An energy-saving hot air furnace for pellet drying

Abstract

This utility model relates to the technical field of pellet drying equipment, specifically to an energy-saving hot air furnace for pellet drying, comprising: a furnace body, a burner, a preheating mechanism, and a waste heat recovery device. The preheating mechanism includes a gas preheating device and an air preheating device. The gas preheating device includes a gas supply pipe, with its input end connected to the gas supply device and its output end connected to the gas inlet of the burner. A flow regulating valve is fixedly connected to the top of the gas supply pipe. The air preheating device includes an air supply pipe, with a combustion air fan fixedly connected to its input end and its output end connected to the combustion air inlet of the burner. Through the preheating mechanism, the gas preheating device and the air preheating device preheat the gas and combustion air during use, reducing the heating load of the burner and reducing fuel consumption. At the same time, the waste heat recovery device effectively recovers the waste heat from the flue gas, increasing the overall thermal efficiency of the system to over 75%.

Description

Technical Field

[0001] This utility model relates to the technical field of pellet drying equipment, specifically to an energy-saving hot air furnace for pellet drying. Background Technology

[0002] Drying is a key step in the pellet production process, and hot air furnaces are usually used to provide heat for drying.

[0003] When traditional hot air furnaces are in operation, combustion air and gas are directly introduced into the burner, requiring a large amount of fuel to heat them to the combustion temperature; at the same time, the flue gas produced after combustion carries a large amount of heat and is directly emitted, resulting in serious energy waste. The thermal efficiency is usually only 50%-60%, and the energy cost is high.

[0004] In addition, the airflow inside the traditional combustion chamber is slow, the gas and air are not mixed sufficiently, and the combustion efficiency is low, which further increases energy consumption. Therefore, it is of great significance to develop an energy-saving hot air furnace that can effectively recover waste heat and improve combustion efficiency. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an energy-saving hot air furnace for pellet drying, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides an energy-saving hot air furnace for pellet drying, including: a furnace body, a burner, a preheating mechanism, and a waste heat recovery device. The preheating mechanism includes a gas preheating device and an air preheating device. The gas preheating device includes a gas supply pipe, the input end of which is connected to the gas supply device, and the output end of which is connected to the gas inlet of the burner. A flow regulating valve is fixedly connected to the top end of the gas supply pipe. The air preheating device includes an air supply pipe, the input end of which is fixedly connected to a combustion-supporting fan, and the output end of which is connected to the combustion-supporting air inlet of the burner.

[0007] Furthermore, a base is fixedly connected to the bottom of the furnace body, and a hot air inlet is opened at one end of the furnace body, which is connected to the burner.

[0008] Furthermore, a hot air outlet is fixedly connected to one side of the other end of the furnace body, and several baffles are evenly fixedly connected to the inner wall of the furnace body. The hot air outlet is connected to the pellet dryer, and a temperature sensor is fixedly connected inside the hot air outlet.

[0009] Furthermore, an insulation layer is provided in the middle of the furnace body, and a flue is fixedly connected to the top of the furnace body. A waste heat recovery device is provided at the top of the flue.

[0010] Furthermore, the waste heat recovery device includes a waste heat exchanger, which is fixedly connected to the top of the flue gas outlet. A flue gas pipe is fixedly connected to the top of the waste heat exchanger, and a rain shield is fixedly connected to the top of the flue gas pipe.

[0011] Furthermore, a cold air inlet is fixedly connected to one side of the waste heat exchanger, and an induced draft fan is fixedly connected to the other side of the waste heat exchanger.

[0012] Furthermore, the exhaust outlet of the induced draft fan is divided into two paths, which are connected to the gas supply pipe and the air supply pipe respectively.

[0013] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. Through the preheating mechanism, the gas preheating device and air preheating device preheat the gas and combustion air during use, reducing the heating load of the burner and reducing fuel consumption. At the same time, the waste heat recovery device effectively recovers the waste heat of the flue gas, increasing the overall thermal efficiency of the system to over 75%. The preheated gas and air mix more thoroughly, and together with the baffles in the furnace body to enhance the turbulence effect, the combustion efficiency is increased by 10%-15%, reducing energy waste and pollutant emissions caused by incomplete combustion; 2. A temperature sensor is installed at the hot air outlet to monitor and link with the flow regulating valve in real time, accurately control the gas supply, avoid overheating and energy loss, adapt to the temperature requirements of different drying stages, integrate preheating, combustion and waste heat recovery modules, the insulation layer reduces heat dissipation from the furnace body, and the rain shield design improves the environmental adaptability of the equipment, making it suitable for long-term stable operation of pellet drying production lines. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the furnace body of this utility model; Figure 3 This is a schematic diagram of the waste heat recovery device of this utility model; Figure 4 This is a schematic diagram of the preheating mechanism of this utility model.

[0016] The labels in the diagram represent: 1. Base; 2. Furnace body; 201. Hot air inlet; 202. Smoke outlet; 203. Hot air outlet; 204. Insulation layer; 205. Baffle plate; 3. Temperature sensor; 4. Burner; 5. Preheating mechanism; 501. Gas preheating device; 5011. Gas supply pipe; 5012. Flow regulating valve; 502. Air preheating device; 5021. Air supply pipe; 5022. Combustion fan; 6. Waste heat recovery device; 601. Waste heat exchanger; 602. Cold air inlet; 603. Exhaust fan; 604. Smoke pipe; 605. Rain shield. Detailed Implementation

[0017] 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.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Example 1: Reference Figure 1-4 This first embodiment of the present invention discloses an energy-saving hot air furnace for pellet drying, comprising: a furnace body 2, a burner 4, a preheating mechanism 5, and a waste heat recovery device 6. The preheating mechanism 5 includes a gas preheating device 501 and an air preheating device 502. The gas preheating device 501 includes a gas supply pipe 5011, the input end of which is externally connected to a gas supply device, and the output end of which is connected to the gas inlet of the burner 4. A flow regulating valve 5012 is fixedly connected to the top end of the gas supply pipe 5011. The air preheating device 502 includes an air supply pipe 5021, the input end of which is fixedly connected to a combustion-supporting fan 5022, and the output end of which is connected to the combustion-supporting air inlet of the burner 4.

[0020] With the preheating mechanism 5 in place, the gas preheating device 501 and the air preheating device 502 preheat the gas and combustion air during use, reducing the heating load of the burner 4 and reducing fuel consumption. At the same time, the waste heat recovery device 6 effectively recovers the waste heat of the flue gas, increasing the overall thermal efficiency of the system to over 75%. The preheated gas and air mix more thoroughly, and together with the baffle 205 inside the furnace body 2 to enhance the turbulence effect, the combustion efficiency is increased by 10%-15%, reducing energy waste and pollutant emissions caused by incomplete combustion.

[0021] Example 2: Reference Figure 1-4 This is the second embodiment of the present invention, which differs from the first embodiment in that: A base 1 is fixedly connected to the bottom of the furnace body 2. A hot air inlet 201 is opened at one end of the furnace body 2, and the hot air inlet 201 is connected to the burner 4. A hot air outlet 203 is fixedly connected to one side of the other end of the furnace body 2. Several baffles 205 are evenly fixedly connected to the inner wall of the furnace body 2. The hot air outlet 203 is connected to the pellet dryer. A temperature sensor 3 is fixedly connected inside the hot air outlet 203. An insulation layer 204 is provided in the middle of the furnace body 2. A flue gas outlet 202 is fixedly connected to the top of the furnace body 2. A waste heat recovery device 6 is provided at the top of the flue gas outlet 202.

[0022] The waste heat recovery device 6 includes a waste heat exchanger 601, which is fixedly connected to the top of the flue gas outlet 202. A flue gas pipe 604 is fixedly connected to the top of the waste heat exchanger 601, and a rain shield 605 is fixedly connected to the top of the flue gas pipe 604. A cold air inlet 602 is fixedly connected to one side of the waste heat exchanger 601, and an induced draft fan 603 is fixedly connected to the other side of the waste heat exchanger 601. The air outlet of the induced draft fan 603 is divided into two paths, which are respectively connected to the gas supply pipe 5011 and the air supply pipe 5021.

[0023] The hot air outlet 203 is equipped with a temperature sensor 3, which monitors and links with the flow regulating valve 5012 in real time to accurately control the gas supply, avoid overheating and energy loss, adapt to the temperature requirements of different drying stages, integrate preheating, combustion and waste heat recovery modules, the insulation layer 204 reduces heat dissipation of the furnace body 2, and the rain shield 605 is designed to improve the environmental adaptability of the equipment, making it suitable for long-term stable operation of the pellet drying production line.

[0024] The remaining structure is the same as that in Example 1.

[0025] The workflow of this utility model is as follows: First, the combustion fan 5022 sends air into the air supply pipe 5021, and the gas supply pipe 5011 is connected to an external gas source. Both are preheated by the waste heat exchanger 601. The induced draft fan 603 draws the hot air heated by the waste heat exchanger 601 and distributes it to the gas and air pipelines to ensure uniform preheating temperature. With the setting of the preheating mechanism 5, the gas preheating device 501 and the air preheating device 502 preheat the gas and combustion air during use, reducing the heating load of the burner 4 and reducing fuel consumption. At the same time, the waste heat recovery device 6 effectively recovers the waste heat of the flue gas, so that the overall thermal efficiency of the system is increased to more than 75%. The preheated gas and air are mixed more thoroughly. Combined with the baffle 205 in the furnace body 2 to enhance the turbulence effect, the combustion efficiency is increased by 10%-15%, reducing energy waste and pollutant emissions caused by incomplete combustion. Secondly, the preheated gas and air enter the burner 4 for thorough mixing and combustion. The high-temperature flue gas enters the furnace body 2 from the hot air inlet 201. The baffle 205 disrupts the flow direction of the flue gas, prolongs the residence time, and improves the heat exchange efficiency. After being insulated by the insulation layer 204, the hot air is delivered to the dryer from the hot air outlet 203. The temperature sensor 3 provides real-time feedback data and regulates the gas flow through the flow regulating valve 5012. The temperature sensor 3 is installed at the hot air outlet 203 to monitor and link the flow regulating valve 5012 in real time, accurately control the gas supply, avoid overheating and energy loss, adapt to the temperature requirements of different drying stages, and integrate preheating, combustion, and waste heat recovery modules. The insulation layer 204 reduces heat dissipation from the furnace body 2, and the rain shield 605 design improves the environmental adaptability of the equipment, making it suitable for long-term stable operation of the pellet drying production line. Finally, the flue gas enters the waste heat exchanger 601 through the exhaust port 202, where it exchanges heat with the cold air drawn in through the cold air inlet 602 in the opposite direction. After cooling down, it is discharged through the exhaust pipe 604. The recovered heat is used again to preheat the gas and air, forming a closed-loop energy-saving system. The exhaust temperature drops below 120°C, maximizing energy utilization. After the burner 4 is turned off, the induced draft fan 603 runs delayed until the furnace body 2 is cooled down to avoid waste of waste heat. The flow regulating valve 5012 automatically cuts off the gas supply to ensure safety.

[0026] 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. An energy-saving hot air furnace for pellet drying, characterized in that, include: The furnace body (2), burner (4), preheating mechanism (5) and waste heat recovery device (6) are provided. The preheating mechanism (5) includes a gas preheating device (501) and an air preheating device (502). The gas preheating device (501) includes a gas supply pipe (5011). The input end of the gas supply pipe (5011) is connected to a gas supply device. The output end of the gas supply pipe (5011) is connected to the gas inlet of the burner (4). A flow regulating valve (5012) is fixedly connected to the top end of the gas supply pipe (5011). The air preheating device (502) includes an air supply pipe (5021). The input end of the air supply pipe (5021) is fixedly connected to a combustion air fan (5022). The output end of the air supply pipe (5021) is connected to the combustion air inlet of the burner (4).

2. The energy-saving hot air furnace for pellet drying according to claim 1, characterized in that, The bottom end of the furnace body (2) is fixedly connected to the base (1), and a hot air inlet (201) is provided at one end of the furnace body (2). The hot air inlet (201) is connected to the burner (4).

3. The energy-saving hot air furnace for pellet drying according to claim 1, characterized in that, A hot air outlet (203) is fixedly connected to one side of the other end of the furnace body (2). Several baffles (205) are evenly fixedly connected to the inner wall of the furnace body (2). The hot air outlet (203) is connected to the pellet dryer. A temperature sensor (3) is fixedly connected inside the hot air outlet (203).

4. The energy-saving hot air furnace for pellet drying according to claim 1, characterized in that, The furnace body (2) is provided with a heat insulation layer (204) in the middle, and a flue gas outlet (202) is fixedly connected to the top of the furnace body (2). A waste heat recovery device (6) is provided at the top of the flue gas outlet (202).

5. The energy-saving hot air furnace for pellet drying according to claim 4, characterized in that, The waste heat recovery device (6) includes a waste heat exchanger (601), which is fixedly connected to the top of the flue gas outlet (202). A flue gas pipe (604) is fixedly connected to the top of the waste heat exchanger (601), and a rain shield (605) is fixedly connected to the top of the flue gas pipe (604).

6. The energy-saving hot air furnace for pellet drying according to claim 5, characterized in that, A cold air inlet (602) is fixedly connected to one side of the waste heat exchanger (601), and an induced draft fan (603) is fixedly connected to the other side of the waste heat exchanger (601).

7. The energy-saving hot air furnace for pellet drying according to claim 6, characterized in that, The exhaust port of the induced draft fan (603) is divided into two paths, which are connected to the gas supply pipe (5011) and the air supply pipe (5021) respectively.

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