Hot blast stove for drying

Abstract

The utility model provides a hot blast stove for drying, which comprises a stove body and a burner, the stove body comprises an inner barrel and an outer barrel, and a hollow jacket is formed between the inner barrel and the outer barrel; a door and a coal injection duct are arranged on an end plate of the inner barrel and extend to the outside of the outer barrel; the side wall of the outer barrel is provided with an air supply outlet used for being connected with an air supply pipe, and an end plate of the inner barrel is provided with an air inlet. According to the utility model, air is fed into the jacket through the air supply outlet, and the air enters the furnace body from the air inlet on the end plate after being preheated by the jacket so as to support combustion in the combustion process of pulverized coal; on one hand, heat emitted by the furnace wall can be effectively utilized to preheat air, and the energy utilization rate is increased; on the other hand, the temperature of the furnace body can be reduced, and the risk of scalding caused by mistaken contact is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of hot air furnaces, and in particular to a hot air furnace for drying. Background Art

[0002] Hot air furnace is an essential thermal device for the preparation and drying of chemicals, chemical products and medicines in the chemical and pharmaceutical industries. It mainly uses circulating hot air to dehydrate and dry materials, making it convenient for further operations such as granulation and tableting. It is widely used in phosphate fertilizer processing production lines.

[0003] The common high-efficiency circulating hot air furnaces for phosphate fertilizer processing on the market are mostly similar in structure. They generally use coal or electricity as heat sources, and use blowers to send air heated by the heat source to the drying equipment to dehydrate and dry the materials. The current hot air furnaces still have some functional deficiencies in actual use. For example, when the hot air furnace is working, the temperature of the furnace body rises rapidly, and outsiders may easily get burned if they come into contact with it without knowing it. Secondly, a large part of the heat generated by the internal combustion of the hot air furnace will be dissipated through the furnace wall, resulting in energy waste and low energy utilization. Summary of the invention

[0004] The present application provides a hot air furnace for drying, which solves the problems of the existing hot air furnaces such as fast heating speed, easy scalding and low energy utilization.

[0005] The present application provides a hot air furnace for drying, comprising a furnace body and a burner, wherein the furnace body comprises an inner cylinder and an outer cylinder, wherein a hollow jacket is formed between the inner cylinder and the outer cylinder; a door and a coal injection pipe are provided on the end plate of the inner cylinder, wherein the door and the coal injection pipe extend to the outside of the outer cylinder; an air supply port for connecting an air supply pipe is provided on the side wall of the outer cylinder, and an air inlet is provided on the end plate of the inner cylinder.

[0006] In the technical solution provided in the present application, the furnace body of the hot blast furnace is designed to be a double-layer structure of an inner cylinder and an outer cylinder, a hollow jacket is formed between the inner cylinder and the outer cylinder, and an air supply port is opened on the side wall of the outer cylinder, and an air inlet is opened on the end plate of the inner cylinder. Air is supplied into the jacket through the air supply port. After being preheated by the jacket, the air enters the furnace body from the air inlet on the end plate to assist the combustion process of the coal powder. On the one hand, the heat emitted from the furnace wall can be effectively used to preheat the air, thereby improving energy utilization. On the other hand, the temperature of the furnace body can be reduced to avoid the risk of burns caused by accidental contact.

[0007] In some embodiments, the air supply port is located at one end of the outer cylinder away from the end plate. The purpose of this design is to increase the stroke of the air duct in the jacket, so that the air can fully contact and exchange heat with the inner wall of the jacket, thereby improving the heat exchange efficiency.

[0008] In some embodiments, there are multiple air inlets, and the multiple air inlet arrays are arranged on the end plate of the inner cylinder; by setting multiple air inlets on the end plate, the air entering the furnace body can be more uniform, and the coal powder inside the furnace body can be burned more completely.

[0009] In some embodiments, the outlet of the coal injection pipe is expanded. The purpose of this design is to make the coal powder sprayed from the coal injection pipe more dispersed, so that the coal powder can fully contact with the air inside the furnace body, thereby improving the combustion efficiency of the coal powder.

[0010] In some embodiments, a plurality of cyclone guide vanes are evenly arranged on the inner wall of the coal injection pipe along the circumferential direction. The plurality of cyclone guide vanes can change the injection direction of the coal powder in the coal injection pipe, change the direct injection direction into a cyclone injection direction, form a vortex at the outlet of the coal injection pipe, further disperse the sprayed coal powder, and improve the combustion efficiency of the coal powder.

[0011] In some embodiments, the windward surface of the cyclone guide vane is a curved surface. The purpose of this design is to reduce the impact between the coal powder and the cyclone guide vane, extend the service life of the cyclone guide vane, and reduce noise.

[0012] In some embodiments, the inner wall of the jacket is provided with a plurality of heat exchange fins, the purpose of which is to increase the contact area between the air and the inner wall of the jacket, thereby further improving the heat exchange efficiency between the air and the jacket and improving energy utilization; and can further reduce the temperature of the outer wall of the furnace body to avoid burns.

[0013] In certain embodiments, the outer wall of the outer cylinder is provided with a heat insulating sleeve to further prevent heat loss from the furnace wall and avoid the risk of burns caused by accidental contact.

[0014] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in this application are used to illustrate preferred embodiments, so that those skilled in the art can clearly understand various other advantages and benefits, and should not be considered as limitations of this application. In addition, the same reference numerals are used throughout the drawings to represent the same or similar components.

[0016] Figure 1 This is a front cross-sectional view of a hot blast furnace in one embodiment of the present application;

[0017] Figure 2 A side cross-sectional view of a hot blast furnace in one embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the internal structure of a coal injection pipe in one embodiment of the present application;

[0019] Icons: 1. Inner cylinder; 2. Outer cylinder; 3. Jacket; 4. End plate; 5. Door; 6. Coal injection pipe; 7. Air supply port; 8. Air inlet; 9. Expansion port; 10. Cyclone guide vane. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0023] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0025] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] See also Figure 1-Figure 3 The embodiment of the present application provides a hot air furnace for drying, including a furnace body and a burner, wherein an end plate 4 is provided at one end of the furnace body for inputting fuel (in this embodiment, injected coal powder) and combustion-supporting air, and the other end of the furnace body is an open structure for outputting hot air to provide a heat source for downstream drying equipment; the furnace body comprises an inner cylinder 1 and an outer cylinder 2, and a hollow jacket 3 is formed between the inner cylinder 1 and the outer cylinder 2; a door 5 and a coal injection pipe 6 are provided on the end plate 4 of the inner cylinder 1, and the door 5 and the coal injection pipe 6 extend to the outside of the outer cylinder 2; an air supply port 7 for connecting to an air supply pipe is provided on the side wall of the outer cylinder 2 (the air supply port 7 is connected to the air supply pipe through a flange, and a fan is installed on the air supply pipe), and an air inlet 8 is provided on the end plate 4 of the inner cylinder 1.

[0027] In the technical solution provided in the present application, the furnace body of the hot blast furnace is designed as a double-layer structure of an inner cylinder 1 and an outer cylinder 2, a hollow jacket 3 is formed between the inner cylinder 1 and the outer cylinder 2, and an air supply port 7 is opened on the side wall of the outer cylinder 2, and an air inlet 8 is opened on the end plate 4 of the inner cylinder 1, and air is supplied into the jacket 3 through the air supply port 7. After being preheated by the jacket 3, the air enters the furnace body from the air inlet 8 on the end plate 4 to assist the combustion process of the coal powder; on the one hand, the heat emitted from the furnace wall can be effectively used to preheat the air, thereby improving the energy utilization rate; on the other hand, the temperature of the furnace body can be reduced to avoid the risk of burns caused by accidental contact.

[0028] In this embodiment, the inner cylinder 1 includes a cylindrical heat-resistant castable and a steel plate. The steel plate is surrounded by the outer wall of the heat-resistant castable, and a plurality of refractory nails are welded to the inner wall of the steel plate. The refractory nails are cast in the heat-resistant castable. The length of the refractory nails is 100 mm. The inner diameter of the inner cylinder 1 is 1460 mm, the outer diameter is 1700 mm, the outer diameter of the outer cylinder 2 is 1900 mm, and the spacing between the inner cylinder 1 and the outer cylinder 2 is 100 mm; the length of the furnace body is 4200 mm.

[0029] Please continue reading Figure 1In some embodiments, the air supply port 7 is located at one end of the outer cylinder 2 away from the end plate 4. The purpose of this design is to increase the stroke of the air duct in the jacket 3, so that the air can fully contact and exchange heat with the inner wall of the jacket 3, thereby improving the heat exchange efficiency.

[0030] Please continue reading Figure 1 In a specific embodiment, two air supply ports 7 are provided, which are respectively located on opposite sides of the outer cylinder 2, so as to improve the air supply efficiency.

[0031] Please continue reading Figure 2 In some embodiments, the air inlet 8 is provided in plurality, and the plurality of air inlets 8 are arranged in an array on the end plate 4 of the inner cylinder 1; by providing a plurality of air inlets 8 on the end plate 4, the air entering the furnace body can be made more uniform, and the combustion of the pulverized coal inside the furnace body can be made more complete.

[0032] Please continue reading Figure 1 In some embodiments, the outlet of the coal injection pipe 6 is a flared opening 9. The purpose of such a design is to make the coal powder sprayed from the coal injection pipe 6 more dispersed, so that the coal powder can fully contact with the air inside the furnace body, thereby improving the combustion efficiency of the coal powder.

[0033] Please continue reading Figure 3 In some embodiments, a plurality of cyclone guide vanes 10 are evenly arranged along the circumferential direction on the inner wall of the coal injection pipe 6 (a total of 3 vanes are arranged in this embodiment, and the specific number can be adjusted according to actual conditions). The plurality of cyclone guide vanes 10 can change the injection direction of the coal powder in the coal injection pipe 6, change the direct injection direction to the rotary injection direction, form a vortex at the outlet of the coal injection pipe 6, further disperse the injected coal powder, and improve the combustion efficiency of the coal powder.

[0034] Please continue reading Figure 3 In some embodiments, the windward surface of the cyclone guide vane 10 is a curved surface. The purpose of this design is to reduce the impact between the coal powder and the cyclone guide vane 10, extend the service life of the cyclone guide vane 10, and reduce noise.

[0035] In some embodiments, the inner wall of the jacket 3 is provided with a plurality of heat exchange fins (not shown in the figure), the purpose of which is to increase the contact area between the air and the inner wall of the jacket 3, thereby further improving the heat exchange efficiency between the air and the jacket 3 and improving energy utilization; and can further reduce the temperature of the outer wall of the furnace body to avoid burns.

[0036] In some embodiments, the outer wall of the outer cylinder 2 is provided with a heat insulating sleeve (not shown in the figure, and may be made of asbestos board material) to further prevent heat loss from the furnace wall and avoid the risk of burns caused by accidental contact.

[0037] The working process of the hot blast stove of this embodiment is as follows:

[0038] Coal powder is sprayed into the furnace body through the coal injection pipe 6. The coal powder is swirled out under the action of multiple cyclone guide plates 10 inside the coal injection pipe 6, and is fully contacted with the air inside the furnace body for combustion. At the same time, a fan is used to supply air to the air supply port 7. After the air has fully exchanged heat with the furnace wall in the jacket 3, it enters the furnace body through multiple air inlets 8 arranged in an array on the end plate 4, thereby assisting the combustion of the coal powder. The air is preheated in the jacket 3 before entering the furnace body, which can improve the thermal efficiency of the combustion, reduce the heat energy loss, and at the same time reduce the temperature of the outer surface of the furnace wall to avoid burns.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A hot air furnace for drying, comprising a furnace body and a burner, characterized in that: The furnace body comprises an inner cylinder (1) and an outer cylinder (2), wherein a hollow jacket (3) is formed between the inner cylinder (1) and the outer cylinder (2); a door (5) and a coal injection pipe (6) are provided on the end plate (4) of the inner cylinder (1), wherein the door (5) and the coal injection pipe (6) extend to the outside of the outer cylinder (2); an air supply port (7) for connecting to an air supply pipe is provided on the side wall of the outer cylinder (2), and an air inlet (8) is provided on the end plate (4) of the inner cylinder (1).

2. A hot air furnace for drying according to claim 1, characterized in that: The air supply port (7) is located at an end of the outer cylinder (2) away from the end plate (4).

3. A hot air furnace for drying according to claim 1, characterized in that: A plurality of the air inlets (8) are provided, and the plurality of the air inlets (8) are arranged in an array on the end plate (4) of the inner cylinder (1).

4. A hot air furnace for drying according to claim 1, characterized in that: The outlet of the coal injection pipe (6) is a flared opening (9).

5. A hot air furnace for drying according to claim 1, characterized in that: The inner wall of the coal injection pipe (6) is evenly provided with a plurality of cyclone guide vanes (10) along the circumferential direction.

6. A hot air furnace for drying according to claim 5, characterized in that: The windward surface of the cyclone guide plate (10) is a curved surface.

7. A hot air furnace for drying according to claim 1, characterized in that: The inner wall of the jacket (3) is provided with a plurality of heat exchange fins.

8. A hot air furnace for drying according to claim 1, characterized in that: The outer wall of the outer cylinder (2) is provided with a heat insulation sleeve.

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