Hot blast stove with refractory pipe

Abstract

The utility model relates to the technical field of hot blast stoves, in particular to a hot blast stove with a refractory pipe, which comprises a stove body, a hearth, a burner, the refractory pipe, a smoke exhaust pipe and a heat exchange pipe, the hearth, the smoke exhaust pipe and the heat exchange pipe are positioned in the stove body, the burner is mounted at the bottom or on the side of the hearth, and the smoke exhaust pipe is arranged at the top of the hearth. The fire-resistant pipes are arranged on the inner side of the hearth and close to the top of the hearth, the multiple fire-resistant pipes are arranged below the smoke exhaust pipe, and the heat exchange pipe is communicated with the smoke exhaust pipe. The refractory pipe is arranged on the inner side, close to the top of the hearth, of the hearth, direct contact between most flames of the combustor and the top of the hearth is blocked, the top of the hearth is protected against high-temperature damage, the service life of the hot blast stove is effectively prolonged, the maintenance cost is reduced, and the drying efficiency is improved. Meanwhile, the device has the advantage of eliminating fire hazards.

Description

Technical Field

[0001] This utility model relates to the field of hot blast stove technology, specifically a hot blast stove with refractory tubes. Background Technology

[0002] Hot air drying is a commonly used method in various product drying industries. The performance of the hot air furnace, as the heat source for generating hot air, directly affects drying efficiency and quality. Currently, common hot air furnaces on the market include coal-fired hot air furnaces, biomass pellet hot air furnaces, and gas-fired hot air furnaces. Among them, biomass pellet hot air furnaces and gas-fired hot air furnaces are widely used due to their environmentally friendly and efficient characteristics.

[0003] However, the top of a traditional hot blast stove's furnace is easily damaged because it is directly exposed to the high-temperature flame. Although some hot blast stoves use refractory bricks for protection around the furnace perimeter and bottom, the top cannot be fitted with refractory bricks due to structural limitations, and must rely on thickened steel plates to withstand the high temperatures. However, even 20mm thick steel plates often cannot withstand prolonged exposure to high temperatures and may burn out within about a year, not only reducing the hot blast stove's lifespan but also increasing the fire hazard. Furthermore, replacing a damaged furnace top is quite troublesome, causing numerous inconveniences to production. Utility Model Content

[0004] The purpose of this invention is to provide a hot blast stove with refractory tubes to solve the problems of easy damage to the top of the furnace of traditional hot blast stoves, short service life, high maintenance costs, and fire hazards.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hot air furnace with refractory tubes, comprising a furnace body, a furnace chamber, a burner, refractory tubes, a flue pipe, and a heat exchange tube. The furnace chamber, flue pipe, and heat exchange tube are located inside the furnace body. One end of the furnace body is provided with an air inlet, and the opposite end is provided with a hot air outlet. The burner is installed at the bottom or side of the furnace chamber to burn fuel in the furnace chamber to generate a flame. The flue pipe is located at the top of the furnace chamber, and the refractory tube is located inside the furnace chamber and close to the top of the furnace chamber. Multiple refractory tubes are arranged below the flue pipe. The refractory tubes are used to block most of the flame of the burner from direct contact with the top of the furnace chamber. The flue pipe is used to discharge the flue gas generated by combustion. The heat exchange tube is connected to the flue pipe to transfer the heat in the flue gas to the air to generate hot air.

[0006] Based on the above technical solution, the present invention can be further improved as follows:

[0007] As a further improvement to the above technical solution, the refractory pipe includes an inner pipe body and a refractory material layer disposed on the outer peripheral wall of the inner pipe body. The inner pipe body is a seamless steel pipe with a wall thickness of 6mm, and the refractory material layer is a 30-40mm thick corundum refractory material formed by casting on the outer peripheral wall of the seamless steel pipe.

[0008] As a further improvement to the above technical solution, the plurality of refractory tubes are equidistant from each other and spaced apart from the flue pipe, and both ends of the refractory tubes are fixed to the inner side wall of the furnace.

[0009] As a further improvement to the above technical solution, the exhaust pipes are configured as multiple, and a heat exchange box is connected between the multiple exhaust pipes and the heat exchange pipes. The heat exchange pipes are configured as multiple groups, and each group of heat exchange pipes includes multiple heat exchange pipes. Two adjacent groups of heat exchange pipes are also connected to a heat exchange box, and the heat exchange box is connected to the heat exchange pipes and the exhaust pipes.

[0010] As a further improvement to the above technical solution, the heat exchange box and heat exchange tube are made of iron, aluminum or copper.

[0011] As a further improvement to the above technical solution, the furnace body is provided with a receiving cavity on the inside, the furnace chamber, the flue pipe and the heat exchange pipe are located in the receiving cavity of the furnace body, the inner wall of the furnace body is provided with a heat insulation plate, and the top of the furnace body is provided with a chimney that communicates with the heat exchange pipe.

[0012] As a further improvement to the above technical solution, the furnace is made of refractory bricks, and an inlet is provided on one side of the furnace. The burner is installed at the inlet of the furnace, and the fuel in the furnace is biomass pellets or gas.

[0013] As a further improvement to the above technical solution, the heat exchange tube is provided with multiple fins, the fins being made of iron, aluminum, or copper.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting up refractory tubes, most of the flames of the burner are blocked from direct contact with the top of the furnace, allowing the flames to directly contact the refractory material layer of the refractory tubes, thereby effectively protecting the top of the furnace from high-temperature damage.

[0016] 2. Because the refractory material layer of the refractory tube can withstand the long-term exposure to high-temperature flames without being easily damaged, the number of repairs and replacements due to damage to the top of the furnace is reduced, thus reducing maintenance costs and extending the service life of the hot blast stove.

[0017] 3. The high-temperature flue gas generated by the burner flame heats the refractory tubes. The high-temperature flue gas passes through the refractory tubes, the exhaust pipe, and the heat exchange box in sequence before entering the heat exchange tubes. It then exchanges heat with the air in the furnace through the heat exchange tubes. The heat in the flue gas can be transferred to the air more efficiently, which helps to improve the drying efficiency of the hot air furnace.

[0018] 4. Because the refractory material layer of the refractory tube has excellent high temperature resistance, and by setting multiple refractory tubes, most of the flame of the burner can be blocked from direct contact with the top of the furnace, thus effectively preventing fire hazards caused by the burning of the top of the furnace. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of a hot blast stove with refractory tubes provided in a preferred embodiment of the present invention;

[0021] Figure 2 yes Figure 1 View of the furnace along direction F;

[0022] Figure 3 yes Figure 2 A top view of the refractory pipe in the middle;

[0023] Figure 4 yes Figure 1 Cross-sectional view of the refractory pipe in the middle;

[0024] In the diagram: 1. Furnace body; 11. Air inlet; 12. Hot air outlet; 2. Furnace chamber; 21. Refractory brick; 22. Fire inlet; 3. Burner; 4. Exhaust pipe; 5. Heat exchanger pipe; 6. Refractory pipe; 61. Inner tube; 62. Refractory material layer; 7. Heat exchange box; 8. Chimney. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 4 As shown, a preferred embodiment of this utility model provides a hot blast stove with refractory tubes, including a furnace body 1, a furnace chamber 2, a burner 3, refractory tubes 6, a flue pipe 4, and a heat exchange pipe 5. The furnace chamber 2, the flue pipe 4, and the heat exchange pipe 5 are located inside the furnace body 1. The burner 3 is installed at the bottom or side of the furnace chamber 2 to burn fuel in the furnace chamber 2 to generate a flame. The flue pipe 4 is located at the top of the furnace chamber 2 (e.g., at the top). Figure 1 (Position A in the diagram) The refractory tube 6 is located inside the furnace 2 and close to the top of the furnace 2. Multiple refractory tubes 6 are provided for both the flue pipe 4 and the flue pipe 6. These multiple refractory tubes 6 are arranged below the flue pipe 4. The refractory tube 6 is used to block most of the flame of the burner 3 from direct contact with the top of the furnace 2. The flue pipe 4 is used to discharge the flue gas generated by combustion. The heat exchange tube 5 is connected to the flue pipe 4 and is used to transfer the heat in the flue gas to the air to generate hot air.

[0029] Specifically, the furnace body 1 has an inner cavity, within which the furnace chamber 2, exhaust pipe 4, and heat exchange pipe 5 are located. The inner wall of the furnace body 1 is provided with an insulation board for heat preservation. One end of the furnace body 1 has an air inlet 11, and the opposite end has a hot air outlet 12. Outside air enters the furnace body 1 through the air inlet 11 and exchanges heat with the heat exchange pipe 5. The heated air is then discharged from the hot air outlet 12. Figure 1 The arrows in the diagram indicate the wind direction. A chimney 8, which is connected to the heat exchange tubes 5, is located at the top of the furnace body 1, and the flue gas generated during combustion is discharged through the chimney 8.

[0030] Specifically, in this embodiment, the furnace chamber 2 is made of refractory bricks 21, and a fire inlet 22 is provided on one side of the furnace chamber 2. The burner 3 is installed in the fire inlet 22 of the furnace chamber 2. The fuel in the furnace chamber 2 can be biomass pellets or gas.

[0031] Preferably, a heat exchange box 7 is connected between the heat exchange tube 5 and the plurality of exhaust pipes 4. The heat exchange tube 5 is configured in multiple groups, and each group of heat exchange tubes 5 includes multiple heat exchange tubes 5. Two adjacent groups of heat exchange tubes 5 are also connected to a heat exchange box 7. The heat exchange box 7 is connected to the heat exchange tube 5 and the exhaust pipes 4. The heat exchange box 7 and the heat exchange tube 5 can be made of iron, aluminum or copper. By setting multiple groups of heat exchange tubes 5 and heat exchange boxes 7, the contact area with air is increased.

[0032] Preferably, the plurality of refractory tubes 6 are equidistant from each other and spaced a certain distance from the flue pipe 4. The two ends of the refractory tubes 6 are fixed to the inner sidewall of the furnace 2. The refractory tube 6 includes an inner tube body 61 and a refractory material layer 62 disposed on the outer peripheral wall of the inner tube body 61. The inner tube body 61 is a seamless steel pipe with a wall thickness of 6mm. The refractory material layer 62 is a 30-40mm thick corundum refractory material formed by casting on the outer peripheral wall of the seamless steel pipe. The corundum refractory material can withstand high temperatures above 1300 degrees Celsius and is corrosion-resistant. It can withstand long-term exposure to high-temperature flames without being easily damaged.

[0033] Furthermore, in order to improve heat transfer efficiency, the heat exchange tube 5 is provided with multiple fins. The fins can be made of iron, aluminum or copper. The fins can increase the contact area between the heat exchange tube 5 and the air. At the same time, the fins can also play a turbulence role, causing the air to form turbulence around the heat exchange tube 5, which further improves the heat transfer efficiency.

[0034] When this utility model is in use, when the burner 3 injects flame into the furnace 2, the flame first contacts the refractory material layer 62 of the refractory tube 6, rather than directly contacting the top of the furnace 2. The flame combustion generates high-temperature flue gas, which heats the refractory tube 6, causing the refractory tube 6 to absorb the heat of the flue gas and reach a high temperature of over 1300 degrees Celsius. The high-temperature flue gas passes through the refractory tube 6, the exhaust pipe 4, and the heat exchange box 7 in sequence and enters the heat exchange tube 5. Then, it exchanges heat with the air in the furnace body 1 through the heat exchange tube 5. The air in the furnace body 1 is heated and forms hot air, which is discharged from the hot air outlet 12. After heat exchange, the flue gas is discharged from the chimney 8.

[0035] In summary, the hot blast stove with refractory tubes provided by this utility model, by installing refractory tubes 6 inside the furnace 2 near the top of the furnace 2, blocks most of the flame of the burner 3 from direct contact with the top of the furnace 2, protecting the top of the furnace 2 from high-temperature damage, effectively extending the service life of the hot blast stove, reducing maintenance costs, and improving drying efficiency. At the same time, this utility model also has the advantage of eliminating fire hazards, and has broad market application prospects and promotional value.

[0036] Any descriptions not covered in the above specific embodiments of this utility model belong to the well-known technology in the field, and can be implemented by referring to the well-known technology.

[0037] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hot blast stove with a refractory tube, characterized in that: The furnace includes a furnace body, furnace chamber, burner, refractory tubes, flue pipe, and heat exchange tubes. The furnace chamber, flue pipe, and heat exchange tubes are located inside the furnace body. One end of the furnace body has an air inlet, and the opposite end has a hot air outlet. The burner is installed at the bottom or side of the furnace chamber to burn fuel in the furnace chamber to produce a flame. The flue pipe is located at the top of the furnace chamber, and the refractory tubes are located inside the furnace chamber and close to the top of the furnace chamber. Multiple refractory tubes are arranged below the flue pipe. The refractory tubes are used to block most of the burner flame from direct contact with the top of the furnace chamber. The flue pipe is used to discharge the flue gas generated by combustion. The heat exchange tubes are connected to the flue pipe and are used to transfer the heat in the flue gas to the air to generate hot air.

2. Hot blast stove with refractory tube according to claim 1, characterized in that The refractory pipe includes an inner pipe body and a refractory material layer on the outer peripheral wall of the inner pipe body. The inner pipe body is a seamless steel pipe with a wall thickness of 6mm, and the refractory material layer is a 30-40mm thick corundum refractory material formed by casting on the outer peripheral wall of the seamless steel pipe.

3. Hot blast stove with refractory tube according to claim 2, characterized in that: The plurality of refractory tubes are equidistant from each other and spaced apart from the flue pipe, and both ends of the refractory tubes are fixed to the inner side wall of the furnace.

4. Hot blast stove with refractory tube according to claim 3, characterized in that: The exhaust pipes are configured as multiple, and a heat exchange box is connected between the multiple exhaust pipes and the heat exchange pipes. The heat exchange pipes are configured as multiple groups, and each group of heat exchange pipes includes multiple heat exchange pipes. Two adjacent groups of heat exchange pipes are also connected to a heat exchange box, and the heat exchange box is connected to the heat exchange pipes and the exhaust pipes.

5. Hot blast stove with refractory tube according to claim 4, characterized in that The heat exchange box and heat exchange tubes are made of iron, aluminum or copper.

6. The hot blast stove with refractory tube according to claim 4, characterized in that: The furnace body has a accommodating cavity on its inner side, and the furnace chamber, exhaust pipe and heat exchange pipe are located in the accommodating cavity of the furnace body. The inner wall of the furnace body is provided with a heat insulation plate, and the top of the furnace body is provided with a chimney that communicates with the heat exchange pipe.

7. Hot blast stove with refractory tube according to claim 6, characterized in that The furnace chamber is made of refractory bricks, and an inlet is provided on one side of the furnace chamber. The burner is installed at the inlet of the furnace chamber, and the fuel in the furnace chamber is biomass pellets or gas.

8. Hot blast stove with refractory tube according to claim 7, characterized in that The heat exchange tube is provided with multiple fins, which are made of iron, aluminum or copper.

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