Indirect heat exchange hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, and discloses an indirect heat exchange hot blast stove which comprises a stove body, a combustion hearth is fixed on the stove body, a connecting pipe is fixed in the stove body, and the connecting pipe is fixedly communicated with the combustion hearth. An air inlet is formed in the furnace body, a fixing frame is fixedly arranged in the air inlet, and a rotating shaft is rotationally mounted on the fixing frame; the rotating shaft penetrates into the connecting pipe and is rotationally connected with the connecting pipe; a first fan blade is arranged at an air inlet of the furnace body, and a second fan blade is arranged in the connecting pipe; the first fan blade and the second fan blade are coaxially and fixedly mounted on the rotating shaft; the first fan blades are used for pushing cold air outside the furnace body into the furnace body; the second fan blades are in transmission fit with high-temperature waste gas blown out of the combustion hearth and used for driving the second fan blades to rotate. High-temperature waste gas drives the second fan blade to rotate, then the rotating shaft drives the first fan blade to rotate, air exhaust is achieved, no motor or other electric appliance driving sources are involved in the whole process, the structure is simple, the failure rate is low, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, in particular to an indirect heat exchange hot blast stove. Background Art

[0002] A hot blast furnace is an industrial furnace that is mainly used to heat air to a certain temperature and then used in industrial production processes, such as steel smelting, chemicals, building materials, ceramics and other industries. It generates high-temperature gas by burning fuel, and then transfers the heat of these high-temperature gases to the air through a heat exchanger to obtain hot air. The working principle of a hot blast furnace is usually based on the "heat storage" principle, that is, burning fuels such as coal gas in the combustion chamber, and the high-temperature exhaust gas generated passes through the checker bricks and stores heat. When the checker bricks are fully heated, the hot blast furnace can deliver hot air into the required process through the air supply valve.

[0003] The disclosure of the invention discloses a high-efficiency indirect hot blast furnace, comprising a furnace body, a combustion furnace inside the furnace body, a cold air inlet and a fan at the bottom of the furnace body, a hot air outlet and an air filter at the upper end, a heat exchange pipe connected to the combustion furnace in a spiral shape and arranged inside the furnace body, a dust removal chamber and a dust removal device are arranged between the heat exchange pipe and the combustion furnace, and an exhaust gas recovery pipe is connected to the upper end of the heat exchange pipe.

[0004] Based on the above technical features, the problem that arises is: in the prior art, the air outside the furnace body needs to be drawn into the furnace body through a fan. Since the furnace body contains high-temperature gas and the fan is driven by a motor, the motor is in a high-temperature working environment, and the fan power is affected, which can easily lead to fan failure and reduce the life of the fan.

[0005] Therefore, it is necessary to solve the above problems by an indirect heat exchange hot air stove. Summary of the invention

[0006] The purpose of the utility model is to provide an indirect heat exchange hot air stove to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an indirect heat exchange hot air furnace, comprising a furnace body, a combustion furnace chamber is fixedly arranged on the furnace body, a connecting pipe is fixedly arranged in the furnace body, and the connecting pipe is fixedly connected to the combustion furnace chamber; an air inlet is provided on the furnace body, a fixing frame is fixedly arranged in the air inlet, and a rotating shaft is rotatably installed on the fixing frame; the rotating shaft penetrates into the connecting pipe and is sealed and rotatably connected with the connecting pipe; a first fan blade is arranged at the air inlet of the furnace body, and a second fan blade is arranged in the connecting pipe; the first fan blade and the second fan blade are both coaxially fixedly installed on the rotating shaft; the first fan blade is used to push the cold air outside the furnace body into the interior of the furnace body; the second fan blade is matched with the high-temperature exhaust gas blown out from the combustion furnace chamber to drive the second fan blade to rotate.

[0008] Preferably, the first blade and the second blade are both made of high temperature resistant aluminum alloy or PBT engineering plastic.

[0009] Preferably, a mounting seat is fixedly provided on the furnace body, a burner is fixedly mounted on the mounting seat, and an output port of the burner is fixedly connected to the combustion furnace.

[0010] Preferably, a heat exchange tube is fixedly arranged in the furnace body, and the heat exchange tube is a spiral pipe; the heat exchange tube is fixedly connected with the connecting tube.

[0011] Preferably, a waste gas recovery pipe is fixedly arranged on the furnace body, and the waste gas recovery pipe is fixedly connected to the heat exchange pipe.

[0012] Preferably, the furnace body is fixedly connected to a hot air output pipe, and a filter is fixedly installed in the hot air output pipe.

[0013] Preferably, a filter is fixedly arranged at the connection point between the combustion furnace and the connecting pipe; a collecting box is fixedly arranged in the furnace body, the collecting box is fixedly connected with the combustion furnace and corresponds to the filter; the filter is inclined and slanted to the collecting box.

[0014] The technical effects and advantages of the utility model are as follows: the utility model drives the second fan blade to rotate through high-temperature exhaust gas, and the second fan blade drives the first fan blade to rotate through the rotating shaft, thereby realizing the drawing of cold air outside the furnace body into the furnace body. The whole process does not involve any electrical driving source such as a motor, and the structure is simple and the failure rate is low. While increasing the service life, the production efficiency is improved, and the use and manufacturing costs are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a partial cross-sectional schematic diagram of the utility model;

[0017] Figure 3It is a semi-section schematic diagram of the utility model;

[0018] Figure 4 It is an enlarged schematic diagram of point A of the present utility model.

[0019] In the figure: 1. furnace body; 2. filter; 3. hot air output pipe; 4. exhaust gas recovery pipe; 5. mounting base; 6. burner; 7. combustion furnace; 8. through hole; 9. heat exchange tube; 10. rotating shaft; 11. fixed shaft; 12. first fan blade; 13. fixing frame; 14. collecting box; 15. filter; 16. second fan blade; 17. connecting pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] The utility model provides an indirect heat exchange hot air furnace, comprising a furnace body 1. Figure 1 As shown, the furnace body 1 is cylindrical. Support legs are welded to the bottom of the furnace body 1. The top of the furnace body 1 is fixedly connected to a hot air output pipe 3 and an exhaust gas recovery pipe 4. The hot air output pipe 3 is connected to the inside of the furnace body 1, and a filter 2 is fixedly installed in the hot air output pipe 3 for filtering the heated air.

[0022] A mounting seat 5 is welded on the side wall of the furnace body 1, and a burner 6 is fixedly mounted on the mounting seat 5. A combustion furnace 7 is welded on the furnace body 1, and the combustion furnace 7 is fixedly connected with the output port of the burner 6 and penetrates into the furnace body 1 along the radial direction of the furnace body 1 to generate high-temperature gas.

[0023] like Figure 2 As shown, a fixed shaft 11 is welded and fixed in the furnace body 1 along the axial direction, and a spiral ascending heat exchange tube 9 is fixedly assembled on the fixed shaft 11. The top pipe opening of the heat exchange tube 9 is fixedly connected to the exhaust gas recovery pipe 4 for collecting the cooled exhaust gas.

[0024] A connecting pipe 17 is welded on the furnace body 1. The connecting pipe 17 is located inside the furnace body 1 and a through hole 8 is cut on the pipe body. The connecting pipe 17 is fixedly connected to the bottom pipe opening of the heat exchange pipe 9 through the through hole 8. Figure 3As shown, the connecting pipe 17 is fixedly connected with the combustion furnace 7 along the radial direction of the furnace body 1, and a filter screen 15 is fixedly assembled at the connection point, and the filter screen 15 is used to filter impurities in the high-temperature gas. A collection box 14 is placed in the furnace body 1, and the collection box 14 is fixedly connected with the combustion furnace 7. The collection box 14 corresponds to the filter screen 15, and the filter screen 15 is located above the collection box 14 and arranged obliquely. The top of the filter screen 15 is inclined toward the collection box 14 to ensure that the filtered impurities can automatically fall into the collection box 14.

[0025] An air inlet is cut out at the bottom of the furnace body 1, and a fixing frame 13 is fixedly assembled in the air inlet, and the fixing frame 13 is fixedly connected to the furnace body 1. A vertical rotating shaft 10 is rotatably connected to the fixing frame 13, such as Figure 3 and Figure 4 As shown, the top of the rotating shaft 10 penetrates into the connecting pipe 17 and is connected to the connecting pipe 17 in a sealed and rotating manner.

[0026] The first blade 12 is arranged at the air inlet of the furnace body 1, and the second blade 16 is installed in the connecting pipe 17. The first blade 12 and the second blade 16 are coaxially fixedly connected to the rotating shaft 10. The first blade 12 is used for exhausting air, and the second blade 16 is driven and matched with the high-temperature gas blown out from the combustion furnace 7.

[0027] Working principle: When in use, the burner 6 is started, and the burner 6 produces hot gas by burning the furnace 7, and the hot gas enters the connecting pipe 17 after being filtered by the filter 15. Since the filter 15 is inclined, the impurities on the filter 15 will fall into the collection box 14.

[0028] Then, as the burner 6 continues to work, the hot air entering the connecting pipe 17 blows the second blade 16 to rotate, the second blade 16 drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the first blade 12 to rotate, and the first blade 12 pushes the cold air outside the furnace body 1 into the furnace body 1. At the same time, the hot air enters the heat exchange tube 9 through the through hole 8 on the connecting pipe 17. The hot air entering the heat exchange tube 9 heats the cold air entering the furnace body 1 through the heat exchange tube 9, thereby forming hot air.

[0029] As the first fan blade 12 continues to rotate, the hot air is filtered by the filter 2 on the hot air output pipe 3 and then discharged from the hot air output pipe 3. At the same time, the gas in the heat exchange pipe 9 enters the exhaust gas recovery pipe 4 for collection.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An indirect heat exchange hot air furnace, comprising a furnace body (1), a combustion furnace (7) fixedly arranged on the furnace body (1), characterized in that: A connecting pipe (17) is fixedly arranged in the furnace body (1), and the connecting pipe (17) is fixedly connected to the combustion furnace (7); an air inlet is provided on the furnace body (1), and a fixing frame (13) is fixedly arranged in the air inlet, and a rotating shaft (10) is rotatably mounted on the fixing frame (13); the rotating shaft (10) penetrates into the connecting pipe (17) and is sealed and rotatably connected to the connecting pipe (17); a first fan blade (12) is arranged at the air inlet of the furnace body (1), and a second fan blade (16) is arranged in the connecting pipe (17); the first fan blade (12) and the second fan blade (16) are both coaxially fixedly mounted on the rotating shaft (10); the first fan blade (12) is used to push cold air outside the furnace body (1) into the interior of the furnace body (1); the second fan blade (16) is transmission-coordinated with high-temperature exhaust gas blown out from the combustion furnace (7) to drive the second fan blade (16) to rotate.

2. The indirect heat exchange hot air stove according to claim 1, characterized in that: The first fan blade (12) and the second fan blade (16) are both made of high-temperature resistant aluminum alloy or PBT engineering plastic.

3. The indirect heat exchange hot air stove according to claim 1, characterized in that: A mounting seat (5) is fixedly arranged on the furnace body (1), a burner (6) is fixedly mounted on the mounting seat (5), and an output port of the burner (6) is fixedly connected to the combustion furnace (7).

4. The indirect heat exchange hot air stove according to claim 1, characterized in that: A heat exchange tube (9) is fixedly arranged in the furnace body (1); the heat exchange tube (9) is a spiral tube; and the heat exchange tube (9) is fixedly connected to a connecting tube (17).

5. The indirect heat exchange hot air stove according to claim 4, characterized in that: An exhaust gas recovery pipe (4) is fixedly arranged on the furnace body (1), and the exhaust gas recovery pipe (4) is fixedly connected to the heat exchange pipe (9).

6. The indirect heat exchange hot air stove according to claim 1, characterized in that: The furnace body (1) is fixedly connected to a hot air output pipe (3), and a filter (2) is fixedly installed in the hot air output pipe (3).

7. The indirect heat exchange hot air stove according to claim 1, characterized in that: A filter screen (15) is fixedly arranged at the connection point between the combustion furnace (7) and the connecting pipe (17); a collection box (14) is fixedly arranged in the furnace body (1), the collection box (14) is fixedly connected to the combustion furnace (7) and corresponds to the filter screen (15); the filter screen (15) is arranged obliquely and is inclined toward the collection box (14).

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