A cleaning device for a tobacco leaf conditioning furnace heat exchanger

Abstract

The utility model discloses a kind of cleaning devices of hearth heat exchanger for tobacco leaf conditioning, including scraping ash plate and dust suction pipe, dust suction pipe includes dust suction section and connecting section, the one end of dust suction section is connected with the one end of connecting section, the included angle of dust suction section entry axis and connecting section axis is 45 °, scraping ash plate is circular, scraping ash plate is set on dust suction section, and scraping ash plate is close to dust suction section entry, scraping ash plate is perpendicular to connecting section, scraping ash plate has first end and second end, first end and second end are respectively located the both ends of same diameter of scraping ash plate, and the diameter intersects with dust suction section axis, dust suction section entry is towards first end, and the length of the projection of dust suction section on scraping ash plate is less than the length of scraping ash plate diameter. The device is simple in structure, convenient to use, high in cleaning efficiency, low in cleaning cost, good in cleaning effect, can collect and transfer cleaned dust in time, avoid dust adhering on tobacco leaf, improve tobacco quality.

Description

Technical Field

[0001] This utility model relates to the field of tobacco curing technology, specifically to a cleaning device for a furnace heat exchanger used in tobacco curing. Background Technology

[0002] Tobacco curing is a crucial step in tobacco processing. Currently, most commonly used equipment consists of a metal furnace. In this curing device, high-temperature flue gas (600-800℃) flows through a serpentine metal heat exchange tube group and is heated by the airflow of a circulating fan to cure the tobacco leaves in the curing barn.

[0003] During this process, because the furnace and heat exchanger are directly connected, some of the dust from the combustion particles in the furnace will accumulate inside the heat exchange tubes. These dust layers will severely reduce the heat transfer efficiency of the heat exchange tubes, resulting in a significant increase in equipment energy consumption, making it difficult to accurately control the furnace temperature, directly affecting the quality of tobacco curing, and posing safety hazards.

[0004] Currently, the cleaning of heat exchange tubes in metal furnaces mainly relies on traditional manual methods. After the equipment is shut down and cooled, operators need to open the ash removal doors on both sides of the firebox and use a semi-circular ash removal rake with an R50mm head to clean it.

[0005] This traditional cleaning method has several prominent drawbacks: 1. Extremely low cleaning efficiency: It requires repeated pushing and pulling multiple times to completely remove the dust around the heat exchange tubes. During the cleaning process, the cleaning angle also needs to be constantly adjusted to ensure the effect.

[0006] 2. High cleaning costs: Multiple cleaning operations are required to thoroughly remove dust from the heat exchange tubes, which significantly increases the cost of manual cleaning.

[0007] 3. Poor cleaning effect: Traditional cleaning tools are unable to thoroughly remove dead corners and hardened dust, resulting in incomplete cleaning.

[0008] 4. Damage to tobacco leaves: The dust cleaned up is easy to fall into the air outlet. During the processing of the next batch of tobacco leaves, the dust that falls off is easily attached to the tobacco leaves being processed by the airflow of the circulating fan, which seriously damages the quality of the tobacco leaves and the safety of use. Utility Model Content

[0009] To address the problems existing in the prior art, this utility model provides a cleaning device for a furnace heat exchanger used in tobacco curing. The device has a simple structure, is easy to use, has high cleaning efficiency, low cleaning cost, and good cleaning effect. It can collect and transfer the cleaned dust in a timely manner, preventing dust from adhering to the tobacco leaves and improving the quality of the tobacco leaves.

[0010] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows: A cleaning device for a furnace heat exchanger used in tobacco curing includes a scraper and a suction pipe. The suction pipe includes a suction section and a connecting section. One end of the suction section is connected to one end of the connecting section. The angle between the axis of the suction section inlet and the axis of the connecting section is 45°. The scraper is circular and is fitted onto the suction section, with the scraper close to the suction section inlet. The scraper is perpendicular to the connecting section. The scraper has a first end and a second end, which are located at opposite ends of the same diameter of the scraper. The diameter intersects the axis of the suction section. The suction section inlet faces the first end, and the length of the projection of the suction section onto the scraper is less than the length of the scraper diameter.

[0011] The dust suction section inlet is equipped with a dust suction nozzle, which is conical. The large end of the dust suction nozzle is connected to the dust suction section inlet. The dust suction structure composed of the dust suction nozzle and the dust suction section is a symmetrical structure, and the small end of the dust suction nozzle is a flat cuboid.

[0012] The angle between the plane where the suction nozzle inlet is located and the scraper plate is 20-30°.

[0013] The distance between the center of the suction nozzle inlet and the first end in the direction parallel to the scraper plate is 2-3cm, and the distance between the center of the suction nozzle inlet and the first end in the direction perpendicular to the scraper plate is 1-2cm.

[0014] It also includes a guide plate, which is circular and is fitted onto the connecting section. The guide plate is perpendicular to the connecting section, and the axis of the guide plate coincides with the axis of the connecting section. The projections of the scraper and the guide plate in the axial direction of the connecting section also coincide.

[0015] The vertical distance between the guide plate and the scraper plate is 23cm.

[0016] It also includes multiple support rods, with the support plates evenly distributed along the circumference of the guide plate. The two ends of each support rod are connected to the scraper plate and the guide plate, respectively, and each support rod is perpendicular to the guide plate.

[0017] Compared with the prior art, the beneficial effects and advantages of this utility model are as follows: 1. This device uses a circular scraper, which can clean a single heat exchange tube in 360 degrees circumference with just one push-pull action, reducing cleaning time from several hours to minutes and greatly improving work efficiency.

[0018] 2. The device uses a circular scraper blade, which ensures that dust in all directions of the heat exchange tube is effectively removed, avoiding cleaning dead corners and improving the cleaning effect.

[0019] 3. The device uses a circular scraper blade fitted onto the front end of the suction pipe. By introducing negative pressure into the suction pipe, it achieves "scraping and suction immediately". The dust is sucked away by the negative pressure the moment it falls off, which fundamentally eliminates the risk of dust falling into the air outlet of the heating chamber below and effectively prevents secondary pollution of the flue-cured tobacco leaves.

[0020] 4. The device has a simple structure, low manufacturing cost, and is easy to operate. It can be completed without professional personnel and is easy to promote. Attached Figure Description

[0021] Figure 1 A schematic diagram of the cleaning device for a furnace heat exchanger used in tobacco curing.

[0022] Figure 2 for Figure 1 The main view.

[0023] Among them, 1-scraper blade: 101-first end, 102-second end; 2-suction pipe: 201-suction section, 202-connecting section; 3-guide plate; 4-support rod; 5-suction nozzle. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] The structure of the cleaning device for the furnace heat exchanger for tobacco curing provided in this embodiment is as follows: Figure 1-2 As shown, the device includes a scraper 1, a suction pipe 2, a guide plate 3, a support rod 4, and a negative pressure mechanism (not shown) that provides negative pressure. The device is made of stainless steel, which has excellent corrosion resistance, mechanical properties, and durability, and is easy to clean.

[0026] The dust suction pipe 2 is a circular pipe with a diameter of 32-40mm; in this embodiment, the diameter is 36mm. The dust suction pipe 2 consists of a dust suction section 201 and a connecting section 202. One end of the dust suction section 201 is connected to one end of the connecting section 202. The length of the dust suction section 201 is 4-6cm, and the total length of the dust suction pipe 2 is 35-45cm. The angle between the axis of the inlet of the dust suction section 201 and the axis of the connecting section 202 is 45°. After the dust suction section 201 is bent, it is brought closer to the bottom of the heat exchange tube and the air outlet, facilitating negative pressure dust suction.

[0027] The dust suction section 201 is equipped with a dust suction nozzle 5 at its inlet. The dust suction nozzle 5 is conical, and its large end is connected to the inlet of the dust suction section 201. The dust suction structure formed by the dust suction nozzle 5 and the dust suction section 201 is a symmetrical structure. The small end of the dust suction nozzle 5 is a flat cuboid, and this shape of the dust suction nozzle 5 is more conducive to dust suction.

[0028] The scraper blade 1 is circular and has a diameter of 8-12cm. In this embodiment, the diameter of the scraper blade is 10cm.

[0029] The scraper blade 1 is fitted onto the dust suction section 201. The scraper blade 1 is close to the inlet of the dust suction section 201 and is perpendicular to the connecting section. The scraper blade 1 has a first end 101 and a second end 102. The first end 101 and the second end 102 are located at the two ends of the same diameter of the scraper blade 1, and the diameter intersects the axis of the dust suction section 201.

[0030] The inlet of the suction section 201 faces the first end 101, and the length of the projection of the suction section 201 onto the scraper plate 1 is less than the diameter of the scraper plate 1. The plane containing the inlet of the suction nozzle 5 forms an angle of 25° with the scraper plate 1. The distance between the center of the inlet of the suction nozzle 5 and the first end 101 in the direction parallel to the scraper plate 1 is 2.5 cm, and the distance between the center of the inlet of the suction nozzle 5 and the first end 101 in the direction perpendicular to the scraper plate 1 is 1.5 cm. The angle of the suction nozzle 5 and the distance between the suction nozzle 5 and the first end 101 in the two perpendicular directions are all designed to improve the dust collection effect.

[0031] The guide plate 3 is circular with a diameter of 8-12 cm. In this embodiment, the diameter of the guide plate 3 is 10 cm. The guide plate 3 is fitted onto the connecting section 202. The guide plate 3 is perpendicular to the connecting section 202, and the axis of the guide plate 3 coincides with the axis of the connecting section 202. The projections of the scraper plate 1 and the guide plate 3 on the axis of the connecting section 202 coincide, and the vertical distance between the guide plate 3 and the scraper plate 1 is 23 cm. When the scraper plate 1 is scraping ash, the guide plate 3 is always located inside the heat exchange tube. When the scraper plate 1 extends to the other end and needs to be retracted, since the guide plate 3 and the scraper plate 1 are always coaxial, the scraper plate 1 can be easily retracted, thus facilitating the retraction of the entire device.

[0032] There are multiple support rods 4, and multiple support plates 4 are evenly distributed along the circumference of the guide plate 3. The two ends of each support rod 4 are connected to the edges of the scraper plate 1 and the guide plate 3, respectively, and each support rod 4 is perpendicular to the guide plate 3. The support rods 4 can effectively support the scraper plate 1 and the guide plate 3, preventing deformation of the scraper plate 1 and the guide plate 3.

[0033] When using this device, connect the negative pressure mechanism to the end of the suction pipe 2 and the guide plate 3 that is closer to each other through the pipe. Then, while extending the scraper 1 into the heat exchange tube from one end, start the negative pressure device and push the scraper 1 towards the other end of the heat exchange tube. During the pushing process, the scraper 1 scrapes off the dust on the inner wall of the heat exchange tube. At the same time, the suction nozzle 5 sucks up the dust scraped off by the scraper 1 under the action of negative pressure. When the scraper 1 extends out of the other end of the heat exchange tube, the dust in the heat exchange tube is cleaned. Finally, pull the device out of the heat exchange tube through the guide plate.

Claims

1. A cleaning device for a furnace heat exchanger used in tobacco curing, characterized in that: The device includes a scraper and a suction pipe. The suction pipe includes a suction section and a connecting section. One end of the suction section is connected to one end of the connecting section. The angle between the axis of the suction section inlet and the axis of the connecting section is 45°. The scraper is circular and is fitted onto the suction section. The scraper is close to the suction section inlet and is perpendicular to the connecting section. The scraper has a first end and a second end, which are located at opposite ends of the same diameter of the scraper. The diameter intersects the axis of the suction section. The suction section inlet faces the first end, and the length of the projection of the suction section onto the scraper is less than the length of the scraper diameter.

2. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 1, characterized in that: The dust suction section inlet is equipped with a dust suction nozzle, which is conical. The large end of the dust suction nozzle is connected to the dust suction section inlet. The dust suction structure composed of the dust suction nozzle and the dust suction section is a symmetrical structure, and the small end of the dust suction nozzle is a flat cuboid.

3. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 2, characterized in that: The angle between the plane where the suction nozzle inlet is located and the scraper plate is 20-30°.

4. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 2, characterized in that: The distance between the center of the suction nozzle inlet and the first end in the direction parallel to the scraper plate is 2-3cm, and the distance between the center of the suction nozzle inlet and the first end in the direction perpendicular to the scraper plate is 1-2cm.

5. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 1, characterized in that: It also includes a guide plate, which is circular and is fitted onto the connecting section. The guide plate is perpendicular to the connecting section, and the axis of the guide plate coincides with the axis of the connecting section. The projections of the scraper and the guide plate in the axial direction of the connecting section also coincide.

6. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 5, characterized in that: The vertical distance between the guide plate and the scraper plate is 23cm.

7. The cleaning device for the furnace heat exchanger for tobacco curing according to claim 5, characterized in that: It also includes multiple support rods, with the support plates evenly distributed along the circumference of the guide plate. The two ends of each support rod are connected to the scraper plate and the guide plate, respectively, and each support rod is perpendicular to the guide plate.

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