CN111609736A

CN111609736A - Regenerator built-in heat collector

Info

Publication number: CN111609736A
Application number: CN201910139531.1A
Authority: CN
Inventors: 杨宏伟
Original assignee: Sinopec Engineering Group Co Ltd; Sinopec Guangzhou Engineering Co Ltd
Current assignee: Sinopec Engineering Group Co Ltd; Sinopec Guangzhou Engineering Co Ltd
Priority date: 2019-02-26
Filing date: 2019-02-26
Publication date: 2020-09-01

Abstract

The invention discloses a regenerator built-in heat collector in the technical field of petrochemical heat exchange, which consists of a heat collecting pipe unit, an isolation shell and a lifting air system, and is characterized in that: the heat extraction pipe unit is arranged in the cavity, and the lifting air system is arranged under the heat extraction pipe unit. Compared with the temperature of an external heat-removal regulating regenerator, the internal heat-removal device of the regenerator saves an external heat-removal system; compared with internal heat extraction, the heat quantity is adjustable, and the investment can be greatly reduced.

Description

Regenerator built-in heat collector

Technical Field

The invention belongs to the technical field of petrochemical heat exchange, and particularly relates to a regenerator built-in heat collector with adjustable heat load in the field of heat exchange.

Background

In petrochemical industry catalytic cracking units, catalyst is circulated between a reactor and a regenerator; the deactivated catalyst is burnt and regenerated in the regenerator, and the regenerated catalyst returns to the reactor to participate in the next reaction. 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, the heat needs to be taken away, so that the stable process operation is ensured. Meanwhile, the part of the excess heat which is taken away generates steam, so that the energy consumption of the catalytic cracking unit can be obviously reduced.

There are two conventional regenerator heat removal methods: the first heat-taking mode is to arrange an external heat-taking device, namely the excess heat of the regenerator is taken away by the circulation of the catalyst between the regenerator and the external heat-taking device, and the first heat-taking mode has the defect that the external heat-taking device with large investment and a regulating system are required to be arranged, and a plurality of patents are applied at home and abroad; the second is that the internal heat extraction tube bundle is arranged in the regenerator to directly extract heat, but the technical problem that the heat extraction load of the heat extraction tube bundle cannot be adjusted exists, so that the regenerator cannot adapt to the change of working conditions and can only be used as an auxiliary heat extraction means.

This patent provides such a heat-extraction pattern: a space is divided in the regenerator, a sufficient heat taking unit is arranged in the space according to the requirement, and the amount of the catalyst passing through the heat taking unit is controlled by lifting air, so that the aims of taking away the redundant heat of the regenerator and adapting to variable working conditions are fulfilled.

Disclosure of Invention

The invention aims to provide a built-in heat collector with an adjustable regenerator heat load, which aims to solve the technical problems that in the prior art, the investment and the operation workload are increased because an external heat collector is arranged in the regenerator, and the heat collecting load of an internal heat collecting pipe bundle cannot be adjusted.

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

the utility model provides a built-in heat collector of regenerator, by getting hot tube unit, keep apart the casing, promote the wind system and constitute which characterized in that: the heat extraction pipe unit is arranged in the cavity, and the lifting air system is arranged under the heat extraction pipe unit.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the isolation shell is a metal shell or takes metal as a framework, a heat-insulating wear-resistant non-metal lining is arranged on the surface (one side or two sides) of the metal shell, two wings are welded on the wall of the regenerator, the upper end and the lower end of the two wings are through, and the two wings and the wall of the regenerator provide an independent space for the heat-taking unit together, so that the heat load is adjustable. The liner may have a double layer structure or a single layer structure. The left wing and the right wing of the isolation shell are connected with the outer wall of the regenerator, the isolation shell can be made into a flat-bottom U shape, a convex-bottom U shape, a concave-bottom U shape or an arc shape concentric with the regenerator wall and an arc shape concentric with the regenerator wall in practical application or directly made into an arc shape, the specific shape is not required, and the arrangement of the heat taking unit is only required.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the length of the isolation shell can completely comprise the heat taking pipe unit in the cavity.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the heat taking pipe units are sleeve type heat taking pipe structures, each sleeve type heat taking pipe is a closed type steam-water circulation structure and is composed of an outer sleeve formed by inserting a water supply pipe into a large pipe, and the water supply pipe and the outer sleeve form a steam-water mixture sleeve together.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the lower end of the outer sleeve is welded and sealed by a seal head, the outlet end face of the water supply pipe (positioned at the lower end in the outer sleeve) is not connected with the outer sleeve, and the inner pipe and the outer pipe form a heat transfer unit with an independent water-steam loop; the height from the lower opening of the water supply pipe of the heat taking pipe unit 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. The outer sleeve end socket is provided with a limiting pipe, the limiting pipe is inserted into the guide frame to maintain the position of the heat taking pipe, and the guide frame is welded on the inner wall of the regenerator. The steam-water mixture outlet and the water feeding port of the outer sleeve are arranged at the same end of the heat taking unit.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the steam-water mixture sleeve is divided into a fin type and a light pipe type, fins in any form are not arranged on the outer surface of the sleeve of the light pipe type heat taking unit, the fins are arranged on the outer surface of the fin type steam-water mixture sleeve, and the fins are longitudinally arranged along the axial direction of the heat taking pipe.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the number of the heat taking pipe units is determined according to the heat taking quantity, and the heat taking pipe units can be arranged in a single row or in two or more rows.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the distance between the central plane of the wind lifting system and the lowest point of the heat taking pipe unit is 300-2000 mm.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the lifting air system is a metal pipeline assembly and consists of a lifting air inlet pipe and an air distribution pipe, and the inlet pipe traverses the outer wall of the regenerator and is connected with the air distribution pipe; a nozzle is arranged in the air distribution pipeline. The number of the nozzles is determined according to the lifting air volume required by the circulating transportation of the heat-taking catalyst. The nozzles may be arranged in a single row or in multiple rows. The nozzle outlet orientation is the same or at an angle less than 90 deg. to the circulating catalyst flow direction. The outlet end of the nozzle is fixed on the air distribution pipe along the radius direction of the air distribution pipe, and the nominal diameter phi of the air distribution pipe is DN 80-DN 1000. The diameter size range of the nozzle is 25-300 mm, and the length size range is 30-1000 mm. The air distribution pipes can be arranged by one to 10 according to the arrangement number of the heat taking units.

The invention relates to a regenerator built-in heat collector, which is further characterized in that: the distance between the outermost edge of the heat taking pipe unit and the wall of the isolation shell and the regenerator is 45-100 mm; the outermost edge distance of two adjacent heat taking pipe units is 45-100 mm.

The invention is used for a catalytic cracking unit in the petrochemical industry and other catalytic cracking units similar to the technical process thereof, such as an MTO (methanol to olefin) unit and an HCC (direct cracking of heavy oil to olefin) unit.

The regenerator of the invention has the advantages that: compared with the temperature of the external heat-taking regulating regenerator, the external heat-taking system is omitted; compared with internal heat extraction, the heat quantity is adjustable, and the investment can be greatly reduced. Taking a small-sized 23256KW external heat exchanger as an example, the investment is saved by 71 ten thousand yuan according to the existing price of the equipment body, the investment accounts for about 40 percent of the total cost of the external heat exchanger, the corresponding civil engineering investment and the thermal expansion compensation investment are not counted, and the occupied area is saved by 6x6 square meters.

The present invention will be described in further detail with reference to the following drawings and detailed description, but the present invention is not limited to the scope of the present invention.

Drawings

FIG. 1 is a schematic diagram of a built-in regenerator of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is an enlarged schematic view of a heat-removing pipe unit of the regenerator built-in type heat collector of the present invention;

FIG. 4 is a schematic view of the sectional B-B lift wind system of FIG. 1 according to the present invention;

FIG. 5 is a schematic view of the C-C section riser nozzle of FIG. 4 according to the present invention;

FIG. 6 is a cross-sectional view of two versions of the nozzle of the lift fan assembly of FIG. 5 in accordance with the present invention.

Wherein the reference symbols shown are: 1-regenerator walls; 11-a sleeve type heat extraction unit; 22-an insulating housing; 33-lifting an air system, 11-1-a water supply pipe; 11-2-steam-water mixture sleeve; 11-3-a limiting pipe, 11-4-a guide frame, 11-5-a rib and 22-1-a metal framework of an isolation shell; 22-2-high temperature wear-resistant lining of the isolation shell, and 33-1-lifting air distribution pipe; 33-2-lifting air nozzle and 33-3-lifting air inlet pipe.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the heat collector of the present invention is composed of a heat collecting pipe unit 11, an isolation casing 22 and a lift air system 33. The basic type of the heat pipe taking unit 11 is a sleeve type heat pipe, the number of the heat pipe taking units is determined according to the heat taking quantity, and the heat pipe taking units can be arranged in a single row or in two or more rows. The heat-extracting pipe unit arranged in a single row is shown in figure 2. The sleeve type heat taking pipe (figure 3) is composed of a water supply pipe 11-1 and a steam-water mixture sleeve 11-2 arranged around the outer surface of the water supply pipe 11-1, and a water-steam flowing annular space is formed between the outer surface of the water supply pipe 11-1 and the inner surface of the steam-water mixture sleeve 11-2. The water supply pipe 1 is a light pipe; the steam-water mixture sleeve 11-2 can be a light pipe or a ribbed pipe, and the size of an optional rib with a rectangular cross section is 30mm in length and 6-8 mm in width. As shown in FIG. 3, a water inlet A1 is arranged at the side end of a water supply pipe 11-1 of the extension-type heat pipe, a water outlet A2 is arranged at the bottom of the water supply pipe 11-1, and a water outlet A2 is arranged at the lower part inside a steam-water mixture extension pipe 11-2. The upper part of the steam-water mixture sleeve 11-2 is provided with a steam-water mixture outlet B, and a closed structure is arranged between the bottom end part of the steam-water mixture sleeve 11-2 and the outer wall of the water supply pipe 11-1. The bottom of the steam-water mixture sleeve 11-2 is provided with a limiting pipe 11-3. In the use process, water is introduced into the water supply pipe 11-1 from a water inlet A1 at the top of the water supply pipe 11-1, flows downwards in the water supply pipe 11-1, flows out from a water outlet A2 at the bottom of the water supply pipe 11-1, enters an annular space between the outer surface of the water supply pipe 11-1 and the inner surface of the steam-water mixture sleeve pipe 11-2, flows upwards, and absorbs heat emitted by a heat-emitting medium (such as a high-temperature catalyst). The generated steam-water mixture flows out from a steam-water mixture outlet B at the upper part of the steam-water mixture sleeve 11-2. As can be seen from the above description, the double pipe heat extraction pipe shown in fig. 3 is of a closed construction, which itself constitutes a heat transfer unit with an independent water-steam circuit.

The height h1 between the lower opening of the water supply pipe 11-1 in the sleeve type heat taking pipe and the inner bottom of the bottom seal head of the steam-water mixture sleeve 11-2 is 1.0-1.5 times of the pipe diameter d of the water supply pipe 11-1.

The clear distance between the sleeve type heat taking pipe and the shell 22 and the wall of the regenerator is 45-100 mm; the distance between two adjacent sleeve type heat taking pipes is 45-100 mm. (e.g., with fins having a minimum distance from the top of the fin)

The operation of the heat remover shown in fig. 1 as a regenerator of a catalytic cracking unit for heat removal is as follows: the high temperature catalyst in the regenerator of the catalytic cracking unit is guided by the lifting air to flow through the heat taking unit of the heat collector from bottom to top, and the catalyst after heat release and cooling is discharged into the regenerator of the catalytic cracking unit from the upper part of the heat collector, thereby completing the cooling circulation process of the catalyst in the heat collector. Water is introduced from a water supply pipe port A1 of each sleeve type heat taking pipe 11-1, the water flows down to a water outlet A2 through the water supply pipe 11-1 and enters an annular flow passage formed by the water supply pipe 11-1 and the sleeve pipe 11-2, and heat emitted by a high-temperature catalyst is absorbed in the process of rising along the annular flow passage to generate a steam-water mixture; the steam-water mixture flows out from a steam-water mixture outlet B at the upper part of the steam-water mixture sleeve 11-2. During the operation, each sleeve type heat-taking pipe forms a heat transfer unit with an independent water-steam loop. The surplus heat brought by the high-temperature catalyst from the regenerator of the catalytic cracking unit is continuously taken away from the steam-water mixture generated by the sleeve type heat-taking pipe. The heat extractor shown in fig. 1 mainly uses a double pipe heat extraction pipe 11 and a lift air system 33 as shown in fig. 3.

FIG. 4 is a cross-section B-B of FIG. 1, showing an arrangement of the lift air system 33, wherein the air distribution duct 33-1 may be curved if the outer wall 1 of the regenerator has a smaller curvature; fig. 5 is a cross-section of fig. 4, intended to illustrate the arrangement and connection of nozzles on the air distribution duct. FIG. 6 shows two types of nozzles which are commonly used, and other types do not affect the effect of the catalyst. The diameter of the air distribution system pipeline is preferably the standard of the existing pipeline series, and the use effect is not influenced by the non-standard series. Two nozzle sizes are recommended as follows: when the air distribution pipe diameter is DN150, the diameter phi 1 is 34mm, the diameter phi 2 is 10mm, the diameter phi 3 is 14mm, and the diameter phi 4 is 34 mm; when the air distribution pipe diameter is DN80, phi 5 is 12mm, phi 6 is 6mm, the length L1 is 20mm, L2 is 5mm, L3 is 35mm, and L4 is 10 mm. The clearance between the wind lifting system and the lowest point of the heat taking unit is 300-2000 mm. The air distribution pipes can be arranged by one to 10 according to the arrangement row number of the heat taking units.

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 drawings of the present invention, like reference numerals denote like features. In the figures, arrows without reference numbers indicate the flow direction of water, steam-water mixture, fluidized air, flue gas, or catalyst.

The regenerator built-in heat collector of the invention is mainly used for catalytic cracking devices in petrochemical industry and other catalytic cracking devices similar to the technical process, such as MTO (methanol to olefin) devices and HCC (direct cracking of heavy oil to olefin) devices; but also to other heat transfer locations with similar requirements. The heat removal pipe unit of the present invention may be used as a separate heat transfer element, for example, in a heat exchanger similar to the operation of the present invention using an external heat remover.

Claims

1. The utility model provides a built-in heat collector of regenerator, by getting hot tube unit, keep apart the casing, promote the wind system and constitute which characterized in that: the heat extraction pipe unit is arranged in the cavity, and the lifting air system is arranged under the heat extraction pipe unit.

2. The regenerator built-in heat remover according to claim 1, characterized in that: the isolation shell is a metal shell, and a heat-insulation wear-resistant non-metal lining is arranged on the surface of the metal shell.

3. The regenerator built-in heat remover according to claim 1, characterized in that: the left wing and the right wing of the isolation shell are connected with the outer wall of the regenerator.

4. The regenerator built-in heat remover according to claim 1, characterized in that: in practical application, the isolation shell is in a flat-bottom U shape, a convex-bottom U shape, a concave-bottom U shape, or an arc shape concentric with the regenerator wall and an arc shape opposite to the center of a circle.

5. The regenerator built-in heat remover according to claim 1, characterized in that: the length of the isolation shell can completely comprise the heat taking pipe unit in the cavity.

6. The regenerator built-in heat remover according to claim 1, characterized in that: the heat taking pipe units are sleeve type heat taking pipe structures, each sleeve type heat taking pipe is a closed type steam-water circulation structure and is composed of an outer sleeve formed by inserting a water supply pipe into a large pipe, and the water supply pipe and the outer sleeve form a steam-water mixture sleeve together.

7. The regenerator built-in heat remover according to claim 6, characterized in that: the lower end of the outer sleeve is sealed by a welding end socket, the outlet end face of the water supply pipe is not connected with the outer sleeve, and the inner pipe and the outer pipe form a heat transfer unit with an independent water-steam loop.

8. The regenerator built-in heat remover according to claim 6, characterized in that: the height from the end surface of the lower opening of the water supply pipe of the heat taking pipe unit 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.

9. The regenerator built-in heat remover according to claim 6, characterized in that: the outer sleeve end socket is provided with a limiting pipe, the limiting pipe is inserted into the guide frame to maintain the position of the heat taking pipe, and the guide frame is welded on the inner wall of the regenerator.

10. The regenerator built-in heat remover according to claim 6, characterized in that: the steam-water mixture sleeve is divided into a fin type and a light pipe type.

11. The regenerator built-in heat remover according to claim 10, wherein: the outer surface of the sleeve of the light pipe type heat taking unit is not provided with any type of fins, the outer surface of the fin type steam-water mixture sleeve is provided with fins, and the fins are longitudinally arranged along the axial direction of the heat taking pipe.

12. The regenerator built-in heat remover according to claim 1, characterized in that: the distance between the highest point of the air lifting system and the lowest point of the heat taking pipe unit is 300-2000 mm.

13. The regenerator built-in heat remover according to claim 1, characterized in that: the lifting air system is a metal pipeline and consists of a lifting air inlet pipe and an air distribution pipe, the inlet pipe traverses the outer wall of the regenerator and is connected with the air distribution pipe, and a nozzle is arranged in the air distribution pipe.

14. The regenerator built-in heat remover according to claim 13, wherein: the nozzles of the distribution pipeline are arranged in a single row or multiple rows; the direction of the outlet of the nozzle is the same as the flow direction of the circulating catalyst or forms an included angle smaller than 90 degrees with the flow direction of the circulating catalyst, the outlet end of the nozzle is fixed on the air distribution pipe along the radius direction of the air distribution pipe, the diameter size range of the nozzle is 25-300 mm, and the length size range of the nozzle is 30-1000 mm.

15. The regenerator built-in heat remover according to claim 13, wherein: the nominal diameter phi of the air distribution pipe ranges from DN80 to DN1000, and 1 to 10 air distribution pipes can be arranged according to the arrangement of the heat taking units.