CN204255146U - Sleeve pipe for heat exchange is restrained - Google Patents

Abstract

A casing tube bundle for heat exchange, which is mainly composed of straight tubes. The technical solution adopted to solve its technical problems is that the casing tubes for heat exchange have a double-layer structure, and the inner tube and the outer tube are both smooth tubes. Several sets of support plates are arranged in the annular gap between the tubes; the inner tube, the outer tube and the support plate form a sleeve assembly, and several sleeve assemblies form a heat exchange sleeve tube bundle; two cold fluid tube boxes are arranged outside the nozzles at both ends of the inner tube, The cold fluid pipe box and the inner hole of the inner pipe form a cold fluid channel, and the two cold fluid pipe boxes are respectively provided with a cold fluid inlet and a cold fluid outlet; the annular space between the inner and outer pipes constitutes a hot fluid annular channel, and the two sides An annular tube box is set at the end, the hot fluid inlet is set at the upper part of the casing tube bundle, and the hot fluid outlet is set at the lower part of the casing tube bundle; if air is used as the cold fluid, the hot fluid goes through the annular gap channel, and the inner tube goes through the cooling water; The outside of the outer tube can strengthen the heat transfer outside the tube by spraying water and evaporating. The heat exchange efficiency of the hot and cold fluids is improved by adopting the casing tube bundle.

Description

Tube bundles for heat exchange

technical field

The utility model relates to the field of heat exchange equipment, in particular to a casing tube bundle.

Background technique

The existing tube bundle heat exchange device is composed of a plurality of single tubes, and the cold fluid is inside or outside the tubes, exchanging heat with the partition wall of the hot fluid. Generally speaking, the heat transfer coefficient inside the tube is larger, and the heat transfer coefficient outside the tube is smaller; the heat transfer coefficient inside the tube of the thin tube is larger, but for the thicker outer tube, in the state of the art without inserting the inner tube, the outer The center of the hot fluid in the tube is the center of the outer tube, and the distance from the center of the hot fluid to the boundary of the cold source is the radius of the outer tube. The larger the radius of the hot fluid in the thicker tube, the smaller the heat transfer coefficient; While transferring heat outside the tube, the heat transfer efficiency inside the thick tube is enhanced.

Contents of the invention

The purpose of this utility model is to provide a casing tube bundle for heat exchange, so as to solve the above-mentioned problems in the prior art.

The utility model is mainly composed of straight pipes. The technical solution adopted to solve the technical problems is that the sleeve pipe for heat exchange is a double-layer structure. A set of support plates; the inner tube, the outer tube and the support plate form a sleeve assembly, and several sleeve assemblies form a heat exchange sleeve tube bundle; two cold fluid tube boxes are arranged outside the nozzles at both ends of the inner tube, and the cold fluid tube box and the inner hole of the inner tube The cold fluid channel is formed, and the cold fluid inlet and the cold fluid outlet are respectively arranged on the two cold fluid pipe boxes; The fluid inlet is arranged on the upper part of the casing tube bundle, and the hot fluid outlet is arranged on the lower part of the casing tube bundle;

If air is used as the cold fluid, the hot fluid will go through the annular gap channel, and the inner tube will go through the cooling water; the outside of the outer tube can be sprayed and evaporated to enhance heat transfer outside the tube.

Each group of the supporting boards is 2-4 pieces, arranged longitudinally and symmetrically at intervals.

The positive effect of the utility model is that after the inner pipe is inserted, the annulus of the inner and outer pipes is much smaller than the radius of the outer pipe, and the center of the thermal fluid in the annulus is at the half annulus. The distance from the center of the hot fluid to the cold fluid outside the tube decreases sharply from the radius of the outer tube to the semi-annulus, and the distance from the center of the hot fluid to the cold fluid in the inner tube also decreases sharply from the radius of the outer tube to the semi-annulus. Therefore, the temperature gradient between the cold and heat sources is significantly increased, the heat transfer power is also significantly increased, and the heat transfer is also significantly increased. This is the reason why the casing enhances the heat transfer in the tube. By adopting the casing tube bundle, the heat exchange efficiency of the cold and hot fluids is greatly improved.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is A-A sectional view.

In the figure: 1 cooling water tank, 2 annular gap channel, 3 annular gap tube box, 4 cooling water inlet, 5 outer pipe, 6 support plate, 7 cooling water channel, 8 inner pipe, 9 thermal fluid inlet, 10 thermal fluid outlet, 11 Cooling water outlet.

Detailed ways

As shown in the figure: the casing tube bundle used for condensing steam, the heat exchange casing is a double-layer structure, and several sets of support plates 6 are arranged in the ring gap between the inner and outer tubes, and the inner tube 8, the outer tube 5, and the support plate 6 form a set Tube assembly, a number of casing assemblies form a casing tube bundle, and cooling water pipe boxes 1 are respectively arranged at the nozzles at both ends of the inner pipe 8 of the casing. The cooling water inlet 4 and the cooling water outlet 11 are respectively arranged on the water pipe box 1; the annular gap space between the inner pipe 8 and the outer pipe 5 is the steam annular gap channel 2, and the annular gap tube box 3 is arranged at both ends of the annular gap channel 2, The thermal fluid inlet 9 is arranged at the upper part of the casing tube bundle, and the thermal fluid outlet 10 is arranged at the lower part of the casing tube bundle. Each group of support plates 6 is 2-4 pieces, arranged longitudinally and symmetrically at intervals; the outside of the outer tube is evaporated by spraying water falling film to strengthen the heat transfer outside the tube.

Claims (3)

1. the sleeve pipe for heat exchange is restrained, and primarily of straight tube composition, it is characterized in that: the sleeve pipe for heat exchange is double-decker, and interior pipe, outer tube are light pipe, and the annular space between inner and outer pipes arranges some groups of gripper shoes; Interior pipe, outer tube and gripper shoe composition thimble assembly, the tube bank of some thimble assembly composition heat exchange sleeve; Arrange two cold fluid bobbin carriages outside the mouth of pipe of interior pipe two ends, cold fluid bobbin carriage and interior pipe orifice form cold fluid pass, and two cold fluid bobbin carriages arrange cold fluid import and cold fluid outlet respectively; Annular space space between inner and outer pipes forms hot fluid annular space passage, and the two ends of annular space passage arrange annular space bobbin carriage, the bottom that hot fluid import is arranged on the top of sleeve pipe tube bank, hot fluid outlet ports is arranged on sleeve pipe tube bank.

2. the sleeve pipe for heat exchange according to claim 1 is restrained, and it is characterized in that: described gripper shoe is often organized as 2-4 sheet, and longitudinally symmetrical interval is arranged.

3. the sleeve pipe for heat exchange according to claim 1 is restrained, and it is characterized in that: if the tube bank of described sleeve pipe is cold fluid with air, then hot fluid walks annular space passage, and cooling water walked by interior pipe; The outside of outer tube is carried out enhanced tube by trickle evaporation and is conducted heat outward.