Modular steam air preheater

Abstract

The utility model discloses a modular steam air preheater which comprises a shell, a heat exchange tube set, an inlet header and an outlet header, the heat exchange tube set, the inlet header and the outlet header are arranged in the shell, and the shell is composed of four cross beams, four longitudinal beams, four stand columns, a front protection plate, a rear protection plate, a left box cover and a right box cover. The heat exchange tube group comprises a plurality of heat exchange tube bundles; the inlet header and the outlet header are arranged on the left side in the shell up and down; the plurality of heat exchange tube bundles are uniformly supported on a longitudinal beam of the shell at intervals through a left supporting plate and a right supporting plate in sequence from front to back; inlets of the multiple heat exchange tube bundles are connected with the multiple tube connectors of the inlet header in a one-to-one correspondence mode, and outlets of the multiple heat exchange tube bundles are connected with the multiple tube connectors of the outlet header in a one-to-one correspondence mode. The modular steam air preheater replaces an existing tubular air preheater, and is compact in structure, good in heat exchange effect and convenient to install and maintain.

Description

Technical Field

[0001] The utility model relates to a modular steam air preheater, which is suitable for preheating the combustion air of a garbage incinerator and a general boiler, and is also commonly used for eliminating white smoke from the flue gas after desulfurization. Background Art

[0002] In order to improve the combustion efficiency of low calorific value garbage, the combustion air of the garbage incinerator usually needs to be preheated to a certain temperature and then sent into the furnace through a blower. The existing technology is usually a shell-and-tube air preheater. Due to the complex properties of garbage and the corrosiveness of the tail low-temperature flue gas, the shell-and-tube air preheater is very easy to be corroded by the flue gas and perforated and fail. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide a modular steam air preheater to replace the existing shell and tube air preheater, which has a compact structure, good heat exchange effect and convenient installation and maintenance.

[0004] The technical solution to achieve the above object is: a modular steam air preheater, comprising a shell and a heat exchange tube group, an inlet header and an outlet header arranged in the shell, wherein:

[0005] The shell is composed of 4 cross beams, 4 longitudinal beams, 4 columns, a front guard plate, a rear guard plate, a left box cover and a right box cover; the 4 cross beams, 4 longitudinal beams and 4 columns form a rectangular parallelepiped frame; the front and rear faces of the rectangular parallelepiped frame are sealed one by one through the front guard plate and the rear guard plate; the left and right faces of the rectangular parallelepiped frame are sealed one by one through the left box cover and the right box cover; the upper end opening of the rectangular parallelepiped frame is a hot air outlet, and the lower end opening of the rectangular parallelepiped frame is a cold air inlet;

[0006] The heat exchange tube group includes a plurality of heat exchange tube bundles;

[0007] Each heat exchange tube bundle comprises a left support plate, a right support plate and 6 to 20 finned tubes, the left support plate and the right support plate are arranged vertically opposite to each other, the 6 to 20 finned tubes are arranged between the left support plate and the right support plate from top to bottom, all the finned tubes are connected end to end through elbows, one end of the finned tube on the uppermost side forms the inlet of the heat exchange tube bundle, and one end of the finned tube on the lowermost side forms the outlet of the heat exchange tube bundle;

[0008] The inlet header and the outlet header have the same structure, both consisting of a manifold, an end cover and a plurality of pipe joints. The manifold is arranged longitudinally, and the plurality of pipe joints are welded to the manifold in sequence from front to back. The end cover seals an opening at one end of the manifold, and the other end of the manifold is a steam inlet and outlet.

[0009] The inlet header and the outlet header are arranged one above the other on the left side of the housing;

[0010] The plurality of heat exchange tube bundles are uniformly supported on the longitudinal beam of the shell from front to back in sequence through left and right support plates;

[0011] The inlets of the multiple heat exchange tube bundles are connected to the multiple pipe joints of the inlet header in a one-to-one correspondence, and the outlets of the multiple heat exchange tube bundles are connected to the multiple pipe joints of the outlet header in a one-to-one correspondence.

[0012] The above-mentioned modular steam air preheater, wherein the left box cover and the right box cover are respectively provided with inspection doors.

[0013] In the above-mentioned modular steam air preheater, the contact surfaces of the cross beams, longitudinal beams, columns, guard plates and box covers of the shell are all sealed and welded.

[0014] In the above-mentioned modular steam air preheater, a plurality of reinforcing ribs are evenly spaced from left to right on the front guard plate and the rear guard plate.

[0015] In the above-mentioned modular steam air preheater, the number of the heat exchange tube bundles is 10 to 30, and the number of the pipe joints on the inlet header and the outlet header is 10 to 30.

[0016] In the above-mentioned modular steam air preheater, the left and right support plates are respectively provided with 6 to 20 mounting holes for fixing fin tubes, and the left and right ends of each fin tube are respectively inserted into the corresponding mounting holes.

[0017] In the above-mentioned modular steam air preheater, the middle part of each heat exchange tube bundle is fixed by a tube clamp.

[0018] In the above-mentioned modular steam air preheater, a plurality of fixing holes for fixing pipe joints are opened on the collecting pipe, and each pipe joint is welded to a corresponding fixing hole.

[0019] The modular steam air preheater of the utility model replaces the existing tube-in-tube air preheater, has a compact structure, good heat exchange effect, and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the modular steam air preheater of the utility model;

[0021] Figure 2 It is a side view of the modular steam air preheater of the utility model;

[0022] Figure 3It is a top view of the modular steam air preheater of the utility model;

[0023] Figure 4 is the front view of the shell;

[0024] Figure 5 is a top view of the shell;

[0025] Figure 6 It is the structural diagram of a single-piece heat exchange tube bundle;

[0026] Figure 7 This is the structural diagram of the import header;

[0027] Figure 8 Schematic diagram of the connection between the manifold and the pipe joint. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the utility model, the specific implementation method thereof is described in detail below in conjunction with the accompanying drawings:

[0029] See also Figures 1 to 8 The best embodiment of the utility model is a modular steam air preheater, which includes a shell 1 and a heat exchange tube group 2, an inlet header 3 and an outlet header 4 arranged in the shell 1.

[0030] Please see again Figure 4 and Figure 5 The shell 1 is composed of 4 cross beams 11, 4 longitudinal beams 12, 4 columns 13, front guard plate 14, rear guard plate 15, left box cover 16 and right box cover 17; the 4 cross beams 11, 4 longitudinal beams 12 and 4 columns 13 form a rectangular frame; the front and rear sides of the rectangular frame are sealed by the front guard plate 14 and the rear guard plate 15 one by one; the left and right sides of the rectangular frame are sealed by the left box cover 16 and the right box cover 17 one by one, and the left box cover 16 and the right box cover 17 are respectively provided with inspection doors 18; the upper end opening of the rectangular frame is the hot air outlet, and the lower end opening of the rectangular frame is the cold air inlet. The contact surfaces of the cross beams, longitudinal beams, columns, each guard plate and each box cover of the shell 1 are all sealed and welded to ensure that there is no smoke leakage. A number of reinforcing ribs are evenly spaced from left to right on the front guard plate 14 and the rear guard plate 15 , respectively, and the reinforcing ribs are used to ensure that the housing 1 has a certain pressure resistance and does not deform after being heated.

[0031] Please see again Figure 6The heat exchange tube group 2 includes a plurality of heat exchange tube bundles 20; each heat exchange tube bundle 20 includes a left support plate 23, a right support plate 24 and 6 to 20 fin tubes 21, the left support plate 23 and the right support plate 24 are arranged vertically opposite to each other, and the 6 to 20 fin tubes 21 are arranged between the left support plate 23 and the right support plate 24 from top to bottom, and all the fin tubes 21 are connected end to end through an elbow 22, and one end of the fin tube on the uppermost side forms the inlet 26 of the heat exchange tube bundle, and one end of the fin tube on the lowermost side forms the outlet 27 of the heat exchange tube bundle. Specifically, 6 to 20 mounting holes for fixing the fin tubes are respectively provided on the left and right support plates, and the left and right ends of each fin tube 21 are respectively inserted into the corresponding mounting holes, so that all the fin tubes 21 are fixed to form a heat exchange tube bundle as a whole, and the middle part of each heat exchange tube bundle can be fixed by a tube clamp 25 to prevent the fin tube 21 from shaking due to its excessive length.

[0032] Please see again Figure 7 and Figure 8 The inlet header 3 and the outlet header 4 have the same structure, both of which are composed of a manifold 31, an end cover 33 and a plurality of pipe joints 32. The manifold 31 is arranged longitudinally, and the plurality of pipe joints 32 are welded on the manifold 31 in sequence from front to back. Specifically, the manifold 31 is provided with a plurality of fixing holes for fixing the pipe joints, and each pipe joint is welded on a corresponding fixing hole. The end cover 33 blocks an opening at one end of the manifold 31, and the other end of the manifold 31 is opened for steam inlet and outlet.

[0033] The inlet header 3 and the outlet header 4 are arranged one above the other on the left side of the shell 1; the multiple heat exchange tube bundles 20 are uniformly supported on the longitudinal beams of the shell 1 from front to back through left and right support plates; the inlets 26 of the multiple heat exchange tube bundles 20 are connected one by one to the multiple pipe joints 32 of the inlet header 3, and the outlets 27 of the multiple heat exchange tube bundles 20 are connected one by one to the multiple pipe joints of the outlet header 4.

[0034] The number of heat exchange tube bundles 20 is 10 to 30, and the number of pipe joints 32 on the inlet header 3 and the outlet header 4 is 10 to 30. The number of heat exchange tube bundles 20, the number of pipe joints on the inlet header 3 and the number of pipe joints on the outlet header 4 are equal.

[0035] The modular steam-air preheater of the utility model, when in use, hot steam enters the heat exchange tube group 2 from the inlet header 3 and comes out from the outlet header 4; cold air enters the shell from the lower end opening of the shell 1, and then becomes hot air after heat exchange with the hot steam in the heat exchange tube group 2, and comes out from the upper end opening of the shell 1; the hot steam passes through the tube side of the air preheater from top to bottom, and the cold air passes through the shell side of the air preheater from bottom to top, completing the heat exchange.

[0036] In summary, the modular steam air preheater of the utility model replaces the existing shell-and-tube air preheater, has a compact structure, good heat exchange effect, and is easy to install and maintain.

[0037] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A modular steam air preheater, characterized in that: It includes a shell and a heat exchange tube group, an inlet header and an outlet header arranged in the shell, wherein: The shell is composed of 4 cross beams, 4 longitudinal beams, 4 columns, a front guard plate, a rear guard plate, a left box cover and a right box cover; the 4 cross beams, 4 longitudinal beams and 4 columns form a rectangular parallelepiped frame; the front and rear faces of the rectangular parallelepiped frame are sealed one by one through the front guard plate and the rear guard plate; the left and right faces of the rectangular parallelepiped frame are sealed one by one through the left box cover and the right box cover; the upper end opening of the rectangular parallelepiped frame is a hot air outlet, and the lower end opening of the rectangular parallelepiped frame is a cold air inlet; The heat exchange tube group includes a plurality of heat exchange tube bundles; Each heat exchange tube bundle comprises a left support plate, a right support plate and 6 to 20 finned tubes, the left support plate and the right support plate are arranged vertically opposite to each other, the 6 to 20 finned tubes are arranged between the left support plate and the right support plate from top to bottom, all the finned tubes are connected end to end through elbows, one end of the finned tube on the uppermost side forms the inlet of the heat exchange tube bundle, and one end of the finned tube on the lowermost side forms the outlet of the heat exchange tube bundle; The inlet header and the outlet header have the same structure, both consisting of a manifold, an end cover and a plurality of pipe joints. The manifold is arranged longitudinally, and the plurality of pipe joints are welded to the manifold in sequence from front to back. The end cover seals an opening at one end of the manifold, and the other end of the manifold is a steam inlet and outlet. The inlet header and the outlet header are arranged one above the other on the left side of the housing; The plurality of heat exchange tube bundles are uniformly supported on the longitudinal beam of the shell from front to back in sequence through left and right support plates; The inlets of the multiple heat exchange tube bundles are connected to the multiple pipe joints of the inlet header in a one-to-one correspondence, and the outlets of the multiple heat exchange tube bundles are connected to the multiple pipe joints of the outlet header in a one-to-one correspondence.

2. A modular steam air preheater according to claim 1, characterized in that: The left box cover and the right box cover are respectively provided with inspection doors.

3. A modular steam air preheater according to claim 1, characterized in that: The contact surfaces of the cross beams, longitudinal beams, upright posts, guard plates and box covers of the shell are all sealed and welded.

4. A modular steam air preheater according to claim 1, characterized in that: The front guard plate and the rear guard plate are respectively provided with a plurality of reinforcing ribs spaced evenly from left to right.

5. A modular steam air preheater according to claim 1, characterized in that: The number of the heat exchange tube bundles is 10 to 30, and the number of the pipe joints on the inlet header and the outlet header is 10 to 30.

6. A modular steam air preheater according to claim 1, characterized in that: The left and right support plates are respectively provided with 6 to 20 mounting holes for fixing the fin tubes, and the left and right ends of each fin tube are respectively inserted into the corresponding mounting holes.

7. A modular steam air preheater according to claim 1, characterized in that: The middle part of each heat exchange tube bundle is fixed with a tube clamp.

8. A modular steam air preheater according to claim 1, characterized in that: The collecting pipe is provided with a plurality of fixing holes for fixing pipe joints, and each pipe joint is welded to a corresponding fixing hole.

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