A hot blast stove

Abstract

The utility model relates to energy technology field especially relates to a hot blast furnace. Including the casing, be equipped with hearth in the casing, the hearth is installed through the grate support and has the grate, the casing one side is equipped with the air distribution device and the feeding device connected with the hearth, the hearth top is connected with the heat exchange pipeline system through the flue gas passage, the heat exchange pipeline system end top casing is equipped with the flue gas outlet, the flue gas outlet place installs the induced draft fan, the casing corresponds the heat exchange pipeline system end one side is the cold air import, the hearth top casing is equipped with the hot blast outlet, the hearth side wall upper portion installs the exhaust pipe, the bottom of exhaust pipe reaches the flue gas passage below, the top of exhaust pipe reaches the hot blast outlet place, and the exhaust pipe is used for the heat of flue gas passage below to discharge to the hot blast outlet. Avoid the heat to accumulate here and form high temperature influence component life, eliminate the hidden danger.

Description

Technical Field

[0001] This utility model relates to the field of energy technology, and in particular to a hot air furnace. Background Technology

[0002] Currently, a hot air furnace is a device that converts incoming cold air into outgoing hot air through heat exchange. The resulting hot air can be used for drying or heating. Traditional hot air furnaces generally adopt a multi-layer nested structure. The heat exchange area of ​​this structure is limited by the furnace size. If the furnace is enlarged, the equipment will be too tall, making installation inconvenient, and the thermal efficiency will be low, generally only reaching 70% to 75%. Later, hot air furnaces that use heat exchange pipelines for heat exchange appeared on the market. By exchanging heat with high-temperature flue gas, the heat exchange effect is no longer limited by the furnace size, the overall size is reduced, and the thermal efficiency can be increased to over 85%. When this type of hot air furnace is working, biomass fuel is generally input into the furnace, which is ignited to produce high-temperature flue gas. The high-temperature flue gas enters the heat exchange pipeline through the flue gas channel and exchanges heat with the external cold air. The entire equipment is sealed by a shell. The flue gas after heat exchange is discharged from the exhaust port through the induced draft fan, while the hot air is discharged from the air outlet. In actual operation, this type of hot air furnace also has the following problems: First, because the equipment is completely sealed, the hot air can only be discharged from the outlet along a predetermined route inside. The area below the flue gas passage inside the equipment is prone to forming a windless zone, which prevents heat from being discharged in time. Heat tends to accumulate here, forming high temperatures, affecting the lifespan of components and creating safety hazards. Second, when biomass fuel is transported into the furnace, the flame tends to burn outwards along the fuel until it reaches the conveying auger, creating safety hazards. Moreover, biomass fuel tends to accumulate after entering the furnace, affecting combustion efficiency. Currently, there is no good way to solve the above problems.

[0003] In summary, eliminating the safety hazards of hot blast stoves during operation has become a pressing technical challenge for the industry. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a hot air furnace that solves the problems of excessive height, inconvenient installation, and low thermal efficiency of previous hot air furnaces. It also solves the problem that heat tends to accumulate and form high temperatures in the area below the flue gas passage of previous hot air furnaces.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A hot blast stove includes a shell, within which a furnace chamber is provided. A grate is installed in the furnace chamber via a grate support. An air distribution device and a feeding device connected to the furnace chamber are installed on one side of the shell. The top of the furnace chamber is connected to a heat exchange pipeline system via a flue gas passage. A flue gas outlet is provided on the top of the shell at the end of the heat exchange pipeline system, and an induced draft fan is installed at the flue gas outlet. A cold air inlet is located on the side of the shell corresponding to the end of the heat exchange pipeline system. A hot air outlet is provided on the top of the shell at the top of the furnace chamber. An exhaust pipe is installed on the upper part of the side wall of the furnace chamber, with its bottom extending below the flue gas passage and its top extending to the hot air outlet. The exhaust pipe is used to discharge the heat below the flue gas passage to the hot air outlet.

[0006] The feeding device includes a feeding pipe connected to a hopper. A feeding auger is installed inside the feeding pipe. One end of the feeding auger leads to the furnace, and the other end is connected to a feeding motor.

[0007] The air distribution device includes a fan, the outlet of which is connected to an air tank. The first outlet of the air tank is connected to the ignition rod tube inside the furnace via a hose, the second outlet is connected to the air blowing pipe on the side of the feeding pipe via a hose, and the third outlet is connected to the air blowing port below the feeding pipe via a hose.

[0008] The heat exchange pipeline system includes several vertically spaced heat exchange tubes A, B, C, and D. The top of heat exchange tube A is connected to the flue gas passage, the bottom of heat exchange tube A is connected to the bottom of heat exchange tube B through a first lower cavity, the top of heat exchange tube B is connected to the top of heat exchange tube C through an upper cavity, the bottom of heat exchange tube C is connected to the bottom of heat exchange tube D through a second lower cavity, and the top of heat exchange tube D is connected to the flue gas outlet.

[0009] The wall thickness of heat exchanger tubes A, B, C, and D decreases sequentially.

[0010] The flue gas passage and the top of the upper cavity, as well as the front sides of the first and second lower cavities, are respectively provided with sealing covers that can be opened or closed.

[0011] Several heat dissipation fins are installed on the side wall of the furnace.

[0012] The exhaust pipe is welded and fixed to the heat dissipation fins.

[0013] A protective net is installed at the cold air inlet.

[0014] An observation port and an ash removal port are provided on the front side of the furnace.

[0015] The present invention adopts the above solution and has the following beneficial effects: By adopting a heat exchange pipeline system to exchange heat with high-temperature flue gas, the high-temperature flue gas travels in an S-shape, which can reduce volume, extend travel distance, and increase heat exchange area. It is not limited by the size of the furnace. The whole equipment is small in size, compact in structure, and easy to install. The high-temperature flue gas can fully exchange heat with cold air, improve fuel utilization, and increase thermal efficiency to over 85%.

[0016] By installing an exhaust pipe on the upper part of the furnace side wall, with the bottom of the exhaust pipe extending below the flue gas passage and the top of the exhaust pipe extending to the hot air outlet, the exhaust pipe can discharge the heat below the flue gas passage to the hot air outlet, preventing heat from accumulating here and forming high temperatures that affect the life of components, thus eliminating safety hazards.

[0017] By connecting the second outlet of the gas tank to the air blower on the side of the feeding pipe via a hose, the flames can be prevented from extending outwards along the fuel while the biomass fuel is blown into the furnace, thus protecting the auger and the feeding motor and eliminating safety hazards. In addition, by connecting the third outlet of the gas tank to the air blower below the feeding pipe via a hose, the biomass fuel can be dispersed in the air as it falls into the furnace, preventing it from accumulating after entering the furnace and improving combustion efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal forward three-dimensional structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the internal rear-facing three-dimensional structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the rearward installation structure of the exhaust pipe of this utility model on the furnace.

[0023] In the diagram, 1. Shell, 2. Furnace chamber, 3. Grate support, 4. Grate, 5. Flue gas passage, 6. Exhaust port, 7. Cold air inlet, 8. Hot air outlet, 9. Exhaust pipe, 10. Feeding pipe, 11. Hopper, 12. Feeding auger, 13. Feeding motor, 14. Fan, 15. Air tank, 16. First outlet, 17. Ignition rod tube, 18. Second outlet, 19. Blowing pipe, 20. Third outlet, 21. Blowing port, 22. Heat exchanger tube A, 23. Heat exchanger tube B, 24. Heat exchanger tube C, 25. Heat exchanger tube D, 26. First lower cavity, 27. Upper cavity, 28. Second lower cavity, 29. Sealing cover, 30. Heat dissipation fins, 31. Protective net, 32. Observation port, 33. Ash removal port. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0025] like Figure 1-5 As shown, a hot blast stove includes a shell 1, a furnace chamber 2 inside the shell 1, a grate 4 installed inside the furnace chamber 2 via a grate support 3, an air distribution device and a feeding device connected to the furnace chamber 2 installed on one side of the shell 1, the top of the furnace chamber 2 connected to a heat exchange pipeline system via a flue gas passage 5, a flue gas outlet 6 on the top of the shell 1 at the end of the heat exchange pipeline system, an induced draft fan installed at the flue gas outlet 6, a cold air inlet 7 on the side of the shell 1 corresponding to the end of the heat exchange pipeline system, a hot air outlet 8 on the top of the shell 1 at the top of the furnace chamber 2, and an exhaust pipe 9 installed on the upper part of the side wall of the furnace chamber 2, the bottom of the exhaust pipe 9 extending below the flue gas passage 5 and the top of the exhaust pipe 9 extending to the hot air outlet 8, the exhaust pipe 9 being used to discharge the heat below the flue gas passage 5 to the hot air outlet 8.

[0026] The feeding device includes a feeding pipe 10, which is connected to a hopper 11. A feeding auger 12 is installed inside the feeding pipe 10. One end of the feeding auger 12 leads to the furnace 2, and the other end is connected to a feeding motor 13. The hopper 11 is funnel-shaped, and biomass fuel can be added into the hopper 11. When the feeding motor 13 is working, it drives the feeding auger 12 to rotate, and the feeding auger 12 can feed the biomass fuel into the furnace 2.

[0027] The air distribution device includes a blower 14, the outlet of which is connected to an air tank 15. The first outlet 16 of the air tank 15 is connected to the ignition rod tube 17 inside the furnace 2 via a hose, and is used to distribute air when the ignition rod is ignited. The second outlet 18 is connected to the air blowing pipe 19 on the side of the feeding pipe 10 via a hose. While blowing biomass fuel into the furnace 2, it can prevent the flame from extending outward along the fuel, thus protecting the feeding auger 12 and the feeding motor 13 and eliminating safety hazards. The third outlet 20 is connected to the air blowing port 21 below the feeding pipe 10 via a hose. During the process of biomass fuel falling into the furnace 2, it can disperse the biomass fuel in the air, preventing the biomass fuel from accumulating after entering the furnace 2 and improving combustion efficiency.

[0028] The heat exchange pipeline system includes several vertically spaced heat exchange tubes A22, B23, C24, and D25. The top of heat exchange tube A22 is connected to the flue gas passage 5, the bottom of heat exchange tube A22 is connected to the bottom of heat exchange tube B23 through the first lower cavity 26, the top of heat exchange tube B23 is connected to the top of heat exchange tube C24 through the upper cavity 27, the bottom of heat exchange tube C24 is connected to the bottom of heat exchange tube D25 through the second lower cavity 28, and the top of heat exchange tube D25 is connected to the flue gas outlet 6. The high-temperature flue gas in the furnace 2 enters the heat exchange tube A22, the first lower cavity 26, the heat exchange tube B23, the upper cavity 27, the heat exchange tube C24, the second lower cavity 28, and the heat exchange tube D24 in sequence after passing through the flue gas passage 5, and finally exits from the exhaust port 6. The high-temperature flue gas travels in an S-shape, which can extend the travel distance and fully exchange heat with the cold air.

[0029] The wall thicknesses of the heat exchange tubes A22, B23, C24, and D25 decrease sequentially to match the different temperatures of the high-temperature flue gas.

[0030] The flue gas passage 5 and the top of the upper cavity 27, and the front sides of the first lower cavity 26 and the second lower cavity 28 are respectively provided with sealing covers 29 that can be opened or closed, and the sealing covers 29 can be opened to clean the soot.

[0031] Several heat dissipation fins 30 are installed on the side wall of the furnace chamber 2, which can improve the heat dissipation efficiency of the furnace chamber 2.

[0032] The exhaust pipe 9 is welded and fixed to the heat dissipation fins 30.

[0033] The cold air inlet 7 is equipped with a protective net 31 to protect the internal heat exchange tube D25.

[0034] The furnace chamber 2 is provided with an observation port 32 and an ash removal port 33 on the front side.

[0035] Working principle: During operation, the feeding motor 13 starts, driving the feeding auger 12 inside the feeding pipe 10 to rotate. The feeding auger 12 can feed biomass fuel into the furnace 2. At the same time, the blower 14 is started. The air blown by the blower 14 first enters the gas tank 15. The first outlet 16 of the gas tank 15 is connected to the ignition rod tube 17 in the furnace 2 through a hose. It is used to supply air to ignite the fuel when the ignition rod is ignited. When the fuel burns, high-temperature flue gas is generated in the furnace 2. Under the action of the induced draft fan at the flue gas outlet 6, the high-temperature flue gas first enters the flue gas passage 5 from the furnace 2, and then sequentially enters the heat exchange tube A22 and the first lower cavity 26. Heat exchange tube B23, upper cavity 27, heat exchange tube C24, second lower cavity 28, and heat exchange tube D24 are discharged from the flue gas outlet 6. Meanwhile, cold air, under the action of the induced draft fan at the hot air outlet 8, enters sequentially from the cold air inlet 7 into the gap between heat exchange tubes D25, C24, B23, and A22 for heat exchange, turning the cold air into hot air. Finally, it is discharged from the hot air outlet 8 for drying or heating. The heat below the flue gas passage 5 can be discharged to the hot air outlet 8 through the exhaust pipe 9, avoiding the accumulation of heat at this point and the formation of high temperatures that could affect the lifespan of the components, thus eliminating safety hazards.

[0036] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0037] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A hot air furnace, characterized in that: The device includes a shell, within which a furnace chamber is located. A grate is installed inside the furnace chamber via a grate support. An air distribution device and a feeding device connected to the furnace chamber are installed on one side of the shell. The top of the furnace chamber is connected to a heat exchange pipeline system via a flue gas passage. A flue gas outlet is located on the top of the shell at the end of the heat exchange pipeline system, and an induced draft fan is installed at the flue gas outlet. A cold air inlet is located on the side of the shell corresponding to the end of the heat exchange pipeline system. A hot air outlet is located on the top of the shell at the top of the furnace chamber. An exhaust pipe is installed on the upper part of the side wall of the furnace chamber. The bottom of the exhaust pipe extends below the flue gas passage, and the top of the exhaust pipe extends to the hot air outlet. The exhaust pipe is used to discharge the heat below the flue gas passage to the hot air outlet.

2. A hot air furnace according to claim 1, characterized in that: The feeding device includes a feeding pipe connected to a hopper. A feeding auger is installed inside the feeding pipe. One end of the feeding auger leads to the furnace, and the other end is connected to a feeding motor.

3. A hot air furnace according to claim 2, characterized in that: The air distribution device includes a fan, the outlet of which is connected to an air tank. The first outlet of the air tank is connected to the ignition rod tube inside the furnace via a hose, the second outlet is connected to the air blowing pipe on the side of the feeding pipe via a hose, and the third outlet is connected to the air blowing port below the feeding pipe via a hose.

4. A hot air furnace according to claim 1, characterized in that: The heat exchange pipeline system includes several vertically spaced heat exchange tubes A, B, C, and D. The top of heat exchange tube A is connected to the flue gas passage, the bottom of heat exchange tube A is connected to the bottom of heat exchange tube B through a first lower cavity, the top of heat exchange tube B is connected to the top of heat exchange tube C through an upper cavity, the bottom of heat exchange tube C is connected to the bottom of heat exchange tube D through a second lower cavity, and the top of heat exchange tube D is connected to the flue gas outlet.

5. A hot air furnace according to claim 4, characterized in that: The wall thickness of heat exchanger tubes A, B, C, and D decreases sequentially.

6. A hot air furnace according to claim 4, characterized in that: The flue gas passage and the top of the upper cavity, as well as the front sides of the first and second lower cavities, are respectively provided with sealing covers that can be opened or closed.

7. A hot air furnace according to claim 1, characterized in that: Several heat dissipation fins are installed on the side wall of the furnace.

8. A hot air furnace according to claim 7, characterized in that: The exhaust pipe is welded and fixed to the heat dissipation fins.

9. A hot air furnace according to claim 1, characterized in that: A protective net is installed at the cold air inlet.

10. A hot air furnace according to claim 1, characterized in that: An observation port and an ash removal port are provided on the front side of the furnace.

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