Distillation tower of novel multi-effect water distiller

Abstract

The utility model relates to the technical field of distillation towers, and discloses a distillation tower of a novel multi-effect water distiller, which comprises a tower body consisting of an upper evaporator and a lower separator. The upper evaporator comprises an upper shell, a raw material water inlet formed in the top of the upper shell, tube plates installed on the upper side and the lower side in the upper shell, a plurality of heat exchange tubes vertically installed on the two tube plates, a steam inlet and a non-condensable gas outlet, wherein the steam inlet and the non-condensable gas outlet are formed in the two sides of the upper shell respectively. And the lower separator is communicated with the bottom of the upper evaporator. Through the arrangement of the plurality of heat exchange tubes, raw material water enters the upper shell through the raw material water inlet and then exchanges heat with steam, so that rapid falling film evaporation is realized along the walls of the heat exchange tubes, non-condensable gas generated by the shell pass of the distillation tower is gradually accumulated to the top of the shell pass of the distillation tower and is discharged through the non-condensable gas outlet, and the non-condensable gas is continuously discharged, so that the non-condensable gas is continuously discharged. The heat exchange coefficient is improved to the maximum extent, and the heat exchange efficiency of the evaporator is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation columns, in particular to a distillation column of a new type of multi-effect distilled water machine. Background Art

[0002] The preparation of drugs cannot do without water. Injection water is very important process water for drug production and is a key factor in ensuring the quality of drugs in the production of drugs such as injections, freeze-dried powder injections, and eye drops. The Chinese Pharmacopoeia stipulates that "distillation method should be adopted to obtain injection water". The distillation method is the most effective method to remove bacterial endotoxins and has a good removal effect on impurities such as non-volatile organic compounds, inorganic substances, including suspended solids, colloids, bacteria, viruses, and heat sources in raw water. Therefore, the distillation method is widely used in the world to produce injection water.

[0003] The multi-effect distilled water machine is a key equipment in pharmaceutical production, and its main function is to continuously and stably "purify" raw water by distillation into "injection water" that meets the requirements of the pharmacopoeia.

[0004] The core component of the multi-effect distilled water machine is the distillation column. A multi-effect distilled water machine is composed of 4 to 7 distillation columns connected in series and in parallel.

[0005] The inventor found that the existing distillation column has insufficient processing capacity for non-condensable gases, resulting in a greater impact on the evaporation efficiency. Content of the Utility Model

[0006] The purpose of the utility model is to solve the problems existing in the prior art, and to provide a distillation column of a new type of multi-effect distilled water machine.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A distillation column of a new type of multi-effect distilled water machine, including a tower body, the tower body is composed of an upper evaporator and a lower separator;

[0009] The upper evaporator includes an upper shell, a raw water inlet arranged at the top of the upper shell, tube plates installed on the upper and lower sides inside the upper shell, a number of heat exchange tubes vertically installed on the two tube plates, and a steam inlet and a non-condensable gas discharge port respectively arranged on both sides of the upper shell;

[0010] The lower separator is communicated with the bottom of the upper evaporator.

[0011] Preferably, a steam condensate outlet is arranged below the side of the upper shell.

[0012] Preferably, the lower separator includes a lower shell connected and installed to the bottom of the upper shell, a spiral separator disposed inside the lower shell, and a collector installed on the inner wall of the lower shell and forming a cavity with the inner wall of the lower shell. The collector is located outside the spiral separator. The inner wall of the collector is provided with collection holes. An outlet for secondary pure steam is provided above the outside of the lower shell, and a condensate outlet communicating with the cavity is provided below the outside of the lower shell.

[0013] Preferably, a sight glass is provided below the side of the lower shell.

[0014] Preferably, a water outlet is provided at the bottom of the lower shell.

[0015] Preferably, the upper shell and the lower shell are detachably connected by a flange.

[0016] Preferably, a cover body is detachably installed on the top of the upper shell through a flange. The raw water inlet is provided on the cover body, and both ends of the heat exchange tube are respectively communicated with the inner cavity of the cover body and the inner cavity of the lower shell.

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

[0018] In the present utility model, after the raw water enters the interior of the upper shell through the raw water inlet, through heat exchange with the steam, rapid falling film evaporation is achieved along the heat exchange tube wall. The non-condensable gas generated in the shell side of the distillation column gradually accumulates at the top of the shell side of the distillation column and is discharged through the non-condensable gas discharge port. Due to the continuous discharge of the non-condensable gas, the heat transfer coefficient is maximally improved, and the heat exchange efficiency of the evaporator is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a distillation column of a novel multi-effect distilled water machine proposed by the present utility model.

[0020] In the figure: 1, upper shell; 2, raw water inlet; 3, tube sheet; 4, heat exchange tube; 5, steam inlet; 6, non-condensable gas discharge port; 7, steam condensate outlet; 8, lower shell; 9, spiral separator; 10, collector; 11, collection hole; 12, secondary pure steam outlet; 13, condensate outlet; 14, sight glass; 15, water outlet; 16, cover body; 17, cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0022] Refer to Figure 1, a distillation column of a new type of multi-effect distiller, comprising a column body, the column body being composed of an upper evaporator and a lower separator;

[0023] The upper evaporator includes an upper housing 1, a raw water inlet 2 provided at the top of the upper housing 1, tube sheets 3 installed on the upper and lower sides inside the upper housing 1, a number of heat exchange tubes 4 vertically installed on the two tube sheets 3, and a steam inlet 5 and a non-condensable gas discharge port 6 respectively provided on both sides of the upper housing 1;

[0024] The lower separator is communicated with the bottom of the upper evaporator.

[0025] When this distillation column is in use, after the raw water enters the inside of the upper housing 1 through the raw water inlet 2, it is rapidly evaporated into gaseous secondary pure steam along the wall of the heat exchange tube 4 by heat exchange with the steam. The non-condensable gas generated in the shell side of the distillation column gradually accumulates at the top of the shell side of the distillation column and is discharged through the non-condensable gas discharge port 6. Due to the continuous exclusion of the non-condensable gas, the heat transfer coefficient is maximally improved, and the heat exchange efficiency of the evaporator is greatly improved. Its K value can be as high as 3000 W·m -2 ·°C -1 .

[0026] In this embodiment, a steam condensate outlet 7 is provided below the side of the upper housing 1, and a water outlet 15 is provided at the bottom of the lower housing 8. The lower separator includes a lower housing 8 connected and installed to the bottom of the upper housing 1, a spiral separator 9 arranged inside the lower housing 8, and a collector 10 installed on the inner wall of the lower housing 8 and forming a cavity 17 with the inner wall of the lower housing 8. The collector 10 is located outside the spiral separator 9. A collection hole 11 is formed in the inner wall of the collector 10. A secondary pure steam outlet 12 is provided above the outside of the lower housing 8, and a condensate outlet 13 communicating with the cavity 17 is provided below the outside of the lower housing 8. The secondary pure steam generated by the evaporation of the distillation column (i.e., generated by the heat exchange of the raw water) and the water vapor mixture of the unevaporated raw water enter the lower part of the distillation column through the diversion of the separator inner liner. Under the action of gravity, the unevaporated liquid water flows into the bottom of the separator and is finally discharged through the water outlet 15 to enter the next distillation column for continuous evaporation. The secondary pure steam rises and enters the spiral plate of the spiral separator 9. There are four groups of spiral plates, which are wound around the outside of the separator inner liner. The secondary pure steam entraining water vapor droplets is forced to rotate under the action of the spiral plate, and the tangential velocity of the generated airflow can reach 30 m / s. The generated high-speed centrifugal force throws the mist droplets entrained in the pure steam onto the wall of the collector 10. Finally, it is introduced into the steam condensate collector 10 through the upper notch (i.e., the collection port) of the wall of the collector 10. The droplets containing impurities such as bacterial endotoxins are excluded, and finally discharged through the condensate outlet 13. The clean pure steam after vapor-liquid separation enters the shell side of the next-effect distillation column as heating steam through the secondary pure steam outlet, and at the same time condenses into distilled water (injection water) itself. By adopting the above design, the spiral centrifugal separation continuously discharges condensate, effectively reducing the bacterial endotoxin and non-condensable gas content of the injection water by 10 to 100 orders of magnitude, thereby obtaining injection water with extremely high quality.

[0027] In this embodiment, a sight glass 14 is provided below the side of the lower housing 8.

[0028] In this embodiment, the upper housing 1 and the lower housing 8 are detachably connected by a flange.

[0029] In this embodiment, a cover body 16 is detachably installed on the top of the upper housing 1 through a flange. The raw water inlet 2 is arranged on the cover body 16. Both ends of the heat exchange tube 4 communicate with the inner cavity of the cover body 16 and the inner cavity of the lower housing 8 respectively.

[0030] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A distillation column of a new type of multi-effect distiller, comprising a column body, characterized in that: The tower body is composed of an upper evaporator and a lower separator; The upper evaporator includes an upper shell, a raw water inlet arranged at the top of the upper shell, tube sheets installed on the upper and lower sides inside the upper shell, a number of heat exchange tubes vertically installed on the two tube sheets, and a steam inlet and a non-condensable gas discharge port respectively arranged on both sides of the upper shell; The lower separator is communicated with the bottom of the upper evaporator.

2. The distillation column of a novel multi-effect distilled water machine according to claim 1, characterized in that: A steam condensate outlet is arranged below the side of the upper shell.

3. The distillation column of a novel multi-effect distilled water machine according to claim 1, characterized in that: The lower separator includes a lower shell connected and installed with the bottom of the upper shell, a spiral separator arranged inside the lower shell, and a collector installed on the inner wall of the lower shell and forming a cavity with the inner wall of the lower shell. The collector is located outside the spiral separator. Collection holes are formed in the inner wall of the collector. A secondary pure steam outlet is arranged above the outside of the lower shell, and a condensate water outlet communicated with the cavity is arranged below the outside of the lower shell.

4. The distillation column of a novel multi-effect distiller according to claim 3, characterized in that: A sight glass is arranged below the side of the lower shell.

5. The distillation column of a new type of multi-effect distiller according to claim 4, characterized in that: A water outlet is arranged at the bottom of the lower shell.

6. The distillation column of a novel multi-effect distiller according to claim 3, characterized in that: The upper shell and the lower shell are detachably connected by a flange.

7. The distillation column of a novel multi-effect distiller according to claim 3, characterized in that: A cover body is detachably installed on the top of the upper shell through a flange. The raw water inlet is arranged on the cover body. The two ends of the heat exchange tube are respectively communicated with the inner cavity of the cover body and the inner cavity of the lower shell.

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