Modified PPS flue gas heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a modified PPS (polyphenylene sulfide) flue gas heat exchanger, which comprises a tube plate, a plurality of heat exchange tubes, a plurality of heat exchange tubes, a plurality of heat exchange tubes, a plurality of heat exchange tubes, a plurality of heat exchange tubes and a plurality of heat exchange tubes, the rubber gasket is mounted at the slotted hole in the tube plate; the novel high-thermal-conductivity modified PPS tube sequentially penetrates through the tube plate and the rubber gasket until reaching the position where the novel high-thermal-conductivity modified PPS tube needs to be installed. The heat exchange tube of the heat exchanger is made of novel high-heat-conductivity modified PPS, the novel high-heat-conductivity modified PPS is formed by compounding a high-heat-conductivity nano composite material and various nano-scale special materials, the heat conductivity coefficient is greatly improved, and compared with a traditional metal material, the heat exchange tube has the advantages that the heat exchange tube is made of high-heat-conductivity modified PPS; the high-temperature-resistant flame-retardant cable material has the advantages of high mechanical strength, high temperature resistance, high flame retardance, strong corrosion resistance, good heat-conducting property and flame retardance, and no corrosion opening, cracking or air leakage after long-time use.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a modified PPS flue gas heat exchanger. Background Art

[0002] At present, heat exchanger technology is widely used, and is commonly seen in industrial fields such as petroleum, chemical, electric power, metallurgy, and shipbuilding. It is not only an indispensable equipment in the industry, but also an important equipment for improving energy utilization.

[0003] Heat exchangers can be divided into surface type, heat storage type, direct contact type, fluid connection indirect type and complex heat exchangers according to different heat transfer principles; they can be divided into heaters, preheaters, superheaters and evaporators according to different uses; they can be divided into floating head heat exchangers, fixed tube sheet heat exchangers, U-shaped tube sheet heat exchangers, plate heat exchangers, etc. according to different structures.

[0004] In the transformation of flue gas waste heat recovery and desulfurization systems, a heat exchanger is generally added. The principle of the heat exchanger is to use the heat of the original flue gas before the desulfurization tower to heat the desalted water or hot water network. This heat exchanger can not only effectively utilize the waste heat in the original flue gas before the desulfurization tower, but also save the process water of the desulfurization tower, achieving the dual purpose of energy and water saving.

[0005] In the new era, product systematization, high efficiency and energy saving have become the main market trends. Although the mainstream heat exchangers in China are generally traditional metal heat exchangers, the development of new materials and upgrading technologies are the development trends of the heat exchanger industry. At present, the utilization rate of traditional metal heat exchangers continues to decline, and the development of new heat exchangers to improve heat exchange efficiency and service life is the current mainstream trend.

[0006] Traditional metal heat exchangers have simple structures, stable performance, simple processes, and are easy to process, but they have many disadvantages:

[0007] (1) The heat exchange tube is made of metal, which is prone to corrosion, cracking, and air leakage during use;

[0008] (2) When the heat exchange tube is made of metal, when the equipment is manufactured and installed, the heat generated by welding when the heat exchange tube is connected with other parts or elbows will have a certain impact on the size and quality of the heat exchange tube, affecting the efficiency of the heat exchanger;

[0009] (3) The connection between the metal heat exchanger tube sheet and the heat exchange tube adopts the traditional welding process. The tubes are densely packed and the welding amount is large. It is easy to have incomplete welding and a certain gap between the heat exchange tube and the tube sheet, which affects the life of the heat exchanger.

[0010] (4) The expansion joints (weld joints) between the heat exchange tubes and the tube sheets are prone to cracking and air leakage;

[0011] (5) The fixing gasket is not able to bear enough pressure, is corroded or deteriorated, and the bolt is not strong enough, is loose or corroded;

[0012] (6) Metal heat exchange tubes are prone to scaling and are not flushed regularly, which results in poor heat transfer.

[0013] Since traditional metal heat exchangers have many disadvantages in current use, research on changing the material and system structure of the heat exchanger has a very important impact on the actual application of the heat exchanger.

[0014] To this end, we proposed a modified PPS flue gas heat exchanger to solve the problem. Utility Model Content

[0015] The utility model aims to provide a modified PPS flue gas heat exchanger to solve the problems in the above-mentioned background technology.

[0016] To achieve the above object, the utility model provides the following technical solution: a modified PPS flue gas heat exchanger, comprising:

[0017] A tube sheet, the tube sheet is fastened to the modified PPS flue gas heat exchanger, and a slot is provided inside the tube sheet;

[0018] Rubber gasket, installed in the slot in the tube sheet;

[0019] The new high thermal conductivity modified PPS tube is passed through the tube sheet and rubber gasket in sequence until it reaches the required installation position;

[0020] The modified PPS flue gas heat exchanger comprises:

[0021] Header, mounted on the tube sheet;

[0022] The fixed frame is connected to the tube sheet by bolts through the legs;

[0023] The new high thermal conductivity modified PPS tube bundles are multiple in number and are installed one by one corresponding to the openings of the tube sheet;

[0024] The flushing water main pipe passes through the reserved holes of the flushing water main pipe on the tube sheet in sequence and is welded and fixed to the flushing water main pipe outlet flange assembly by welding;

[0025] One end of the flushing water PFA pipe is fixed to the fixed nozzle on the flushing water branch pipe with a clamp, and the other end passes through the reserved holes on the front and rear ladder plates in turn, and is distributed on each floor;

[0026] The side wind deflector is connected to the fixed frame by bolts.

[0027] Preferably, the novel high thermal conductivity modified PPS tube is connected to the tube sheet by using customized screw fasteners.

[0028] Preferably, the bottom of the custom screw fastener is fastened and sealed to the bottom of the tube sheet opening, and a gasket is provided between the custom screw fastener and the tube sheet.

[0029] The utility model provides a modified PPS flue gas heat exchanger. The modified PPS flue gas heat exchanger has the following beneficial effects:

[0030] The utility model selects a new type of high thermal conductivity modified PPS as the material of the heat exchange tube of the heat exchanger. The new type of high thermal conductivity modified PPS is composed of a high thermal conductivity nano-composite material added with a variety of nano-level special materials, which greatly improves the thermal conductivity coefficient. Compared with traditional metal materials, it has high mechanical strength, high temperature resistance, high flame retardancy, strong corrosion resistance, good thermal conductivity and flame retardancy. There is no corrosion, cracking, or leakage after long-term use. At the same time, the high thermal conductivity modified PPS material is used as the heat exchange tube. When the equipment is manufactured and installed, the heat exchange tube and other patches or elbows are fixed and connected with special customized parts, and no welding is required, which effectively avoids the material loss and influence caused by the welding process.

[0031] The utility model has improved the connection process between the heat exchanger tube sheet and the heat exchange tube. The openings of the tube sheet are arranged neatly and correspond to the heat exchange tubes one by one. The traditional welding process is eliminated, and the gaps in the tube sheet caused by insufficient welding are avoided, which effectively improves the life of the heat exchanger. The structure of the tube sheet adopts a new design, the tube sheet and the heat exchange tube are fixed and sealed, the tube sheet is innovatively opened with special holes, and special fasteners are designed. The fasteners pass through the heat exchange tubes and are threaded to ensure the sealing between the bottom end and the inner side of the tube sheet. While ensuring good sealing, the heat exchange tubes are firmly fixed, effectively ensuring the service life. Compared with traditional metal heat exchangers, air leakage and looseness between the tube sheet holes and the heat exchange tubes are effectively avoided.

[0032] 1. The utility model readjusts the structure of the heat exchanger, optimizes components such as the tube sheet, header, and frame, and connects the heat exchange tubes and the tube sheet with special high-strength fasteners. One header corresponds to a group of tube passes. Compared with the traditional metal heat exchanger structure, it can ensure long-term normal operation under the conditions of high temperature and high pressure in the flue, with stable performance and good heat transfer effect. By adding a new cleaning device to the heat exchanger, the flushing water pipe branch group is arranged in layers, and each layer is evenly distributed, which effectively guarantees the flushing efficiency of the heat exchanger and effectively prevents dust accumulation on the surface. After regular flushing, the surface of the heat exchange tube is kept clean and tidy to ensure the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a new high thermal conductivity modified PPS tube in a modified PPS flue gas heat exchanger of the utility model;

[0034] Figure 2This is a schematic diagram of the distribution structure of a new high thermal conductivity modified PPS tube bundle in a modified PPS flue gas heat exchanger of the utility model.

[0035] In the figure: 1. tube sheet, 2. rubber gasket, 3. gasket, 4. customized screw fasteners, 5. new high thermal conductivity modified PPS tube, 6. header, 8. new high thermal conductivity modified PPS tube bundle, 9. fixed frame, 10. ladder plate, 11. flushing water PFA tube, 12. flushing water main inlet flange assembly, 13. flushing water main, 14. flushing water branch pipe, 15. side wind shield, 16. flushing water main outlet flange assembly. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0037] A preferred embodiment of a modified PPS flue gas heat exchanger provided by the utility model is as follows: Figure 1 to Figure 2 Shown: A modified PPS flue gas heat exchanger, comprising:

[0038] Tube sheet 1, which is fixedly arranged with the modified PPS flue gas heat exchanger, and a slot is provided inside the tube sheet 1;

[0039] The rubber gasket 2 is installed at the slot in the tube sheet 1;

[0040] The new high thermal conductivity modified PPS tube 5 is sequentially passed through the tube sheet 1 and the rubber gasket 2 until the required installation position. The new high thermal conductivity modified PPS tube 5 is connected to the tube sheet 1 by a customized screw fastener 4. The bottom of the customized screw fastener 4 is fastened and sealed with the bottom of the opening of the tube sheet 1, and a gasket 3 is provided between the customized screw fastener 4 and the tube sheet 1.

[0041] Modified PPS flue gas heat exchanger includes:

[0042] Header 6, mounted on tube sheet 1;

[0043] The fixed frame 9 is connected to the tube sheet 1 by bolts through the legs;

[0044] A plurality of new high thermal conductivity modified PPS tube bundles 8 are installed one by one corresponding to the openings of the tube sheet 1;

[0045] The flushing water main pipe 13 passes through the reserved holes of the flushing water main pipe on the tube sheet 1 in sequence and is welded and fixed to the flushing water main pipe outlet flange assembly 16 by welding;

[0046] The flushing water PFA pipe 11 has one end fixed to the fixed nozzle on the flushing water branch pipe 14 by a clamp, and the other end passes through the reserved holes on the front and rear ladder plates 10 in sequence, and is distributed on each floor;

[0047] The side wind shield plate 15 is connected to the fixing frame 9 by bolts.

[0048] Working principle: First install 2 rubber washers to the slots of the tube sheet, pass 5 new high thermal conductivity modified PPS tubes through the tube sheet and rubber washers to the installation position, use 4 custom screw fasteners and 1, the tube sheet opening is threaded, after the threads are tightened, the 2 rubber washers can effectively ensure the sealing of the tube holes, the bottom of the 4 custom screw fasteners is tightly sealed with the bottom of the tube sheet opening, and 3 gaskets are added to ensure the tight sealing of the tube sheet surface, so as to achieve 3 strict seals, such as Figure 1 as stated;

[0049] First, connect the 7 tube sheets through the 9 fixed frame, and connect them with bolts through the legs; install the openings of the 7 tube sheets and the 8 new high thermal conductivity modified PPS tube bundles one by one in sequence, and use the above-mentioned sealing method to fix and seal them; install the 6 headers on the 7 tube sheets, and seal them with bolts and customized gaskets; pass the 13 flushing water main pipes through the reserved holes for the flushing water main pipes on the 7 tube sheets in sequence, and use welding to fix the 13 flushing water main pipes and the 7 tube sheets, and then weld and fix the 16 flushing water main pipe outlet flange assembly to the 13 flushing water main pipes; one end of the 11 flushing water PFA pipe is fixed to the fixed nozzle on the 14 flushing water branch pipe with a clamp, and the other end passes through the reserved holes on the front and rear 10 ladder plates in sequence, and each layer is evenly distributed; after the above assembly is completed, assemble the 15 side wind shield plate with the 9 fixed frame, and use threaded connection, such as Figure 2 shown.

[0050] The above description is only an illustrative specific implementation method of the utility model, and is not intended to limit the scope of the utility model. Any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model. It should also be noted that the various components of the utility model are not limited to the above-mentioned overall application. The various technical features described in the specification of the utility model can be selected for use alone or in combination according to actual needs. Therefore, the utility model should naturally cover other combinations and specific applications related to the utility model points of this case.

Claims

1. A modified PPS flue gas heat exchanger, characterized in that: include: A tube sheet (1), the tube sheet (1) being fixedly mounted on the modified PPS flue gas heat exchanger, and having slots formed inside the tube sheet (1); A rubber gasket (2) is installed at a slot in the tube sheet (1); The new high thermal conductivity modified PPS tube (5) is passed through the tube sheet (1) and the rubber gasket (2) in sequence until it reaches the required installation position; The modified PPS flue gas heat exchanger comprises: A header (6) mounted on the tube sheet (1); A fixed frame (9) is connected to the tube sheet (1) by bolts via legs; A plurality of new high thermal conductivity modified PPS tube bundles (8) are installed one by one corresponding to the openings of the tube sheet (1); The flushing water main pipe (13) passes through the reserved holes of the flushing water main pipe on the tube sheet (1) in sequence and is welded and arranged, and the flushing water main pipe (13) is welded and fixed to the flushing water main pipe outlet flange assembly (16); The flushing water PFA pipe (11) has one end fixed to the fixed nozzle on the flushing water branch pipe (14) by a clamp, and the other end passes through the reserved holes on the front and rear ladder plates (10) in sequence, and is distributed on each layer; The side wind shield plate (15) is connected to the fixed frame (9) by bolts.

2. A modified PPS flue gas heat exchanger according to claim 1, characterized in that: The novel high thermal conductivity modified PPS tube (5) and the tube sheet (1) are connected by using a customized screw fastener (4).

3. A modified PPS flue gas heat exchanger according to claim 2, characterized in that: The bottom of the custom screw fastener (4) is fastened and sealed to the bottom of the opening of the tube sheet (1), and a gasket (3) is provided between the custom screw fastener (4) and the tube sheet (1).

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