CN211739981U - Rib pipe and rib pipe external heat collector - Google Patents

Abstract

The utility model discloses a fin pipe and fin outside of tubes heat collector in petrochemical field to solve the fin optimization problem that current bushing type fin got the heat pipe, and consequently improve and get heat pipe heat transfer effect. The ribbed pipe consists of base pipe and ribs set on the outer surface of the base pipe and perpendicular to the outer surface of the base pipe. The cross section of each fin is in an isosceles triangle shape, the two ends of each fin are provided with low fins, the middle part of each fin is provided with a high fin, and the two ends of each two adjacent fins are arranged in a staggered mode in the axial direction of the base pipe. The rib is provided with small holes with the diameter of 1/4-1/3 of the rib height, the distance between the small holes is 10-15 times of the hole diameter, and the distance between the center of each small hole and the top of the rib is 30-40% of the rib height. The heat-taking pipe is a sleeve type fin heat-taking pipe arranged in the heat-taking device outside the fin pipe, and the heat-taking pipe adopts the fin pipe with the structure. The utility model discloses can be used to the heavy oil catalytic cracking unit etc. of petroleum processing trade.

Description

Rib pipe and rib pipe external heat collector

Technical Field

The utility model belongs to the technical field of the heat exchange, concretely relates to be used for one kind of heat exchange with fin pipe and a fin intraductal outer heat collector.

Background

In a catalytic cracking unit in the petrochemical industry, a catalyst circulates between a reactor and a regenerator; the deactivated catalyst is burnt and regenerated in the regenerator, and the regenerated catalyst is circulated back to the reactor. Typically a heavy oil catalytic cracking unit. The coking reaction of the catalyst in the regenerator needs to release a large amount of heat, and when the heat exceeds the heat required by the catalytic reaction, an external heat exchanger is required to absorb the excessive heat, so that the smooth operation of the process is ensured. Meanwhile, the external heat collector also utilizes the surplus heat to generate steam, and an external heat-taking steam generation system becomes an important energy-saving measure in the catalytic cracking device. The external heat collector has wide industrial application due to large heat collection quantity and flexible and convenient operation.

There are many types of external heat sinks available, of which the finned tube (also known as finned tube) external heat sink is one type. Chinese patent ZL201220342676.5 discloses a finned tube and an external heat collector of the finned tube, wherein the finned tube is composed of a base tube and fins which are arranged on the outer surface of the base tube, are perpendicular to the outer surface of the base tube and are arranged longitudinally. The fins are full-length fins; the two ends of the heat exchanger are provided with low fins, the height of the heat exchanger is 18-24 mm, the middle part of the heat exchanger is provided with high fins, and the height of the heat exchanger is 28-30 mm. Two ends of two adjacent fins are staggered in the axial direction of the base tube. The finned tube is characterized in that a sleeve type finned heat transfer tube is arranged in the finned tube external heat collector, and a finned tube section of a steam sleeve of the sleeve type finned heat transfer tube adopts the finned tube with the structure. The finned tube external heat collector for oil refinery includes one vertically set cylindrical casing with several sleeve type finned heat collecting tubes set vertically inside the casing. Each sleeve type fin heat-taking pipe is of a closed structure and mainly comprises a water supply pipe and a steam-water mixture sleeve pipe arranged around the outer surface of the water supply pipe. Each sleeve type heat taking pipe is an independent heat transfer element and forms a heat transfer unit with an independent water-steam loop. The steam-water mixture sleeve is divided into a ribbed pipe section and a light pipe section, the outer surface of a base pipe of the ribbed pipe section is densely covered with longitudinally arranged through long ribs, and the ribs are vertical to the outer surface of the base pipe and are arranged in a staggered mode. The sleeve type fin heat-taking pipe and the fin pipe external heat-taking device adopting the same have the advantages that the sleeve type fin heat-taking pipe of one unit has problems, and the use of the whole external heat-taking device is not influenced; the pattern of the through long fins can also ensure that the external heat collector has enough heat collecting area when in work. There are major problems: the fin form should be further optimized to increase the heat transfer coefficient with minimal material consumption.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a finned tube and a finned tube external heat collector to solve the technical problem of low heat transfer coefficient of the prior art heat exchanger.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the utility model provides a ribbed tube, by the parent tube with locate on the parent tube surface, with the surface looks vertically of parent tube and vertically set up the fin constitute its characterized in that: the cross section of the rib is an isosceles triangle, and the base tube is a light pipe.

The utility model relates to a finned tube, its further characterized in that: the fins are full-length fins, namely the total length of each fin is basically the same as that of a fin tube, the two ends of each fin are low fins, the length M of each low fin is 300-400 mm, the height h of each low fin is 18-24 mm, and the cross section of each low fin is trapezoidal; the middle part of each fin is a high fin, and the height H of each high fin is 28-30 mm.

The utility model relates to a finned tube, its further characterized in that: two adjacent fins are arranged in a staggered mode in the axial direction of the base pipe, and the staggered length b of the two adjacent fins in the fin pipe is 50-100 mm.

The utility model relates to a finned tube, its further characterized in that: the distance between two adjacent fins in the fin tube is 15-20 mm, the thickness of the fin is 6-8 mm, wherein the thickness of the fin refers to the length of the bottom side of an isosceles triangle.

The utility model relates to a finned tube, its further characterized in that: the rib is provided with small holes, the diameter phi of each small hole is 1/4-1/3 of the height of the high rib, the distance p between the small holes is 10-15 times of the aperture, and the distance L between the center of each small hole and the top of the rib is 30-40% of the height of the high rib.

The utility model also provides an outer heat collector of fin pipe, the technical scheme who adopts is:

a finned tube external heat collector comprises a vertically arranged cylindrical shell, wherein at least one sleeve type finned heat collecting tube is vertically arranged in the shell, the sleeve type finned heat collecting tube is of a closed structure and is composed of a steam-water mixture sleeve formed by inserting a water supply tube into a pipeline, the lower end part of the pipeline is welded with a seal head for closing, and an inner tube and an outer tube form a heat transfer unit with an independent water-steam loop; the steam-water mixture sleeve is divided into a fin pipe section and a light pipe section, and is characterized in that: the cross section of the rib pipe section is an isosceles triangle, the cross section perpendicular to the axis of the external heat collector is used as a boundary line of the rib pipe section and the light pipe section, the full-length rib pipe is arranged below the cross section, the light pipe is arranged above the cross section, and the cross section is a plane where the lowest intersection point of the outer walls of the external heat collector and the catalyst inlet pipe is located in the using state.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: the fins are full-length fins, namely the total length of each fin is basically the same as that of a fin tube, the two ends of each fin are low fins, the length M of each low fin is 300-400 mm, the height h of each low fin is 18-24 mm, and the cross section of each low fin is trapezoidal; the middle part of each fin is a high fin, and the height H of each high fin is 28-30 mm.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: two adjacent fin both ends are at the axial of base tube stagger arrangement, the staggered length b of two adjacent fin both ends in the fin pipe is 50 ~ 100 millimeters.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: the distance between two adjacent fins in the fin tube is 15-20 mm, and the thickness of the fin is 6-8 mm.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: the rib is provided with small holes, the diameter phi of each small hole is 1/4-1/3 of the height of the high rib, the distance p between the small holes is 10-15 times of the hole diameter, and the distance L between the center of each small hole and the top of the rib is 30-40% of the height of the high rib.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: the height between the lower opening of the water supply pipe and the inner bottom of the bottom seal head of the steam-water mixture sleeve is 1.0-1.5 times of the pipe diameter of the water supply pipe.

The utility model relates to a fin outside of tubes ware of getting, its further characterized in that: the distance between the sleeve type fin heat taking pipe and the wall of the shell is 45-100 mm; the distance between two adjacent sleeve type fin heat taking pipes is 45-100 mm.

Compared with the prior art, the fin tube and the fin tube external heat collector of the utility model have the following effects: the heat transfer efficiency of the ribbed tube is remarkably improved, and the rib efficiency is improved by 60 percent compared with that of rectangular ribs with the same thickness and the same height.

Compared with the fins with the same thickness and the rectangular cross section, the fins with the triangular cross sections have the rib efficiency improved by 60 percent, and the heat transfer efficiency of the heat taking pipe can be improved by adopting the fins with the triangular cross sections.

The present invention will be described in further detail with reference to the drawings and the detailed description, which should not be construed as limiting the scope of the invention.

Drawings

Fig. 1 is a schematic structural view of a ribbed tube of the present invention;

FIG. 2 is a schematic view of the structure of the ribbed pipe fin of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic structural view of the bushing type fin heat-removing tube of the present invention;

FIG. 5 is a schematic structural view of the finned tube external heat collector of the present invention;

fig. 6 is a sectional view a-a of fig. 5.

The reference numbers shown in the figure are 1-water supply pipe, 2-holes on fins, 3-degassing holes, 4-sleeves, 5-sleeve-type fin heat-taking pipes, 6-guide support, 7-fluidized air distributor, 8-catalyst inlet, 9-catalyst outlet, 10-base pipe, 11-hyperbolic fins, 12-steam-water mixture outlet, 13-limiting pipe, 101-water inlet, 102-water outlet, 111-high fins, 113-low fins, 201-end enclosure and 202-external heat-taking device shell.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in attached figure 1, attached figure 2 and attached figure 3, the ribbed tube of the present invention is composed of a base tube 10 and hyperbolic fins 11 which are arranged on the outer surface of the base tube, are vertical to the outer surface of the base tube and are vertically arranged, and the fins 11 are welded on the outer surface of the base tube 10. The fins 11 are arranged longitudinally, that is, in the direction along the axial line of the base pipe 10. The fins 11 are full-length fins, namely the total length of each fin is basically the same as the length of a fin tube, the two ends of each fin are low fins 112, the height H is 18-24 mm, the length M is 300-400 mm, the middle part of each fin is a high fin 111, the height H is 28-30 mm, the two ends of each two adjacent fins are arranged in a staggered mode in the axial direction of the base tube, the staggered length b is 50-100 mm, the thickness of each fin is 6-8 mm, and the distance between every two adjacent fins 11 is 15-20 mm. The rib is provided with small holes with the diameter of 1/4-1/3 of the height of the rib, the distance between the small holes is 10-15 times of the aperture, and the distance between the center of each small hole and the top of the rib is 30-40% of the height of the rib.

The number of the fins 11 and the total length of the fins 11 on the fin tube of the utility model are calculated and determined according to the heat transfer requirement. The ribbed tube is made using conventional materials and methods.

Fig. 4 shows a sleeve type fin heat-taking tube using the fin tube of the present invention. The sleeve type fin heat taking pipe 5 is composed of a water supply pipe 1 and a steam-water mixture sleeve 4 arranged around the outer surface of the water supply pipe 1, and a water-steam flowing annular space is formed between the outer surface of the water supply pipe 1 and the inner surface of the steam-water mixture sleeve 4. The water supply pipe 1 is a light pipe; the steam-water mixture sleeve 4 is divided into two pipe sections of a ribbed pipe section and a light pipe section, wherein the ribbed pipe section is the ribbed pipe of the utility model. As shown in fig. 4, a water inlet 101 is arranged at the top of a water supply pipe 1 of the sleeve-type fin heat-taking pipe, a water outlet 102 is arranged at the bottom of the water supply pipe 1, and the water outlet 102 is positioned at the lower part inside a steam-water mixture sleeve 4. The upper part of the steam-water mixture sleeve 4 is provided with a steam-water mixture outlet 12, and a closed structure is arranged between the top of the steam-water mixture sleeve 4 and the outer wall of the water supply pipe 1. The bottom of the steam-water mixture sleeve 4 is provided with a limit pipe 13. In the use process, water is introduced into the water supply pipe 1 from a water inlet 101 at the top of the water supply pipe 1, flows downwards in the water supply pipe 1, flows out from a water outlet 102 at the bottom of the water supply pipe 1, enters an annular space between the outer surface of the water supply pipe 1 and the inner surface of the steam-water mixture sleeve 4, flows upwards, absorbs heat released by a heat release medium (such as a high-temperature catalyst), and the generated steam-water mixture flows out from a steam-water mixture outlet 12 at the upper part of the steam-water mixture sleeve 4. The sleeve-type finned heat-extraction tube 5 shown in fig. 4 is of closed construction and constitutes itself a heat-transfer unit with an independent water-vapour circuit. The sleeve type fin heat-taking pipe 5 mainly adopts a fin pipe with a hyperbolic cross section in a fin pipe section of the steam-water mixture sleeve 4, and the rest structure and the using process are basically the same as those of the existing sleeve type fin heat-taking pipe with a longitudinal through long fin pipe section in the fin pipe section.

The height h1 between the lower opening of a water supply pipe 1 in the sleeve type fin heat taking pipe and the inner bottom of a bottom end socket of a steam-water mixture sleeve 4 is 1.0-1.5 times of the pipe diameter d of the water supply pipe 1.

Fig. 5 and 6 are schematic views of the finned tube external heat exchanger (external heat exchanger for short) according to the present invention. It comprises a vertically arranged cylindrical shell 202, and the top of the shell 202 is provided with a seal head 201. A plurality of sleeve type fin heat extraction pipes 5 are vertically arranged in the shell 202, and a guide bracket 6 is arranged below the sleeve type fin heat extraction pipes 5. The sleeve type fin heat-taking pipe 5 is of the type shown in fig. 4, see fig. 4 and the related text. At least one sleeve type fin heat-taking pipe 5 is arranged in the external heat-taking device. One end of each sleeve type fin heat taking pipe 5 is fixed on the seal head 201, and the other end inserts the limiting pipe 13 into the limiting hole of the guide support 6, is limited by the guide support 6 and can freely stretch out and draw back. The shell 202 is provided with a catalyst inlet 8, a catalyst outlet 9 and a degassing port 3, and a fluidized air distributor 7 is arranged at the lower part in the shell 202 and below the guide bracket 6. The inner walls of the shell 202 and the end socket 201 are provided with heat-insulating wear-resistant linings with high temperature resistance. As shown in fig. 5, the steam-water mixture sleeve 4 of each sleeve-type fin heat-taking pipe 5 is provided with a fin pipe section below the cross section of the outer heat-taking device shell where the lowest intersection point of the outer wall of the catalyst inlet pipe 8 and the outer heat-taking device shell is located, and a light pipe section above the plane.

The clear distance between the sleeve type fin heat-taking pipe and the wall of the shell 202 (based on the fin closest to the wall, the distance between the top end of the fin and the wall) is more than 30 mm; the distance between two adjacent sleeve type fin heat extraction pipes (referring to the top ends of two adjacent fins) is more than 30 mm.

The operation of the external heat exchanger shown in FIG. 5 as an external heat exchanger of a catalytic cracking unit is as follows: the high temperature catalyst from the regenerator of the catalytic cracking unit enters the external heat remover through the catalyst inlet pipe 8, and forms a section of dense phase catalyst bed in the external heat remover. Fluidized air enters the catalyst bed layer through the fluidized air distributor 7, so that the catalyst is in a fluidized state, and the heat release effect of the high-temperature catalyst on the sleeve type fin heat-taking pipe 5 is enhanced. The exothermically cooled catalyst is discharged into a regenerator of the catalytic cracking unit through a catalyst outlet pipe 9, so that the cooling circulation process of the catalyst in an external heat remover is completed. The flue gas entrained in the fluidized catalyst is discharged back to the regenerator through degassing port 3. Water is introduced into a water inlet at the top of a water supply pipe 1 by each sleeve type fin heat extraction pipe 5, the water flows in the sleeve type fin heat extraction pipes 5, and heat emitted by a high-temperature catalyst is absorbed to generate a steam-water mixture; the steam-water mixture flows out from a steam-water mixture outlet 12 at the upper part of the steam-water mixture sleeve 4. During the above operation, each sleeve-type fin heat-extracting pipe 5 constitutes a heat-transfer unit with an independent water-steam circuit. The surplus heat brought by the high-temperature catalyst from the regenerator of the catalytic cracking unit is continuously taken away by the steam-water mixture generated by the sleeve type fin heat-taking pipe 5.

The external heat collector shown in fig. 5 mainly uses the sleeve type fin heat-collecting tube 5 shown in fig. 4, and the fin tube section of the steam-water mixture sleeve 4 of the sleeve type fin heat-collecting tube 5 uses the fin tube of the present invention. The rest of the structure of the external heat remover and the heat removing operation process used for the catalytic cracking unit shown in fig. 5 are basically the same as those of the prior rib tube external heat remover provided with the sleeve-type rib heat removing tube.

The present invention has been described in detail with reference to the accompanying drawings and the detailed description. In fig. 1 to 6 of the present invention, the same reference numerals denote the same features. In fig. 4 and 5, the arrow without reference sign indicates the flow direction of water, steam-water mixture, fluidized wind, flue gas, or catalyst.

The external heat collector of the utility model is mainly used for the catalytic cracking device in the petroleum processing industry and other catalytic cracking devices similar to the technical process, such as MTO (methanol to olefin) device and HCC (direct cracking of heavy oil to olefin) device; but also to other heat transfer locations with similar requirements. The finned tube of the present invention can be used as an independent heat transfer element, for example, in a heat exchanger similar to the working condition of the novel external heat exchanger. And adopt the utility model discloses the sleeve type fin heat extraction pipe of fin pipe then can be arranged in above-mentioned catalytic conversion device's outer heat collector or interior heat collector, or be arranged in the shell and tube boiler of similar operating mode.

Claims (10)

1. The utility model provides a ribbed tube, by the parent tube with locate on the parent tube surface, with the surface looks vertically of parent tube and vertically set up the fin constitute its characterized in that: the cross section of each fin is an isosceles triangle, and the base tube is a light pipe; the fin is a through long fin, the two ends of the fin are low fins, the length M of each low fin is 300-400 mm, the cross section of each low fin is trapezoidal, and the height h of each low fin is 18-24 mm; the middle part of each fin is a high fin, and the height H of each high fin is 28-30 mm; the rib is provided with small holes, the diameter phi of each small hole is 1/4-1/3 of the height of the high rib, the distance p between the small holes is 10-15 times of the hole diameter, and the distance L between the center of each small hole and the top of the rib is 30-40% of the height of the high rib.

2. The finned tube of claim 1, wherein: two adjacent fins are arranged in a staggered mode in the axial direction of the base pipe, and the staggered length b of the two adjacent fins in the fin pipe is 50-100 mm.

3. The finned tube of claim 1, wherein: the distance between two adjacent fins in the fin tube is 15-20 mm, and the thickness of the fins is 6-8 mm.

4. A finned tube external heat collector comprises a vertically arranged cylindrical shell, wherein at least one sleeve type finned heat collecting tube is vertically arranged in the shell, the sleeve type finned heat collecting tube is of a closed structure and is composed of a steam-water mixture sleeve formed by inserting a water supply tube into a pipeline, the lower end part of the pipeline is welded with a seal head for closing, and an inner tube and an outer tube form a heat transfer unit with an independent water-steam loop; the steam-water mixture sleeve is divided into a fin pipe section and a light pipe section, and is characterized in that: the cross section of the rib pipe section is an isosceles triangle, the cross section of the rib pipe section and the light pipe section perpendicular to the axis of the external heat collector is used as a dividing line, the full-length rib pipe is arranged below the cross section, and the light pipe is arranged above the cross section.

5. The finned out-of-tube heat extractor of claim 4, wherein: the fin is a through long fin, the two ends of the fin are low fins, the length M of each low fin is 300-400 mm, the height h of each low fin is 18-24 mm, and the cross section of each low fin is trapezoidal; the middle part of each fin is a high fin, and the height H of each high fin is 28-30 mm.

6. The finned out-of-tube heat extractor of claim 4, wherein: two adjacent fins are arranged in a staggered mode in the axial direction of the base pipe, and the staggered length b of the two adjacent fins in the fin pipe is 50-100 mm.

7. The finned out-of-tube heat extractor of claim 4, wherein: the distance between two adjacent fins in the fin tube is 15-20 mm, and the thickness of the fin is 6-8 mm.

8. The finned out-of-tube heat extractor of claim 4, wherein: the rib is provided with small holes, the diameter phi of each small hole is 1/4-1/3 of the height of the high rib, the distance p between the small holes is 10-15 times of the hole diameter, and the distance L between the center of each small hole and the top of the rib is 30-40% of the height of the high rib.

9. The finned out-of-tube heat extractor of claim 4, wherein: the height from the end surface of the lower opening of the water supply pipe to the inner bottom of the bottom seal head of the steam-water mixture sleeve is 1.0-1.5 times of the inner diameter of the water supply pipe.

10. The finned out-of-tube heat extractor of claim 4, wherein: the distance between the sleeve type fin heat taking pipe and the wall of the shell is more than 30 mm; the distance between two adjacent sleeve type fin heat taking pipes is more than 30 mm.

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