A tubular air preheater

Abstract

The application discloses a tubular air preheater and belongs to the technical field of tubular air preheaters.The tubular air preheater comprises a preheater body, the preheater body comprises a mounting frame, a plurality of groups of heat exchange mechanisms are longitudinally arranged in the mounting frame, air inlet pipes are arranged on the two sides of the preheater body, the two groups of air inlet pipes are communicated with the inside of the preheater body, and the air inlet pipes are arranged perpendicularly to the heat exchange mechanisms. When the tubular air preheater is used, hot air passes through the inside of the rotary pipe, cold air enters the inside of the mounting frame through the air inlet pipes, and the cold and hot air flowing perpendicularly exchanges heat through the outer wall of the rotary pipe. A plurality of groups of vertical plates arranged crosswise in the inside of the mounting frame can form a zigzag air flow channel, a plurality of groups of heat exchange mechanisms are arranged between the plurality of groups of vertical plates, the residence time of cold air in the inside of the mounting frame can be greatly prolonged, the rotary bending design of the rotary pipe can prolong the residence time of hot air in the inside of the rotary pipe, and the heat exchange efficiency can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of tubular air preheater technology, and more particularly to a tubular air preheater. Background Technology

[0002] An air preheater is a heat exchange surface in the boiler tail flue where the flue gas preheats the air entering the boiler to a certain temperature through internal heat dissipation fins. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. Tubular air preheaters are important heat exchange devices in boiler systems. They preheat cold air before sending it into the furnace through heat exchange between flue gas and air, thereby improving combustion efficiency and reducing exhaust gas temperature.

[0003] Existing conventional tubular preheaters use straight tubes to transfer heat from flue gas. However, the contact area between ordinary straight tubes and air is relatively small, and the hot flue gas passes through quickly, resulting in a generally poor heat transfer effect. Furthermore, cold air often passes directly into the preheater without rotation, so the preheating effect needs to be improved. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a tubular air preheater that overcomes these deficiencies. It aims to solve the problem that conventional tubular preheaters in the prior art use straight tubes to transfer heat from flue gas. However, ordinary straight tubes have a relatively small contact area with air, resulting in a relatively fast flow rate of hot flue gas and generally poor heat transfer efficiency. Furthermore, cold air entering the preheater often passes directly through without rotation, leading to insufficient preheating performance.

[0005] To achieve the above objectives, this application provides the following technical solution: a tubular air preheater, comprising a preheater body, the preheater body including an installation frame, multiple sets of heat exchange mechanisms longitudinally installed inside the installation frame, air inlet pipes installed on both sides of the preheater body, both sets of air inlet pipes communicating with the interior of the preheater body, the air inlet pipes and the heat exchange mechanisms being arranged perpendicularly to each other, multiple sets of vertical plates being arranged inside the installation frame, the multiple sets of vertical plates being installed in a cross manner at the top and bottom of the installation frame, the multiple sets of heat exchange mechanisms being installed between the multiple sets of vertical plates, the heat exchange mechanism including a rotary tube, and fixing plates being installed at both ends of the rotary tube.

[0006] By adopting the above technical solution, when this application is in use, hot air passes through the inside of the rotary tube, and external cold air enters the inside of the mounting frame through the air inlet pipe. The vertically flowing hot and cold air achieves heat exchange through the outer wall of the rotary tube. The multiple sets of vertical plates arranged crosswise inside can form a tortuous air circulation channel inside the mounting frame. Moreover, the multiple heat exchange mechanisms installed between the multiple sets of vertical plates can greatly extend the residence time of cold air inside the mounting frame. Furthermore, the tortuous design of the rotary tube can increase the residence time of hot air inside the rotary tube, which can effectively improve the heat exchange efficiency.

[0007] As a preferred technical solution of this application, a cleaning mechanism is provided at the bottom of the bend of each of the multiple sets of rotary tubes. The cleaning mechanism includes a connecting pipe, which is connected to the interior of the rotary tube, and a connecting cap is installed on the top of the connecting pipe.

[0008] By adopting the above technical solution and setting up a cleaning mechanism, when the hot air contains dust, the dust will accumulate on the inner wall of the rotating tube as the hot air stays inside. At this time, the operator can clean the inside of the rotating tube by opening the connecting cover, and can also insert cleaning tools along the connecting pipe into the inside of the rotating tube for cleaning, thus improving the practicality of the device.

[0009] As a preferred technical solution of this application, crossbars are provided on both sides of the preheater body, and connecting plates are installed on the top and bottom of one side of the fixing plate. Connecting bolts are installed inside the connecting plates. Multiple sets of heat exchange mechanisms are respectively installed on the upper and lower sides of the crossbars. One set of connecting bolts passes through the connecting plate and bolts to connect the crossbars, and the other set of connecting bolts is bolted to the preheater body.

[0010] By adopting the above technical solution and setting up crossbars, the fixing plate can be fixedly connected to the mounting frame and crossbars by connecting bolts during use. This makes it more convenient for staff to disassemble individual heat exchange mechanisms and carry out maintenance.

[0011] As a preferred technical solution of this application, a filter screen is provided on one side of each of the two sets of air intake pipes, and a fixing bolt is provided at the four corners of the filter screen. The fixing bolt passes through the filter screen and the air intake pipe for threaded connection.

[0012] By adopting the above technical solution and setting up a filter screen, the cold air entering the installation frame can be filtered during use. At the same time, the fixing bolts can be used to quickly install and remove the filter screen, improving the practicality of the device.

[0013] As a preferred technical solution of this application, multiple sets of heat dissipation fins are fixedly installed on the outside of the rotary tube, and the distance between the multiple sets of heat dissipation fins is the same.

[0014] By adopting the above technical solution and setting heat dissipation fins, the contact area between the outside of the rotary tube and the cold air can be increased during use, thereby further improving the heat exchange efficiency.

[0015] As a preferred technical solution of this application, multiple sets of temperature sensors are evenly arranged on the exterior of the multiple sets of upright plates and on the inner wall of the mounting frame.

[0016] By adopting the above technical solution and setting a temperature sensor, the internal temperature of the preheater body can be detected during use, thereby improving the practicality of the device.

[0017] As a preferred technical solution of this application, the ends of both sets of air inlet pipes that are away from the preheater body are conical.

[0018] By adopting the above technical solution and setting the air intake pipe to a conical shape, the air intake efficiency can be effectively improved, thus enhancing the practicality of the device.

[0019] The beneficial effects of this application are: 1. In use, hot air passes through the inside of the rotary tube, while external cold air enters the inside of the mounting frame through the air inlet pipe. The vertically flowing hot and cold air exchange heat through the outer wall of the rotary tube. The multiple sets of vertical plates arranged crosswise inside the mounting frame can form a tortuous airflow channel. Furthermore, the multiple heat exchange mechanisms installed between the multiple sets of vertical plates can greatly extend the residence time of cold air inside the mounting frame. The tortuous design of the rotary tube can also increase the residence time of hot air inside the rotary tube, effectively improving the heat exchange efficiency.

[0020] 2. By setting up a cleaning mechanism, when the hot air contains dust, the dust will accumulate on the inner wall of the rotating tube as the hot air stays inside. At this time, the operator can clean the inside of the rotating tube by opening the connecting cover, and can also insert cleaning tools into the inside of the rotating tube along the connecting pipe to clean it, thus improving the practicality of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the intake pipe structure for this application; Figure 3 This is a schematic diagram of the heat exchange mechanism structure in this application; Figure 4 This is a schematic diagram of the preheater body structure of this application; Figure 5 This is a schematic diagram of the cleaning organization structure in this application.

[0022] In the diagram: 1. Preheater body; 101. Mounting frame; 102. Crossbar; 2. Inlet pipe; 3. Heat exchange mechanism; 301. Rotary pipe; 302. Fixing plate; 303. Connecting plate; 304. Connecting bolt; 305. Heat dissipation fins; 4. Vertical plate; 5. Filter screen; 501. Fixing bolt; 6. Cleaning mechanism; 601. Connecting pipe; 602. Connecting cover; 7. Temperature sensor. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] Reference Figure 1-5 A tubular air preheater includes a preheater body 1, which includes a mounting frame 101. Multiple sets of heat exchange mechanisms 3 are longitudinally installed inside the mounting frame 101. Air inlet pipes 2 are installed on both sides of the preheater body 1, and both sets of air inlet pipes 2 are connected to the interior of the preheater body 1. The air inlet pipes 2 and the heat exchange mechanisms 3 are arranged perpendicularly to each other. Multiple sets of vertical plates 4 are installed inside the mounting frame 101, and the multiple sets of vertical plates 4 are installed at the top and bottom of the mounting frame 101 in a crisscross manner. The multiple sets of heat exchange mechanisms 3 are installed on the multiple sets of vertical plates 4. Between them, the heat exchange mechanism 3 includes a rotary tube 301, and fixed plates 302 are installed at both ends of the rotary tube 301; crossbars 102 are provided on both sides of the preheater body 1, and connecting plates 303 are installed on the top and bottom of one side of the fixed plate 302. Connecting bolts 304 are installed inside the connecting plate 303. Multiple sets of heat exchange mechanisms 3 are installed on the upper and lower sides of the crossbars 102 respectively. One set of connecting bolts 304 passes through the connecting plate 303 and is bolted to the crossbar 102, and the other set of connecting bolts 304 is bolted to the preheater body 1.

[0025] In use, hot air passes through the interior of the rotary tube 301, while external cold air enters the interior of the mounting frame 101 through the air inlet pipe 2. The vertically flowing hot and cold air exchange heat through the outer wall of the rotary tube 301. The multiple sets of vertical plates 4 arranged crosswise inside the mounting frame 101 form a tortuous airflow channel, and the multiple sets of heat exchange mechanisms 3 are installed between the multiple sets of vertical plates 4, which can greatly extend the residence time of cold air inside the mounting frame 101. The tortuous design of the rotary tube 301 can increase the residence time of hot air inside the rotary tube 301, which can effectively improve the heat exchange efficiency. By setting the crossbar 102, the fixing plate 302 can be fixedly connected to the mounting frame 101 and the crossbar 102 by the connecting bolts 304 during use. It is more convenient to disassemble individual heat exchange mechanisms 3 in the future, making it easier for staff to carry out maintenance.

[0026] Reference Figure 2-5 Each of the bends in the multiple sets of rotating pipes 301 is equipped with a cleaning mechanism 6. The cleaning mechanism 6 includes a connecting pipe 601, which is connected to the interior of the rotating pipe 301. A connecting cover 602 is installed on the top of the connecting pipe 601. Each of the two sets of air inlet pipes 2 is equipped with a filter screen 5 on one side. Fixing bolts 501 are installed at the four corners of the filter screen 5, and the fixing bolts 501 pass through the filter screen 5 and are threadedly connected to the air inlet pipe 2. Multiple sets of temperature sensors 7 are evenly arranged on the exterior of the multiple sets of vertical plates 4 and on the inner wall of the mounting frame 101. By setting up the cleaning mechanism 6, when the hot air contains dust, the hot air in the rotating pipe 301 is cleaned. Dust will accumulate on the inner wall of the 01 tube. At this time, the staff can clean the inside of the rotary tube 301 by opening the connecting cover 602. The cleaning tool can also be inserted into the inside of the rotary tube 301 along the connecting pipe 601 to clean it, improving the practicality of the device. By setting up the filter screen 5, the cold air entering the mounting frame 101 can be filtered during use. At the same time, the fixing bolts 501 can quickly install and remove the filter screen 5, improving the practicality of the device. By setting up the temperature sensor 7, the internal temperature of the preheater body 1 can be detected during use, improving the practicality of the device.

[0027] Reference Figure 2-5 Multiple sets of heat dissipation fins 305 are fixedly installed on the outside of the rotary tube 301, and the distance between the multiple sets of heat dissipation fins 305 is the same. By setting the heat dissipation fins 305, the contact area between the outside of the rotary tube 301 and the cold air can be increased during use, which can further improve the heat exchange efficiency. The ends of the two sets of air inlet pipes 2 away from the preheater body 1 are both conical. By setting the air inlet pipes 2 to be conical, the air intake efficiency can be effectively improved, and the practicality of the device can be improved.

[0028] Working principle: In use, hot air passes through the inside of the rotary tube 301, while external cold air enters the inside of the mounting frame 101 through the air inlet pipe 2. The vertically flowing hot and cold air achieves heat exchange through the outer wall of the rotary tube 301. The multiple sets of vertical plates 4 arranged crosswise inside the mounting frame 101 can form a tortuous airflow channel, and the multiple sets of heat exchange mechanisms 3 are installed between the multiple sets of vertical plates 4, which can greatly extend the residence time of cold air inside the mounting frame 101. The tortuous design of the rotary tube 301 can increase the residence time of hot air inside the rotary tube 301, which can effectively improve the heat exchange efficiency. By setting a cleaning mechanism 6, when the hot air contains dust, the dust will be deposited on the inner wall of the rotary tube 301. At this time, the operator can clean the inside of the rotary tube 301 by opening the connecting cover 602, and can also insert cleaning tools into the inside of the rotary tube 301 through the connecting pipe 601 for cleaning, which improves the practicality of the device. Among them, by setting the crossbar 102, the fixing plate 302 can be fixedly connected to the mounting frame 101 and the crossbar 102 by connecting bolts 304 during use. This makes it more convenient to disassemble the individual heat exchange mechanism 3 later, and facilitates maintenance by the staff. By setting the filter screen 5, the cold air entering the mounting frame 101 can be filtered during use. At the same time, the fixing bolts 501 can quickly install and remove the filter screen 5, improving the practicality of the device. Meanwhile, by setting heat dissipation fins 305, the contact area between the outside of the rotary tube 301 and the cold air can be increased during use, which can further improve the heat exchange efficiency. In addition, by setting a temperature sensor 7, the internal temperature of the preheater body 1 can be detected during use, improving the practicality of the device; by setting the air intake pipe 2 to be conical, the air intake efficiency can be effectively improved, further enhancing the practicality of the device.

[0029] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tubular air preheater, comprising a preheater body (1), characterized in that, The preheater body (1) includes an installation frame (101). Multiple sets of heat exchange mechanisms (3) are installed longitudinally inside the installation frame (101). Air inlet pipes (2) are installed on both sides of the preheater body (1). Both sets of air inlet pipes (2) are connected to the interior of the preheater body (1). The air inlet pipes (2) and the heat exchange mechanisms (3) are arranged perpendicularly to each other. Multiple sets of vertical plates (4) are installed inside the installation frame (101). The multiple sets of vertical plates (4) are installed at the top and bottom of the installation frame (101) in a cross manner. The multiple sets of heat exchange mechanisms (3) are installed between the multiple sets of vertical plates (4). The heat exchange mechanism (3) includes a rotary tube (301). Fixed plates (302) are installed at both ends of the rotary tube (301).

2. A tubular air preheater according to claim 1, characterized in that, A cleaning mechanism (6) is provided at the bottom of the bend of each of the multiple sets of rotary tubes (301). The cleaning mechanism (6) includes a connecting tube (601), which is connected to the interior of the rotary tube (301). A connecting cap (602) is installed on the top of the connecting tube (601).

3. A tubular air preheater according to claim 1, characterized in that, The preheater body (1) is provided with crossbars (102) on both sides. The fixed plate (302) is provided with connecting plates (303) on the top and bottom of one side. The connecting plate (303) is provided with connecting bolts (304). Multiple sets of heat exchange mechanisms (3) are respectively installed on the upper and lower sides of the crossbar (102). One set of connecting bolts (304) passes through the connecting plate (303) and is bolted between it and the crossbar (102). The other set of connecting bolts (304) is bolted to the preheater body (1).

4. A tubular air preheater according to claim 1, characterized in that, Each of the two sets of air intake pipes (2) is provided with a filter screen (5) on one side. The filter screen (5) is provided with a fixing bolt (501) at the four corners. The fixing bolt (501) is threaded through the filter screen (5) and the air intake pipe (2).

5. A tubular air preheater according to claim 1, characterized in that, Multiple sets of heat dissipation fins (305) are fixedly installed on the outside of each rotary tube (301), and the distance between the multiple sets of heat dissipation fins (305) is the same.

6. A tubular air preheater according to claim 1, characterized in that, Multiple sets of temperature sensors (7) are evenly arranged on the outside of the multiple sets of the upright plates (4) and on the inner wall of the mounting frame (101).

7. A tubular air preheater according to claim 1, characterized in that, Both sets of air inlet pipes (2) have a tapered end away from the preheater body (1).

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