Device for changing positive pressure into negative pressure of biomass fuel hot blast stove

Abstract

The utility model discloses a device for changing positive pressure into negative pressure of a biomass fuel hot blast stove. According to the technical key points, a combustion chamber is arranged in the furnace body, and the combustion chamber is used for combusting fuel; the chimney is fixedly connected with the furnace body, communicates with the combustion chamber and is used for allowing combustion gas to leave the combustion chamber; the hopper is used for stacking fuel, and the hopper is connected with the furnace body through a pipeline; comprising an exhaust fan, the exhaust fan is arranged on a chimney, the exhaust fan guides combustion gas to leave a combustion chamber and the chimney in an accelerated mode, part of the fan is arranged on a furnace body and used for supplementing air to the combustion chamber, and the air supplementing amount of the air supplementing fan is smaller than the air exhausting amount of the exhaust fan so that negative pressure can be generated in the combustion chamber and the chimney. The positive pressure state in the combustion chamber of the biomass fuel hot blast stove can be changed into the negative pressure state, tobacco leaves are prevented from being on fire in the tobacco curing process, potential safety hazards are eliminated, and economic losses are avoided.

Description

Technical Field

[0001] This utility model relates to the field of tobacco curing equipment, and more specifically to a device for converting a biomass fuel hot air furnace from positive pressure to negative pressure. Background Technology

[0002] Current biomass fuel combustion furnaces are widely used due to their high efficiency and energy saving, reducing environmental pollution. When used as heating devices for tobacco curing, to ensure tobacco quality, the high-temperature flue gas generated during combustion is isolated through pipes. The circulating airflow in the tobacco curing barn exchanges heat with the pipes, carrying away heat for drying the tobacco. However, during long-term use, cracks and corrosion inevitably occur in the furnace body, rendering it incomplete. At this point, the combustion chamber inside the furnace is connected to the tobacco curing barn through these cracks. The combustion chamber is under positive pressure relative to the curing barn. The biomass burning in the combustion chamber leaves through the cracks under pressure and then enters the curing barn with the circulating airflow. The tobacco leaves in the curing barn are highly flammable after curing, and once ignited, it is difficult to extinguish, resulting in complete incineration of the tobacco leaves and damage to the curing barn, causing economic losses to the user.

[0003] The current remedy is to periodically repair the combustion furnace, which is time-consuming and labor-intensive, and cannot repair newly formed cracks in the furnace body during the tobacco curing process, thus always posing a safety hazard. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for converting a biomass fuel hot air furnace from positive pressure to negative pressure to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for converting a biomass fuel hot air furnace from positive pressure to negative pressure, comprising:

[0006] A furnace body, the furnace body having a combustion chamber inside, the combustion chamber being used to burn fuel;

[0007] A chimney, which is fixedly connected to the furnace body and communicates with the combustion chamber to allow combustion gases to leave the combustion chamber;

[0008] A hopper for storing fuel is connected to the furnace body via a feeding channel.

[0009] It includes an exhaust fan installed on the chimney, which guides the combustion gases to accelerate away from the combustion chamber and the chimney. It also includes a supplementary fan installed on the furnace body, which is used to supplement the combustion chamber with air. The supplementary fan's air volume is less than the exhaust fan's air volume, creating negative pressure in the combustion chamber and the chimney.

[0010] As a further improvement of this utility model, the power of the exhaust fan is adjustable, and the power of the auxiliary fan is adjustable.

[0011] As a further improvement of this utility model, the exhaust fan is installed at the top of the chimney.

[0012] As a further improvement of this utility model, the supplementary fan is positioned near the hopper.

[0013] As a further improvement of this utility model, the airflow blown by the auxiliary fan moves toward the chimney.

[0014] As a further improvement of this utility model, it also includes a control board, which is connected to the exhaust fan and the supplementary fan, and is used to control the power difference between the exhaust fan and the supplementary fan, thereby controlling the difference between the exhaust air volume and the supplementary air volume.

[0015] As a further improvement of this utility model, the exhaust fan includes an exhaust motor and an exhaust blade. The exhaust blade is connected to the exhaust motor and is located inside the chimney. An exhaust heat dissipation shroud is provided between the exhaust blade and the exhaust motor.

[0016] The beneficial effect of this utility model is that it changes the positive pressure state in the combustion chamber of the biomass fuel hot air furnace to a negative pressure state, preventing the tobacco leaves from catching fire during the flue-curing process, eliminating safety hazards, and avoiding economic losses. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a biomass fuel hot air furnace and a tobacco curing barn.

[0018] Marking descriptions: 1. Furnace body; 2. Combustion chamber; 3. Chimney; 4. Hopper; 5. Exhaust fan; 51. Exhaust motor; 52. Exhaust fan blade; 53. Exhaust heat dissipation cover; 6. Make-up fan; 7. Heat exchanger; 71. Heat dissipation pipe. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0020] Reference Figure 1 As shown, arrow A indicates the fuel feeding direction. This embodiment of a biomass fuel hot air furnace positive pressure to negative pressure conversion device includes:

[0021] Furnace body 1, wherein the furnace body 1 has a combustion chamber 2 inside, the combustion chamber 2 being used for burning fuel;

[0022] Chimney 3, which is fixedly connected to furnace body 1 and communicates with combustion chamber 2 to allow combustion gases to leave combustion chamber 2. A heat exchanger 7 is provided on chimney 3, and heat exchanger 7 has heat dissipation pipe 71 inside.

[0023] Hopper 4 is used to store fuel, and hopper 4 is connected to furnace body 1 through feeding channel;

[0024] It includes an exhaust fan 5, which is installed on the chimney 3. The exhaust fan 5 guides the combustion gas to accelerate away from the combustion chamber 2 and the chimney 3. It also includes a supplementary fan 6, which is installed on the furnace body 1 and is used to supplement the combustion chamber 2 with air. The supplementary air volume of the supplementary fan 6 is less than the exhaust air volume of the exhaust fan 5, so that negative pressure is generated in the combustion chamber 2 and the chimney 3.

[0025] Through the above technical solution, based on the existing biomass fuel combustion furnace, an exhaust fan 5 is installed at the chimney 3, and an induced draft fan is installed on the furnace body 1. When combustion occurs in the combustion chamber 2, the exhaust fan 5 and the supplementary fan 6 are activated. When the exhaust air volume is greater than the supplementary air volume, both the combustion chamber 2 and the chimney 3 are in a negative pressure state. By changing the positive pressure state in the combustion chamber 2 to a negative pressure state, the situation of sparks and flames shooting out from cracks and holes is avoided, eliminating safety hazards and improving safety. At the same time, the situation of tobacco leaf ignition is avoided, thus avoiding economic losses.

[0026] Specifically, heat exchanger 7 and heat dissipation pipe 71 are used to exchange heat with the circulating airflow in the drying room, and the heat exchange effect is good.

[0027] Specifically, by setting up exhaust fan 5 and auxiliary fan 6, the combustion gas flows rapidly within the chimney 3, heat exchanger 7, and radiator 71, thereby preventing dust accumulation within the radiator 71, reducing the frequency of dust cleaning, and facilitating operation. Furthermore, reduced dust accumulation ensures a smooth flow path for the combustion gas, better maintaining a negative pressure state in the combustion chamber 2, preventing the fuel in the feed channel and hopper 4 from being ignited, and eliminating safety hazards.

[0028] As one specific implementation of the improvement, the power of the exhaust fan 5 is adjustable, and the power of the auxiliary fan 6 is adjustable.

[0029] With the above technical solution, the power of exhaust fan 5 and auxiliary fan 6 can be adjusted. Different exhaust power and auxiliary air power can be set according to the size and number of cracks in furnace body 1, so that the combustion chamber 2 and chimney 3 are always in a negative pressure state. It is flexible in use and has a wide range of applications.

[0030] As one specific embodiment of the improvement, the exhaust fan 5 is located at the top of the chimney 3.

[0031] With the above technical solution, the exhaust fan 5 is installed at the top of the chimney 3 for easy installation.

[0032] Specifically, the exhaust fan 5 can also be installed in other locations on the chimney 3, depending on the actual situation of the chimney 3.

[0033] As one specific implementation of the improvement, the supplementary fan 6 is positioned near the side of the hopper 4.

[0034] With the above technical solution, the auxiliary fan 6 is set close to the side of the hopper 4, and the airflow moves from the side of the hopper 4 into the combustion chamber 2, preventing backfire from igniting the fuel in the fuel hopper through the feed channel, avoiding the fuel in the hopper 4 from being ignited, and further improving the safety during use.

[0035] As one specific implementation of the improvement, the airflow blown by the auxiliary fan 6 moves toward the chimney 3.

[0036] Through the above technical solution, the airflow blown by the auxiliary fan 6 moves towards the chimney 3, and works in conjunction with the exhaust fan 5 to increase the flow rate of the combustion gas. Even when the auxiliary fan 6 and the exhaust fan 5 are operating at low power, negative pressure can be formed in the combustion chamber 2 and the chimney 3 to prevent sparks from flying out and reduce energy consumption.

[0037] As an improved specific implementation, it also includes a control board, which is connected to the exhaust fan 5 and the supplementary fan 6, and is used to control the power difference between the exhaust fan 5 and the supplementary fan 6, thereby controlling the difference between the exhaust air volume and the supplementary air volume.

[0038] With the above technical solution, the power difference between exhaust fan 5 and make-up fan 6 can be controlled by the control board, thereby controlling the difference between exhaust air volume and make-up air volume. There is no need to control make-up fan 6 and exhaust fan 5 separately, which is convenient to use.

[0039] As an improved specific implementation, the exhaust fan 5 includes an exhaust motor 51 and an exhaust blade 52. The exhaust blade 52 is connected to the exhaust motor 51 and is located inside the chimney 3. An exhaust heat dissipation shroud 53 is provided between the exhaust blade 52 and the exhaust motor 51.

[0040] Through the above technical solution, the exhaust motor 51 and the exhaust blade 52 are extended, and an exhaust heat dissipation cover 53 is added to the extended part, which can effectively protect the exhaust motor 51, prevent it from overheating and burning out, extend its service life, and improve its stability during use.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A device for converting a biomass fuel hot air furnace from positive pressure to negative pressure, comprising: A furnace body (1) having a combustion chamber (2) inside, the combustion chamber (2) being used for burning fuel; Chimney (3), which is fixedly connected to furnace body (1) and communicates with combustion chamber (2) to allow combustion gases to leave combustion chamber (2); A hopper (4) is used to store fuel, and the hopper (4) is connected to the furnace body (1) through a feeding channel; Its features are: It includes an exhaust fan (5) installed on the chimney (3) to guide the combustion gas to accelerate away from the combustion chamber (2) and the chimney (3). It also includes a supplementary fan (6) installed on the furnace body (1) to supplement the combustion chamber (2). The supplementary fan (6) has a smaller air volume than the exhaust fan (5) to generate negative pressure in the combustion chamber (2) and the chimney (3).

2. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1, characterized in that: The power of the exhaust fan (5) is adjustable, and the power of the auxiliary fan (6) is adjustable.

3. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1 or 2, characterized in that: The exhaust fan (5) is located on top of the chimney (3).

4. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1 or 2, characterized in that: The auxiliary fan (6) is located on the side near the hopper (4).

5. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1 or 2, characterized in that: The airflow blown by the auxiliary fan (6) moves toward the chimney (3).

6. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1 or 2, characterized in that: It also includes a control board, which is connected to the exhaust fan (5) and the supplementary fan (6) to control the power difference between the exhaust fan (5) and the supplementary fan (6), thereby controlling the difference between the exhaust air volume and the supplementary air volume.

7. The biomass fuel hot air furnace positive pressure to negative pressure conversion device according to claim 1 or 2, characterized in that: The exhaust fan (5) includes an exhaust motor (51) and an exhaust blade (52). The exhaust blade (52) is connected to the exhaust motor (51). The exhaust blade (52) is located inside the chimney (3). An exhaust heat dissipation shroud (53) is provided between the exhaust blade (52) and the exhaust motor (51).

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