Air heating furnace

Abstract

The utility model provides an air heating furnace, and relates to the technical field of heating furnaces, the air heating furnace comprises an outer shell and an inner shell, an air heating cavity is arranged between the outer shell and the inner shell, the outer shell is provided with a cold air input pipe and a hot air output pipe which are communicated with the air heating cavity, and the outer shell is fixedly provided with a fuel spraying and burning pipeline for installing a fuel spraying and burning gun; the fuel spraying and burning pipeline extends into the inner shell, an ash removal assembly is arranged in the inner shell, the outer shell is provided with a driving motor used for driving the ash removal assembly to rotate, the inner shell is provided with a smoke exhaust pipeline and an ash discharge pipeline, the smoke exhaust pipeline and the ash discharge pipeline both extend out of the outer shell, and an ash discharge valve and an ash discharge fan are sequentially arranged on the ash discharge pipeline in the ash discharge direction. The driving motor drives the ash removal assembly to rotate, the ash removal pipe is connected with the ash treatment equipment, accumulated ash on the inner wall of the inner shell can be removed regularly, and the ash removed from the inner wall of the inner shell is conveyed to the ash treatment equipment under the action of the ash removal fan. And heat transfer efficiency and normal operation of a heating furnace system are prevented from being affected by accumulated dust on the inner wall of the inner shell.

Description

Technical Field

[0001] This application relates to the field of heating furnace technology, and more specifically, to an air heating furnace. Background Technology

[0002] In the production of silica, the raw materials often need to be heated. For example, when silica is produced using quartz sand as the main raw material, the heat generated by the furnace is used to heat the air, forming hot air. The hot air is then transported through pipes to a drying device to dry the quartz sand, removing moisture and facilitating subsequent processing, thereby improving production efficiency and product quality.

[0003] Inside the furnace of a heating furnace, when pulverized coal is used as fuel, some of the ash produced by combustion is discharged from the furnace with the flue gas, but some adheres to the furnace walls and heating surfaces, forming ash deposits. These ash deposits thicken over time. Ash deposits not only reduce the heat transfer efficiency of the heating surfaces, but their uneven distribution can also lead to temperature differences in different parts of the heating surfaces, thus affecting the stability and safety of the entire heating furnace system. Summary of the Invention

[0004] The purpose of this application is to provide an air heating furnace that can solve the technical problems of existing heating furnaces where ash buildup in the furnace chamber reduces the heat transfer efficiency of the heating surface, and uneven distribution of ash on the heating surface leads to temperature differences in different parts, thereby affecting the stability and safety of the heating furnace system.

[0005] This application provides an air heating furnace, including an outer shell and an inner shell, with an air heating chamber between the outer shell and the inner shell. The outer shell is provided with a cold air input pipe and a hot air output pipe communicating with the air heating chamber. A fuel injection pipe for mounting a fuel injection gun is fixed on the outer shell, and the fuel injection pipe extends into the inner shell. A ash removal assembly is provided in the inner shell, and the outer shell is provided with a drive motor for driving the ash removal assembly to rotate. A flue gas pipe and an ash removal pipe are provided on the inner shell, both of which extend outside the outer shell. An ash removal valve and an ash removal fan are sequentially provided on the ash removal pipe along the ash removal direction.

[0006] Furthermore, the dust removal assembly includes a rotating shaft and a dust removal rod. The rotating shaft is rotatably disposed inside the inner shell. One end of the rotating shaft extends to the outside of the outer shell and is connected to the output shaft of the drive motor. The other end of the rotating shaft is connected to the dust removal rod, and the dust removal rod abuts against the inner wall of the inner shell.

[0007] Furthermore, there are two cleaning rods, which are symmetrically arranged. A connecting ring is movably sleeved on the inner end of the fuel injection pipe, and the end of the cleaning rod away from the rotating shaft is fixedly connected to the connecting ring.

[0008] Furthermore, a baffle is provided between the two cleaning rods, and the baffle is fixed on the rotating shaft.

[0009] Furthermore, a sleeve is provided inside the air heating chamber. One end of the sleeve is connected to the outer wall of the inner shell, and the other end of the sleeve is connected to the inner wall of the outer shell. The sleeve is fitted onto the rotating shaft, and a sealing ring is provided between the sleeve and the rotating shaft.

[0010] Furthermore, the outer end of the fuel injection pipe is provided with an installation flange.

[0011] Furthermore, the air heating chamber is provided with a heat exchange coil, which is coiled on the inner shell, and the water inlet and outlet of the heat exchange coil both extend to the outside of the outer shell.

[0012] The beneficial effects of this utility model are:

[0013] This invention uses a drive motor to drive the dust removal assembly to rotate, and the ash discharge pipe is connected to the dust treatment equipment. It can periodically clean the ash accumulated on the inner wall of the inner shell. The dust cleaned off the inner wall of the inner shell is transported to the dust treatment equipment under the action of the ash discharge fan, preventing the heat transfer efficiency and the normal operation of the entire heating furnace system from being affected by the ash accumulation on the inner wall of the inner shell. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 These are schematic diagrams of structures in some embodiments of this application;

[0016] Figure 2 These are cross-sectional views of some embodiments of this application;

[0017] The reference numerals in the attached figures are as follows:

[0018] 1. Outer shell; 2. Inner shell; 3. Air heating chamber; 4. Cold air inlet pipe; 5. Hot air outlet pipe; 6. Fuel injection pipe; 7. Ash removal assembly; 71. Rotating shaft; 72. Ash removal rod; 8. Drive motor; 9. Exhaust pipe; 10. Ash removal pipe; 11. Ash removal valve; 12. Ash removal fan; 13. Connecting ring; 14. Baffle; 15. Sleeve; 16. Sealing ring; 17. Mounting flange; 18. Heat exchange coil. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 application based on the specific circumstances. Specific implementation examples:

[0026] like Figure 1 and Figure 2 As shown, this application provides an air heating furnace, including an outer shell 1 and an inner shell 2. An air heating chamber 3 is provided between the outer shell 1 and the inner shell 2. The outer shell 1 is provided with a cold air inlet pipe 4 and a hot air outlet pipe 5 communicating with the air heating chamber 3. A fuel injection pipe 6 for mounting a fuel injection gun is fixed on the outer shell 1. The fuel injection pipe 6 extends into the inner shell 2. A ash removal assembly 7 is provided inside the inner shell 2. The outer shell 1 is provided with a drive motor 8 for driving the ash removal assembly 7 to rotate. An exhaust pipe 9 and an ash removal pipe 10 are provided on the inner shell 2. Both the exhaust pipe 9 and the ash removal pipe 10 extend outside the outer shell 1. An ash removal valve 11 and an ash removal fan 12 are sequentially provided on the ash removal pipe 10 along the ash removal direction. In use, the ash removal pipe is connected to a dust treatment device, and the fuel injection gun... Installed on the fuel injection pipe 6, the fuel injection gun's nozzle is inserted into the inner shell 2. Fuel is injected into the inner shell 2 through the fuel injection gun and burned. At the same time, cold air enters the air heating chamber 3 from the cold air inlet pipe 4. The cold air absorbs the heat generated by the fuel combustion in the inner shell 2 in the air heating chamber 3, and is heated into hot air, which is then discharged from the hot air outlet pipe 5. The ash generated by the combustion of pulverized coal fuel adheres to the inner wall of the inner shell 2 and is scraped off by the ash removal component 7 driven by the drive motor 8. The flue gas generated by the fuel combustion is discharged through the exhaust pipe 9. The ash scraped off by the ash discharge valve 11 and the ash discharge fan 12 is discharged to the dust treatment equipment through the ash discharge pipe 10, effectively preventing the heat transfer efficiency and the normal operation of the entire heating furnace system from being affected by the ash accumulation on the inner wall of the inner shell 2.

[0027] like Figure 2 As shown, the dust removal assembly 7 includes a rotating shaft 71 and a dust removal rod 72. The rotating shaft 71 is rotatably disposed inside the inner shell 2. One end of the rotating shaft 71 extends to the outside of the outer shell 1 and is connected to the output shaft of the drive motor 8. The other end of the rotating shaft 71 is connected to the dust removal rod 72. The dust removal rod 72 abuts against the inner wall of the inner shell 2. The rotating shaft 71 is driven to rotate by the drive motor 8, and the rotating shaft 71 drives the dust removal rod 72 to clean the inner wall of the inner shell 2, effectively preventing the accumulation of ash on the inner wall of the inner shell 2, ensuring the cleanliness of the inside of the inner shell 2, and maintaining the good thermal conductivity of the inner shell 2.

[0028] like Figure 2As shown, there are two cleaning rods 72, which are symmetrically arranged. A connecting ring 13 is movably sleeved on the inner end of the fuel injection pipe 6. The end of the cleaning rod 72 away from the rotating shaft 71 is fixedly connected to the connecting ring 13. The connecting ring 13 serves to fix the cleaning rod 72, so that the cleaning rod 72 has a stable support point during rotation, which enhances the structural strength of the cleaning rod 72. Compared with a single cleaning rod 72, two cleaning rods 72 can effectively improve the cleaning efficiency.

[0029] like Figure 2 As shown, a baffle 14 is provided between the two cleaning rods 72. The baffle 14 is fixed on the rotating shaft 71 and is arranged opposite to the fuel injection pipe 6. When the fuel injection gun injects fuel, the flame and high-temperature airflow will generate a strong impact force. The baffle 14 can effectively block this force that directly impacts the inner wall of the inner shell 2, and prevent the local area of ​​the inner shell 2 from being deformed or damaged due to long-term strong thermal shock, thus extending the service life of the device.

[0030] like Figure 2 As shown, a sleeve 15 is provided inside the air heating chamber 3. One end of the sleeve 15 is connected to the outer wall of the inner shell 2, and the other end of the sleeve 15 is connected to the inner wall of the outer shell 1. The sleeve 15 is sleeved on the rotating shaft 71. A sealing ring 16 is provided between the sleeve 15 and the rotating shaft 71 to enhance the sealing between the rotating shaft 71 and the sleeve 15 and prevent the ash generated during the cleaning process from entering the air heating chamber 3 through the gap between the rotating shaft 71 and the sleeve 15.

[0031] like Figure 1 and Figure 2 As shown, the outer end of the fuel injection pipe 6 is provided with a mounting flange 17. The mounting flange 17 provides a standard connection interface for the installation of the fuel injection gun. By using bolts and nuts to cooperate with the mounting flange 17, the fuel injection gun can be easily installed onto the fuel injection pipe 6. The fuel injection gun has a flange, which is existing technology and will not be described in detail here.

[0032] like Figure 2 As shown, the air heating chamber 3 is equipped with a heat exchange coil 18, which is coiled on the inner shell 2. The water inlet and outlet of the heat exchange coil 18 extend to the outside of the outer shell 1. The fluid heated by the heat exchange coil 18 can be recycled and reused. For example, the heated hot water can be used in other processes that require preheating, thereby realizing multi-stage utilization of heat, giving full play to the value of energy, and improving the overall energy utilization rate of the equipment.

[0033] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An air heating furnace, characterized in that: The device includes an outer shell and an inner shell, with an air heating chamber between the outer shell and the inner shell. The outer shell is provided with a cold air inlet pipe and a hot air outlet pipe communicating with the air heating chamber. A fuel injection pipe for mounting a fuel injection gun is fixed on the outer shell. The fuel injection pipe extends into the inner shell. A ash removal assembly is provided inside the inner shell. The outer shell is provided with a drive motor for driving the ash removal assembly to rotate. A smoke exhaust pipe and an ash discharge pipe are provided on the inner shell. Both the smoke exhaust pipe and the ash discharge pipe extend outside the outer shell. An ash discharge valve and an ash discharge fan are sequentially provided on the ash discharge pipe along the ash discharge direction.

2. An air heating furnace according to claim 1, characterized in that: The dust removal assembly includes a rotating shaft and a dust removal rod. The rotating shaft is rotatably disposed inside the inner shell. One end of the rotating shaft extends to the outside of the outer shell and is connected to the output shaft of the drive motor. The other end of the rotating shaft is connected to the dust removal rod, and the dust removal rod abuts against the inner wall of the inner shell.

3. An air heating furnace according to claim 2, characterized in that: Two cleaning rods are provided, and the two cleaning rods are arranged symmetrically. A connecting ring is movably sleeved on the inner end of the fuel injection pipe, and the end of the cleaning rod away from the rotating shaft is fixedly connected to the connecting ring.

4. An air heating furnace according to claim 3, characterized in that: A baffle is provided between the two cleaning rods, and the baffle is fixed on the rotating shaft.

5. An air-heating furnace according to claim 2, characterized in that: The air heating chamber is provided with a sleeve, one end of which is connected to the outer wall of the inner shell, and the other end of which is connected to the inner wall of the outer shell. The sleeve is fitted onto the rotating shaft, and a sealing ring is provided between the sleeve and the rotating shaft.

6. An air heating furnace according to claim 1, characterized in that: The outer end of the fuel injection pipe is equipped with an installation flange.

7. An air heating furnace according to claim 1, characterized in that: The air heating chamber is equipped with a heat exchange coil, which is coiled on the inner shell. The water inlet and outlet of the heat exchange coil both extend to the outside of the outer shell.

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