CN111457778A

CN111457778A - Spiral baffle plate for shell-and-tube heat exchanger

Info

Publication number: CN111457778A
Application number: CN202010499868.6A
Authority: CN
Inventors: 唐柳华; 李龙; 张�荣
Original assignee: Wuhan Pe&ce Science And Technology Co ltd
Current assignee: Wuhan Pe&ce Science And Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2020-07-28

Abstract

A spiral baffle plate for a shell-and-tube heat exchanger comprises spiral plates, tube holes and spiral lines; the method is characterized in that: the normal direction from the internal diameter to the external diameter of the spiral plate is a whole plate, one or more spiral plates form a spiral baffle plate, the external diameter of the spiral plate is between 100-2000 mm, the thickness is between 2-30 mm, and the diameter of the pipe hole is not less than 10mm and not more than 57 mm.

Description

Spiral baffle plate for shell-and-tube heat exchanger

Technical Field

The invention relates to a spiral baffle plate for a shell-and-tube heat exchanger, belonging to the field of chemical equipment.

Background

The arch and disc-ring baffle plate is the most commonly used baffle plate in a shell-and-tube heat exchanger, has simple forming and easy opening, but is gradually replaced by a spiral baffle plate in recent years due to the defects of large shell-side pressure drop, dead flow zone, easy scaling, heat transfer efficiency and the like. The spiral baffle plate can be divided into a continuous spiral baffle plate and a discontinuous spiral baffle plate, and the difference is that the continuous spiral baffle plate is a standard spiral curved surface, and the discontinuous spiral baffle plate is generally formed by connecting a plurality of 1/4 fan-shaped plane plates instead of curved surfaces alternately to form an approximate spiral plane forming a certain angle with a main axis. No matter the continuous spiral baffle plate or the discontinuous spiral baffle plate, the problem of how to form a closed continuous spiral channel exists so as to solve the phenomenon of central leakage of the baffle plate.

The patent number Z L2005100430335 discloses a shell-and-tube heat exchanger with continuous spiral baffle plates, and indirectly discloses a continuous spiral baffle plate, wherein the continuous spiral baffle plate (7) is formed by overlapping a plurality of periodic spiral plates, each periodic spiral plate is raised by a screw pitch along the direction of a central shaft, the spiral plates are connected end to form a continuous spiral surface, or the continuous spiral baffle plate (7) adopts a structure of a spliced continuous spiral baffle plate (23), the spliced continuous spiral baffle plate (23) is formed by splicing an inner continuous spiral baffle plate (21) and an outer continuous spiral baffle plate (22), "the inner spiral line of the continuous spiral baffle plate (7) is fixed on a central tube (6), the continuous spiral baffle plate (7) and a shell (8) surround and form a closed continuous spiral channel". A hole is reserved in the middle of the continuous spiral baffle plate to install the central tube, the heat exchange area is lost, and the first processing method is not enough to be poor in adaptability of a punching die and cannot meet the processing of various specifications of the baffle plates, and the second processing method is not enough to realize the processing precision difference and the slow industrial production.

Disclosure of Invention

The invention aims to solve the technical problem of providing a spiral baffle plate for a shell-and-tube heat exchanger with an extremely small central hole diameter, wherein a plurality of spiral plates are combined into a closed flow channel continuous spiral baffle plate. The invention has the advantages of small center hole of the spiral baffle plate, simple processing procedure, high precision and high speed, and is suitable for industrial production. The technical scheme for solving the technical problem is as follows: a spiral baffle plate for a shell-and-tube heat exchanger comprises a spiral plate 1, a tube hole 2 and a spiral line 3; the method is characterized in that: the normal direction of the single spiral plate 1 from the inner diameter to the outer diameter is a whole plate, and one or more spiral plates 1 form a spiral baffle plate. The spiral plate 1 is made of carbon steel, stainless steel, nonferrous metal or nonmetal. The spiral sheet 1 can be processed with a pull rod hole 4 or not processed with the pull rod hole 4. The diameter of the pipe hole 2 is not less than 10mm and not more than 57mm, the diameter deviation of the pipe hole 2 is not more than 1mm, and the axis of the pipe hole 2 is parallel to the spiral rotation axis of the spiral plate piece 1. Most adjacent tube holes 2 are spaced less than twice the diameter of the tube holes 2. The spiral plate 1 has an outer diameter of 100-2000 mm and a thickness of 2-30 mm. The helix 3 tends to be straight, the diameter of the helix 3 being less than 1/2 of the pitch value. The spiral rotation angle of the spiral plate 1 is larger than 90 degrees but not more than 360 degrees, and the normal thickness difference between any two points is not more than 20%. The processing process of the spiral plate 1 is that a circular ring plate is used for manufacturing a base plate of the spiral plate 1, and then a pipe hole 2 is processed on the base plate. Or the semi-finished product or the finished product of the spiral plate piece 1 is formed by adopting a casting method, and the spiral rotation angle of the spiral plate piece 2 is not limited by adopting the casting method.

Drawings

Fig. 1 is a side view of a spiral sheet.

Fig. 2 is an elevation view of a spiral sheet.

FIG. 3 is a schematic view of a helical baffle.

Reference numerals: 1-spiral sheet, 2-pipe hole, 3-spiral line and 4-pull rod hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The method comprises the steps of determining the outer diameter and the inner diameter of a spiral plate according to spiral parameters of a spiral baffle plate, cutting a raw material plate to a circular ring plate meeting the size requirement of the spiral plate by cutting equipment such as spark cutting, laser cutting, toothless saw cutting, high-pressure water jet cutting, plasma cutting and the like, and cutting or cutting off a small fan shape along a certain radius line to enable the central angle of the residual circular ring plate to be 90-360 degrees. The raw material plate is a plate with or without a welding seam, the cut circular ring plate is placed on a forming device to process the spiral plate substrate, and the normal direction from the inner diameter to the outer diameter of the single spiral plate substrate is ensured to be a whole plate. And processing the pipe hole after the substrate is processed. The spiral substrate to be processed and formed is fixed on the perforating device, and the processing of the pipe holes can be finished one by using hole processing modes such as drilling, cutting, milling, cutting, punching and the like, the preferred mode is laser cutting perforation, the automation degree is high, and the positioning size and the outline size precision of the holes are high. Regardless of the processing method, the hole opening direction is always parallel to the spiral rotating shaft direction of the spiral plate. After finishing the processing of all the pipe holes, a single-block pitch baffle plate is obtained. And finally, splicing a plurality of single spiral baffle plates according to the requirement to obtain a complete spiral baffle plate. If the casting technique and efficiency are improved, the semifinished or finished product of the spiral sheet can also be formed by casting.

Claims

1. A spiral baffle plate for a shell-and-tube heat exchanger comprises spiral plates (1), tube holes (2) and spiral lines (3); the method is characterized in that: the normal direction from the inner diameter to the outer diameter of the spiral plate (1) is a whole plate, and one or more spiral plates (1) form a spiral baffle plate.

2. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the spiral plate (1) is made of carbon steel, stainless steel, nonferrous metal or nonmetal.

3. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the spiral sheet (1) can be processed with a pull rod hole (4) or not processed with the pull rod hole (4).

4. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the diameter of the pipe hole (2) is not less than 10mm and not more than 57mm, and the diameter deviation of the pipe hole (2) is not more than 1 mm.

5. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the axis of the pipe hole (2) is parallel to the rotation axis of the spiral plate (1).

6. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: most of the centers of the adjacent pipe holes (2) are spaced less than twice the diameter of the pipe holes (2).

7. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the spiral plate (1) has an outer diameter of 100-2000 mm and a thickness of 2-30 mm.

8. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the helix (3) tends to be straight, the diameter of the helix (3) being less than 1/2 of the pitch value.

9. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the spiral rotation angle of the spiral plate (1) is larger than 90 degrees but not more than 360 degrees, and the normal thickness difference between any two points is not more than 20%.

10. A spiral baffle for a shell and tube heat exchanger as set forth in claim 1, wherein: the spiral plate (1) is processed by firstly manufacturing a base plate of the spiral plate (1) by using a circular ring plate and then processing a pipe hole (2) on the base plate, or a semi-finished product or a finished product of the spiral plate (1) is formed by adopting a casting method.