CN202195726U - Large tubular graphite heat exchanger structure - Google Patents

Abstract

The utility model relates to a large-scale tubular graphite heat exchanger structure, which belongs to the field of heat exchange equipment manufacturing. A large-scale tubular graphite heat exchanger structure, including an upper tube box, a tube sheet, a shell, a lower tube box, and heat exchange tubes. The tube sheet includes two parts, a fixed end and a floating end, and the The heat exchange tube, the fixed end of the tube plate is fixedly connected with the upper tube box, the shell, and the bolt fastener, and it is characterized in that: the heat exchange tube is graphite+resin extruded or processed graphite tube, and the The lower part of the floating end of the tube sheet is inserted into the inside of the lower tube box. The benefit is that it solves the impact of the overall expansion and contraction of the tube bundle on the sealing and heat exchange tubes, the heat exchange tubes are better in resistance to pull-off, the equipment structure is simple, the sealing is good, and the maintenance is convenient.

Description

A Large-scale Tube and Tube Graphite Heat Exchanger Structure

technical field

The utility model relates to a large-scale tubular graphite heat exchanger structure, which belongs to the field of heat exchange equipment manufacturing. the

Background technique

Graphite heat exchangers are widely used at home and abroad, because corrosion-resistant alloy materials are too expensive, and some corrosion-resistant alloy materials cannot meet the requirements of heat exchange equipment for some special strong corrosive media. Graphite heat exchangers can solve these problems. However, most graphite equipment manufacturers still use traditional design, materials, technology and equipment, and have not researched and developed new products that are compatible with the rapid development of my country's related industries to meet market demand. There are two ways to seal the tube sheet and the shell according to the standard conventional practice: packing seal and O-ring seal, but both need to use a larger compression spring to solve the problem of tube bundle expansion and contraction, the structure is complex, and the tube bundle expansion and contraction problem It has not been completely solved, the seal is not reliable, and maintenance is difficult. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a large-scale tube-and-tube graphite heat exchanger structure for the deficiencies in the above-mentioned prior art. the

The utility model provides a large-scale tubular graphite heat exchanger structure, which includes an upper tube box, a tube plate, a shell, a lower tube box, and heat exchange tubes. The tube plate includes two parts, a fixed end and a floating end, between which The heat exchange tube is connected, and the fixed end of the tube plate is fixedly connected with the upper tube box, the shell, and the bolt fastener, and it is characterized in that: the heat exchange tube is extruded or formed by graphite+resin The graphite tube, the lower part of the floating end of the tube sheet is inserted into the lower tube box. the

The fixed end of the tube sheet and the shell are sealed with gaskets and O-rings, and the floating end and the shell are sealed with double O-rings or O-rings plus packing. the

The arrangement of the heat exchange tubes on the tube sheet adopts an equilateral triangle or a rectangle

Compared with the existing technology, the lower part of the floating end of the tube sheet is inserted into the lower tube box, so that the entire heat exchange tube bundle can float freely in the lower tube box, which is called the "obstacle-free free floating" structure, and the original floating tube sheet and The compression spring of the shell sealing structure, the arrangement of the heat exchange tubes on the tube sheet is equilateral triangle or rectangle, which can ensure that the maximum number of tubes can be obtained in a certain tube sheet area, and at the same time make the space between the tubes larger. The cross-sectional area is the smallest to increase the flow rate of the shell side, thereby improving the heat transfer coefficient and ensuring the compactness of the heat exchanger. Both the fixed tube plate and the floating end are made of graphite whole plate or graphite spliced plate. The bonding adopts the embedded cone bonding or the apron sealing adhesive adopts the adhesive prepared by graphite + modified phenolic resin. This bonding form is more resistant to pull-off than other bonding forms.

Description of drawings

Fig. 1 is a structural schematic diagram of a large-scale tubular graphite heat exchanger of the present invention;

Figure 2 shows the double seal structure at the floating end of the tube sheet;

Figure 3 shows the double sealing structure at the fixed end of the tube sheet;

Among them: 1 is the upper tube box, 2 is the tube plate, 3 is the shell, 4 is the lower tube box, 5 is the heat exchange tube, 8 is the upper pressure column, 10 is the O-ring or packing, 11 is the lower pressure column, 20 is an O-ring, 21 is a fixed tube sheet, and 22 is a gasket.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. the

As shown in Figure 1, a large-scale tubular graphite heat exchanger structure includes an upper tube box, a tube sheet, a shell, a lower tube box, and heat exchange tubes. The tube sheet includes two parts: a fixed end and a floating end. , the upper tube box, the fixed end of the tube plate, the shell, and the lower tube box are fixedly connected by bolt fasteners in turn, the heat exchange tube is connected between the fixed end and the floating end of the tube plate, and the heat exchange tube is connected between the fixed end and the floating end of the tube plate. The heat pipe is a graphite+resin extruded or processed graphite pipe, and the lower part of the floating end of the tube plate is inserted into the lower tube box. the

The fixed end of the tube sheet and the shell are sealed with gaskets and O-rings, and the floating end and the shell are sealed with double O-rings or O-rings plus packing. the

Since the heat exchanger is used for heating, the heat exchange tube has also undergone a medium temperature treatment at 300°C. After the medium temperature treatment, the thermal stability and chemical stability of the pressure-shaped tube have been improved, and the linear expansion coefficient has been greatly reduced. , so it is most suitable for heat exchange tubes for heating. The layout of the heat exchange tubes on the tube sheet is arranged in an equilateral triangle, and the spacing between graphite tubes should be slightly larger than that of steel tube heat exchangers (generally recommended tube spacing: t=d ₀ +(7 ~9mm)). This can ensure that the maximum number of tubes can be obtained in a certain tube sheet area, and at the same time minimize the cross-sectional area of the space between the tubes to increase the flow rate of the shell side, thereby improving the heat transfer coefficient and ensuring the compactness of the heat exchanger.

Claims (3)

1. A large-scale tubular graphite heat exchanger structure, including an upper tube box (1), a tube sheet (2), a shell (3), a lower tube box (4), and a heat exchange tube (5). The plate (2) includes two parts, a fixed end and a floating end, the heat exchange tube (5) is connected between them, the fixed end of the tube plate (2) is connected to the upper tube box (1), the shell (3 ), fixedly connected by bolt fasteners, characterized in that: the lower part of the floating end of the tube plate (2) is inserted into the inside of the lower tube box (4). 2. The structure of large-scale graphite heat exchanger with tubes according to claim 1, characterized in that: the fixed end of the tube plate (2) and the shell (3) are sealed with gaskets and O-rings Sealing, the floating end and the housing (3) are sealed with double O-rings or O-rings plus packing. 3. The structure of large-scale tube-and-tube graphite heat exchanger according to claim 1, characterized in that: the arrangement of the heat exchange tubes on the tube sheet adopts an equilateral triangle or a rectangle arrangement.

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