Horizontal four-flow U-shaped pipe low-pressure heater with submerged drainage cooling section

Abstract

The utility model discloses a horizontal four-flow U-shaped pipe low-pressure heater with a submerged drainage cooling section, and belongs to heat exchange equipment. The problem that at the present stage, a two-flow horizontal U-shaped pipe low-pressure heater is long is solved. The heat exchanger comprises a tube box and a heat exchange shell, a water inlet chamber, a water drainage chamber and a transfer chamber are arranged in the pipe box, the water inlet chamber is communicated with a condensed water inlet pipe and realizes the introduction of condensed water, and the water drainage chamber is communicated with a condensed water outlet pipe and realizes the discharge of the condensed water; three groups of U-shaped tube bundles are arranged in the heat exchange chamber of the heat exchange shell, two groups of U-shaped tube bundles are arranged corresponding to the water inlet chamber and the transfer chamber, water inlets of the two groups of U-shaped tube bundles are communicated with the water inlet chamber, and water outlets of the two groups of U-shaped tube bundles are communicated with the transfer chamber; the other group of U-shaped tube bundles are arranged corresponding to the drainage chamber and the transfer chamber, water inlets of the other group of U-shaped tube bundles are communicated with the transfer chamber, and water outlets of the other group of U-shaped tube bundles are communicated with the drainage chamber. The heat exchanger is mainly used for heat exchange of steam and condensed water.

Description

Technical Field

[0001] The utility model belongs to heat exchange equipment, in particular to a horizontal four-flow U-tube low-pressure heater with a submerged drain cooling section. Background Art

[0002] In the layout of the heat exchange equipment system of a solar thermal power station, a horizontal U-tube low-pressure heater with a submerged drain cooling section has a two-pass structure due to the particularity of the U-tube low-pressure heater's piping structure. The two-pass horizontal low-pressure heater has an equipment length-to-diameter ratio of 10 to 17, which results in the low-pressure heater heat exchange equipment being too long, heavy, and occupying a large plant space. In addition, the consumption of civil engineering raw materials is relatively high, which has a significant impact on the power plant project cost and initial construction investment. Utility Model Content

[0003] The utility model aims to solve the problem that the two-pass horizontal U-tube low-pressure heater at present is relatively long, and further provides a horizontal four-pass U-tube low-pressure heater with a submerged drain cooling section.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A horizontal four-pass U-tube low-pressure heater with a submerged drain cooling section comprises a tube box and a heat exchange shell; three chambers are arranged in the tube box, namely a water inlet chamber, a drainage chamber and a transfer chamber, the water inlet chamber is connected to a condensate inlet pipe and enables the entry of condensate, and the drainage chamber is connected to a condensate outlet pipe and enables the discharge of condensate; three groups of U-tube bundles are arranged in the heat exchange chamber of the heat exchange shell, two groups of U-tube bundles are arranged corresponding to the water inlet chamber and the transfer chamber, the water inlets of the two groups of U-tube bundles are connected to the water inlet chamber, and the water outlets are connected to the transfer chamber; another group of U-tube bundles is arranged corresponding to the drainage chamber and the transfer chamber, the water inlet of the other group of U-tube bundles is connected to the transfer chamber, and the water outlet is connected to the drainage chamber.

[0006] Preferably, the pipe box is provided with a longitudinal partition plate and a transverse partition plate. The longitudinal partition plate is radially installed in the pipe box and divides the inner cavity of the pipe box into a left chamber and a right chamber, wherein the left chamber is a transfer chamber; the transverse partition plate is radially installed in the right chamber and divides the right chamber into an upper chamber and a lower chamber, wherein the upper chamber is a drainage chamber, and the lower chamber is a water inlet chamber.

[0007] Preferably, the three groups of U-shaped tube bundles are arranged in the radial direction and from top to bottom in the heat exchange chamber of the heat exchange shell, and are specifically divided into an upper U-shaped tube bundle, a middle U-shaped tube bundle and a lower U-shaped tube bundle. The water inlet of the upper U-shaped tube bundle is connected to the left chamber, and the water outlet is connected to the upper chamber; the water inlet of the middle U-shaped tube bundle is connected to the lower chamber, and the water outlet is connected to the left chamber; the water inlet of the lower U-shaped tube bundle is connected to the lower chamber, and the water outlet is connected to the left chamber.

[0008] Preferably, a submerged hydrophobic cooling section cladding is further provided in the heat exchange shell, and the submerged hydrophobic cooling section cladding is sleeved on the lower U-shaped tube bundle to achieve a heat insulation effect.

[0009] Preferably, the pipe box also includes a pipe box head, a pipe box cylinder and a pipe box flange; the pipe box head, the pipe box cylinder and the pipe box flange are axially arranged and connected in sequence to form an inner cavity of the pipe box; the pipe box is connected to the heat exchange shell through the pipe box flange; the condensate inlet pipe and the condensate outlet pipe are respectively connected to the pipe box cylinder and installed at the positions corresponding to the corresponding chambers.

[0010] Preferably, the heat exchange shell comprises a flange tube sheet, a cylinder, a head, a steam inlet pipe and a drain pipe; the flange tube sheet, the cylinder and the head are axially connected in sequence to form a heat exchange chamber; the heat exchange shell is fixedly connected to the tube box through the flange tube sheet, and each group of U-shaped tube bundles is composed of a number of U-shaped tubes 2-6, both ends of the U-shaped tubes are connected to the flange tube sheet and communicate with the chamber in the tube box; the steam inlet pipe and the drain pipe are respectively installed on the cylinder, and the high-temperature steam is introduced through the steam inlet pipe, and the steam condensed into drain is discharged through the drain pipe.

[0011] Preferably, the low-pressure heater further comprises two saddle-type supports, and the heat exchange shell is horizontally mounted on the two saddle-type supports to form a horizontal structure.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The present application provides a horizontal four-pass U-tube low-pressure heater, the heat exchange tube length of this low-pressure heater is shortened to half the length of the two-pass low-pressure heater, and the aspect ratio of the low-pressure heater equipment is controlled within a reasonable range of 5 to 8, which effectively shortens the length of the heat exchanger, so that the total length of the equipment is effectively and reasonably controlled, and at the same time, the raw material consumption of the equipment is greatly reduced compared to the original "slender" low-pressure heater. It not only saves the cost of the low-pressure heater equipment, but also greatly reduces the equipment footprint, making the system layout compact and more reasonable, saving plant space, reducing civil engineering and project costs, and achieving significant benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] As a part of this application, the accompanying drawings are used to provide a further understanding of the present invention.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 for Figure 1 Cross-sectional view at AA in the middle.

[0017] Explanation of the reference numerals: 1: pipe box; 1-1: longitudinal partition plate; 1-2: transverse partition plate; 1-3: left chamber; 1-4: right chamber; 1-5: upper chamber; 1-6: lower chamber; 1-7: condensate inlet pipe; 1-8: condensate outlet pipe; 1-9: pipe box head; 1-10: pipe box cylinder; 1-11: pipe box flange; 2: heat exchange shell; 2-1: flange tube sheet; 2-2: cylinder; 2-3: head; 2-4: drain pipe; 2-5: steam inlet pipe; 3: submerged drain cooling section cladding; 4: upper U-shaped tube bundle; 5: middle U-shaped tube bundle; 6: lower U-shaped tube bundle; 7: saddle support. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0019] See also Figure 1 and Figure 2 , the embodiment of the present application provides a horizontal four-pass U-tube low-pressure heater with a submerged drain cooling section, comprising a tube box 1 and a heat exchange shell 2;

[0020] The pipe box 1 is provided with a longitudinal partition plate 1-1 and a transverse partition plate 1-2. The longitudinal partition plate 1-1 is radially installed in the pipe box 1 and divides the inner cavity of the pipe box 1 into a left chamber 1-3 and a right chamber 1-4 of equal size, wherein the left chamber 1-3 is a transit chamber for condensed water to flow from one group of U-shaped tube bundles to another group of U-shaped tube bundles; the transverse partition plate 1-2 is radially installed in the right chamber 1-4 and divides the right chamber 1-4 into an upper chamber 1-5 and a lower chamber 1-6 of equal size; wherein the upper chamber 1-5 is a drainage chamber, and the lower chamber 1-6 is a water inlet chamber; the pipe box 1 is also provided with a condensate inlet pipe 1-7 and a condensate outlet pipe 1-8, wherein the condensate inlet pipe 1-7 is connected to the lower chamber 1-6 and realizes the passage of condensate, and the condensate outlet pipe 1-8 is connected to the upper chamber 1-5 and realizes the discharge of condensate;

[0021] Three groups of U-shaped tube bundles are arranged in the radial direction and from top to bottom in the heat exchange chamber of the heat exchange shell 2, which are specifically divided into an upper U-shaped tube bundle 4, a middle U-shaped tube bundle 5 and a lower U-shaped tube bundle 6. The water inlet of the upper U-shaped tube bundle 4 is connected to the left chamber 1-3, and the water outlet is connected to the upper chamber 1-5; the water inlet of the middle U-shaped tube bundle 5 is connected to the lower chamber 1-6, and the water outlet is connected to the left chamber 1-3; the water inlet of the lower U-shaped tube bundle 6 is connected to the lower chamber 1-6, and the water outlet is connected to the left chamber 1-3.

[0022] In this embodiment, the internal chamber of the tube box is divided into four condensate flow areas by a partition plate, wherein the lower chamber 1-6 is the first flow, and the lower and upper halves of the left chamber 1-3 are the second and third flows respectively. Since the condensate flows from the lower chamber of the left chamber 1-3 to the upper chamber, and finally enters the upper chamber 1-5 of the upper U-shaped tube bundle 4, the upper chamber 1-5 is the fourth flow, and the low-pressure heater of this embodiment is a four-flow low-pressure heater. The number of heat exchange tubes arranged in each condensate flow area is as equal as possible to ensure that the water velocity in the heat exchange tubes of each condensate flow is equal.

[0023] Heat exchange process of condensate: condensate enters the lower chamber 1-6 from the condensate inlet pipe 1-7, and then enters the middle U-shaped tube bundle 5 and the lower U-shaped tube bundle 6 from the lower chamber 1-6 for heat exchange. After heat exchange in the heat exchange shell 2, the condensate enters the left chamber 1-3. Since the water inlet of the upper U-shaped tube bundle 4 is connected to the left chamber 1-3, the condensate enters the upper U-shaped tube bundle 4 from the left chamber 1-3 for heat exchange. The condensate after heat exchange enters the upper chamber 1-5 and is discharged from the condensate outlet pipe 1-8. That is to say, the condensate goes through four processes to form a four-process low-pressure heater. Due to the increase in the number of heat exchange tubes and the number of processes, the heat exchange length of the U-shaped tube bundle of the two-process low-pressure heater is shortened to one-half, reducing the area occupied by the plant.

[0024] like Figure 1 As shown, since condensed water is introduced into the U-shaped tube bundle, after heat exchange with the high-temperature steam introduced into the heat exchange shell 2, the temperature requirement of the discharged condensed drain cannot be too high. Therefore, the heat exchange shell 2 described in this embodiment is also provided with a submerged drain cooling section cladding 3, and the submerged drain cooling section cladding 3 is mounted on the lower U-shaped tube bundle 6 to achieve the effect of heat insulation. The heat exchange capacity of the condensed water in the lower U-shaped tube bundle 6 is small. After mixing with the condensed water in the other U-shaped tube bundles, the discharged drain temperature can be reduced to meet the drain discharge requirement.

[0025] like Figure 1As shown, the pipe box 1 described in this embodiment also includes a pipe box head 1-9, a pipe box cylinder 1-10 and a pipe box flange 1-11; the pipe box head 1-9, the pipe box cylinder 1-10 and the pipe box flange 1-11 are axially arranged and connected in sequence to form an inner cavity of the pipe box 1; the pipe box 1 is connected to the heat exchange shell 2 through the pipe box flange 1-11; the condensate inlet pipe 1-7 and the condensate outlet pipe 1-8 are respectively connected to the pipe box cylinder 1-10, and are installed at the positions corresponding to the corresponding chambers.

[0026] like Figure 1 As shown, the heat exchange shell 2 described in this embodiment includes a flange tube sheet 2-1, a cylinder 2-2, a head 2-3, a drain pipe 2-4 and a steam inlet pipe 2-5; the flange tube sheet 2-1, the cylinder 2-2 and the head 2-3 are axially connected in sequence to form a heat exchange chamber; the heat exchange shell 2 is fixedly connected to the tube box 1 through the flange tube sheet 2-1, and three groups of U-shaped tube bundles are fixed in the heat exchange chamber through baffles. Each group of U-shaped tube bundles is composed of a plurality of U-shaped tubes 2-6, and both ends of the U-shaped tubes 2-6 are connected to the flange tube sheet 2-1 and communicate with the chamber in the tube box 1; the steam inlet pipe 2-5 and the drain pipe 2-4 are respectively installed on the cylinder 2-2, and the high-temperature steam is introduced through the steam inlet pipe 2-5, and the steam condensed into drain is discharged through the drain pipe.

[0027] In this embodiment, the flange tube sheet 2-1 is a flange structure and is welded on the cylinder 2-2. It also serves as the connection flange of the heat exchange shell 2 to avoid repeated arrangement and installation of flanges. In addition, the flange tube sheet 2-1 is also a tube sheet connecting the tube box 1 and the heat exchange shell 2. A number of through holes are opened on the plate surface of the flange tube sheet 2-1. The two end ports of the U-shaped tube bundle are respectively connected to their corresponding through holes to achieve communication with the inner chamber of the tube box 1. Finally, the tube box 1 and the heat exchange shell 2 are connected by flanges to facilitate the subsequent maintenance of the inside of the tube box.

[0028] like Figure 1 As shown, the low-pressure heater further comprises two saddle supports 7, and the heat exchange shell 2 is horizontally mounted on the two saddle supports 7 to form a horizontal structure.

[0029] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A horizontal four-pass U-tube low-pressure heater with a submerged drain cooling section, characterized in that: It comprises a pipe box (1) and a heat exchange shell (2); The pipe box (1) is provided with three chambers, namely a water inlet chamber, a water discharge chamber and a transfer chamber. The water inlet chamber is connected to the condensate inlet pipe (1-7) to allow the condensate to enter, and the water discharge chamber is connected to the condensate outlet pipe (1-8) to allow the condensate to be discharged. Three groups of U-shaped tube bundles are arranged in the heat exchange chamber of the heat exchange shell (2), wherein two groups of U-shaped tube bundles are arranged corresponding to the water inlet chamber and the transfer chamber, the water inlets of the two groups of U-shaped tube bundles are connected to the water inlet chamber, and the water outlets are connected to the transfer chamber; another group of U-shaped tube bundles is arranged corresponding to the drainage chamber and the transfer chamber, the water inlet of the other group of U-shaped tube bundles is connected to the transfer chamber, and the water outlet is connected to the drainage chamber.

2. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 1, characterized in that: The pipe box (1) is provided with a longitudinal partition plate (1-1) and a transverse partition plate (1-2). The longitudinal partition plate (1-1) is radially installed in the pipe box (1) and divides the inner cavity of the pipe box (1) into a left chamber (1-3) and a right chamber (1-4), wherein the left chamber (1-3) is a transfer chamber; the transverse partition plate (1-2) is radially installed in the right chamber (1-4) and divides the right chamber (1-4) into an upper chamber (1-5) and a lower chamber (1-6), wherein the upper chamber (1-5) is a drainage chamber, and the lower chamber (1-6) is a water inlet chamber.

3. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 2, characterized in that: The three groups of U-shaped tube bundles are arranged in the heat exchange chamber of the heat exchange shell (2) along the radial direction and from top to bottom, and are specifically divided into an upper U-shaped tube bundle (4), a middle U-shaped tube bundle (5) and a lower U-shaped tube bundle (6). The water inlet of the upper U-shaped tube bundle (4) is connected to the left chamber (1-3), and the water outlet is connected to the upper chamber (1-5); the water inlet of the middle U-shaped tube bundle (5) is connected to the lower chamber (1-6), and the water outlet is connected to the left chamber (1-3); the water inlet of the lower U-shaped tube bundle (6) is connected to the lower chamber (1-6), and the water outlet is connected to the left chamber (1-3).

4. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 3, characterized in that: A submerged hydrophobic cooling section cladding (3) is also provided in the heat exchange shell (2), and the submerged hydrophobic cooling section cladding (3) is sleeved on the lower U-shaped tube bundle (6) to achieve a heat insulation effect.

5. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 1, characterized in that: The pipe box (1) also includes a pipe box head (1-9), a pipe box cylinder (1-10) and a pipe box flange (1-11); the pipe box head (1-9), the pipe box cylinder (1-10) and the pipe box flange (1-11) are axially arranged and connected in sequence to form an inner cavity of the pipe box (1); the pipe box (1) is connected to the heat exchange shell (2) through the pipe box flange (1-11); the condensate inlet pipe (1-7) and the condensate outlet pipe (1-8) are respectively connected to the pipe box cylinder (1-10) and installed at positions corresponding to corresponding chambers.

6. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 1, characterized in that: The heat exchange shell (2) comprises a flange tube sheet (2-1), a cylinder (2-2), a head (2-3), a drain pipe (2-4) and a steam inlet pipe (2-5); the flange tube sheet (2-1), the cylinder (2-2) and the head (2-3) are axially connected in sequence to form a heat exchange chamber; the heat exchange shell (2) is fixedly connected to the tube box (1) through the flange tube sheet (2-1); each group of U-shaped tube bundles is composed of a plurality of U-shaped tubes (2-6); both ends of the U-shaped tubes (2-6) are connected to the flange tube sheet (2-1) and communicate with the chamber in the tube box (1); the steam inlet pipe (2-5) and the drain pipe (2-4) are respectively installed on the cylinder (2-2); the high-temperature steam is introduced through the steam inlet pipe (2-5); and the steam condensed into drain is discharged through the drain pipe (2-4).

7. The horizontal four-pass U-tube low-pressure heater with submerged drain cooling section according to claim 1, characterized in that: The low-pressure heater further comprises two saddle-type supports (7), and the heat exchange shell (2) is horizontally mounted on the two saddle-type supports (7) to form a horizontal structure.

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