Pipeline cleaning device for anti-corrosion composite pipe air preheater

Abstract

The invention discloses an anti-corrosion composite pipe air preheater pipeline cleaning device and belongs to the technical field of pipeline cleaning. An inner pipe is sleeved with an outer pipe and slides in the outer pipe, a set of water outlet inclined pipe assemblies are arranged on the inner pipe in a staggered mode in the circumferential direction, sliding holes are formed in the outer pipe, the water outlet inclined pipe assemblies slide in the sliding holes, and a cone is arranged at the top of the inner pipe; a bottom plug is arranged on the outer pipe, a water outlet flange pipe is arranged on the lower portion of the bottom plug, a limiting hole is formed in the outer pipe, a spring limiting pin is horizontally arranged in the inner pipe, the spring limiting pin is limited through the limiting hole, and a flange plate is arranged at the bottom of the inner pipe. The technical problems that in the existing equipment cleaning process, a large amount of waste water carrying dirt particles is diffused to the whole heat exchanger system along with fluid in a pipeline, and impurities of the heat exchanger pipeline cannot be really removed are solved, and the device is mainly applied to cleaning of air flue gas preheater pipelines.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cleaning, in particular to an anti-corrosion composite pipe air preheater pipeline cleaning device. Background Art

[0002] During operation, the inner pipe of a flue gas heat exchanger, acting as a channel for flue gas flow, is constantly subjected to complex operating conditions. Flue gas has a complex composition, containing not only acidic gases such as nitrogen oxides and sulfur dioxide, but also fly ash particles, incompletely burned carbon particles, and various corrosive salt crystals. In high temperature and high humidity environments, these impurities gradually deposit on the inner pipe surface, forming a dense and sticky fouling layer. Over time, this deposit creates a vicious cycle: First, the thermal conductivity of the fouling layer is much lower than that of the metal, significantly increasing the thermal resistance of the pipe and reducing the efficiency of heat transfer between the flue gas and the heat exchange medium. Field data shows that when the fouling layer reaches a thickness of 2mm, the heat transfer efficiency can decrease by 15%-20%. Second, the acidic substances in the fouling layer, in combination with water vapor, form an electrolyte solution, accelerating the electrochemical corrosion of the pipe inner wall. This can increase the corrosion rate by 3-5 times, particularly in vulnerable areas such as welds, significantly shortening the designed service life of the equipment.

[0003] Currently, the pipe cleaning technology commonly used in the industry has significant flaws. While traditional high-pressure water jet cleaning can remove some loose impurities, the large amount of wastewater generated during the cleaning process carries dirt particles, which can spread throughout the heat exchanger system along with the fluid inside the pipes. This not only contaminates other uncleaned pipes but can also clog the heat exchanger's fins and channels, causing secondary contamination. Existing devices are unable to fully remove impurities from heat exchanger pipes. Therefore, a new cleaning device was developed that combines efficient cleaning with environmental friendliness and zero secondary contamination. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the above background technology that a large amount of wastewater carrying dirt particles generated during the cleaning process of existing equipment spreads to the entire heat exchanger system along with the fluid inside the pipe, and the impurities in the heat exchanger pipe cannot be truly removed.

[0005] The present invention provides a corrosion-resistant composite tube air preheater pipeline cleaning device, comprising an inner tube, characterized in that an outer tube is arranged outside the inner tube and the inner tube slides in the outer tube, a group of water outlet inclined tube assemblies are circumferentially staggeredly arranged on the inner tube, a sliding hole is arranged on the outer tube, the water outlet inclined tube assembly slides in the sliding hole, a vertebral body is arranged on the top of the inner tube, an umbrella-shaped plug assembly is arranged on the vertebral body, the umbrella-shaped plug assembly is connected to the outer tube by a hinge, a bottom plug is arranged on the outer tube, a water outlet flange tube is arranged at the lower part of the bottom plug, a limiting hole is arranged on the outer tube, a spring limiting pin is horizontally arranged in the inner tube, the spring limiting pin is limited by the limiting hole, and a flange is arranged at the bottom of the inner tube.

[0006] Preferably, the water outlet inclined pipe assembly includes an oblique-mouth pipe and a hose.

[0007] Preferably, the umbrella plug assembly includes ribs, an umbrella canopy, and a movable rod. The umbrella canopy is circumferentially connected to the vertebral body to form an umbrella-shaped circular plug. The umbrella canopy is provided with ribs, and the ribs and the movable rod are connected by hinge 2 to facilitate opening and closing. The umbrella plug assembly is connected to the outer tube via a hinge, and its structural design is reasonable, facilitating the opening and closing action.

[0008] Preferably, a set of anti-slip rings are provided on the outer tube to facilitate hand-holding.

[0009] The present invention has the following advantages:

[0010] Good cleaning effect: A set of water outlet inclined pipe components is circumferentially staggered on the inner pipe. The water outlet inclined pipe components include an oblique-mouth pipe and a hose. The oblique-mouth pipe can spray cleaning media in a directionally. The circumferentially staggered setting can flush the inner wall of the pipe in all directions and without dead angles, and can effectively clean attached impurities, thereby improving the cleaning effect.

[0011] Preventing wastewater contamination: A cone is installed on the top of the inner tube, and an umbrella-shaped plug assembly is installed on the cone. A bottom plug is installed on the outer tube. The umbrella-shaped plug assembly and the bottom plug can form a relatively closed space during the cleaning process, so that the wastewater generated by the cleaning process is concentrated in this space and discharged through the water outlet flange pipe below the bottom plug, preventing wastewater from contaminating the entire heat exchanger pipeline.

[0012] The slag discharge process is excellent: after the final cleaning, the entire device is pulled out from the preheater pipe, and the umbrella-shaped plug assembly scrapes out the impurities on the inner wall of the preheater pipe. It has a reasonable structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A perspective view of the present invention;

[0014] Figure 2 For the present invention Figure 1 A magnified view of point A;

[0015] Figure 3 For the present invention Figure 1 Enlarged view of point B;

[0016] Figure 4 It is a perspective view of the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figures 1 to 4 The present invention provides an anti-corrosion composite pipe air preheater pipeline cleaning device, comprising an inner pipe 1, characterized in that an outer pipe 2 is arranged outside the inner pipe 1 and the inner pipe 1 slides in the outer pipe 2, a group of water outlet inclined pipe components 3 are circumferentially staggered on the inner pipe 1, a sliding hole 20 is provided on the outer pipe 2, and the water outlet inclined pipe component 3 slides in the sliding hole 20, a cone 4 is provided on the top of the inner pipe 1, an umbrella-shaped plug component 5 is provided on the cone 4, and the umbrella-shaped plug component 5 is connected to the outer pipe 2 by a hinge 50, a bottom plug 6 is provided on the outer pipe 2, and a water outlet flange pipe 7 is provided at the lower part of the bottom plug 6, and the bottom plug 6 cooperates with the opened umbrella-shaped plug component 5 to form a closed area to prevent wastewater from overflowing, and the water outlet flange pipe 7 at its lower part is used to discharge clean water. To manage wastewater, a limiting hole 70 is provided on the outer tube 2, and a spring limiting pin 8 is horizontally provided in the inner tube 1. The spring limiting pin 8 is limited by the limiting hole 70, which can accurately limit the sliding position of the inner tube 1 to ensure that each component functions in the appropriate position. A flange 9 is provided at the bottom of the inner tube 1 to facilitate the connection of the inner tube 1 with the external water inlet pipeline. The water outlet inclined pipe assembly 3 includes an oblique pipe 31 and a hose 32. The umbrella-shaped plug assembly 5 includes an umbrella rib 51, an umbrella surface 52 and a movable rod 53. The umbrella surface 52 is circumferentially connected to the vertebral body 4 to form an umbrella-shaped circular ring plug. The umbrella rib 51 is provided on the umbrella surface 52, and the umbrella rib 51 and the movable rod 53 are connected by a hinge 2 54. A group of anti-slip rings 21 are sleeved on the outer tube 2.

[0019] The working principle of the present invention can be found in Figures 1 to 4, by inserting the entire device into the air preheater pipe, the vertebral body 4 is used to break the channel, the staff holds the anti-slip ring 21 in one hand and the inner pipe 1 in the other hand, and the umbrella-shaped plug assembly 5 is supported in the air preheater pipe. A small amount of uncleaned areas on the inner wall of the air preheater pipe at the front end of the umbrella-shaped plug assembly 5 can be ignored. Taking the inner pipe 1 as a reference, the outer pipe 2 is relative to the inner pipe 1, and the outer pipe 2 slides upward. The position of the spring limit pin 8 in the limit hole 70 is adjusted, and the umbrella-shaped plug assembly 5 is opened. At the same time, the water outlet inclined pipe assembly 3 is also stretched from the outer pipe 2. The bottom plug 6 plugs the air preheater pipe, and the water outlet flange pipe 7 is connected to the external water outlet pipe. The flange 9 at the bottom of the inner pipe 1 is installed with the external water inlet pipe. Then pull it back a little to install the device. The umbrella-shaped plug assembly 5 and the water outlet inclined pipe assembly 3 are inserted into the impurities. At this time, the bottom plug 6 has not escaped from the air preheater pipe. During cleaning, water enters the external water inlet pipe and is blocked by the umbrella-shaped plug assembly 5. At the same time, the staggered water outlet inclined pipe assembly 3 can flush the inner wall of the pipe in all directions without dead angles, and can effectively clean the attached impurities. Wastewater and impurities are discharged from the water outlet flange pipe 7. After 30-45 minutes, the staff slowly pulls the entire device to slide the inner pipe 1 in the outer pipe 2 through external drive. During the sliding process of the inner pipe 1, the umbrella-shaped plug assembly 5 can scrape off the soft impurities remaining on the pipe and discharge them from the air preheater pipe to achieve the optimal cleaning state. At the same time, due to the setting of the umbrella-shaped plug assembly 5, wastewater cannot enter other parts of the air preheater, preventing further pollution and improving the cleaning effect.

[0020] The present invention is simple to operate, easy to use, and suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-corrosion composite pipe air preheater pipeline cleaning device, comprising an inner pipe (1), characterized in that: The inner tube (1) is provided with an outer tube (2) and the inner tube (1) slides in the outer tube (2). A group of water outlet inclined tube assemblies (3) are circumferentially staggered on the inner tube (1). A sliding hole (20) is provided on the outer tube (2). The water outlet inclined tube assembly (3) slides in the sliding hole (20). A vertebral body (4) is provided on the top of the inner tube (1). An umbrella-shaped plug assembly (5) is provided on the vertebral body (4). The umbrella-shaped plug assembly (5) is connected to the outer tube (2) through a hinge (50). A bottom plug (6) is provided on the outer tube (2). A water outlet flange pipe (7) is provided at the lower part of the bottom plug (6). A limiting hole (70) is provided on the outer tube (2). A spring limiting pin (8) is horizontally provided in the inner tube (1). The spring limiting pin (8) is limited by the limiting hole (70). A flange plate (9) is provided at the bottom of the inner tube (1).

2. The anti-corrosion composite pipe air preheater pipeline cleaning device according to claim 1, characterized in that: The water outlet inclined pipe assembly (3) comprises an inclined pipe (31) and a hose (32).

3. The anti-corrosion composite pipe air preheater pipeline cleaning device according to claim 1, characterized in that: The umbrella plug assembly (5) comprises an umbrella rib (51), an umbrella surface (52) and a movable rod (53). The umbrella surface (52) is circumferentially connected to the vertebral body (4) to form an umbrella-shaped circular plug. The umbrella rib (51) is arranged on the umbrella surface (52). The umbrella rib (51) and the movable rod (53) are connected via a hinge (54).

4. The anti-corrosion composite pipe air preheater pipeline cleaning device according to claim 1, characterized in that: A set of anti-slip rings (21) are sleeved on the outer tube (2).

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