A hot blast stove for heating in a coal mine

Abstract

The utility model discloses a kind of hot blast furnace for coal mine underground heating, including furnace body and control mechanism, the furnace body inside is provided with combustion chamber, the top center of combustion chamber is connected with flue, the inside of combustion chamber is provided with static mixer, the inlet end of static mixer is connected with air inlet pipe, the outlet end of static mixer is connected with air outlet pipe, the side wall of furnace body is located at the bottom of static mixer and is provided with feed inlet, the feed inlet is equipped with feeding assembly, the bottom of combustion chamber is fixed with material-receiving grid, the bottom center of furnace body is provided with discharge port, the discharge port is equipped with dust cleaning assembly, the side wall of furnace body is located at the bottom of material-receiving grid and is connected with air induction pipe, the inclined spiral turbulent structure of static mixer, by forced convection and turbulent mixing, reduce the temperature stratification phenomenon of cold air in lumen, make outlet hot air temperature uniform, solve the problem of local overheating or underheating of traditional equipment.

Description

Technical Field

[0001] This utility model belongs to the field of hot air furnace technology, specifically relating to a hot air furnace for underground heating in coal mines. Background Technology

[0002] The underground environment in coal mines is complex, and traditional heating blast furnaces generally suffer from significant fluctuations in hot air temperature and require frequent manual operation. In existing technologies, most blast furnaces use straight-tube heat exchangers, which easily lead to temperature stratification as cold air flows through the pipes, resulting in localized overheating or underheating of the outlet hot air. This temperature unevenness not only reduces the comfort of underground operations but can also cause safety hazards due to high-temperature zones. Furthermore, traditional equipment relies on manual, timed feeding and ash removal, which can cause furnace temperature fluctuations during feeding intervals, further exacerbating the instability of the supply air temperature. Frequent manual ash removal not only increases the labor intensity of workers but also introduces safety risks such as high-temperature contact and dust exposure during equipment operation.

[0003] To address the aforementioned issues, while some equipment has attempted to introduce automated components, these efforts have largely focused on improving single functions, failing to address the contradiction between hot air uniformity and continuous stable operation. If only automatic feeding is implemented while ash removal efficiency is neglected, ash accumulation will still hinder heat conduction in the combustion chamber, affecting heat exchange stability. Furthermore, if only heat exchange is enhanced without optimizing the temperature field distribution, the uniformity of the outlet hot air will still be insufficient to meet mine requirements. To address these problems, this utility model proposes a hot air furnace for underground coal mine heating that simultaneously ensures hot air output quality and operational continuity, reducing manual intervention while achieving high uniformity of the hot air temperature field and long-term equipment stability. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hot air furnace for underground heating in coal mines, comprising a furnace body and a control mechanism. A combustion chamber is provided inside the furnace body, and a flue is connected to the center of the top of the combustion chamber. A static mixer is provided inside the combustion chamber, with an air inlet pipe connected to the inlet end of the static mixer and an air outlet pipe connected to the outlet end. A feed inlet is provided on the side wall of the furnace body at the bottom of the static mixer, and a feeding assembly is installed at the feed inlet. A material-supporting grid is fixed at the bottom of the combustion chamber. A discharge port is provided at the center of the bottom of the furnace body, and a ash-removing assembly is installed at the discharge port. An induced draft pipe is connected to the side wall of the furnace body at the bottom of the material-supporting grid.

[0005] As a preferred embodiment of this utility model, the angle between the axis of the static mixer and the horizontal plane is 30°-60°, and spiral baffles are distributed at intervals along the axis inside the cavity.

[0006] As a preferred embodiment of this utility model, both the air inlet pipe and the air outlet pipe are connected to an exhaust fan.

[0007] As a preferred embodiment of this utility model, the feeding assembly includes a vertical screw conveyor, the feeding end of which is welded with a storage hopper, and the discharging end of which is connected to the combustion chamber.

[0008] As a preferred embodiment of this utility model, the ash removal assembly includes a shaftless screw conveyor, the feed end of which is connected to the discharge port of the furnace body, and a detachable collection box is installed at the discharge end of the shaftless screw conveyor.

[0009] As a preferred embodiment of this utility model, the control mechanism includes a temperature sensor and a controller. The temperature sensor is installed at the outlet of the air duct, and the controller is electrically connected to the temperature sensor and the driver of the drive motor of the vertical screw conveyor and the shaftless screw conveyor, respectively.

[0010] As a preferred technical solution of this utility model, the furnace body has an operation port on one side of the material receiving grid, and a sealing door plate is installed at the operation port.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) The inclined spiral turbulence structure of the static mixer of this utility model reduces the temperature stratification of cold air in the pipe cavity by forced convection and turbulent mixing, so that the outlet hot air temperature is uniform, which solves the problem of local overheating or underheating of traditional equipment and meets the stringent requirements of mine for the uniformity of heating temperature field.

[0013] (2) The feeding component and the ash removal component are linked by the control mechanism to realize the full automation of the "feeding-combustion-ash removal" process, avoid furnace temperature fluctuations during the manual feeding interval, improve temperature stability, and eliminate the risk of high temperature contact and dust exposure caused by manual ash removal.

[0014] (3) The air intake design of the duct creates a vertically connected airflow field. The combustion air below the feed grid not only ensures complete combustion of the fuel, but also improves the combustion efficiency of the combustion chamber through a dual mechanism of thermal radiation and convection. The shaftless screw conveyor is designed for the characteristics of coal ash, avoiding the problem of small conveying capacity in traditional shafted structures. With the detachable collection box, the single ash cleaning time is shortened to less than 5 minutes, and the continuous operation cycle of the equipment is extended to more than 72 hours, reducing the frequency of downtime maintenance. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the furnace body in this utility model;

[0018] In the diagram: 1. Furnace body; 2. Combustion chamber; 3. Flue; 4. Static mixer; 5. Air inlet pipe; 6. Air outlet pipe; 7. Feed inlet; 8. Material receiving grid; 9. Discharge outlet; 10. Exhaust pipe; 11. Exhaust fan; 12. Vertical screw conveyor; 13. Storage hopper; 14. Shaftless screw conveyor; 15. Collection box; 16. Operating port; 17. Sealing door 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example

[0021] Please see Figure 1-2 The present invention provides the following technical solution: a hot air furnace for underground heating in coal mines, comprising a furnace body 1 and a control mechanism. A combustion chamber 2 is provided inside the furnace body 1. A flue 3 is connected to the center of the top of the combustion chamber 2. A static mixer 4 is provided inside the combustion chamber 2. An air inlet pipe 5 is connected to the inlet end of the static mixer 4. An air outlet pipe 6 is connected to the outlet end of the static mixer 4. A feed inlet 7 is provided on the side wall of the furnace body 1 at the bottom of the static mixer 4. A feeding component is installed at the feed inlet 7. A material receiving grid 8 is fixed at the bottom of the combustion chamber 2. A discharge port 9 is provided at the center of the bottom of the furnace body 1. A ash removal component is installed at the discharge port 9. An induced draft pipe 10 is connected to the bottom of the material receiving grid 8 on the side wall of the furnace body 1.

[0022] In order to optimize the uniformity of hot air temperature and avoid the formation of temperature stratification of cold air in the cavity, in this embodiment, as a preferred technical solution of the present invention, the angle between the axis of the static mixer 4 and the horizontal plane is 30°-60°, and spiral baffles are distributed at intervals along the axis in its cavity.

[0023] In order to ensure the directional flow of combustion air and heat exchange air in combustion chamber 2 and improve fuel combustion efficiency and heat exchange efficiency, in this embodiment, as a preferred technical solution of the present invention, an induced draft fan 11 is connected to the port of both the air inlet pipe 5 and the induced draft pipe 10.

[0024] In order to achieve automated and continuous fuel supply and avoid furnace temperature fluctuations caused by manual feeding, in this embodiment, as a preferred technical solution of the present invention, the feeding component includes a vertical screw conveyor 12, with a storage hopper 13 welded to the feeding end of the vertical screw conveyor 12, and the discharge end of the vertical screw conveyor 12 connected to the combustion chamber 2.

[0025] In order to achieve efficient automatic discharge and collection of ash and slag and avoid the accumulation of ash and slag affecting the heat transfer efficiency, in this embodiment, as a preferred technical solution of the present invention, the ash removal component includes a shaftless screw conveyor 14, the feed end of the shaftless screw conveyor 14 is connected to the discharge port 9 of the furnace body 1, and a detachable collection box 15 is installed at the discharge end of the shaftless screw conveyor 14.

[0026] In order to automatically adjust the feeding and dust removal frequency based on real-time hot air temperature data, and to ensure the stability of the air supply temperature and the intelligent operation of the equipment, in this embodiment, as a preferred technical solution of the present invention, the control mechanism includes a temperature sensor and a controller. The temperature sensor is installed at the outlet of the air duct 6, and the controller is electrically connected to the temperature sensor and the driver of the drive motor of the vertical screw conveyor 12 and the shaftless screw conveyor 14, respectively.

[0027] In order to balance the convenience of equipment maintenance with the sealing performance of the combustion chamber 2, and to facilitate daily maintenance and heat retention, in this embodiment, as a preferred technical solution of the present invention, the furnace body 1 has an operation port 16 on one side of the material receiving grid 8, and a sealing door plate 17 is installed at the operation port 16.

[0028] In summary, the workflow and specific principles of this utility model, based on the above-described technical solution, are as follows:

[0029] Fuel supply and combustion system: The fuel in the storage hopper 13 is transported by the spiral blades of the vertical screw conveyor 12 and evenly fed into the combustion chamber 2 through the feed port 7. It falls onto the receiving grid 8 to form a fuel layer. Then, the fuel layer is ignited from the operation port 16 by the igniter and the sealing door 17 is closed. The exhaust pipe 10 introduces combustion air to the bottom of the combustion chamber 2 through the exhaust fan 11, which fully contacts the fuel layer to help it burn completely. The high-temperature flue gas generated by combustion is discharged through the flue 3, and at the same time, the heat is transferred to the surrounding space of the combustion chamber 2.

[0030] Heat exchange and hot air homogenization: Cold air is drawn into the air inlet pipe 5 by the induced draft fan 11 and undergoes enhanced heat exchange through the static mixer 4. The static mixer 4 is arranged at an inclination of 30°-60°. The spiral baffles inside the pipe body force the airflow to rotate and be divided, breaking the temperature stratification phenomenon of traditional straight pipe heat exchangers. When the cold air flows through the static mixer 4, the pipe wall and the cold air exchange heat. The heated air is rotated and separated again by the internal spiral baffles and mixed with the internal air to form hot air with a uniform temperature. It is then transported to the underground heating area through the air outlet pipe 6.

[0031] Ash and slag handling and automation control: After combustion, the ash and slag fall through the receiving grid 8 to the bottom of the furnace body 1, and enter the shaftless screw conveyor 14 through the discharge port 9. The shaftless screw blades then push the ash and slag to the detachable collection box 15 for collection. The temperature sensor of the control mechanism monitors the hot air temperature of the exhaust duct 6 in real time. Based on the signal feedback from the temperature sensor, the controller automatically adjusts the feeding speed of the vertical screw conveyor 12 and the ash cleaning frequency of the shaftless screw conveyor 14 according to preset thresholds to ensure a balance between the fuel quantity and the ash and slag quantity in the furnace.

[0032] Finally, it should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot air furnace for underground heating in coal mines, comprising a furnace body (1) and a control mechanism, wherein a combustion chamber (2) is provided inside the furnace body (1), and a flue (3) is connected to the center of the top of the combustion chamber (2), characterized in that: The combustion chamber (2) is equipped with a static mixer (4). The inlet end of the static mixer (4) is connected to an air inlet pipe (5), and the outlet end of the static mixer (4) is connected to an air outlet pipe (6). The side wall of the furnace body (1) is provided with a feed inlet (7) at the bottom of the static mixer (4). A feeding assembly is installed at the feed inlet (7). A material-bearing grid (8) is fixed at the bottom of the combustion chamber (2). A discharge port (9) is provided at the center of the bottom end of the furnace body (1). A ash-removing assembly is installed at the discharge port (9). An exhaust pipe (10) is connected to the bottom of the material-bearing grid (8) on the side wall of the furnace body (1).

2. A hot air furnace for underground heating in coal mines according to claim 1, characterized in that: The angle between the axis of the static mixer (4) and the horizontal plane is 30°-60°, and spiral baffles are distributed at intervals along the axis inside its cavity.

3. A hot air furnace for underground heating in coal mines according to claim 1, characterized in that: Both the air inlet pipe (5) and the air outlet pipe (10) are connected to an exhaust fan (11).

4. A hot air furnace for underground heating in coal mines according to claim 1, characterized in that: The feeding assembly includes a vertical screw conveyor (12), the feed end of which is welded with a storage hopper (13), and the discharge end of which is connected to the combustion chamber (2).

5. A hot air furnace for underground heating in coal mines according to claim 4, characterized in that: The dust removal assembly includes a shaftless screw conveyor (14), the feed end of which is connected to the discharge port (9) of the furnace body (1), and the discharge end of which is equipped with a detachable collection box (15).

6. A hot air furnace for underground heating in coal mines according to claim 5, characterized in that: The control mechanism includes a temperature sensor and a controller. The temperature sensor is installed at the outlet of the air duct (6). The controller is electrically connected to the temperature sensor and the drivers of the drive motors of the vertical screw conveyor (12) and the shaftless screw conveyor (14).

7. A hot air furnace for underground heating in coal mines according to claim 1, characterized in that: The furnace body (1) has an operation port (16) on one side of the material receiving grid (8), and a sealing door plate (17) is installed at the operation port (16).

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