Evaporative crystallization system for external gas-liquid-water separation demister

Abstract

The utility model discloses an evaporative crystallization system for an external gas-liquid-water separation demister, particularly relates to the field of evaporative crystallization, and can solve the problems that in the prior art, when an existing demister is blocked, the equipment load can be seriously increased, and the structure is inconvenient to clean. Gas-liquid separation of secondary steam can be more effectively achieved through the external defoaming device, entrainment of raw material liquid in the secondary steam is reduced, so that pipeline corrosion and pipeline blockage possibly caused by entrainment liquid are avoided, and the annular washing pipe arranged in the defoaming device can further improve the equipment cleaning efficiency.

Description

Technical Field

[0001] The utility model relates to the field of evaporation and crystallization, in particular to an evaporation and crystallization system for an external gas-liquid-water separation and defoamer. Background Art

[0002] Evaporation crystallization equipment is widely used in product manufacturing and wastewater treatment in the chemical industry, as well as in the non-ferrous metal industry, pesticide industry, food industry, pharmaceutical industry, ammonia desulfurization, mining and smelting, steel mills, oil fields and other industries. Through the evaporation crystallization process, crystalline products can be obtained, and various inorganic salts dissolved in wastewater can be extracted and recovered, deepening pure environmental protection management and standard emission into environmental protection management and comprehensive utilization, which can significantly improve the efficiency of the production system.

[0003] At present, there are three commonly used demisters: baffle plate type, wire mesh, and centrifugal type; the baffle plate demister has a small pressure drop and is not easy to clog, but can only filter relatively large droplets or steam foam; the wire mesh demister has a better filtering effect than the baffle plate demister, but if the medium contains dust, it will clog and need to be cleaned regularly or sprayed by a spray device; the centrifugal demister has a simple structure and is easy to use, but the demisting effect is average; installing a demister in a gas-liquid two-phase flow device will lead to an increase in pressure drop, especially when the demister is clogged, the equipment pressure drop will increase significantly, which will seriously increase the equipment load and even cause the demister to fall off: in addition, the demister needs to be cleaned regularly, and the existing structure is cumbersome to clean, requiring shutdown for cleaning, which reduces production efficiency.

[0004] In order to solve the above problems, the utility model provides an evaporation crystallization system for an external gas-liquid-water separation demister. Utility Model Content

[0005] In order to solve the problem in the prior art that when the existing demister is blocked, the equipment load will be seriously increased and the structure will be inconvenient to clean, the present application provides an external gas-liquid water separation demister used in an evaporation crystallization system, which can more effectively realize the gas-liquid separation of secondary steam through the external demister, reduce the entrainment of raw liquid in the secondary steam, thereby avoiding pipeline corrosion and blockage caused by the entrained liquid, and the annular washing pipe arranged inside the demister can also improve the efficiency of equipment cleaning.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is:

[0007] An evaporation crystallization system for an external gas-liquid-water separation demister comprises a condenser and an evaporator, wherein the outer wall and the bottom of the evaporator are respectively provided with a feeding pipe and a liquid outlet pipe, the top of the evaporator is also connected to a demister via a first guide pipe, the top of the demister is provided with an air outlet pipe, the air outlet pipe is communicated with the condenser, the bottom of the demister is also connected to a second guide pipe, the second guide pipe is communicated with the lower part of the evaporator.

[0008] As a further improvement of the utility model, the defoaming device includes a defoaming cylinder, which is cylindrical in the middle and dome-shaped at both ends. A plurality of washing pipes for spraying and flushing the inner wall of the defoaming cylinder are also arranged inside the defoaming cylinder.

[0009] As a further improvement of the present invention, the washing pipe is an annular pipeline, the washing pipe is arranged at the upper end of the inner wall of the defoaming cylinder, and the inner wall surface of the washing pipe is provided with a plurality of spray openings along the annular circumference.

[0010] As a further improvement of the utility model, the evaporator as a whole is composed of a middle cylindrical body, a dome cover at the upper end and a frustum cover at the lower end. The top surface of the dome cover at the upper end of the evaporator is welded to a first interface pipe, the outer wall surface of the foam tube is welded to a third interface pipe, and the first guide pipe is threaded between the first interface pipe and the third interface pipe.

[0011] As a further improvement of the utility model, the bottom surface of the defoamer cylinder is welded with a second interface pipe, the outer wall surface of the evaporator is welded with a fourth interface pipe, and the second guide pipe is threadedly connected between the second interface pipe and the fourth interface pipe.

[0012] In summary, compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0013] 1. In the present application, the evaporator cooperates with an externally connected defoaming device to more effectively achieve gas-liquid separation of the secondary steam and reduce the entrainment of the raw material liquid in the secondary steam. The secondary steam enters the defoaming device from the top of the evaporator through a conduit, and gas-liquid separation is performed in the defoaming device. The separated gas portion passes through the top of the defoaming device to the condenser for condensation, and the liquid portion flows back to the evaporation tank, thereby avoiding pipeline corrosion and blockage that may be caused by entrained liquid.

[0014] 2. In the present application, the double-layer annular washing pipe arranged on the inner wall of the cylinder of the defoaming device can also improve the efficiency of equipment cleaning. The washing water of the annular washing pipe is secondary steam condensate, which can effectively prevent the introduction of new impurities. During the washing operation, the double-layer annular washing pipe can also spray the cylinder 360°. The double-layer design can not only ensure the efficiency and quality of washing, but also reduce the scaling of the inner wall of the cylinder that may be caused by secondary steam entrainment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is the front view of the utility model.

[0017] Figure 2 yes Figure 1 A partial enlarged view of area A in the middle.

[0018] Figure 3 yes Figure 1 A partial enlarged view of area B in the middle.

[0019] Figure 4 yes Figure 1 A partial enlarged view of area C in the middle.

[0020] Figure 5 yes Figure 1 A partial enlarged view of area D in the middle.

[0021] In the figure: 1. feeding pipe; 2. evaporator; 3. first guide pipe; 4. defoaming device; 41. defoaming cylinder; 42. washing pipe; 5. air outlet pipe; 6. second guide pipe; 7. liquid outlet pipe; 8. first interface pipe; 9. second interface pipe; 10. third interface pipe; 11. fourth interface pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] Example:

[0029] Combined with the accompanying drawings Figure 1-Figure 5 An evaporation crystallization system for an external gas-liquid-water separation demister is shown, comprising a condenser and an evaporator 2, wherein the outer wall and the bottom of the evaporator 2 are respectively provided with a feeding pipe 1 and a liquid outlet pipe 7, the top of the evaporator 2 is also connected to a demister 4 via a first guide pipe 3, the top of the demister 4 is provided with an air outlet pipe 5, the air outlet pipe 5 is communicated with the condenser, the bottom of the demister 4 is also connected to a second guide pipe 6, the second guide pipe 6 is communicated with the lower part of the evaporator 2.

[0030] Brief description of working principle:

[0031] The core principle is to use the different specific gravities of the secondary steam gas and liquid. When the secondary steam gas and liquid enter the evaporator 2, the flow rate begins to decrease. In the process of the main fluid turning, the fine droplets in the gas phase sink and separate from the gas. The separated gas part passes through the top of the defoaming device 4 to the condenser for condensation, and the liquid part flows back to the evaporation tank. A double-layer annular washing pipe 42 is arranged on the inner wall of the cylinder of the defoaming device 4. During the washing operation, the cylinder can be sprayed 360° to reduce the scaling of the inner wall of the cylinder that may be caused by the entrainment of secondary steam.

[0032] According to the instructions attached Figure 1-Figure 5 As shown, the defoaming device 4 includes a defoaming cylinder 41, which is cylindrical in the middle and dome-shaped at both ends. A plurality of washing pipes 42 for spraying and flushing the inner wall are arranged inside the defoaming cylinder 41. The washing pipe 42 is an annular pipeline, which is arranged at the upper end of the inner wall of the defoaming cylinder 41, and the inner wall surface of the washing pipe 42 is provided with a plurality of spray ports along the annular circumference. It can be seen from the above structure that the double-layer annular washing pipe 42 arranged on the inner wall of the cylinder of the defoaming device 4 can also improve the efficiency of equipment cleaning, wherein the washing water of the annular washing pipe 42 is secondary steam condensate, which can effectively prevent the introduction of new impurities. When performing the washing operation, the double-layer annular washing pipe 42 can also spray the cylinder 360°. The double-layer design can not only ensure the efficiency and quality of washing, but also reduce the scaling of the inner wall of the cylinder that may be caused by the entrainment of secondary steam.

[0033] It is worth mentioning that the evaporator 2 as a whole is composed of a cylindrical body in the middle, a dome cover at the upper end and a conical cover at the lower end. The top surface of the dome cover at the upper end of the evaporator 2 is welded with a first interface pipe 8, the outer wall surface of the defoaming cylinder 41 is welded with a third interface pipe 10, the first guide pipe 3 is screwed between the first interface pipe 8 and the third interface pipe 10, the bottom surface of the defoaming cylinder 41 is welded with a second interface pipe 9, the outer wall surface of the evaporator 2 is welded with a fourth interface pipe 11, the second guide pipe 6 is screwed between the second interface pipe 9 and the fourth interface pipe 11, and each interface pipe is screwed with the first guide pipe 3 and the second guide pipe 6. When different guide pipes and components connected to the guide pipes are damaged, they can be repaired or replaced in time to avoid long shutdowns, thereby ensuring work efficiency.

[0034] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An evaporation crystallization system for an external gas-liquid-water separation and defoamer, comprising a condenser and an evaporator (2), characterized in that: The outer wall and bottom of the evaporator (2) are respectively provided with a feeding pipe (1) and a liquid outlet pipe (7); the top of the evaporator (2) is also connected to a defoaming device (4) via a first guide pipe (3); the top of the defoaming device (4) is provided with an air outlet pipe (5); the air outlet pipe (5) is connected to the condenser; the bottom of the defoaming device (4) is also connected to a second guide pipe (6); the second guide pipe (6) is connected to the lower part of the evaporator (2).

2. The evaporation crystallization system for an external gas-liquid-water separation demister as claimed in claim 1, characterized in that: The defoaming device (4) comprises a defoaming cylinder (41), the middle of the defoaming cylinder (41) is cylindrical and the two ends are dome-shaped. A plurality of washing pipes (42) for spraying and washing the inner wall of the defoaming cylinder (41) are also arranged inside the defoaming cylinder (41).

3. The evaporation crystallization system for an external gas-liquid-water separation demister as claimed in claim 2, characterized in that: The washing pipe (42) is an annular pipeline, and the washing pipe (42) is arranged at the upper end of the inner wall of the defoaming cylinder (41), and the inner wall surface of the washing pipe (42) is provided with a plurality of spray openings along the annular circumference.

4. The evaporation crystallization system for an external gas-liquid-water separation demister as claimed in claim 3, characterized in that: The evaporator (2) as a whole is composed of a cylindrical body in the middle, a dome cover at the upper end and a frustum cover at the lower end. The top surface of the dome cover at the upper end of the evaporator (2) is welded to a first interface pipe (8), the outer wall surface of the defoaming cylinder (41) is welded to a third interface pipe (10), and the first flow guide pipe (3) is screwed between the first interface pipe (8) and the third interface pipe (10).

5. The evaporation crystallization system for an external gas-liquid-water separation demister as claimed in claim 4, characterized in that: The bottom surface of the defoaming cylinder (41) is welded to a second interface pipe (9), the outer wall surface of the evaporator (2) is welded to a fourth interface pipe (11), and the second flow guide pipe (6) is screwed between the second interface pipe (9) and the fourth interface pipe (11).

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