Energy-saving biomass combustion furnace

Abstract

The utility model provides a kind of energy-saving biomass combustion furnace, including shell, inner bag, bin door, lock bar, lock plate, the inner side of shell is fixedly connected with inner bag, the front of shell is movably connected with the bin door of inner bag, the front of bin door is fixedly connected with lock bar, the front of shell is fixedly connected with the lock plate with notch, the lock bar can be inserted into lock plate and then be fastened well with nut;The front of inner bag is fixedly connected with oxygen inlet, the rear end of inner bag is fixedly connected with a smoke outlet.The utility model has the advantages that: multiple arc heat exchange channels are arranged between inner bag and shell, which are expanded into strips, have large contact area with inner bag, can fully exchange heat, and cooperate with multiple heat evenly rods to fully heat evenly, more fully exchange heat with combustion source, its inside is filled with medium water, which is pumped away through water outlet after fully exchanging heat, compared with traditional heating tank, the furnace can more fully utilize biomass heat energy, with higher efficiency and more energy saving.

Description

Technical Field

[0001] This utility model relates to the field of combustion furnace technology, and in particular to an energy-saving biomass combustion furnace. Background Technology

[0002] Biomass energy, as an important renewable energy source, is characterized by its wide distribution, abundant resources, and low-carbon environmental friendliness. It utilizes biomass fuels such as wood pellets, straw, rice husks, fruit shells, and animal manure for combustion and heating, demonstrating significant application value in industrial drying, hot water preparation, and district heating. Biomass combustion furnaces are the key equipment for achieving this energy conversion.

[0003] Currently, most common biomass combustion furnaces utilize thermal energy by drawing inspiration from traditional boiler structures, with the core heating component typically being a relatively independent heating tank or boiler drum structure. The combustion process takes place within the inner tank (or furnace), and the generated heat heats the heat exchange medium (usually water) surrounding or passing through it via radiation and convection. While this structure is relatively mature, it suffers from the following significant technical drawbacks in practical applications: Low heat exchange efficiency: The heat exchange surfaces (such as tank walls) of traditional structures are relatively flat and limited, resulting in insufficient actual contact area with the hot inner liner (combustion source). This restricts the heat transfer rate and efficiency, making it impossible to fully utilize all the heat energy released by fuel combustion. A large amount of high-temperature flue gas is discharged without sufficient heat exchange, causing significant exhaust heat loss.

[0004] Poor heat uniformity: In traditional heating tank structures, the internal medium water mainly relies on natural convection for heat exchange, resulting in a significantly higher temperature of the medium near the tank wall (i.e., near the heat source) than that farther away. This uneven temperature distribution ("dead water" phenomenon) not only reduces overall heat exchange efficiency but also easily leads to the formation of hot spots in localized areas, exacerbating the risk of scaling or affecting equipment lifespan. Therefore, an energy-saving biomass combustion furnace is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0006] Therefore, one objective of this utility model is to propose an energy-saving biomass combustion furnace to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0007] To achieve the above objectives, one embodiment of the present invention provides an energy-saving biomass combustion furnace, comprising an outer shell, an inner liner, a bin door, a locking rod, and a locking plate. The inner liner is fixedly connected to the inner side of the outer shell, and the bin door of the inner liner is movably connected to the front side of the outer shell. The locking rod is fixedly connected to the front side of the bin door, and the locking plate with a notch is fixedly connected to the front side of the outer shell. The locking rod can be inserted into the locking plate and then fastened with a nut. An oxygen inlet is fixedly connected to the front of the inner liner, and a smoke exhaust port is fixedly connected to the rear of the inner liner. The outer casing is fixedly connected to two support legs on both sides; Several heat exchange channels are arranged between the outer shell and the inner liner, and the heat exchange channels are generally arc-shaped. The heat exchange channel is plate-shaped, with an inlet channel fixedly connected to the top end of the heat exchange channel and an outlet channel fixedly connected to the bottom end of the heat exchange channel. Several heat exchange rods are fixedly connected to the outer surface of the inner liner, and the heat exchange rods are connected to the heat exchange channels on the same side of the inner liner surface.

[0008] Preferably, in any of the above embodiments, an insulating shell of a certain material is attached to the outer surface of the outer shell, and the inner liner is welded to the outer shell.

[0009] The above technical solution is adopted: This device is a biomass combustion furnace, which is specially used to burn wood pellets, straw, rice husks, fruit shells and animal manure, and then heat the medium to utilize the combustion heat energy.

[0010] Biomass is burned in the inner liner, and then smoke is exhausted through the exhaust port and oxygen is introduced through the oxygen inlet.

[0011] Preferably, in any of the above embodiments, the locking rod is threaded, and the oxygen inlet passes through the front panel of the housing.

[0012] The core structure of the device using the above technical solution consists of an inner tank, an outer shell, heat exchange channels, a water inlet channel, a water outlet channel, and a heat exchanger. Multiple arc-shaped heat exchange channels are arranged between the inner tank and the outer shell, unfolding into strips with a large contact area with the inner tank, enabling thorough heat exchange. These channels, combined with multiple heat exchangers, ensure even heat distribution and facilitate more comprehensive heat exchange with the combustion source. The channels are filled with water, which is then pumped away through the water outlet channel after sufficient heat exchange. Compared to traditional heating tanks, this furnace can more fully utilize biomass thermal energy, resulting in higher efficiency and greater energy savings.

[0013] Preferably, the heat exchange channel is made of copper, and both the inlet and outlet channels pass through the wall of the outer shell.

[0014] The above technical solution comprises the following structural components: Outer shell: The outer shell, serving as the external protective casing, is made of high-temperature resistant steel plate. An insulation shell (made of a composite silicate insulation layer) is adhered to its outer surface to reduce heat loss. An inner liner is fixedly connected to the inner side of the outer shell, and the two are fixed together by welding to ensure structural stability. The front of the outer shell is designed to be openable, and support legs are fixedly connected to both sides. These support legs are used to support the entire device, ensuring stable placement on the ground.

[0015] Inner Tank: The inner tank, located inside the outer shell, is made of high-temperature resistant cast iron and is specifically designed to contain the combustion of biomass fuels (such as straw or wood pellets). An oxygen inlet is fixedly connected to the front of the inner tank, allowing air to be introduced to support combustion. This inlet passes through the front panel of the outer shell and is directly exposed to the external environment. An exhaust port is fixedly connected to the rear of the inner tank to discharge the flue gas produced during combustion. Several heat spreaders (preferably one) are fixedly connected to the outer surface of the inner tank. These heat spreaders are made of copper tubing, horizontally welded to the outer surface of the inner tank, and connected to heat exchange channels on the same side of the inner tank surface to conduct and evenly distribute heat.

[0016] Door, locking lever, and locking plate: A door is movably connected to the front of the outer casing, used to open or close the fuel filler port of the inner tank. A locking lever with a threaded design is fixedly connected to the front of the door for easy tightening. A notched locking plate (made of steel) is fixedly connected to the front of the outer casing; the locking lever can be inserted into the notch of the locking plate and then tightened with a nut to ensure the door is securely locked during combustion.

[0017] Heat exchange system: Several heat exchange channels (preferably one) are arranged in the gap between the outer shell and the inner liner. The heat exchange channels have an overall arc-shaped structure and a plate-like design, made of copper to enhance heat transfer efficiency. When the heat exchange channels are unfolded, their shape becomes strip-like, with a larger surface area, increasing the contact area with the inner liner by more than 50%. A water inlet is fixedly connected to the top of the heat exchange channel for introducing cold medium water; a water outlet is fixedly connected to the bottom of the heat exchange channel for discharging heated hot water. Both the water inlet and outlet channels pass through the wall of the outer shell and are fixed to the outer shell by a sealed welding method to ensure no leakage. This heat exchange channel is connected to the heat spreader to form a comprehensive heat transfer network.

[0018] Support legs: The support legs are fixedly connected to both sides of the outer casing and are height-adjustable supports, making it easy to place the equipment on uneven ground.

[0019] Preferably, the water outlet and water inlet are sealed and welded to the outer shell, as described in any of the above schemes.

[0020] Preferably, in any of the above embodiments, the heat spreader is welded to the outer surface of the inner liner, the heat spreader is a copper tube, and the heat spreader is installed horizontally.

[0021] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: This energy-saving biomass combustion furnace, through the coordinated arrangement of an inner liner, outer shell, heat exchange channels, water inlet channel, water outlet channel, and heat spreader, features multiple arc-shaped heat exchange channels between the inner liner and outer shell. These channels unfold into strips, providing a large contact area with the inner liner for thorough heat exchange. Combined with multiple heat spreaders, this ensures even heat distribution and more comprehensive heat exchange with the combustion source. The furnace contains water, which is then pumped away through the water outlet channel after sufficient heat exchange. Compared to traditional heating tanks, this furnace can more fully utilize biomass thermal energy, resulting in higher efficiency and greater energy savings.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective; Figure 4 This is a partial structural diagram of the inner liner of this utility model.

[0024] In the diagram: 1-outer shell, 2-inner liner, 3-door, 4-locking rod, 5-locking plate, 6-oxygen inlet, 7-smoke outlet, 8-support leg, 9-heat exchange channel, 10-water inlet channel, 11-water outlet channel, 12-heat spreader. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figure 1-4 As shown, this energy-saving biomass combustion furnace includes an outer shell 1, an inner liner 2, a bin door 3, a locking rod 4, and a locking plate 5. The inner liner 2 is fixedly connected to the inside of the outer shell 1, and the bin door 3 of the inner liner 2 is movably connected to the front of the outer shell 1. The locking rod 4 is fixedly connected to the front of the bin door 3, and the locking plate 5 with a notch is fixedly connected to the front of the outer shell 1. The locking rod 4 can be inserted into the locking plate 5 and then fastened with a nut. An oxygen inlet 6 is fixedly connected to the front of the inner liner 2, and a smoke exhaust outlet 7 is fixedly connected to the rear of the inner liner 2. Support legs 8 are fixedly connected to both sides of the outer casing 1; Several heat exchange channels 9 are arranged between the outer shell 1 and the inner liner 2, and the heat exchange channels 9 are arc-shaped in general. The heat exchange channel 9 is plate-shaped, with an inlet channel 10 fixedly connected to the top end of the heat exchange channel 9 and an outlet channel 11 fixedly connected to the bottom end of the heat exchange channel 9. Several heat exchange rods 12 are fixedly connected to the outer surface of the inner liner 2, and the heat exchange rods 12 are connected to the heat exchange channel 9 on the same side of the surface of the inner liner 2.

[0028] Example 1: An insulating shell of a certain material is attached to the outer surface of the outer shell 1, and the inner liner 2 is welded to the outer shell 1. The locking rod 4 is threaded, and the oxygen inlet 6 passes through the front panel of the outer shell 1.

[0029] The heat exchange channel 9 is made of copper. The inlet channel 10 and outlet channel 11 both pass through the wall of the outer shell 1. The outlet channel 11 and inlet channel 10 are sealed and welded to the outer shell 1. The heat spreader 12 is welded to the outer surface of the inner tank 2. The heat spreader 12 is a copper tube and is installed horizontally.

[0030] Example 2: This device is a biomass combustion furnace, specifically designed for burning wood pellets, straw, rice husks, fruit shells, and animal manure. The medium is then heated to utilize the combustion heat energy. Biomass is burned in the inner liner 2, and then exhausts through the flue vent 7 while oxygen is introduced through the oxygen inlet 6.

[0031] Device Structure: Outer Shell 1: The outer shell 1 serves as the external protective casing, made of high-temperature resistant steel plate. An insulation shell (made of composite silicate insulation layer) is adhered to its outer surface to reduce heat loss. The inner liner 2 is fixedly connected to the inner side of the outer shell 1, and the two are fixedly welded together to ensure structural stability. The front of the outer shell 1 is designed to be openable, and support legs 8 are fixedly connected to both sides. These support legs 8 are used to support the entire device, ensuring stable placement on the ground.

[0032] Inner liner 2: The inner liner 2 is located inside the outer shell 1 and is made of high-temperature resistant cast iron. It is specifically designed to contain biomass fuels (such as straw or wood pellets) for combustion. An oxygen inlet 6 is fixedly connected to the front of the inner liner 2. This inlet 6 is used to introduce air to support combustion and passes through the front panel of the outer shell 1, directly exposing it to the external environment. A flue vent 7 is fixedly connected to the rear of the inner liner 2 to discharge the flue gas produced during combustion. Several heat spreaders 12 (preferably 8-12) are fixedly connected to the outer surface of the inner liner 2. The heat spreaders 12 are made of copper tubing, horizontally welded to the outer surface of the inner liner 2, and connected to the heat exchange channel 9 on the same side of the inner liner 2 surface to conduct and evenly distribute heat.

[0033] Door 3, locking rod 4, and locking plate 5: Door 3 is movably connected to the front of the outer shell 1. This door 3 is used to open or close the fuel filling port of the inner liner 2. Locking rod 4 is fixedly connected to the front of door 3. This locking rod 4 has a threaded design for easy tightening. Locking plate 5 (made of steel) with a notch is fixedly connected to the front of the outer shell 1. Locking rod 4 can be inserted into the notch of locking plate 5 and then tightened with a nut to ensure that door 3 is safely locked during combustion.

[0034] Heat exchange system: Several heat exchange channels 9 (preferably 6-10) are arranged in the gap between the outer shell 1 and the inner liner 2. The heat exchange channels 9 have an overall arc-shaped structure, a sheet-like design, and are made of copper to enhance heat transfer efficiency. When the heat exchange channels 9 are unfolded, their shape becomes strip-shaped, with a larger surface area, increasing the contact area with the inner liner 2 by more than 50%. A water inlet channel 10 is fixedly connected to the top of the heat exchange channel 9 for introducing cold medium water; a water outlet channel 11 is fixedly connected to the bottom of the heat exchange channel 9 for discharging heated hot water. Both the water inlet channel 10 and the water outlet channel 11 pass through the wall of the outer shell 1 and are fixed to the outer shell 1 by a sealed welding method to ensure no leakage. This heat exchange channel 9 is connected to the heat spreader 12, forming a comprehensive heat transfer network.

[0035] Support legs 8: Support legs 8 are fixedly connected to both sides of the outer casing 1 and are height-adjustable supports, making it easy to place the equipment on uneven ground.

[0036] The working principle of this utility model is as follows: Fuel Combustion Stage: The user loads biomass fuel (such as wood pellets, straw, nutshells, or animal manure) into the inner liner 2 by opening the compartment door 3. After closing the compartment door 3, the locking rod 4 is engaged with the notch in the locking plate 5 and tightened with a nut to ensure a sealed combustion chamber. After ignition, the fuel undergoes complete combustion within the inner liner 2. During combustion, external air is introduced through the oxygen inlet 6 to provide continuous oxygen support for combustion and prevent incomplete combustion from producing smoke and dust. The heat generated by combustion accumulates inside the inner liner 2, reaching temperatures of 600-800℃.

[0037] Heat conduction and heat equalization stage: The heat equalization rod 12 (made of copper tube) on the outer surface of the inner liner 2 directly absorbs heat from the combustion source. Because the heat equalization rod 12 is horizontally welded to the surface of the inner liner 2 and extends into the heat exchange channel 9 area, the heat is rapidly and evenly distributed to the entire surface of the inner liner 2 and the adjacent heat exchange channel 9 through the high thermal conductivity of the copper tube. This avoids the local overheating phenomenon in traditional designs and ensures a balanced heat distribution.

[0038] Medium water heat exchange stage: Medium water (such as the working fluid of a circulating water system) is introduced into the heat exchange channel 9 through the inlet channel 10. The arc-shaped strip structure of the heat exchange channel 9 is in close contact with the inner tank 2, with a large contact area, and the heat exchange is further amplified through the heat conduction of the heat spreader 12. When the water flows in the heat exchange channel 9, it fully absorbs the heat energy released by the inner tank 2. Water flows from the inlet channel 10 into the top of the arc-shaped heat exchange channel 9 and flows downwards step by step.

[0039] The copper material of heat exchange channel 9 rapidly conducts heat, raising the water temperature.

[0040] At the bottom, the heated water (temperatures can reach 80-95℃) is pumped away through the outlet 11 for use in heating or industrial processes.

[0041] Heat recovery and emission stage: The flue gas generated during combustion is discharged through the exhaust port 7. As the flue gas flows through the heat exchange channel 9, the waste heat is reused (through indirect conduction on the surface of the heat exchange channel 9), reducing heat loss. The insulation shell on the surface of the outer shell 1 further isolates heat loss, ensuring that the heat energy is concentrated in the heat exchange system. Compared with the single water jacket of the traditional heating tank structure, this design improves the thermal efficiency by more than 30% through multi-point heat transfer in the heat exchange channel 9 and the assistance of the heat spreader 12, and the thermal energy utilization rate of biomass fuel exceeds 85%.

[0042] Energy saving and efficiency advantages: The entire process fully utilizes the large-area contact of the arc-shaped heat exchange channel 9 and the temperature uniformity of the heat exchange rod 12, extending the residence time of the medium water in the heat exchange channel 9 and absorbing more heat energy. The water is efficiently recovered through the outlet channel 11, reducing the flue gas emission temperature (to approximately below 100°C), achieving the energy-saving effect of "full heat exchange and low loss".

[0043] Compared with the prior art, the present invention has the following advantages: Multiple arc-shaped heat exchange channels 9 are arranged between the inner liner 2 and the outer shell 1. These channels unfold into strips and have a large contact area with the inner liner 2, enabling sufficient heat exchange. They are also combined with multiple heat spreaders 12 to ensure even heat distribution and more thorough heat exchange with the combustion source. The channels are filled with water, which is pumped away through the outlet channel 11 after sufficient heat exchange. Compared with traditional heating tanks, this furnace can make fuller use of biomass thermal energy, resulting in higher efficiency and greater energy savings.

Claims

1. An energy-saving biomass combustion furnace, characterized in that, Includes an outer shell (1), an inner liner (2), a door (3), a locking rod (4), and a locking plate (5). The inner liner (2) is fixedly connected to the inner side of the outer shell (1). The door (3) of the inner liner (2) is movably connected to the front of the outer shell (1). The locking rod (4) is fixedly connected to the front of the door (3). The locking plate (5) with a notch is fixedly connected to the front of the outer shell (1). The locking rod (4) can be inserted into the locking plate (5) and then tightened with a nut. An oxygen inlet (6) is fixedly connected to the front of the inner liner (2), and a smoke exhaust port (7) is fixedly connected to the rear end of the inner liner (2). The outer shell (1) is fixedly connected to two sides with support legs (8); Several heat exchange channels (9) are arranged between the outer shell (1) and the inner liner (2), and the heat exchange channels (9) are generally arc-shaped. The heat exchange channel (9) is plate-shaped, with an inlet channel (10) fixedly connected to the top end of the heat exchange channel (9) and an outlet channel (11) fixedly connected to the bottom end of the heat exchange channel (9). Several heat exchange rods (12) are fixedly connected to the outer surface of the inner liner (2), and the heat exchange rods (12) are connected to the heat exchange channel (9) on the same side of the surface of the inner liner (2).

2. The energy-saving biomass combustion furnace as described in claim 1, characterized in that: An insulating shell of a certain material is pasted on the outer surface of the outer shell (1), and the inner liner (2) is welded to the outer shell (1).

3. The energy-saving biomass combustion furnace as described in claim 2, characterized in that: The locking rod (4) is threaded, and the oxygen inlet (6) passes through the front panel of the outer casing (1).

4. An energy-saving biomass combustion furnace as described in claim 3, characterized in that: The heat exchange channel (9) is made of copper, and the water inlet channel (10) and water outlet channel (11) both pass through the wall of the outer shell (1).

5. An energy-saving biomass combustion furnace as described in claim 4, characterized in that: The water outlet (11) and water inlet (10) are sealed and welded to the outer shell (1).

6. The energy-saving biomass combustion furnace as described in claim 5, characterized in that: The heat spreader (12) is welded to the outer surface of the inner liner (2). The heat spreader (12) is a copper tube and is installed horizontally.

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