A vapor-liquid separation system

Abstract

The utility model relates to a kind of vapor-liquid separation systems, including separator body, cyclone and external demister device;External demister device is provided with demister, demister separates into steam inlet cavity and steam outlet cavity in external demister device;The one end of external demister device is provided with secondary steam inlet, the bottom of external demister device is provided with second entrainment liquid outlet, the other end of external demister device is provided with purified steam outlet;Secondary steam inlet and second entrainment liquid outlet are all connected steam inlet cavity, and purified steam outlet connects steam outlet cavity;The evaporation steam outlet of separator body is connected the evaporation steam inlet of cyclone;The secondary steam outlet of cyclone is connected secondary steam inlet;The utility model is by being external to demister and being additionally cyclone between separator body and external demister device, can improve demisting efficiency and reduce demister load, to reduce demister flushing frequency, reduce separator cost.

Description

Technical Field

[0001] This utility model relates to the technical field of evaporation separation, specifically to a vapor-liquid separation system. Background Technology

[0002] In evaporation technology, the secondary steam at the separator outlet contains a large number of entrained droplets, which can affect the quality of condensate after entering subsequent processes. Currently, commonly used demisting methods include wire mesh demisters, baffle demisters, and cyclone demisters, which are generally installed at the top of the separator.

[0003] This type of demister structure, on the one hand, occupies the gas phase space of the separator, increasing the separator's height; on the other hand, it increases the load on the demister due to the need to intercept a large number of droplets. Especially in crystallization separators containing solids, the high load leads to severe salt buildup on the demister, requiring frequent flushing and increasing the system's throughput. If flushing is not timely, there is also a risk that the increased weight of the salt buildup on the demister may lead to insufficient strength and collapse. Utility Model Content

[0004] Based on the above description, this utility model provides a vapor-liquid separation system. By placing the demister externally and adding a cyclone separator between the separator body and the external demister, the demister efficiency can be improved and the demister load can be reduced, thereby reducing the number of demister flushing cycles and lowering the separator cost.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a vapor-liquid separation system, including a separator body, a cyclone separator and an external demister;

[0006] The top of the separator body is provided with an evaporation steam outlet;

[0007] The cyclone separator has an evaporating steam inlet tangentially arranged on one side, a secondary steam outlet arranged at the top of the cyclone separator, and a first entrained liquid outlet arranged at the bottom of the cyclone separator;

[0008] The external demister is equipped with a demister that divides its interior into an inlet chamber and an outlet chamber. One end of the external demister has a secondary steam inlet, the bottom has a second entrained liquid outlet, and the other end has a purified steam outlet. Both the secondary steam inlet and the second entrained liquid outlet are connected to the inlet chamber, and the purified steam outlet is connected to the outlet chamber.

[0009] The evaporation steam outlet is connected to the evaporation steam inlet via an evaporation steam pipe; the secondary steam outlet is connected to the secondary steam inlet via a secondary steam pipe.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the first entrained liquid outlet is connected to the bottom of one side of the separator body via a first reflux pipe.

[0012] Furthermore, the second entrained liquid outlet is connected to the bottom of one side of the separator body via a second reflux pipe.

[0013] Furthermore, the vapor-liquid separation system also includes a flushing device, which includes an inlet pipe and an outlet flushing pipe. The outlet flushing pipe is disposed in the outlet chamber and connected to the inlet pipe. The outlet flushing pipe is equipped with outlet flushing nozzles, all of which face the demister. The bottom of the external demister is provided with an outlet flushing liquid outlet, which is connected to the outlet chamber.

[0014] Furthermore, a solenoid valve is installed on the water inlet pipe; an inlet steam pressure sensor is installed in the steam inlet chamber, and an outlet steam pressure sensor is installed in the steam outlet chamber; both the inlet steam pressure sensor and the outlet steam pressure sensor are connected to a differential pressure controller, and the differential pressure controller is electrically connected to the solenoid valve.

[0015] Furthermore, the flushing device also includes a steam inlet flushing pipe, which is disposed in the steam inlet chamber and connected to the water inlet pipe. The steam inlet flushing pipe is provided with steam inlet flushing nozzles, all of which face the demister.

[0016] Furthermore, the external demister also includes a three-way valve, which has a first end, a second end, and a third end. The first end is connected to the second entrained liquid outlet, the second end is connected to the bottom of one side of the separator body through a second return pipe, and the third end is provided with a steam inlet flushing liquid outlet. The three-way valve is used to connect the first end to the second end, or to connect the first end to the third end.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0018] 1. This utility model improves the demisting efficiency and reduces the load on the demister by placing the demister externally and adding a cyclone separator between the separator body and the external demister device, thereby reducing the number of times the demister needs to be flushed.

[0019] 2. By placing the demister externally, the height of the gas phase space in the separator can be reduced, thus lowering the cost of the separator.

[0020] 3. The electric valve is automatically controlled by detecting the pressure difference between the steam inlet chamber and the steam outlet chamber. When the demister is blocked, the pressure in the steam inlet chamber increases, which increases the pressure difference. This enables the flushing device to automatically flush the demister in a timely manner, which can reduce the frequency of demister blockage and extend the service life of the demister.

[0021] 4. Flushing the demister from both sides of the steam inlet and outlet chambers can improve the flushing effect of the demister. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a vapor-liquid separation system provided in Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the external defoaming device in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a vapor-liquid separation system provided in Embodiment 2 of this utility model;

[0025] Figure 4 This is a schematic diagram of the external defoaming device in Embodiment 2 of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of a vapor-liquid separation system provided in Embodiment 3 of this utility model;

[0027] Figure 6 This is a schematic diagram of the external defoaming device in Embodiment 3 of this utility model;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Separator body; 11. Evaporated steam outlet; 2. Evaporated steam pipe; 3. Cyclone separator; 31. Evaporated steam inlet; 32. Secondary steam outlet; 33. First entrained liquid outlet; 4. Secondary steam pipe; 5. External demister; 51. Demister; 52. Steam inlet chamber; 53. Steam outlet chamber; 54. Secondary steam inlet; 55. Purified steam outlet; 56. Second entrained liquid outlet; 57. Three-way valve; 58. Steam inlet flushing liquid outlet; 59. Steam outlet flushing liquid outlet; 6. Flushing device; 61. Water inlet pipe; 62. Electric valve; 63. Steam inlet flushing pipe; 64. Steam inlet flushing nozzle; 65. Steam outlet flushing pipe; 66. Steam outlet flushing nozzle; 67. Steam inlet pressure sensor; 68. Steam outlet pressure sensor; 69. Differential pressure controller; 7. First return pipe; 8. Second return pipe. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0033] Example 1

[0034] A vapor-liquid separation system includes a separator body 1, a cyclone separator 3, and an external demister 5.

[0035] The top of the separator body 1 is provided with an evaporation steam outlet 11.

[0036] A steam inlet 31 is provided tangentially on one side of the cyclone separator 3, a secondary steam outlet 32 ​​is provided at the top of the cyclone separator 3, and a first entrained liquid outlet 33 is provided at the bottom of the cyclone separator 3.

[0037] An external demister 5 is equipped with a demister 51, which divides the interior of the external demister 5 into an inlet chamber 52 and an outlet chamber 53. A secondary steam inlet 54 is located at one end of the external demister 5, a second entrained liquid outlet 56 is located at the bottom of the external demister 5, and a purified steam outlet 55 is located at the other end of the external demister 5. Both the secondary steam inlet 54 and the second entrained liquid outlet 56 are connected to the inlet chamber 52, and the purified steam outlet 55 is connected to the outlet chamber 53.

[0038] In this embodiment, the demister 51 can be a wire mesh demister or a baffle plate demister.

[0039] Evaporated steam outlet 11 is connected to evaporated steam inlet 31 via evaporated steam pipe 2. Secondary steam outlet 32 ​​is connected to secondary steam inlet 54 via secondary steam pipe 4.

[0040] The secondary steam coming out of the separator body 1 enters the cyclone separator 3 tangentially through the steam pipe 2. The cyclone separator 3 separates some of the liquid droplets entrained in the secondary steam, and the entrained liquid separated by the cyclone separator 3 is discharged through the first entrained liquid outlet 33 at the bottom.

[0041] The secondary steam coming out of the top of the cyclone separator 3 enters the external demister 5 axially through the secondary steam pipe 4. The remaining droplets are removed by the demister 51, and the separated entrained liquid is discharged through the second entrained liquid outlet 56 at the bottom.

[0042] The entrained liquid discharged from the cyclone separator 3 and the external demister 5 can be collected in a separate storage tank or returned to the liquid phase space of the separator 1. In this embodiment, the first entrained liquid outlet 33 is connected to the bottom of one side of the separator body 1 through the first return pipe 7, and the second entrained liquid outlet 56 is connected to the bottom of one side of the separator body 1 through the second return pipe 8, thereby returning the entrained liquid separated by the cyclone separator 3 and the external demister 5 to below the liquid surface inside the separator body 1, realizing resource recycling and avoiding waste.

[0043] This embodiment improves demisting efficiency and reduces the load on the demister by placing the demister 51 externally and adding a cyclone separator 3 between the separator body 1 and the external demister 5, thereby reducing the number of times the demister 51 needs to be flushed. Furthermore, placing the demister 51 externally reduces the height of the gas phase space in the separator and lowers the separator cost.

[0044] Example 2

[0045] The difference between this embodiment and Embodiment 1 is that the gas-liquid separation system in this embodiment further includes a flushing device 6. The flushing device 6 includes a water inlet pipe 61 and a steam outlet flushing pipe 65. The steam outlet flushing pipe 65 is disposed in the steam outlet chamber 53 and connected to the water inlet pipe 61. The steam outlet flushing pipe 65 is provided with a steam outlet flushing nozzle 66, and all the steam outlet flushing nozzles 66 face the demister 51.

[0046] In addition, a solenoid valve 62 is installed on the water inlet pipe 61. An inlet steam pressure sensor 67 is installed in the steam inlet chamber 52, and an outlet steam pressure sensor 68 is installed in the steam outlet chamber 53. Both the inlet steam pressure sensor 67 and the outlet steam pressure sensor 68 are connected to a differential pressure controller 69, which is electrically connected to the solenoid valve 62.

[0047] The bottom of the external demister 5 is provided with a steam outlet flushing liquid outlet 59, which is connected to the steam outlet chamber 53.

[0048] In this embodiment, the electric valve 62 is automatically controlled by detecting the pressure difference between the steam inlet chamber 52 and the steam outlet chamber 53. When the demister 51 is blocked, the pressure in the steam inlet chamber 52 increases, which increases the pressure difference. This enables the flushing device 6 to automatically flush the demister 51 in a timely manner, thereby reducing the frequency of demister 51 blockage and extending the service life of the demister 51.

[0049] In this embodiment, the demister 51 is flushed only on the steam outlet chamber 53 side, which can prevent the flushing liquid from flowing into the separator body 1 through the second return pipe 8.

[0050] Example 3

[0051] The difference between this embodiment and embodiment two is that the flushing device 6 further includes a steam inlet flushing pipe 63, which is disposed in the steam inlet chamber 52 and connected to the water inlet pipe 61. A steam inlet flushing nozzle 64 is provided on the steam inlet flushing pipe 63, and all the steam inlet flushing nozzles 64 face the demister 51.

[0052] The external demister 5 also includes a three-way valve 57, which has a first end, a second end, and a third end. The first end is connected to the second entrained liquid outlet 56, the second end is connected to the bottom of one side of the separator body 1 through the second return pipe 7, and the third end is provided with a steam inlet flushing liquid outlet 58. The three-way valve is used to connect the first end to the second end, or to connect the first end to the third end. The differential pressure controller 69 is electrically connected to the three-way valve 57.

[0053] In this embodiment, the demister 51 is flushed from both sides of the steam inlet chamber 52 and the steam outlet chamber 53, which can improve the flushing effect of the demister 51.

[0054] In addition, under normal circumstances, the second entrained liquid outlet 56 and the second return pipe 7 are connected through the three-way valve 57, so that the entrained liquid separated by the demister 51 can return smoothly to the separator body 1. When flushing the demister 51, the connection between the second entrained liquid outlet 56 and the second return pipe 7 is disconnected through the three-way valve 57, and the second entrained liquid outlet 56 and the steam inlet flushing liquid outlet 58 are connected, so that the flushing liquid flushing the demister 51 in the steam inlet chamber 52 is discharged through the steam inlet flushing liquid outlet 58, preventing the flushing liquid from flowing into the separator body 1 through the second return pipe 7.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vapor-liquid separation system, characterized by, Includes the separator body, cyclone separator, and external demister; The top of the separator body is provided with an evaporation steam outlet; The cyclone separator has an evaporating steam inlet tangentially arranged on one side, a secondary steam outlet arranged at the top of the cyclone separator, and a first entrained liquid outlet arranged at the bottom of the cyclone separator; The external demister is equipped with a demister that divides its interior into an inlet chamber and an outlet chamber. One end of the external demister has a secondary steam inlet, the bottom has a second entrained liquid outlet, and the other end has a purified steam outlet. Both the secondary steam inlet and the second entrained liquid outlet are connected to the inlet chamber, and the purified steam outlet is connected to the outlet chamber. The evaporation steam outlet is connected to the evaporation steam inlet via an evaporation steam pipe; the secondary steam outlet is connected to the secondary steam inlet via a secondary steam pipe.

2. A vapor-liquid separation system according to claim 1, wherein, The first entrained liquid outlet is connected to the bottom of one side of the separator body through a first return pipe.

3. A vapor-liquid separation system according to claim 1, wherein, The second entrained liquid outlet is connected to the bottom of one side of the separator body via a second reflux pipe.

4. A vapor-liquid separation system according to claim 1, wherein, It also includes a flushing device, which includes a water inlet pipe and a steam outlet flushing pipe. The steam outlet flushing pipe is located inside the steam outlet chamber and connected to the water inlet pipe. The steam outlet flushing pipe is equipped with steam outlet flushing nozzles, all of which face the demister. The bottom of the external demister is provided with a steam outlet flushing liquid outlet, which is connected to the steam outlet chamber.

5. A vapour-liquid separation system according to claim 4, wherein, A solenoid valve is installed on the water inlet pipe; a steam inlet pressure sensor is installed in the steam inlet chamber, and a steam outlet pressure sensor is installed in the steam outlet chamber; both the steam inlet pressure sensor and the steam outlet pressure sensor are connected to a differential pressure controller, and the differential pressure controller is electrically connected to the solenoid valve.

6. A vapor-liquid separation system according to claim 4, wherein, The flushing device also includes a steam inlet flushing pipe, which is disposed in the steam inlet chamber and connected to the water inlet pipe. The steam inlet flushing pipe is equipped with steam inlet flushing nozzles, all of which face the demister.

7. A vapour-liquid separation system according to claim 6, wherein, The external demister also includes a three-way valve, which has a first end, a second end, and a third end. The first end is connected to the second entrained liquid outlet, the second end is connected to the bottom of one side of the separator body through a second return pipe, and the third end is provided with a steam inlet flushing liquid outlet. The three-way valve is used to connect the first end to the second end or to connect the first end to the third end.

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