Anti-corrosion and anti-dust-deposition enamel tube boiler air preheater

Abstract

The utility model discloses an anti-corrosion and anti-dust-deposition enamel tube boiler air preheater, which relates to the technical field of air preheaters and comprises tube plates which are symmetrically arranged, a plurality of outer enamel heat exchange tubes are uniformly arranged between the tube plates, and anti-abrasion protective tiles are arranged on the outer walls of the outer enamel heat exchange tubes on the uppermost layer and the lowermost layer through hoops. Outer enamel sleeves are arranged between the two ends of the outer enamel heat exchange tube and the tube plate, and sealing pieces are arranged between the outer enamel sleeves and the outer enamel heat exchange tube. The space between the outer enamel heat exchange pipes is increased by changing the transverse pitch between the outer enamel heat exchange pipes, dust can conveniently penetrate through the space between the outer enamel heat exchange pipes, the dust blocking amount is reduced, the self-dust-cleaning capacity of the outer enamel heat exchange pipes is improved, and the air preheater can be used easily; and the sealing element and the high-temperature sealing mud are matched for use, so that the sealing performance between the outer enamel heat exchange tube and the outer enamel sleeve is improved, and the use of the air preheater is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheater technical field especially relates to a kind of anticorrosive and anti-ash enamel tube boiler air preheater. BACKGROUND

[0002] Boiler air preheater is a kind of heat exchange equipment installed in the tail flue of boiler, for heating the air into the boiler combustion system. It recovers the waste heat in flue gas, and the cold air is heated to a certain temperature before being sent into the furnace, so as to improve the thermal efficiency of boiler, reduce fuel consumption, and reduce pollutant emissions. However, the existing air preheater has the problem that the spacing between the outer enamel heat exchange tubes is too small, which causes the fly ash to accumulate between the outer enamel heat exchange tubes, affecting the use of the air preheater. At the same time, there is a gap between the existing outer enamel heat exchange tube and the tube plate, and some corrosive medium penetrates into the connection of the outer enamel heat exchange tube, thereby accelerating the corrosion of the connection of the outer enamel heat exchange tube and reducing the service life of the outer enamel heat exchange tube. SUMMARY

[0003] The utility model discloses a kind of anticorrosive and anti-ash enamel tube boiler air preheater to solve the problem in the background art.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] An anticorrosive and anti-ash enamel tube boiler air preheater, comprising a tube plate symmetrically arranged, a plurality of outer enamel heat exchange tubes are uniformly arranged between the tube plates, and an anti-abrasion tile is arranged on the outer wall of the outer enamel heat exchange tubes at the uppermost layer and the lowermost layer through a clamp, an outer enamel sleeve is arranged between the two ends of the outer enamel heat exchange tube and the tube plate, and a sealing element is arranged between the outer enamel sleeve and the outer enamel heat exchange tube.

[0006] Preferably, the sealing element comprises an annular sealing groove opened on the outer wall of the outer enamel heat exchange tube, an annular sealing gasket is arranged on the inner wall of the outer enamel sleeve and matched with the annular sealing groove, and a high-temperature sealing mud is further arranged on one side of the annular sealing gasket.

[0007] Preferably, the annular sealing groove is composed of an annular groove and a plurality of arc grooves uniformly opened on the bottom surface of the annular groove, and the annular sealing gasket is composed of an annular plate and a plurality of annular rings arranged on the annular plate.

[0008] Preferably, the annular sealing gasket is made of high-temperature-resistant flexible rubber material.

[0009] Preferably, the anti-abrasion tile is composed of an arc-shaped plate and a wear-resistant layer arranged on the outer wall and the inner wall of the arc-shaped plate, and the arc-shaped plate is made of S31603 stainless steel material, and the wear-resistant layer is made of silicon carbide high-molecular wear-resistant composite material.

[0010] Preferably, the transverse pitch between the outer cast heat exchange pipes is 100mm, and the longitudinal pitch is 70mm.

[0011] In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

[0012] The utility model discloses a transverse pitch between outer cast heat exchange pipes is changed to increase the spacing between outer cast heat exchange pipes, facilitate dust to pass through between outer cast heat exchange pipes, reduce the amount of dust blocking, improve the self-cleaning ability of outer cast heat exchange pipes, and be favorable for the use of the air preheater. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A front view structure schematic diagram according to the utility model embodiment is shown.

[0014] Figure 2 The structure schematic diagram of outer cast heat exchange pipe according to the utility model embodiment is shown.

[0015] Figure 3 The cross-sectional view of outer cast heat exchange pipe according to the utility model embodiment is shown.

[0016] Figure 4 For Figure 3 The local enlarged view of A in the middle.

[0017] Figure 5 The structure schematic diagram of anti-abrasion protective cover according to the utility model embodiment is shown.

[0018] Legend:

[0019] 1, tube sheet;2, outer cast sleeve;3, anti-abrasion protective cover;301, wear-resistant layer;302, arc plate;4, clamp;5, outer cast heat exchange pipe;6, annular sealing groove;7, high-temperature sealing mud;8, annular sealing gasket. DETAILED DESCRIPTION

[0020] The technical scheme in the utility model embodiments will be clearly and completely described below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0021] Please refer to Figure 1 - Figure 5 The utility model provides a technical scheme that:

[0022] The utility model provides an anticorrosive and anti-deposited ash enamel tube boiler air preheater, including the symmetrical setting of tube sheet 1, and the flatness after blanking of tube sheet 1 is not more than 2mm per meter, and the flatness of whole tube sheet 1 is not more than 5mm, the difference of the length of two diagonal lines of tube sheet 1 is not more than 4mm, and the material of tube sheet 1 is Q235B, is used to support the outer enamel heat exchange pipe 5, evenly be equipped with a plurality of outer enamel heat exchange pipe 5 between tube sheet 1, and the outer wall of the uppermost layer and the lowermost layer outer enamel heat exchange pipe 5 is equipped with wear -resistant tile 3 through the clamp 4, through the use of wear -resistant tile 3, it is convenient to protect the uppermost or the lowermost outer enamel heat exchange pipe 5, avoid the wear and tear of outer enamel heat exchange pipe 5, to improve the service life of outer enamel heat exchange pipe 5, the transverse pitch between outer enamel heat exchange pipe 5 is 100mm, and the longitudinal pitch is 70mm, increases the spacing between outer enamel heat exchange pipe 5, and it is convenient for dust to pass through between outer enamel heat exchange pipe 5, and the dust blocking amount reduces, improves the self-cleaning ability of outer enamel heat exchange pipe 5, is favorable to the use of air preheater, and outer enamel sleeve pipe 2 is arranged between the both ends of outer enamel heat exchange pipe 5 and tube sheet 1, and one end of outer enamel sleeve pipe 2 and tube sheet 1 are connected through the welding mode, specifically: using A022 electrode or H00Cr119Ni12Mo2ER316L welding wire to carry out the welding connection, improve the firmness of welding spot, sealing element is arranged between outer enamel sleeve pipe 2 and outer enamel heat exchange pipe 5, the sealing property between outer enamel heat exchange pipe 5 and outer enamel sleeve pipe 2 is improved through the use of sealing element, and it is favorable to the use of air preheater.

[0023] In the utility model, sealing element includes annular sealing groove 6 set on the outer wall of outer enamel heat exchange pipe 5, and the inner wall of outer enamel sleeve pipe 2 is equipped with annular sealing pad 8 matched with annular sealing groove 6, realizes first sealing through the mutual use between annular sealing groove 6 and annular sealing pad 8, and annular sealing pad 8 side is also equipped with high temperature sealing mud 7, realizes second sealing, and the sealing property between outer enamel heat exchange pipe 5 and outer enamel sleeve pipe 2 is improved through twice sealing.

[0024] In the utility model, annular sealing groove 6 is composed of annular groove and the plurality of arc grooves evenly set on the bottom surface of annular groove, and annular sealing pad 8 is composed of annular plate and the plurality of annular rings arranged on annular plate, and the contact area between annular sealing pad 8 and annular sealing groove 6 is improved through the mutual use of arc groove and annular ring, so as to improve the sealing property between outer enamel heat exchange pipe 5 and outer enamel sleeve pipe 2.

[0025] In the utility model, annular sealing pad 8 is made of high-temperature-resistant flexible rubber material, which avoids melting of annular sealing pad 8 and improves the service life of annular sealing pad 8.

[0026] In the utility model, the anti-abrasion protective tile 3 is composed of the arc-shaped plate 302 and the wear-resistant layer 301 arranged on the outer wall and the inner wall of the arc-shaped plate 302, the arc-shaped plate 302 is made of S31603 stainless steel material, and the wear-resistant layer 301 is made of silicon carbide high polymer wear-resistant composite material, so that the wear resistance of the anti-abrasion protective tile 3 is improved.

[0027] Working principle: in use, the air preheater is installed in the boiler tail flue, the waste heat in the flue gas is recovered to preheat the air, so that the boiler efficiency is improved, the fuel consumption is reduced, and the emission is reduced; specifically: the heat in the flue gas is recovered by using each outer enamel heat exchange pipe 5; wherein, by using the anti-abrasion protective tile 3, the enamel heat exchange pipe 5 is prevented from being corroded, so that the service life of the outer enamel heat exchange pipe 5 is improved.

[0028] The above description of the embodiments enables those skilled in the art to implement or use the utility model. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air preheater for a corrosion-resistant and ash-resistant enamel-lined tube boiler, comprising symmetrically arranged tube sheets (1), characterized in that, Multiple external enamel heat exchange tubes (5) are evenly arranged between the tube sheet (1), and the outer walls of the uppermost and lowermost external enamel heat exchange tubes (5) are provided with anti-wear protective tiles (3) by clamps (4). External enamel sleeves (2) are provided between the two ends of the external enamel heat exchange tubes (5) and the tube sheet (1), and a sealing element is provided between the external enamel sleeves (2) and the external enamel heat exchange tubes (5).

2. The anti-corrosion and anti-ash-accumulation enamel tube boiler air preheater according to claim 1, characterized in that, The sealing element includes an annular sealing groove (6) formed on the outer wall of the outer enamel heat exchange tube (5), and an annular sealing gasket (8) that matches the annular sealing groove (6) is provided on the inner wall of the outer enamel sleeve (2). A high-temperature sealing mud (7) is also provided on one side of the annular sealing gasket (8).

3. The anti-corrosion and anti-ash-accumulation enamel tube boiler air preheater according to claim 2, characterized in that, The annular sealing groove (6) is composed of an annular groove and multiple arc-shaped grooves evenly opened on the bottom surface of the annular groove, and the annular sealing gasket (8) is composed of an annular plate and multiple annular rings set on the annular plate.

4. The anti-corrosion and anti-ash-accumulation enamel tube boiler air preheater according to claim 3, characterized in that, The annular sealing gasket (8) is made of high-temperature resistant flexible rubber material.

5. The anti-corrosion and anti-ash-accumulation enamel tube boiler air preheater according to claim 1, characterized in that, The wear-resistant protective tile (3) is composed of an arc-shaped plate (302) and a wear-resistant layer (301) disposed on the outer and inner walls of the arc-shaped plate (302). The arc-shaped plate (302) is made of S31603 stainless steel, and the wear-resistant layer (301) is made of silicon carbide polymer wear-resistant composite material.

6. The anti-corrosion and anti-ash-accumulation enamel tube boiler air preheater according to claim 1, characterized in that, The transverse pitch between the external enamel heat exchange tubes (5) is 100 mm, and the longitudinal pitch is 70 mm.

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