CN110921332A

CN110921332A - Powder conveying channel connecting structure and method

Info

Publication number: CN110921332A
Application number: CN201911299249.6A
Authority: CN
Inventors: 黄勇; 王武生; 张月明; 杨会民; 刘巧霞; 王研; 靳皎; 郝婷; 王蒙
Original assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Current assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-03-27
Anticipated expiration: 2039-12-17
Also published as: CN110921332B

Abstract

The invention discloses a powder conveying channel connecting structure and a method, wherein the connecting structure comprises an inner cylinder, an outer cylinder, an inner cylinder anti-abrasion block and an inner cylinder bearing ring, the connection of two sections of lined pipes is realized by arranging the inner and outer cylinders which are mutually sleeved between an upper section of lined pipe to be connected and a lower section of lined pipe to be connected, a radial expansion gap is reserved between the inner and outer cylinders and the lined pipes, an expansion gap is reserved between the ends of the two sections of lined pipes, the problem that the lined pipes are extruded and damaged due to expansion elongation and radial expansion of the lined pipes is avoided, the inner cylinder anti-abrasion block is arranged at the expansion gap between the ends of the two sections of lined pipes, and the erosion abrasion of conveying powder to the reserved expansion gap is avoided; when the inner and outer cylinder sleeve structure is installed, a proper amount of conveyed powder is filled into an annular gap formed by the outer cylinder and the lower section lining pipe, the inner cylinder plays a role in plugging the gap after being inserted into the outer cylinder, the risk of leakage of the powder from an expansion gap and the expansion gap is avoided, and reliable and efficient connection of channels is realized.

Description

Powder conveying channel connecting structure and method

Technical Field

The invention relates to the field of powder engineering, relates to a powder pneumatic conveying device, and particularly relates to a powder conveying channel connecting structure and a powder conveying channel connecting method.

Background

Thermal stress and wear problems are widely present in the engineering fields of mineral processing, metallurgy, thermal energy and power, chemical engineering, oil refining and the like. For the pneumatic conveying process of high-temperature powder, the wall of the container is generally seriously scoured by particles, and in addition, the temperature of the conveying channel is changed from cold start to hot operation or in the reverse process, so that the thermal stress change caused by thermal expansion and cold contraction is caused, and therefore, the problems of thermal stress and abrasion need to be overcome simultaneously when the high-temperature powder conveying channel is designed.

In consideration of abrasion and heat insulation, wear-resistant refractory materials are generally poured in the conveying channel, expansion joints are generally reserved at the joints of the lining in consideration of thermal stress, and expansion joints and other structures are arranged at the expansion joints according to calculation results as appropriate.

However, when the lined powder conveying passage needs to be installed in the lined main equipment and the lined powder conveying passage is long, each section of the passage is usually fixedly connected with the outer wall of the main equipment in consideration of adverse factors such as vibration. Compared with the cold state, in the hot state, when the temperature of the inner lining powder conveying pipe wall in the main equipment is far higher than the temperature of the outer wall of the main equipment, each section of inner lining powder conveying passage has larger expansion elongation relative to the outer wall of the main equipment, so that an expansion gap must be reserved between every two sections of inner lining powder conveying passages. However, in a cold state, part of the conveying gas flow carries the powder to enter the reserved expansion gap, and the powder and part of the conveying gas are seriously leaked while the powder is scoured and abraded.

For the similar working conditions, if the metal expansion joint is used for connecting the two sections of powder conveying channels with the linings, the inner wall of the metal expansion joint is easily washed by high-temperature powder carried by airflow and worn, and in addition, the metal expansion joint is easily pulled to crack when the temperature is higher, so that two-phase flow leakage is caused. Therefore, in view of the above-mentioned severe working conditions, it is desirable to provide a powder conveying channel connection structure to overcome the problems of thermal stress and wear resistance.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a powder conveying channel connecting structure and a powder conveying channel connecting method which are simple in structure and convenient to install, so that the high-efficiency connection of channels under severe working conditions is realized, and the leakage of powder conveyed by force and the abrasion of the powder to a reserved expansion joint between lining channels are avoided.

In order to achieve the purpose, the invention adopts the technical scheme that:

a powder conveying channel connecting structure comprises an inner cylinder, an outer cylinder, an inner cylinder abrasion-proof block and an inner cylinder receiving ring;

the upper cut-off lining pipe and the lower cut-off lining pipe to be connected are both composed of a conveying pipe lining and a conveying pipe shell; the upper end of the inner cylinder is connected with an anti-abrasion block of the inner cylinder in a seamless manner, then is sleeved outside the lower cut-off lining pipe, and a radial gap is reserved between the inner cylinder and the lower cut-off lining pipe;

the outer cylinder is sleeved outside the inner cylinder, and the lower end of the outer cylinder is in seamless connection with the conveying pipe shell with the lining pipe at the lower section and is reserved with a radial gap with the inner cylinder.

Furthermore, the outer barrel is provided with an annular outer barrel bottom plate, the lower end of the outer barrel is connected with the outer barrel bottom plate in a seamless mode, and the outer barrel bottom plate is connected with the conveying pipe shell with the lining pipe in a seamless mode.

Furthermore, a plurality of triangular outer cylinder rib plates used for supporting the outer cylinder bottom plate are arranged below the outer cylinder bottom plate along the outer circle of the conveying pipe shell, one side of each triangular outer cylinder rib plate is connected with the bottom of the outer cylinder bottom plate, and the other side of each triangular outer cylinder rib plate is connected with the conveying pipe shell with the lining pipe in a seamless mode.

Further, the inner diameter d2 of the inner cylinder is larger than the outer diameter d1 of the outer shell of the conveying pipe with the lower section of the lining pipe, and the difference between the inner diameter d2 and the outer diameter d1 of the outer shell of the conveying pipe with the lower section of the lining pipe is 1-300 mm; the inner diameter d4 of the outer cylinder is larger than the outer diameter d3 of the inner cylinder, and the difference between the two is 1-500 mm.

Furthermore, the telescopic distance L2 of the inner cylinder is greater than the height L1 of an expansion joint between the upper cut-off strip lining pipe and the lower cut-off strip lining pipe, and the difference value between the upper cut-off strip lining pipe and the lower cut-off strip lining pipe is 1-500 mm; the dislocation height difference L3 between the inner cylinder and the outer cylinder is greater than the telescopic distance L2 of the inner cylinder, and the difference value between the two is 1-500 mm.

Furthermore, the material seal height L4 of the inner cylinder, the inner diameter d2 of the inner cylinder and the outer diameter d1 of the conveying pipe shell have the following constraint relation, namely the value of L4 is 2-20 times of the difference value of d2 and d 1.

Furthermore, the top of the inner lining of the conveying pipe with the lining pipe at the lower section is provided with a chamfer angle, and the chamfer angle theta is smaller than 90 degrees.

Further, the outer edge of the bottom of the inner cylinder is provided with an oblique angle which is not less than 30 degrees.

Furthermore, the upper end of the inner cylinder anti-abrasion block is not lower than the lower edge of the upper cut-off lining pipe, and the lower end of the inner cylinder anti-abrasion block is not higher than the upper edge of the lower cut-off lining pipe.

A powder conveying channel connecting method comprises the following steps:

1) outer cylinder module assembly

Welding the lower end of the outer cylinder with a conveying pipe shell of a lower cut-off lining pipe at a specified elevation;

2) inner barrel module assembly

Firstly, one end of an inner cylinder and one end of an inner cylinder anti-abrasion block are circumferentially and fully welded; then, the other end of the inner cylinder wear-resistant block and the inner cylinder bearing ring are welded in a full-circle mode; finally, fully welding an inner cylinder bearing ring and the conveying pipe outer shell with the upper cutting lining pipe in the circumferential direction;

3) inner and outer tube assembly

And filling a proper amount of conveyed powder into a radial annular gap formed by the outer cylinder and the lower cut-off lining pipe, and inserting the inner cylinder into the outer cylinder through the relative movement of the upper cut-off lining pipe and the lower cut-off lining pipe.

The invention has the beneficial effects that:

according to the invention, the connection of two sections of lined pipes is realized by arranging the inner and outer cylinders which are sleeved with each other between the upper section of lined pipe to be connected and the lower section of lined pipe, a radial expansion gap is reserved between the inner and outer cylinders and the lined pipes, and an expansion gap is reserved between the ends of the two sections of lined pipes, so that the problem that the lined pipes are extruded and damaged due to expansion extension and radial expansion is avoided; when the inner and outer cylinder sleeve structure is installed, a proper amount of conveyed powder is filled into an annular gap formed by the outer cylinder and the lower section lining pipe, the inner cylinder plays a role in plugging the gap after being inserted into the outer cylinder, the risk of leakage of the powder from an expansion gap and the expansion gap is avoided, and reliable and efficient connection of channels is realized.

The invention has simple integral structure, can complete connection work only by welding at a plurality of places on site, is quick and convenient to install, eliminates the extrusion of the butt joint surface of the reserved expansion joint between the upper belt-cutting lining channel and the lower belt-cutting lining channel caused by thermal stress, and simultaneously avoids the leakage of pneumatically conveyed powder and the abrasion of the pneumatically conveyed powder to the reserved expansion joint between the lining channels.

The outer barrel is provided with an annular outer barrel bottom plate, a triangular outer barrel rib plate is arranged below the outer barrel bottom plate, so that the outer barrel is more convenient to mount, the outer barrel rib plate is arranged to ensure reliable support of the outer barrel, and connection failure of the outer barrel and a lower cut strip lining pipe is avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

in the figure: 1. the inner lining of the conveying pipe; 2. a delivery tube housing; 3. an inner barrel; 4. an outer cylinder; 5. an outer cylinder bottom plate; 6. a rib plate of the outer barrel; 7. an inner cylinder wear-resistant block; 8. an inner cylinder receiving ring; a. an upper cut-off lined pipe; b. the lower cut-off is lined with a pipe.

Detailed Description

The present invention will be described in further detail with reference to the following examples, which are not intended to limit the invention thereto.

As shown in fig. 1, the powder conveying channel connection structure of the present invention includes an inner cylinder 3, an outer cylinder 4, an outer cylinder bottom plate 5, an outer cylinder rib plate 6, an inner cylinder wear-resistant block 7, and an inner cylinder receiving ring 8. The upper cut-off lining pipe a and the lower cut-off lining pipe b for connection are both composed of a conveying pipe inner lining 1 and a conveying pipe outer shell 2.

The inner cylinder 3, the inner cylinder anti-abrasion block 7 and the inner cylinder receiving ring 8 are sequentially combined in a seamless connection mode and are finally connected with the conveying pipe shell 2 of the upper cut-off lining pipe a in a seamless mode, specifically, the upper end of the inner cylinder 3 is connected with the inner cylinder anti-abrasion block 7 in a seamless mode and then sleeved outside the lower cut-off lining pipe b, a radial gap is reserved between the inner cylinder anti-abrasion block and the lower cut-off lining pipe b, the inner cylinder receiving ring 8 is sleeved outside the upper cut-off lining pipe a and connected with the conveying pipe shell 2 of the upper cut-off lining pipe a in a seamless mode, an expansion gap is reserved between the ends of the upper cut-off lining pipe a and the lower cut-off lining pipe b, and the inner cylinder anti-abrasion block 7 is located at the expansion gap;

the outer cylinder 4 is sleeved outside the inner cylinder 3, the lower end of the outer cylinder 4 is in seamless connection with the conveying pipe shell 2 with the lining pipe b at the lower section, and a radial gap is reserved between the conveying pipe shell and the inner cylinder 3.

In order to facilitate the installation of the outer cylinder 4, the outer cylinder 4 is provided with an annular outer cylinder bottom plate 5, the lower end of the outer cylinder 4 is in seamless connection with the outer cylinder bottom plate 5, and the outer cylinder bottom plate 5 is in seamless connection with the conveying pipe shell 2 with a lining pipe b at the lower section; 4-6 triangular outer barrel rib plates 6 for supporting the outer barrel bottom plate 5 are vertically arranged below the outer barrel bottom plate 5 at equal intervals along the excircle of the conveying pipe shell 2, one side of each triangular outer barrel rib plate 6 is in seamless connection with the bottom of the outer barrel bottom plate 5, and the other side of each triangular outer barrel rib plate 6 is connected with the conveying pipe shell 2 with the lower cut lining pipe b, so that the upper outer barrel 4 and the outer barrel bottom plate 5 are supported, and the outer barrel 4 is firmly fixed outside the conveying pipe shell 2 with the lower cut lining pipe b.

The inner diameter d2 of the inner cylinder 3 is larger than the outer diameter d1 of the conveying pipe shell 2, and the difference value of the two is within the range of 1-300 mm; the inner diameter d4 of the outer cylinder 4 is larger than the outer diameter d3 of the inner cylinder 3, and the difference between the two is within the range of 1-500 mm; the telescopic distance L2 of the inner cylinder 3 is greater than the height L1 of the expansion joint of the conveying pipe inner liner 1, and the difference between the two is within the range of 1-500 mm; the dislocation height difference L3 between the inner cylinder 3 and the outer cylinder 4 is greater than the telescopic distance L2 of the inner cylinder 3, and the difference value of the two is within the range of 1-500 mm; the top chamfer theta of the conveying pipe inner liner 1 of the lower cut-off lining pipe b is less than 90 degrees.

The material sealing height L4 of the inner cylinder 3, the inner diameter d2 of the inner cylinder 3 and the outer diameter d1 of the conveying pipe shell 2 have the following constraint relation, namely the value of L4 is 2-20 times of the difference value of d2 and d 1.

The outer edge of the inner cylinder 3 close to the bottom side is set to be an oblique angle which is not less than 30 degrees.

The invention relates to a powder conveying channel connecting method based on a powder conveying channel connecting structure, which comprises the following steps:

firstly, assembling an outer cylinder module, namely welding an outer cylinder rib plate 6 with a conveying pipe shell 2 of a lower section lining pipe b at a specified elevation; and naturally dropping the outer cylinder bottom plate 5 to the upper end face of the outer cylinder rib plate 6 and performing annular full welding around the conveying pipe shell 2. And naturally dropping the outer cylinder 4 to the upper end surface of the outer cylinder bottom plate 5 and performing circumferential full welding.

And then, assembling the inner cylinder module, namely, performing annular full welding on the inner cylinder 3 and the inner cylinder anti-abrasion block 7, performing annular full welding on the other end of the inner cylinder anti-abrasion block 7 and the inner cylinder bearing ring 8, and performing annular full welding on the inner cylinder bearing ring 8 and the conveying pipe shell 2 of the upper cut-off lining pipe a, wherein the upper end of the inner cylinder anti-abrasion block 7 is not lower than the lower edge of the upper cut-off lining pipe a and the lower end of the inner cylinder anti-abrasion block 7 is not higher than the upper edge of the lower cut-off lining pipe b during installation.

Finally, a proper amount of conveyed powder is filled into an annular gap formed by the outer cylinder 4 and the lower cut-off lining pipe b, and the inner cylinder 3 is inserted into the outer cylinder 4 through the relative movement of the upper cut-off lining pipe a and the lower cut-off lining pipe b, so that the installation is completed.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. The utility model provides a powder transfer passage connection structure which characterized in that: comprises an inner cylinder (3), an outer cylinder (4), an inner cylinder anti-abrasion block (7) and an inner cylinder bearing ring (8);

the upper cut-off belt lining pipe (a) and the lower cut-off belt lining pipe (b) to be connected are both composed of a conveying pipe lining (1) and a conveying pipe shell (2); the upper end of the inner cylinder (3) is connected with an inner cylinder anti-abrasion block (7) in a seamless mode and then sleeved outside the lower cut-off lining pipe (b), a radial gap is reserved between the inner cylinder anti-abrasion block (7) and the lower cut-off lining pipe (b), the inner cylinder anti-abrasion block (7) is connected with an inner cylinder bearing ring (8) in a seamless mode, the inner cylinder bearing ring (8) is sleeved outside the upper cut-off lining pipe (a) and connected with the conveying pipe shell (2) of the upper cut-off lining pipe (a) in a seamless mode, an expansion gap is reserved between the ends of the upper cut-off lining pipe (a) and the lower cut-off lining pipe (b), and the inner cylinder anti-abrasion block (7) is located at the expansion gap;

the outer cylinder (4) is sleeved outside the inner cylinder (3), the lower end of the outer cylinder (4) is connected with the conveying pipe shell (2) with the lower section lining pipe (b) in a seamless mode, and a radial gap is reserved between the conveying pipe shell and the inner cylinder (3).

2. The powder conveying passage connection structure according to claim 1, wherein: the outer barrel (4) is provided with an annular outer barrel bottom plate (5), the lower end of the outer barrel (4) is in seamless connection with the outer barrel bottom plate (5), and the outer barrel bottom plate (5) is in seamless connection with a conveying pipe shell (2) with a lining pipe (b) cut below.

3. The powder conveying passage connection structure according to claim 2, wherein: a plurality of triangular outer cylinder rib plates (6) used for supporting the outer cylinder bottom plate (5) are arranged below the outer cylinder bottom plate (5) along the excircle of the conveying pipe shell (2), one side of each triangular outer cylinder rib plate (6) is connected with the bottom of the outer cylinder bottom plate (5), and the other side of each triangular outer cylinder rib plate is connected with the conveying pipe shell (2) of the lower section lining pipe (b) in a seamless mode.

4. The powder conveying passage connection structure according to claim 3, wherein: the inner diameter d2 of the inner cylinder (3) is larger than the outer diameter d1 of the conveying pipe shell (2) of the lower cut-off lining pipe (b), and the difference between the two is in the range of 1-300 mm; the inner diameter d4 of the outer cylinder (4) is larger than the outer diameter d3 of the inner cylinder (3), and the difference between the two is 1-500 mm.

5. The powder conveying passage connection structure according to claim 3, wherein: the telescopic distance L2 of the inner cylinder (3) is greater than the height L1 of an expansion gap between the upper cut-off strip lining pipe (a) and the lower cut-off strip lining pipe (b), and the difference between the two is 1-500 mm; the dislocation height difference L3 between the inner cylinder (3) and the outer cylinder (4) is larger than the telescopic distance L2 of the inner cylinder (3), and the difference value is 1-500 mm.

6. The powder conveying passage connection structure according to any one of claims 1 to 5, wherein: the material sealing height L4 of the inner cylinder (3), the inner diameter d2 of the inner cylinder (3) and the outer diameter d1 of the conveying pipe shell (2) have the following constraint relation, namely the value of L4 is 2-20 times of the difference value between d2 and d 1.

7. The powder conveying passage connection structure according to any one of claims 1 to 5, wherein: the top of the conveying pipe inner liner (1) of the lower cut-off lining pipe (b) is provided with a chamfer angle, and the chamfer angle theta is smaller than 90 degrees.

8. The powder conveying passage connection structure according to claim 8, wherein: the outer edge of the bottom of the inner barrel (3) is provided with an oblique angle which is not less than 30 degrees.

9. The powder conveying passage connection structure according to claim 8, wherein: the upper end of the inner cylinder anti-abrasion block (7) is not lower than the lower edge of the upper belt cutting lining pipe (a), and the lower end of the inner cylinder anti-abrasion block (7) is not higher than the upper edge of the lower belt cutting lining pipe (b).

10. A powder conveying passage connecting method based on the connecting structure of claim 1, characterized by comprising the steps of:

1) outer cylinder module assembly

Welding the lower end of the outer cylinder (4) with a conveying pipe shell (2) of a lower cut-off lining pipe (b) at the designated calibration height;

2) inner barrel module assembly

Firstly, one end of an inner cylinder (3) and one end of an inner cylinder anti-abrasion block (7) are circumferentially and fully welded; then, the other end of the inner cylinder anti-abrasion block (7) and the inner cylinder bearing ring (8) are welded in a full circumferential mode; finally, the inner cylinder bearing ring (8) and the conveying pipe shell (2) with the upper section of the lining pipe (a) are welded fully in the circumferential direction;

3) inner and outer tube assembly

A proper amount of conveyed powder is filled into a radial annular gap formed by the outer cylinder (4) and the lower cut-off lining pipe (b), and the inner cylinder (3) is inserted into the outer cylinder (4) through the relative movement of the upper cut-off lining pipe (a) and the lower cut-off lining pipe (b).