Sulfur dioxide high-temperature flue gas pipeline expansion device

Abstract

The utility model relates to an expansion device for a sulfur dioxide high-temperature flue gas pipeline, which belongs to the technical field of pipeline expansion and comprises a sawtooth expansion joint, a first flange component and a second flange component, the sawtooth expansion joint is provided with an anti-corrosion connecting mechanism, and the anti-corrosion connecting mechanism comprises an anti-corrosion layer fixedly mounted in the sawtooth expansion joint. A connecting inserting cylinder is fixedly installed at one end of the sawtooth expansion joint, a movable inserting cylinder is arranged on the first flange assembly, the connecting inserting cylinder penetrates into the movable inserting cylinder, and the outer portion of the sawtooth expansion joint is in a sawtooth shape. According to the expansion device for the sulfur dioxide high-temperature flue gas pipeline, through the design of the sawtooth-shaped corrugated pipe, a medium flows more smoothly in the corrugated pipe, the residence time of the medium between corrugations is shortened, and under the cooperation of the anti-corrosion layer, corrosive components in the medium can be prevented from corroding the corrugated pipe for a long time; due to the design of the zigzag corrugated pipe, the stress distribution state of the corrugated pipe is changed, and the corrugated pipe is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline expansion technical field, concretely is a kind of sulfur dioxide high-temperature flue gas pipeline expansion device. BACKGROUND

[0002] The complex flue gas generated by oxygen-enriched side-blown furnace has a temperature of 800 DEG C, contains water, sulfur dioxide, fluoride and chloride ions, lead, zinc, silver and other components, and after the flue gas is recovered by waste heat boiler, the temperature of the flue gas is about 350 DEG C, and then the flue gas enters the electric dust collector to collect and capture lead, zinc, silver and other components in the flue gas. The position where the waste heat boiler is connected with the electric dust collector uses a corrugated pipe expansion device to compensate for additional stress caused by temperature difference, and effectively absorbs size changes caused by thermal expansion and contraction by using the expansion and contraction deformation capability of the corrugated pipe expansion device.

[0003] The existing flue gas pipeline expansion device is a 304 stainless steel corrugated pipe expansion joint. Due to the complex composition of flue gas, condensate acid liquid with corrosive property is formed during the start-up and shutdown process, and the condensate acid liquid is accumulated in the lower groove of the corrugated pipe, which corrodes the expansion joint. In addition, the expansion joint is subjected to tensile type deformation due to thermal expansion and contraction, and the corrugated pipe expansion joint is prone to perforation and damage, which leads to insufficient furnace negative pressure, flue gas leakage, and the need to stop production for treatment, resulting in high maintenance frequency and seriously affecting the production operation efficiency. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the utility model provides a sulfur dioxide high-temperature flue gas pipeline expansion device, which has the advantages of not being easy to leave residual medium and damage, and solves the problems of the existing stainless steel corrugated pipe expansion joint, the formation of condensate acid liquid with corrosive property during the start-up and shutdown process, the accumulation of the condensate acid liquid in the lower groove of the corrugated pipe, the corrosion of the expansion joint, and the perforation and damage of the corrugated pipe expansion joint.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a sulfur dioxide high-temperature flue gas pipeline expansion device, comprising a zigzag expansion joint, a first flange assembly and a second flange assembly, and a corrosion-resistant connecting mechanism is arranged on the zigzag expansion joint.

[0006] The corrosion-resistant connecting mechanism comprises a corrosion-resistant layer fixedly installed in the zigzag expansion joint, a connecting plug is fixedly installed at one end of the zigzag expansion joint, an active plug-in barrel is arranged on the first flange assembly, the connecting plug penetrates into the active plug-in barrel, and the zigzag expansion joint has a zigzag shape.

[0007] Further, the first flange assembly comprises a first flange plate, a first asbestos pad and a second flange plate, the first flange plate, the first asbestos pad and the second flange plate are sequentially stacked from bottom to top, the active plug-in barrel is fixedly installed on the surface of the first flange plate, and a first connecting assembly is arranged between the first flange plate, the first asbestos pad and the second flange plate.

[0008] Further, the first connecting assembly comprises first bolt holes formed on surfaces of the first flange plate, the first asbestos pad and the second flange plate, the first bolt holes on the first flange plate, the first asbestos pad and the second flange plate correspond to each other and are communicated, and first bolts are fixedly installed in the first bolt holes.

[0009] Further, the first bolt holes and the first bolts are multiple, and the multiple first bolt holes and the first bolts are uniformly distributed on surfaces of the first flange plate, the first asbestos pad and the second flange plate.

[0010] Further, the second flange assembly comprises a third flange plate, a second asbestos pad and a fourth flange plate, the third flange plate is fixedly installed at one end of the zigzag expansion joint away from the connecting spigot, and the second connecting assembly is arranged between the third flange plate, the second asbestos pad and the fourth flange plate.

[0011] Further, the second connecting assembly comprises second bolt holes formed on surfaces of the third flange plate, the second asbestos pad and the fourth flange plate, the second bolt holes on the third flange plate, the second asbestos pad and the fourth flange plate correspond to each other and are communicated, and second bolts are fixedly installed in the second bolt holes.

[0012] Further, the second bolt holes and the second bolts are multiple, and the multiple second bolt holes and the second bolts are uniformly distributed on surfaces of the third flange plate, the second asbestos pad and the fourth flange plate.

[0013] Further, the connecting spigot is fixedly installed with two limiting rings, the two limiting rings are respectively located on the inner side and the outer side of the movable spigot, and the connecting spigot and the movable spigot are in sliding contact.

[0014] Compared with the prior art, the technical scheme has the following beneficial effects:

[0015] The sulfur dioxide high-temperature flue gas pipeline expansion device, through the design of the zigzag corrugated pipe, makes the flow of the medium in the corrugated pipe more smooth, reduces the residence time of the medium between the corrugations, and cooperates with the anticorrosion layer to help prevent the corrosive components in the medium from eroding the corrugated pipe for a long time. The design of the zigzag corrugated pipe changes the stress distribution state of the corrugated pipe, making it more uniform. This uniform stress distribution helps to reduce stress concentration and improve the fatigue resistance of the expansion joint, thereby prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a whole structure schematic view of the utility model;

[0017] Fig. 2The utility model discloses an active plug-in barrel structure schematic diagram;

[0018] Fig. 3 The utility model discloses a connecting plug-in barrel structure schematic diagram;

[0019] Fig. 4 The utility model discloses a first flange, first asbestos pad and second flange connecting structure schematic diagram;

[0020] Fig. 5 The utility model discloses a third flange, second asbestos pad and fourth flange connecting structure schematic diagram.

[0021] In the drawing: 1, zigzag expansion joint;2, anticorrosion layer;3, connecting plug-in barrel;4, active plug-in barrel;5, first flange;6, first asbestos pad;7, second flange;8, first bolt hole;9, first bolt;10, third flange;11, second asbestos pad;12, fourth flange;13, second bolt hole;14, second bolt;15, limiting ring. Specific implementation

[0022] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the range of the utility model protection.

[0023] Please refer to Figs. 1 to 5 The utility model discloses a kind of zigzag expansion joint 1, first flange assembly and second flange assembly, zigzag expansion joint 1 is equipped with anticorrosion connecting mechanism, anticorrosion connecting mechanism includes the anticorrosion layer 2 of fixed installation in zigzag expansion joint 1 interior, zigzag expansion joint 1 one end is fixedly installed with connecting plug-in barrel 3, first flange assembly is equipped with active plug-in barrel 4, connecting plug-in barrel 3 is penetrated into active plug-in barrel 4, the external shape of zigzag expansion joint 1 is zigzag, connecting plug-in barrel 3 surface is fixedly installed with the limiting ring 15 of two numbers, two limiting rings 15 are located respectively inside and outside of active plug-in barrel 4, sliding contact between connecting plug-in barrel 3 and active plug-in barrel 4.

[0024] First flange assembly includes first flange 5, first asbestos pad 6 and second flange 7, first flange 5, first asbestos pad 6 and second flange 7 are sequentially stacked from bottom to top, active plug-in barrel 4 is fixedly installed on the surface of first flange 5.

[0025] The first connecting assembly is arranged between the first flange plate 5, the first asbestos pad 6 and the second flange plate 7, and comprises first bolt holes 8 formed on surfaces of the first flange plate 5, the first asbestos pad 6 and the second flange plate 7, the first bolt holes 8 on the first flange plate 5, the first asbestos pad 6 and the second flange plate 7 correspond to and communicate with each other, and first bolts 9 are fixedly installed in the first bolt holes 8, the number of the first bolt holes 8 and the first bolts 9 is multiple, and the multiple first bolt holes 8 and the first bolts 9 are uniformly distributed on the surfaces of the first flange plate 5, the first asbestos pad 6 and the second flange plate 7.

[0026] The second flange assembly comprises a third flange plate 10, a second asbestos pad 11 and a fourth flange plate 12, the third flange plate 10, the second asbestos pad 11 and the fourth flange plate 12 are sequentially stacked from top to bottom, and the third flange plate 10 is fixedly installed at one end of the zigzag expansion joint 1 away from the connecting plug 3.

[0027] The second connecting assembly is arranged between the third flange plate 10, the second asbestos pad 11 and the fourth flange plate 12, and comprises second bolt holes 13 formed on surfaces of the third flange plate 10, the second asbestos pad 11 and the fourth flange plate 12, the second bolt holes 13 on the third flange plate 10, the second asbestos pad 11 and the fourth flange plate 12 correspond to and communicate with each other, and second bolts 14 are fixedly installed in the second bolt holes 13, the number of the second bolt holes 13 and the second bolts 14 is multiple, and the multiple second bolt holes 13 and the second bolts 14 are uniformly distributed on the surfaces of the third flange plate 10, the second asbestos pad 11 and the fourth flange plate 12.

[0028] It should be noted that the zigzag expansion joint 1 in the embodiment is made of 316 stainless steel.

[0029] It should be noted that the corrosion-resistant layer 2 in the embodiment is made of KNM1000 anti-corrosion ceramic paint, the KNM1000 anti-corrosion ceramic paint contains special ceramic particles, has chemical stability, can resist the corrosion of sulfur dioxide and acidic substances generated therefrom under certain conditions, and after being coated on the surface of the zigzag expansion joint and solidified, a dense and uniform protective coating is formed, which greatly reduces the probability of corrosion.

[0030] The working principle of the above embodiment is as follows:

[0031] The external shape of the zigzag expansion joint 1 is zigzag, which can adapt to the expansion and contraction of the high-temperature flue gas pipeline due to temperature changes and prevent the residue of condensed acid liquid, the anticorrosion layer 2 is fixedly installed inside the zigzag expansion joint 1, which effectively prevents the corrosive substances in the high-temperature flue gas from damaging the expansion joint and prolongs the service life thereof, the connecting plug 3 is fixedly installed at one end of the zigzag expansion joint 1, which is used for connecting with the movable plug-in sleeve 4 of the first flange assembly, realizing the stable connection between the expansion joint and the flange assembly, the movable plug-in sleeve 4 is fixedly installed on the surface of the first flange plate 5 and cooperates with the connecting plug 3 of the zigzag expansion joint 1, realizing the sliding connection between the expansion joint and the first flange assembly, allowing the expansion joint to freely stretch and shrink in the axial direction while maintaining the stable connection with the flange assembly, the third flange plate 10 is fixedly installed at the end of the zigzag expansion joint 1 away from the connecting plug 3 and forms an integral structure with the zigzag expansion joint 1, which jointly bears the pressure and action of the high-temperature flue gas, the relative sliding range between the connecting plug 3 and the movable plug-in sleeve 4 is limited by the design of the limiting ring 15, which ensures that the expansion joint will not be separated from the flange assembly during the stretching and shrinking process, and the stability and safety of the device are ensured.

[0032] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that for the purpose of the present application, the embodiments change, modify, replace, and vary in many ways without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-temperature flue gas pipeline expansion device for sulfur dioxide, comprising a zigzag expansion joint (1), a first flange assembly and a second flange assembly, characterized in that: The sawtooth expansion joint (1) is provided with an anti-corrosion connecting mechanism; The anti-corrosion connecting mechanism comprises an anti-corrosion layer (2) fixedly installed in the sawtooth expansion joint (1), and a connecting plug (3) fixedly installed at one end of the sawtooth expansion joint (1); the first flange assembly is provided with a movable plug-in sleeve (4), and the connecting plug (3) penetrates into the movable plug-in sleeve (4); and the sawtooth expansion joint (1) has a sawtooth shape in outer shape.

2. A sulphur dioxide high temperature flue gas pipeline expansion device according to claim 1, characterised in that: The first flange assembly comprises a first flange plate (5), a first asbestos pad (6) and a second flange plate (7), which are stacked from bottom to top; the movable plug-in sleeve (4) is fixedly installed on the surface of the first flange plate (5); and the first flange plate (5), the first asbestos pad (6) and the second flange plate (7) are provided with a first connecting assembly.

3. A sulphur dioxide high temperature flue gas pipeline expansion device according to claim 2, characterised in that: The first connecting assembly comprises first bolt holes (8) formed on the surfaces of the first flange plate (5), the first asbestos pad (6) and the second flange plate (7); the first bolt holes (8) on the first flange plate (5), the first asbestos pad (6) and the second flange plate (7) correspond to and communicate with each other; and first bolts (9) are fixedly installed in the first bolt holes (8).

4. A sulphur dioxide high temperature flue gas pipeline expansion device according to claim 3, characterised in that: The number of the first bolt holes (8) and the first bolts (9) is multiple, and the multiple first bolt holes (8) and the multiple first bolts (9) are uniformly distributed on the surfaces of the first flange plate (5), the first asbestos pad (6) and the second flange plate (7).

5. A sulfur dioxide high temperature flue gas pipeline expansion device according to claim 1, wherein: The second flange assembly comprises a third flange plate (10), a second asbestos pad (11) and a fourth flange plate (12), which are stacked from top to bottom; the third flange plate (10) is fixedly installed at the end of the sawtooth expansion joint (1) away from the connecting plug (3); and the third flange plate (10), the second asbestos pad (11) and the fourth flange plate (12) are provided with a second connecting assembly.

6. A sulphur dioxide high temperature flue gas pipeline expansion device according to claim 5, characterised in that: The second connecting assembly comprises second bolt holes (13) formed on the surfaces of the third flange plate (10), the second asbestos pad (11) and the fourth flange plate (12); the second bolt holes (13) on the third flange plate (10), the second asbestos pad (11) and the fourth flange plate (12) correspond to and communicate with each other; and second bolts (14) are fixedly installed in the second bolt holes (13).

7. A sulphur dioxide high temperature flue gas pipeline expansion device according to claim 6, characterised in that: The number of the second bolt holes (13) and the second bolts (14) is multiple, and the multiple second bolt holes (13) and the multiple second bolts (14) are uniformly distributed on the surfaces of the third flange plate (10), the second asbestos pad (11) and the fourth flange plate (12).

8. A sulfur dioxide high temperature flue gas pipeline expansion device according to claim 1, wherein: The connecting plug (3) is fixedly installed with two limiting rings (15) on the surface, and the two limiting rings (15) are respectively located on the inner side and the outer side of the movable plug-in sleeve (4); and the connecting plug (3) and the movable plug-in sleeve (4) are in sliding contact.

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