Descaling flue

Abstract

The present invention belongs to the technical field of thermal desorption, and particularly relates to a scale-removing flue. The scale-removing flue includes a flue body (1), and the flue body (1) includes a vertical flue (11) and a horizontal flue (12) that are connected to each other. The vertical flue (11) is connected to a pyrolysis furnace body (2). A cooling pipe (3) is arranged in the horizontal flue (12). The cooling pipe (3) is located above the vertical flue (11). The cooling pipe (3) is driven by a driving mechanism (4) to rotate in the horizontal flue (12). The cooling pipe (3) is a spiral pipe. There is a gap of 5-10 mm between the cooling pipe (3) and the inner wall of the horizontal flue (12). A first spray head (5) is arranged at the free end of the cooling pipe (3). This scale-removing flue can reduce the formation probability of soot and prevent the flue from being blocked.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal desorption, and in particular relates to a descaling flue. Background Art

[0002] In the pyrolysis desorption process, high-temperature flue gas is often used to heat the pyrolysis desorption furnace. The flue gas from the pyrolysis desorption furnace is discharged through the flue gas pipeline after being treated by spraying, adsorption and other processes. Figure 1 As shown, the flue gas duct generally includes a vertical flue 11 and a horizontal flue 12. In practice, it is found that a large amount of soot is often accumulated at the position shown by the dotted line, which leads to blockage of the flue gas duct. The flue gas duct is difficult to clean, and effective measures to solve this technical problem are urgently needed in engineering practice.

[0003] Chinese patent document CN 205535897U discloses a spray device for flue, which uses a plurality of spray pipes interwoven to form a mesh frame for being arranged along the cross section of the flue and arranged in the flue, each spray pipe is provided with at least one nozzle, and the spray area of ​​each nozzle is combined to form a spray surface that can at least cover the cross section of the flue. Chinese patent document CN206454489U discloses a flue-type slurry spray system, which includes a main pipeline and a plurality of spray branches, and a plurality of spray branches are arranged along the extension direction of the main pipeline, and each spray branch passes through the outer wall of the air duct and extends into the interior of the air duct. It can be seen that setting a spray head in the flue gas duct is a commonly used technical means, which is conducive to dust reduction and cooling of the flue gas. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a descaling flue which can reduce the probability of formation of soot and prevent the flue from being blocked.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The descaling flue comprises a flue body, which comprises a vertical flue and a transverse flue that are interconnected. The vertical flue is connected to the pyrolysis furnace body. A cooling pipe is arranged in the transverse flue. The cooling pipe is located above the vertical flue and is driven by a driving mechanism to rotate in the transverse flue.

[0007] Applicant's analysis: Soot will be on the drawings in the specification. Figure 1 The large amount of accumulation at the position shown is due to the fact that the high-temperature flue gas is cooled for the first time at this location, and the scouring force of the high-temperature flue gas is greatly reduced after it turns from vertical to horizontal. The applicant sets a cooling pipe above the vertical flue, so that the first cooling area of ​​the high-temperature flue gas moves to the top of the vertical flue, guiding the flue gas to scale at the cooling pipe. The cooling pipe itself rotates so that it can be vertically scoured by the high-temperature flue gas in all directions, so that the smoke and dust attached to the cooling pipe fall off, preventing the smoke and dust from forming large clumps and blocking the flue.

[0008] As an improvement, the vertical flue is communicated with the material output mechanism of the pyrolysis furnace body. The small soot clusters falling from the vertical flue are discharged along with the material output mechanism of the pyrolysis furnace body.

[0009] As an improvement, the cooling pipe is a spiral pipe.

[0010] As a further improvement, there is a gap of 5 - 10 mm between the cooling pipe and the inner wall of the horizontal flue. Coking also occurs on the inner wall of the horizontal flue. Coking is beneficial to the formation of soot clusters. The outer wall of the cooling pipe is close to the inner wall of the horizontal flue. When obvious coking occurs on the inner wall of the horizontal flue, the cooling pipe can play a scraping role.

[0011] As a further improvement, the cooling pipe is hollow, and a first spray head is arranged at the free end of the cooling pipe. Flushing water or protective gas is sprayed out from the first spray head through the cooling pipe. The first spray head rotates along with the cooling pipe, mainly flushing the inner wall of the horizontal flue to prevent coking of the flue gas on the pipe wall, thus preventing the growth of flue gas scaling.

[0012] As a further improvement, a number of second spray heads are arranged on the horizontal flue, and the second spray heads are arranged horizontally along the horizontal flue. The second spray heads can play a good role in cooling and dust reduction, and can also replace the conventional spray tower, playing a role in streamlining the equipment structure.

[0013] In summary, the present invention solves the problem of scaling in the flue gas passage with a simple structure. The on-site trial shows obvious effects. No blockage has occurred in the flue gas passage for more than half a year of use. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present invention.

[0015] In the figure: 1, flue duct body; 11, vertical flue; 12, horizontal flue; 2, pyrolysis furnace body; 3, cooling pipe; 4, driving mechanism; 5, first spray head; 6, second spray head. Detailed Description of the Invention

[0016] Embodiment 1

[0017] As Figure 1 shown, the descaling flue of the present invention includes a flue duct body 1. The flue duct body 1 includes a vertical flue 11 and a horizontal flue 12 that are communicated with each other. The vertical flue 11 is connected to the pyrolysis furnace body 2. In this embodiment, the number of vertical flues 11 is 2, and each vertical flue 11 corresponds to a pyrolysis furnace body 2. The vertical flue 11 is communicated with the material output mechanism (not shown in the figure) of the pyrolysis furnace body 2, facilitating the discharge of the soot clusters or coking substances falling from the vertical flue 11 along with the material output mechanism.

[0018] A cooling pipe 3 is arranged in the horizontal flue 12. The cooling pipe 3 is located above the vertical flue 11 and is driven by a driving mechanism 4 to rotate in the horizontal flue 12. The cooling pipe 3 is a spiral pipe, which can be in the shape of an auger or a spring. There is a gap of 5-10 mm between the cooling pipe 3 and the inner wall of the horizontal flue 12.

[0019] The cooling pipe 3 is hollow, and a first spray head 5 is arranged at the free end of the cooling pipe 3. Flushing water or protective gas is sprayed out from the first spray head 5 through the cooling pipe 3. Flushing water or protective gas can be selected one of the two. Nitrogen is flushed in the flue to play an explosion-proof role.

[0020] A number of second spray heads 6 are arranged on the horizontal flue 12, and the second spray heads 6 are arranged horizontally along the horizontal flue 12. With the flue gas passage adopting this structure, the subsequent spray tower can be omitted.

Claims

1. The descaling flue duct includes a flue duct body (1), and the flue duct body (1) includes a vertical flue duct (11) and a horizontal flue duct (12) that are interconnected. The vertical flue duct (11) is connected to the pyrolysis furnace body (2). It is characterized in that: A hollow cooling pipe (3) is arranged in the horizontal flue duct (12). The cooling pipe (3) is located above the vertical flue duct (11), so that the high-temperature flue gas derived from the pyrolysis furnace body (2) is cooled and scaled at the cooling pipe (3); the flue gas cooling pipe (3) is driven by a driving mechanism (4) to rotate in the horizontal flue duct (12), so that the cooling pipe (3) can be vertically scoured by the high-temperature flue gas in all directions to utilize the dust attached to the cooling pipe to fall off.

2. The descaling flue duct according to claim 1, It is characterized in that: The vertical flue duct (11) is communicated with the material output mechanism of the pyrolysis furnace body (2).

3. The descaling flue duct according to claim 1, It is characterized in that: The cooling pipe (3) is a spiral pipe.

4. The descaling flue duct according to claim 3, It is characterized in that: There is a gap of 5-10 mm between the cooling pipe (3) and the inner wall of the horizontal flue duct (12).

5. The descaling flue duct according to claim 1, It is characterized in that: The cooling pipe (3) is hollow, and a first nozzle (5) is arranged at the free end of the cooling pipe (3). Flushing water or protective gas is sprayed out from the first nozzle (5) through the cooling pipe (3).

6. The descaling flue duct according to claim 1, It is characterized in that: A number of second nozzles (6) are arranged on the horizontal flue duct (12), and the second nozzles (6) are arranged horizontally along the horizontal flue duct (12).

Images