CN217083418U

CN217083418U - Stepped spiral baffle air preheater

Info

Publication number: CN217083418U
Application number: CN202220398449.8U
Authority: CN
Inventors: 刘汝刚; 吕宏霞; 张龙龙
Original assignee: Doright Co ltd
Current assignee: Doright Co ltd
Priority date: 2022-02-26
Filing date: 2022-02-26
Publication date: 2022-07-29
Anticipated expiration: 2032-02-26

Abstract

The utility model discloses a cascaded spiral baffling board air heater through the improvement to the distribution of pre-heater baffling board, has provided a cascaded spiral baffling board air heater, has overcome the problem that bow-shaped baffling board exists promptly, can reach the heat transfer effect of spiral baffling board again, the utility model discloses a: the heat exchanger comprises a shell 1, a central pipe 2, a baffle plate III 3, a baffle plate II 4, an upper tube plate 5, a baffle plate I6, a baffle plate IV 7, a lower tube plate I8, a lower tube plate II 9 and a heat exchange pipe 10. The spiral baffle plates distributed in a stepped manner of the air preheater do not have air flow dead zones, and the problems that the spiral baffle plates are difficult to process, high in manufacturing cost, long in manufacturing period, difficult to assemble and the like are solved.

Description

Stepped spiral baffle air preheater

Technical Field

The utility model relates to a vertical shell and tube type air heater (hereinafter referred to as preheater) of carbon black trade.

Background

For many years, the air preheater for the carbon black industry is used for heating air by heat exchange of carbon black tail gas generated in the reaction process and then returning the carbon black tail gas to a reaction furnace for supporting combustion, so that the aim of saving energy is fulfilled. The preheater always adopts the opposite distribution of the arched baffles, and the air flow transversely passes through the tube bundle and then flows to the lower baffle from the arched gap, which has the problems: large pressure drop on the shell side, insufficient heat exchange due to the existence of dead zones in the flowing air, easy occurrence of leakage flow and bypass flow, easy generation of vibration due to the transverse impact of the flowing air on the tube bundle, and shortened service life of the preheater. Therefore, the air preheater with the stepped spiral baffle plates is provided, the problems of the arc baffle plates are solved, and the heat exchange effect of the spiral baffle plates can be achieved.

Disclosure of Invention

The utility model discloses aim at designing cascaded spiral baffling board air heater, the technical scheme that this preheater took is:

a stepped spiral baffle air preheater comprising: casing 1, center tube 2, baffling board III 3, baffling board II 4, go up tube sheet 5, baffling board I6, baffling board IV 7, lower tube sheet I8, lower tube sheet II 9, heat exchange tube 10, its characterized in that: a central pipe (2) with a plurality of air outlets and a closed top is arranged on one pipe wall in the tube bundle of the preheater; the central tube (2) is welded on the lower tube plate I (8) and is communicated with a space formed by the lower tube plate I (8), the lower tube plate II (9) and a section of short section; the height of the central pipe (2) reaches the position of the baffle plate I (6); the baffle plates are fan-shaped and are distributed in a step-shaped spiral shape around the central pipe (2); the upper baffle plate and the lower baffle plate are partially overlapped, namely the intersecting projections of the baffle plate I (6) and the baffle plate II (4), the baffle plate II (4) and the baffle plate III (3), the baffle plate III (3) and the baffle plate IV (7) are partially overlapped, so that air leakage and backflow are prevented; the cold air inlet A enters the shell (1) tangentially, and the hot air outlet B flows out of the shell (1) tangentially, so that the air flow spirally flows along the stepped baffle plate.

The design points of the utility model are:

1. the baffle plates are in a fan shape slightly larger than the inner diameter of the 1/4 shell (1) and are distributed around the central pipe (2) in a stepped spiral manner;

2. cold air enters the shell (1) from the cold air inlet (A) in a tangential mode, and hot air flows out of the shell (1) from the hot air outlet (B) in a tangential mode;

3. a strand of cold air is introduced into the double lower tube plates from the cooling air inlet (h), enters the shell (1) from the air outlet on the central tube (2), and is converged with the process gas to participate in heat exchange.

The utility model has the advantages that:

1. the spiral baffle plates distributed in a step manner do not have air flow dead zones, so that the heat efficiency is high;

2. the problems of difficult processing, high manufacturing cost, long manufacturing period, difficult assembly and the like of the spiral baffle plate are solved;

3. the tangentially entering cold air flows along a spiral track of baffle plates arranged in a step;

4. a cooling air flow led out from the cold air inlet enters the central tube and then enters the shell to participate in heat exchange, and the process air is not lost;

5. the vibration of the preheater is reduced, and the service life of the preheater is prolonged.

Drawings

FIG. 1 is a schematic view of a stepped spiral baffle air preheater of the present invention

FIG. 2 is a view of FIG. 1a-a

FIG. 3 is a view of FIGS. 1b-b

FIG. 4 is a view from C to C of FIG. 1

FIG. 5 is a view from D to d in FIG. 1

FIG. 6 is a view from FIG. 1e to e

The labels in the figure are: 1-shell, 2-central tube, 3-baffle plate III, 4-baffle plate II, 5-upper tube plate, 6-baffle plate I, 7-baffle plate IV,

8-lower tube plate I, 9-lower tube plate II and 10-heat exchange tubes.

A-cold air inlet, B-hot air outlet and h-cooling air inlet.

Detailed Description

A stepped spiral baffle air preheater comprising: the heat exchange tube comprises a shell 1, a central tube 2, a baffle plate III 3, a baffle plate II 4, an upper tube plate 5, a baffle plate I6, a baffle plate IV 9, a lower tube plate I8, a lower tube plate II 9 and a heat exchange tube 10.

The specific implementation process comprises the following steps:

1. manufacturing a baffle plate: the projection area of each baffle plate is larger than the 1/4 projection area of the inner diameter of the shell 1, and the number of the baffles is designed;

2. manufacturing a central tube: the diameter of the central tube 2 is larger than that of the heat exchange tube, the length of the central tube is from a lower tube plate I8 to a first baffle plate I6 at a cold air inlet A, an air outlet is formed in the central tube 2 according to the designed size and position, and a top outlet is sealed by a blocking plate;

3. processing a tube plate: the diameter of a hole formed in the middle of the lower tube plate I8 is slightly larger than the outer diameter of the central tube 2, and the upper tube plate 5 and the lower tube plate II 9 do not have the hole of the central tube 2;

4. shell pass assembly welding: blanking according to the drawing, processing each interface flange, and then assembling and welding to form a shell assembly;

5. assembling and welding a tube pass:

1) a vertical pipe system: the upper tube plate 5, the baffle plate and the fixed tube form a tube system;

2) the lower tube plate I8 is welded with the short joint, the cooling air connecting tube and the central tube 2 and then penetrates through the heat exchange tube 10;

3) assembling and welding a lower tube plate II 9, a short section and a lower flange;

4) the lower tube plate II 9 is welded with a short section at the cooling air connecting tube;

5) the heat exchange tube 10 is welded with a lower tube plate II 9;

6. assembling: the shell pass and the tube pass are assembled, and the heat exchange tube 10 is welded with the upper tube plate 5 through the single tube compensator;

7. and (4) checking: the size and the direction of the pipe orifice of each part meet the requirements of the pattern.

Claims

1. A stepped spiral baffle air preheater comprising: casing (1), center tube (2), baffling board III (3), baffling board II (4), go up tube sheet (5), baffling board I (6), baffling board IV (7), lower tube sheet I (8), lower tube sheet II (9), heat exchange tube (10), its characterized in that: the tube bundle of the preheater is provided with a central tube (2) of which the wall is provided with a plurality of air outlets and the top is closed; the baffle plates are fan-shaped and are distributed in a step-shaped spiral shape around the central pipe (2); the cold air inlet A enters the shell (1) tangentially, and the hot air outlet B flows out of the shell (1) tangentially, so that the air flow spirally flows along the stepped baffle plate.

2. A stepped, spiral baffle air preheater according to claim 1, wherein: the central tube (2) is welded on the lower tube plate I (8) and is communicated with a space formed by the lower tube plate I (8), the lower tube plate II (9) and a section of short section; the height of the central pipe (2) reaches the position of the baffle plate I (6).

3. A stepped, spiral baffle air preheater according to claim 1, wherein: the upper baffle plate and the lower baffle plate are partially overlapped, namely the intersecting projections of the baffle plate I (6) and the baffle plate II (4), the baffle plate II (4) and the baffle plate III (3), the baffle plate III (3) and the baffle plate IV (7) are partially overlapped, so that air leakage and backflow are prevented.