CN209782686U - Anticorrosive wear-resisting quarter turn desulfurization flue - Google Patents

Abstract

The utility model discloses an anticorrosive wear-resisting quarter turn desulfurization flue belongs to sweetener connecting tube technical field. The desulfurization flue mainly comprises an expanding section, a first turning section, a straight section and a second turning section which are sequentially connected with an integrally formed pipeline mechanism; the inlet end face of the diameter expanding section is perpendicular to the outlet end face of the second turning section; the gas flow cross-sectional area of the diameter expanding section is gradually increased from the inlet to the outlet; inside from inside to outside being equipped with tie coat, structural layer and wearing layer in proper order of desulfurization pipeline. The diameter expanding section is arranged at the inlet end of the corrosive gas, so that the flow velocity of the corrosive gas is reduced, and the abrasion of the desulfurization pipeline caused by flue gas impact when the corrosive gas enters the pipeline is weakened. The diameter expanding section is followed by the first turning section to promote the direction change of the corrosive gas. The first turning section is followed by a straight section, so that turbulence impact caused by flue gas turning is stabilized, and finally, the right-angle turning of flue gas is realized through the second turning section.

Description

Anticorrosive wear-resisting quarter turn desulfurization flue

Technical Field

The utility model relates to an anticorrosive wear-resisting quarter turn desulfurization flue belongs to sweetener connecting tube technical field.

Background

The coal-fired boiler can produce a large amount of flue gas in the combustion process, and the flue gas contains harmful components such as nitrogen, sulfur and the like produced in the combustion process. Before the flue gas is discharged, the flue gas must be subjected to desulfurization and denitration treatment so as to reduce the content of harmful components of nitrogen and sulfur. Before and after desulfurization, harmful flue gas can be subjected to three stages of original flue gas before desulfurization, desulfurization in a desulfurization absorption tower and clean flue gas after desulfurization. The main wear and corrosion of the raw flue gas flow through the raw flue comes from two aspects: namely acid liquor corrosion formed by sulfide in the smoke when meeting water and abrasion corrosion of particles to the inner wall of the flue. And in the stage of purifying the flue gas, the desulfurized flue gas is discharged into a chimney through a purified flue gas channel and enters the atmosphere for emission. The clean flue corrosive wear mainly comes from the wear of flue particles, and meanwhile, residual sulfur in the flue gas can also form acid liquor to corrode the flue to a certain extent.

Harmful flue gas is required to be conveyed to the next process link for treatment after being generated and treated, and a desulfurization flue is required to be used as a main carrier of the harmful flue gas in the flue gas conveying process. In the process of conveying harmful flue gas, the diversion of the desulfurization flue is a frequently encountered condition. The diversion phase of the sulfur-containing gas during the transportation process can cause great wear and corrosion to the transportation pipeline, especially the diversion of the pipeline at a large angle.

For how to reduce the problem of the corrosion and the abrasion to the flue in the turning process of the desulfurization flue, the main concern at present is to add an anticorrosion and wear-resistant structure such as an anticorrosion and wear-resistant layer in the pipeline. For example, the traditional flue corrosion-resistant structure generally adopts a corrosion-resistant alloy structure such as glass flakes, lining rubber and titanium plates. This structure has the following problems:

Firstly, when the glass flake encounters high temperature, the coating of the glass flake can be damaged, and styrene, organic resin and the like sealed in the coating burn after contacting with air, so that the fire risk is large. The resin can not realize large-amplitude temperature resistance promotion, and because the structure is complicated, the coating effect is difficult to ensure in the process of pasting and brushing, and leakage points are easy to appear.

Secondly, the lining rubber structure is usually distributed in the flue by a single-layer butyl rubber plate in a blocking and sticking mode. The processing mode has more seams, the seam position is easy to crack, and the hollowing problem caused by the untight sealing of the seam is easy to occur in the operation process. The curing process needs a long time after the rubber lining structure is pasted, and the time consumption of the maintenance process is long.

SUMMERY OF THE UTILITY MODEL

For solving current desulfurization flue easy in the turn in-process be by the sulfur waste gas corrosive wear that contains, the interior thermal behavior that current anticorrosive wear-resisting processing mode exists is poor, and sealed effect is poor, long technical problem of maintenance time, the utility model provides an anticorrosive wear-resisting quarter turn desulfurization flue, the technical scheme who takes as follows:

An anticorrosive wear-resistant quarter turn desulfurization flue mainly comprises a diameter-expanding section 1, a first turning section 2, a straight section 3 and a second turning section 4 which are sequentially connected with an integrally formed pipeline mechanism; the inlet end face of the diameter expanding section 1 is vertical to the outlet end face of the second turning section 4; the gas flow cross-sectional area of the diameter expanding section 1 is gradually increased from the inlet to the outlet; inside from inside to outside being equipped with tie coat 6, structural layer 7 and wearing layer 8 in proper order of desulfurization pipeline.

preferably, the turning angle of the first turning section 2 and the second turning section 4 is 45 degrees.

Preferably, the thickness of the bonding layer 6 is 0.2-1.0 mm; the thickness of the structural layer 7 is 1.0-2.5 mm; the thickness of the silicon carbide wear-resistant layer 8 is 0.2-1.0 mm.

More preferably, the thickness of the adhesive layer 6 is 0.5 mm; the thickness of the structural layer 7 is 1.5-2.0 mm; the thickness of the silicon carbide wear-resistant layer 8 is 0.5 mm.

Preferably, the length of the straight section 3 is 1 to 2 times of the difference between the inside and outside turning radii of the turning section.

Preferably, the cross section of the desulfurization pipeline is circular, rectangular or rounded rectangular.

Preferably, the material of the adhesive layer 6 is epoxy resin; the material of the structural layer 7 is a silicon carbide composite material with the curing hardness of 2H; the wear-resistant layer 8 is made of a silicon carbide composite material with the curing hardness of 4H.

Preferably, the front end of the expanding section 1 is provided with a wind direction adjusting device. Specifically, the wind direction adjusting device is an electric damper, and the existing products, such as the electric damper manufactured by Jiangsu Juzheng mechanical Co., Ltd, can be used for the damper. The wind direction adjusting device can adjust the circulation and the entering angle of the flue gas entering the desulfurization flue so as to further reduce the erosion and wear of the flue gas to the flue.

Compared with the prior art, the utility model discloses the beneficial effect who obtains:

The diameter expanding section is arranged at the inlet end of the corrosive gas, so that the flow section of the corrosive gas entering the desulfurization pipeline is enlarged, the flow velocity of the corrosive gas is reduced, and the abrasion of the desulfurization pipeline caused by flue gas impact when the corrosive gas enters the pipeline is weakened. The diameter expanding section is followed by the first turning section to promote the direction change of the corrosive gas. The first turning section is followed by a straight section, so that turbulence impact caused by flue gas turning is stabilized, and finally, the right-angle turning of flue gas is realized through the second turning section. The structure of the desulfurization flue can effectively weaken the impact abrasion and acid gas corrosion of corrosive gas to the desulfurization flue in the process of turning right angles.

Meanwhile, the interior of the desulfurization pipeline is provided with a bonding layer, a structural layer and a silicon carbide wear-resistant layer which are arranged in a spraying or smearing manner. The uniformity is good after the arrangement, and the problems of leakage points and hollowing caused by more gaps in the traditional pasting can be effectively avoided. And, since the three-layer structure is integral

Drawings

Fig. 1 is a schematic structural view of an anti-corrosion wear-resistant quarter turn desulfurization flue in an optimal mode.

3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3

Fig. 3 is a partially enlarged view of fig. 2.

In the figure: 1, expanding the diameter; 2, a first turning section; 3, a straight section; 4, a second turning section; 5, a pipe section body; 6, a bonding layer; 7, a structural layer; 8, a wear-resistant layer.

Detailed Description

The materials, methods and apparatus used in the following examples, which are not specifically illustrated, are conventional in the art and are commercially available to those of ordinary skill in the art.

In the following description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and "upright" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

in the following description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, or the connection may be internal to both components. To those of ordinary skill in the art, the specific meaning of the written terms in the present invention can be understood as a specific case.

In addition, in the following description of the present invention, the meaning of "a plurality", and "a plurality" is two or more unless otherwise specified.

The silicon carbide composite materials used for the structural layers and the wear-resistant layers in the following examples were purchased from silicon carbide wear-resistant and corrosion-resistant coating adhesives of Wuhan Kormancki wear-resistant materials Co., Ltd., product number DZ 7051. The curing strength of the material can be adjusted by those skilled in the art according to actual needs.

The present invention will be described in further detail with reference to the accompanying drawings, but the following detailed description is not to be construed as limiting the present invention.

Fig. 1 is a schematic structural view of an anti-corrosion wear-resistant right-angle joint turning desulfurization flue in an optimal mode. 3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3 Fig. 3 is a partially enlarged view of fig. 2. As can be seen from fig. 1 to 3, the quarter turn desulfurization flue is an integrated structure and is divided into an expanding section 1, a first turning section 2, a straight section 3 and a second turning section 4. Acid gas enters the desulfurization pipeline from the diameter expanding section 1, and is discharged after sequentially passing through the first turning section 2, the straight section 3 and the second turning section 4, so that the turning of the acid gas is realized. The smoke flow cross-sectional area of the diameter expanding section 1 is gradually increased from the inlet section to the outlet section. The downstream section of the diameter expanding section 1 is a first turning section 2 with a turning angle of 45 degrees, the downstream section of the first turning section 2 is a straight section 3, and the downstream section of the straight section 3 is a second turning section 4 with a turning angle of 45 degrees. Wherein, the length of the straight section 1 is 1.8 times of the difference of the bending radiuses of the inner side and the outer side of the bending of the turning section. According to the arrangement mode, after corrosive flue gas is output from the part of the absorption tower, the flow area is increased through the diameter expanding section 1 to reduce the gas flow speed, and then the corrosive flue gas is turned for the first time through the first turning section 2 and enters the straight section 3. The gas turbulence generated by the first turning section 2 is buffered at the straight section 3 and then passes through the second turning section 4 to complete the second turning, so that the right-angle turning of the flue is realized. The whole turning process of the flue gas is gentle, so that the impact abrasion and corrosion of the flue gas to the desulfurization flue are reduced.

Meanwhile, the inner side surface of the pipe is sequentially provided with a bonding layer 6, a structural layer 7 and a wear-resistant layer 8 from inside to outside. Wherein, tie coat 6 is 0.5 mm's epoxy, and the structural layer in middle part is the wear-resisting anticorrosive coating of carborundum glue of 1.8mm thick, and the wear-resisting anticorrosive coating of carborundum glue of 0.5mm is glued to the outermost side wear layer. The curing hardness of the silicon carbide wear-resistant and anti-corrosion coating adhesive of the structural layer is 2H, and the curing hardness of the silicon carbide wear-resistant and anti-corrosion coating adhesive of the wear-resistant layer is 4H.

The bonding layer 8, the structural layer 7 and the wear-resistant layer 8 on the inner side of the desulfurization pipeline can be formed by liquid solidification in a smearing or spraying mode. Above-mentioned wear-resisting anticorrosive coating structure of three laminar can realize having the inner wall that the leak source covers the desulfurization pipeline completely, effectively avoids the appearance of hollowing problem.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (8)

1. An anticorrosive wear-resistant quarter turn desulfurization flue is characterized in that an expanding section (1), a first turning section (2), a straight section (3) and a second turning section (4) are sequentially connected with an integrally formed pipeline mechanism; the inlet end face of the diameter expanding section (1) is vertical to the outlet end face of the second turning section (4); the gas flow cross-sectional area of the expanding section (1) is gradually increased from the inlet to the outlet; the inside tie coat (6), structural layer (7) and wearing layer (8) of being equipped with in proper order from inside to outside of desulfurization pipeline.

2. The flue for desulfurization of claim 1, characterized in that the turning angle of the first turning section (2) and the second turning section (4) is 45 degrees.

3. The corrosion-resistant and wear-resistant quarter turn desulfurization flue according to claim 1, wherein the thickness of the bonding layer (6) is 0.2-1.0 mm; the thickness of the structural layer (7) is 1.0-2.5 mm; the thickness of the wear-resistant layer (8) is 0.2-1.0 mm.

4. An anticorrosive wear-resistant quarter turn desulfurization flue according to claim 3, characterized in that the thickness of the bonding layer (6) is 0.5 mm; the thickness of the structural layer (7) is 1.5-2.0 mm; the thickness of the wear-resistant layer (8) is 0.5 mm.

5. the corrosion-resistant and wear-resistant quarter turn desulfurization flue according to claim 1, characterized in that the length of the straight section (3) is 1-2 times of the difference between the inside and outside turning radii of the turn section.

6. The corrosion-resistant and wear-resistant quarter turn desulfurization flue according to claim 1, wherein the section of the desulfurization pipeline is circular, rectangular or rounded rectangular.

7. The corrosion-resistant and wear-resistant quarter turn desulfurization flue according to claim 1, characterized in that the material of the bonding layer (6) is epoxy resin; the structural layer (7) is made of a silicon carbide composite material with the curing hardness of 2H; the wear-resistant layer (8) is made of a silicon carbide composite material with the curing hardness of 4H.

8. The corrosion-resistant and wear-resistant quarter turn desulfurization flue according to claim 1, characterized in that an air inlet and direction adjusting device is arranged at the front end of the diameter expanding section (1).