Device for removing sodium sulfate crystals

Abstract

The utility model provides a device for removing sodium sulfate crystals, and belongs to the technical field of chemical production. The device is used in a crude phenol refining system, and the crude phenol refining system comprises a dehydrating tower and a reboiler connected with the dehydrating tower. The buffer storage tank is connected with the bottom of the reboiler through a pressure equalizing pipeline, and a pressure equalizing valve is arranged on the pressure equalizing pipeline; the nitrogen pressurizing device is connected with the buffer storage tank through a pressurizing pipeline and is used for filling nitrogen into the buffer storage tank through the pressurizing pipeline; the emptying groove is connected with the bottom of the buffer storage tank through an emptying pipeline, and an emptying valve is arranged on the emptying pipeline. The device can realize on-line washing of sodium sulfate crystals in the crude phenol dehydrating tower, and avoids frequent starting and stopping of the dehydrating tower.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and particularly relates to a device for removing sodium sulfate crystals. Background Art

[0002] Coking crude phenol contains sodium sulfate water. During the dehydration process of crude phenol refining, due to the evaporation of water, sodium sulfate will precipitate to form sodium sulfate crystals adhering to the surfaces of equipment such as the trays and bottom reboiler of the dehydration tower, causing the tower pressure to rise and affecting the separation operation of the distillation tower. In actual production, it is necessary to regularly wash and dissolve the sodium sulfate crystals in the dehydration tower with water, and the wastewater containing sodium sulfate is emptied into the wastewater emptying tank. The crude phenol dehydration tower operates under negative pressure. When the materials in the tower are emptied, it is necessary to stop vacuum pumping and pressurize with nitrogen to atmospheric pressure. After emptying, vacuum pumping is carried out again for normal production. This process takes 6 - 8 hours and the operation is cumbersome, affecting the stable operation of production. Summary of the Utility Model

[0003] In view of the above problems existing in the prior art, the purpose of the embodiment of the present utility model is to provide a device for removing sodium sulfate crystals. This device can realize online flushing of sodium sulfate crystals in the crude phenol dehydration tower, avoiding frequent startup and shutdown of the dehydration tower.

[0004] The technical solution adopted in the embodiment of the present utility model is as follows:

[0005] A device for removing sodium sulfate crystals, which is used in a crude phenol refining system. The crude phenol refining system includes a dehydration tower and a reboiler connected to the dehydration tower. The device includes;

[0006] A buffer storage tank, which is connected to the bottom of the reboiler through a pressure equalizing pipeline, and a pressure equalizing valve is provided on the pressure equalizing pipeline;

[0007] A nitrogen pressurizing device, which is connected to the buffer storage tank through a pressurizing pipeline, and is used to inject nitrogen into the buffer storage tank through the pressurizing pipeline;

[0008] An emptying tank, which is connected to the bottom of the buffer storage tank through an emptying pipeline, and an emptying valve is provided on the emptying pipeline.

[0009] Further, the device further includes a nitrogen guiding distributor, which is arranged in the buffer storage tank and connected to the pressurizing pipeline. The nitrogen guiding distributor is used to blow the nitrogen in the pressurizing pipeline into the buffer storage tank along the tangential direction of the inner wall of the buffer storage tank.

[0010] Further, the nitrogen guiding distributor is of a pipe body structure and is vertically arranged. The nitrogen guiding distributor is provided with a plurality of guiding holes at intervals in the vertical direction, and the axial direction of the guiding holes is consistent with the tangential direction of the inner wall of the buffer storage tank.

[0011] Furthermore, there are multiple nitrogen gas guiding distributors, and the multiple nitrogen gas guiding distributors are arranged at intervals along the circumferential direction of the buffer storage tank.

[0012] Furthermore, the nitrogen gas guiding distributors are fixed on the inner wall of the buffer storage tank.

[0013] Furthermore, the bottom of the buffer storage tank is in a funnel shape.

[0014] Furthermore, a transparent glass sight glass is provided on the vent pipeline.

[0015] Furthermore, a pressure display meter is provided on the pressurization pipeline.

[0016] Furthermore, a first valve, a second valve and a detection pipeline located between the first valve and the second valve are provided on the pressurization pipeline. One end of the detection pipeline is connected to the pressurization pipeline, and the other end is suspended. A drain valve is provided on the detection pipeline.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows:

[0018] The device for removing sodium sulfate crystals of the present invention adds a buffer storage tank. By opening and closing the pressure equalizing valve, positive and negative pressure conversion and balance can be achieved, so that the sodium sulfate solution in the dehydration tower and the reboiler can be smoothly emptied, reducing the start-stop operation of the vacuum pump. And through the nitrogen gas pressurization device, the materials in the buffer storage tank are discharged into the vent tank, reducing the operation time for flushing the sodium sulfate crystals in the coking crude phenol dehydration tower, and realizing the on-line flushing of the sodium sulfate crystals in the coking crude phenol dehydration tower, avoiding frequent start-up and shutdown of the dehydration tower.

[0019] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory and are not intended to limit the present invention.

[0020] The summary of various implementations or examples of the technologies described in the present invention is not a full disclosure of the entire scope of the disclosed technologies or all features. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The drawings generally illustrate various embodiments by way of example and not limitation, and are used in conjunction with the specification and the claims to explain the embodiments of the present invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts.

[0022] Figure 1 It is a schematic structural diagram of a device for removing sodium sulfate crystals according to an embodiment of the present invention;

[0023] Figure 2 This is the front view of the buffer storage tank in the embodiment of the present utility model.

[0024] Figure 3 This is the top view of the buffer storage tank in the embodiment of the present utility model.

[0025] In the figure: 1, dehydration tower; 2, reboiler; 3, buffer storage tank; 4, pressure equalizing valve; 5, vent valve; 6, pressure display meter; 7, transparent glass sight glass; 8, nitrogen pressurizing device; 9, vent tank; 10, first valve; 11, second valve; 12, detection pipeline; 13, drain valve; 14, nitrogen guiding distributor; 15, guiding hole. Specific embodiments

[0026] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model pertains. The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute positions of the objects being described change, the relative positional relationships may also change accordingly. In order to keep the following description of the embodiments of the present utility model clear and concise, the detailed descriptions of known functions and known components are omitted in the present utility model.

[0028] The embodiment of the present utility model provides a device for removing sodium sulfate crystals, which is used in a crude phenol refining system. Among them, the crude phenol refining system includes a dehydration tower 1 and a reboiler 2 connected to the dehydration tower 1.

[0029] As Figure 1 shown, the device for removing sodium sulfate crystals in this embodiment mainly includes a buffer storage tank 3, a nitrogen pressurizing device 8 and a vent tank 9.

[0030] The buffer storage tank 3 is connected to the bottom of the reboiler 2 through a pressure equalizing pipeline. A pressure equalizing valve 4 is provided on the pressure equalizing pipeline, and the opening and closing of the pressure equalizing pipeline can be controlled through the pressure equalizing valve 4.

[0031] The nitrogen pressurizing device 8 is connected to the buffer storage tank 3 through a pressurizing pipeline, and is used to inject nitrogen into the buffer storage tank 3 through the pressurizing pipeline, so as to quickly discharge the materials in the buffer storage tank 3 into the venting tank 9 by using the pressure of nitrogen, thereby reducing the venting time.

[0032] The venting tank 9 is connected to the bottom of the buffer storage tank 3 through a venting pipeline. A venting valve 5 is provided on the venting pipeline.

[0033] When the operation of flushing and dissolving sodium sulfate in the dehydration tower 1 requires venting the materials in the tower, the pressure equalizing valve 4 on the equalizing pipeline is opened under the condition of not stopping the vacuum pumping of the dehydration tower 1, so as to achieve the pressure balance between the dehydration tower 1 and the buffer storage tank 3, and enable the materials in the tower to flow into the buffer storage tank 3 through the reboiler 2. Then the pressure equalizing valve 4 is closed, the venting valve 5 is opened, and at the same time the nitrogen pressurizing device 8 is opened, and the materials in the buffer storage tank 3 are vented into the venting tank 9 through the venting pipeline.

[0034] The device for removing sodium sulfate crystals in this embodiment adds a buffer storage tank 3. By opening and closing the pressure equalizing valve 4, the positive and negative pressure conversion balance can be achieved, which can smoothly vent the sodium sulfate solution in the dehydration tower 1 and the reboiler 2, reduce the start-stop operation of the vacuum pump, and discharge the materials in the buffer storage tank 3 into the venting tank 9 through the nitrogen pressurizing device 8, reduce the operation time of flushing the sodium sulfate crystals in the coking crude phenol dehydration tower 1, and realize the on-line flushing of the sodium sulfate crystals in the coking crude phenol dehydration tower 1, avoiding the frequent start-up and shutdown of the dehydration tower 1.

[0035] As Figure 2 and Figure 3 shown, in some embodiments, the device further includes a nitrogen guiding distributor 14, and the nitrogen guiding distributor 14 is arranged in the buffer storage tank 3 and connected to the pressurizing pipeline.

[0036] The nitrogen guiding distributor 14 is used to blow the nitrogen in the pressurizing pipeline into the buffer storage tank 3 along the tangential direction of the inner wall of the buffer storage tank 3, which can play a stirring role and effectively prevent the sodium sulfate crystals from adhering to the inner wall of the buffer tank.

[0037] The number of the nitrogen guiding distributors 14 is not specifically limited, and it can be determined according to the inner diameter of the buffer storage tank 3. A plurality of nitrogen guiding distributors 14 can be arranged at intervals along the circumferential direction of the inner wall of the buffer storage tank 3, so as to increase the cleaning area.

[0038] In some embodiments, the nitrogen gas guiding distributor 14 is a pipe structure and is vertically arranged. A plurality of guiding holes 15 are spacedly arranged in the vertical direction of the nitrogen gas guiding distributor 14. The nitrogen gas generated by the nitrogen gas pressurizing device 8 enters the nitrogen gas guiding distributor 14 through the pressurizing pipeline and then is discharged through the guiding holes 15 thereon.

[0039] Preferably, the axial direction of the guiding hole 15 is consistent with the tangential direction of the inner wall of the buffer storage tank 3, so as to ensure that the nitrogen gas blows down the materials adhering to the buffer storage tank 3.

[0040] As for the number of the guiding holes 15, no specific limitation is made, and it can be determined according to the length of the pipe structure.

[0041] Furthermore, in some embodiments, the nitrogen gas guiding distributor 14 can be directly fixed on the inner wall of the buffer storage tank 3. For example, it is fixed on the inner wall of the buffer storage tank 3 through a corresponding bracket structure or the like. The nitrogen gas guiding distributor 14 has a connection section extending into the buffer storage tank 3 for connecting the pressurizing pipeline.

[0042] In some embodiments, the top of the buffer storage tank 3 is connected to the uniform pipeline, and the bottom of the buffer storage tank 3 is in a funnel shape or a cone shape, so as to facilitate the complete discharge of the materials in the buffer storage tank 3.

[0043] In some embodiments, a transparent glass sight glass 7 is further provided on the vent pipeline. The operator can observe the venting situation through the transparent glass sight glass 7 to judge whether the venting is complete. It is also possible to observe whether there are sodium sulfate crystals in the vented materials through the transparent glass sight glass 7 to judge the flushing and dissolving effect of the sodium sulfate crystals.

[0044] In some embodiments, a pressure display meter 6 is provided on the pressurizing pipeline. The operator can observe the pressure situation on the pressurizing pipeline through the pressure display meter 6, so as to avoid over-pressurizing the equipment caused by excessive nitrogen gas supplementation.

[0045] In some embodiments, a first valve 10, a second valve 11 and a detection pipeline 12 located between the first valve 10 and the second valve 11 are provided on the pressurizing pipeline. The first valve 10 is close to the buffer storage tank 2, and the second valve 11 is close to the nitrogen gas pressurizing device 8. One end of the detection pipeline 12 is connected to the pressurizing pipeline, and the other end is suspended. A drain valve 13 is provided on the detection pipeline 12.

[0046] It should be noted that the drain valve 13 can be selected from the same valves as the pressure equalizing valve 4 or the vent valve 5.

[0047] The drain valve 13 of this embodiment is in an open state at all times. After the nitrogen charging device 8 has completed charging the buffer storage tank 3, the first valve 10 and the second valve 11 can be closed respectively. By observing whether there is material discharge in the detection pipeline 12, it can be determined which valve has a problem. For example, if it is detected that nitrogen is being discharged, it can be further detected whether the second valve 11 has a problem; if it is detected that the material in the buffer storage tank 3 is being discharged, it can be further detected whether the first valve 10 has a problem, thereby preventing the material from flowing back into the nitrogen charging device 8.

[0048] The above description is intended to be illustrative and not restrictive. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of their solutions) can be used in combination with each other, and it is contemplated that these embodiments can be combined with each other in various combinations or permutations.

Claims

1. An apparatus for removing sodium sulfate crystals, which is used in a crude phenol refining system. The crude phenol refining system includes a dehydration tower and a reboiler connected to the dehydration tower, and is characterized in that, The device includes; A buffer storage tank, which is connected to the bottom of the reboiler through a pressure equalizing pipeline, and a pressure equalizing valve is provided on the pressure equalizing pipeline; A nitrogen pressurizing device, which is connected to the buffer storage tank through a pressurizing pipeline and is used to inject nitrogen into the buffer storage tank through the pressurizing pipeline; A vent tank, which is connected to the bottom of the buffer storage tank through a vent pipeline, and a vent valve is provided on the vent pipeline.

2. The device for removing sodium sulfate crystals according to claim 1, characterized in that, The device further includes a nitrogen guiding distributor, which is arranged in the buffer storage tank and connected to the pressurizing pipeline, and the nitrogen guiding distributor is used to blow the nitrogen in the pressurizing pipeline into the buffer storage tank along the tangential direction of the inner wall of the buffer storage tank.

3. The device for removing sodium sulfate crystals according to claim 2, characterized in that, The nitrogen guiding distributor is of a pipe body structure and is vertically arranged. A plurality of guiding holes are arranged at intervals in the vertical direction of the nitrogen guiding distributor, and the axial direction of the guiding holes is consistent with the tangential direction of the inner wall of the buffer storage tank.

4. The device for removing sodium sulfate crystals according to claim 3, wherein, There are a plurality of the nitrogen guiding distributors, and the plurality of nitrogen guiding distributors are arranged at intervals along the circumferential direction of the buffer storage tank.

5. The device for removing sodium sulfate crystals according to claim 2, characterized in that, The nitrogen guiding distributor is fixed on the inner wall of the buffer storage tank.

6. The device for removing sodium sulfate crystals according to claim 1, characterized in that, The bottom of the buffer storage tank is funnel-shaped.

7. The device for removing sodium sulfate crystals according to claim 1, characterized in that, A transparent glass sight glass is provided on the vent pipeline.

8. The device for removing sodium sulfate crystals according to claim 1, wherein, A pressure display meter is provided on the pressurizing pipeline.

9. The device for removing sodium sulfate crystals according to claim 1, characterized in that, A first valve, a second valve and a detection pipeline located between the first valve and the second valve are provided on the pressurizing pipeline. One end of the detection pipeline is connected to the pressurizing pipeline, and the other end is suspended. A drain valve is provided on the detection pipeline.

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