Fresh air preheating system of drying tower

Abstract

The invention discloses a drying tower fresh air preheating system, and belongs to the technical field of drying tower drying, the drying tower fresh air preheating system comprises a drying tower plant, one side of the drying tower plant is provided with an air inlet, the inner side of the air inlet is provided with filtering equipment fixed on the side wall of the drying tower plant, and one side in the drying tower plant is provided with an air supply chamber; a ventilation opening is formed in the air supply chamber, an induced draft fan is installed on the air supply chamber, an air feeder is installed in the air supply chamber, the air feeder is connected to a heating module located on the outer side of the air supply chamber through an air supply pipeline, and the heating module is connected to a drying tower installed on an operation platform in the drying tower plant through a steam pipeline. And the drying tower is connected with a cyclone separator through an exhaust pipeline and is communicated to the outside of the drying tower plant. By means of the fresh air preheating system of the drying tower, the steam consumption of the fresh air preheating system can be greatly reduced, fuel consumption is saved, and the exhaust air temperature is reduced to a certain degree.

Description

Technical Field

[0001] The present invention relates to the technical field of drying tower drying, and in particular to a fresh air preheating system for a drying tower. Background Art

[0002] The fresh air heating of the milk powder drying system includes two processes: steam preheating and steam heating. First, high-temperature steam generated by a boiler is used to preheat the fresh air. Taking the ambient temperature of -20°C as an example, about 3.5 t / h of steam is consumed during the steam preheating process to heat the incoming air to about 35°C. During the steam heating process, the fresh air is further heated to the drying temperature and sent into the drying tower, consuming 8 t / h of steam, and then discharged into the atmosphere after passing through the milk powder drying process. On the other hand, the steam heater, drying tower, conveying pipeline, and steam pipeline are all arranged in the drying tower workshop. The surfaces of these devices and pipelines maintain a very high temperature, causing the air in the drying tower workshop to be heated, with a relatively high temperature, resulting in a large amount of heat loss, and the working environment becoming extremely harsh.

[0003] When the fresh air is preheated with steam generated by a steam boiler, problems such as pipeline icing are likely to occur at low ambient temperatures, affecting the steam preheating process and reducing production efficiency. To solve the above problems, a new air preheating method needs to be studied. Summary of the Invention

[0004] The purpose of the present invention is to provide a fresh air preheating system for a drying tower, which can greatly reduce the steam consumption of the fresh air heating system, save fuel consumption, and reduce the exhaust air temperature to a certain extent.

[0005] To achieve the above purpose, the present invention provides a fresh air preheating system for a drying tower, including a drying tower workshop. An air inlet is provided on one side of the drying tower workshop. A filtering device fixed to the side wall of the drying tower workshop is installed inside the air inlet. A blower chamber is arranged on one side inside the drying tower workshop. A ventilation opening is provided on the blower chamber and an induced draft fan is installed. A blower is installed inside the blower chamber. The blower is connected to a heating module located outside the blower chamber through a blower pipeline. The heating module is connected to a drying tower installed on the working platform inside the drying tower workshop through a steam pipeline. The drying tower is connected to a cyclone separator through an exhaust pipeline and communicates to the outside of the drying tower workshop.

[0006] Preferably, a shutter is installed at the air inlet.

[0007] Preferably, the filtering device includes a dust removal component, a sterilization net, and an activated carbon net.

[0008] Preferably, a fresh air diversion device is installed inside the drying tower workshop.

[0009] Preferably, metal fins are installed on the steam pipeline and the exhaust pipeline.

[0010] Preferably, the heating module includes a main heater and a steam boiler. The main heater is connected between the air blower and the drying tower and is located inside the drying tower workshop. The steam boiler is located outside the drying tower workshop and exchanges heat with the main heater through a steam pipeline.

[0011] Preferably, the steam boiler is a gas boiler.

[0012] Therefore, the beneficial effects of adopting the above new air preheating system for a drying tower in the present invention are as follows:

[0013] (1) The present invention utilizes the sensible heat on the surfaces of the drying tower and the high-temperature equipment inside the workshop to preheat the new air, greatly increasing the initial temperature of the new air entering the steam heater, reducing the steam consumption, saving the gas consumption, and achieving the effect of energy conservation and emission reduction.

[0014] (2) The present invention partially or completely replaces the steam preheating system, reduces the gas consumption, and reduces the operating cost on the premise of ensuring the drying effect.

[0015] (3) The present invention partially or completely replaces the steam preheating system, reduces the complexity and accident rate of the preheating system, and improves the stability of the system operation.

[0016] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0017] Figure 1 is a top view schematic diagram of an embodiment of a new air preheating system for a drying tower of the present invention;

[0018] Figure 2 is a front cross-sectional schematic diagram of an embodiment of a new air preheating system for a drying tower of the present invention.

[0019] Reference Signs

[0020] 1, louver; 2, filtering device; 3, induced draft fan; 4, air blower; 5, main heater; 6, steam boiler; 7, drying tower; 8, drying tower workshop; 9, air supply chamber; 10, side wall of the drying tower workshop; 11, ceiling of the drying tower workshop; 12, operation platform. Detailed Embodiments

[0021] The technical solutions of the present invention will be further described below through the drawings and embodiments.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] Embodiment 1

[0024] As Figure 1 shown, the present invention provides a fresh air preheating system for a drying tower, including a drying tower plant 8. An air inlet is provided on the side wall 10 of the drying tower plant, and a louver 1 is installed at the air inlet to prevent larger sundries from entering the drying tower plant 8. As Figure 1 and Figure 2 shown, the louver 1 in this embodiment is installed on the wall opposite to the air supply chamber 9, and one or more louvers can also be installed on other side walls 10 of the drying tower plant or on the ceiling 11 of the drying tower plant as needed.

[0025] A filtering device 2 fixed to the side wall 10 of the drying tower plant is installed inside the air inlet. The filtering device 2 includes a dust removal component, a sterilization net and an activated carbon net, and is used to respectively remove dust, sterilize and absorb harmful gases from the fresh air.

[0026] An air supply chamber 9 is provided on one side inside the drying tower plant 8. A ventilation opening communicating with the drying tower plant 8 is provided on the air supply chamber 9, and an induced draft fan 3 is installed on the ventilation opening to convey the air inside the drying tower plant 8 into the air supply chamber 9, so as to form a negative pressure inside the drying tower plant 8, thereby facilitating the inflow of fresh air from the air inlet into the drying tower plant 8.

[0027] An air blower 4 is installed inside the air supply chamber 9. The air blower 4 is connected to a heating module located outside the air supply chamber 9 through an air supply pipeline. The heating module includes a main heater 5 and a steam boiler 6. The main heater 5 is connected between the air blower 4 and the drying tower 7 and is located inside the drying tower plant 8, and the steam boiler 6 is located outside the drying tower plant 8 and exchanges heat with the main heater 5 through a steam pipeline. The steam boiler 6 provides high-temperature steam for the main heater 5, and a gas boiler is adopted in this embodiment.

[0028] The main heater 5 is connected to the drying tower 7 installed on the operation platform 12 in the drying tower workshop 8 through a steam pipeline. The drying tower 7 is connected to a cyclone separator through an exhaust pipeline and communicates to the outside of the drying tower workshop 8.

[0029] The preheating process of the fresh air is completed in the drying tower workshop 8. Since the surfaces of these devices and pipelines such as the drying tower 7, the main heater 5, the steam pipeline, the air supply pipeline, and the exhaust pipeline are exposed and maintain a relatively high temperature, the fresh air flowing through the surfaces of these devices is heated under the action of radiation and convection. The preheated fresh air is sent into the air supply chamber 9 by the induced draft fan 3, and the air supply fan 4 sends the preheated fresh air to the main heater 5 through the pipeline for further heating to the drying temperature. The fresh air that meets the drying standard enters the drying tower 7 through the air supply pipeline and is discharged into the atmosphere outside the drying tower workshop 8 after completing the drying process flow through devices such as the cyclone separator.

[0030] In order to further improve the preheating effect of the fresh air, measures can be taken such as installing a fresh air diversion device in the drying tower workshop 8 to enable more fresh air to come into contact with the surfaces of various high-temperature devices for a long time and at the same time isolate potential external pollution sources. In addition, metal fins can be installed on the steam pipeline and the exhaust pipeline to increase the heat exchange area with the fresh air, thereby achieving better preheating of the fresh air.

[0031] Therefore, the present invention adopts the above-mentioned drying tower fresh air preheating system, which utilizes the sensible heat on the surfaces of the high-temperature devices in the drying tower and its drying tower workshop to preheat the fresh air, saves the steam consumption of the fresh air with steam waste heat, reduces the exhaust air temperature, and reduces the heat pollution; partially or completely replaces the steam preheating system, and reduces the accident rate of the system operation and enhances the operation stability on the premise of ensuring the drying effect.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A drying tower fresh air preheating system, characterized in that: It includes a drying tower building, one side of the drying tower building is provided with an air inlet, the inner side of the air inlet is provided with a filtering device fixed on the side wall of the drying tower building, one side of the drying tower building is provided with an air supply chamber, the air supply chamber is provided with a vent and is provided with an induced draft fan, an air supply fan is installed in the air supply chamber, the air supply fan is connected to a heating module located outside the air supply chamber through an air supply duct, the heating module is connected to a drying tower installed on a working platform in the drying tower building through a steam pipe, the drying tower is connected to a decyclone separator through an exhaust duct and is connected to the outside of the drying tower building.

2. A drying tower fresh air preheating system according to claim 1, characterized in that: A shutter is installed at the air inlet.

3. A drying tower fresh air preheating system according to claim 1, characterized in that: The filtering device comprises a dust removal component, a sterilization net and an activated carbon net.

4. A drying tower fresh air preheating system according to claim 1, characterized in that: A new air guide device is installed in the drying tower plant.

5. A drying tower fresh air preheating system according to claim 1, characterized in that: Metal fins are installed on the steam pipe and the exhaust pipe.

6. A drying tower fresh air preheating system according to claim 1, characterized in that: The heating module includes a main heater and a steam boiler. The main heater is connected between the blower and the drying tower and is located in the drying tower building. The steam boiler is located outside the drying tower building and performs heat exchange with the main heater through a steam pipe.

7. A drying tower fresh air preheating system according to claim 6, characterized in that: The steam boiler is a gas boiler.

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