A civilian biomass stove

Abstract

The present application belongs to the technical field of stove, and particularly relates to a domestic biomass stove. The domestic biomass stove comprises a shell body and a combustion chamber in the shell body. The combustion chamber comprises a cylinder body, and the upper part of the cylinder body is provided with a smoke outlet. The cylinder body is provided with a slit-type burner. The top of the slit-type burner is closed, the bottom is open, and a plurality of through holes are arranged on the outer wall of the slit-type burner. A plurality of baffles are arranged in the slit-type burner along the height direction. One side of the cylinder body is provided with an upper smoke box and a lower smoke box. The upper smoke box and the lower smoke box are connected through a convection tube bundle arranged between the two. The upper smoke box is connected with the smoke outlet, and the lower smoke box is provided with an air outlet. The shell body, the convection tube bundle, the upper smoke box and the lower smoke box form a heating water cavity, the cylinder body and the shell body form a cooling water cavity, and the cooling water cavity and the heating water cavity are connected. The present application effectively inhibits slagging and coking in the biomass combustion process, so that farmers can use cheap fuel for winter heating.

Description

Technical Field

[0001] The invention belongs to the technical field of stoves, and in particular relates to a civilian biomass stove. Background Art

[0002] Biomass has the advantages of low sulfur, low ash, carbon neutrality, low price and wide distribution. It is particularly suitable for civilian heating and cooking in winter in rural areas where natural gas pipelines are difficult to reach. Therefore, it has been increasingly promoted in rural areas.

[0003] Currently, civilian biomass stoves are categorized into various types based on their feed method and combustion principle. For example, they can be divided into auger-fed and gravity-fed types, and into air-heated and water-heated types based on heating methods. However, regardless of the type of stove, they all suffer from common problems, including slagging and coking, excessively picky requirements for fuel type and quality, low feed system reliability, and high pollutant emissions. Summary of the Invention

[0004] The purpose of the present invention is to provide a civilian biomass stove that effectively solves the problems of existing biomass stoves, such as easy slagging / coking, excessive pickiness about fuel type and quality, low reliability of the feeding system, and high pollutant emission concentration.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A civilian biomass stove comprises a shell body and a combustion chamber located in the shell body, wherein an ash chamber is provided below the combustion chamber.

[0007] The combustion chamber includes a cylinder, a feed port and a movable cover for covering the feed port are provided on the top of the cylinder, a smoke exhaust port is provided on the upper part of the cylinder, a retractable grate is provided on the bottom of the cylinder, and a plurality of slot burners are provided in the cylinder.

[0008] The slot burner has a closed top and an open bottom, a plurality of through holes are provided on the outer wall of the slot burner, and a plurality of deflectors for increasing air flow resistance are provided inside the slot burner at intervals along the height direction of the slot burner.

[0009] The top of at least one slot-type burner is flush with the bottom tangent line of the smoke exhaust port, and the bottom of at least one slot-type burner is flush with the bottom of the cylinder.

[0010] An upper smoke box is provided on one side of the upper part of the cylinder, and the upper smoke box is connected to the smoke exhaust port. A lower smoke box is provided below the upper smoke box, and the upper and lower smoke boxes are connected via a convection tube bundle located therebetween. An air outlet is provided on the lower smoke box, and the air outlet is connected to the smoke outlet pipe.

[0011] The upper smoke box, the lower smoke box and the convection tube bundle are located in the shell body, the inner wall of the shell body and the outer wall of the convection tube bundle, the upper smoke box and the lower smoke box form a heating water cavity, and a water outlet is arranged on the shell body outside the heating water cavity.

[0012] The outer wall of the cylinder and the inner wall of the shell body form a cooling water cavity, a water inlet is arranged on the shell body outside the cooling water cavity, and the cooling water cavity and the heating water cavity are connected.

[0013] Further, the slit burner further has a support rib, a metal mesh and a top plate located at the top, one end of the support rib is fixed to the outer edge of the top plate, the other end of the support rib extends downward to the bottom of the slit burner, and the metal mesh is arranged around the periphery of the support rib.

[0014] Further, the slit burner further has a support rib, a metal mesh, a perforated plate and a top plate located at the top, one end of the support rib is fixed to the outer edge of the top plate, the other end of the support rib extends downward to the bottom of the slit burner, the metal mesh is arranged around the periphery of the support rib, and the perforated plate is arranged around the inner periphery of the support rib.

[0015] Further, the slit burner includes one or more of a center burner, a corner burner and a general burner, the center burner is arranged in the cylinder, the general burner is arranged on the inner wall of the cylinder, and the corner burner is arranged at the included angle of the inner wall of the cylinder.

[0016] Further, the center burner is arranged at the center position in the cylinder, the cross section of the top plate of the center burner is circular or polygonal, the cross section of the top plate of the general burner and the corner burner is approximately sector or polygonal, and the two side edges of the top plate of the general burner and the corner burner match the inner wall surface of the cylinder.

[0017] Further, the ash chamber is provided with an ash drawer for collecting furnace ash, the ash drawer is located below the grate, and a furnace door is arranged on the outer side of the ash drawer, so that the ash drawer can be freely pulled out when the furnace door is opened.

[0018] Further, one side of the ash chamber is provided with a blower for feeding air into the slit burner.

[0019] Further, the top plate of the general burner or the corner burner is provided with an ignition rod for igniting fuel in the cylinder.

[0020] Further, the support rib is a round steel rib or a metal plate, and the metal mesh is a high-temperature-resistant stainless steel mesh.

[0021] Further, the water inlet is arranged at the lower part of the cooling water cavity, and the water outlet is arranged at the upper part of the heating water cavity.

[0022] The present application has the following advantages:

[0023] (1) By using the combination of the combustion chamber, the cooling water cavity and the slit burner, the average temperature of the whole combustion process is effectively reduced, and the slagging and coking in the biomass combustion process are inhibited.

[0024] (2) By using the slit burner with the baffle, the emission of pollutants such as fly ash particles, nitrogen oxides and sulfur dioxide is effectively reduced.

[0025] (3) By using the large hearth storage type combustion chamber, the biomass fuel is loaded into the water-cooled combustion chamber at one time through the feeding port, thereby improving the feeding reliability. In addition, the problem of easy coking of biomass fuel is completely solved, so that various sizes and types of biomass fuel can be burned. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in combination with the drawings and specific embodiments.

[0027] Figure 1 is the front perspective view of the present application.

[0028] Figure 2 is the top perspective view of the present application.

[0029] Figure 3 is Figure 2 the perspective structural schematic view of the central burner (part).

[0030] Figure 4 is Figure 2 the perspective structural schematic view of the corner burner.

[0031] Figure 5 is Figure 2 the perspective structural schematic view of the ordinary burner. DETAILED DESCRIPTION

[0032] As Figure 1 shown, a civil biomass stove comprises a shell body 1 and a combustion chamber 2 located in the shell body 1, and a dust chamber 3 is arranged below the combustion chamber 2.

[0033] The combustion chamber 2 comprises a cylinder 21, the top of which is provided with a feeding port and a movable cover plate 22 for covering the feeding port, the upper part of the cylinder is provided with a smoke outlet 23, the bottom of the cylinder is provided with a pullable grate 24, and a plurality of slit burners 25 are fitted in the cylinder.

[0034] The top of the slit burner 25 is closed and the bottom is open, a plurality of through holes are arranged on the outer wall of the slit burner 25, and the inside of the slit burner 25 is provided with a plurality of air inlets 252.

[0035] A plurality of baffles 251 for increasing air flow resistance are arranged in the height direction of the slit burner 25.

[0036] The top of at least one slit burner 25 is flush with the bottom tangent line of the smoke outlet 23, and the bottom of at least one slit burner 25 is flush with the bottom of the cylinder 21. In this embodiment, preferably, the top of all slit burners 25 is flush with the bottom tangent line of the smoke outlet 23, and the bottom of all slit burners 25 is flush with the bottom of the cylinder 21.

[0037] One side of the upper part of the cylinder 21 is provided with an upper smoke box 4, which is in communication with the smoke outlet 23; the lower part of the upper smoke box 4 is provided with a lower smoke box 5; the upper smoke box 4 and the lower smoke box 5 are in communication through the convection pipe 6 bundle located therebetween, preferably, the convection pipe 6 is a smoke pipe. The upper smoke box 4 is provided with an air outlet, and the air outlet is connected with a smoke outlet pipe 7. Preferably, an induced draft fan can be arranged on the smoke outlet pipe 7, and the induced draft fan is used to guide the smoke into the smoke outlet pipe and discharge it.

[0038] The upper smoke box 4, the lower smoke box 5 and the convection pipe 6 bundle are located in the shell body 1. The inner wall of the shell body 1 and the outer wall of the convection pipe 6 bundle, the upper smoke box 4 and the lower smoke box 5 form a heating water cavity A, and the shell body 1 located outside the heating water cavity A is provided with a water outlet 8. The outer wall of the cylinder 21 and the inner wall of the shell body 1 form a cooling water cavity B, and the shell body 1 located outside the cooling water cavity B is provided with a water inlet 9. The cooling water cavity B and the heating water cavity A are in communication.

[0039] As shown in the drawings, Figures 3-5As shown, further, in this embodiment, the slit burner 25 has a support rib 252, a metal mesh 253, a baffle 251 and a top plate 254 at the top. One end of the support rib 252 is fixed to the outer edge of the top plate 254, and the other end of the support rib 252 extends downward to the bottom of the slit burner 25, and the metal mesh 253 is arranged around the periphery of the support rib 252.

[0040] Preferably, the support rib 252 can take various forms such as round steel rib, metal sheet, etc. The metal mesh 253 is generally made of high-temperature-resistant stainless steel mesh. The metal mesh 253 has two functions: one is to disperse combustion-supporting air to avoid the formation of concentrated air flow; the other is to prevent fuel from entering the slit burner 25.

[0041] The top plate 254, the metal mesh 253 and the support rib 252 combine to form an air flow space, and the baffle 251 is arranged in the air flow space in the height direction of the support rib 252. Preferably, the baffle 251 is adapted to the transverse space of the arranged position.

[0042] By arranging the baffle 251, the flow resistance of the combustion-supporting air can be increased, and part of the combustion-supporting air is forced to change its flow direction from upward to lateral, so as to reach the upper part of the combustion layer for combustion-supporting, to adapt to the gradually decreasing height of the combustion layer with the progress of the combustion process and the consumption of fuel. When the height of the combustion layer is higher than the position of the baffle 251, the combustion-supporting air will continue to flow upward after flowing around the baffle 251, and will change its flow direction to lateral when it flows to the baffle 251 above the combustion layer.

[0043] As a variation of the slit burner 25 described in this embodiment, the slit burner 25 also has a perforated plate, which is arranged around the inner periphery of the support rib 252. Specifically, the support rib 252 can be fixed to the outer wall surface of the perforated plate by welding or other fixing methods.

[0044] Of course, according to the principle of the above-mentioned slit burner, other similar structures that do not affect the use effect of the slit burner can also be designed.

[0045] Preferably, as shown in Figure 2 As shown, the slit burner 25 includes a center burner 10, a corner burner 11 and a general burner 12. Specifically, the three types of burners can be arranged alone or in combination according to the shape and size of the cross-sectional area of the combustion chamber.

[0046] As shown in Figure 2As shown, the center burner 10 is arranged in the barrel 21, preferably at the center of the barrel 21; the common burner 12 is fixedly arranged on the inner wall of the barrel 21; and the corner burner 11 is fixedly arranged at the corner of the inner wall of the barrel 21. Preferably, the top plate of the center burner 10 is circular in cross section, and can also be polygonal; the top plate of the common burner 12 and the corner burner 11 is approximately sector-shaped in cross section, and can also be polygonal. The two side edges of the top plate 254 of the common burner 12 and the corner burner 11 match the inner wall of the barrel 21.

[0047] In this embodiment, as shown in the drawings, Figure 3 The center burner 10 is fixedly arranged by arranging a connecting plate 13 at the bottom of the center burner 10, and connecting the connecting plate 13 with the inner wall of the barrel 21. The common burner 12 and the corner burner 11 can be fixed by screwing the top plate 254 with the inner wall of the barrel 21.

[0048] As shown in the drawings, Figure 1 Further, an ash drawer 14 for collecting ash is arranged in the ash chamber 3, and the ash drawer 14 is located below the grate 24. An oven door 15 is arranged on the outer side of the ash drawer 14, and the ash drawer 14 can be freely pulled out when the oven door 15 is opened.

[0049] Further, an auxiliary equipment reserved space is arranged on one side of the ash chamber 14, and the space is located below the lower smoke box 5, and is used for placing the air blower 16 for feeding air into the gap burner 25, the circuit board of the control system, and other components.

[0050] Preferably, an ignition rod 17 for igniting fuel in the barrel is arranged on the top plate 254 of the common burner 12 or the corner burner 11. The connecting line of the ignition rod 17 can be wrapped with high-temperature resistant material, and then introduced to the outside of the stove through the air flow space inside the common burner 12 or the corner burner 11, and connected to the control system circuit board.

[0051] The pull-out grate 24 and the ash drawer 14 can improve the convenience of ash removal. When the fuel is burned to the bottom, the grate 24 is pulled out directly, and the bottom ash is directly dropped into the ash drawer 14 below, so that the bottom ash can be conveniently transferred to other places, and the complexity and unreliability of the system can be avoided due to the use of a slag breaking cylinder and other equipment to remove the large slag block. On the other hand, a ignition method is provided. When a furnace of fuel is burned to the bottom, the operation of the blower 16 is stopped, the furnace door 15 is opened, and the grate 24 is pulled out. At this time, the fuel burning on the grate 24 falls into the ash drawer 14 below, and the ash drawer 14 is pulled out from the furnace door 15. The grate 24 is pushed back into the combustion chamber 2. The movable cover plate 22 of the stove is opened, and the biomass fuel is loaded into the combustion chamber 2 from the feed port position. Then, the hot fuel in the ash drawer 14 is also placed on the top layer of the biomass fuel in the combustion chamber 2 from the feed port position. Then the blower 16 is started, and the next combustion cycle is started. When the ignition rod 17 is damaged, the above-mentioned ignition method can be used conveniently and quickly.

[0052] Further, in order to improve the heating efficiency of water in the furnace, reduce the heat loss of flue gas and heat loss, the position of the water inlet 9 is opposite to the lower part of the cooling water cavity B, and the position of the water outlet 8 is opposite to the upper part of the heating water cavity A. The cold water flows through the water inlet 9, and then flows through the cooling water cavity B around the combustion chamber 2 and the heating water cavity A around the bundle of convection pipes 6, and finally is led out from the water outlet 8 into the hot water pipeline of the related user.

[0053] The specific working process of the civilian biomass stove provided by the present application is as follows:

[0054] (1) Fuel combustion process

[0055] The user loads a large amount of biomass fuel into the combustion chamber 2 at one time, and the combustion air is blown from the bottom of the blower 16 into the ash chamber 3, and then flows upward through the pull-out grate 24 into the gap burner 25. Because the space around the gap burner 25 is filled with biomass fuel, the combustion air does not flow into the fuel layer laterally during upward flow, but flows upward until there is no fuel around the gap burner 25. Thereafter, the combustion air is assisted by the baffle 251 in the gap burner 25 to improve the combustion effect of the combustion air, so that the combustion air does not directly flow upward and leave the combustion chamber 2 without playing a combustion supporting role. With the progress of the combustion process, the outlet of the combustion air gradually moves downward as the solid fuel combustion layer descends. Thus, the combustion process starts from the top layer and burns downward layer by layer to the bottom of the fuel layer. As the combustion layer develops layer by layer downward, the fuel layer gradually lowers until it is burned out at the position of the grate 24 at the lowest part, and then the whole furnace of fuel can be loaded again to start the next combustion cycle.

[0056] (2) Flue gas flow process

[0057] The flue gas generated by combustion in the combustion chamber 2 enters the upper smoke box 4 through the smoke exhaust port 23, then enters the lower smoke box 5 through the convection tube 6 bundle, and finally enters the smoke outlet pipe 7 through the air outlet and is discharged under the action of the induced draft fan.

[0058] (3) Water flow process

[0059] Cold water first enters the water inlet 9 of the stove, flows through the cooling water cavity B around the combustion chamber 2 and the heating water cavity A around the convection tube 6 bundle, and then is led out from the water outlet 8 into the user's hot water pipe.

[0060] Compared to other existing biomass stoves, this invention offers significant advantages in seven key areas: slagging / coking suppression, pollutant emission control, thermal efficiency, fuel selectivity, feeding reliability, ash removal convenience, and combustion chamber life. This makes it possible for farmers to use inexpensive fuel for winter heating, significantly reducing their heating costs. Furthermore, it fully utilizes currently unused straw resources in rural areas, reduces pollution from sulfur dioxide, nitrogen oxides, and fly ash particles associated with traditional heating methods, and improves safety during use.

[0061] The details are as follows:

[0062] (1) Slagging / coking inhibition capability

[0063] The combined use of combustion chamber 2, cooling water chamber B, and slot burner 25 not only reduces the average temperature of the entire combustion process but also reduces the temperature of the solid fuel combustion layer where ash is trapped. This is the fundamental reason why the stove provided by the present invention can effectively suppress slagging and coking during the biomass combustion process. The mechanism is detailed below:

[0064] (i) The water-cooled wall (i.e., the cold water in the cooling water cavity B surrounding the cylinder 21) can absorb a large amount of heat released during the combustion process, thereby reducing the average temperature of the entire combustion process;

[0065] (ii) Combustion air is blown into the fuel layer from the side, not from the bottom, to burn above it. This significantly reduces the oxygen supply to the solid fuel combustion layer, significantly lowering the intensity and temperature of the combustion, effectively solving the problem of slagging and coking of ash trapped within it.

[0066] (iii) The use of the slot burner 25 is one of the main reasons why the present stove can control the formation of coking and slagging during combustion. Its unique advantages are as follows:

[0067] The slot burner 25 occupies a very small area of ​​the inner wall of the combustion chamber 2 and does not affect the water-cooled wall's absorption of heat released during the combustion process, so that the water-cooled wall can truly play a role in lowering the average temperature in the combustion chamber 2.

[0068] The unique structure of the slot burner 25 eliminates the localized high temperatures within the solid fuel combustion layer that can occur in other conventional stoves. This burner first forms a slot with support ribs 252, which is then wrapped with a metal mesh 253. This structure disperses the combustion air, preventing it from being concentrated in a single area within the fuel layer. This eliminates the potential for localized high temperatures within the solid fuel layer, thus preventing slagging or coking within the solid fuel layer near the combustion air nozzle.

[0069] Field tests have shown that the structure and combustion method employed by the stove provided by the present invention reduces the temperature within the solid combustion layer by 100-200°C compared to stoves using a non-water-cooled combustion chamber and combustion air blown upward from the bottom. Consequently, the ash remaining in the combustion layer after combustion no longer overheats, thus completely resolving the problem of melt slagging and coking during biomass fuel combustion.

[0070] The success of the combustion method employed by the stove of the present invention stems from the high volatile content of biomass (approximately 70%), which decomposes and releases gases upon heating to 100-200°C, flowing upward. Consequently, combustion occurs primarily in the gaseous phase above the combustion layer, unlike with less volatile fuels such as bituminous coal and anthracite, where the combustion primarily occurs on the grate due to the relatively low volatile content and the predominantly fixed carbon content of the combustibles.

[0071] In other words, this combustion method is very suitable for burning fuels such as biomass or lignite with high volatile content, but for common fuels such as bituminous coal and anthracite, because their volatile content is not high, this combustion method is not suitable. This type of fuel is more suitable for a combustion method in which the combustion air blows upward from the bottom.

[0072] (2) Pollutant emission control capabilities

[0073] Fly ash particles: In the present invention, the combustion air is blown from the side rather than from below to the top of the fuel combustion layer, so that too much combustion ash and incompletely burned carbon will not be blown into the flue gas, thereby significantly reducing the content of fly ash particles in the flue gas.

[0074] Nitrogen Oxides: The present invention utilizes a water-cooled wall for heat absorption, coupled with a unique slit-type burner 25 combustion method with side air intake, which not only reduces the average temperature of the combustion area but also eliminates localized high temperatures, significantly reducing thermal nitrogen oxide emissions in the flue gas. As for fuel-type nitrogen oxides, since the characteristic of slit-type burners is that combustion air gradually flows laterally into the combustion chamber 2 along the height direction, rather than being primarily supplied to the fuel combustion layer from the bottom, by properly controlling the distribution ratio of combustion air along the height direction of different slit-type burners, the oxygen supply can be controlled just after the covalent bonds between nitrogen and carbon and hydrogen elements are broken, allowing some fuel nitrogen to preferentially generate NH3+HCN, which is then further converted to N2 under continued oxygen supply, thereby reducing the formation of fuel-type nitrogen oxides. Actual measurements have shown that by adjusting the air distribution ratio of the slit-type burners 25 along the height direction, the reduction in nitrogen oxide emissions can fluctuate between 0% and 30%, a level that is completely unattainable with traditional stoves and their combustion methods.

[0075] SO2: In the present invention, most of the bottom ash produced after fuel combustion does not immediately leave the grate 24, but instead falls layer by layer into the unburned fuel layer as the combustion process progresses. Therefore, this portion of bottom ash, which is rich in various alkali metals and alkaline earth metals, stays in the furnace for several or even dozens of hours before leaving the combustion chamber 2, thereby fully utilizing its excellent sulfur fixation effect and significantly reducing the SO2 content entering the flue gas. In addition, when the bottom ash ignition method is adopted, the discharged bottom ash can also be recycled and reused. Intermittent bottom ash recycling will be able to further improve the sulfur fixation effect in the furnace.

[0076] (3) Thermal efficiency

[0077] In conventional combustion methods involving grate combustion, the fuel burns to a certain extent, becoming smaller particles that may fall through the gaps in the grate 24 into the ash chamber 3, resulting in significant fixed carbon incomplete combustion losses (q4). However, in combustion methods involving the top of the furnace, lateral airflow reduces the amount of incompletely burned carbon entering the flue gas. Furthermore, the fixed carbon on the grate also falls layer by layer as it burns. The combustion process typically lasts for over ten hours, fully ensuring the complete combustion of the fixed carbon. Furthermore, by overcoming slagging and coking issues, the incomplete combustion losses of fixed carbon are significantly reduced. This method also allows for combustion of low-quality biomass fuels with high ash content.

[0078] The use of a large combustion chamber and a combustion method that gradually supplies air in the height direction above the combustion chamber also ensures the complete combustion of volatile components in the fuel, thereby reducing the chemical incomplete combustion loss q3.

[0079] The use of a large combustion chamber and water-cooled walls also significantly increases the amount of heat absorbed by the water in the cooling water chamber. Because the flame directly impacts the heating surface within the combustion chamber 2, its heat transfer efficiency far exceeds that of downstream flue gas flushing the convection tube bundle. This significantly reduces the exhaust temperature of the flue gas upon its final exit from the furnace, helping to reduce exhaust losses q2.

[0080] In addition, in the combustion chamber 2 with a water-cooled wall, the heat generated by combustion is mainly transferred to the water in the cooling water cavity B surrounding the combustion chamber 2. The temperature of the outer wall of the cylinder 21 drops significantly, and the heat dissipation loss q5 also decreases significantly.

[0081] In summary, the design of the stove of the present invention effectively reduces various heat losses and can significantly improve the thermal efficiency of the stove.

[0082] (4) Feeding reliability

[0083] Because the fuel is loaded into a tall and thin large-space combustion chamber at one time, the combustion process is from the top of the fuel layer downward layer by layer, and there is no need for feeding equipment such as augers in the middle. This completely solves the various unreliable problems of traditional stoves' feeding systems that are prone to jamming, belts that are prone to breaking, motors that are prone to burning, and smoke and even combustion in the hopper.

[0084] (5) Fuel selectivity

[0085] Since it adopts a large hearth storage combustion chamber and completely solves the problem of easy coking / slagging of biomass fuel, this stove can burn biomass fuels of various sizes and types.

[0086] (6) Convenience of ash removal

[0087] When the fuel burns to the bottom, the retractable grate 24 is directly pulled out and the bottom ash will fall directly into the ash drawer 3 below. The bottom ash can be easily transferred to other places without the need to use slag breaking equipment such as slag breaking barrels because of the difficulty in discharging large slag blocks that may appear, thereby increasing the complexity and unreliability of the system.

[0088] (7) Combustion chamber life

[0089] Excessively high temperatures in the metal barrel of a non-water-cooled combustion chamber can shorten its service life. When using a non-water-cooled combustion chamber, the entire barrel can be observed to burn red hot wherever the flame touches it. Metal oxidation occurs rapidly under high temperatures. Furthermore, once the metal barrel of the combustion chamber of this type of furnace burns out, the entire furnace is essentially scrapped. Otherwise, the entire combustion chamber will need to be replaced. Slit-type burners are different. Because one side is close to the water-cooled wall, the cooling effect is excellent. Only a portion of the burner requires high-temperature resistant materials, resulting in minimal consumption of high-temperature resistant metal. Disassembly and replacement are also very convenient.

[0090] The parts not mentioned in the present application can be realized by using or referring to the existing technology.

[0091] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present application should also be within the scope of the present application.

Claims

1. A biomass stove for civilian use, comprising a shell body and a combustion chamber located in the shell body, an ash chamber being provided below the combustion chamber, characterized in that: The combustion chamber comprises a cylinder, a feed port and a movable cover plate for covering the feed port are provided at the top of the cylinder, a smoke exhaust port is provided at the top of the cylinder, a retractable grate is provided at the bottom of the cylinder, and a plurality of slot-type burners are provided in the cylinder; The slot burner has a closed top and an open bottom, a plurality of through holes are provided on the outer wall of the slot burner, and a plurality of deflectors for increasing air flow resistance are provided inside the slot burner at intervals along the height direction of the slot burner; The top of at least one slot burner is flush with the bottom tangent line of the smoke exhaust port, and the bottom of at least one slot burner is flush with the bottom of the cylinder; An upper smoke box is provided on one side of the upper portion of the cylinder, the upper smoke box being connected to the smoke exhaust port, a lower smoke box is provided below the upper smoke box, the upper and lower smoke boxes being connected via a convection tube bundle located therebetween, an air outlet is provided on the lower smoke box, and a smoke outlet pipe is connected to the air outlet; The upper smoke box, the lower smoke box and the convection tube bundle are all located in the shell body. A heating water cavity is formed between the inner wall of the shell body and the outer walls of the convection tube bundle, the upper smoke box and the lower smoke box. A water outlet is provided on the shell body outside the heating water cavity. A cooling water cavity is formed between the outer wall of the cylinder and the inner wall of the shell body, and a water inlet is provided on the shell body outside the cooling water cavity. The cooling water cavity is connected to the heating water cavity. An ash drawer for collecting furnace ash is provided in the ash chamber, and the ash drawer is located below the grate. A blower for supplying air to the slot burner is provided on one side of the ash chamber.

2. The civilian biomass stove according to claim 1, characterized in that: The slot burner also has supporting ribs, a metal mesh and a top plate at the top, one end of the supporting rib is fixed to the outer edge of the top plate, and the other end of the supporting rib extends downward to the bottom of the slot burner, and the metal mesh is arranged around the periphery of the supporting rib.

3. The civilian biomass stove according to claim 1, characterized in that: The slot-type burner also has supporting ribs, a metal mesh, a porous plate and a top plate located at the top. One end of the supporting rib is fixed to the outer edge of the top plate, and the other end of the supporting rib extends downward to the bottom of the slot-type burner. The metal mesh is arranged around the outer periphery of the supporting rib, and the porous plate is arranged around the inner periphery of the supporting rib.

4. The civilian biomass stove according to claim 2 or 3, characterized in that: The slot burner includes one or more of a central burner, a corner burner and a common burner. The central burner is arranged in the cylinder, the common burner is arranged on the inner wall of the cylinder, and the corner burner is arranged at the angle of the inner wall of the cylinder.

5. The civilian biomass stove according to claim 4, characterized in that: The central burner is arranged at the center position of the cylinder, the cross-section of the top plate of the central burner is circular or polygonal, the cross-section of the top plates of the ordinary burner and the corner burner is fan-shaped or polygonal, and the two side edges of the top plates of the ordinary burner and the corner burner match the inner wall surface of the cylinder.

6. The civilian biomass stove according to claim 5, characterized in that: A furnace door is provided on the outer side of the ash drawer. When the furnace door is opened, the ash drawer can be freely drawn out.

7. The civilian biomass stove according to claim 6, characterized in that: An ignition rod for igniting the fuel in the cylinder is provided on the top plate of the common burner or the corner burner.

8. The civilian biomass stove according to claim 7, characterized in that: The supporting ribs are round steel bars or metal plates, and the metal mesh is a high-temperature resistant stainless steel mesh.

9. The civilian biomass stove according to any one of claims 5 to 8, characterized in that: The water inlet is arranged at a position opposite to the lower part of the cooling water cavity, and the water outlet is arranged at a position opposite to the upper part of the heating water cavity.

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