Kettle type flash evaporation-reboiler

Abstract

The utility model relates to a kettle type flash evaporation-reboiler, in particular to the field of heat exchange, which comprises a kettle body and a tube box component connected with the kettle body. The interior of the kettle body is divided into a heat exchange evaporation area and a flash evaporation area through a partition plate; a first gap is formed between the bottom end of the partition plate and the bottom of the kettle body, and a second gap is formed between the top end of the partition plate and the top of the kettle body; a shell pass inlet is formed in the top of the flash evaporation area; a shell pass steam outlet is formed in the top of the heat exchange evaporation area. According to the kettle type flash evaporation-reboiler, the shell pass space is divided into the flash evaporation area and the heat exchange evaporation area by arranging the specific partition plate, the notch is formed in the bottom of the partition plate, the top of the partition plate is higher than the liquid level of the shell pass, the edge of the partition plate and the barrel are sealed in a welded mode, and the kettle type flash evaporation-reboiler integrates the functions of a flash evaporation tank and a reboiler; the utilization rate of energy is effectively improved, the equipment is more compact, the enterprise cost is reduced, and the heat recovery effect is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the field of heat exchange, in particular to a kettle type flash evaporation-reboiler. Background Art

[0002] At present, kettle reboiler is a general process equipment for heat exchange operation, which is widely used in chemical, petroleum, petrochemical, power, food, metallurgy, atomic energy and other industrial sectors to achieve heat recovery.

[0003] For example, CN106310695A discloses a kettle reboiler, comprising a box body, a plate heat exchange module located inside the box body, a junction box connected to one end of the plate heat exchange module, and a weir plate arranged perpendicular to the bottom of the box body. The overflow zone is arranged to ensure that the liquid in the evaporation zone is completely immersed in the plate heat exchange module. The overflow zone serves as a buffer zone for overflowing liquid, collects the overflowing liquid, outputs it through the liquid outlet, and then enters the evaporation zone through the liquid inlet; by arranging a partition plate that allows the medium to flow back and forth along its bend in the circumferential channel, the medium does not need to flow out of the plate and then enter the plate when realizing the bend heat exchange, and there is no need to set up a bend space on both sides of the box body.

[0004] CN112337129A discloses a kettle reboiler and a propane propylene separation tower. The kettle reboiler comprises: a shell, a hot material feed pipe, a hot material discharge pipe and a plate-fin heat exchanger; the shell is provided with a cold material inlet and a cold material outlet, the plate-fin heat exchanger can heat and vaporize the cold material entering the shell from the cold material inlet and discharge it from the cold material outlet; the hot material feed pipe is connected to the upper part of the tube layer of the plate-fin heat exchanger, and is used to input hot side gaseous material into the tube layer of the heat exchanger; the hot material discharge pipe is connected to the lower part of the tube layer of the plate-fin heat exchanger, and is used to output the liquid material condensed in the tube layer of the heat exchanger.

[0005] However, if the shell-side medium inlet pressure and inlet temperature are higher than the heat source fluid in the tube-side, the heat transfer temperature difference in the tube-shell side will be reduced, and the required heat exchange area will be increased. If the pressure reduction and temperature reduction operation is performed first, a flash tank needs to be designed separately. After passing through the flash tank, some steam will be generated, and the liquid after pressure reduction and temperature reduction will enter the kettle reboiler.

[0006] If the high-temperature and high-pressure shell-side medium directly enters the heat exchange area of ​​the kettle reboiler, there will not be enough flash time and space, which will reduce the heat transfer temperature difference of the shell and tube side, and more heat exchange area will be required to achieve it. For example, the shell-side medium inlet is 4MPaG, 180℃ liquid, and the inlet and outlet temperatures of the tube-side heat source are 120℃ and 110℃, and 100℃ saturated steam needs to be generated. If the shell-side medium directly enters the heat exchange area of ​​the kettle reboiler, the 180℃ liquid does not have enough space for flash evaporation, and the temperature of the liquid does not drop to the saturated liquid state of 100℃. Heat exchange through the heat exchange tube bundle and the tube-side heat source will cause reverse heat transfer and reduce the heat transfer temperature difference of the shell and tube side, resulting in insufficient heat exchange area and affecting the evaporation capacity. Utility Model Content

[0007] In view of the problems existing in the prior art, the purpose of the utility model is to provide a kettle type flash-reboiler to solve the problem of poor heat exchange efficiency when the existing kettle type reboiler needs flash equipment assistance or direct heat exchange for heat recovery of high temperature materials.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a kettle type flash-reboiler, which comprises a kettle body and a pipe box component connected to the kettle body;

[0010] The interior of the kettle is divided into a heat exchange evaporation zone and a flash evaporation zone by a partition;

[0011] The partition is arranged vertically at the bottom of the kettle body, the bottom end of the partition forms a first gap with the bottom of the kettle body, and the top end of the partition forms a second gap with the top of the kettle body;

[0012] A shell-side inlet is provided at the top of the flash zone;

[0013] A shell-side steam outlet is arranged at the top of the heat exchange evaporation zone.

[0014] The kettle type flash-reboiler provided by the utility model divides the shell side space into a flash zone and a heat exchange evaporation zone by arranging a specific partition, a cutout is arranged at the bottom of the partition, the top is higher than the shell side liquid level, the edge and the cylinder are sealed by welding, and the kettle type flash-reboiler combines the functions of a flash tank and a reboiler, effectively improves the utilization rate of energy, makes the equipment more compact, reduces the enterprise cost, and significantly improves the heat recovery effect.

[0015] As a preferred technical solution of the utility model, the volume of the heat exchange evaporation zone is greater than the volume of the flash evaporation zone.

[0016] As a preferred technical solution of the utility model, the pipe box component includes a pipe side inlet and a pipe side outlet which are relatively arranged.

[0017] As a preferred technical solution of the utility model, a tube sheet is arranged between the tube box component and the kettle body.

[0018] As a preferred technical solution of the utility model, the tube sheet is used to configure the heat exchange tubes arranged in the heat exchange evaporation zone.

[0019] As a preferred technical solution of the utility model, the shell-side steam outlet is provided with a defoaming device.

[0020] As a preferred technical solution of the utility model, the shell side inlet is provided with a liquid distributor.

[0021] As a preferred technical solution of the utility model, the liquid distributor is arranged higher than the maximum liquid level in the kettle.

[0022] As a preferred technical solution of the present utility model, the liquid distributor includes a flat plate distributor or a tubular distributor.

[0023] As a preferred technical solution of the utility model, the top of the partition is set higher than the maximum liquid level in the kettle.

[0024] Compared with the existing technical solutions, the utility model has the following beneficial effects:

[0025] (1) The kettle reboiler of the utility model combines a flash tank and an ordinary kettle reboiler into one, and plays the role of flash evaporation and heating evaporation at the same time. It takes up less space and is easy to operate.

[0026] (2) The kettle-type reboiler of the utility model has high heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a kettle flash-reboiler provided in an embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of the position of the shell side inlet and the partition in the embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of a plate distributor in an embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of a tubular distributor in an embodiment of the utility model.

[0031] In the figure: 1-kettle body, 1.1-partition, 1.2-heat exchange evaporation zone, 1.2.1-heat exchange tube, 1.3-flash zone, 1.3.1-shell side inlet, 1.3.2-liquid distributor, 1.4-shell side steam outlet, 1.4.1-foam removal equipment, 2-tube box components, 3-tube sheet.

[0032] The utility model is further described in detail below. However, the following examples are only simple examples of the utility model and do not represent or limit the scope of protection of the utility model. The scope of protection of the utility model shall be subject to the claims. DETAILED DESCRIPTION

[0033] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0034] This embodiment provides a kettle-type flash-reboiler, such as Figure 1 As shown, the kettle type flash-reboiler comprises a kettle body 1 and a pipe box component 2 connected to the kettle body 1;

[0035] The interior of the kettle body 1 is divided into a heat exchange evaporation zone 1.2 and a flash evaporation zone 1.3 by a partition 1.1;

[0036] The partition 1.1 is arranged vertically at the bottom of the kettle body 1, the bottom end of the partition forms a first gap with the bottom of the kettle body, and the top end of the partition forms a second gap with the top of the kettle body;

[0037] The top of the flash zone 1.3 is provided with a shell side inlet 1.3.1;

[0038] A shell-side steam outlet 1.4 is provided at the top of the heat exchange evaporation zone 1.2.

[0039] In the utility model, the widths of the first gap and the second gap can be reasonably designed according to the size of the equipment and the flow rate of the medium.

[0040] For example, when the tube bundle diameter is 1400mm, the kettle body diameter is 2400mm, and the normal liquid level is 1600mm, the top of the partition 1.1 can be set 200mm-600mm above the liquid level. Then the vertical distance between the top of the partition 1.1 and the top of the kettle body 1 is 200-600mm. At this time, the vertical distance between the bottom of the partition 1.1 and the bottom of the kettle body 1 is set to 50-500mm.

[0041] Specifically, the volume of the heat exchange evaporation zone 1.2 is greater than the volume of the flash evaporation zone 1.3.

[0042] In the present invention, the volume of the heat exchange evaporation zone 1.2 is 2-6 times the volume of the flash evaporation zone 1.3, which is calculated based on the space required for flash evaporation and the heat exchange area required for evaporation. For example, it can be 2 times, 3 times, 4 times, 5 times or 6 times, but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0043] Specifically, the pipe box component 2 includes a pipe side inlet and a pipe side outlet which are arranged opposite to each other.

[0044] In the utility model, the pipe side inlet and the pipe side outlet in the pipe box component 2 are relative, and can realize corresponding functions to each other under specific working conditions, such as the pipe side inlet is the material outlet, and the pipe side outlet is the material inlet.

[0045] Specifically, a tube sheet 3 is provided between the tube box component 2 and the kettle body 1 .

[0046] Specifically, the tube sheet 3 is used to configure the heat exchange tubes 1.2.1 arranged in the heat exchange evaporation area 1.2.

[0047] In the utility model, the heat exchange tube 1.2.1 can be in the form of a tube type such as a corrugated tube, a finned tube, a high evaporation tube, a high flux tube, etc. for enhancing evaporation outside the tube, or a tube type such as an inner wave outer threaded tube, an inner finned tube, etc. for enhancing heat transfer inside the tube, or a double-sided enhanced tube type such as an inner wave outer threaded tube, an inner fin outer corrugated tube, etc. for simultaneously enhancing heat transfer inside and outside the tube.

[0048] Specifically, the shell-side steam outlet 1.4 is provided with a defoaming device 1.4.1.

[0049] In the present invention, the defoaming device 1.4.1 is a defoaming device commonly used in the art, such as a defoaming device with a mesh or a wire mesh.

[0050] Specifically, the shell side inlet 1.3.1 is equipped with a liquid distributor 1.3.2, such as Figure 2 As shown;

[0051] Specifically, the liquid distributor 1.3.2 is set higher than the maximum liquid level in the kettle body 1.

[0052] Specifically, the liquid distributor 1.3.2 includes a flat plate distributor or a tubular distributor.

[0053] In the present invention, the liquid distributor 1.3.2 can be a flat plate or a distribution pipe, such as Figure 3 and Figure 4 As shown, there are several small holes or nozzles on it, which can evenly disperse the high-pressure fluid. Since the temperature and pressure of the liquid are higher than the steam pressure in the shell space, the liquid flashes, part of which flashes into low-temperature and low-pressure steam, and part of which flashes into low-temperature and low-pressure saturated liquid.

[0054] Specifically, the top of the partition 1.1 is set higher than the maximum liquid level in the kettle body 1.

[0055] In the utility model, the kettle type reboiler is not provided with other material ports except the listed inlet and outlet.

[0056] In the present invention, the top and bottom of the kettle body 1 are relative and can be changed accordingly according to the setting position of the kettle body 1.

[0057] In the utility model, the bottom and the top of the kettle body 1 are based on the long section of the kettle reboiler being placed horizontally.

[0058] In the present invention, the maximum liquid level of the kettle body 1 is to ensure that the liquid level immerses the tube bundle. Exemplarily, it is 100-300mm higher than the heat exchange tube bundle, such as 100mm, 200mm or 300mm, but is not limited to the listed values. Other values ​​not listed in this range also meet the requirements.

[0059] Further, in order to illustrate the excellent effects of the kettle flash-reboiler provided by the utility model, actual examples are used for illustration, as follows:

[0060] Example 1

[0061] This embodiment provides a kettle type flash-reboiler, which comprises a kettle body 1 and a pipe box component 2 connected to the kettle body 1;

[0062] The interior of the kettle body 1 is divided into a heat exchange evaporation zone 1.2 and a flash evaporation zone 1.3 by a partition 1.1;

[0063] The partition 1.1 is arranged vertically at the bottom of the kettle body 1, the vertical distance between the bottom end of the partition 1.1 and the bottom of the kettle body 1 is 100 mm, and the vertical distance between the top end of the partition 1.1 and the top of the kettle body 1 is 400 mm, wherein the tube bundle diameter is 1400 mm, the kettle body diameter is 2400 mm, and the normal liquid level is 1600 mm.

[0064] The top of the flash zone 1.3 is provided with a shell side inlet 1.3.1;

[0065] A shell-side steam outlet 1.4 is provided at the top of the heat exchange evaporation zone 1.2.

[0066] Among them, the volume of the heat exchange evaporation zone 1.2 is greater than the volume of the flash evaporation zone 1.3, and the volume of the heat exchange evaporation zone 1.2 is 4 times the volume of the flash evaporation zone 1.3; the pipe box component 2 includes a tube side inlet and a tube side outlet arranged relatively; a tube sheet 3 is arranged between the pipe box component 2 and the kettle body 1; the tube sheet 3 is used to configure the heat exchange tube 1.2.1 arranged in the heat exchange evaporation zone 1.2; the shell side steam outlet 1.4 is equipped with a defoaming device 1.4.1; the shell side inlet 1.3.1 is equipped with a liquid distributor 1.3.2; the liquid distributor 1.3.2 is higher than the maximum liquid level setting in the kettle body 1; the liquid distributor 1.3.2 is a flat plate distributor; the top of the partition 1.1 is higher than the maximum liquid level setting in the kettle body 1.

[0067] Application Example 1

[0068] This application example provides a specific application process of the kettle flash-reboiler described in Example 1, and the specific process is as follows:

[0069] The shell side inlet is 180℃, 4MPaG material, and the flow rate is 12000kg / h. The shell side outlet is 100kPaG, 100℃ saturated steam. The material enters the liquid distributor 1.3.2 from the shell side inlet 1.3.1, and the liquid distributor can evenly distribute the material to the top of the flash zone 1.3. The material will flash out 1800kg / h of 100℃ saturated steam and 10200kg / h of 100℃ saturated liquid in the flash zone 1.3. The saturated steam enters the top of the evaporation zone 1.2 from the channel between the top of the partition and the top of the kettle body 1, and then flows out from the shell side steam outlet 1.4. The temperature of the material gradually decreases during the descent process, and the material continues to flash and cool down under the liquid surface of the flash zone 1.3. The liquid phase at the bottom of the flash zone 1.3 has been fully flashed and turned into a saturated liquid at 100°C. It enters the bottom of the evaporation zone 1.2 from the channel at the bottom of the partition and the bottom of the kettle body 1, and after being heated by the hot fluid in the heat exchange tube bundle, it evaporates and turns into saturated steam, escapes from the evaporation zone 1.2, and the entrained droplets are removed by the demister 1.4.1, and then flows out from the shell side steam outlet 1.4.

[0070] Comparative Example 1

[0071] The only difference from Application Example 1 is that the vertical distance between the bottom end of the partition and the bottom of the kettle body is 0 mm, that is, the partition and the bottom of the kettle body are in contact and liquid cannot pass through.

[0072] At this time, since the material cannot pass through the baffle and the bottom of the kettle body, the material will enter the evaporation zone 1.2 from the top of the baffle. At this time, the material has not fully flashed and the temperature of the material is higher than 100°C. The temperature of the material dropped from 180°C to 160°C, and the temperature of the hot fluid in the heat exchange tube bundle is 120°C. At this time, the heat transfer from the heat exchange tube bundle to the material cannot be achieved, and the heat exchange area is wasted. The temperature of the material dropped from 180°C to 115°C, and the temperature of the hot fluid in the heat exchange tube bundle is 120°C, and the heat transfer temperature difference becomes 5°C. The method of the utility model can make the heat transfer temperature difference 20°C, and the heat exchange area required for evaporation of the two structures differs by 4 times. The reduction of the heat transfer temperature difference in the shell and tube makes the heat exchange area insufficient, affecting the evaporation amount.

[0073] Comparative Example 2

[0074] The only difference from Application Example 1 is that the shell side inlet of the flash zone is arranged at the bottom, that is, the material is fed from the bottom of the kettle body.

[0075] At this time, since the material temperature is 180°C and the temperature of the hot fluid in the heat exchange tube bundle is 120°C, heat cannot be transferred from the heat exchange tube bundle to the material, and even reverse heat exchange occurs. The heat exchange area is wasted and the purpose of evaporation cannot be achieved.

[0076] It is stated that the utility model uses the above embodiments to illustrate the detailed structural features of the utility model, but the utility model is not limited to the above detailed structural features, that is, it does not mean that the utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to the utility model, equivalent replacement of the components selected by the utility model, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

[0077] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0078] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0079] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A kettle type flash-reboiler, characterized in that: The kettle type flash-reboiler comprises a kettle body and a pipe box component connected to the kettle body; The interior of the kettle is divided into a heat exchange evaporation zone and a flash evaporation zone by a partition; The partition is arranged vertically at the bottom of the kettle body, the bottom end of the partition forms a first gap with the bottom of the kettle body, and the top end of the partition forms a second gap with the top of the kettle body; A shell-side inlet is provided at the top of the flash zone; A shell-side steam outlet is arranged at the top of the heat exchange evaporation zone.

2. The kettle type flash-reboiler according to claim 1, characterized in that: The volume of the heat exchange evaporation zone is greater than the volume of the flash evaporation zone.

3. The kettle type flash-reboiler according to claim 1, characterized in that: The pipe box component comprises a pipe side inlet and a pipe side outlet which are arranged opposite to each other.

4. The kettle type flash-reboiler according to claim 1, characterized in that: A tube sheet is arranged between the tube box component and the kettle body.

5. The kettle type flash-reboiler according to claim 4, characterized in that: The tube sheet is used to configure the heat exchange tubes arranged in the heat exchange evaporation zone.

6. The kettle type flash-reboiler according to claim 1, characterized in that: The shell side steam outlet is provided with a defoaming device.

7. The kettle type flash-reboiler according to claim 1, characterized in that: The shell side inlet is provided with a liquid distributor.

8. The kettle type flash-reboiler according to claim 7, characterized in that: The liquid distributor is set higher than the maximum liquid level in the kettle.

9. The kettle type flash-reboiler according to claim 7 or 8, characterized in that: The liquid distributor includes a flat plate distributor or a tubular distributor.

10. The kettle type flash-reboiler according to claim 1 or 8, characterized in that: The top of the partition is set higher than the maximum liquid level in the kettle.

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