Directly-discharged external feeding biomass waste heat recovery energy-saving large pot stove

Abstract

The utility model discloses a direct -discharge type external feeding biomass waste heat recovery energy -conserving big pot stove belongs to the field of pot stove, and the outer shell is equipped with the furnace pipe, and the partition groove is formed between the furnace pipe and the outer shell, and the water tank that communicates with the partition groove is equipped outside the furnace pipe, and the flue gas passage that communicates with the furnace pipe is arranged in the water tank, and the flue gas passage is placed horizontally, and one end of water tank is connected with the water replenishing box through the water pipe, and the other end is provided with the steam export, and the furnace pipe and the outer shell are sealingly arranged on the bottom plate, and the platform sealingly covers the water tank, the outer shell and the water replenishing box. Because the flue gas temperature in the furnace pipe is higher, the flue gas can be driven to enter the flue gas passage from the furnace pipe, the flue gas passage is placed horizontally, the flue gas resistance can be greatly reduced, the fan is not needed to use again to drain, the flue gas can be directly discharged from the stove under the pressure in the furnace, the high-temperature flue gas passes through the flue gas passage, heats the water in the water tank, generates the steam, and the water in the water tank and the partition groove can flow complementarily, and the steam can overflow conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of cooking stoves, and particularly relates to a direct discharge type externally fed biomass waste heat recovery energy-saving large cooking stove. Background Art

[0002] A biomass large cooking stove is a cooking device that uses biomass fuels (such as agricultural and forestry waste like straw, wood chips, rice husks, etc.) as energy sources. It has the characteristics of energy conservation, environmental protection, and low fuel cost, and is widely used in places such as canteens, restaurants, and hotels. Currently, most large cooking stoves pay more attention to energy-saving effects, and are equipped with cookware that can closely fit the large cooking stove, forming a relatively enclosed space between the cookware and the furnace chamber to reduce the possibility of flue gas escaping from the gaps between the pot and the stove, thereby improving cooking efficiency. The flue gas then leaves the stove body through the smoke exhaust channel. The flue gas emission temperature is too high, even up to above 180°C. The waste heat in the flue gas is not well utilized, increasing energy consumption, and the relatively high-temperature flue gas affects the service life of subsequent equipment (such as flue ducts, induced draft fans, flue gas purification devices, etc.).

[0003] There are also large cooking stoves that set up water tanks beside the furnace chamber to provide hot water while cooking. However, this directly absorbs the heat generated by combustion and does not utilize the waste heat of the flue gas. Due to the limitation of the volume of the large cooking stove, the utilization of the waste heat of the flue gas is very limited. And all need to use an induced draft fan to exhaust the flue gas from the stove. The flue gas temperature is too high, and the flue gas generated during the combustion of biomass fuels contains impurities, which affects the service life of the induced draft fan, and often requires cleaning of the induced draft fan, increasing the maintenance cost. Content of the Utility Model

[0004] The purpose of the utility model is to provide a direct discharge type externally fed biomass waste heat recovery energy-saving large cooking stove to solve at least one of the problems mentioned in the above background art.

[0005] The utility model provides a direct discharge type externally fed biomass waste heat recovery energy-saving large cooking stove, which includes a furnace chamber, a bottom plate, a platform, a furnace bridge arranged below the bottom plate, and a feed bin arranged outside the furnace chamber. An outer shell is arranged outside the furnace chamber, and a partition slot is formed between the furnace chamber and the outer shell. A water tank communicated with the partition slot is arranged outside the furnace chamber. A flue gas channel communicated with the furnace chamber is arranged in the water tank. The flue gas channel is placed horizontally. One end of the water tank is connected to a water replenishing tank through a water pipe, and the other end is provided with a steam outlet. The bottom of the feed bin is connected to a feeding device, and the other end of the feeding device is communicated with the inside of the furnace chamber and is located above the furnace bridge. The furnace chamber and the outer shell are hermetically arranged on the bottom plate, and the platform hermetically covers the water tank, the outer shell, and the water replenishing tank.

[0006] Further solution: An upper partition board and a lower partition board which are arranged at intervals are provided inside the furnace liner. Both the upper partition board and the lower partition board are annular plates. The outer side walls of the upper partition board and the lower partition board are fixed on the inner wall of the furnace liner. The inner side walls of the upper partition board and the lower partition board are both connected to the vertical partition board. The upper partition board, the lower partition board, the vertical partition board and the furnace liner enclose to form a water channel, and the furnace liner is provided with a notch communicating the partition groove and the water channel.

[0007] Further solution: A number of through holes are evenly distributed on the upper partition board and the lower partition board. A flue passing through the water channel is installed in the corresponding through holes of the upper partition board and the lower partition board. Both ends of the flue are communicated with the inside of the furnace liner.

[0008] Further solution: A flue gas outlet communicating with the flue gas channel is opened on the side wall of the furnace liner. The flue gas outlet is located below the lower partition board. The vertical partition board extends towards the bottom plate and forms a flue gas passing groove with the bottom plate.

[0009] Further solution: A constant pressure ventilation pipeline for the water replenishing tank is also provided. One end of the constant pressure ventilation pipeline for the water replenishing tank is communicated with the water replenishing tank, and the other end is communicated with the partition groove.

[0010] Further solution: The bottom plate is provided with a connecting hole. A combustion chamber is provided below the bottom plate. The combustion chamber is communicated with the inside of the furnace liner through the connecting hole. The furnace bridge is erected inside the combustion chamber and is located below the connecting hole.

[0011] Further solution: An ash cleaning channel is also provided below the bottom plate. One end of the ash cleaning channel is communicated with the combustion chamber, and the other end is provided with an ash door.

[0012] Further solution: The combustion chamber is also connected with an air supply pipe. The other end of the air supply pipe is connected with a blower. A baffle is provided inside the combustion chamber. One end of the furnace bridge is erected on the baffle, and the other end is erected on the upwardly inclined bottom plate of the combustion chamber. An air supply port is opened on the baffle, and the air supply port is located above the furnace bridge.

[0013] Further solution: A fire viewing pipe is also provided. One end of the fire viewing pipe extends into the furnace liner, and the other end extends out of the outer shell. The end of the fire viewing pipe extending into the furnace liner is embedded on the water channel.

[0014] Further solution: The outer shell is also provided with a slag discharge port communicating the partition groove with the outside.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. The utility model is provided with a partition groove, and cold water is injected into the partition groove, which can not only absorb the heat radiated outward by the furnace liner, but also cool and insulate, avoiding overheating of the outside of the stove. The generated steam leaves the large stove through the water tank and the steam outlet and is supplied to the equipment with steam demand. Since the flue gas temperature in the furnace liner is relatively high, it can drive the flue gas to enter the flue gas passage from the furnace liner. The flue gas passage is placed horizontally, which can greatly reduce the flue gas resistance. Without using a blower for drainage, the flue gas can be directly discharged from the stove under the furnace pressure, reducing the maintenance cost. The high-temperature flue gas passes through the flue gas passage and heats the water in the water tank, and steam can also be generated, making use of the waste heat of the flue gas, greatly reducing the temperature of the flue gas tail gas, and reducing the energy consumption loss. Moreover, the water in the water tank and the partition groove can flow and complement each other, facilitating the overflow of steam and improving the utilization rate of waste heat.

[0017] 2. A water channel is arranged in the furnace liner, and the water in the partition groove can enter the water channel. When the high-temperature flue gas flows in the furnace liner, it can pass through the flue and exchange heat with the water in the water channel, greatly increasing the heat exchange area in a limited space, improving the heat exchange rate, strengthening the utilization of the waste heat of the flue gas, and greatly reducing the temperature of the flue gas entering the smoke exhaust passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For the convenience of those skilled in the art to understand, the present utility model will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic structural diagram (one) of a preferred embodiment of the present utility model;

[0020] Figure 2 It is a schematic structural diagram (two) of a preferred embodiment of the present utility model;

[0021] Figure 3 It is a top view of the preferred embodiment of the present utility model after removing the platform;

[0022] Figure 4 It is a schematic diagram of the internal structure of the outer shell in the preferred embodiment of the present utility model.

[0023] In the figure: 1 - hopper; 2 - feeding device; 3 - support; 4 - platform; 5 - outer shell; 6 - viewing pipe; 7 - ash cleaning channel; 8 - water replenishing tank; 9 - water pipe; 10 - water tank; 11 - partition groove; 12 - furnace liner; 13 - constant pressure ventilation pipeline of water replenishing tank; 14 - flue gas passage; 15 - steam outlet; 16 - smoke exhaust passage; 17 - furnace bridge; 18 - upper partition board; 19 - vertical partition board; 20 - flue; 21 - lower partition board; 22 - air supply pipe; 23 - combustion chamber; 231 - baffle; 24 - water channel; 25 - flue gas outlet; 26 - bottom plate; 27 - slag outlet; 28 - caster. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present utility model, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meanings and thus cannot be construed as limiting the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the figure is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0029] Please refer to Figures 1 - 4 As shown, this embodiment provides a direct - row external feeding biomass waste - heat recovery energy - saving large - pot stove, which includes a furnace liner 12, a bottom plate 26, a platform 4, a furnace bridge 17 arranged below the bottom plate 26, and a feed bin 1 arranged outside the furnace liner 12. An outer shell 5 is provided outside the furnace liner 12. A partition slot 11 is formed between the furnace liner 12 and the outer shell 5. A water tank 10 communicating with the partition slot 11 is provided outside the furnace liner 12. A flue gas channel 14 communicating with the furnace liner 12 is arranged in the water tank 10. The flue gas channel 14 is horizontally placed. One end of the water tank 10 is connected to a water replenishing tank 8 through a water pipe 9, and the other end is provided with a steam outlet 15. The bottom of the feed bin 1 is connected to a feeding device 2. The other end of the feeding device 2 communicates with the inside of the furnace liner 12 and is located above the furnace bridge 17. The furnace liner 12 and the outer shell 5 are hermetically arranged on the bottom plate 26. The platform 4 hermetically covers the water tank 10, the outer shell 5, and the water replenishing tank 8.

[0030] The silo 1 of the utility model is independently arranged outside the large pot stove, and external feeding is realized through the feeding device 2. The volume of the silo 1 can be set relatively large according to requirements, without being limited by the volume of the large pot stove, and the number of times of adding biomass fuel to the silo 1 can be reduced. Exemplarily, the feeding device 2 selects a screw conveyor in the prior art. The front end of the screw conveyor is connected to the discharge port at the bottom of the silo 1, and the biomass fuel stored in the silo 1 is spirally transported to the furnace bridge 17 in the combustion chamber for combustion. A circular stove hole corresponding to the opening at the top of the furnace liner is provided on the platform 4 for placing the cooking pot. The cooking pot fits with the circular stove hole, which can prevent the flue gas from overflowing from the gap between the cooking pot and the platform 4. First, start the feeding device 2 to transport the biomass fuel to the furnace bridge 17, place the cooking pot, ignite the biomass fuel, and the feeding device 2 continuously transports the biomass fuel in the silo 1 to the furnace bridge 17 to maintain combustion. It should be noted that the ignition device for igniting the biomass fuel can select the ceramic heating element ignition method. Generally, the ceramic heating element is installed near the furnace bridge 17 through a wind jacket. The ceramic heating element is installed in the wind jacket. One end of the wind jacket is connected above the furnace bridge 17, and the other end is connected to the air supply pipe 22 that conveys air to the combustion chamber. When igniting, the ceramic heating element is powered on, and the ceramic heating element generates heat, heats the air passing through the wind jacket, and blows it to the biomass fuel located on the furnace bridge 17, so that the biomass fuel reaches the ignition point and is ignited. The ignition device is prior art, and its specific structure and power supply method will not be elaborated here.

[0031] Preferably, the silo 1 is provided with a base, and is elevated by the base so that the front end of the feeding device 2 is connected to the discharge port at the bottom of the silo 1, and the driving device of the feeding device 2 can also be fixedly installed on the base.

[0032] Cold water is injected into the water tank 10 and the partition tank 11 through the water replenishing tank 8. The cold water in the partition tank 11 can both absorb the heat radiated outward by the furnace liner 12 and cool and insulate, preventing the outside of the stove from overheating. The cold water in the partition tank 11 boils and evaporates, and the generated steam leaves the large pot stove through the water tank 10 and the steam outlet 15. The steam outlet 15 can be connected to a pipeline to equipment with steam demand. Since the flue gas temperature in the furnace liner 12 is relatively high, it can drive the flue gas to enter the flue gas channel 14 from the furnace liner 12. The flue gas channel 14 is horizontally placed, which can greatly reduce the flue gas resistance. Without using a fan for drainage, the flue gas can be directly discharged from the stove under the furnace pressure, reducing the maintenance cost. The high-temperature flue gas passes through the flue gas channel 14 and heats the water in the water tank 10, and steam can also be generated, making use of the waste heat of the flue gas, greatly reducing the temperature of the flue gas tail gas, and reducing the energy consumption loss. And the water in the water tank 10 and the partition tank 11 can flow and complement each other, facilitating the overflow of steam and improving the waste heat utilization rate.

[0033] The furnace liner 12 and the outer shell 5 are hermetically arranged on the bottom plate 26 to prevent water leakage from the partition groove 11. Preferably, the furnace liner 12 is fixedly installed on the bracket 3, and the water replenishing tank 8 can also be fixed on the side of the bracket 3. The bottom surface of the water replenishing tank 8 is higher than the bottom surface of the water tank 10, and the top surface of the water replenishing tank 8 is flush with the top surface of the water tank 10, which is convenient for the platform 4 to be hermetically closed on the water tank 10, the outer shell 5 and the water replenishing tank 8. One end of the water pipe 9 is connected to the water outlet at the bottom surface of the water replenishing tank 8, and the other end is connected to the water inlet on the side of the water tank 10, and the position of the water outlet of the water replenishing tank 8 is higher than the position of the water inlet of the water tank 10, so that the water in the water replenishing tank 8 can flow into the water tank 10 under the action of its own gravity without the need of a water pump.

[0034] Furthermore, a constant pressure ventilation pipe 13 for the water replenishing tank is also provided. One end of the constant pressure ventilation pipe 13 for the water replenishing tank is connected to the water replenishing tank 8, and the other end is connected to the partition groove 11, so as to prevent the air pressure in the water tank 10 and the partition groove 11 from being higher than that in the water replenishing tank 8 due to the action of water vapor, which affects the water replenishing of the water replenishing tank 8 to the water tank 10 and the partition groove 11. The constant pressure ventilation pipe 13 for the water replenishing tank can balance the air pressure between the water replenishing tank 8 and the water tank 10 and the partition groove 11, making the water replenishing smooth.

[0035] In some embodiments, please refer to Figures 1 - 4 As shown, upper partition plates 18 and lower partition plates 21 arranged at intervals are provided in the furnace liner 12. The upper partition plates 18 and the lower partition plates 21 are both annular plates. The outer side walls of the upper partition plates 18 and the lower partition plates 21 are fixedly arranged on the inner wall of the furnace liner 12, and the inner side walls of the upper partition plates 18 and the lower partition plates 21 are both connected to the vertical partition plates 19. The upper partition plates 18, the lower partition plates 21, the vertical partition plates 19 and the furnace liner 12 enclose a water channel 24. The furnace liner 12 is provided with a notch connecting the partition groove 11 and the water channel 24. The water in the partition groove 11 can flow into the water channel 24, increasing the heat exchange area.

[0036] The notch can be located at the position of the furnace liner 12 corresponding to the water channel 24 and be evenly distributed in a ring shape. For the convenience of cleaning the scale in the water channel 24, the notch is close to the lower partition plate 21.

[0037] In some embodiments, please refer to Figures 1 - 4 As shown, a number of through holes are evenly distributed on the upper partition plates 18 and the lower partition plates 21. A flue 20 penetrating through the water channel 24 is installed in the corresponding through holes of the upper partition plates 18 and the lower partition plates 21. Both ends of the flue 20 are communicated with the inside of the furnace liner 12. High-temperature flue gas can flow in and out through the flue 20, and the flue 20 passes through the water channel 24, greatly increasing the heat exchange area in a limited space, improving the heat exchange rate, strengthening the utilization of the waste heat of the flue gas, and greatly reducing the temperature of the flue gas entering the smoke exhaust channel.

[0038] Further, a flue gas outlet 25 communicating with the flue gas passage 14 is provided on the side wall of the furnace liner 12. The flue gas outlet 25 is located below the lower partition plate 21. The vertical partition plate 19 extends towards the bottom plate 26 and forms a flue gas trough between it and the bottom plate 26. The flue gas trough allows the flue gas to pass through, and at the same time can prevent the flue gas from directly hitting the outlet of the flue 20 near the lower partition plate 21, avoiding the simultaneous intake of air at both ends of the flue 20 and blocking the smooth flow of the flue gas in the flue 20. The bottom of the flue gas outlet 25 and the bottom of the flue gas passage 14 are on the same plane, which is convenient for the smooth direct discharge of the flue gas from the stove under the furnace pressure.

[0039] In some embodiments, refer to Figures 1 - 4 As shown, the bottom plate 26 is provided with a connection hole. A combustion chamber 23 is provided below the bottom plate 26. The combustion chamber 23 is connected to the inside of the furnace liner 12 through the connection hole. The furnace grate 17 is installed inside the combustion chamber 23 and is located below the connection hole. The combustion chamber 23 is also connected with an air supply pipe 22. The other end of the air supply pipe 22 is connected to a blower. A baffle 231 is provided inside the combustion chamber 23. The baffle 231 divides the combustion chamber 23 into a combustion chamber and an air chamber. One end of the furnace grate 17 is installed on the baffle 23, and the other end is installed on the upwardly inclined bottom plate of the combustion chamber. Specifically, the furnace grate 17 is located in the combustion chamber. The outlet end of the screw conveyor passes through the air chamber and is installed on the baffle 2, and conveys the biomass fuel onto the furnace grate 17. The air supply pipe 22 sends air into the air chamber. Air supply openings are provided on the baffle 231. The air supply openings are located above the furnace grate, and air is input above the furnace grate through the air supply openings to provide oxygen for supporting combustion.

[0040] Further, an ash cleaning passage 7 is also provided below the bottom plate 26. One end of the ash cleaning passage 7 is connected to the combustion chamber 23, and the other end is provided with an ash door. The ash cleaning passage 7 is used to discharge the ashes formed after the combustion of the biomass fuel. The blower is fixed to the base of the silo 1.

[0041] In some embodiments, refer to Figure 1 As shown, a fire viewing pipe 6 is also provided. One end of the fire viewing pipe 6 extends into the furnace liner 12, and the other end extends out of the outer shell 5. The combustion situation inside the large pot stove can be observed through the fire viewing pipe 6. Preferably, one end of the fire viewing pipe 6 extending into the furnace liner 12 is embedded on the water channel 24. Specifically, placement grooves can be processed on the furnace liner 12, the upper partition plate 18, and the vertical partition plate 19. One end of the fire viewing pipe 6 extending into the furnace liner 12 is embedded in the placement groove, and the sealing of the water channel 24 is done well. The cooling water in the water channel 24 can cool one end of the fire viewing pipe 6 extending into the furnace liner 12, avoiding the transfer of heat from one end of the fire viewing pipe 6 extending into the furnace liner 12 to the other end and scalding the operator. It should be noted that for the convenience of installation and reduction of sealing points, through holes can be processed on the furnace liner 12 and the vertical partition plate 19. The fire viewing pipe 6 passes through the through holes on the furnace liner 12 and the vertical partition plate 19, and the sealing of the through position is done well.

[0042] In some embodiments, refer toFigure 1 As shown, the outer shell 5 is further provided with a slag discharge port 27 that communicates the partition tank 11 with the outside. Through the slag discharge port 27, the scale condition in the partition tank 11 can be inspected, and the scale cleaned off can also be discharged. A plurality of slag discharge ports 27 can be arranged along the circumferential direction of the outer shell 5.

[0043] Preferably, a sewage discharge port can also be arranged at the position of the bottom plate 26 corresponding to the partition tank 11 to wash the scale cleaned off with water, and the sewage after washing can be discharged from the sewage discharge port.

[0044] It should be noted that the slag discharge port 27 and the sewage discharge port are both provided with sealing covers.

[0045] In some embodiments, please refer to Figure 1 As shown, the bracket 3 and the base are both provided with casters 28 for convenient movement.

[0046] It should be noted that since the present utility model involves water passing and steam generation, for the components that need to pass water, transport water, generate steam, and transport steam mentioned above, the places that need to be sealed should be sealed, which is known to those skilled in the art and will not be elaborated here. The feeding device 2 and the fan need to be connected to an external power supply and can achieve switch control and speed regulation, which is also known to those skilled in the art. The feeding device 2 and the fan in the prior art can be selected, and their control methods are also in the prior art and will not be elaborated here.

[0047] The above content is only an example and explanation of the structure of the present utility model. Those skilled in the art in the technical field to which the present application pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims of the present application, they should fall within the protection scope of the present utility model.

Claims

1. A direct-discharge, externally fed biomass waste heat recovery energy-saving large boiler stove, comprising a furnace chamber, a bottom plate, a platform, a furnace bridge disposed below the bottom plate, and a hopper disposed outside the furnace chamber, characterized in that, The furnace chamber is equipped with an outer shell, and a partition groove is formed between the furnace chamber and the outer shell. A water tank communicating with the partition groove is provided outside the furnace chamber. A flue gas passage communicating with the furnace chamber is arranged in the water tank. The flue gas passage is placed horizontally. One end of the water tank is connected to a water supply tank through a water pipe, and the other end is provided with a steam outlet. A material conveying device is connected to the bottom of the hopper. The other end of the material conveying device is connected to the inside of the furnace chamber and is located above the furnace bridge. The furnace chamber and the outer shell are sealed on the base plate. The platform is sealed and covered on the water tank, the outer shell, and the water supply tank.

2. The direct-vent external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 1, characterized in that, The furnace chamber is provided with an upper baffle and a lower baffle arranged at intervals. Both the upper baffle and the lower baffle are annular plates. The outer side walls of the upper baffle and the lower baffle are fixed to the inner wall of the furnace chamber. The inner side walls of the upper baffle and the lower baffle are connected to the vertical baffle. The upper baffle, the lower baffle, the vertical baffle, and the furnace chamber enclose a water channel. The furnace chamber is provided with a notch that connects the baffle and the water channel.

3. The direct-discharge external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 2, characterized in that, The upper and lower partitions are each provided with several through holes. Flues that pass through water channels are installed in the corresponding through holes of the upper and lower partitions. Both ends of the flues are connected to the interior of the furnace.

4. A direct-discharge externally fed biomass waste heat recovery energy-saving large-scale cooking stove according to claim 2 or 3, characterized in that, The furnace sidewall has a flue gas outlet that communicates with the flue gas passage. The flue gas outlet is located below the lower baffle plate. The vertical baffle plate extends towards the bottom plate and forms a flue gas passage groove with the bottom plate.

5. The direct-vent external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 2, characterized in that, It is also equipped with a fire observation tube, one end of which extends into the furnace chamber and the other end extends out of the outer shell. The end of the fire observation tube that extends into the furnace chamber is embedded in the water channel.

6. The direct-vent external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 1, characterized in that, It is also equipped with a constant pressure ventilation pipe for the water supply tank, with one end of the constant pressure ventilation pipe connected to the water supply tank and the other end connected to the partition.

7. The direct-vent external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 1, characterized in that, The base plate is provided with a connection hole, and a combustion chamber is provided below the base plate. The combustion chamber is connected to the inside of the furnace liner through the connection hole. The furnace bridge is installed inside the combustion chamber and located below the connection hole.

8. The direct-discharge external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 7, characterized in that, The bottom plate is also provided with an ash removal channel, one end of which is connected to the combustion chamber and the other end is provided with an ash door.

9. A direct-discharge externally fed biomass waste heat recovery energy-saving large-scale cooking stove according to claim 7, characterized in that, The combustion chamber is also connected to an air supply pipe, the other end of which is connected to a fan. A baffle is provided in the combustion chamber. One end of the furnace bridge is mounted on the baffle, and the other end is mounted on the upwardly inclined bottom plate of the combustion chamber. An air supply port is provided on the baffle and is located above the furnace bridge.

10. A direct-vent external feeding biomass waste heat recovery energy-saving large-scale cooking stove according to claim 1, characterized in that, The outer shell is also provided with a slag outlet that connects the partition groove to the outside.

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