Special gas-liquid separator for phosphorous acid refining falling film evaporator

Abstract

The utility model discloses a special gas-liquid separator for a phosphorous acid refining falling film evaporator, which relates to the technical field of phosphorous acid preparation and comprises an outer shell, structured packing, bulk packing, a rotational flow plate, an inner insertion pipeline and a gas phase buffer chamber, the top of the outer shell is closed, and the bottom of the outer shell is open and used for being connected with the falling-film evaporator. Regular packing, bulk packing and a rotational flow plate are sequentially arranged in the outer shell from bottom to top, and a continuous demisting layer is formed by the regular packing, the bulk packing and the rotational flow plate; the side part of the outer shell is provided with an internally-inserted pipeline for discharging gas, the gas inlet end of the internally-inserted pipeline is positioned above the demisting layer, and a gas-phase buffer chamber is formed between the internally-inserted pipeline and the top of the outer shell. According to the utility model, the entrainment amount in the operation process of the phosphorous acid refining falling film evaporator is reduced, the problem of poor dehydration and deacidification effects caused by entrainment of the falling film evaporator in the phosphorous acid refining process is effectively solved, and the use effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of phosphorous acid preparation, and particularly relates to a gas-liquid separator special for phosphorous acid refining falling film evaporator. BACKGROUND

[0002] In the process of preparing phosphorous acid from phosphorus trichloride, the concentration of reaction liquid is different from the concentration of other salt-containing water, because the reaction liquid contains phosphorous acid, water and hydrogen chloride, in order to ensure the quality of subsequent phosphorous acid products, the water and hydrogen chloride in the reaction liquid need to be completely removed.

[0003] The existing phosphorous acid reaction liquid evaporation concentration refining falling film evaporator has large instantaneous evaporation capacity and large gas-liquid entrainment, which can easily cause the accumulation of acid liquid in the gas phase pipeline, and finally lead to poor dehydration and deacidification effect; in addition, the feeding amount needs to be strictly controlled, when the feeding amount suddenly increases or the vacuum fluctuates obviously, it is easy to cause material flushing, and the phosphorous acid can enter the subsequent gas phase pipeline and hydrogen chloride absorption system with the evaporated material, which affects the dehydration and deacidification effect and the quality of the absorbed hydrochloric acid; in addition, the falling film evaporator is a tube type heat exchanger structure, and it is impossible to add a demister at the top during manufacturing. SUMMARY

[0004] The utility model discloses a gas-liquid separator special for phosphorous acid refining falling film evaporator is provided to solve the problems in the prior art.

[0005] The utility model discloses a gas-liquid separator special for phosphorous acid refining falling film evaporator is provided to solve the problems in the prior art.

[0006] A gas-liquid separator special for phosphorous acid refining falling film evaporator, including shell body, regular filling, bulk filling, cyclone plate, internal pipe and gas phase buffer room, the bottom of the closed top of shell body is arranged, and is used for connecting with falling film evaporator, and is arranged in the shell body from bottom to top in turn regular filling, bulk filling and cyclone plate, and regular filling, bulk filling and cyclone plate form continuous demisting layer, and the side of shell body is provided with internal pipe for gas discharge, and the gas inlet end of internal pipe is above demisting layer, and the gas phase buffer room is formed between internal pipe and the top of shell body.

[0007] The shell body is made of steel-lined tetrafluoroethylene, sprayed tetrafluoroethylene or tetrafluoroethylene.

[0008] The shell body includes an upper shell, a flange one and a lower shell, the top of the upper shell is closed and connected to the lower shell through the flange one at the bottom, the top and bottom of the lower shell are open, and the bottom of the lower shell is connected to the falling film evaporator, and the demisting layer is arranged in the upper shell.

[0009] Further, the inner pipe is welded with the outer shell to improve stability and sealing effect.

[0010] Further, the inner pipe comprises an air guide pipe, a flange and an air outlet pipe.

[0011] Further, the air guide pipe is arranged in an L shape, and the upwardly arranged air inlet opening of the air guide pipe and the gas phase buffer chamber can effectively prevent the sub-phosphoric acid from being sucked into the subsequent system due to the material flushing of the falling film evaporator.

[0012] Further, the structured packing is made of ceramic structured packing or four-fluorine material corrugated structured packing.

[0013] Further, the bulk packing is made of a square saddle ring packing or a Pall ring packing.

[0014] Further, the bulk packing is at least two layers and is different from each other, and is continuously distributed between the structured packing and the cyclone plate.

[0015] Further, the cyclone plate is made of four-fluorine material.

[0016] Further, the outer shell further comprises four reinforcing rings, each of which is welded to the upper shell and is located between the structured packing and the bulk packing, between the two layers of bulk packing, between the bulk packing and the cyclone plate, and between the air guide pipe and the gas phase buffer chamber.

[0017] Further, the outer shell further comprises a support plate, which is arranged between the upper shell and the lower shell and supports the bottom of the demisting layer.

[0018] Further, the support plate is a porous structure to facilitate the flow of gas phase.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1. The present application greatly reduces the amount of mist entrainment in the operation process of the sub-phosphoric acid falling film evaporator, effectively solves the problems of poor dehydration and deacidification effect caused by the mist entrainment of the falling film evaporator in the sub-phosphoric acid refining process, and the problem of sub-phosphoric acid material not being easily introduced into the subsequent system caused by the material flushing of the sub-phosphoric acid.

[0021] 2. The upwardly arranged air guide pipe air inlet end opening and the gas phase buffer chamber can effectively avoid the phosphorous acid material being vacuumed to the subsequent system due to the material flushing of the falling film evaporator, and avoid the phosphorous acid material accumulation to cause the blockage of the air outlet pipe.

[0022] 3. The device is in a top-down direct connection structure with the falling film evaporator, so that the demisted liquid can flow into the falling film evaporator, and when local material flushing occurs, the flushed material can flow back to the falling film evaporator in time, thereby avoiding the problems of acid liquid accumulation, material flushing, phosphorous acid material entering the gas-liquid separator, and packing blockage and shutdown. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the internal structure of the present application;

[0024] Figure 2 is a schematic view of the external structure of the present application;

[0025] Figure 3 is a schematic view of the installation position of the reinforcing ring;

[0026] Figure 4 is a schematic view of the installation position of the supporting plate;

[0027] Wherein: 1, the outer shell; 11, the upper shell; 12, the flange one; 13, the lower shell; 14, the reinforcing ring; 15, the supporting plate; 2, the structured packing; 3, the bulk packing; 4, the cyclone plate; 5, the inner pipe; 51, the air guide pipe; 52, the flange two; 53, the air outlet pipe; 6, the gas phase buffer chamber. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The present application is further described with reference to the drawings and the embodiments:

[0029] Referring to the drawings Figure 1 and the drawings Figure 2 , a gas-liquid separator special for phosphorous acid refining falling film evaporator includes an outer shell 1, structured packing 2, bulk packing 3, a cyclone plate 4, an inner pipe 5, and a gas phase buffer chamber 6.

[0030] The outer shell 1 is made of steel lined with Teflon, sprayed Teflon or Teflon, the top of which is closed and arranged, the bottom of which is open and arranged to be connected with the falling film evaporator; the regular packing 2, the bulk packing 3 and the cyclone plate 4 are sequentially arranged from bottom to top along the inside of the outer shell 1, and the regular packing 2, the bulk packing 3 and the cyclone plate 4 form a continuous demisting layer; the inner plug pipeline 5 for discharging gas is arranged on the side of the outer shell 1, the gas inlet end of the inner plug pipeline 5 is above the demisting layer, and the gas phase buffer chamber 6 is formed between the inner plug pipeline 5 and the top of the outer shell 1.

[0031] In the specific implementation process, the gas-liquid separator is connected with the gas phase outlet end of the falling film evaporator, when the gas phase carried by the falling film evaporator gas phase outlet enters the bottom end of the gas-liquid separator, at this time, the gas phase carried by the mist is sequentially through the regular packing 2, the bulk packing and the cyclone plate 4, the gas phase carried by the mist is separated by the three demisting structures, and the liquid droplets are self-flowing into the falling film evaporator through the opening at the bottom end of the gas-liquid separator, the demisted gas phase is buffered and pressure stabilized through the gas phase buffer chamber 6, and then enters the inner plug pipeline 5 through the gas inlet end and is discharged to the outside of the falling film evaporator and enters the subsequent processing system.

[0032] In the embodiment, for the structure of the outer shell 1, referring to the accompanying drawings Figure 1 As shown in the figure, the outer shell 1 comprises an upper shell 11, a flange 12 and a lower shell 13; the upper shell 11 is closed at the top and is connected with the lower shell 13 through the flange 12 at the bottom end, the top end and the bottom end of the lower shell 13 are both open, and the bottom end of the lower shell 13 is used to be connected with the falling film evaporator, and the demisting layer is arranged in the upper shell 11.

[0033] In the embodiment, the inner plug pipeline 5 is consistent with the material of the outer shell 1 and is welded to improve the stability and sealing effect, specifically, for the structure of the inner plug pipeline 5, referring to the accompanying drawings Figure 1 As shown in the figure, the inner plug pipeline 5 comprises a gas guide pipe 51, a flange 52 and a gas outlet pipe 53; the gas guide pipe 51 is arranged on the side of the upper shell 11 and the gas inlet end is above the demisting layer, the gas outlet end of the gas guide pipe 51 extends to the outside of the upper shell 11 and is connected with the gas outlet pipe 53 through the flange 52 to realize the gas discharge; among them, the gas inlet end opening of the gas guide pipe 51 is arranged upward to make the gas guide pipe 51 present L-shaped structure, and the upward arranged gas inlet end opening of the gas guide pipe 51 and the gas phase buffer chamber 6 can effectively avoid that the subphosphoric acid material is vacuumed to the subsequent system caused by the falling material of the falling film evaporator.

[0034] In the embodiment, the regular packing 2 adopts ceramic regular packing or Teflon material corrugated regular packing; the selection and design of this kind of packing increases the effective surface area of the packing, thereby improving the gas-liquid contact efficiency, and reducing the pressure drop by optimizing the fluid path, further improving the operation performance, in addition, the regular arrangement is beneficial to uniform distribution of gas-liquid two-phase fluid, and ensures high efficient mass transfer effect.

[0035] In the embodiment, the bulk packing 3 adopts the matrix saddle ring packing or the Bauer ring packing; the selection of the packing helps to prevent the local plugging problem in the packing layer, increases the effective surface area inside the packing, and improves the distribution of the gas and liquid, and promotes the mass transfer process between the gas and liquid phases; in addition, the bulk packing 3 has at least two layers and is different from each other, and is continuously distributed between the structured packing 2 and the cyclone plate 4, so as to effectively solve the limitations of a single packing, to provide multiple gas-liquid contact opportunities at different heights, thereby significantly improving the mass transfer efficiency, and ensuring that the gas-liquid flow is more balanced on the whole cross section.

[0036] In the embodiment, the cyclone plate 4 is made of a tetrafluoro material.

[0037] In addition, in view of the stability of the overall structure of the gas-liquid separator, for this purpose, with reference to the accompanying drawings, Figure 3 As shown in the drawings, the outer shell 1 further includes four reinforcing rings 14, and each of the reinforcing rings 14 is welded to the upper shell 11 and is located between the structured packing 2 and the bulk packing 3, between the two layers of bulk packing 3, between the bulk packing 3 and the cyclone plate 4, and between the air guide pipe 51 and the gas phase buffer chamber 6.

[0038] In addition, in view of the installation stability of the demisting layer, for this purpose, with reference to the accompanying drawings, Figure 4 As shown in the drawings, the outer shell 1 further includes a support plate 15, and the support plate 15 has one piece and is arranged between the upper shell 11 and the lower shell 13 and is supported at the bottom of the demisting layer, and the support plate 15 is a porous structure to facilitate the flow of the gas phase.

[0039] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid separator special for phosphorous acid refining falling film evaporator, characterized in that: comprising an outer shell (1), structured packing (2), bulk packing (3), cyclone plate (4), internal pipe (5) and gas phase buffer chamber (6); the top of the outer shell (1) is closed, and the bottom is open and used for connecting with the falling film evaporator; the structured packing (2), bulk packing (3) and cyclone plate (4) are sequentially arranged from bottom to top inside the outer shell (1), and the structured packing (2), bulk packing (3) and cyclone plate (4) form a continuous demisting layer; the internal pipe (5) is arranged on the side of the outer shell (1) for discharging gas, the gas inlet end of the internal pipe (5) is above the demisting layer, and the gas phase buffer chamber (6) is formed between the internal pipe (5) and the top of the outer shell (1).

2. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 1, characterized in that: the outer shell (1) comprises an upper shell (11), a flange one (12) and a lower shell (13); the top of the upper shell (11) is closed, and the bottom is connected with the lower shell (13) through the flange one (12); the top and bottom of the lower shell (13) are open, and the bottom of the lower shell (13) is used for connecting with the falling film evaporator; and the demisting layer is arranged in the upper shell (11).

3. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 2, characterized in that: the internal pipe (5) comprises an air inlet pipe (51), a flange two (52) and an air outlet pipe (53); the air inlet pipe (51) is arranged on the side of the upper shell (11) and the gas inlet end is above the demisting layer; the gas outlet end of the air inlet pipe (51) extends to the outside of the upper shell (11) and is connected with the air outlet pipe (53) through the flange two (52).

4. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 3, characterized in that: the gas inlet end of the air inlet pipe (51) is upwardly arranged, so that the air inlet pipe (51) is in L-shaped structure.

5. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 4, characterized in that: the structured packing (2) is ceramic structured packing or four-fluorine material corrugated structured packing.

6. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 5, characterized in that: the bulk packing (3) is square saddle ring packing or bower ring packing.

7. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 6, characterized in that: the bulk packing (3) has at least two layers and is different from each other, and is continuously distributed between the structured packing (2) and the cyclone plate (4).

8. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 7, characterized in that: the outer shell (1) further comprises four reinforcing rings (14), each of which is welded to the upper shell (11) and is between the structured packing (2) and the bulk packing (3), between the two layers of bulk packing (3), between the bulk packing (3) and the cyclone plate (4), and between the air inlet pipe (51) and the gas phase buffer chamber (6). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 8, characterized in that: The outer shell (1) further comprises a support plate (15) which is provided between the upper shell (11) and the lower shell (13) and is supported at the bottom of the demisting layer.

10. The gas-liquid separator special for phosphorous acid refining falling film evaporator according to claim 9, characterized in that: The support plate (15) is a porous structure.

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