CN210892797U

CN210892797U - U-shaped tubular heat exchanger tube box structure

Info

Publication number: CN210892797U
Application number: CN201921546153.0U
Authority: CN
Inventors: 刘家曦; 任超
Original assignee: Hualu Engineering and Technology Co Ltd
Current assignee: Hualu Engineering and Technology Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-30
Anticipated expiration: 2029-09-17

Abstract

The utility model discloses a U-shaped tubular heat exchanger tube case structure, through setting up the independent chamber of a tub hot-fluid import, use fountain formula stringing, cold fluid guider, special adiabatic structure, with the direct leading-in central heat exchange tube of tube sheet of hot-fluid, prevent hot-fluid and the contact of tub case casing, the cold fluid that comes out from the heat exchange tube of tube sheet edge simultaneously flows the central heat exchange tube of tube sheet by guider, finally get into tub case, the tub case casing has both been cooled, the central heat exchange tube of tube sheet has also been cooled, reach and reduce U-shaped tubular heat exchanger tube side design temperature, balanced tube sheet temperature distribution's purpose.

Description

U-shaped tubular heat exchanger tube box structure

Technical Field

The utility model relates to a U-shaped tubular heat exchanger tube case structure.

Background

The U-shaped tube heat exchanger is a heat exchange device widely applied to the industries of chemical industry, nuclear energy, metallurgy and the like. The reason for the wide use of the equipment is that the tube bundle can freely stretch out and draw back, the structure is relatively simple, temperature difference stress can not be generated due to medium temperature difference, and the reliability is good under the working conditions of high temperature and high pressure.

In a common two-tube pass or multi-tube pass heat exchanger, different tube passes are often arranged from top to bottom or from bottom to top, which causes the temperature of a tube plate, a tube box and a heat exchange tube to be changed in a step shape, and causes a local high temperature or a local low temperature to occur in a certain area of the tube plate, the tube box and the heat exchange tube. If the temperature distribution of the tube plate is not uniform, the stress of the tube plate is not uniform, a simplified model during tube plate calculation is greatly different from the actual situation, and the tube plate, the tube box and the heat exchange tube are required to bear stress caused by pressure, so that unexpected damage can be caused to local parts of the tube plate, the tube box and the heat exchange tube.

However, as the operating temperature of the medium rises, the maximum stress that the material can bear is continuously reduced, and at this time, the equipment needs to increase the wall thickness to bear the internal pressure, which not only increases the difficulty of the equipment processing and manufacturing, increases the cost of the equipment, but also reduces the reliability of the equipment, so that how to make the U-shaped tube heat exchanger for processing the high-temperature medium work at a lower temperature, and the problem of balancing the temperature distribution of the tube box and the tube plate is very important.

The utility model discloses solution U-shaped tubular heat exchanger tube side operation high temperature problem that can be fine reduces the difference in temperature between the different regions of tube sheet simultaneously, has further expanded U-shaped tubular heat exchanger's application scope, has strengthened the reliability that this kind of equipment used under extreme environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a U-shaped tubular heat exchanger tube case structure can reduce U-shaped tubular heat exchanger tube side design temperature, and balanced tube sheet temperature distribution effectively reduces the operating temperature of tube case. The structure can be used in all occasions that the temperature of the tube side medium is higher than that of the shell side medium.

The technical scheme of the utility model is that: a U-shaped tube type heat exchanger tube box structure comprises three parts,

the first part is an independent cavity which is composed of a plurality of sections of shells and directly connected with a hot fluid inlet pipe of a pipe box and a heat exchange pipe at the center of a pipe plate, and the independent cavity is provided with a displacement compensation device to ensure that the independent cavity cannot be damaged due to excessive temperature difference stress under extreme temperature difference; high-temperature hot fluid directly enters the independent cavity from the hot fluid inlet pipe of the pipe box, so that the hot fluid is prevented from contacting with the pipe box shell;

the second part is in a fountain type U-shaped heat exchange tube arrangement form, the U-shaped heat exchange tubes are divided into heat exchange tubes at the centers of the tube plates and heat exchange tubes at the edges of the tube plates, the U-shaped heat exchange tubes are bent from inside to outside, each U-shaped heat exchange tube is respectively connected with a heat exchange tube hole at the center of the tube plate and a heat exchange tube hole at the edge of the tube plate, and the bent tube area at the tail end of the U-shaped tube bundle is in a; in the tube distribution mode, all hot fluid flows into the heat exchange tubes at the centers of the tube plates, and cold fluid after heat exchange flows out of the heat exchange tubes at the edges of the tube plates;

the third part is a cold fluid guiding device which is arranged between a heat exchange tube at the center of the tube plate and a heat exchange tube at the edge of the tube plate and just covers the heat exchange tube at the edge of the tube plate, the device constructs a three-quarter ring annular flow channel, a gap of the remaining quarter ring is vertically upward, cold fluid flows out from the gap to ensure that the cold fluid fully cools a tube box shell, and inner baffles are arranged on two sides of the annular flow channel, which are perpendicular to the gap.

Preferably, the heat exchange tube end part at the center of the tube plate is filled with a heat insulation layer at the end part of the central heat exchange tube, and the heat insulation layer at the end part of the central heat exchange tube is pressed by a pressing plate to ensure the heat insulation effect.

Preferably, an inner sleeve of the heat exchange tube is arranged in the heat exchange tube at the center of the tube plate, and the outer diameters of the two ends of the inner sleeve of the heat exchange tube are larger than the outer diameter of the middle of the inner sleeve of the heat exchange tube, so that a certain gap is reserved between the inner surface of the heat exchange tube at the center of the tube plate and the outer surface of the inner sleeve of the heat exchange tube, and heat insulation materials are filled in the gap to form a.

Preferably, a thermal fluid inlet insulation layer is arranged inside the thermal fluid inlet pipe of the tube box to prevent local high temperature of the inlet pipe.

The utility model provides a pair of U-shaped tubular heat exchanger tube case structure, through setting up the independent chamber of a tub hot-fluid import, use fountain formula stringing, cold fluid guider, special adiabatic structure, with the direct leading-in central heat exchange tube of tube sheet of hot-fluid, prevent hot-fluid and tub contact of case casing, the cold fluid that comes out from the marginal heat exchange tube of tube sheet simultaneously flows the central heat exchange tube of tube sheet by guider, finally get into a tub case, the case casing of tube sheet has both been cooled, the central heat exchange tube of tube sheet has also been cooled, reach and reduce U-shaped tubular heat exchanger tube side design temperature, balanced tube sheet temperature distribution's purpose.

Drawings

FIG. 1 is a schematic view of a tube box, tube sheet, and tube bundle configuration.

FIG. 2 is a schematic view of the thermal insulation of the inlet of the header hot fluid.

Fig. 3 is a side view of a cold fluid guide.

Fig. 4 is a schematic view of the heat exchange tube insulating structure in the central region of the tube sheet (enlarged view of region a in fig. 3).

FIG. 5 is a schematic view of the inside and outside area of the heat exchange tube.

Fig. 6 is a front view of the cold fluid guide.

Fig. 7 is a schematic view of a fountain type pipe distribution part of a heat exchange pipe penetrating.

Reference numerals: 1-independent cavity access hole, 2-tube box shell, 3-displacement compensation device, 4-tube box hot fluid inlet pipe, 5-independent cavity, 6-tube plate, 7-tube bundle, 8-tube bundle bend section, 9-tube box cold fluid outlet pipe, 10-hot fluid inlet heat insulation layer, 11-cold fluid guide device, 12-tube plate center heat exchange tube, 13-tube plate edge heat exchange tube, 14-pressing plate, 15-heat exchange tube inner sleeve, 16-center heat exchange tube end heat insulation layer, 17-center heat exchange tube inner heat insulation layer and 18-guide device inner baffle.

Detailed Description

The contents of the present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, a tube box structure of a U-shaped tube heat exchanger includes three parts:

the first part is an independent cavity 5 which is composed of a plurality of sections of shells and directly connected with a heat fluid inlet pipe 4 of a pipe box and a heat exchange pipe 12 at the center of the pipe plate, and the independent cavity 5 is provided with a displacement compensation device 3 to ensure that the independent cavity 5 is not damaged due to excessive temperature difference stress generated under extreme temperature difference. High-temperature hot fluid directly enters the independent cavity 5 from the hot fluid inlet pipe 4 of the tube box, and the hot fluid inlet pipe 4 of the tube box is directly connected with the independent cavity 5, so that the hot fluid is prevented from contacting with the tube box shell 2.

The second part is in a fountain type U-shaped heat exchange tube distribution tube form. Conventional U-tube heat exchangers are typically split into different passes from the centerline of the tube sheet 6, with the U-tubes being bent across the centerline of the tube sheet. And the utility model discloses be divided into inside and outside two journey with the U-shaped heat exchange tube, as shown in fig. 3, be tube sheet center department heat exchange tube 12 and tube sheet edge heat exchange tube 13 respectively, the U-shaped heat exchange tube is by interior curved system outward that sends, and a tube sheet center heat exchange tube hole and tube sheet edge heat exchange tube hole are connected respectively to every U-shaped pipe. If viewed from the bend 8 at the end of the tube bundle 7, it is clear that the bend 8 appears fountain-like, as shown in fig. 7. In this tube arrangement, all hot fluid flows into the heat exchange tubes 12 at the center of the tube sheet, and the cold fluid after heat exchange flows out from the heat exchange tubes 13 at the edge of the tube sheet.

The third part is a cold fluid guiding device 11, as shown in fig. 3 and 5, which is installed between the heat exchange tube 12 at the center of the tube plate and the heat exchange tube 13 at the edge of the tube plate, and just covers the heat exchange tube 13 at the edge of the tube plate. The arrangement creates a three-quarter turn annular flow passage as shown in figure 6, with the remaining one-quarter turn gap facing vertically upward, from which the cold fluid flows out, ensuring that the cold fluid cools the header housing 2 sufficiently. The annular flow channel is provided with inner baffles 18 at two sides perpendicular to the gap, so that the cold fluid of the lower half circle flows through the gap of the heat exchange tube 12 at the center of the tube plate, and the purpose of further cooling the heat exchange tube is achieved.

Inside the tube box thermal fluid inlet 4 is provided a thermal fluid inlet insulation 10, which prevents local high temperatures in the inlet, as shown in fig. 2.

Independent chamber 5 is provided with displacement compensation arrangement 3, and the compensation is by the displacement that the difference in temperature arouses to set up independent chamber access hole 1, guarantee to overhaul under the prerequisite of not dismantling independent chamber 5.

As shown in fig. 4, a thermal fluid flows in from the heat exchange tube 12 at the center of the tube plate to exchange heat with a shell-side medium, an inner sleeve 15 of the heat exchange tube is arranged inside the heat exchange tube 12 at the center of the tube plate, and the outer diameters of both ends of the inner sleeve are larger than the outer diameter of the middle of the inner sleeve, so that a certain gap is left between the inner surface of the heat exchange tube 12 at the center of the tube plate and the outer surface of the inner sleeve 15 of the heat exchange tube, and the gap is filled with a thermal insulation. The end part of the heat exchange tube 12 at the center of the tube plate is filled with a heat insulating layer 16 at the end part of the central heat exchange tube, and the heat insulating layer 16 at the end part of the central heat exchange tube is pressed by a pressing plate 14, so that the heat insulating effect is ensured.

High-temperature hot fluid directly enters the independent cavity 5 from the hot fluid inlet pipe 4 of the tube box, all the hot fluid flows into the heat exchange pipes 12 in the center of the tube plate to exchange heat with a shell-side medium, the hot fluid after heat exchange with the shell side is cooled to become cold fluid, the cold fluid is folded by the U-shaped pipes and returns to the tube box, the cold fluid flows out of the tube box from the heat exchange pipes 13 at the edge of the tube plate and enters the cold fluid guide device 11, and the cold fluid flows out of a gap at the upper part of the guide device and then enters the tube box again, so that.

Due to the existence of the inner baffle 18, the cold fluid of the lower half circle of the guide device flows through the gap of the heat exchange tube 12 at the center of the tube plate, and the purpose of further cooling the heat exchange tube is achieved.

The utility model discloses can separate the hot-fluid that gets into the pipe case from the pipe case, directly introduce the heat exchange tube with the hot-fluid by the entrance, carry out the heat transfer with the shell side medium, the cold flow body after the cooling returns the tube side, further cools off the pipe case to greatly reduced the operating temperature of pipe case, made the temperature distribution of tube sheet and pipe case more even simultaneously.

Only a small part of areas in contact with the hot fluid, such as an independent cavity and a heat exchange tube at the center of a tube plate, need to consider the influence of high temperature, and the areas are positioned in the tube box, and only the pressure difference caused by the pressure drop of the fluid passing through the heat exchange tube is considered during the design, so that the design pressure and the design difficulty are greatly reduced.

The above, it is not right the utility model discloses do any restriction, all according to the utility model discloses any simple modification, change and the equivalent structure change that the technical essence was done all still belong to the utility model discloses technical scheme's within the scope of protection.

Claims

1. A U-shaped tubular heat exchanger tube box structure is characterized by comprising three parts:

the first part is an independent cavity (5) which is composed of a plurality of sections of shells and directly connected with a heat fluid inlet pipe (4) of a pipe box and a heat exchange pipe (12) at the center of a pipe plate, and the independent cavity (5) is provided with a displacement compensation device (3) to ensure that the independent cavity (5) cannot be damaged due to excessive temperature difference stress under extreme temperature difference; high-temperature hot fluid directly enters the independent cavity (5) from the hot fluid inlet pipe (4) of the tube box, so that the hot fluid is prevented from contacting with the tube box shell (2);

the second part is a fountain type U-shaped heat exchange tube arrangement form, the U-shaped heat exchange tube is divided into a heat exchange tube (12) at the center of the tube plate and a heat exchange tube (13) at the edge of the tube plate, the U-shaped heat exchange tube is bent from inside to outside, each U-shaped heat exchange tube is respectively connected with a heat exchange tube hole at the center of the tube plate and a heat exchange tube hole at the edge of the tube plate, and a bent tube area at the tail end of the U-shaped tube bundle (7) is; in the tube distribution mode, all hot fluid flows into the heat exchange tubes (12) at the centers of the tube plates, and cold fluid after heat exchange flows out of the heat exchange tubes (13) at the edges of the tube plates;

the third part is a cold fluid guiding device (11), the device is arranged between a heat exchange tube (12) at the center of the tube plate and a heat exchange tube (13) at the edge of the tube plate and just covers the heat exchange tube (13) at the edge of the tube plate, the device constructs a three-quarter-circle annular flow channel, a gap of the remaining quarter-circle is vertically upward, and inner baffles (18) are arranged on two sides of the annular flow channel, which are perpendicular to the gap.

2. A U-shaped tube heat exchanger tube cassette structure as defined in claim 1, wherein the end portions of the heat exchange tubes (12) at the tube sheet center are filled with a center heat exchange tube end heat insulating layer (16), and the heat insulating layer (16) at the end portions of the center heat exchange tubes are pressed by a pressing plate (14) to ensure the heat insulating effect.

3. A U-tube type heat exchanger tube box structure according to claim 1, wherein an inner tube (15) for heat exchange tube is provided inside the heat exchange tube (12) at the center of the tube sheet, and the outer diameter of both ends of the inner tube (15) for heat exchange tube is larger than the outer diameter of the middle thereof, so that a certain gap is left between the inner surface of the heat exchange tube (12) at the center of the tube sheet and the outer surface of the inner tube (15) for heat exchange tube, and the inside of the gap is filled with a heat insulating material to form a heat insulating layer (17) inside the center heat exchange.

4. A tube box structure for a U-tube heat exchanger according to claim 1, characterized in that a thermal fluid inlet insulation (10) is arranged inside the thermal fluid inlet tube (4) of the tube box to prevent local high temperatures in the inlet tube.

5. A U-tube heat exchanger tube cassette structure according to claim 1, characterized in that the separate chamber (5) is provided with an access opening (1) at one end of the chamber body to ensure the need for access.