A new phenolic resin graphite tubular air preheater structure

Abstract

The utility model relates to the technical field of air preheater, in particular to a novel phenolic resin graphite pipe type air preheater structure, and the combination of phenolic resin and graphite endows phenolic resin graphite heat exchange pipe with excellent corrosion resistance, under the erosion of various acids, salts, chloride ions and other chemicals, the profiled phenolic resin graphite pipe can keep stable, greatly meets the heat exchange requirement of hydrochloric acid, phosphoric acid and sulfuric acid working medium, reduces the abrasion of the inner wall of phenolic resin graphite heat exchange pipe, and further prolongs the service life, the utility model discloses a steel structure frame, upper tube sheet and lower tube sheet, the steel structure frame top is provided with upper tube sheet, the steel structure frame bottom is provided with lower tube sheet, is provided with a plurality of groups of upper tube holes on the upper tube sheet, is provided with a plurality of groups of lower tube holes on the lower tube sheet, and the upper tube hole and the lower tube hole correspond one by one, further including phenolic resin graphite heat exchange pipe, and a group of phenolic resin graphite heat exchange pipes respectively pass through a group of upper tube holes and a group of lower tube holes.

Description

Technical Field

[0001] This utility model relates to the technical field of air preheaters, and in particular to a novel phenolic resin graphite tube air preheater structure. Background Technology

[0002] Graphite pipes, as an important engineering material, play a crucial role in many industrial fields. Their unique properties make them an ideal choice for solving many complex technological problems. Currently, enamel-lined pipes are the most commonly used in the market. Enamel coating is a glass or ceramic coating that protects the metal substrate, preventing corrosion and oxidation, and provides insulation. Due to its superior corrosion resistance, high hardness, strong oxidation resistance, and low price, it is widely used in air preheaters. While enamel-lined pipes have good corrosion resistance, they can still fail.

[0003] Large-diameter bubbles reduce the effective thickness of the coating. The sharp corners of the bubbles are stress concentration points, which are the root cause of cracks. Under the action of temperature and stress, the cracks propagate, leading to coating cracking and peeling. The high temperature during the welding process can cause certain damage to the coating, and the uneven distribution of elements at the weld makes it difficult to form a dense coating. Corrosive media can easily corrode the metal substrate through areas with insufficient thickness. The enamel coating and the metal substrate are two materials with significantly different physical properties, and their coefficients of thermal expansion are very different. Under the action of thermal deformation of the metal substrate, cracking is easily triggered. The thickness of the enamel tube is uneven, and corrosion occurs preferentially in thinner areas and areas where alkali metals accumulate in the coating. Alkali metals easily react with HCl and dissolve in the solution, leaving loose and porous SiO2 in the enamel coating, which leads to coating failure. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a novel phenolic resin graphite tube air preheater structure.

[0005] This utility model discloses a novel phenolic resin graphite tubular air preheater structure, comprising a steel frame, an upper tube sheet, and a lower tube sheet. The upper tube sheet is located at the top of the steel frame, and the lower tube sheet is located at the bottom of the steel frame. The upper tube sheet has multiple sets of upper tube holes, and the lower tube sheet has multiple sets of lower tube holes, with each set corresponding to a different upper and lower tube hole. The device also includes phenolic resin graphite heat exchange tubes, with each set of tubes passing through one set of upper tube holes and one set of lower tube holes. The combination of phenolic resin and graphite imparts excellent resistance to corrosion to the phenolic resin graphite heat exchange tubes. In terms of corrosion resistance, the pressed phenolic resin graphite tubes remain stable even when subjected to various acids, salts, chloride ions, and other chemical substances, greatly satisfying the heat exchange requirements of hydrochloric acid, phosphoric acid, and sulfuric acid working media. They also meet the high-intensity dew point corrosion conditions of various sulfur-containing and chlorine-containing flue gases, extending service life. Furthermore, the phenolic resin graphite heat exchange tubes are less prone to scaling, which reduces fluid flow resistance, lowers energy loss, and minimizes wear on the inner wall, further extending their service life.

[0006] Preferably, it also includes a support plate, which is provided inside the steel structure frame, and multiple sets of phenolic resin graphite heat exchange tubes pass through the support plate; the support plate reinforces the multiple sets of phenolic resin graphite heat exchange tubes inside the steel structure frame, preventing the phenolic resin graphite heat exchange tubes from vibrating and improving their service life.

[0007] Preferably, both the upper tube sheet and the lower tube sheet are double-layer tube sheets.

[0008] Preferably, the top of the phenolic resin graphite heat exchange tube passes through the upper tube hole, and the top of the phenolic resin graphite heat exchange tube is flush with the top of the upper tube sheet. A flexible graphite gasket is provided between the upper tube hole and the phenolic resin graphite heat exchange tube and is sealed with graphite phenolic resin adhesive. The phenolic resin graphite heat exchange tube and the upper tube hole are sealed with a flexible graphite gasket and graphite phenolic resin adhesive, ensuring that the flue gas is transported through multiple sets of phenolic resin graphite heat exchange tubes and preventing leakage. The flexible graphite gasket has the characteristics of high temperature resistance, corrosion resistance and self-lubrication, and is widely used in sealing scenarios of high temperature, high pressure or corrosive media. The graphite phenolic resin adhesive has the characteristics of high temperature resistance, corrosion resistance and strong adhesion.

[0009] Preferably, the bottom end of the phenolic resin graphite heat exchange tube passes through the lower tube hole, and the bottom end of the phenolic resin graphite heat exchange tube is lower than the bottom end of the lower tube sheet. A graphite packing is provided between the lower tube hole and the phenolic resin graphite heat exchange tube and is sealed by corrosion-resistant sealant. The graphite packing has good high temperature resistance, corrosion resistance, wear resistance and insulation properties.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The combination of phenolic resin and graphite endows the phenolic resin graphite heat exchange tube with excellent corrosion resistance. Under the erosion of various chemicals such as acids, salts, and chloride ions, the pressed phenolic resin graphite tube can remain stable, which greatly meets the heat exchange requirements of hydrochloric acid, phosphoric acid, and sulfuric acid working media. At the same time, it meets the high-intensity dew point corrosion conditions of various sulfur-containing flue gas and chlorine-containing flue gas, thus improving the service life. The phenolic resin graphite heat exchange tube is not prone to scaling, which reduces the resistance of fluid flow in the tube, reduces energy loss, and also reduces wear on the inner wall of the phenolic resin graphite heat exchange tube, further extending its service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the first isometric structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the second isometric structure of this utility model;

[0013] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0014] The attached diagram is labeled as follows: 1. Steel structure frame; 2. Upper tube sheet; 3. Lower tube sheet; 4. Phenolic resin graphite heat exchange tube; 5. Support plate. Detailed Implementation

[0015] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0016] Example

[0017] like Figures 1 to 3 As shown, the present invention discloses a novel phenolic resin graphite tubular air preheater structure, comprising a steel frame 1, an upper tube plate 2, and a lower tube plate 3. The upper tube plate 2 is provided at the top of the steel frame 1, and the lower tube plate 3 is provided at the bottom of the steel frame 1. The upper tube plate 2 is provided with multiple sets of upper tube holes, and the lower tube plate 3 is provided with multiple sets of lower tube holes, with the upper tube holes and lower tube holes corresponding one-to-one. It also includes phenolic resin graphite heat exchange tubes 4, with a set of phenolic resin graphite heat exchange tubes 4 passing through a set of upper tube holes and a set of lower tube holes respectively.

[0018] It also includes a support plate 5, which is provided on the inner side of the steel structure frame 1, and multiple sets of phenolic resin graphite heat exchange tubes 4 all penetrate the support plate 5.

[0019] Both the upper tube sheet 2 and the lower tube sheet 3 are double-layer tube sheets; the top end of the phenolic resin graphite heat exchange tube 4 passes through the upper tube hole, and the top end of the phenolic resin graphite heat exchange tube 4 is flush with the top end of the upper tube sheet 2. A flexible graphite gasket is provided between the upper tube hole and the phenolic resin graphite heat exchange tube 4 and sealed with graphite phenolic resin adhesive; the bottom end of the phenolic resin graphite heat exchange tube 4 passes through the lower tube hole, and the bottom end of the phenolic resin graphite heat exchange tube 4 is lower than the bottom end of the lower tube sheet 3. A graphite packing is provided between the lower tube hole and the phenolic resin graphite heat exchange tube 4 and sealed with corrosion-resistant sealant, which is Kaft sealant or ceramic putty.

[0020] In this embodiment, the support plate 5 reinforces multiple sets of phenolic resin graphite heat exchange tubes 4 inside the steel structure frame 1. The top ends of the multiple sets of phenolic resin graphite heat exchange tubes 4 are connected to the flue gas inlet, and the bottom ends of the multiple sets of phenolic resin graphite heat exchange tubes 4 are connected to the flue gas outlet. The flue gas enters the phenolic resin graphite heat exchange tubes 4, and the cooling medium enters the interior of the steel structure frame 1 and cools down the high-temperature flue gas inside the phenolic resin graphite heat exchange tubes 4 through the principle of heat exchange. The bottom end of the phenolic resin graphite heat exchange tubes 4 is lower than the bottom end of the lower tube sheet 3, which effectively prevents the condensate precipitated after the flue gas is cooled from flowing out of the tube sheet and thus corroding the tube sheet.

[0021] The main functions achieved by this utility model are as follows: Through its unique fiber-reinforced formula technology, high-pressure extrusion molding, and medium-temperature heat treatment process, Heda Carbon Energy produces high-molecular graphite tubes with high strength and hardness, capable of withstanding strong pressure and external impacts, and not easily deformed or damaged, thus ensuring stability and reliability during use. The flue gas side uses ZS-1 phenolic resin graphite heat exchange tubes with a unique patented anti-corrosion coating or glass flake coating for corrosion protection, and uses metal plates and support tubes as supports for the heat exchange tubes. This effectively reduces costs while improving the heat exchanger's corrosion resistance to low-temperature flue gas dew points, better meeting the needs of the heat exchanger under complex operating conditions. The modular installation allows for individual module removal for maintenance, greatly reducing the maintenance costs of the air preheater during use.

[0022] The support plate 5 of the novel phenolic resin graphite tubular air preheater structure of this utility model is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A novel phenolic resin graphite tube air preheater structure, comprising a steel frame (1), an upper tube plate (2), and a lower tube plate (3), wherein the upper tube plate (2) is provided at the top of the steel frame (1), and the lower tube plate (3) is provided at the bottom of the steel frame (1), the upper tube plate (2) is provided with multiple sets of upper tube holes, and the lower tube plate (3) is provided with multiple sets of lower tube holes, wherein the upper tube holes and the lower tube holes correspond one-to-one, characterized in that, It also includes phenolic resin graphite heat exchange tubes (4), a set of phenolic resin graphite heat exchange tubes (4) passing through a set of upper tube holes and a set of lower tube holes respectively.

2. The novel phenolic resin graphite tube air preheater structure as described in claim 1, characterized in that, It also includes a support plate (5), and the steel structure frame (1) is provided with a support plate (5) inside, and multiple sets of phenolic resin graphite heat exchange tubes (4) all penetrate the support plate (5).

3. The novel phenolic resin graphite tubular air preheater structure as described in claim 1, characterized in that, Both the upper tube sheet (2) and the lower tube sheet (3) are double-layer tube sheets.

4. The novel phenolic resin graphite tube air preheater structure as described in claim 1, characterized in that, The top end of the phenolic resin graphite heat exchange tube (4) passes through the upper tube hole. The top end of the phenolic resin graphite heat exchange tube (4) is flush with the top end of the upper tube sheet (2). A flexible graphite gasket is provided between the upper tube hole and the phenolic resin graphite heat exchange tube (4) and sealed with graphite phenolic resin adhesive.

5. The novel phenolic resin graphite tube air preheater structure as described in claim 1, characterized in that, The bottom end of the phenolic resin graphite heat exchange tube (4) passes through the lower tube hole. The bottom end of the phenolic resin graphite heat exchange tube (4) is lower than the bottom end of the lower tube sheet (3). Graphite packing is provided between the lower tube hole and the phenolic resin graphite heat exchange tube (4) and is sealed by corrosion-resistant sealant.

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