Air inlet pipeline preheating device

Abstract

The utility model relates to the technical field of kiln gas pipeline preheating, in particular to a gas inlet pipeline preheating device which comprises a box body and at least one heater assembly. A through hole for the ventilation pipeline to penetrate through is formed in one side face of the box body, and the heater assembly is arranged in the box body and installed on the other side faces of the box body; the heater assembly comprises a heating plate and a heating wire; the heating wire is spiral and is embedded into the heating plate; at least one supporting shaft is arranged in the box body; and the at least one supporting shaft is arranged at the position far away from the through hole, is arranged below the ventilation pipeline and is used for supporting the ventilation pipeline. The preheating device is simple in structure, low in manufacturing cost, not prone to damage, high in heating efficiency and adjustable in heating temperature. The problems that an existing preheating mode in the prior art is low in heating efficiency, large in heating temperature fluctuation, poor in temperature control precision and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of preheating of gas pipelines in kilns, and particularly relates to a preheating device for an intake pipeline. Background Art

[0002] A kiln is a device made of refractory materials for calcining materials or firing products, and is the core device in the production process, and is widely used in many production industries such as metallurgy, chemical industry, building materials, glass, and electronics.

[0003] A kiln generally mainly consists of four parts: a furnace chamber, a combustion device, a ventilation device, and a conveying device; among them, the furnace chamber is the core part of the kiln, which is used to accommodate the material to be processed and heat it, the conveying device is used to send the material to be processed into the furnace chamber and remove the processed material from the furnace chamber, the combustion device is responsible for providing heat source to the furnace chamber, and the ventilation device is used to regulate the atmosphere and air flow in the furnace chamber; and for a kiln that needs to control the atmosphere, the ventilation device is particularly important, it can not only provide atmosphere to the inside of the furnace chamber and discharge waste gas, but also control the temperature and humidity inside the furnace chamber, improve the uniformity of the temperature inside the furnace chamber, control the chemical composition of the product, and thus improve the product quality and production efficiency. However, due to the high temperature inside the furnace chamber, and the temperature of the process gas supplied to the inside of the furnace chamber is much lower than the temperature inside the furnace chamber. If these process gases are directly introduced into the furnace chamber without heating, it will disrupt the distribution of the temperature field inside the furnace chamber, significantly reduce the temperature at the intake point inside the furnace chamber, and the temperature uniformity of the furnace chamber will be greatly affected; this effect is particularly obvious in the furnace chamber of a small kiln; at the same time, after many products come into contact with the cold process gas, surface peeling and cracking will occur, seriously affecting the quality of the products. Therefore, it is necessary to install a preheating device on the intake pipeline of the kiln to preheat the industrial gas in the pipeline and then transport it to the inside of the furnace chamber to reduce the influence of the introduced industrial gas on the temperature field inside the furnace chamber.

[0004] Currently, there are the following several ways to preheat industrial gas in the existing intake pipeline:

[0005] 1) Convert the heat of the waste gas discharged from the kiln furnace chamber through a heat exchanger and heat the gas to be preheated; although this method saves energy, the colloid in the waste gas will coat, block and even damage the heat exchanger, and it is very difficult to clean the heat exchanger;

[0006] 2) Install the intake pipeline in the furnace wall bricks of the kiln; although there is no pollution of the pipeline by the waste gas in the furnace, this structure makes the construction of the kiln lining very complicated and greatly increases the cost of building the furnace;

[0007] 3) Heat the intake pipe using electric heating tubes or heating tapes; however, with this heating method, the heating area is very small, resulting in very low heating efficiency, and the heating temperature is prone to fluctuations, and the temperature control accuracy is poor.

[0008] The present utility model provides a preheating device for an intake pipe to solve the problems existing in the prior art, such as low heating efficiency, large fluctuations in heating temperature, and poor temperature control accuracy in the existing preheating methods. Summary of the Utility Model

[0009] The object of the present utility model is to provide a preheating device for an intake pipe to solve the problems existing in the prior art, such as low heating efficiency, large fluctuations in heating temperature, and poor temperature control accuracy in the existing preheating methods.

[0010] The technical solution of the present utility model is: a preheating device for an intake pipe, comprising a box body and at least one heater assembly; a through hole for the ventilation pipe to pass through is provided on one side of the box body, the heater assembly is arranged inside the box body and is installed on the remaining sides of the box body; the heater assembly includes a heating plate and a heating wire; the heating wire is spiral and is embedded in the heating plate; at least one support shaft is arranged inside the box body; at least one support shaft is arranged at a position far from the through hole and is arranged below the ventilation pipe for supporting the ventilation pipe.

[0011] Preferably, the ventilation pipe is configured as a U shape, including an intake end, an outlet end, and a transition end; the intake end and the outlet end are arranged in parallel, and the support shaft passes through the space between the intake end and the outlet end and supports below the pipe above the intake end and the outlet end.

[0012] Preferably, a wire inlet hole is provided on the heating plate; a receiving cavity is arranged inside the heating plate; the wire inlet hole is communicated with the receiving cavity for passing the heating wire through the wire inlet hole into the receiving cavity.

[0013] Preferably, the receiving cavities are arranged in several rows parallel to each other, and the heads and tails of the several rows of receiving cavities are connected in communication; the several rows of receiving cavities are arranged along the length direction or the width direction parallel to the heating plate.

[0014] Preferably, there are two heater assemblies; the two heater assemblies are symmetrically arranged inside the box body and are arranged on the side adjacent to the side where the through hole is provided.

[0015] Preferably, it further includes a thermocouple; the thermocouple is arranged on the outer side of the box body and extends into the box body for monitoring the temperature inside the preheating device.

[0016] Compared with the prior art, the advantages of the present utility model are:

[0017] (1) The present utility model provides a preheating device for an intake pipeline. The structure of this preheating device is simple, with low manufacturing cost, not easily damaged, and high heating efficiency. Moreover, the preheating temperature of this preheating device can be regulated, and the temperature control accuracy is high. At the same time, this preheating device can not only heat multiple intake pipelines simultaneously, but also set different heating temperatures for the intake pipelines at different positions according to the requirements of the product process. Thus, this preheating device can flexibly meet different heating temperature requirements and expand its application scope, solving the problems existing in the prior art, such as low heating efficiency, large fluctuations in heating temperature, and poor temperature control accuracy of the existing preheating methods.

[0018] (2) The present utility model provides a preheating device for an intake pipeline. The heating plate of this preheating device is made of lightweight refractory material, endowing the heating plate with excellent high-temperature resistance performance, greatly reducing the loss of the heating plate, and effectively improving the service life of this preheating device. The ventilation pipeline of this preheating device is made of stainless steel material, enabling the ventilation pipeline to not only withstand a sufficiently high temperature but also prevent the ventilation pipeline from oxidizing and rusting at high temperatures, resulting in gas contamination and further affecting the purity and quality of the product. At the same time, the thermocouple installed on this preheating device can control the temperature inside the box body to ensure the stability of the temperature inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0020] Figure 1 is a schematic structural diagram of the preheating device provided by the present utility model;

[0021] Figure 2 is a right view of the preheating device provided by the present utility model;

[0022] Figure 3 is a schematic structural diagram of the heater assembly provided by the present utility model;

[0023] Figure 4 is a right view of the heater assembly provided by the present utility model;

[0024] Figure 5 is a top view of the preheating device provided by the present utility model;

[0025] Among them, 1. Heater assembly; 2. Box body; 3. Heating plate; 4. Heating wire; 31. Inlet hole; 32. Accommodation cavity; 5. Support shaft; 6. Thermocouple; 7. Ventilation pipeline; 72. Intake end; 71. Outlet end; 73. Transition end; 8. Through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further elaborates on the content of the present utility model in conjunction with specific embodiments:

[0027] An intake pipe preheating device includes a box body 2 and at least one heater assembly 1; a through hole 8 for the ventilation pipe 7 to pass through is provided on one side of the box body 2, the heater assembly 1 is arranged inside the box body 2 and is mounted on the remaining sides of the box body 2. The heater assembly 1 includes a heating plate 3 and a heating wire 4; the heating wire 4 is in a spiral shape and is embedded in the heating plate 3. At least one support shaft 5 is also provided inside the box body 2; at least one support shaft 5 is arranged at a position far from the through hole 8 and below the ventilation pipe 7 for supporting the ventilation pipe 7. Among them, the heating plate 3 is made of a light refractory material, such as aluminosilicate fiber board; at the same time, since the temperature inside the box body 2 is relatively high, the support shaft 5 needs to be made of materials with high temperature resistance characteristics such as ceramic materials, silicon glass materials, alloy materials, such as porcelain tubes, stainless steel tubes, etc.

[0028] The ventilation pipe 7 is arranged as a U-shaped pipe, such as Figure 1 shown, and includes an intake end 72, an outlet end 71 and a transition end 73; the intake end 72 and the outlet end 71 are arranged in parallel. The intake end 72 and the outlet end 71 respectively pass through the through hole 8 and are respectively connected to the intake pipe of the kiln and the intake port of the kiln through connectors, so that the gas transported to the kiln through the intake pipe first enters the preheating device through the intake end 72 for preheating; the preheated gas flows into the intake port of the kiln through the outlet end 71 and enters the interior of the kiln through the intake port; so that the atmosphere transported into the kiln has a relatively high temperature, thereby avoiding a large fluctuation phenomenon in the temperature uniformity of the furnace caused by a significant decrease in the temperature at the intake point inside the furnace. The support shaft 5 penetrates the space between the intake end 72 and the outlet end 71 and supports the lower end of the outlet end 71, which can effectively prevent the ventilation pipe 7 from sagging at the transition end 73 due to its own gravity, resulting in bending or breaking of the intake end 72 and the outlet end 71. In other embodiments, the support shaft 5 only needs to support below the outlet end 71 and the pipe above the outlet end 71 to support it. As Figure 2 shown, multiple groups of through holes 8 for the ventilation pipe 7 to pass through are provided on one side of the box body 2, so that multiple ventilation pipes 7 can be arranged inside the box body 2, and then the preheating device can heat multiple intake pipes simultaneously; at the same time, according to the requirements of the product process, the preheating device can be arranged on the intake pipes at different positions on the kiln to set different preheating temperatures for the intake pipes at different positions. The materials of the ventilation pipe 7, the intake pipe and other pipes for transporting gas are all selected as stainless steel materials, such as SUS310S, SUS316L materials; so that the pipes for transporting gas can withstand a sufficiently high temperature, and at the same time can effectively prevent the pipes from oxidizing and rusting at high temperatures, polluting the gas and the product.

[0029] The heating plate 3 is provided with an inlet hole 31; several rows of accommodating cavities 32 which are parallel to each other are arranged inside the heating plate 3. As Figure 3 , Figure 4 shown, the head and tail of several rows of accommodating cavities 32 are communicated with each other, and the accommodating cavities 32 are arranged along the length direction parallel to the heating plate 3; the inlet hole 31 is communicated with the accommodating cavity 32, and is used for passing the heating wire 4 through the inlet hole 31 and entering the accommodating cavity 32. In other embodiments, the accommodating cavity 32 may also be arranged along the width direction parallel to the heating plate 3. In this embodiment, the preheating device includes two heater assemblies 1, and the two heater assemblies 1 are symmetrically arranged on the inner side wall of the box body 2 and are arranged on the side adjacent to the side provided with the through hole 8. In other embodiments, the preheating device may also include one or more heater assemblies 1, and the heater assemblies 1 may also be arranged on any other side except the side provided with the through hole 8, as long as the actual use requirements can be met.

[0030] The preheating device further includes a thermocouple 6; as Figure 5 shown, the thermocouple 6 is arranged on the outer side surface of the box body 2 and extends into the box body 2, and is used for monitoring the temperature inside the preheating device in real time, so that the temperature inside the box body 2 can be adjusted in real time according to the use requirements, making the temperature change rate inside the box body tend to be stable and reducing the fluctuation range of the temperature inside the box body. Since the temperature on the surface of the heater assembly 1 is higher than the temperature inside the box body 2, in order to accurately measure the temperature inside the box body 2, the thermocouple 6 extending into the box body 2 cannot contact the heater assembly 1; in this embodiment, the thermocouple 6 extending into the box body 2 is located in the space between the air inlet end 72 and the air outlet end 71, so that there is a certain distance between the thermocouple 6 and the heater assembly 1, and thus the temperature inside the box body 2 can be detected more accurately, reducing the fluctuation range of the temperature inside the box body 2; at the same time, improving the control accuracy of the temperature inside the box body 2.

[0031] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An intake pipe preheating device, characterized in that, It includes a box body (2) and at least one heater assembly (1); a through hole (8) for the ventilation pipe (7) to pass through is provided on one side of the box body (2), the heater assembly (1) is arranged inside the box body (2) and is installed on the remaining sides of the box body (2); the heater assembly (1) includes a heating plate (3) and a heating wire (4); the heating wire (4) is in a spiral shape and is embedded in the heating plate (3); at least one support shaft (5) is arranged inside the box body (2); at least one of the support shafts (5) is arranged at a position far from the through hole (8) and below the ventilation pipe (7) for supporting the ventilation pipe (7).

2. The intake pipe preheating device according to claim 1, characterized in that: The ventilation pipe (7) is configured as a U shape and includes an air inlet end (72), an air outlet end (71) and a transition end (73); the air inlet end (72) and the air outlet end (71) are arranged in parallel, the support shaft (5) passes through the space between the air inlet end (72) and the air outlet end (71) and supports below the pipe at the upper part of the air inlet end (72) and the air outlet end (71).

3. The intake air pipe preheating device according to claim 2, characterized in that: A wire inlet hole (31) is provided on the heating plate (3); a receiving cavity (32) is arranged inside the heating plate (3); the wire inlet hole (31) is communicated with the receiving cavity (32) for passing the heating wire (4) through the wire inlet hole (31) and into the receiving cavity (32).

4. The intake pipe preheating device according to claim 3, characterized in that: The receiving cavities (32) are arranged in several rows parallel to each other, and the heads and tails of several rows of the receiving cavities (32) are communicated with each other; several rows of the receiving cavities (32) are arranged along the length direction or the width direction parallel to the heating plate (3).

5. The intake pipe preheating device according to claim 3, characterized in that: Two heater assemblies (1) are provided; the two heater assemblies (1) are symmetrically arranged inside the box body (2) and are arranged on the sides adjacent to the side provided with the through hole (8).

6. The intake pipe preheating device according to claim 2, characterized in that: It further includes a thermocouple (6); the thermocouple (6) is arranged on the outer side of the box body (2) and extends into the box body (2) for monitoring the temperature inside the preheating device.

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