Removable sealing structure of non-metallic plate air preheater

Abstract

The present invention relates to a detachable sealing structure of a non-metallic plate-type air preheater, comprising a non-metallic heat exchange plate group, the ends of which are sleeved with a metal tube sheet and a sealing strip in sequence, the outer end surface of the sealing strip is provided with a boss, the boss is sleeved with a pressure plate, the pressure plate is pressed and fixed with the metal tube sheet by screws, and the non-metallic heat exchange plate group is provided with a plurality of non-metallic heat exchange units. The present invention is detachable and has good sealing performance, is light in weight, has strong corrosion resistance, is easy to clean, is not easy to accumulate dust, and is easy to repair.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum refining, and in particular to a detachable sealing structure of a non-metallic plate type air preheater, which is used for waste heat recovery of a heating furnace in the petroleum refining industry. Background Art

[0002] At present, the plate air preheaters used in the flue gas waste heat recovery system of the domestic petroleum refining industry are generally metal type. Metal plate air preheaters have a wide range of applications, simple structures, and mature manufacturing technology, but metal plate air preheaters are heavy, have poor low-temperature dew point corrosion resistance, and have serious dust accumulation in the low-temperature section. Metal heat exchange components are usually welded, and users cannot perform rapid inspection and maintenance on site. At the same time, due to the increasingly high requirements for energy conservation and emission reduction, obtaining lower exhaust temperatures to achieve higher thermal efficiency will inevitably lead to equipment corrosion, so it is necessary to find a more suitable air preheater to solve such problems. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a detachable sealing structure of a non-metallic plate air preheater, which is detachable and has good sealing performance, is light in weight, has strong corrosion resistance, is easy to clean, is not prone to dust accumulation, and is easy to maintain.

[0004] The object of the present invention is achieved in that:

[0005] A detachable sealing structure of a non-metallic plate type air preheater comprises a non-metallic heat exchange plate group, the ends of which are sequentially sleeved on a metal tube sheet and a sealing strip, the outer end surface of the sealing strip is provided with a boss, the boss is sleeved on a pressure plate, the pressure plate is pressed and fixed to the metal tube sheet by screws, and the non-metallic heat exchange plate group is provided with a plurality of non-metallic heat exchange units.

[0006] Preferably, each non-metallic heat exchange unit includes metal support bars symmetrically arranged vertically and non-metallic plates symmetrically arranged horizontally. The metal support bars and the non-metallic plates are connected to form an annular channel, and the ends of the non-metallic plates are fixed to the metal support bars by high-temperature glue.

[0007] Preferably, the cross-section of the metal support bar is circular, and the end of the metal support bar corresponding to the non-metal plate is symmetrically provided with an L-shaped notch, and the L-shaped notch divides the metal support bar into an internal support structure and an external semicircular structure.

[0008] Preferably, the boss is provided with a boss hole corresponding to the non-metallic heat exchange unit, and the hole wall of the boss hole is provided with a serrated protrusion.

[0009] Preferably, both inner and outer end surfaces of the sealing strip are provided with convex ribs, and the inner end surface of the pressure plate is pressed tightly against the outer end surface of the sealing strip.

[0010] Preferably, a PTFE support rod is provided between two adjacent non-metallic heat exchange units, and the length direction of the PTFE support rod is the same as the direction of the flue gas flow.

[0011] Preferably, a non-metallic support bar is provided inside the port of each non-metallic heat exchange unit.

[0012] Preferably, the non-metallic support bar includes a short support bar and a long support bar, wherein two short support bars are provided and are symmetrically arranged at the center of the end of the non-metallic heat exchange unit, and the long support bar is consistent with the length of the non-metallic heat exchange unit, wherein two long support bars are provided and are symmetrically arranged on the upper and lower sides of the short support bar.

[0013] The beneficial effects of the present invention are:

[0014] The invention is detachable and has good sealing performance, is light in weight, has strong corrosion resistance, is easy to clean, is not prone to dust accumulation, and is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 for Figure 1 Top view of the .

[0017] Figure 3 for Figure 1 Left view of .

[0018] Figure 4 for Figure 2 A partial enlarged view of .

[0019] Figure 5 It is a schematic diagram of the structure of the sealing strip.

[0020] Figure 6 for Figure 5 sectional view of .

[0021] Figure 7 for Figure 6 A partial enlarged view of .

[0022] Figure 8 It is a structural schematic diagram of the pressure plate.

[0023] Fig. 9 It is a cross-sectional schematic diagram of a non-metallic heat exchange unit.

[0024] Fig.10 Schematic diagram of the structure of the metal support bar.

[0025] Fig.11 This is a force diagram of the non-metallic heat exchange unit.

[0026] Wherein: non-metallic heat exchange unit 1; metal support bar 1.1; L-shaped notch 1.1.1; support structure 1.1.2; semicircular structure 1.1.3; non-metallic plate 1.2; high temperature glue 1.3; metal tube plate 2; sealing strip 3; boss 3.1; boss hole 3.1.1; serrated protrusion 3.1.1.1; convex rib 3.2; pressing plate 4; mounting hole 4.1; screw 5; PTFE support rod 6; short support bar 7; long support bar 8. DETAILED DESCRIPTION

[0027] See also Figure 1-11 The present invention relates to a detachable sealing structure of a non-metallic plate type air preheater, comprising a non-metallic heat exchange plate group, the ends of which are sequentially sleeved with a metal tube sheet 2 and a sealing strip 3, the outer end surface of the sealing strip 3 is provided with a boss 3.1, the boss 3.1 is sleeved with a pressure plate 4, the pressure plate 4 is pressed and fixed to the metal tube sheet 2 by screws 5, and the non-metallic heat exchange plate group is provided with a plurality of non-metallic heat exchange units 1.

[0028] Each non-metallic heat exchange unit 1 includes a metal support bar 1.1 symmetrically arranged up and down and a non-metallic plate 1.2 symmetrically arranged left and right. The metal support bar 1.1 and the non-metallic plate 1.2 are connected to form an annular channel. The outer wall of the annular channel is key-shaped. The end of the non-metallic plate 1.2 is fixed to the metal support bar 1.1 by a high-temperature glue 1.3. The non-metallic plate 1.2 is made of heat-resistant glass plate or PTFE plate. The main component of this material does not react with sulfuric acid, so it is impossible for the heat exchange element to corrode in the low temperature section. The exhaust gas temperature can be reduced to the maximum extent to increase the combustion air temperature and improve the heating efficiency of the furnace.

[0029] The metal support bar 1.1 is made of stainless steel metal rods. The cross section of the metal support bar 1.1 is circular. The end of the metal support bar 1.1 corresponding to the non-metallic plate 1.2 is symmetrically provided with an L-shaped notch 1.1.1. The L-shaped notch 1.1.1 divides the metal support bar 1.1 into an internal support structure 1.1.2 and an external semicircular structure 1.1.3. High temperature glue 1.3 is applied to the surface of the L-shaped notch 1.1.1. The high temperature glue 1.3 bonds the metal support bar 1.1 and the non-metallic plate 1.2 together. Since the high temperature glue 1.3 has an elongation elasticity of up to 2.9 times after solidification, it can effectively avoid the problem of non-metallic heat exchange plate fragmentation caused by the different thermal expansion coefficients of the metal support bar and the non-metallic heat exchange plate.

[0030] The metal tube sheet 2 is provided with tube sheet holes corresponding to the non-metallic heat exchange unit 1, the metal tube sheet 2 is provided with threaded holes, and the pressing plate 4 is provided with mounting holes 4.1 corresponding to the threaded holes, which greatly improves the convenience of equipment inspection and maintenance.

[0031] After the non-metallic plate heat exchange unit 1 is installed in the tube sheet hole, the stress is mainly concentrated on the two metal support bars. The weight of the non-metallic heat exchange plate is transferred to the metal support bar through the soft connection form of high-temperature glue, and the weight of the entire non-metallic plate heat exchange unit 1 is dispersed into the tube sheet hole through the semicircular structure 1.1.3 of the metal support bar, which can effectively avoid damage to the non-metallic heat exchange plate caused by stress concentration.

[0032] The boss 3.1 is provided with a boss hole 3.1.1 corresponding to the non-metallic heat exchange unit 1, and the hole wall of the boss hole 3.1.1 is provided with a serrated protrusion 3.1.1.1, which forms an interference fit after being squeezed by utilizing the toughness of silicone to ensure the sealing of the equipment. The inner and outer end surfaces of the sealing strip 3 are provided with convex ribs 3.2, and the inner end surface of the pressure plate 4 is pressed tightly against the outer end surface of the sealing strip 3. The sealing strip 3 is made of silicone material, which has high adsorption performance, stable chemical properties, good thermal stability, high mechanical strength, etc., and adopts an integrated molding technology. Since the metal tube sheet and the pressure plate are both made of metal, considering that the smoothness of the metal surface is not very high, the sealing strip 3 adds convex ribs 3.2 on the contact surface with the metal tube sheet and the pressure plate, and the sealing strip 3 has better sealing performance after being squeezed.

[0033] A PTFE support rod 6 is provided between two adjacent non-metallic heat exchange units 1, and the length direction of the PTFE support rod 6 is the same as the flue gas flow direction. In the air flow direction, when the length of the non-metallic heat exchange unit is too long, the PTFE support rod 6 can prevent the metal support bar and the non-metallic heat exchange plate from being too deflected, resulting in the heat exchange plate being broken.

[0034] In order to improve the strength of the non-metallic heat exchange unit port, a non-metallic support bar is provided inside the port of each non-metallic heat exchange unit 1. The non-metallic support bar includes a short support bar 7 and a long support bar 8. The short support bar 7 is provided with two and is symmetrically arranged at the center of the end of the non-metallic heat exchange unit 1. The long support bar 8 is consistent with the length of the non-metallic heat exchange unit 1. The long support bar 8 is provided with two, and the two long support bars 8 are symmetrically arranged on the upper and lower sides of the short support bar 7.

[0035] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A detachable sealing structure of a non-metallic plate-type air preheater, characterized in that: it comprises a non-metallic heat exchange plate group, the ends of the non-metallic heat exchange plate group are sleeved with a metal tube sheet (2) and a sealing strip (3) in sequence, the outer end surface of the sealing strip (3) is provided with a boss (3.1), the boss (3.1) is sleeved with a pressure plate (4), the pressure plate (4) is pressed and fixed to the metal tube sheet (2) by screws (5), and the non-metallic heat exchange plate group is provided with a plurality of non-metallic heat exchange units (1); Each non-metallic heat exchange unit (1) comprises a metal support bar (1.1) symmetrically arranged in an upper and lower direction and a non-metallic plate (1.2) symmetrically arranged in a left and right direction, the metal support bar (1.1) and the non-metallic plate (1.2) being connected to form an annular channel, and the end of the non-metallic plate (1.2) being fixed to the metal support bar (1.1) by means of high-temperature glue (1.3); The cross section of the metal support bar (1.1) is circular, and the end of the metal support bar (1.1) corresponding to the non-metal plate (1.2) is symmetrically provided with an L-shaped notch (1.1.1), and the L-shaped notch (1.1.1) divides the metal support bar (1.1) into an internal support structure ( 1.1.2) and an external semicircular structure (1.1.3); The boss (3.1) is provided with a boss hole (3.1.1) corresponding to the non-metallic heat exchange unit (1), and the hole wall of the boss hole (3.1.1) is provided with a sawtooth protrusion (3.1.1.1).

2. The detachable sealing structure of a non-metallic plate type air preheater according to claim 1 is characterized in that: Both inner and outer end surfaces of the sealing strip (3) are provided with convex ribs (3.2), and the inner end surface of the pressing plate (4) is tightly fitted and pressed against the outer end surface of the sealing strip (3).

3. The detachable sealing structure of a non-metallic plate type air preheater according to claim 1 is characterized in that: A PTFE support rod (6) is provided between two adjacent non-metallic heat exchange units (1), and the length direction of the PTFE support rod (6) is the same as the direction of the flue gas flow.

4. The detachable sealing structure of a non-metallic plate type air preheater according to claim 1, characterized in that: A non-metallic support strip is provided inside the port of each non-metallic heat exchange unit (1).

5. The detachable sealing structure of a non-metallic plate type air preheater according to claim 4, characterized in that: The non-metallic support bar comprises a short support bar (7) and a long support bar (8); two short support bars (7) are provided and are symmetrically arranged at the center of the end of the non-metallic heat exchange unit (1); the long support bar (8) is consistent with the length of the non-metallic heat exchange unit (1); two long support bars (8) are provided and are symmetrically arranged on the upper and lower sides of the short support bar (7).

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