the top of the air inlet chamber. The air inlet end of the suction fan is fixed to the housing and communicates with the air inlet gap. A set of heat exchange pipes communicating with the air inlet chamber is provided inside the heat exchange box. Air enters the air inlet gap from the air inlet grille, then enters the air inlet chamber through the suction fan. The air in the air inlet chamber enters the heat exchange pipes of the heat exchange box for heat exchange before entering the hot air chamber, and finally exits from the hot air outlet.

[0008] A hot air mixing chamber is provided between two adjacent heat exchange boxes and between a heat exchange box and a hot air chamber. The heat exchange tubes are arranged horizontally and the heat exchange tubes on two adjacent heat exchange boxes are staggered.

[0009] To facilitate rapid settling of soot and reduce environmental pollution caused by smoke and dust being released into the air from the exhaust system, a vertical partition is installed inside the heat exchange box. A connecting port is provided between the vertical partition and the bottom of the heat exchange box, dividing the internal cavity of the heat exchange box into interconnected flue gas channels at the bottom. Flue gas passages are provided between the top of the combustion chamber and the top of the heat exchange box, as well as between the tops of two adjacent heat exchange boxes. The flue gas from the combustion chamber enters the flue gas passage on one side of the heat exchange box and then flows downwards, entering the flue gas passage on the other side through the connecting port, and finally exiting through the flue gas passage at the top into the next heat exchange box.

[0010] To fully utilize the heat of the flue gas, the exhaust device includes an exhaust fan installed on the top of the heat exchange box adjacent to the air inlet chamber; a vertical flue is provided on the other side of the air inlet chamber relative to the heat exchange box, and a flue gas connecting pipe is provided between the vertical flue and the outlet of the exhaust fan; a bottom flue is provided at the bottom of the air inlet chamber, which is connected to the vertical flue; a set of spaced exhaust pipes are provided at the end of the bottom flue near the heat exchange box, and an exhaust chimney is connected above the exhaust pipes.

[0011] Furthermore, the width of the vertical flue is adapted to the width of the side wall of the air inlet chamber, and the size of the bottom flue is adapted to the bottom area of ​​the air inlet chamber.

[0012] To facilitate the uniform entry of air into the heat exchange tubes within the air inlet chamber, a set of air guide plates is installed on the side wall of the air inlet chamber away from the heat exchange box body, running from top to bottom. The air guide plates are horizontally arranged and gradually increase in length from top to bottom.

[0013] To facilitate the recovery of ash from the flue gas, ash collection chambers are provided at the bottom of the combustion chamber, heat exchange box, and bottom flue, and openable doors are provided at the ports of the ash collection chambers.

[0014] The beneficial effects of this utility model are:

[0015] 1. After external cold air is drawn into the air inlet gap by a suction fan, the cold air is heated sequentially using the residual heat radiated from the hot air chamber and the outer wall of the heat exchange box, recovering the heat that would otherwise be directly lost from the equipment. Secondly, the air is heated by the heat from the flue gas discharged from the combustion chamber within the heat exchange box, recovering the heat from the flue gas. Finally, the air is heated by the high temperature generated by combustion in the combustion chamber, forming a high-temperature hot air output. This invention maximizes the utilization of heat generated by fuel combustion, effectively reducing heat dissipation and exhaust heat loss, significantly improving the heat conversion rate. Compared to existing hot air furnaces, energy consumption is greatly reduced, while a stable output of high-temperature hot air ensures that the requirements for rapid, thorough, and uniform fixation of tea leaves are met, guaranteeing tea quality.

[0016] 2. The heat exchange chamber is divided into two flue gas ducts by vertical partitions, increasing the flow path of the flue gas and thus increasing the heating area between the flue gas and the heat exchange tubes, thereby improving the heat conversion rate. The flue gas flows from top to bottom in one flue gas duct of the heat exchange chamber, and then flows from bottom to top in the other flue gas duct of the same heat exchange chamber. This helps ash particles in the flue gas settle and separate under the influence of gravity, reducing the amount of soot particles emitted and lowering environmental pollution. Simultaneously, the vertical arrangement of the vertical flue, bottom flue, and exhaust pipe facilitates the settling and separation of ash particles in the flue gas under the influence of gravity and inertia, leaving them in the bottom flue. Furthermore, ash collection chambers are provided at the bottom of the combustion chamber, heat exchange chamber, and bottom flue, allowing for convenient centralized cleaning of deposited ash and preventing ash accumulation from affecting equipment operation and flue gas emission efficiency.

[0017] 3. The heat exchange tubes on adjacent heat exchange chambers are staggered, so that air flowing out of one heat exchange tube cannot enter the next heat exchange tube in a straight line. Instead, it must first impact the outer wall of the next heat exchange chamber. This impact disturbs the air, ensuring thorough mixing and preventing localized overheating or uneven heating. This guarantees a uniform and stable output hot air temperature. Uniform and stable high-temperature hot air ensures even heating of the tea leaves, effectively preventing problems such as scorching edges and incomplete processing, further improving the appearance and internal quality of the tea. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention.

[0019] Figure 2 This is a top view of the present invention.

[0020] Figure 3 for Figure 2 Sectional view along direction A.

[0021] Figure 4 This is a perspective view of the internal structure of this utility model.

[0022] Figure 5 This is a top view of the internal structure of this utility model.

[0023] Figure 6 This is a schematic diagram of the internal structure of the heat exchange box in this utility model.

[0024] Figure 7 This is a top view of the assembly of the hot air chamber, combustion chamber, and heat exchange box adjacent to the hot air chamber of this utility model. Detailed Implementation

[0025] Examples, such as Figure 1-7 As shown, a hot air furnace for fixing tea leaves includes a housing 1, an air inlet grille 11 disposed on the housing 1, a hot air chamber 2 disposed inside the housing 1, a hot air outlet 21 disposed at one end of the hot air chamber 2, a combustion chamber 3 disposed inside the hot air chamber 2, a set of heat exchange boxes 4 connected in series to the combustion chamber 3, a smoke exhaust device 5 connected to the end of the heat exchange boxes 4, an air inlet chamber 6 disposed at the end of the housing 1 away from the hot air chamber 2, and a suction fan 7 connected to the air inlet chamber 6. Air from outside the housing 1 is drawn into the housing 1 through the air intake grille 11 by the suction fan 7. The air is heated by waste heat emanating from the hot air chamber 2, combustion chamber 3, and heat exchange chamber 4. The air then flows from the air intake chamber 6 into the heat exchange chamber 4, where it is further heated by flue gas extracted from the combustion chamber 3 by the exhaust device 5. Finally, the air flows into the hot air chamber 2, where it is heated by the high temperature generated by fuel combustion in the combustion chamber 3, and then output as hot air from the hot air outlet 21. This invention achieves efficient utilization of thermal energy, significantly reduces exhaust heat loss and system heat dissipation loss, has a high heat conversion rate, and effectively reduces energy consumption.

[0026] Specifically:

[0027] A gap is left between the housing 1, the hot air chamber 2, and the heat exchange housing 4, forming an air inlet gap 100 for airflow. A set of air inlet grilles 11, communicating with the air inlet gap 100, is provided above one end of the housing 1 near the hot air chamber 2. Correspondingly, an air intake fan 7 is connected to the air inlet chamber 6. The air inlet end of the air intake fan 7 is fixed to the housing 1 and communicates with the air inlet gap 100, while the air outlet end of the air intake fan 7 communicates with the air inlet end of the air inlet chamber 6. When the equipment is running, the air intake fan 7 is activated, and outside air from the housing 1 is drawn into the air inlet gap 100 through the air inlet grilles 11. Within the air inlet gap 100, the air flows through the hot air chamber 2, the combustion chamber 3, and the outer wall area of ​​the heat exchange housing 4. During this flow, the air absorbs the waste heat emitted from these components, raising the air temperature and thus recovering the heat that would otherwise be lost. This design effectively reduces heat loss and improves energy efficiency.

[0028] The air outlet of the air inlet chamber 6 is connected to the air inlet of the heat exchange box 4. A set of heat exchange pipes 41 connected to the air inlet chamber 6 are installed inside the heat exchange box 4. The air in the air inlet chamber 6 enters the heat exchange pipes 41 of the heat exchange box 4 for heat exchange and then enters the hot air chamber 2, and exits from the hot air outlet 21. A flue gas passage 8 is provided above the combustion chamber 3 between the combustion chamber 3 and the heat exchange box 4, and between two adjacent heat exchange boxes 4. A vertical partition 42 is provided inside the heat exchange box 4. A communication opening 44 is left between the lower end of the vertical partition 42 and the bottom inner wall of the heat exchange box 4. The vertical partition 42 divides the inner cavity of the heat exchange box 4 into two interconnected flue gas passages 43. Under the action of the exhaust device 5, the flue gas generated by fuel combustion in the combustion chamber 3 enters the flue gas ducts 43 of each heat exchange box 4 sequentially through the flue gas channel 8. In each heat exchange box 4, the flue gas first flows from top to bottom in one flue gas duct 43, then flows through the connecting port 44 to another flue gas duct 43, and finally flows from bottom to top in the flue gas duct 43. During this process, the flue gas contacts the outer surface of the heat exchange tube 41, and the air contacts the inner surface of the heat exchange tube 41. The heat from the flue gas is conducted through the heat exchange tube 41 to heat the air inside the heat exchange tube 41, thereby recovering the heat that would otherwise be emitted with the flue gas. This effectively reduces heat loss and improves energy utilization efficiency.

[0029] The combustion chamber 3 is connected to an automatic feeding hopper 31 and a combustion air inlet 32. The automatic feeding hopper 31 enables automatic feeding to ensure continuous combustion.

[0030] The inner walls on both sides of the hot air chamber 2 are spaced apart from the outer wall of the combustion chamber 3, forming two heating channels 22 that are attached to the outer wall of the combustion chamber 3. The air inlet ends of the two heating channels 22 are connected to the air outlet ends of the heat exchange tubes 41 on the adjacent heat exchange box 4, and the air outlet ends converge and connect to the hot air outlet 21. When air flows along the heating channels 22 to the hot air outlet 21, the high temperature generated by combustion in the combustion chamber 3 is conducted to the air in the heating channels 22 through the outer wall of the combustion chamber 3, thereby forming high-temperature hot air that is blown out from the hot air outlet 21.

[0031] The heat exchange tubes 41 are arranged horizontally, and the heat exchange tubes 41 on adjacent heat exchange boxes 4 are staggered vertically. A hot air mixing chamber 9 is provided between adjacent heat exchange boxes 4 and between the heat exchange box 4 and the hot air chamber 2. The hot air mixing chamber 9 is isolated from the air inlet gap 100 and is not interconnected. When air flows out from the heat exchange tube 41 on one heat exchange box 4, it first enters the hot air mixing chamber 9 and then flows into the heat exchange tube 41 on the next heat exchange box 4. When air flows out from the heat exchange tube 41 on the last heat exchange box 4, it first enters the hot air mixing chamber 9 and then flows into the hot air chamber 2. Because the heat exchange tubes 41 on the two adjacent heat exchange boxes 4 are staggered, the air flowing out of the heat exchange tube 41 on one heat exchange box 4 cannot enter the heat exchange tube 41 on the next heat exchange box 4 in a straight line. Instead, it first hits the outer wall of the next heat exchange box 4. The impact can disturb the air, so that the air is fully mixed before entering the heat exchange tube 41 on the next heat exchange box 4, avoiding local overheating, thereby significantly improving the uniformity of the overall heat exchange effect.

[0032] The exhaust device 5 includes an exhaust fan 51 installed on top of the heat exchange box 4 adjacent to the air inlet chamber 6. The air inlet of the exhaust fan 51 is connected to the flue gas duct 43 of the adjacent heat exchange box 4. A vertical flue 52 is provided on the other side of the air inlet chamber 6 opposite to the heat exchange box 4. A flue gas connecting pipe 53 is provided between the vertical flue 52 and the outlet of the exhaust fan 51. A bottom flue 54 connected to the vertical flue 52 is provided at the bottom of the air inlet chamber 6. A set of spaced exhaust pipes 55 are provided near the air inlet of the heat exchange box 4 on the bottom flue 54. An exhaust chimney 56 is connected above the exhaust pipes 55. During operation, the exhaust fan 51 draws the flue gas from the combustion chamber 3 into the flue gas duct 43, then into the vertical flue 52, and finally discharges it from the exhaust chimney 56 through the bottom flue 54 and the exhaust pipes 55. The exhaust pipe 55 is positioned close to the air inlet of the heat exchange chamber 4, allowing the residual heat emitted from the exhaust pipe 55 to be absorbed by the air before it flows from the air inlet chamber 6 into the heat exchange tubes 41 of the heat exchange chamber 4. Simultaneously, both the vertical flue 52 and the exhaust pipe 55 are perpendicular to the bottom flue 54, causing the flue gas to first flow downwards in the vertical flue 52, then horizontally in the bottom flue 54, and finally upwards in the exhaust pipe 55. During this process, ash particles in the flue gas, under the influence of gravity and inertia, easily settle and separate at the vertically formed corners and remain in the bottom flue 54, effectively reducing the dust content of the emitted flue gas and minimizing environmental pollution.

[0033] The width of the vertical flue 52 is adapted to the width of the side wall of the air inlet chamber 6, and the size of the bottom flue 54 is adapted to the bottom area of ​​the air inlet chamber 6. By cooperating with the vertical flue 52 and the bottom flue 54 to partially enclose the air inlet chamber 6, the residual heat lost from the vertical flue 52 and the bottom flue 54 can be fully utilized to heat and insulate the air inside the air inlet chamber 6, thereby further reducing heat loss.

[0034] To reduce the area occupied by the equipment in the factory, the suction fan 7 is fixed to the top area of ​​the housing 1 of the air inlet chamber 6, and correspondingly, the air inlet of the air inlet chamber 6 is also located at its top. Compared with the arrangement of the suction fan 7 suspended on the side wall of the housing 1, this solution can significantly reduce the lateral space occupied. At the same time, the air discharged from the suction fan 7 is blown into the air inlet chamber 6 from top to bottom. In order to facilitate the flow of air into the heat exchange tubes 41 of the heat exchange box 4, a set of air guide plates 61 are arranged from top to bottom on the side wall of the air inlet chamber 6 away from the heat exchange box 4. The air guide plates 61 are horizontally arranged and gradually lengthen from top to bottom. The air blown into the air inlet chamber 6 from top to bottom will hit the air guide plates 61, and under the guidance of the air guide plates 61 and the inner wall of the air inlet chamber 6, the air is pushed towards the heat exchange tubes 41, thereby facilitating air intake.

[0035] To facilitate ash removal, ash collection chambers 10 are provided at the bottom of the combustion chamber 3, heat exchange box 4, and bottom flue 54, and openable hatches 101 are provided at the ports of the ash collection chambers 10. During routine maintenance, the deposited ash can be collected and cleaned simply by opening the corresponding hatches 101.

[0036] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A hot air furnace for fixing tea leaves, characterized in that: Includes a housing (1), a hot air chamber (2) set inside the housing (1), a hot air outlet (21) at one end of the hot air chamber (2), a combustion chamber (3) set inside the hot air chamber (2), a set of heat exchange boxes (4) connected in series in the combustion chamber (3), and a smoke exhaust device (5) connected to the heat exchange box (4) at the end. An air inlet gap (100) is provided between the housing (1), the hot air chamber (2), and the heat exchange housing (4). A set of air inlet grilles (11) is provided above the end of the housing (1) closest to the hot air chamber (2). An air inlet chamber (6) is provided at the end of the housing (1) away from the hot air chamber (2). A suction fan (7) is connected above the air inlet chamber (6), and the air inlet end of the suction fan (7) is fixed to the housing (1). And connected to the air inlet gap (100); the heat exchange box (4) is provided with a set of heat exchange pipes (41) connected to the air inlet chamber (6). Air enters the air inlet gap (100) from the air inlet grille (11), and then enters the air inlet chamber (6) through the suction fan (7). The air in the air inlet chamber (6) enters the heat exchange pipes (41) of the heat exchange box (4) in sequence for heat exchange and then enters the hot air chamber (2), and finally exits from the hot air outlet (21); A hot air mixing chamber (9) is provided between two adjacent heat exchange boxes (4) and between the heat exchange box (4) and the hot air chamber (2). The heat exchange tubes (41) are arranged horizontally and the heat exchange tubes (41) on the two adjacent heat exchange boxes (4) are staggered.

2. The hot air furnace for fixing tea leaves as described in claim 1, characterized in that: The heat exchange box (4) is provided with a vertical partition (42), and a connecting port (44) is provided between the vertical partition (42) and the bottom of the heat exchange box (4). The vertical partition (42) divides the inner cavity of the heat exchange box (4) into flue gas channels (43) that are interconnected at the bottom. A flue gas channel (8) is provided between the top of the combustion chamber (3) and the top of the heat exchange box (4) and between the tops of two adjacent heat exchange boxes (4). The flue gas from the combustion chamber (3) enters the flue gas channel (43) on one side of the heat exchange box (4) through the flue gas channel (8) and then runs downwards. It enters the flue gas channel (43) on the other side through the connecting port (44) and then exits through the flue gas channel (8) at the top and enters the next heat exchange box (4).

3. The hot air furnace for fixing tea leaves as described in claim 1, characterized in that: The exhaust device (5) includes an exhaust fan (51) installed on the top of the heat exchange box (4) adjacent to the air inlet chamber (6); a vertical flue (52) is provided on the other side of the air inlet chamber (6) relative to the heat exchange box (4), and a flue gas connecting pipe (53) is provided between the vertical flue (52) and the outlet of the exhaust fan (51); a bottom flue (54) connected to the vertical flue (52) is provided at the bottom of the air inlet chamber (6), and a set of spaced exhaust pipes (55) is provided at one end of the bottom flue (54) near the heat exchange box (4), and an exhaust chimney (56) is connected above the exhaust pipes (55).

4. The hot air furnace for fixing tea leaves as described in claim 3, characterized in that: The width of the vertical flue (52) is adapted to the width of the side wall of the air inlet chamber (6), and the size of the bottom flue (54) is adapted to the bottom area of ​​the air inlet chamber (6).

5. The hot air furnace for fixing tea leaves as described in claim 3, characterized in that: On the side wall of the air inlet chamber (6) away from the heat exchange box (4), a set of air guide plates (61) are arranged from top to bottom. The air guide plates (61) are arranged horizontally and gradually lengthen from top to bottom.

6. The hot air furnace for fixing tea leaves as described in claim 1, characterized in that: The combustion chamber (3), heat exchange box (4) and bottom flue (54) are all provided with ash collection chambers (10), and the ports of the ash collection chambers (10) are provided with openable doors (101).

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