CN110906355A

CN110906355A - Descaling flue

Info

Publication number: CN110906355A
Application number: CN201911267240.7A
Authority: CN
Inventors: 毛富志; 吴建勇; 杨国英; 吴玉祥
Original assignee: Zhejiang Eco Environmental Technology Co Ltd
Current assignee: Zhejiang Eco Environmental Technology Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-03-24

Abstract

The invention belongs to the technical field of pyrolysis desorption, and particularly relates to a descaling flue. This scale removal flue includes flue body (1), and vertical flue (11) and horizontal flue (12) that communicate each other are drawn together to flue body (1), and vertical flue (11) meet with pyrolysis furnace body (2), set up cooling tube (3) in horizontal flue (12), cooling tube (3) are located the top of vertical flue (11), and cooling tube (3) are driven and are in horizontal flue (12) internal rotation by actuating mechanism (4), and cooling tube (3) are the spiral pipe, and the inner wall of cooling tube (3) and horizontal flue (12) has 5-10 mm's clearance, and the free end of cooling tube (3) is provided with first shower nozzle (5). The descaling flue can reduce the forming probability of smoke scale and prevent the flue from being blocked.

Description

Descaling flue

Technical Field

The invention belongs to the technical field of pyrolysis desorption, and particularly relates to a descaling flue.

Background

In the pyrolysis desorption process, high-temperature flue gas is usually used for heating the pyrolysis desorption furnace, and the flue gas discharged from the pyrolysis desorption furnace is discharged after being treated by processes such as spraying, adsorption and the like through a flue gas pipeline. As shown in fig. 1, the flue gas duct generally comprises a vertical flue 11 and a horizontal flue 12, and in practice, it is found that a large amount of soot is often accumulated at the position shown by the dotted line, thereby causing the flue gas duct to be blocked. The flue gas pipeline is difficult to clean, and effective measures for solving the technical problem are urgently needed in engineering practice.

Chinese patent document CN 205535897U discloses a spray device used in a flue, which uses a plurality of spray pipes interlaced to form a net frame arranged in the flue and erected along the cross section of the flue, each spray pipe is provided with at least one spray head, and the spray areas of each spray head are spliced to form a spray surface capable of at least covering the cross section of the flue. Chinese patent document CN206454489U discloses a flue type slurry spraying system, which comprises a main pipe and a plurality of spraying branch pipes, wherein the plurality of spraying branch pipes are arranged along the extending direction of the main pipe, and each spraying branch pipe respectively penetrates through the outer wall of an air duct and extends into the air duct. It can be seen that the arrangement of the spray header in the flue gas pipeline is a common technical means, which is beneficial to dust fall and temperature reduction of flue gas.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a descaling flue which can reduce the formation probability of smoke scale and prevent the flue from being blocked.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the descaling flue comprises a flue body, wherein the flue body comprises a vertical flue and a transverse flue which are communicated with each other, the vertical flue is connected with the pyrolysis furnace body, a cooling pipe is arranged in the transverse flue and is positioned above the vertical flue, and the cooling pipe is driven by a driving mechanism to rotate in the transverse flue.

The applicant analyzed: the smoke scale can be gathered in a large amount at the position shown in figure 1 of the attached drawings of the specification, because the high-temperature smoke is firstly cooled at the position, and the scouring force of the high-temperature smoke is greatly reduced after the high-temperature smoke is changed from vertical to horizontal. The cooling pipe is arranged above the vertical flue, so that the high-temperature flue gas is moved to the upper part of the vertical flue after meeting a cold area for the first time, and the flue gas is guided to scale at the cooling pipe. The rotation of the cooling pipe is utilized to enable the cooling pipe to be vertically washed by high-temperature flue gas in an all-around manner, so that the flue dust attached to the cooling pipe falls off, and the flue gas is prevented from being blocked by large clusters of flue dust.

As an improvement, the vertical flue is communicated with a material output mechanism of the pyrolysis furnace body. The smoke dust small groups falling from the vertical flue are discharged along with the material output mechanism of the pyrolysis furnace body.

As a refinement, the cooling pipe is a spiral pipe.

As a further improvement, the cooling pipe has a clearance of 5-10mm with the inner wall of the transverse flue. The inner wall of the transverse flue can also generate coking phenomenon, the coking is beneficial to the agglomeration of smoke dust, the outer wall of the cooling pipe is close to the inner wall of the transverse flue, and when the coking on the inner wall of the transverse flue is obvious, the cooling pipe can play a role in scraping.

As a further improvement, the cooling pipe is hollow, a first spray head is arranged at the free end of the cooling pipe, and flushing water or protective gas is sprayed out of the first spray head through the cooling pipe. First shower nozzle is along with the cooling tube rotation, mainly erodees the inner wall of horizontal flue, thereby prevents that the flue gas from forming the coking at the pipe wall and encouraging the flue gas scale deposit.

As a further improvement, a plurality of second spray heads are arranged on the transverse flue, and the second spray heads are transversely arranged along the transverse flue. The second spray head can play a good role in cooling and dust settling, can also replace a conventional spray tower, and plays a role in simplifying the structure of equipment.

In conclusion, the invention solves the scaling problem of the flue gas channel by using a simple structure, has obvious effect through field trial, and does not have the blocking phenomenon of the flue gas channel for more than half a year.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a flue body; 11. a vertical flue; 12. a transverse flue; 2. a pyrolysis furnace body; 3. a cooling tube; 4. a drive mechanism; 5. a first nozzle; 6. and a second spray head.

Detailed Description

Example 1

As shown in figure 1, the descaling flue comprises a flue body 1, wherein the flue body 1 comprises a vertical flue 11 and a transverse flue 12 which are communicated with each other, and the vertical flue 11 is connected with a pyrolysis furnace body 2. In this embodiment, the number of the vertical flues 11 is 2, and each vertical flue 11 corresponds to one pyrolysis furnace body 2. The vertical flue 11 is communicated with a material output mechanism (not shown in the figure) of the pyrolysis furnace body 2, so that the soot lumps or cokes falling from the vertical flue 11 can be discharged along with the material output mechanism conveniently.

A cooling pipe 3 is arranged in the transverse flue 12, the cooling pipe 3 is positioned above the vertical flue 11, and the cooling pipe 3 is driven by the driving mechanism 4 to rotate in the transverse flue 12. The cooling pipe 3 is a spiral pipe which can adopt a packing auger shape or a spring shape, and a gap of 5-10mm is formed between the cooling pipe 3 and the inner wall of the transverse flue 12.

The cooling pipe 3 is hollow, a first nozzle 5 is provided at a free end of the cooling pipe 3, and the flushing water or the shielding gas is ejected from the first nozzle 5 through the cooling pipe 3. Flushing water or protective gas can be selected from two, nitrogen is flushed in the flue, and the explosion-proof effect is achieved.

The transverse flue 12 is provided with a plurality of second spray nozzles 6, and the second spray nozzles 6 are transversely arranged along the transverse flue 12. By adopting the flue gas channel with the structure, a subsequent spray tower can be omitted.

Claims

1. Descaling flue, including flue body (1), vertical flue (11) and horizontal flue (12) including mutual intercommunication of flue body (1), vertical flue (11) meet its characterized in that with pyrolysis furnace body (2): and a cooling pipe (3) is arranged in the transverse flue (12), the cooling pipe (3) is positioned above the vertical flue (11), and the cooling pipe (3) is driven by a driving mechanism (4) to rotate in the transverse flue (12).

2. A flue for descaling as defined in claim 1, wherein: and the vertical flue (11) is communicated with a material output mechanism of the pyrolysis furnace body (2).

3. A flue for descaling as defined in claim 1, wherein: the cooling pipe (3) is a spiral pipe.

4. A flue for descaling as claimed in claim 3, wherein: the cooling pipe (3) and the inner wall of the transverse flue (12) have a clearance of 5-10 mm.

5. A flue for descaling as defined in claim 1, wherein: the cooling pipe (3) is hollow, a first spray head (5) is arranged at the free end of the cooling pipe (3), and flushing water or protective gas is sprayed out of the first spray head (5) through the cooling pipe (3).

6. A flue for descaling as defined in claim 1, wherein: the transverse flue (12) is provided with a plurality of second spray heads (6), and the second spray heads (6) are transversely arranged along the transverse flue (12).