A flue gas waste heat utilization gas range

Abstract

This utility model discloses a gas-fired large-scale cooking stove that utilizes waste heat from flue gas, belonging to the field of cooking stoves. The top of the stove's inner chamber has a top partition extending inwards. On one side of the top partition near the center of the inner chamber, an inner cladding plate extends away from the inner chamber, and on the other side, an outer cladding plate is provided. The upper cladding plate covers the inner and outer cladding plates, forming a flue gas exhaust chamber. A preheating gas pipe and a water pipe are located within the exhaust chamber. One end of the preheating gas pipe is connected to a combustion-supporting gas pipe connector, and both ends of the water pipe are connected to a circulating water tank. The exhaust chamber is arranged in a ring shape above the inner side of the inner chamber, making efficient use of the stove space, with a compact layout, and ensuring sufficient flue gas flow path. This provides favorable conditions for heat exchange between the preheating gas pipe and the water pipe located within the exhaust chamber. The air supplied to the burner by the fan is first preheated by the flue gas for better combustion, and the water flowing in the water pipe enhances the utilization of waste heat from the flue gas, further reducing the flue gas emission temperature.

Description

Technical Field

[0001] This utility model belongs to the field of cooking stove technology, specifically a gas-fired large cooking stove that utilizes waste heat from flue gas. Background Technology

[0002] Gas-fired wok stoves, characterized by rapid heating, powerful flames, and suitability for large-scale cooking, are widely used in canteens, restaurants, and hotels. Users are highly sensitive to energy costs. Current gas-fired wok stoves prioritize energy efficiency, incorporating cookware that fits snugly against the stove to create a relatively enclosed space between the cookware and the burner, minimizing the possibility of fumes escaping through gaps and improving cooking efficiency. However, excessively high exhaust temperatures, sometimes exceeding 180°C, prevent the proper utilization of residual heat, increasing energy consumption and impacting the lifespan of downstream equipment such as flues and flue gas purification systems.

[0003] Some large cooking stoves on the market are equipped with water tanks. The flue pipe passes through the water tank, and the waste heat of the flue gas is used to heat the water in the tank, which lowers the temperature of the flue gas. However, the heat exchange path is relatively short, and the frequency of hot water use in the tank often changes, especially in summer when the amount of hot water used is less. If the water in the tank is not used in time after being heated, it will also affect the heat exchange effect. If the water in the tank cools down naturally after the large cooking stove is turned off, it will result in a waste of heat energy. Utility Model Content

[0004] The purpose of this utility model is to provide a gas-fired large-scale cooking stove that utilizes waste heat from flue gas, in order to solve the problems of high flue gas emission temperature causing resource waste, affecting the service life of subsequent equipment, and low utilization rate of waste heat from flue gas.

[0005] This utility model provides a gas-fired large-scale cooking stove that utilizes waste heat from flue gas, including a support frame, a stove interior mounted on the support frame, and a burner head positioned at the center of the bottom of the stove interior. The burner head is equipped with a gas pipe connector and a combustion-supporting gas pipe connector. The top of the stove interior has a top partition extending into the interior of the stove interior. On the side of the top partition closest to the center of the stove interior, there is an inner cladding plate extending away from the stove interior. On the other side of the top partition, there is an outer cladding plate. The upper cladding plate covers the inner cladding plate and the outer cladding plate. The inner cladding plate, the outer cladding plate, the top partition, and the upper cladding plate together form a smoke exhaust chamber. The smoke exhaust chamber is connected to the interior of the stove interior and the smoke exhaust channel. The smoke exhaust chamber is equipped with a preheating gas pipe and a water pipe. One end of the preheating gas pipe is connected to an air inlet pipe connector, and the other end is connected to a combustion-supporting gas pipe connector. The air inlet pipe connector is connected to the air outlet pipe of a fan. Both ends of the water pipe are connected to a circulating water tank.

[0006] A further solution: The inner circumference plate is provided with several evenly distributed smoke exhaust holes.

[0007] A further solution: The top partition is provided with a pot ring, and an outer cover is provided on the outside of the pot ring.

[0008] A further option: The upper enclosure is also provided with a platform arranged parallel to the upper enclosure, and the platform is located outside the outer cover.

[0009] A further solution: A mounting plate is provided on one side of the bracket, and a fan and a gas distribution pipe are mounted on the mounting plate. The gas distribution pipe is connected to a gas pipe joint.

[0010] A further embodiment: The inner pot is a hollow frustum-shaped cone with a bottom diameter smaller than the top diameter. The bottom of the inner pot is provided with a base plate, and a center hole for the burner head to be installed through the base plate is opened in the center of the base plate.

[0011] A further solution: Two parallel support rods are fixedly mounted on the bracket, and the stove burner is fixed to the two support rods via a base plate.

[0012] A further option: the preheating gas pipe is an aluminum pipe or a copper pipe.

[0013] A further option: the water pipe is an aluminum pipe or a copper pipe.

[0014] A further solution: the support frame is equipped with a baffle plate.

[0015] Compared with existing technologies, the advantages of this invention are as follows: the exhaust chamber is arranged in a ring shape above the inner side of the burner, making reasonable use of the stove space, with a compact layout, and ensuring the flow path of the flue gas. This provides favorable conditions for heat exchange between the preheating gas pipe and water pipe located within the exhaust chamber. The two ends of the preheating gas pipe are connected to the fan and the burner respectively. The air delivered to the burner by the fan first exchanges heat with the high-temperature flue gas through the preheating gas pipe, which not only enhances the utilization of waste heat, heating the air entering the burner for better combustion, but also significantly reduces the temperature of the flue gas leaving the stove. The two ends of the water pipe are connected to a circulating water tank, enhancing the utilization of waste heat from the flue gas, further reducing the flue gas emission temperature, and the circulating water tank can provide warm or hot water. The gas-fired large-pot stove provided by this invention features a compact structure, high heat output capacity, complete combustion, energy saving, and reduced heat emissions, greatly reducing operating costs. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the structure after the removal of the enclosure panels in a preferred embodiment of this utility model; Figure 3 This is a schematic diagram of the internal structure of the stove.

[0018] In the diagram: 1-Bracket; 101-Support rod; 2-Platform; 3-Burnhouse; 31-Upper enclosure; 32-Inner enclosure; 321-Exhaust vent; 33-Top partition; 34-Outer enclosure; 35-Bottom plate; 4-Exhaust duct; 5-Exhaust chamber; 6-Inlet pipe connector; 7-Outer cover; 8-Mounting plate; 9-Fan; 10-Gas distribution pipe; 11-Preheating gas pipe; 12-Stove head; 121-Gas pipe connector; 122-Gas auxiliary gas pipe connector; 13-Pot; 14-Pot ring; 15-Water pipe; 16-Enclosure panel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0022] Please see Figures 1-3 As shown, this embodiment provides a gas-fired large-scale cooking stove utilizing flue gas waste heat, including a support 1, a cooker 3 mounted on the support 1, and a burner head 12 located at the center of the bottom of the cooker 3. The burner head 12 is equipped with a gas pipe connector 121 and a combustion-supporting gas pipe connector 122. The top of the cooker 3 is provided with a top partition 33 extending into the interior of the cooker 3. On the side of the top partition 33 near the center of the cooker 3, there is an inner circumference plate 32 extending away from the cooker 3. On the other side of the top partition 33, there is an outer circumference plate 34. The upper circumference plate 31 covers the inner circumference plate 32 and the outer circumference plate 34. The inner circumference plate 3... 2. The outer perimeter plate 34, top partition plate 33, and upper perimeter plate 31 enclose and form the smoke exhaust chamber 5. The connection between the inner perimeter plate 32, outer perimeter plate 34, top partition plate 33, and upper perimeter plate 31 must be sealed. The smoke exhaust chamber 5 is connected to the interior of the stove bladder 3 and the smoke exhaust channel 4. The smoke exhaust chamber 5 is equipped with a preheating gas pipe 11 and a water pipe 15. One end of the preheating gas pipe 11 is connected to the air inlet pipe joint 6 through a pipe, and the other end is connected to the combustion gas pipe joint 122 through a pipe. The air inlet pipe joint 6 is connected to the air outlet pipe of the fan 9 through a pipe. Both ends of the water pipe 15 are connected to the circulating water tank through pipes. The circulating water tank is equipped with an inlet pipe for connecting to the water source and an outlet pipe. Both the inlet and outlet pipes are equipped with valves. The circulating water tank is existing technology, and its specific structure will not be described in detail.

[0023] The burner head 12 of the gas-fired wok stove is the core component of the combustion system, playing a crucial role in mixing gas and air, ignition and combustion, and heat transfer. The burner head 12 is equipped with a gas pipe connector 121 and an auxiliary gas pipe connector 122. The gas pipe connector 121 connects to the pipe supplying gas for combustion, and the auxiliary gas pipe connector 122 connects to the pipe supplying oxygen for combustion. An igniter is also installed inside the burner head 12. This application does not improve the burner head 12; it utilizes existing technology.

[0024] A pot 13 is placed on the stove burner 3, and the pot 13 is installed flush with the stove to prevent smoke from escaping through the gap between the pot 13 and the stove. When the fan 9 is turned on, the ambient temperature air from the fan 9 outlet enters the preheating pipe 11, is preheated by the flue gas in the exhaust chamber 5, and then supplied to the burner 12. After the burner 12 is ignited, stable combustion occurs within the stove burner 3. The flue gas then enters the exhaust chamber 5, where it circulates and exchanges heat with the air in the preheating pipe 11 and the water in the water pipe 15. To further improve the heat exchange effect, the preheating pipe 11 and the water pipe 15 are made of aluminum or copper. The high-temperature flue gas heats the air in the preheating pipe 11 before it is sent to the burner 12 through the pipe. The increased temperature of the preheated air accelerates the gasification process of the gas and promotes rapid mixing of the gas and air, forming a more uniform combustible mixture. Furthermore, preheated air provides a higher initial temperature for combustion, reducing the activation energy required for fuel ignition, resulting in more complete combustion and reducing pollutants such as carbon monoxide (CO) and hydrocarbons (HC) produced by incomplete combustion, while also avoiding the waste of unburned fuel. The heat carried by the high-temperature air directly participates in the combustion reaction, accelerating the combustion speed, increasing the heat released per unit time, and improving the heat output capacity of the stove. Air preheating does not require the consumption of other energy, greatly reducing energy consumption, emissions, and the burden on flue gas treatment. The high-temperature flue gas can also heat the water flowing in water pipe 15, further reducing the exhaust temperature of the flue gas. A water pump is installed on the pipe connecting the circulating water tank and the inlet of water pipe 15, which allows water to circulate between the circulating water tank and water pipe 15. Water in the circulating water tank can be discharged from the outlet pipe for use, and water can be replenished to the circulating water tank from the inlet pipe.

[0025] The upper enclosure 31, inner enclosure 32, outer enclosure 34, and top partition 33 are all annular. The inner enclosure 32 and outer enclosure 34 are placed vertically, with the inner enclosure 32 located inside the outer enclosure 34. The upper enclosure 31 and top partition 33 are placed horizontally on the upper and lower sides of the inner enclosure 32 and outer enclosure 34, respectively. The distance between the inner enclosure 32 and outer enclosure 34 is less than or equal to the width of the top partition 33. The enclosed exhaust chamber 5 is also annular, arranged in a ring above the inner side of the furnace liner 3, facilitating direct entry of flue gas into the exhaust chamber 5. The preheating gas pipe 11 and water pipe 15 are arranged within the annular exhaust chamber 5, extending the heat exchange path to ensure more thorough preheating of the air. The heat exchange through the water pipe 15 further reduces the exhaust gas temperature. The flue gas flows within the annular exhaust chamber and exits the gas stove via the exhaust pipe 4. The gas stove has a simple and compact structure, occupying little space.

[0026] Both ends of the preheating gas pipe 11 and water pipe 15 are equipped with pipe joints to connect with the corresponding external pipes (not shown in the figure). All four pipe joints must pass through the outer plate 34, and the penetration points must be sealed to prevent flue gas leakage.

[0027] In some embodiments, please refer to Figure 1 , Figure 3 As shown, the inner circumference plate 32 is provided with several evenly distributed smoke exhaust holes 321. The smoke in the stove bladder 3 enters the smoke exhaust chamber through the smoke exhaust holes 321. The smoke entering the smoke exhaust chamber from the several smoke exhaust holes 321 affects each other, which helps the smoke to be dispersed to the outer periphery of the preheating gas pipe 11 and water pipe 15 in the smoke exhaust chamber, thereby improving the heat exchange effect.

[0028] In some embodiments, please refer to Figures 1-3 As shown, a pot ring 14 is provided on the top partition 33, and an outer cover 7 is provided on the outside of the pot ring 14. The pot ring 14 can provide stable support for the pot, and at the same time ensure that when the pot 13 is installed on the stove, a gap is left between the inner partition 32 and the pot 13, so that the flue gas can enter the flue gas chamber through the gap from the flue gas hole 321. The upper partition 31 is also provided with a platform 2 arranged parallel to the upper partition 31. The platform 2 is located outside the outer cover 7. The outer periphery of the platform 2 is supported by the bracket 1, and the inner side of the platform 2 is supported by the upper partition 31.

[0029] In some embodiments, please refer to Figure 2 As shown, a mounting plate 8 is provided on one side of the bracket 1. A fan 9 and a gas distribution pipe 10 are mounted on the mounting plate 8. The gas distribution pipe 10 is connected to a gas pipe connector 121. The gas distribution pipe 10 is used to connect to the municipal gas pipeline, supplying gas to gas-fired stoves or other gas equipment. Each branch of the gas distribution pipe 10 is equipped with a valve to control the gas flow rate of the branch, thereby controlling the heat output. The structure and installation connection method of the gas distribution pipe 10 and the valves are all existing technologies. The gas pipe connector 121 is connected to one branch of the gas distribution pipe 10 via a pipe (not shown in the figure).

[0030] In some embodiments, please refer to Figure 3 As shown, the inner pot 3 is a hollow, frustum-shaped cone with a smaller bottom diameter than the top diameter, which facilitates even heating of the bottom of the cookware 13. The bottom of the inner pot 3 is provided with a base plate 35, and the center of the base plate 35 has a central hole for the burner head 12 to pass through and be installed. The burner head 12 is detachably fixed to the base plate 35, and the connection between the burner head 12 and the base plate 35 is kept sealed.

[0031] In some embodiments, please refer to Figure 3 As shown, two parallel support rods 101 are fixed on the bracket 1, and the stove bladder 3 is fixed on the two support rods 101 by the base plate 35.

[0032] It should be noted that heat insulation material can be coated on the top of platform 2 and the outer wall of the stove 3 to reduce heat radiation into the environment and prevent the working environment temperature from becoming too high. Enclosures 16 can be installed around the front, back, left, and right sides of the support 1, or around the front, left, and right sides. Ventilation holes are provided on the left and right enclosures 16 to create air convection on both sides, reducing heat radiation to the cook in front of the stove and facilitating air extraction by the fan 9. To facilitate the cook's adjustment of the heat, a mounting plate 8 is installed on the side of the support 1 in front of the stove, and the operating handle of the valve on the gas distribution pipe 10 branch can be installed through the enclosure 16.

[0033] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A gas-fired large-scale cooking stove utilizing flue gas waste heat, comprising a support frame, a burner mounted on the support frame, and a burner head positioned at the center of the bottom of the burner head, the burner head being equipped with a gas pipe connector and a combustion-supporting gas pipe connector, characterized in that, The top of the stove is provided with a top partition extending into the stove. On the side of the top partition near the center of the stove, there is an inner enclosure extending away from the stove. On the other side of the top partition, there is an outer enclosure. The upper enclosure covers the inner enclosure and the outer enclosure. The inner enclosure, the outer enclosure, the top partition, and the upper enclosure form a smoke exhaust chamber. The smoke exhaust chamber is connected to the inside of the stove and the smoke exhaust channel. A preheating gas pipe and a water pipe are provided in the smoke exhaust chamber. One end of the preheating gas pipe is connected to the air inlet pipe connector, and the other end is connected to the combustion-supporting gas pipe connector. The air inlet pipe connector is connected to the air outlet pipe of the fan. Both ends of the water pipe are connected to the circulating water tank.

2. The flue gas waste heat utilization gas-fired large-scale cooking stove according to claim 1, characterized in that, The inner circumference plate is provided with several evenly distributed smoke exhaust holes.

3. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to claim 1, characterized in that, The top partition is provided with a pot ring, and an outer cover is provided on the outside of the pot ring.

4. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to claim 3, characterized in that, The upper enclosure is also provided with a platform arranged parallel to the upper enclosure, and the platform is located outside the outer cover.

5. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to claim 1, characterized in that, The bracket has a mounting plate on one side, on which a fan and a gas distribution pipe are mounted. The gas distribution pipe is connected to a gas pipe joint.

6. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to claim 1, characterized in that, The inner burner is a hollow, frustum-shaped cone with a bottom diameter smaller than the top diameter. The bottom of the inner burner is provided with a base plate, and a center hole for the burner head to be installed through the base plate is provided in the center of the base plate.

7. A gas-fired large-scale cooking stove for utilizing flue gas waste heat according to claim 6, characterized in that, Two parallel support rods are fixed on the bracket, and the stove burner is fixed to the two support rods by the base plate.

8. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to any one of claims 1-6, characterized in that, The preheating gas pipe is made of aluminum or copper.

9. A gas-fired large-scale boiler stove utilizing flue gas waste heat according to any one of claims 1-6, characterized in that, The water pipe is made of aluminum or copper.

10. A gas-fired boiler stove for utilizing flue gas waste heat according to claim 1, characterized in that, The support structure is equipped with a retaining wall.

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