Combustion-supporting air heating device

Abstract

The utility model discloses a combustion-supporting air heating device which comprises a kiln, and the kiln comprises a preheating section, a firing section, a slow cooling section and an air return pipeline. A front-end combustion-supporting fan and a rear-end combustion-supporting fan are respectively arranged at the top of the firing section, and a plurality of spray guns are arranged in the firing section; the front-end combustion fan comprises a front air inlet end and a front air outlet end, and the front air inlet end is connected with the air return pipeline; the rear-end combustion fan comprises a rear air inlet end and a rear air outlet end, and the rear air inlet end is connected with the air return pipeline; the air inlet end of the air return pipeline is connected with the slow cooling section; hot air of the slow cooling section is conveyed to the front-end combustion-supporting fan and the rear-end combustion-supporting fan through the air return pipeline, then the hot air is pumped to the spray guns in the front area and the rear area through the front-end combustion-supporting fan and the rear-end combustion-supporting fan, combustion-supporting air and heat are provided for burners of the spray guns, heat in smoke at the tail end of the kiln can be recycled, and the heat utilization efficiency of the kiln is improved. The combustion efficiency is improved, and the waste of resources is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic production, and more specifically, to a combustion-supporting air heating device. Background Art

[0002] During the ceramic production process, ceramic tiles are typically fired in roller hearth kilns. Existing roller hearth kilns use natural air directly as combustion air in the firing zone. This air experiences a significant temperature drop as it travels to the burner nozzles, wasting significant heat, reducing product heating efficiency, and increasing fuel consumption. Furthermore, the kiln's slow cooling zone generates a significant amount of flue gas, with exhaust temperatures typically ranging from 200°C to 250°C. This temperature is known as waste heat, and most of this waste heat is directly discharged into the atmosphere, resulting in a waste of heat and fuel while also impacting the environment. Utility Model Content

[0003] The present invention provides a combustion-supporting air heating device to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a combustion-supporting air heating device, comprising a kiln, wherein the kiln comprises a preheating section, a firing section, a slow cooling section and a return air duct; a front combustion-supporting air fan and a rear combustion-supporting air fan are respectively provided on the top of the firing section, and a plurality of spray guns are provided inside; the front combustion-supporting air fan comprises a front air inlet end and a front air outlet end, the front air inlet end is connected to the return air duct, and the front air outlet end is connected to a plurality of front conveying pipes; the front conveying pipe guides the combustion-supporting air to the spray guns at the front end of the firing section; the rear combustion-supporting air fan comprises a rear air inlet end and a rear air outlet end, the rear air inlet end is connected to the return air duct, and the rear air outlet end is connected to a plurality of rear conveying pipes, and the rear conveying pipe guides the combustion-supporting air to the spray guns at the rear end of the firing section; an air inlet end of the return air duct is connected to the slow cooling section.

[0004] Preferably, the return air duct includes a first air duct and a second air duct; a plurality of return air outlets are provided in sequence along the length direction at the top of the slow cooling section, and the return air outlets are respectively connected to the first air duct and the second air duct through pipes, the air outlet of the first air duct is connected to the front air inlet end, and the air outlet of the second air duct is connected to the rear air inlet end.

[0005] Preferably, a heating device is further included, and the heating device includes a waste heat air inlet and a heating air outlet; the waste heat air inlet is connected to the slow cooling section, and the heating air outlet is connected to the return air duct.

[0006] Preferably, a temperature sensor is provided in the return air duct, and the temperature sensor is connected to the heating device.

[0007] Preferably, the outer side of the return air duct is wrapped with a thermal insulation layer.

[0008] Preferably, the heating device is a PTC ceramic heating device.

[0009] Preferably, a dust removal device is provided between the return air duct and the slow cooling section, the air inlet of the dust removal device is connected to the slow cooling section, and the air outlet thereof is connected to the return air duct.

[0010] Preferably, the dust removal device includes a dust removal bin and a dust removal filter layer, and an openable bin door is provided on the side of the dust removal bin.

[0011] Preferably, the front-end combustion-supporting fan and the rear-end combustion-supporting fan are both variable frequency fans.

[0012] Preferably, it also includes a pressure sensor arranged in the return air duct, which is used to monitor the internal air pressure of the return air duct; a fresh air inlet is provided on the side wall of the return air duct, and a valve and an actuator are provided on the fresh air inlet, the valve is connected to the actuator and is driven by the actuator; the actuator is connected to the pressure sensor.

[0013] Compared with the existing technology, the present invention has the following beneficial effects: by using the return air duct to transport the hot air from the slow cooling section to the front combustion-supporting fan and the rear combustion-supporting fan, the front combustion-supporting fan and the rear combustion-supporting fan respectively pump the hot air to the spray guns in the front and rear areas, providing combustion-supporting air and heat for the burners of the spray guns, the present invention can achieve heat recovery and reuse in the flue gas at the end of the kiln, improve combustion efficiency, and reduce resource waste. The present invention has a reasonable design, a simple structure, and a high recovery and utilization rate of waste heat, which is not only low-cost but also helps protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a combustion-supporting air heating device according to an embodiment of the present utility model;

[0015] exist Figure 1 , the corresponding relationship between the names of the components and the accompanying drawing numbers is as follows:

[0016] 1--Preheating section, 2--Firing section, 3--Slow cooling section, 31--Return air outlet, 4--Return air duct, 41--First air duct, 42--Second air duct, 5--Front end combustion-supporting fan, 6--Rear end combustion-supporting fan, 7--Front end conveying pipeline, 8--Rear end conveying pipeline. DETAILED DESCRIPTION

[0017] The following embodiments of the present invention are further described in detail with reference to the accompanying drawings and examples. The accompanying drawings are for reference only and are not intended to limit the scope of the present invention. The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention.

[0018] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0020] Please refer to Figure 1 The utility model provides a combustion-supporting air heating device, which includes a kiln, and the kiln includes a preheating section 1, a firing section 2, a slow cooling section 3 and a return air duct 4; the top of the firing section 2 is respectively provided with a front-end combustion-supporting fan 5 and a rear-end combustion-supporting fan 6, and multiple spray guns are provided inside; the front-end combustion-supporting fan 5 includes a front air intake end and a front air outlet end, and the front air intake end is connected to the return air duct 4, and the front air outlet end is connected to multiple front-end delivery pipes 7; the front-end delivery pipe 7 guides the combustion-supporting air to the spray gun at the front end of the firing section 2; the rear-end combustion-supporting fan 6 includes a rear air inlet end and a rear air outlet end, and the rear air inlet end is connected to the return air duct 4, and the rear air outlet end is connected to multiple rear-end delivery pipes 8, and the rear-end delivery pipe 8 guides the combustion-supporting air to the spray gun at the rear end of the firing section 2; one air inlet end of the return air duct 4 is connected to the slow cooling section 3.

[0021] The existing roller kiln firing zone directly uses external natural air as combustion-supporting air. The direct delivery of external air causes the combustion-supporting air to drop in temperature significantly when it is sent to the burner, which wastes a lot of heat, reduces the thermal efficiency of the product, and increases fuel consumption. At the same time, the 200-250 degree hot air in the slow cooling section 3 at the end of the roller kiln is directly discharged to the outside, which is a waste. In this embodiment, the 200-250 degree slow cooling tail heat is pumped into the front combustion-supporting fan 5 and the rear combustion-supporting fan 6, which are then pumped to the burner of the spray gun by the two combustion-supporting fans to provide combustion-supporting air and heat, thereby raising the temperature of the kiln firing section 2 by more than 150 degrees, reducing the calorific value provided by the combustion of natural gas in the firing section 2.

[0022] Specifically, this embodiment is provided with a return air duct 4, one end of the return air duct 4 is connected to the slow cooling section 3, and the other end is respectively connected to the front-end combustion-supporting fan 5 and the rear-end combustion-supporting fan 6. The front-end combustion-supporting fan 5 transports the combustion-supporting air to the spray gun in the front area of ​​the firing section 2 through multiple front-end delivery pipelines 7, and the rear-end combustion-supporting fan 6 transports the combustion-supporting air to the spray gun in the rear area of ​​the firing section 2 through the rear-end delivery pipeline, thereby improving the uniformity of the combustion-supporting air supply.

[0023] During operation, the front combustion-supporting fan 5 and the rear combustion-supporting fan 6 are started and flue gas is extracted from the slow cooling section 3, and these flue gases with high basic temperature are sent to the front and rear sections of the burning section 2 as combustion-supporting air, respectively, to provide combustion-supporting air and heat for the burner of the spray gun.

[0024] Preferably, the return air duct 4 includes a first air duct 41 and a second air duct 42; a plurality of return air ports 31 are sequentially provided along the length direction at the top of the slow cooling section 3, and the return air ports 31 are respectively connected to the first air duct 41 and the second air duct 42 through pipes, the air outlet of the first air duct 41 is connected to the front air inlet end, and the air outlet of the second air duct 42 is connected to the rear air inlet end. In order to better extract the hot air containing a large amount of heat in the slow cooling section 3, the present embodiment provides a first air duct 41 and a second air duct 42, which correspond to the front combustion-supporting fan 5 and the rear combustion-supporting fan 6, respectively. The first air duct 41 and the second air duct 42 are respectively connected to the return air port 31 at the top of the slow cooling section 3, so as to better extract hot air from various areas of the slow cooling section 3.

[0025] Preferably, a heating device is further included, comprising a waste heat air inlet and a heating air outlet; the waste heat air inlet is connected to the slow cooling section 3, and the heating air outlet is connected to the return air duct 4. In this embodiment, the hot air from the slow cooling section 3 is affected by the environment, and its base temperature may fluctuate significantly in different seasons. Therefore, this embodiment is provided with a heating device to heat the hot air entering the return air duct 4, thereby further increasing the temperature of the hot air to meet the needs of the firing section 2.

[0026] Preferably, a temperature sensor is provided in the return air duct 4 and connected to the heating device. The temperature sensor is provided to monitor the temperature in the return air duct 4 and the heating power of the heating device is controlled according to the detected data to achieve an automatic heating effect.

[0027] Preferably, the outer side of the return air duct 4 is wrapped with a heat-insulating layer. In this embodiment, a heat-insulating layer is wrapped on the outer side of the return air duct 4 to reduce heat loss during the hot air transportation process.

[0028] Preferably, the heating device is a PTC ceramic heating device.

[0029] Preferably, a dust removal device is provided between the return air duct 4 and the slow cooling section 3, with the air inlet of the dust removal device connected to the slow cooling section 3 and the air outlet thereof connected to the return air duct 4. By providing the dust removal device, the dust content in the hot air transported from the slow cooling section 3 can be effectively reduced, and the accumulation of dust in the front-end combustion-supporting fan 5 and the rear-end combustion-supporting fan 6 can be reduced, thereby reducing the impact on the combustion-supporting effect.

[0030] Preferably, the dust removal device includes a dust removal bin and a dust removal filter layer, and the side of the dust removal bin is provided with an openable bin door. Through the above structural design, the openable bin door is convenient for quick cleaning or replacement of the dust removal filter layer.

[0031] Preferably, the front-end combustion-supporting fan 5 and the rear-end combustion-supporting fan 6 are both variable frequency fans.

[0032] Preferably, it further includes a pressure sensor provided in the return air duct 4, the pressure sensor being used to monitor the internal air pressure of the return air duct 4; a fresh air inlet being provided on the side wall of the return air duct 4, a valve and an actuator being provided on the fresh air inlet, the valve being connected to and driven by the actuator; the actuator being connected to the pressure sensor. In this embodiment, the air pressure in the return air duct 4 is monitored by providing a pressure sensor, and once an abnormality in the air pressure occurs, the actuator is activated to open the valve, allowing outside air to enter the return air duct 4, thereby avoiding an air short circuit that causes an overload of the front-end combustion-supporting fan 5 or the rear-end combustion-supporting fan 6. Furthermore, an alarm device can be provided, and the alarm device is connected to the pressure sensor. When an abnormal air pressure is detected, a reminder can be issued to the outside through the alarm device.

[0033] Compared with the existing technology, the present invention has the following beneficial effects: by using the return air duct to transport the hot air from the slow cooling section to the front combustion-supporting fan and the rear combustion-supporting fan, the front combustion-supporting fan and the rear combustion-supporting fan respectively pump the hot air to the spray guns in the front and rear areas, providing combustion-supporting air and heat for the burners of the spray guns, the present invention can achieve heat recovery and reuse in the flue gas at the end of the kiln, improve combustion efficiency, and reduce resource waste. The present invention has a reasonable design, a simple structure, and a high recovery and utilization rate of waste heat, which is not only low-cost but also helps protect the environment.

[0034] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A combustion-supporting air heating device, characterized in that: The invention comprises a kiln, wherein the kiln comprises a preheating section (1), a firing section (2), a slow cooling section (3) and a return air duct (4); a front combustion-supporting blower (5) and a rear combustion-supporting blower (6) are respectively provided on the top of the firing section, and a plurality of spray guns are provided inside; the front combustion-supporting blower comprises a front air inlet end and a front air outlet end, the front air inlet end is connected to the return air duct, and the front air outlet end is connected to a plurality of front conveying pipes (7); the front conveying pipe guides the combustion-supporting air to the spray gun at the front end of the firing section; the rear combustion-supporting blower comprises a rear air inlet end and a rear air outlet end, the rear air inlet end is connected to the return air duct, and the rear air outlet end is connected to a plurality of rear conveying pipes (8), and the rear conveying pipe guides the combustion-supporting air to the spray gun at the rear end of the firing section; an air inlet end of the return air duct is connected to the slow cooling section.

2. The combustion-supporting air heating device according to claim 1, characterized in that: The return air duct includes a first air duct (41) and a second air duct (42); a plurality of return air ports (31) are sequentially provided at the top of the slow cooling section along the length direction, and the return air ports are respectively connected to the first air duct and the second air duct through pipes, the air outlet of the first air duct is connected to the front air inlet end, and the air outlet of the second air duct is connected to the rear air inlet end.

3. The combustion-supporting air heating device according to claim 1, characterized in that: It also includes a heating device, which includes a waste heat air inlet and a heating air outlet; the waste heat air inlet is connected to the slow cooling section, and the heating air outlet is connected to the return air duct.

4. The combustion-supporting air heating device according to claim 3, characterized in that: A temperature sensor is provided in the return air duct, and the temperature sensor is connected to the heating device.

5. The combustion-supporting air heating device according to claim 3, characterized in that: The outer side of the return air duct is wrapped with a thermal insulation layer.

6. The combustion-supporting air heating device according to claim 3, characterized in that: The heating device is a PTC ceramic heating device.

7. The combustion-supporting air heating device according to claim 1, characterized in that: A dust removal device is provided between the return air duct and the slow cooling section, the air inlet of the dust removal device is connected to the slow cooling section, and the air outlet thereof is connected to the return air duct.

8. The combustion-supporting air heating device according to claim 7, characterized in that: The dust removal device includes a dust removal bin and a dust removal filter layer, and an openable bin door is provided on the side of the dust removal bin.

9. The combustion-supporting air heating device according to claim 1, characterized in that: The front-end combustion-supporting fan and the rear-end combustion-supporting fan are both variable frequency fans.

10. The combustion-supporting air heating device according to any one of claims 1 to 9, characterized in that: It also includes a pressure sensor arranged in the return air duct, which is used to monitor the internal air pressure of the return air duct; a fresh air inlet is provided on the side wall of the return air duct, and a valve and an actuator are provided on the fresh air inlet, the valve is connected to the actuator and is driven by the actuator; the actuator is connected to the pressure sensor.

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