CN2524204Y - Float pipe structure of steel-casing heat exchanger - Google Patents

Abstract

The utility model relates to a steel pipe shell floating pipe structure for the heat exchanger. The utility model is a single pipe filling sealing floating pipe structure; the sealing filling material separates the pipes of the heat exchanger with the shell medium; but the heat exchange pipe can move vertically to solve the stress problem that the enevenness of the heat expansion difference between the pipe and shell will cause the damage of the device. The working temperature of the heat exchanger surpasses five hundred degree centigrade attaching with spring stress to overcome the damage caused by the high temperature of the seal filling material. The heat exchanger has a long service life, a low producing cost and is convenient to be repaired.

Description

Steel tube shell type heat exchanger floating pipe type structure

Affiliated technical field

The utility model relates to the connected mode of a kind of steel tube shell type heat exchanger and tube sheet.

Technical background

At present, the steel tube shell type heat exchanger operating temperature that chemical industry is used improves constantly, traditional heat exchanger tube is weldingly fixed on the so-called fixed tube-sheet exchanger on the tube sheet of two ends, because the stress that the thermal expansion difference of tube bank and housing and the differential expansion of tube bank itself cause, cause the torsional deformation that tube bank is bigger, even cause that attachment weld ftractures prematurely between heat exchanger tube and the tube sheet, cause dielectric leakage, device damage, service life, average less than was 3 years, in order to address this problem, a kind of heat exchange equipment of single tube telescopic compensator structure that adopts has been introduced domestic, now realized production domesticization, Fig. 1 is the structure chart (data is drawn from 1991 the 3rd phases " carbon black industry ") of the single tube telescopic compensator of this heat exchanger employing.[1] is heat exchanger tube among the figure, and [2] are tube sheets, and [3] are bellowss, and [4] are inner protective tubes, and [5] are the horn mouth sheaths, and [6] are oversheaths, and [7] are dust rings.The lower end welding of the lower end of bellows [3] and inner protective tube [4], the lower end welding of the upper end of bellows and horn mouth pillar [5], the upper end of horn mouth sheath [5] and outer pillar [6] welding, this has just constituted the single tube telescopic compensator.The upper end of the inner protective tube of compensator upper end and outer pillar is welded on respectively on heat exchanger tube [1] and the tube sheet [2], the tube side of heat exchanger and shell side are just isolated next, when the heat exchanger tube longitudinal extension, the distortion of bellows has absorbed stroke, make tube sheet keep motionless, and the other end of heat exchanger tube is not stressed substantially with the weld seam that another tube sheet is connected, no matter this is to cause because of the thermal expansion difference of tube bank with housing if just having solved basically, still because of restraining the stress problem that self differential expansion causes, result of use is pretty good, work 5 years still intact substantially, embodied the superiority of the floating tubular construction of single tube telescopic compensator.But, the material of compensator bellows more special (Alloy625, Alloy800H), domestic rare production, price is very high, adds the technology more complicated of making this bellows, and processing charges is very high, two and get up, make the price of this single tube telescopic compensator higher.At present, the price of a compensator is more than 3200 yuan, a heat exchanger that has nearly 200 heat exchanger tubes, only the expense of one of compensator just is equivalent to two to three times of whole equipment manufacturing cost of traditional heat exchangers, the user is difficult to accept, in addition, maintenance is also inconvenient, and complicated formalities such as needing cutting, welding more replaces a part.

Summary of the invention

In order to overcome the higher and deficiency such as maintenance inconvenience etc. of above-mentioned compensator manufacturing cost, the utility model provides a kind of single tube packing seal floating pipe type structure, and this structure can not only satisfy the requirement of single tube flexible compensation, and service life and corrugated expansion joint are suitable, but manufacturing cost is lower, and is easy to maintenance.

The technical scheme that its technical problem that solves the utility model adopts is: at an end of every heat exchanger tube, put a packing seal box, the outside of packing seal box and tube sheet welding, the inner threading of packing seal box airtight and watertight padding, by gland its appropriateness is compressed, reach the purpose that intercepts heat exchanger tube side and shell side medium cross flow one, simplify the structure simultaneously.

The beneficial effects of the utility model are: packing seal box that is adopted and airtight and watertight padding etc. are formed by the material of its cheap market price, therefore, manufacturing cost is very low, the cost of each packing seal telescopic compensator only is equivalent to 1/tens of bellows telescopic compensator, service life is more than 5 years, and is easy to maintenance.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further specified.

Fig. 2 is the profile of first embodiment of the present utility model

Fig. 3 is the profile of second embodiment of the present utility model

[1] is heat exchanger tube among the figure, and [2] are tube sheets, and [13] are stuffing boxes, and [14] are airtight and watertight paddings, and [15], [25] are glands, and [26] are springs, and [27] are pressing plates.

The specific embodiment

Fig. 2 is first embodiment of the present utility model, and stuffing box [13] is welded on the tube sheet [2], and heat exchanger tube [1] is glanded the airtight and watertight padding that compresses and compresses, and intercepts heat exchanger tube side and shell side medium cross flow one.

Fig. 3 is second embodiment of the present utility model, stuffing box [13] is welded on the tube sheet [2], airtight and watertight padding [14] in the stuffing box is glanded [25] and compresses by spring [26] and pressing plate [27], intercept heat exchanger tube side and shell side medium cross flow one, when the design of heat exchanger preheat temperature is 500-900 ℃, the temperature of airtight and watertight padding can reach 300-500 ℃, airtight and watertight padding this moment will have certain scaling loss, adopt the spring pressure collocation structure for this reason, airtight and watertight padding is keep-uped pressure, intercept the cross flow one of heat exchanger tube side and shell side medium lastingly.

Claims (3)

1, a kind of steel tube shell type heat exchanger floating pipe type structure, by tube sheet, be connected heat exchanger tube on the tube sheet etc. and form, it is characterized in that: stuffing box is being overlapped in the heat exchanger tube outside, stuffing box is welded on the tube sheet, the medium of heat exchanger tube side and shell side is kept apart in the airtight and watertight padding that is extruded in the stuffing box, can not cross flow one;

2, steel tube shell type heat exchanger floating pipe type structure according to claim 1, it is characterized in that: airtight and watertight padding is glanded directly and compresses;

3, steel tube shell type heat exchanger floating pipe type structure according to claim 1, it is characterized in that: airtight and watertight padding is glanded by spring and pressing plate and compresses.

Images