Vacuumizing system

Abstract

The utility model provides a vacuumizing system and relates to the technical field of cyclic carbonate production equipment. The vacuumizing system comprises a reaction kettle, a spray tower and a liquid ring vacuum pump, the reaction kettle is communicated with the spray tower through a first gas phase pipeline, and the spray tower is communicated with the liquid ring vacuum pump through a second gas phase pipeline; the liquid ring vacuum pump comprises a pump head and a working liquid storage tank, a liquid outlet pipeline and a liquid return pipeline are arranged on the working liquid storage tank, the working liquid storage tank comprises a water accumulation area and a working liquid area, an inlet of the pump head is communicated with the working liquid area through the liquid outlet pipeline, and an outlet of the pump head is communicated with the working liquid area through the liquid return pipeline. And an outlet of the pump head is communicated with the water accumulation area through the liquid return pipeline. The vacuumizing efficiency of the vacuum pump can be reduced, and the function of the vacuum pump is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to annular carbonate production equipment technical field, specifically, relate to a vacuum system. BACKGROUND

[0002] In the process of preparing annular carbonate by urea method, the gas in the reaction kettle needs to be discharged, usually using a vacuum pump to suck the gas. However, since the main component of the gas is ammonia, also including carbon dioxide, water and organic matter, etc., the gas directly entering the dry vacuum pump is easy to produce carbon ammonium crystal, which will block the vacuum pump pipeline, causing the vacuum pump to stop.

[0003] In production, a liquid ring vacuum pump is often used to suck the gas, and since the gas contains ammonia, water and carbon dioxide, etc., the working liquid of the liquid ring vacuum pump has requirements. First, the working liquid cannot be mutually soluble with water or ammonia; second, the boiling point of the working liquid cannot be too low, otherwise the working liquid will vaporize; the freezing point of the working liquid cannot be too high, otherwise the working liquid will solidify; third, the density of the working liquid is smaller than that of water. However, after the liquid ring vacuum pump sucks for a long time, the water in the gas will remain in the liquid ring vacuum pump, and when the water becomes more and more, the ammonia gas will dissolve in the water, making it difficult for the vacuum pump to reach the required vacuum degree, affecting the gas discharge. SUMMARY

[0004] The utility model discloses a kind of vacuum systems, which can slow down the efficiency of vacuum pump vacuumizing, facilitate the water discharge in vacuum pump, ensure the function of vacuum pump.

[0005] The utility model discloses the following technical scheme realizes:

[0006] A vacuum system, comprising a reaction kettle, a spray tower and a liquid ring vacuum pump, the reaction kettle and the spray tower are communicated by a first gas phase pipeline, the spray tower is communicated with the liquid ring vacuum pump by a second gas phase pipeline;The liquid ring vacuum pump includes pump head and working liquid storage tank, the working liquid storage tank is provided with liquid outlet pipeline and liquid return pipeline, the working liquid storage tank includes water accumulation area and working liquid area, the inlet of the pump head is communicated with the working liquid area by the liquid outlet pipeline, the outlet of the pump head is communicated with the water accumulation area by the liquid return pipeline, the bottom of the water accumulation area is provided with guide liquid pipeline.

[0007] Further, the working liquid storage tank is provided with a baffle, the baffle divides the working liquid storage tank to form water accumulation area and working liquid area distributed on the left and right, and the water accumulation area is communicated with the upper part of the working liquid area.

[0008] Further, the working liquid storage tank includes working liquid area at upper part and water accumulation area at lower part.

[0009] Further, the liquid outlet pipeline is provided with a working liquid pump.

[0010] Further, the bottom of the water accumulation area is provided with a water guide pipeline, and the water guide pipeline is provided with a water guide valve.

[0011] Further, the gas phase outlet of the liquid ring vacuum pump is connected with a third gas phase pipeline, and the third gas phase pipeline is provided with a gas storage tank.

[0012] Further, the upper part of the spray tower is connected with a washing liquid inlet pipeline, and the bottom of the spray tower is connected with a solution outlet pipeline.

[0013] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0014] In the vacuumizing process, the spray tower is used to wash the sucked gas first, and the carbon dioxide in the gas phase is washed away. During the washing and eluting process, a large amount of ammonia and water exist in the gas, the ammonia enters the liquid ring vacuum pump through the second gas phase pipeline, and the ammonia still contains water at this time. Since the working liquid in the liquid ring vacuum pump is not soluble with water or ammonia, when the gas enters the liquid ring vacuum pump, the water in the gas will remain in the working liquid, forming a layered solution with the working liquid on the top and water on the bottom. The water gradually accumulates in the water accumulation area, the working liquid enters the working liquid area through overflow, the water in the water accumulation area is drained through water guide, which helps to improve the gas discharge effect, facilitates the recycling of ammonia, prevents the water in the liquid ring vacuum pump from accumulating more and more, and avoids the situation that the liquid ring vacuum pump is difficult to reach the required vacuum degree. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The structure diagram of the vacuumizing system provided for the embodiment 1 of the utility model is shown in the figure.

[0017] Figure 2 The structure diagram of the liquid ring vacuum pump provided for the embodiment 1 of the utility model is shown in the figure.

[0018] Figure 3 Another structure diagram of the liquid ring vacuum pump provided for the embodiment 1 of the utility model is shown in the figure.

[0019] Icon: 1-reactor, 2-spray tower, 3-liquid ring vacuum pump, 4-first gas phase pipeline, 5-second gas phase pipeline, 6-third gas phase pipeline, 7-gas storage tank, 8-washing liquid inlet pipeline, 9-solution outlet pipeline, 31-pump head, 32-working liquid storage tank, 33-liquid outlet pipeline, 34-liquid return pipeline, 35-working liquid pump, 321-baffle, 322-accumulation area, 323-working liquid area, 324-guiding pipeline, 325-guiding valve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of 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 some 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 can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0022] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0024] In the description of the utility model, still need explaining, unless another explicit provision and limitation, if appearing term " setting " " installation " " link " " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, can understand the above-mentioned term in the utility model specific meaning according to specific circumstances.

[0025] Embodiment 1

[0026] As Figure 1 The utility model provides a kind of vacuum system, including reaction kettle 1, spray tower 2 and liquid ring vacuum pump 3, the reaction kettle 1 and the spray tower 2 are communicated by first gas phase pipeline 4, the spray tower 2 is communicated with the liquid ring vacuum pump 3 by second gas phase pipeline 5;The liquid ring vacuum pump 3 includes pump head 31 and working liquid storage tank 32, working liquid storage tank 32 is provided with liquid outlet line 33 and liquid return line 34, working liquid storage tank 32 includes water accumulation area 322 and working liquid area 323, the inlet of pump head 31 is communicated with working liquid area 323 by the liquid outlet line 33, the outlet of pump head 31 is communicated with water accumulation area 322 by the liquid return line 34.

[0027] In the process of vacuumizing, first, spray tower 2 is used to wash the gas sucked, washes carbon dioxide in gas phase.During elution process, since there is a large amount of ammonia in gas, ammonia enters into liquid ring vacuum pump 3 by second gas phase pipeline 5, ammonia still contains water at this time.Since working liquid in liquid ring vacuum pump 3 and water or ammonia are not mutually soluble, when gas enters into liquid ring vacuum pump 3, water in gas will remain in working liquid, forms a layer for working liquid, a layer for water layered solution, water gradually gathers in water accumulation area 322, working liquid enters into working liquid area 323 by overflow, water in water accumulation area 322 is drained, it is helpful to improve gas discharge effect, while it is convenient to recycle ammonia, can prevent water in liquid ring vacuum pump 3 from more and more, avoid the situation that liquid ring vacuum pump 3 is difficult to reach the vacuum degree required.

[0028] As Figure 2As shown in the embodiment, the working fluid storage tank 32 is provided with a baffle 321 in the embodiment, the baffle 321 divides the working fluid storage tank 32 into left and right distributed water accumulation area 322 and working fluid area 323, and the water accumulation area 322 is communicated with the upper part of the working fluid area 323. Wherein, the working fluid is not miscible with water or ammonia, the density of the working fluid is less than the density of water, and after mixing with water, a layered solution is formed, in which the upper layer is working fluid and the lower layer is water. The gas-liquid mixture enters the water accumulation area 322 of the working fluid storage tank 32 from the reflux pipeline 34 by using the baffle 321, the working fluid enters the working fluid area 323 on the other side from the water accumulation area 322 by using overflow, and then the working fluid in the working fluid area 323 is transported to the pump head 31 through the liquid outlet pipeline 33, so as to realize the recycling of the working fluid.

[0029] As shown in the embodiment, Figure 3 As shown in another embodiment of the present embodiment, the working fluid storage tank 32 includes an upper working fluid area 323 and a lower water accumulation area 322. The density of the working fluid is less than the density of water, and after mixing with water, a layered solution is formed, in which the upper layer is working fluid and the lower layer is water. At this time, the liquid outlet pipeline 33 is communicated with the working fluid area 323 of the working fluid storage tank 32, and the working fluid is transported to the pump head 31 by side sampling. Wherein, the dashed line represents the boundary line between water and working fluid at a certain time.

[0030] In the present embodiment, the working fluid pump 35 is arranged on the liquid outlet pipeline 33. The working fluid pump 35 pumps the working fluid to the pump head 31, so as to lubricate, cool and form a liquid ring vacuum sealing system for the pump head 31.

[0031] In the present embodiment, the bottom of the water accumulation area 322 is provided with a guide pipeline 324, and the guide valve 325 is arranged on the guide pipeline 324. The guide valve 325 is convenient for discharging water according to the use time of the liquid ring vacuum pump 3.

[0032] In the present embodiment, the gas phase outlet of the liquid ring vacuum pump 3 is connected with a third gas phase pipeline 6, and the gas storage tank 7 is arranged on the third gas phase pipeline 6. The third gas phase pipeline 6 and the gas storage tank 7 cooperate to recycle the washed ammonia gas.

[0033] In the present embodiment, the spray tower 2 is connected with a washing liquid inlet pipeline 8 at the upper part, and is connected with a solution outlet pipeline 9 at the bottom. Wherein, the first gas phase pipeline 4 is connected with the lower part of the spray tower 2. Through the gas-liquid reverse mass transfer, the carbon dioxide in the ammonia gas is washed out, so as to prevent the carbon dioxide and ammonia gas from producing ammonium carbonate crystals in the pipeline to cause pipeline blockage, and the purity of the recycled ammonia gas can be improved. The ammonium carbonate aqueous solution formed after washing is discharged from the solution outlet pipeline 9 for collection and recycling.

[0034] The working principle of the vacuum system is that the gas in the reaction kettle 1 enters from the lower part of the spray tower 2 through the first gas phase pipeline 4, the washing liquid enters from the upper part of the spray tower 2 through the washing liquid inlet pipeline 8, the gas is washed and eluted by the washing liquid, the carbon dioxide in the gas is washed away, then the ammonia gas is sucked to the liquid ring vacuum pump 3 through the second gas phase pipeline 5, and then enters the gas storage tank 7 through the third gas phase pipeline 6 to be stored and collected.

[0035] When the liquid ring vacuum pump 3 works, the working liquid pump 35 delivers the working liquid to the pump head 31 through the liquid outlet pipeline 33, the working liquid and the gas form a gas-liquid mixture at the pump head 31, the gas-liquid mixture enters the water accumulation area 322 of the working liquid storage tank 32 through the liquid return pipeline 34, water gradually accumulates at the bottom of the water accumulation area 322, the working liquid overflows to the working liquid area 323, and the gas phase is discharged from the outlet of the liquid ring vacuum pump 3; after being used for a period of time, the liquid guide valve 325 is opened, and the accumulated water is discharged from the liquid guide pipeline 324.

[0036] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A vacuum pumping system, characterized by: The application relates to a liquid ring vacuum pump, which comprises a reaction kettle, a spray tower and a liquid ring vacuum pump, the reaction kettle and the spray tower are communicated through a first gas phase pipeline, the spray tower is communicated with the liquid ring vacuum pump through a second gas phase pipeline; the liquid ring vacuum pump comprises a pump head and a working liquid storage tank, the working liquid storage tank is provided with a liquid outlet pipeline and a liquid return pipeline, the working liquid storage tank comprises a water accumulation area and a working liquid area, the inlet of the pump head is communicated with the working liquid area through the liquid outlet pipeline, and the outlet of the pump head is communicated with the water accumulation area through the liquid return pipeline.

2. The evacuation system of claim 1, wherein, The working liquid storage tank is provided with a baffle, the baffle divides the working liquid storage tank into the water accumulation area and the working liquid area which are distributed on the left and right sides, and the water accumulation area is communicated with the upper part of the working liquid area.

3. The evacuation system of claim 1, wherein, The working liquid storage tank comprises the working liquid area at the upper part and the water accumulation area at the lower part.

4. A vacuum system according to claim 2 or 3, c h a r a c t e r i s e d in that The liquid outlet pipeline is provided with a working liquid pump.

5. The evacuation system of claim 4, wherein, The bottom of the water accumulation area is provided with a liquid guide pipeline, and the liquid guide pipeline is provided with a liquid guide valve.

6. The evacuation system of claim 1, wherein, The gas phase outlet of the liquid ring vacuum pump is connected with a third gas phase pipeline, and the third gas phase pipeline is provided with a gas storage tank.

7. The evacuation system of claim 1, wherein, The upper part of the spray tower is connected with a washing liquid inlet pipeline, and the bottom of the spray tower is connected with a solution outlet pipeline.

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