CN110030851A - A kind of bushing type floating head heat exchanger - Google Patents

Abstract

The invention relates to a casing type heat exchanger, in particular to a casing type floating head heat exchanger. The invention is used to realize the heat exchange requirements of two kinds of high temperature difference, high pressure difference, and even not allowing direct contact with two kinds of media, and can realize free heat exchange of three kinds of media at the same time. A casing type floating head heat exchanger comprises a front end tube box, a front end tube sheet, a middle tube box, a middle tube sheet, a shell and a rear head which are sealed and connected in sequence, and the shell is provided with a floating head tube sheet and a U-shaped heat exchange tube. The two ends of the tube head are sealed with the front tube sheet, the straight tube of the U-shaped heat exchange tube passes through the middle tube sheet and the floating head tube sheet, and the floating head tube sheet is sealed and connected with a floating head covering the elbow part of the U-shaped heat exchange tube. The cover, the middle tube sheet and the floating head tube sheet are connected with a casing sleeved on the straight pipe of the U-shaped heat exchange tube; the tube side, the middle pipe side and the shell side are formed inside the heat exchanger, which are isolated from each other and form a circuit independently. There is a tube-side partition in the middle of the front-end tube box, and an intermediate tube-pass partition in the middle of the middle tube box.

Description

A casing type floating head heat exchanger

technical field

The invention relates to a casing type heat exchanger, in particular to a casing type floating head heat exchanger.

Background technique

Heat exchangers play an important role in modern industrial production. In the face of the rapid development of the chemical industry, various advanced technological processes have emerged, and a series of complex working conditions have put the existing chemical equipment to the test. When the equipment is selected according to the process flow, two kinds of high temperature difference, high pressure difference, and even heat exchange conditions that do not allow direct contact between the two media are often encountered. At this time, in order to realize the technological process, usually multiple sets of equipment are added or a third medium is introduced to gradually realize the technological process, which invisibly increases the investment cost of the project. Therefore, a new type of heat exchange equipment is needed to make up for the shortcomings of the existing equipment that faces a variety of complex working conditions and the equipment performance is insufficient.

SUMMARY OF THE INVENTION

The invention provides a casing type floating head heat exchanger, which is used to realize the heat exchange requirements of two kinds of high temperature difference, high pressure difference, and even not allowing direct contact with two kinds of media, and can realize free heat exchange of three kinds of media at the same time.

The present invention is realized by adopting the following technical solutions: a casing-type floating head heat exchanger, comprising a front-end tube box, a front-end tube sheet, a middle tube box, a middle tube sheet, a shell, a rear head and a shell which are sealed and connected in sequence. The end connected with the rear head has a floating head tube sheet inside, the two ends of the U-shaped heat exchange tube are sealed with the front tube sheet, and the straight tube of the U-shaped heat exchange tube passes through the middle tube sheet, the floating head tube sheet, and the floating head tube. The plate is sealed and connected with a floating head cover covering the elbow part of the U-shaped heat exchange tube, and a sleeve on the straight pipe of the U-shaped heat exchange tube is connected between the intermediate tube plate and the floating head tube plate; inside the heat exchanger It forms a medium flow that is isolated from each other and forms a loop independently; the front-end tube box has a tube-side inlet and a tube-side outlet, and the middle tube box has a middle tube-side inlet and an intermediate tube-side outlet. The shell has a shell side inlet and a shell side outlet; a tube side separator is arranged in the middle of the front-end tube box, and a middle tube-side separator is arranged in the middle of the middle tube box; The upper space of the plate, the U-shaped heat exchange tube, the lower space of the tube side separator of the front-end tube box, and the tube side outlet; the middle tube side flows through the middle tube side inlet, the upper space of the middle tube side separator of the middle tube box, and is sleeved in the middle tube side. The inside of the casing on the upper straight tube of the U-shaped heat exchange tube, the inner cavity of the floating head cover, the inside of the casing on the lower straight tube of the U-shaped heat exchange tube, the space at the lower part of the middle tube side partition of the middle tube box, the middle Tube side outlet; the shell side flows through the shell side inlet, the space between the shell and the casing, the space between the floating head cover and the rear head, and the shell side outlet.

The sleeve-type floating head heat exchanger of the present invention realizes the heat exchange requirements of two kinds of high temperature difference, high pressure difference, and even does not allow direct contact with two kinds of media, and can realize free heat exchange of three kinds of media at the same time. It has the characteristics of compact structure, safety and reliability, wide application range, and meets various complex process requirements.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic structural diagram of a U-shaped heat exchange tube;

Fig. 3 is a partial left side view of Fig. 2;

FIG. 4 is another partial left side view of FIG. 2 .

In the picture: 1- Front end tube box, 2- Front end tube sheet, 3- Middle tube box, 4- Middle tube sheet, 5- Shell, 6- Baffle plate, 7- Floating head tube sheet, 8- Floating head cover, 9 - Rear head, 10-U-shaped heat exchange tube, 11-Sleeve, 12-Tube side separator, 13- Middle tube side separator.

Detailed ways

A casing type floating head heat exchanger, comprising a front end tube box 1, a front end tube sheet 2, a middle tube box 3, a middle tube sheet 4, a shell 5, a rear head 9, the shell 5 and the rear seal, which are sequentially sealed and connected. There is a floating head tube sheet 7 inside the connecting end of the head 9, the two ends of the U-shaped heat exchange tube 10 are sealed with the front end tube sheet 2, and the straight pipe of the U-shaped heat exchange tube 10 passes through the middle tube sheet 4 and the floating head tube sheet 7. , the floating head tube plate 7 is sealed and connected with a floating head cover 8 covering the elbow portion of the U-shaped heat exchange tube 10, and a straight tube sleeved on the U-shaped heat exchange tube 10 is connected between the intermediate tube plate 4 and the floating head tube plate 7 The casing 11 on the upper part of the heat exchanger; the tube side, the middle pipe side, and the shell side are formed inside the heat exchanger, which are isolated from each other and form a separate circuit; the front end pipe box 1 has a pipe side inlet and a tube side outlet, and the middle pipe box 3 There are middle tube side inlet and middle tube side outlet, shell 5 has shell side inlet and shell side outlet; front end tube box 1 is provided with tube side separator 12, middle tube box 3 is provided with middle tube side separator 13; The tube pass flows through the tube pass inlet, the upper space of the tube pass partition 12 of the front end tube box 1, the U-shaped heat exchange tube 10, the lower space of the tube pass partition 12 of the front end tube box 1, and the tube pass outlet in turn; the middle tube pass It flows through the inlet of the middle tube side, the upper space of the middle tube side partition plate 13 of the middle tube box 3, the inside of the sleeve 11 sleeved on the upper straight pipe of the U-shaped heat exchange tube 10, the inner cavity of the floating head cover 8, and the inner cavity of the U-shaped heat exchange tube 10. The inside of the casing 11 on the lower straight pipe of the heat exchange tube 10, the lower space of the middle tube side partition plate 13 of the middle tube box 3, the middle tube side outlet; the shell side flows through the shell side inlet, between the shell 5 and the casing 11 , the space between the floating head cover 8 and the rear head 9, and the shell side outlet.

When the heat exchanger is running, the U-shaped heat exchange tube 10 of the tube-side box, the sleeve 11 of the intermediate tube-side cavity, and the shell 5 of the shell-side cavity can be freely expanded and contracted, and will not be affected by the temperature difference of the three media. The thermal stress is generated, which is harmful to the equipment. When the working conditions are two process media that do not allow direct contact, the two media can be passed into the tube side and the shell side respectively, and the neutralizing medium can be passed into the middle tube side, and the two process media are separated by the middle tube side. Corrosion leakage occurs in any part of the process and the shell side, which will be neutralized by the medium in the middle tube side, and will not cause direct contact between the two process media, which is safe and reliable. When the pressure difference between the two process media is large, a harmless medium with a certain pressure can be introduced into the middle tube side to reduce the pressure difference of the process medium, so as to realize the use of thinner tube sheets to withstand larger pressure conditions and reduce equipment cost.

Multiple groups of U-shaped heat exchange tubes 10 pass through the casing 11 to form a tube bundle. The casing 11 is provided with a baffle 6, which can support the casing 11 and change the flow direction of the shell-side medium to improve the heat exchange efficiency.

Fins or channels are arranged on the outer wall of the straight tube of the U-shaped heat exchange tube 10. The fins or channels have a certain supporting and fixing effect on the U-shaped heat exchange tube 10, which can reduce the size of the U-shaped heat exchange tube 10 when the equipment is running. The vibration can also play a turbulent role in the intermediate tube side medium and enhance the heat exchange effect of the equipment.

Claims (3)

1. a kind of bushing type floating head heat exchanger, which is characterized in that including front-end pipe box (1), the front end tube sheet being successively tightly connected (2), intermediate bobbin carriage (3), sagging plate (4), shell (5), rear head (9), shell (5) are connect inside one end with rear head (9) Have floating tubesheet (7), the both ends tube head of U-shaped heat exchanger tube (10) and front end tube sheet (2) are tightly connected, U-shaped heat exchanger tube (10) it is straight Pipe is sealedly connected on sagging plate (4), floating tubesheet (7), floating tubesheet (7) covers U-shaped heat exchanger tube (10) bent portion The floating head (8) divided, is connected with the set being placed on the straight tube of U-shaped heat exchanger tube (10) between sagging plate (4) and floating tubesheet (7) It manages (11)；Tube side, intermediate tube side, shell side three medium processes that are mutually isolated, constituting circuit alone are formed inside heat exchanger；Before There are tube-side inlet and tube side outlet on end pipe case (1), there is intermediate tube-side inlet and intermediate tube side outlet, shell on intermediate bobbin carriage (3) Body has shell side inlet and shell-side outlet on (5)；Tube side partition (12) are equipped among front-end pipe box (1), are set among intermediate bobbin carriage (3) There is intermediate tube side partition (13)；Tube side is followed by tube-side inlet, tube side partition (12) upper space, the U-shaped of front-end pipe box (1) Heat exchanger tube (10), tube side partition (12) lower space of front-end pipe box (1), tube side outlet；Intermediate tube side is followed by intermediate tube Journey entrance, intermediate bobbin carriage (3) intermediate tube side partition (13) upper space, be placed on the top straight tube of U-shaped heat exchanger tube (10) Casing (11) inside, floating head (8) inner cavity, casing (11) inside being placed on the lower part straight tube of U-shaped heat exchanger tube (10), intermediate tube Intermediate tube side partition (13) lower space of case (3), intermediate tube side outlet；Shell side flows through shell side inlet, shell (5) and casing (11) space, shell-side outlet between space, floating head (8) between and rear head (9).

2. a kind of bushing type floating head heat exchanger according to claim 1, which is characterized in that casing (11) peripheral hardware baffle plate (6)。

3. a kind of bushing type floating head heat exchanger according to claim 1 or 2, which is characterized in that U-shaped heat exchanger tube (10) it is straight Fin or conduit are provided in pipe outer wall.