CN2328968Y

CN2328968Y - Double pipe bundle composite heat exchanger

Info

Publication number: CN2328968Y
Application number: CN 98221336
Authority: CN
Inventors: 刘志林
Original assignee: JINAN COOL AND HEATING EQUIPMENT FACTORY
Current assignee: JINAN COOL AND HEATING EQUIPMENT FACTORY
Priority date: 1998-06-01
Filing date: 1998-06-01
Publication date: 1999-07-14
Anticipated expiration: 2008-06-01

Abstract

The utility model relates to a double-pipe-bundle composite heat exchanger, which solves the problems of low heat-exchanging efficiency and large volume in a pipe-casing heat exchanger. The utility model is characterized in that a partition board is arranged between an upper casing and a lower casing; the partition board, the upper casing and the lower casing are fastened together through screw bolts; a pipe bundle I and a pipe bundle II are arranged respectively in the upper casing and in the lower casing; the pipe bundle I is fixed on a coal-heating inlet pipe and a coal-heating communicating pipe, and the pipe bundle I is communicated with the heating medium inlet pipe and the heating medium communicating pipe; the pipe bundle II is fixed on a coal-cooling inlet pipe and a coal-cooling communicating pipe; the coal-heating communicating pipe and the coal-cooling communicating pipe are respectively communicated with the inner cavities of the upper casing and the lower casing. The heat exchanger, which can be used as a steam-to-water heat exchanger, and can also be used as a water-to-water heat exchanger, has the advantages of high heat-exchanging efficiency and small volume.

Description

The compound heat exchanger of two-tube bundle

The utility model relates to a kind of shell-and-tube heat exchanger, the compound heat exchanger of particularly a kind of two-tube bundle.

Present heat exchanger is broadly divided into three classes by structural shape: the one, and spiral heat exchanger, the 2nd, plate type heat exchanger, the 3rd, shell-and-tube heat exchanger.Though wherein its heat transfer coefficient of spiral heat exchanger and plate type heat exchanger is bigger, heat exchange efficiency is higher, and there is complex structure in they, easily leaks problems such as maintenance difficult.Though the shell-and-tube heat exchanger structure is simpler, easy-maintaining, it exists heat transfer coefficient little again, and heat exchange efficiency is low, bulky problem, and in straight tubular heat exchanger, also have the bigger problem of thermal stress.

The purpose of this utility model is the problem that exists at shell-and-tube heat exchanger, provides a kind of heat exchange efficiency height, the heat exchanger that volume is less.

The technical solution of the utility model is: it has housing, hot coal inlet pipe, cold coal inlet pipe, hot coal outlet, cold coal export and sewage draining exit, its feature is that its housing is divided into upper shell and lower house, dividing plate is arranged between upper and lower casing, and the three with bolted together; In the inner chamber of upper shell, the tube bank I that is made of one group of pipe is arranged, the two ends of each root pipe wherein are cemented in respectively on hot coal inlet pipe and the hot coal cross over pipe, and communicate with them; In lower housing cavity, the tube bank II that is made of one group of pipe is arranged, the two ends of each root pipe wherein are cemented in respectively on cold coal inlet pipe and the cold coal cross over pipe, and communicate with them; Hot coal cross over pipe upper end closed, the lower end communicates with lower housing cavity, cold coal cross over pipe lower end closed, the upper end communicates with the upper shell inner chamber.

In order to make the heat exchanger structure compactness, increase heat exchange area, improve heat exchange efficiency, the pipe in tube bank I and the tube bank II is the coil pipe that is shaped as Archimedes spiral.

In order to reduce the resistance that fluid flows in upper and lower casing, increase the heat radiation length of coil pipe, also make and arrange attractive in appearancely, be convenient to construction, the coil pipe in tube bank I and the tube bank II is up and down and is arranged in parallel.

The two-stage heat exchange is arranged in the utility model, and first order heat exchange is at the upper shell inner chamber.The hot coal MEDIA FLOW that is flowed into by the hot coal inlet pipe is through the tube bank I, and heating tube is outer to flow into the cold coal medium that has heated up in the upper shell inner chamber by cold coal cross over pipe; Second level heat exchange is to be flow into by the hot coal cross over pipe to have let slip the heating of some hot hot coal media in the lower housing cavity and flow into cold coal medium in the tube bank II by cold coal inlet pipe.Such design has guaranteed to have the rational temperature difference between the hot coal medium and cold coal medium in the I and II heat transfer process, has improved whole heat exchange efficiency.Moreover because in the utility model, tube bank I and tube bank II constitute by many pipes, can select suitable tubular shape and length, as pipe is curved shaped form, arrange by certain way and to strengthen heat exchange area.Particularly when tubular shape is the coil pipe of Archimedes spiral, its length is long, in upper and lower casing, laterally spiral, coil pipe is dispersed throughout in the upper and lower casing, and outer cold coal or the hot coal medium of pipe is to flow along the space between the space between coil pipe and tube bank I, II and upper and lower casing, therefore total heat exchange area is bigger, thereby heat exchange is full and uniform.In addition, hot coal that flows and cold coal medium have increased the exothermic coefficient in the outside in the pipe, thereby have increased its heat transfer coefficient in the inside and outside mobile turbulent condition that is of pipe, and heat transfer coefficient can reach 3000-5000W/m ², k, everything all makes and the utlity model has high heat exchange efficiency.According to as can be known above-mentioned, because the inner heat exchange area of the utility model is big, the heat exchange efficiency height, the itself structure is very compact again, so it is than the little 1/3-1/2 of volume of the shell-and-tube heat exchanger of same specification, and cost is low.In addition, in the utility model, the two ends of every coil pipe are fastening, and the pipe shaft helical spirals and dangles, so thermal stress is very little.And the effect lower coil pipe at extratubal fluid produces vibration, thereby has destroyed boundary-layer, has alleviated fouling.In the utility model, the hot coal medium can be steam, also can be hot water, and cold coal medium is a water.Therefore, the utility model can be used as vapor-water heat exchanger, also can be used as the water water-to-water heat exchanger.

Accompanying drawing 1 is a cutaway view of the present utility model;

Accompanying drawing 2 is an A-A profile of the present utility model;

Accompanying drawing 3 is a B-B profile of the present utility model.

Below in conjunction with accompanying drawing the utility model is described in detail.

As can be seen from Figure 1, a dividing plate 3 is arranged between upper shell 1 and the lower house 2, upper and lower casing and dividing plate 3 are in the same place with bolted by flange.Cold coal export 4 and gauge port 5 are arranged on the top of upper shell 1.Hot coal inlet pipe 6 enters inner chamber from upper shell 1 top, endplate 3 is with its sealing under it, the tube bank I that the coil pipe 7 that has 20 rows to be arranged in parallel up and down in upper shell 1 inner chamber constitutes, 2 as can be seen in conjunction with the accompanying drawings, the coil pipe 7 of tube bank in 1 be shaped as Archimedes spiral, its two ends are welded knot respectively on hot coal inlet pipe 6 and hot coal cross over pipe 8, and communicate with them.The upper end closed of hot coal cross over pipe 8, lower end pass dividing plate 3 and communicate with lower house 2 inner chambers.Sewage draining exit 9 and hot coal outlet 10 is arranged in the lower end of lower house 2.Cold coal inlet pipe 11 enters inner chamber from the bottom of lower house 2, and dividing plate 3 is with cold coal pipe 11 upper end closeds.The tube bank II that is made of 6 coil pipes 12 that are arranged in parallel up and down of row is arranged in lower house 2 inner chambers.In conjunction with Fig. 3 as can be seen, in the tube bank II coil pipe 12 be shaped as Archimedes spiral, its two ends weldering knot and communicates with them on cold coal inlet pipe 11 and cold coal cross over pipe 13.The lower end closed of cold coal cross over pipe 13, upper end are passed dividing plate 3 and are communicated with upper shell 1 inner chamber.

When the utility model used, hot coal medium steam or hot water flowed into from hot coal inlet pipe 6, enter lower house 2 inner chambers by tube bank I and hot coal cross over pipe 8, export 10 outflow heat exchangers from hot coal at last.Cold coal medium cold water flows into from cold coal inlet pipe 11, enters upper shell 1 inner chamber by tube bank II and cold coal cross over pipe 13, at last from cold coal export 4 outflow heat exchangers.

Claims

1, the compound heat exchanger of a kind of two-tube bundle, it has housing, hot coal inlet pipe, cold coal inlet pipe, hot coal outlet, cold coal export and sewage draining exit, the housing that it is characterized in that it is divided into upper shell and lower house, and dividing plate is arranged between upper and lower casing, and the three with bolted together; The tube bank I that is made of one group of pipe is arranged in the inner chamber of upper shell, and the two ends of each root pipe wherein are cemented in respectively on hot coal inlet pipe and the hot coal cross over pipe, and communicate with them; In lower housing cavity, the tube bank II that is made of one group of pipe is arranged, the two ends of each root pipe wherein be cemented in respectively cold coal inlet pipe and and cold coal cross over pipe on, and communicate with them; Hot coal cross over pipe upper end closed, the lower end communicates with lower housing cavity, cold coal cross over pipe lower end closed, the upper end communicates with the upper shell inner chamber.

2, the compound heat exchanger of two-tube bundle according to claim 1 is characterized in that the pipe of restraining in I and the tube bank II is the coil pipe that is shaped as Archimedes spiral.

3, the compound heat exchanger of two-tube bundle according to claim 2 is characterized in that restraining coil pipe in I and the tube bank II and is up and down and is arranged in parallel.