CN103629954A

CN103629954A - Double-tube and double-tube-plate heat exchanger

Info

Publication number: CN103629954A
Application number: CN201210305689.XA
Authority: CN
Inventors: 朱晨; 刘莺歌; 曹海建; 王振政
Original assignee: FUNKE HEAT EXCHANGER SYSTEMS (CHANGZHOU) Co Ltd
Current assignee: FUNKE HEAT EXCHANGER SYSTEMS (CHANGZHOU) Co Ltd
Priority date: 2012-08-24
Filing date: 2012-08-24
Publication date: 2014-03-12

Abstract

The invention relates to an alarming-type double-tube and double-tube-plate heat exchanger which comprises a heat exchange tube, an intermediate medium tube, a first front tube plate, a second front tube plate, a first rear tube plate, a second rear tube plate and a shell. A cavity is formed between the first front tube plate and the second front tube plate, and a cavity is formed between the first rear tube plate and the second rear tube plate. The heat exchange tube is arranged in the intermediate medium tube in a nested mode. An intermediate medium cavity is formed between the outer tube wall of the heat exchange tube and the inner tube wall of the intermediate medium tube, the intermediate medium cavity is communicated with the cavity between the two front tube plates and the cavity between the two rear tube plates along the intermediate medium tube, an expansion tank is arranged on the wall of the cavity between the first rear tube plate and the second rear tube plate, and an alarm is arranged on the wall of the cavity between the first front tube plate and the second front tube plate. The double-tube and double-tube-plate heat exchanger can prevent leakage at the connecting positions of the heat exchange tube of the heat exchanger and the tube plates of the heat exchanger, when leakage occurs in the heat exchange tube, direct contact between a tube side medium of the heat exchanger and a shell side medium of the heat exchanger is avoided, and the alarm gives an alarm to prevent accidents.

Description

Two-tube double tube plate heat exchanger

Technical field

The present invention relates to a kind of pipe heat exchanger, after relating in particular to a kind of heat exchanger tube that can prevent heat exchanger and leaking, pipe side medium directly contacts with shell-side medium and reacts or two-tube double tube plate heat exchanger that medium pollutes mutually.

Background technology

Shell-and-tube heat exchanger is the common processing equipment of carrying out heat exchange operation, be widely used in the industrial departments such as chemical industry, oil, petrochemical industry, electric power, light industry, metallurgy, atomic energy, shipbuilding, aviation, heat supply, particularly, in petroleum refining and chemical processing equipment, occupy extremely important status.But shell-and-tube heat exchanger due to long-term operation, produce the reasons such as the unstable and concentration of medium of load exceeds standard and unavoidably can leak.At some, to pipe side medium and the mixing of shell-side medium, can cause the industry of the grave dangers such as blast and the industry occasion higher to environmental requirement, for example, as industries such as chemical industry, metallurgy, food, polysilicons, once leak, will cause irremediable life and property loss.

Enterprise is all also generally the concentration from controlling cooling medium, the Leakage probability that reinforcement repair and maintenance equal angles reduces heat exchanger aborning at present, substantially with the planned of cycled recondition, puts prevention first.Also the heat exchanger that seldom has on the market at present the tube bank of preventing specially to leak.

Summary of the invention

The object of this invention is to provide a kind of safe two-tube pipe heat exchanger, can effectively avoid the heat exchanger tube of heat exchanger to leak after pipe side medium directly contact with shell-side medium and produce the generation of the caused danger of chemical reaction or pollution.

Realizing technical scheme of the present invention is: comprise heat exchanger tube, the first front tube sheet, the second front tube sheet, the first back tube sheet, the second back tube sheet and shell wall; Between described the first front tube sheet and described the second front tube sheet, be provided with front pipe cavity, between described the first back tube sheet and described the second back tube sheet, be provided with rear pipe cavity; It is characterized in that: described heat exchanger tube includes outer tube and inner tube; It is inner that described inner tube is nested in described outer tube; Between described inner tube and described outer tube wall, form intermediate cavity; Described intermediate cavity connects with front pipe cavity, rear pipe cavity respectively mutually along outer tube; The chamber wall of described rear pipe cavity is provided with expansion drum.

Concrete, an alarm can be set on the wall of the chamber of front pipe cavity, when pipe side medium or shell-side dielectric leakage enter after intermediate cavity, along with the rising alarm of intermediate cavity pressure gives the alarm.

In order to reduce the use amount of the intermediate medium of intermediate cavity, save production cost, can front pipe cavity or after manage in cavity filler be set, because filler occupies certain cavity volume, relatively just reduced the use amount of intermediate medium.

Two-tube double tube plate heat exchanger provided by the invention, by being nested in, the inner tube of heat exchanger tube in outer tube, rely on the intermediate cavity forming between inner and outer pipes to make to manage side medium and shell-side medium is separated, can effectively prevent the pipe side medium of heat exchanger with after shell-side dielectric leakage because directly contacting chemical reaction and the pollution producing, at some, to pipe side medium and the mixing of shell-side medium, can cause the industry of the grave dangers such as blast and the industry occasion higher to environmental requirement, there is good application prospect.

Accompanying drawing explanation

For content of the present invention is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation below.

Fig. 1 is the main cutaway view of two-tube double tube plate heat exchanger.

Fig. 2 is the top view of two-tube double tube plate heat exchanger.

Fig. 3 is the enlarged drawing at I place in the main cutaway view of two-tube double tube plate heat exchanger.

Fig. 4 is the II place enlarged drawing in the top view of two-tube double tube plate heat exchanger.

Fig. 5 is the III place enlarged drawing of the top view of two-tube double tube plate heat exchanger.

Fig. 6 be heat exchanger tube and intermediate medium pipe as a whole with the expanded joint schematic diagram of the second front tube sheet.

Fig. 7 be heat exchanger tube and intermediate medium pipe as a whole with the expanded joint schematic diagram of the first back tube sheet.

Wherein, 1 pipe side-entrance, 2 first front tube sheets, 3 front pipe cavitys, 4 second front tube sheets, 5 shell-side outlets, 6 shell walls, 7 heat exchanger tubes, 7-1 inner tube, 7-2 outer tube, 7-3 intermediate cavity, 8 boss, 9 shell-side inlet, 10 fillers, 11 second back tube sheets, 12 rear pipe cavitys, 13 first back tube sheets, 14 draining switch, 15 bases, 16 pipe side outlets, 17 alarms, 18 expansion drums.

The specific embodiment

See Fig. 1, the present invention has heat exchanger tube 7, the first front tube sheet 2, the second front tube sheet 4, the first back tube sheet 13, the second back tube sheet 11 and shell wall 6; Between described the first front tube sheet 2 and described the second front tube sheet 4, be provided with front pipe cavity 3, between described the first back tube sheet 13 and described the second back tube sheet 11, be provided with rear pipe cavity 12; Described heat exchanger tube 7 includes outer tube 7-2 and inner tube 7-1; It is inner that described inner tube 7-1 is nested in described outer tube 7-2; Between described inner tube 7-1 and described outer tube 7-2 tube wall, form intermediate cavity 7-3; Described intermediate cavity 7-3 connects with front pipe cavity 3, rear pipe cavity 12 respectively mutually along outer tube 7-2; The chamber wall of described rear pipe cavity 12 is provided with

expansion drum

18,18 li of expansion drums are equipped with a certain amount of intermediate medium, be used for managing backward cavity 12, intermediate cavity 7-3 and front pipe cavity 3 intermediate medium is provided, the pipe side medium of heat exchanger is at inner tube 7-1 inner fluid like this, between pipe side medium and shell-side medium, by the intermediate medium in intermediate cavity 7-3, cut off, avoided leaking or manage when outer tube 7-2 leaks as inner tube 7-1 the possible chemical reaction that side medium and shell-side medium directly contact rear generation.

In addition, in order to guarantee the heat transfer uniformity of the intermediate medium in intermediate cavity 7-3, it is coaxial that inner tube 7-1 and outer tube 7-2 keep, and intermediate medium is evenly distributed in intermediate cavity 7-3 like this, keeps heat transfer balance.

In order to make heat exchanger staff after leakage can obtain in time relevant information, on the wall of the chamber of front pipe cavity 3, be provided with alarm 17, when the tube wall of inner tube 7-1 or outer tube 7-2 breaks, the pipe medium of side or the medium of shell-side can enter in intermediate cavity 7-3 with breach, along with constantly overflowing into of the external medium of intermediate cavity 7-3, pressure in intermediate cavity 7-3 can increase, when pressure is increased to the rated pressure of pre-set alarm 17, alarm 17 work give the alarm, and remind attendant to hasten to process leakage accident.

Inner tube 7-1 is connected with the first back tube sheet 13 expanded joints with the second front tube sheet 4 respectively as a whole with outer tube 7-2, has guaranteed that the tube bank of heat exchanger is in the sealing at the second front tube sheet 4 and the first back tube sheet 13 places; Simultaneously in order to reduce the use amount of expansion drum 18 interior intermediate mediums, reduce production costs, front pipe cavity 3 or after manage in cavity 12, be furnished with for example solid piece of polyurethane of some filler 10(), because filler 10 has occupied the certain volume of cavity, the use amount of intermediate medium is obviously reduced, for fear of filler 10, flow in intermediate cavity 7-3 and affect the heat exchange of inner tube 7-1 and shell-side medium in addition, the minimum dimension of filler 10 should be greater than the size of intermediate cavity 7-3.

It is for allowing manufacturer stick the Product labelling of our factory and the technical parameter of heat exchanger that shell wall 6 is provided with boss 8; Shell wall 6 bottoms are provided with draining switch 14 and are used for discharging the liquid in heat exchanger shell chamber.

In use procedure, pipe side medium flows out from pipe side outlet 16 through heat exchange from pipe side-entrance 1 enters, and shell-side medium enters through heat exchange and flows out from shell-side outlet 5 from shell-side inlet 9; Select a kind of being difficult for and pipe side medium and the aitiogenic intermediate medium of shell-side medium; intermediate medium is circulated in whole intermediate cavity 7-3 by expansion drum 18; the protection of many middle dielectric layers in intermediate cavity between medium in medium in inner tube 7-1 and heat exchanger shell chamber like this; medium while having avoided leaking in shell chamber contacts with the direct of medium in inner tube 7-1, and pipe side medium and shell-side medium are realized the exchange of heat indirectly by the heat transmission of intermediate medium.In addition, in expansion drum 18, because there is in advance a certain amount of intermediate medium, the intermediate medium consumption in intermediate cavity 7-3 can make up while reducing at any time.

Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. a two-tube double tube plate heat exchanger, comprises heat exchanger tube (7), the first front tube sheet (2), the second front tube sheet (4), the first back tube sheet (13), the second back tube sheet (11) and shell wall (6); Between described the first front tube sheet (2) and described the second front tube sheet (4), be provided with front pipe cavity (3), between described the first back tube sheet (13) and described the second back tube sheet (11), be provided with rear pipe cavity (12); It is characterized in that: described heat exchanger tube (7) includes outer tube (7-2) and inner tube (7-1); Described inner tube (7-1) is nested in described outer tube (7-2) inside; Between described inner tube (7-1) and described outer tube (7-2) tube wall, form intermediate cavity (7-3); Described intermediate cavity (7-3) connects with front pipe cavity (3), rear pipe cavity (12) respectively mutually along outer tube (7-2); The chamber wall of described rear pipe cavity (12) is provided with expansion drum (18); The chamber wall of described front pipe cavity (3) is provided with alarm (17); Described front pipe cavity (3) or after manage and in cavity (12), be furnished with some fillers (10).

2. a kind of two-tube double tube plate heat exchanger according to claim 1, is characterized in that: described inner tube (7-1) and described outer tube (7-2) are coaxial.

3. the two-tube double tube plate heat exchanger of a kind of alarm type according to claim 1, is characterized in that: described inner tube (7-1) is connected with described the first back tube sheet (13) expanded joint with described the second front tube sheet (4) respectively as a whole with described outer tube (7-2).

4. a kind of two-tube double tube plate heat exchanger according to claim 1, is characterized in that: the minimum dimension of described filler (10) is greater than the size of intermediate cavity (7-3).

5. according to a kind of two-tube double tube plate heat exchanger described in claim 1 or 4, it is characterized in that: described filler (10) is the solid piece of polyurethane.

6. a kind of two-tube double tube plate heat exchanger according to claim 1, is characterized in that: described shell wall (6) is provided with boss (8).

7. a kind of two-tube double tube plate heat exchanger according to claim 1, is characterized in that: described shell wall bottom is provided with draining switch (14).