CN201003912Y - Cellular Structure Switch - Google Patents

Abstract

The utility model discloses a beehive type structure exchanger; wherein an exchanger shell(10) takes a hexagon cross section shape, and a pipe bundle is formed into a beehive pipe bundle core(12) consisting of a plurality of short beehive pipe bundles(3) and long beehive pipe bundles(4); wherein the long beehive pipe bundles(4) abut with the short beehive pipe bundles(3) and share a wall face with the latter; and the wall thicknesses of the long beehive pipe bundles(4) and the short beehive pipe bundles(3) are 0.2 to 2 mm; while the two ends of the long beehive pipe bundles(4) are respectively communicated with an inlet(7) and an outlet(1) of a pipe box(8). The utility model has large unit volume heat exchange area and good tightness and large coefficient K, which overcomes the defects of the traditional column pipe type heat exchange pipe bundles that the pipes can not be tightly arranged, and the volume is quite large, yet the total heat exchange area is rather small, thus the economic effect is rather poor. In addition, the utility model has the characteristics of convenient structure, large operation flexibility and convenient maintenance and washing.

Description

Cellular Structure Switch

technical field

The utility model relates to a shell-and-tube heat exchanger in energy technology, in particular to a honeycomb structure exchanger.

Background technique

Heat exchanger is a general process equipment widely used in power, metallurgy, refrigeration, oil refining, chemical industry, aviation, atomic energy, medicine and other industrial sectors. With the increasingly prominent energy problems, it is required to reduce the volume of the equipment as much as possible under the premise of satisfying the heat exchange, that is, to improve the compactness of the equipment, thereby reducing the weight of the equipment, saving materials, and correspondingly reducing the occupied area. As a result, high-efficiency heat exchangers came into being. In some application fields, there are special requirements for the size and weight of heat exchange equipment. Therefore, ultra-compact heat exchangers with small volume and large heat exchange area per unit volume have become a necessity for the production and development of heat exchange equipment. The structure belongs to the field of shell and tube heat exchangers. Due to the mature technology of shell-and-tube heat exchangers, highly reliable structure and wide adaptability, their output and application still occupy a very important position in industrial production. Although the development of related technologies has partially supplemented and improved the design and manufacturing technology of traditional tube-and-tube heat exchangers, there has been no breakthrough, and the limitations of its use have become more and more prominent, specifically as follows several aspects:

(1) The heat exchange area per unit volume is small and the compactness is poor. Due to installation reasons, the tubes in the tube bundle cannot be closely arranged. Although the shell and tube heat exchanger has a large volume, the total heat exchange area is small, so the economic effect is poor.

(2) The heat transfer coefficient is small and the efficiency is low. The heat transfer coefficient is an important index to measure the performance of the heat exchanger. After a lot of research and improvement, although the heat transfer coefficient of the shell and tube heat exchanger has been improved, it is at the cost of increasing the pressure loss, and the overall efficiency is still very low.

(3) Poor reliability. Tube bundle vibrations are likely to occur at high flow rates, causing tube ruptures, damage to equipment foundations and pipelines, and noise at the same time. It is difficult to control and prevent vibration through theoretical calculations. Although some new anti-vibration structures have also been developed in engineering applications, the effect is not satisfactory.

(4) The production cycle is long and the metal consumption is large. The tube bundle of a traditional tube-and-tube heat exchanger is composed of thousands of tubes. The diameter of the tube sheet can reach 3 to 5 m, and the thickness is tens of centimeters. The requirements for drilling accuracy and finish are relatively strict. Using a CNC drilling machine, the drilling cycle is about 25 days, and the production cycle is long; the amount of chips can reach several tons or even dozens of tons, and the material waste is relatively large.

(5) It is difficult to assemble, overhaul and maintain. The gap between the tube and the hole, the tube bundle and the shell is very small, and the assembly of the tube bundle and the assembly of the tube bundle and the shell require small deviations in roundness or straightness, which is relatively difficult. The distance between the tubes is small, it is difficult to place testing instruments, and it is impossible to detect and maintain local dangerous parts.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the tube arrangement mode in the prior art, and provide a regular hexahedral heat exchanger with a honeycomb bionic structure.

The purpose of this utility model is achieved through the following technical solutions:

A honeycomb structure exchanger, including a shell and a tube bundle, the shell is provided with a fluid inlet and a fluid outlet, the two ends of the shell are respectively provided with a tube box, and the tube box is provided with a tube bundle fluid inlet and outlet, the shell It is in the shape of a regular hexagonal cross-section. The tube bundle is composed of a plurality of short honeycomb tube bundles and long honeycomb tube bundles to form a honeycomb tube bundle core. 2mm, the two ends of the long honeycomb tube bundle are respectively connected with the inlet and outlet in the tube box.

In order to further realize the purpose of the utility model, the long honeycomb tube bundles are connected through a partition connecting device, which includes a partition, a partition strip, an edge bead and a sealing strip, and is tightly connected in a detachable manner.

The honeycomb long honeycomb tube bundle is connected to the separator through expansion joint, brazing fixation, expansion joint plus welding or detachable sealing connection.

The tube boxes at both ends are detachably connected to the shell. The detachable connection is that flanges are welded at both ends of the shell, and the partition is clamped between the two flanges and fixed by bolts.

The gap between the outer edge of the honeycomb tube bundle core and the shell is less than 3mm.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) The thin plate made of metal in the utility model has a thickness of 0.2-2 mm. Since the plate is very thin, the heat transfer coefficient K is large. For example, in the heat exchanger, the heat transfer coefficient of water to water can reach 1500-3700w/m ² .℃.

(2) Large heat exchange area per unit volume and good compactness. The side length of the honeycomb structure is small (generally 2-10mm), and the structure is compact. The heat transfer surface provided per unit volume is 100-380m ² /m ³ ; while the shell-and-tube heat exchanger is only 40-150m ² /m ³ . The utility model overcomes the disadvantages that the tubes in the tube bundle of the traditional tube-and-tube heat exchanger cannot be closely arranged, the volume is large, but the total heat exchange area is small, so the economic effect is poor.

(3) The production cycle is short and the metal consumption is small. The structure can realize compression molding, save internal assembly, and a variety of processing techniques, without the amount of chips. The equipment has the structural characteristics of easy assembly, high flexibility in operation, and convenient maintenance and cleaning.

(4) The honeycomb structure creates the strongest geometric structure with the least consumables, and has excellent mechanical properties. It has a strong supporting effect, and the allowable operating pressure is also high, up to 5MPa. At the same time, due to the characteristics of the honeycomb structure, the internal heat exchange structure forms a rigid whole, and no vibration will occur under high flow rates.

(5) In this heat exchange equipment, the inner core is composed of a honeycomb tube bundle with an overall structure, and the honeycomb frame clamping group is light and rigid. Pressure-resistant and tensile-resistant.

Description of drawings

Fig. 1 is the structural representation of the utility model honeycomb structure exchanger;

Fig. 2 is a schematic diagram of the connection relationship between the long honeycomb tube bundle and the short honeycomb tube bundle in Fig. 1;

Fig. 3 is A-A to sectional view among Fig. 1;

Fig. 4 is B-B direction sectional view among Fig. 1;

Fig. 5 is the enlarged schematic view of the clapboard in Fig. 4;

Fig. 6 is an enlarged schematic view of the side bead in Fig. 4;

Fig. 7 is a sectional view along line C-C in Fig. 4 .

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation of the utility model is not limited thereto.

As shown in Figure 1, a honeycomb structure exchanger includes a shell 10 and a tube bundle, the shell 10 is provided with a fluid inlet 2 and a fluid outlet 9, the two ends of the shell 10 are respectively provided with a pipe box 8, and the pipe box 8 is provided with A tube bundle fluid inlet 7 and an outlet 1 are provided, and the housing 10 has a regular hexagonal cross-sectional shape. The tube bundle consists of a plurality of short honeycomb tube bundles 3 and long honeycomb tube bundles 4 to form a honeycomb tube bundle core 12, and the gap between the outer edge of the honeycomb tube bundle core 12 and the shell 10 is less than 3mm. Both ends of the long honeycomb tube bundle 4 communicate with the inlet 7 and the outlet 1 in the tube box 8 respectively.

As shown in Figure 2, the long honeycomb tube bundle 4 and the short honeycomb tube bundle 3 are adjacent to each other and share a wall. The wall thickness of the long honeycomb tube bundle 4 and the short honeycomb tube bundle 3 is 1.0 mm, and the wall thickness can be selected from any thickness value between 0.2 and 2 mm.

As shown in Figure 3, the long honeycomb tube bundles 4 are connected through a partition connecting device 11, which includes a partition strip 13, an edge bead 14 and a sealing strip 15, which are tightly connected by detachable, specifically the partition strip 13 is assembled with the part of the long honeycomb tube bundle 4 at intervals, and the middle is coated with sealant. The sealing strip 15 is filled in the groove of the side bead 14, and the partition strip 13 is assembled in the side bead 14. Force deformation to achieve sealing.

The tube boxes 8 at both ends are detachably connected to the housing 10 . Specifically, both ends of the housing 10 are welded with flanges 5 , and the partition plate 11 is clamped between the two flanges and fixed by bolts 6 .

1. Fabrication of separators

The blanks for the partition strips can be sheet steel or composite. When a single material cannot resist the corrosion of the heat exchange medium on both sides at the same time, a bimetallic plate must be used. Its manufacturing methods are mainly molding, cutting and so on. Guarantee the geometric fit with the honeycomb tube bundle. The processing of the partition strip is the main link in the partition manufacturing process, and the following requirements should be met as much as possible:

① Ensure the position and dimensional accuracy of the holes, such as the geometric centering, concentricity and processing finish of the partition strips;

② The cutting surface of the partition strip is perpendicular to the plane of the partition;

③The partition is perpendicular to the sealing surface;

④ If there is a partition groove, it should be symmetrical to the center line of the partition.

In addition, in order to ensure the concentricity of the partitions, several partitions can be stacked and cut together.

2. Manufacture of honeycomb heat exchange tube bundle

The surface treatment of metal foil needs to go through alkali cleaning and degreasing, nitric acid photochemical, phosphoric acid anodization, drying, dipping primer drying, drying after coating the core strip glue and hot pressing curing of the core strip glue, plus Thermocompression curing of metal honeycomb structures.

3. Manufacture of shell

The shell of the honeycomb heat exchanger is the same as the manufacturing and molding of the cylinder section of the general square pressure vessel, and can be divided into two processing methods: cold and hot. When the thickness of the steel plate exceeds 2.5mm, the thermal method should be used; for ordinary heat exchangers, if there is no special requirement, it is generally a normal and low pressure vessel, and the steel plate used is thin, so the cold method can be used.

As the shell of the heat exchanger, since a long tube bundle needs to be installed inside the shell, the tube bundle should have an anti-friction design, and the assembly gap between the tube bundle and the inner wall of the shell is generally not more than 3mm; the shell is not straighter than the shell 1/1000 of the length; the weld on the inner wall of the shell is required to be welded with a backing plate to keep the inner wall flat.

Bending forming is often carried out on special bending machines and plate rolling machines. When steel plates are rolled on the plate rolling machine, it is necessary to pay attention to keeping the longitudinal edges of the steel plates strictly parallel to the axis of the rollers. The cylinders after roll forming are immediately spot-welded. Welding can be manual arc welding or submerged arc automatic welding, and it should be carried out in accordance with relevant regulations. And it should be noted that the connecting pipe should not be opened on the welding seam, and should be flush with the inner surface connected with it.

In the manufacturing process of the heat exchanger, it is very important to ensure the tight and tight connection between the tube bundle and the partition. If the quality of the connection is not good, the cold and hot fluids will leak together, and the connection between the tube bundle and the partition may be pulled off under the action of the temperature difference stress and the pressure difference between the tube side and the shell side. Due to the different use conditions and processing conditions of the heat exchanger, the connection methods mainly include expansion joints, brazing fixation, expansion joints plus welding, detachable sealing connections, etc.

(1) Expansion

Attention should be paid to the application of expansion joints: the expansion rate should be appropriate; the hardness of the partition should be HB20-30 higher than that of the end of the tube bundle to produce the necessary elastic recovery and ensure the strength of the expansion joint; the joint surface of the tube and the partition must be smooth; the expansion joint generally adopts Special tube expander mechanical tube expansion and other methods.

(2) Brazing fixation

The welding process is simple, the connection strength is good, and the tightness can be guaranteed, and the tightness and pull-off resistance of the joint can also be guaranteed under high temperature and high pressure, or deep cooling.

(3) Expansion and welding

Expansion joints and welding have their own advantages and disadvantages, especially under high temperature and high pressure, the pipe end joints are faced with extremely harsh working environments, and expansion joints or welding alone cannot meet the requirements, which requires the use of expansion joints The method of welding. Expansion joint plus welding can not only improve the fatigue resistance of the joint, but also eliminate stress corrosion and crevice corrosion, and improve the service life.

(4) Detachable sealed connection

Detachable sealing connection processing, easy installation, use the joint surface to add sealing material, the connection is well sealed, and the tightness can be guaranteed. Different sealing materials can also ensure the tightness and tensile strength of the joint under high temperature and high pressure, or deep cold off the ability.

The honeycomb structure exchanger of the utility model is self-contained, and can be matched with the structure and component size designed in GB151-99. The same type of dividing wall heat exchanger can be used instead, especially in the occasions where the flow rate is small, there is obvious induced vibration, the space requirement is compact, and the heat exchange area is large. When this structure works in the heat exchanger, two different media pass through the inside and outside of the tube, and the two media exchange heat through the tube wall. The increased heat transfer area improves the heat transfer capacity of the heat exchanger, while The partition wall is very thin, which improves the heat transfer coefficient.

The heat exchange equipment can be widely used in small refrigeration equipment. The honeycomb flow channel can form a very small flow channel, and its good size matching has an important impact on the performance of the entire heat exchange system. Especially in the field of refrigeration, most of the current studies on the characteristics of refrigerant two-phase flow in thin tubes are based on the homogeneous flow model of two-phase flow, and most of them ignore the actual metastable phenomenon. Taking the adiabatic thin tube as the research object, the establishment A two-phase flow drift mathematical model was established, and the metastable phenomenon in the refrigerant flow process was considered. Through the calculation of the refrigerant thermodynamic properties, thermodynamic state parameters and thermodynamic process, the numerical calculation of the adiabatic thin tube was realized; the adiabatic thin tube was built. The experimental device for the study of tube two-phase flow characteristics has a good agreement between the experimental data and the numerical calculation results.

Claims (6)

1, honeycomb type fabric switch device, comprise housing (10) and tube bank, housing (10) is provided with fluid inlet (2) and fluid issuing (9), housing (10) two ends are respectively equipped with bobbin carriage (8), bobbin carriage (8) is provided with tube bank fluid inlet (7) and outlet (1), it is characterized in that described housing (10) is the regular hexagonal section shape, described tube bank is formed honeycomb tube bank core (12) by a plurality of short honeycomb tube banks (3) and long honeycomb tube bank (4), long honeycomb tube bank (4) is adjoined with short honeycomb tube bank (3), shared wall, long honeycomb tube bank (4) is 0.2～2mm with the wall thickness of short honeycomb tube bank (3), long honeycomb tube bank (4) two ends respectively with bobbin carriage (8) in import (7) and export (1) and be communicated with.

2, honeycomb type fabric switch device according to claim 1, it is characterized in that described long honeycomb tube bank (4) connects by dividing plate jockey (11), dividing plate jockey (11) comprises separator strip (13), limit press strip (14) and sealing strip (15), separator strip (13) is restrained the part assembly at interval that (4) grow with long honeycomb, the centre scribbles fluid sealant, sealing strip (15) is filled out in the groove that is enclosed in limit press strip (14), separator strip (13) is assemblied in the limit press strip (14), realizes sealing by the stress deformation of sealing strip (15).

3, honeycomb type fabric switch device according to claim 2, it is characterized in that long honeycomb tube bank (4) and dividing plate (13) by expanded joint, soldering fix, expanded joint adds welding or removable being tightly connected.

4, honeycomb type fabric switch device according to claim 1 is characterized in that two ends bobbin carriage and housing are removable the connection.

5, according to the described honeycomb type fabric switch of claim 4 device, it is characterized in that removable housing (10) two ends that are connected to all are welded with flange (5), dividing plate (11) is clamped between two flanges, and is fixing by bolt (6).

6, honeycomb type fabric switch device according to claim 1, the gap that it is characterized in that honeycomb tube bank core (12) outer and housing (10) is less than 3mm.

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