CN216282961U - Air preheating device containing sulfur dioxide flue gas - Google Patents

Abstract

The utility model discloses an air preheating device for sulfur dioxide-containing flue gas, which comprises a shell, wherein a first channel box and a second channel box are arranged at two ends of the shell, the first channel box is arranged at the upper end of the shell, the second channel box is arranged at the lower end of the shell, a heat exchange tube is arranged between the first channel box and the second channel box, and the heat exchange tube is vertically arranged in the shell; a shell air inlet and a shell air outlet are arranged on the peripheral wall of the shell, the shell air inlet is positioned at the lower part of the shell, and the shell air outlet is positioned at the upper part of the shell; the sulfur dioxide flue gas enters from the first channel box and flows out from the second channel box through the heat exchange tube; air enters from the shell layer air inlet and flows out from the shell layer air outlet through a cavity between the heat exchange tube and the inner peripheral wall of the shell body, so that the air is preheated.

Description

Air preheating device containing sulfur dioxide flue gas

Technical Field

The utility model belongs to the field of chemical equipment, and relates to an air preheating device for sulfur dioxide-containing flue gas.

Background

In chemical equipment, a fin heat exchanger is usually adopted, sulfur dioxide flue gas is used for preheating air, and heat in the flue gas is recovered.

The finned heat exchanger has large pressure drop and high system power operation cost, sulfur dioxide in the flue gas contains a large amount of water vapor and dust, the requirement on the material of the heat exchange tube is high, the investment cost is high, and the heat recovery of the sulfur dioxide flue gas is not facilitated.

Therefore, it is needed to design an air preheating device for sulfur dioxide-containing flue gas to solve the technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve at least part of technical problems in the prior art to a certain extent, and provides the air preheating device containing the sulfur dioxide flue gas, which has a reasonable structure and is convenient to use, abandons the traditional expensive stainless steel pipe and the fin form with a complex structure, reduces the pressure within 1kPa, reduces the operating cost and saves the operating cost.

In order to solve the technical problems, the air preheating device for sulfur dioxide-containing flue gas provided by the utility model comprises a shell, wherein a first channel box and a second channel box are arranged at two ends of the shell, the first channel box is arranged at the upper end of the shell, the second channel box is arranged at the lower end of the shell, a heat exchange tube is arranged between the first channel box and the second channel box, and the heat exchange tube is vertically arranged in the shell; a shell air inlet and a shell air outlet are arranged on the peripheral wall of the shell, the shell air inlet is positioned at the lower part of the shell, and the shell air outlet is positioned at the upper part of the shell; the sulfur dioxide flue gas enters from the first channel box and flows out from the second channel box through the heat exchange tube; air enters from the shell layer air inlet and flows out from the shell layer air outlet through a cavity between the heat exchange tube and the inner peripheral wall of the shell body so as to preheat the air; the heat exchange tube is an aluminum-impregnated steel tube, and the diameter of the heat exchange tube is not less than 40 mm.

In a preferred embodiment, the housing is provided with a first baffle plate inside, which is of an annular structure.

As a preferred embodiment, the seal heads at the two ends of the first channel box and the second channel box are flat seal heads which are non-detachable seal heads.

As a preferred embodiment, the inlet and outlet pipelines of the shell layer are provided with circular diversion holes, and the diversion holes are provided with a first pipe box manhole and a second pipe box manhole.

As a preferred embodiment, a rectangular vent hole is provided on the housing, and a person can enter the rectangular vent hole through the first channel manhole or the second channel manhole.

As a preferred embodiment, the rectangular vent holes are arranged close to the tube sheet.

The utility model has the beneficial effects that:

the air preheating device for the sulfur dioxide-containing flue gas, provided by the utility model, is reasonable in structure and convenient to use, and abandons the traditional expensive stainless steel pipe and the fin form with a complex structure, so that the pressure is reduced within 1kPa, the operation cost is reduced, and the operation cost is saved.

Drawings

The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the utility model and in which:

FIG. 1 is a schematic structural diagram of an air preheating device for sulfur dioxide-containing flue gas according to the present invention;

FIG. 2 is an enlarged fragmentary view in phantom in the corresponding air preheater of FIG. 1;

FIG. 3 is a schematic view of a rectangular vent according to the present invention.

In the drawings, the reference numerals denote the following components:

10. a housing;

11. a first header; 11a tube layer air inlet; 11b. a first pipe box manhole;

12. a second header; 12a, pipe layer air outlet; 12b. a second pipe box manhole;

13. a shell layer air inlet;

14. a shell layer air outlet;

15. a rectangular vent hole;

20. a heat exchange pipe;

30. a first baffle plate;

40. and the second baffle plate.

Detailed Description

Fig. 1 to 3 are related schematic views of an air preheater for flue gas containing sulfur dioxide according to the present application, and the present invention will be described in detail below with reference to the following specific examples and accompanying drawings.

The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the utility model. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the utility model. Like reference numerals are used to denote like parts.

The structure of the air preheating device for the flue gas containing sulfur dioxide is schematically shown in fig. 1 to 2. The utility model provides an air preheating device who contains sulfur dioxide flue gas includes casing 10, the both ends of casing 10 are disposed first pipe case 11 and second pipe case 12, first pipe case 11 dispose in the upper end of casing 10, second pipe case 12 set up in the lower extreme of casing 10, dispose heat exchange tube 20 between first pipe case 11 and the second pipe case 12, first baffle 30 is vertical to be set up in the inside of casing 10.

Further, the outer peripheral wall of the casing 10 is provided with a shell air inlet 13 and a shell air outlet 14, as shown in fig. 1, the shell air inlet 13 is located at the lower part of the casing 10, and the shell air outlet 14 is located at the upper part of the casing 10; the sulfur dioxide flue gas enters from the first channel 11 and flows out from the second channel 12 through the heat exchange tube 20; air enters from the guide shell and flows out from the shell air outlet 14 through a chamber between the heat exchange tube 20 and the inner peripheral wall of the shell 10, so that the air is preheated. It is understood that the number of the heat exchange tubes 20 is plural, and only a partial number of one sectional view is shown in fig. 1.

As an embodiment of the present invention, the first tube box 11 is configured with a tube layer inlet 11a, the second tube box 12 is configured with a tube layer outlet 12a, the sulfur dioxide flue gas enters from the tube layer inlet 11a of the first tube box 11, and the sulfur dioxide flue gas flows out from the tube layer outlet 12a of the second tube box 12.

Further, the first pipe box 11 is further provided with a first pipe box manhole 11b, which is arranged opposite to the air inlet 11 a; the second pipe box 12 is provided with a second pipe box manhole 12b, which is disposed opposite to the pipe layer outlet port 12a.

The shell air inlet 13 and the shell air outlet 14 of the feeding pipe are arranged perpendicular to the axial direction of the shell 10, rectangular vent holes 15 are arranged at the boundary of the shell air inlet 13 and the shell 10, and the rectangular vent holes 15 are arranged at the boundary of the shell air outlet 14 and the shell 10; the rectangular vent hole 15 is a rectangular hole, and as shown in fig. 3, it is disposed to penetrate the wall of the housing 10.

Further, the rectangular ventilation holes 15 are provided near the end of the casing 10 to increase the flow path of air in the casing 10 as much as possible, thereby performing sufficient heat exchange.

In the embodiment shown in fig. 1, a first baffle 30 and a second baffle 40 are disposed inside the housing 10 and spaced apart from each other along the length of the housing 10. In a preferred embodiment, the distance between the first baffle plate 30 and the second baffle plate 40 is 300mm to 800 mm. The structure form of the utility model solves the problem of difficult dust removal of the finned tube heat exchanger, improves the convenience of cleaning and has good popularization value.

Further, the first baffle 30 is an annular plate, and the outer edge of the annular plate abuts against the inner peripheral wall of the housing 10; the second baffle 40 is a circular plate concentrically disposed inside the housing 10.

In one aspect of the present embodiment, the heat exchange pipe 20 is a steel pipe and is disposed through the through holes of the first baffle 30 and the second baffle 40. The through holes are uniformly formed on the surfaces of the first baffle 30 and the second baffle 40. The outer peripheral wall of the heat exchange tube 20 is provided with an aluminized coating. Preferably, the thickness of the aluminized coating is 0.1 to 1mm, so as to enhance the corrosion resistance of the heat exchange tube 20 and prolong the service life of the air preheater device.

Further, the end sockets of the first channel box 11 and the second channel box 12 are flat end sockets; a heat exchange tube 20 is arranged in the heat exchanger shell, the heat exchange tube is made of 20# steel tube and is soaked in aluminum, and a gap flow channel between the heat exchange tube and the heat exchange tube in the shell 10 is a shell layer; the flow channels in the tube boxes and the heat exchange tube bundles on the two sides are tube layers; a first round-notch baffle 30 is arranged in the heat exchanger; the shell layer and the tube layer are both provided with a feed pipe and a discharge pipe; sulfur dioxide flue gas enters from one end of the pipe box and flows out from the pipe box head at the other side through the heat exchange pipe; air enters from a feeding pipe at one end of the shell and flows out from a discharging pipe at the other end of the shell of the heat exchanger; the shell layer feed and discharge port is provided with a guide cylinder, a strip-shaped vent hole is arranged in the guide cylinder, and the vent hole is close to the tube plate; the preheating of the air is achieved by means of a complete counterflow.

As another embodiment of the present invention, the air preheating device shown in fig. 1 may be arranged in series to extend the length of air preheating and improve the utilization rate of the heat of the sulfur dioxide flue gas.

Compared with the defects and shortcomings of the prior art, the air preheating device containing the sulfur dioxide flue gas provided by the utility model is reasonable in structure and convenient to use, and the traditional expensive stainless steel pipe and the fin form with a complex structure are abandoned, so that the pressure is reduced within 1kPa, the operation cost is reduced, and the operation cost is saved.

The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.

Claims (6)

1. The air preheating device for the sulfur dioxide-containing flue gas is characterized by comprising a shell, wherein a first channel box and a second channel box are arranged at two ends of the shell, the first channel box is arranged at the upper end of the shell, the second channel box is arranged at the lower end of the shell, a heat exchange tube is arranged between the first channel box and the second channel box, and the heat exchange tube is vertically arranged in the shell; a shell air inlet and a shell air outlet are arranged on the peripheral wall of the shell, the shell air inlet is positioned at the lower part of the shell, and the shell air outlet is positioned at the upper part of the shell; the sulfur dioxide flue gas enters from the first channel box and flows out from the second channel box through the heat exchange tube; air enters from the shell layer air inlet and flows out from the shell layer air outlet through a cavity between the heat exchange tube and the inner peripheral wall of the shell body so as to preheat the air; the heat exchange tube is an aluminum-impregnated steel tube, and the diameter of the heat exchange tube is not less than 40 mm.

2. The air preheater of claim 1, wherein the interior of the housing is provided with a first baffle plate having an annular configuration.

3. The air preheating device according to claim 2, wherein the end sockets at the two ends of the first channel and the second channel are flat end sockets, and the flat end sockets are non-detachable end sockets.

4. The air preheating device according to claim 1, wherein the inlet and outlet pipelines of the shell layer are provided with circular diversion holes, and the diversion holes are provided with a first pipe box manhole and a second pipe box manhole.

5. The air preheating device according to claim 4, wherein a rectangular vent hole is provided on the housing, and a person can enter the rectangular vent hole through the first or second channel manhole.

6. The air preheater of claim 5, wherein the rectangular vent holes are disposed proximate to the tube sheet.

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