Steam generator

Abstract

The utility model discloses a steam generator, relates to the technical field of steam generators, and aims to solve the problems that fluid impacts a tube bundle, a heat exchange tube is easy to damage, the water content of steam is large, the effect of a demister is reduced along with time and the like in the design of the steam generator commonly used in the industry at present in the prior art. A tube pass inlet N1 and a tube pass outlet N2 are formed in the upper end and the lower end of the tube box 1 respectively, the tube pass inlet N1 is an inlet of hot fluid, the tube pass outlet N2 is an outlet of the hot fluid subjected to heat exchange, a liquid inlet N3 is formed in the side wall of the shell 3 and used for supplementing water to the steam generator, and a steam outlet N4 is formed in the top of the shell 3 and used for supplementing water to the steam generator. A wire mesh demister 10 is arranged on a steam outlet N4 of the shell 3 and used for further removing liquid water in steam, and the heat exchange tube bundle 4 is of a U-shaped tube type.

Description

Technical Field

[0001] The utility model relates to the technical field of steam generators, in particular to a steam generator. Background Art

[0002] A steam generator is a device that uses high-temperature logistics in industrial production processes as a heat source to generate steam. It serves as both a cooler for high-temperature logistics in the process and a waste heat recoverer. Through an efficient heat exchange process, the steam generator transfers the heat energy in the high-temperature logistics to water, causing it to evaporate into steam. This process not only achieves effective cooling of the high-temperature logistics, but also makes full use of waste heat resources that might otherwise be wasted, thereby improving the energy utilization efficiency of the entire system.

[0003] For example, an electric heating steam generator with automatic water addition is disclosed, which includes a support, a heating tank, a water inlet, a first electric heating wire, a constant pressure valve, a steam pipe, a float, a pressure relief port and a pressure gauge. The support is located at the bottom of the entire device, the top of the support is provided with the heating tank, the interior of the heating tank is provided with the first heating wire and the float, the top of the heating tank is provided with the water inlet and the constant pressure valve, the top of the constant pressure valve is provided with the steam pipe, and one side of the heating tank is provided with the pressure relief port and the pressure gauge. In the present utility model, a float is provided. When the water level is too low, the piston is pulled down by the float to add water to the heating tank, thereby preventing the heating tank from being damaged by the low water level. When the water volume is sufficient, the piston is pushed by the float to close the water outlet, thereby preventing the internal pressure of the heating tank from being too high due to excessive water volume. A constant pressure valve is designed to allow the steam to stay in the heating tank for a period of time to ensure the temperature of the steam.

[0004] Currently, the shell-side liquid inlet of steam generators commonly used in industry is mostly set at the bottom or middle of the shell. This design will cause the shell-side inlet fluid to directly impact the heat exchange tube bundle when entering the steam generator, which can easily cause the tube bundle to vibrate, causing friction and collision between the heat exchange tubes and the support plate, resulting in damage to the heat exchange tubes. At the same time, in order to prevent the generated steam from carrying water, a wire mesh demister is installed at the shell-side steam outlet to remove liquid water from the steam. However, due to the limitation of the shell-side volume, the wire mesh demister is close to the boiling water, and the amount of water carried by the steam is relatively large, resulting in a large workload for the wire mesh demister. As the operating time increases, the demisting effect decreases and the amount of water carried by the generated steam increases. Therefore, the market urgently needs to develop a steam generator to help people solve the existing problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a steam generator to solve the problems raised in the above background technology, such as fluid impact on the tube bundle, easy damage to the heat exchange tube, large amount of steam water, and the defoamer effect decreasing over time in the current commonly used steam generator design in industry.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A steam generator comprises a tube box, a tube sheet, a shell, a heat exchange tube bundle, a support plate, and a tube bundle sleeve, wherein the upper and lower ends of the tube box are respectively provided with a tube-side inlet and a tube-side outlet, the shell is connected to one side of the tube box, a tube sheet is fixedly connected between the tube box and the shell, a tube bundle sleeve is fixedly provided inside the shell, a plurality of support plates are fixedly provided inside the shell and on the outside of the tube bundle sleeve, a liquid inlet is provided on the side wall of the shell, a steam outlet is provided on the top of the shell, a heat exchange tube bundle is fixedly provided inside the tube bundle sleeve, the heat exchange tube bundle is U-shaped, and a wire mesh demister is provided on the steam outlet of the shell.

[0007] Preferably, the tube bundle sleeve wraps the entire heat exchange tube bundle, one end of the tube bundle sleeve is fixedly connected to the tube sheet, and the lower end of the tube bundle sleeve is fixedly connected to the shell.

[0008] Preferably, an opening is axially provided above the tube bundle sleeve, a water baffle is provided on the opening, and an opening for water inlet is provided below the tube bundle sleeve.

[0009] Preferably, the steam generator further comprises a first steam baffle, the lower end of the first steam baffle is fixedly connected to the water baffle, and the upper end of the first steam baffle is fixedly connected to the shell.

[0010] Preferably, a second steam baffle is connected to one side of the first steam baffle, and the second steam baffle is placed horizontally and fixedly connected to the middle part of one side of the first steam baffle.

[0011] Preferably, the liquid inlet is connected to a tubular liquid distributor.

[0012] Preferably, the tubular liquid distributor is fixedly connected to the liquid inlet via a 90° elbow.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] In this utility model, a tube bundle sleeve is installed around the heat exchange tube bundle. The tube bundle sleeve is connected to the heat exchanger tube sheet and shell. The sleeve is provided with an axial opening at the top to allow steam to exit the sleeve. At the same time, a water baffle is provided axially. The upper edge of the water baffle is higher than the liquid level when the equipment is in operation. This can create a "boiling chamber" during equipment operation, reducing the disturbance of the water outside the "boiling chamber" during boiling, thereby reducing the amount of water carried by the produced steam. On the other hand, the tube bundle sleeve also protects the tube bundle and reduces the impact of water inflow. At the same time, an opening is provided below the tube bundle sleeve for liquid inlet.

[0015] In this utility model, a first steam baffle is provided above the water baffle. One side of the first steam baffle is connected to the tube bundle sleeve, and the other side is connected to the steam generator shell, dividing the steam generator into two areas, the "steam zone" and the "gas outlet zone". When the equipment is running, the steam generated in the "boiling chamber" first impacts the baffle for preliminary dehydration, and then enters the "gas outlet zone" from the "steam zone". In the "gas outlet zone", it is defogged by the wire mesh demister and then sent out of the equipment. Furthermore, a second steam baffle can be provided in the middle of one side of the first steam baffle to further increase the effect of preliminary dehydration. After preliminary dehydration by the first steam baffle and the second steam baffle, the workload of the wire mesh demister is reduced, preventing the wire mesh demister from being overloaded and causing steam to carry water.

[0016] In this utility model, a tubular liquid distributor is provided at the water inlet of the steam generator, thereby reducing the impact of the incoming water on the heat exchange tube bundle. Furthermore, a 90° elbow can be installed at the water inlet and connected to the tubular liquid distributor to change the inlet direction of the water, thereby further reducing the scouring of the bottom of the tube bundle and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a steam generator according to the present invention;

[0018] Figure 2 It is a side view of the present utility model.

[0019] In the figure: 1. Tube box; 2. Tube sheet; 3. Shell; 4. Heat exchange tube bundle; 5. Support plate; 6. Tube bundle casing; 7. Water baffle; 8. First steam baffle; 9. Second steam baffle; 10. Wire mesh demister; 11. 90° elbow; 12. Tubular liquid distributor; N1, tube inlet; N2, tube outlet; N3, liquid inlet; N4, steam outlet. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] See also Figure 1-2The utility model provides an embodiment: a steam generator, including a tube box 1, a tube sheet 2, a shell 3, a heat exchange tube bundle 4, and a support plate 5. The upper and lower ends of the tube box 1 are respectively provided with a tube side inlet N1 and a tube side outlet N2. The tube side inlet N1 is the inlet of the hot fluid, and the tube side outlet N2 is the outlet of the hot fluid after heat exchange. One side of the tube box 1 is connected to the shell 3, and the tube sheet 2 is fixedly connected between the tube box 1 and the shell 3. A tube bundle sleeve 6 is fixedly provided inside the shell 3, and multiple support plates 5 are fixedly provided inside the shell 3 and outside the tube bundle sleeve 6. A liquid inlet N3 is provided on the side wall of the shell 3 for replenishing water to the steam generator. A steam outlet N4 is provided on the top of the shell 3, which is the steam outlet of the steam generator. A wire mesh demister 10 is provided on the steam outlet N4 of the shell 3 for further removing liquid water in the steam. The heat exchange tube bundle 4 is a U-shaped tube type.

[0022] Furthermore, the tubular liquid distributor 12 is fixedly connected to the liquid inlet N3 through a 90° elbow 11, changing the liquid inlet direction to downward water inlet and dispersing a large stream of water into multiple streams, thereby reducing disturbance to the steam generator heat exchange tube bundle 4.

[0023] Furthermore, the tube bundle sleeve 6 wraps the entire heat exchange tube bundle 4 , one end of the tube bundle sleeve 6 is fixedly connected to the tube sheet 2 , and the lower end of the tube bundle sleeve 6 is fixedly connected to the shell 3 .

[0024] Furthermore, an opening is provided axially above the tube bundle sleeve 6, and a water baffle 7 is provided on the opening, the upper edge of which is higher than the liquid level during operation, thereby creating a "boiling chamber" in the radial direction when the equipment is running, reducing the disturbance of the water body in the shell 3 during boiling, thereby reducing the amount of water carried by the produced steam, and an opening for water inlet is provided below the tube bundle sleeve 6. Since the tube bundle sleeve 6 is long, the provided opening helps water to enter the tube bundle sleeve 6 to participate in heat exchange.

[0025] Furthermore, the steam generator also includes a first steam baffle 8, the lower end of the first steam baffle 8 is fixedly connected to the water baffle 7, the upper end of the first steam baffle 8 is fixedly connected to the shell 3, and a second steam baffle 9 is connected to one side of the first steam baffle 8. The second steam baffle 9 is placed horizontally and fixedly connected to the middle part of one side of the first steam baffle 8, so that the steam generated by the heat exchange tube bundle 4 first impacts the first steam baffle 8 and the second steam baffle 9 for preliminary dehydration, and then further removes water from the steam through the wire mesh demister 10, and finally leaves through the outlet N4.

[0026] Working principle: When in use, when the equipment is running, the hot fluid enters the pipe box 1 through the tube inlet N1, and then heats the water in the shell 3 to boil through the heat exchange tube bundle 4. After completing the heat exchange, it leaves the equipment from the tube outlet N2. The water passes through the liquid inlet N3, turns through the 90° elbow, and enters the shell 3 with less impact through the tubular liquid distributor 12, reducing the scouring of the heat exchange tube bundle 4 and the shell 3. The water entering the shell 3 boils and exchanges heat in the "boiling chamber" composed of the tube bundle sleeve 6 and the water baffle 7. The boiling of water is confined to the "boiling chamber" space, and the disturbance to the surrounding water body is small. The steam generated by boiling has low water content. The steam generated by the heat exchange tube bundle 4 impacts the first steam baffle 8 and the second steam baffle 9 to remove larger droplets carried in the water vapor, and then passes through the wire mesh demister 10 to further remove small droplets carried in the water. Finally, high-quality steam leaves the equipment through the outlet N4.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A steam generator comprising a tube box (1), a tube sheet (2), a shell (3), a heat exchange tube bundle (4), a support plate (5), and a tube bundle sleeve (6), characterized in that: The upper and lower ends of the tube box (1) are respectively provided with a tube-side inlet (N1) and a tube-side outlet (N2); one side of the tube box (1) is connected to a shell (3); a tube sheet (2) is fixedly connected between the tube box (1) and the shell (3); a tube bundle sleeve (6) is fixedly provided inside the shell (3); a plurality of support plates (5) are fixedly provided inside the shell (3) and outside the tube bundle sleeve (6); a liquid inlet (N3) is provided on the side wall of the shell (3); a steam outlet (N4) is provided on the top of the shell (3); a heat exchange tube bundle (4) is fixedly provided inside the tube bundle sleeve (6); the heat exchange tube bundle (4) is a U-shaped tube type; a wire mesh demister (10) is provided on the steam outlet (N4) of the shell (3).

2. A steam generator according to claim 1, characterized in that: The tube bundle sleeve (6) wraps the entire heat exchange tube bundle (4), one end of the tube bundle sleeve (6) is fixedly connected to the tube plate (2), and the lower end of the tube bundle sleeve (6) is fixedly connected to the shell (3).

3. The steam generator according to claim 1, characterized in that: An opening is axially provided above the tube bundle sleeve (6), a water baffle (7) is provided on the opening, and an opening for water inlet is provided below the tube bundle sleeve (6).

4. The steam generator according to claim 1, characterized in that: The steam generator further comprises a first steam baffle (8), the lower end of the first steam baffle (8) being fixedly connected to the water baffle (7), and the upper end of the first steam baffle (8) being fixedly connected to the shell (3).

5. A steam generator according to claim 4, characterized in that: A second steam baffle (9) is connected to one side of the first steam baffle (8), and the second steam baffle (9) is placed horizontally and fixedly connected to the middle part of one side of the first steam baffle (8).

6. The steam generator according to claim 1, characterized in that: The liquid inlet (N3) is connected to a tubular liquid distributor (12).

7. A steam generator according to claim 6, characterized in that: The tubular liquid distributor (12) is fixedly connected to the liquid inlet (N3) via a 90° elbow (11).

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