Waste asphalt reclaimed material drying hot blast stove

Abstract

The utility model provides a waste asphalt reclaimed material drying hot-blast stove which comprises a stove body, a refractory layer is arranged in the stove body, and a heat preservation layer is arranged outside the stove body. The refractory layer comprises a refractory fiber module fixedly mounted on the furnace body and a coating layer coated on the refractory fiber module; the combustor is installed at one end of the furnace body, and a fire blocking cover is installed at the output end of the furnace body; the fire blocking cover is in a funnel shape and located in the furnace body, and the fire blocking cover and the furnace body are coaxially installed. And the ash removal plate is mounted on the heat preservation layer and located at the bottom of the furnace body. According to the technical scheme provided by the embodiment of the invention, the refractory fiber module and the coating layer are mounted on the inner wall of the furnace body, so that a refractory layer can be formed to protect the furnace body, and the overall weight of the furnace body is effectively reduced; meanwhile, the output end of the combustor is further provided with a fire blocking cover, insufficient combustion caused by the fact that flames make contact with the furnace body can be avoided, and high-temperature damage to the refractory layer caused by flame radiation heat can be prevented.

Description

Technical Field

[0001] The present application relates to the technical field of direct-fired hot air furnaces, and in particular to a hot air furnace for drying waste asphalt recycling materials. Background Art

[0002] In the asphalt mixing plant industry, direct-fired hot blast furnaces are widely used for applications with a large proportion of recycled asphalt mixture (RAP). Generally speaking, hot blast furnaces use fuel oil or gas as fuel to generate high-temperature hot air not exceeding 650°C to heat and dry the recycled materials. In this process, a lot of asphalt smoke will be generated, which needs to be mixed with the cold air of the hot blast furnace. While adjusting the hot air temperature at the hot blast furnace outlet, the asphalt smoke is also secondary burned to reduce the harm to the environment. During the process, the hot blast furnace furnace needs to withstand drastic temperature changes, and the asphalt smoke and fuel oil will damage the traditional refractory layer structure (refractory bricks, refractory castables). At the same time, in the overall layout of the asphalt mixing plant, the hot blast furnace is at the highest point of the equipment. If the hot blast furnace furnace is made of refractory bricks and refractory castables, the furnace weight is large, which is a big problem for equipment layout and installation; therefore, the above problems need to be solved urgently. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a hot air furnace for drying waste asphalt recycling materials.

[0004] The present application provides a hot air furnace for drying waste asphalt recycling materials, comprising

[0005] A furnace body, wherein a refractory layer is provided inside the furnace body and a heat-insulating layer is provided outside the furnace body;

[0006] The refractory layer includes a refractory fiber module fixedly mounted on the furnace body and a coating layer coated on the refractory fiber module;

[0007] A burner, the burner is installed at one end of the furnace body, and a fire shield is installed at the output end;

[0008] The fire shield is funnel-shaped, located inside the furnace body, and coaxially installed with the furnace body;

[0009] A cleaning plate is installed on the refractory layer and is located at the bottom of the furnace body.

[0010] Furthermore,

[0011] The fire shield is also provided with a cooling air swirl plate;

[0012] The cooling air swirl plates include a plurality of cooling air swirl plates which are evenly arranged along the circumferential direction on the fire shield.

[0013] Furthermore,

[0014] The cooling air swirl plate is installed obliquely along the axis direction of the fire shield;

[0015] Two adjacent cooling air swirl plates are parallel to each other to form an air guide groove for guiding the incoming air and forming a cyclone.

[0016] Furthermore,

[0017] A mounting plate is provided at the end of the furnace body corresponding to the burner;

[0018] The mounting plate is fixedly mounted on the furnace body, and a matching through hole is provided in the middle corresponding to the fire shield, which is used to connect the burner and the fire shield.

[0019] Furthermore,

[0020] An end of the fire shield with a relatively smaller diameter is connected to the mounting plate via a flange;

[0021] The diameter of the end of the fire shield with a relatively larger diameter is relatively smaller than the diameter of the fire-resistant layer;

[0022] The height of the cooling air swirl plate matches the distance between the fire shield and the fireproof layer.

[0023] Furthermore,

[0024] A cooling air duct is formed between the fire shield, the mounting plate and the furnace body;

[0025] The furnace body is provided with a cooling air inlet damper which is in communication with the cooling air duct.

[0026] Furthermore,

[0027] The cleaning plate is a stainless steel plate, which is fitted on the fire-resistant layer to protect the fire-resistant layer.

[0028] The advantages and positive effects of this application are:

[0029] By installing refractory fiber modules and coating layers on the inner wall of the furnace body, this technical solution can not only form a refractory layer to protect the furnace body, but also effectively reduce the overall weight of the furnace body; at the same time, a fire shield is also installed at the output end of the burner, which can not only avoid the flame from contacting the furnace body and causing incomplete combustion, but also prevent the flame radiation heat from causing high-temperature damage to the refractory layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a hot air furnace for drying waste asphalt recycling material provided in an embodiment of the present application;

[0031] Figure 2A schematic diagram of the structure of a top view of a hot air furnace for drying waste asphalt recycling material provided in an embodiment of the present application;

[0032] Figure 3 A schematic structural diagram of a fire shield for a hot air furnace for drying waste asphalt recycling material provided in an embodiment of the present application.

[0033] The text markings in the figure are as follows: 100 - furnace body; 110 - refractory layer; 120 - insulation layer; 200 - burner; 210 - fire shield; 211 - cooling air swirl plate; 300 - ash cleaning plate. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0035] Please refer to Figure 1 -3. The present embodiment provides a hot air furnace for drying recycled waste asphalt, including a furnace body 100. A refractory layer 110 is provided inside the furnace body 100, and an insulating layer 120 is provided outside the furnace body 100; the refractory layer 110 includes a refractory fiber module fixedly mounted on the furnace body 100 and a coating layer coated on the refractory fiber module; a burner 200, the burner 200 is mounted at one end of the furnace body 100, and a fire shield 210 is installed at the output end; the fire shield 210 is funnel-shaped, located inside the furnace body 100, and is coaxially installed with the furnace body 100; a cleaning plate 300, the cleaning plate 300 is mounted on the refractory layer 110, and is located at the bottom of the furnace body 100.

[0036] In this embodiment, the furnace body 100 is columnar, with a refractory layer 110 provided inside and a thermal insulation layer 120 provided outside; the refractory layer 110 includes a refractory fiber module fixedly mounted on the furnace body 100 and fully covering the furnace body; at the same time, a coating layer is also provided on the side of the refractory fiber module away from the furnace body 100.

[0037] In this embodiment, the burner 200 is fixedly installed at one end of the furnace body 100; the interior of the furnace body 100 is provided with a fire shield 210 connected to the burner 200, which can not only prevent the flame from contacting the furnace body 100 and causing incomplete combustion, but also prevent the flame radiation heat from causing high-temperature damage to the refractory layer 110.

[0038] In this embodiment, the dust cleaning plate 300 is installed on the refractory layer 110 at the bottom of the furnace body 100 to collect dust generated during combustion without causing damage to the refractory layer 110 when handling the dust.

[0039] In this embodiment, the diameter of the fireproof cover 210 is 0.92-0.95 times the diameter of the fireproof layer 110 ; the length of the fireproof cover 210 along the axial direction is 1.2-1.5 times the length of the flame output by the burner 200 .

[0040] In a preferred embodiment, the fire shield 210 is further provided with a cooling air swirl plate 211 ; the cooling air swirl plates 211 include a plurality of cooling air swirl plates 211 , which are evenly arranged along the circumferential direction on the fire shield 210 .

[0041] In this embodiment, a cooling air swirl plate 211 is further provided on the outer ring of the fire shield 210 for conveying cooling air to the interior of the furnace body 100; at the same time, the cooling air can also effectively reduce the temperature of the fire shield 210, thereby preventing the fire shield 210 from being damaged due to high temperature.

[0042] In a preferred embodiment, the cooling air swirl plates 211 are installed obliquely along the axial direction of the fire shield 210; two adjacent cooling air swirl plates 211 are parallel to each other to form an air guide groove for guiding the incoming air and forming a cyclone.

[0043] In this embodiment, adjacent cooling air swirl plates 211 are parallel to each other, and can form an air guide groove in conjunction with the fire shield 210, and can form an air guide channel in conjunction with the refractory layer, so that the cooling air forms a whirlwind after entering, which not only increases the residence time of the cooling air in the furnace body, but also makes the cooling air and the hot air of the flame mixed more evenly.

[0044] In a preferred embodiment, a mounting plate is provided at the end of the furnace body 100 corresponding to the burner 200 ; the mounting plate is fixedly mounted on the furnace body 100 , and a matching through hole is provided in the middle corresponding to the fire shield 210 for connecting the burner 200 and the fire shield 210 .

[0045] In this embodiment, a sealing structure is formed by setting a mounting plate at one end of the furnace body 100 close to the burner 200; a matching through hole is set on the mounting plate corresponding to the burner for allowing flames to pass through; the burner 200 and the fire shield 210 are connected via the mounting plate.

[0046] In a preferred embodiment, the end of the fire shield 210 with a relatively smaller diameter is connected to the mounting plate via a flange; the diameter of the end of the fire shield 210 with a relatively larger diameter is relatively smaller than the diameter of the fireproof layer 110; and the height of the cooling air swirl plate 211 matches the distance between the fire shield 210 and the fireproof layer 110.

[0047] In this embodiment, the fire shield 210 is trumpet-shaped, with the end with a relatively smaller diameter connected to the mounting plate via a flange, and the diameter of the end with a relatively larger diameter is relatively smaller than the inner diameter of the fireproof layer 110, and then cooperates with the cooling air swirl plate 211 to form an air guide channel.

[0048] In a preferred embodiment, a cooling air duct is formed between the fire shield 210, the mounting plate and the furnace body 100; and a cooling air inlet damper communicating with the cooling air duct is provided on the furnace body 100.

[0049] In a preferred embodiment, the cleaning plate 300 is a stainless steel plate, which is mounted on the fire-resistant layer 110 to protect the fire-resistant layer 110 .

[0050] In a preferred embodiment, a fire viewing port is further provided at one end of the furnace body 100 away from the burner 200; the fire viewing port is tilted and is used to observe the combustion conditions inside the furnace body 100.

[0051] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A hot air furnace for drying waste asphalt recycling material, characterized in that: include A furnace body (100), wherein a refractory layer (110) is provided inside the furnace body (100) and a heat-insulating layer (120) is provided outside the furnace body (100); The refractory layer (110) comprises a refractory fiber module fixedly mounted on the furnace body (100) and a coating layer coated on the refractory fiber module; A burner (200), the burner (200) being installed at one end of the furnace body (100), and a fire shield (210) being installed at the output end; The fire shield (210) is funnel-shaped, located inside the furnace body (100), and coaxially installed with the furnace body (100); A cleaning plate (300), the cleaning plate (300) is installed on the refractory layer (110) and is located at the bottom of the furnace body (100).

2. The hot air furnace for drying recycled waste asphalt according to claim 1, characterized in that: The fire shield (210) is also provided with a cooling air swirl plate (211); The cooling air swirl plates (211) include a plurality of cooling air swirl plates (211) which are evenly arranged along the circumferential direction on the fire shield (210).

3. The hot air furnace for drying recycled waste asphalt according to claim 2, characterized in that: The cooling air swirl plate (211) is installed obliquely along the axial direction of the fire shield (210); Two adjacent cooling air swirl plates (211) are parallel to each other to form an air guide groove for guiding the incoming air and forming a swirl.

4. The hot air furnace for drying recycled waste asphalt according to claim 2, characterized in that: An end of the furnace body (100) is provided with a mounting plate corresponding to the burner (200); The mounting plate is fixedly mounted on the furnace body (100), and a matching through hole is provided in the middle corresponding to the fire shield (210) for connecting the burner (200) and the fire shield (210).

5. The hot air furnace for drying recycled waste asphalt according to claim 4, characterized in that: An end of the fire shield (210) with a relatively small diameter is connected to the mounting plate via a flange; The diameter of the end of the fire shield (210) with a relatively larger diameter is relatively smaller than the diameter of the fire-resistant layer (110); The height of the cooling air swirl plate (211) matches the distance between the fire shield (210) and the fireproof layer (110).

6. The hot air furnace for drying recycled waste asphalt according to claim 5, characterized in that: A cooling air duct is formed between the fire shield (210), the mounting plate and the furnace body (100); The furnace body (100) is provided with a cooling air inlet damper which is in communication with the cooling air duct.

7. The hot air furnace for drying recycled waste asphalt according to claim 1, characterized in that: The cleaning plate (300) is a stainless steel plate and is mounted on the fire-resistant layer (110) to protect the fire-resistant layer (110).

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