Injection water production process and device

Abstract

The invention relates to the technical field of injection water treatment, in particular to an injection water production process and device. According to the production process of the water for injection, the raw water is preheated to the set temperature in a multi-stage preheating mode; raw water is introduced into the vertical evaporator and submerges the evaporation surface of the vertical evaporator so as to generate pure steam; and introducing the pure steam into an outer cavity of an evaporation tube bundle of the vertical evaporator, so that the pure steam is condensed into distilled water while the raw water is heated. When the water for injection is produced, raw water is preheated to a set temperature, then the raw water is introduced into the vertical evaporator and submerges the evaporation surface of the vertical evaporator so as to generate pure steam, and the raw water covers the evaporation surface and is naturally evaporated into the pure steam in a static state instead of being refined into mist by structures such as a nozzle, so that the water for injection is produced. Water drops or fog drops are not prone to being mixed into the pure steam, the purity of the pure steam is high, and the follow-up pure steam treatment difficulty and treatment cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of injection water treatment, in particular to an injection water production process and device. Background Art

[0002] Water for injection is a special type of water that is mainly used in the pharmaceutical and medical fields, especially in the preparation of injections and sterile drugs.

[0003] The quality of water for injection is directly related to the safety and effectiveness of drugs. Water for injection is generally obtained by treating raw water.

[0004] In the existing production process of water for injection, during the treatment of raw water, the raw water needs to be evaporated into pure steam and then condensed into distilled water. During this process, water droplets are easily mixed into the pure steam, thereby affecting the purity of the pure steam and increasing the difficulty and cost of subsequent processing. Summary of the invention

[0005] The purpose of the present invention is to provide a process and device for producing water for injection, so as to solve the problem in the prior art that water droplets are easily mixed into pure steam when treating water for injection.

[0006] In order to solve the above technical problems, the present invention provides a production process and device for water for injection.

[0007] The production process of water for injection of the present invention comprises:

[0008] Preheat the raw water to the set temperature;

[0009] Passing raw water into a vertical evaporator and covering the evaporation surface of the vertical evaporator to generate pure steam;

[0010] Passing the pure steam into the outer cavity of the evaporation tube bundle of the vertical evaporator to condense the pure steam into distilled water while heating the raw water;

[0011] Direct the distilled water into a storage container.

[0012] Furthermore, the pure steam is compressed, and the compressed pure steam is introduced into the outer cavity of the evaporation tube bundle of the vertical evaporator.

[0013] Furthermore, the pure steam is compressed by a compressor.

[0014] Furthermore, the raw water in the vertical evaporator is heated together with the industrial steam and the generated pure steam, and the raw water is preheated in one stage by using the condensed water of the industrial steam flowing out of the vertical evaporator.

[0015] Furthermore, concentrated water in the vertical evaporator is discharged regularly, and the raw water is preheated by using the concentrated water.

[0016] Furthermore, the waste heat of the distilled water is used to preheat the raw water in three stages.

[0017] Furthermore, before the distilled water is guided to the storage container, non-condensable gas in the distilled water is removed, and in the process of removing the non-condensable gas, the raw water is preheated in four stages using the non-condensable gas.

[0018] Furthermore, before the pure steam is introduced into the outer cavity of the tube bundle of the vertical evaporator, the pure steam is demisted.

[0019] Furthermore, a demister is arranged in the vertical evaporator to demist the pure steam.

[0020] The present invention also provides an injection water production device, which is used to implement the injection water production process described in any one of the above technical solutions, including a raw water pipeline, a preheating module, a vertical evaporator, a liquid outlet pipeline and a storage container;

[0021] The preheating module is used to preheat the raw water in the raw water pipeline;

[0022] The vertical evaporator comprises a shell, an evaporation chamber and a condensation chamber are arranged in the shell, an evaporation tube bundle is arranged in the evaporation chamber, the inner wall surface of the evaporation tube bundle forms an evaporation surface, the evaporation chamber is used to contain raw water, the outer cavity of the evaporation tube bundle forms the condensation chamber, the condensation chamber is used to pass pure steam to condense the pure steam into distilled water while heating the raw water; the raw water pipeline is connected with the inner cavity of the vertical evaporator, and the raw water pipeline is used to supply raw water to the evaporation chamber to cover the evaporation surface;

[0023] The liquid outlet pipeline is used to guide the distilled water into a storage container.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] When producing water for injection, the raw water is first preheated to a set temperature, and then the raw water is passed into a vertical evaporator and submerged in the evaporation surface of the vertical evaporator, thereby generating pure steam, and the generated pure steam is passed into the outer cavity of the evaporation tube bundle of the vertical evaporator. The inner wall surface of the evaporation tube bundle forms the evaporation surface. The pure steam in the evaporation tube bundle can heat the raw water submerged in the evaporation surface, and perform heat exchange with the raw water. The pure steam is condensed into distilled water. In this process, since the raw water covers the evaporation surface, it is naturally evaporated into pure steam under static conditions, rather than being refined into mist by structures such as nozzles. Therefore, it is not easy for water droplets or mist droplets to be mixed into the pure steam, and the purity of the pure steam is relatively high, which reduces the difficulty and cost of subsequent processing of the pure steam.

[0026] In addition, the injection water production process of the present invention completes the process of evaporating raw water into pure steam and condensing pure steam into distilled water in a vertical evaporator. The required evaporation equipment has a higher degree of integration and a higher heat exchange efficiency, which avoids heat dissipation caused by the intermediate structure. At the same time, it is also beneficial to save site layout space and achieve higher space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of an embodiment of a process for producing water for injection according to the present invention;

[0028] Figure 2 It is a schematic structural diagram of an embodiment of an injection water production device of the present invention.

[0029] Reference numerals:

[0030] 10. Raw water pipeline; 11. Raw water inlet;

[0031] 20. Vertical evaporator; 21. Demister;

[0032] 30. Liquid outlet pipeline; 31. Distilled water outlet;

[0033] 40. Industrial steam transmission pipeline; 41. Industrial steam inlet; 42. Industrial steam condensate outlet;

[0034] 51. first heat exchanger; 52. second heat exchanger; 53. third heat exchanger; 54. fourth heat exchanger;

[0035] 60. Concentrated water discharge pipeline; 61. Concentrated water outlet;

[0036] 70. Non-condensable gas removal device; 71. Non-condensable gas discharge pipeline; 72. Non-condensable gas outlet;

[0037] 80. Steam compression pipeline; 81. Compressor; 82. Cooling water pipeline; 83. Cooling water inlet; 84. Cooling water outlet. DETAILED DESCRIPTION

[0038] A process and apparatus for producing water for injection of the present invention will be described below in conjunction with a schematic diagram, wherein preferred embodiments of the present invention are shown. It should be understood that those skilled in the art may modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0039] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are in very simplified form and in non-precise proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0042] The following is attached to the instruction manual Figure 1 and 2 , the production process and device of water for injection of the present invention are introduced.

[0043] An embodiment of the first aspect of the present invention provides a process for producing water for injection.

[0044] In one embodiment, if Figure 1 As shown, the injection water production process comprises the following steps:

[0045] S100: preheating the raw water to a set temperature through a multi-stage preheating method;

[0046] S200: passing raw water into the vertical evaporator and covering the evaporation surface of the vertical evaporator to generate pure steam;

[0047] S300: passing the pure steam into the outer cavity of the evaporation tube bundle of the vertical evaporator, so as to condense the pure steam into distilled water while heating the raw water;

[0048] S400: directing the distilled water into a storage container.

[0049] When the injection water production process of the present invention is used to produce injection water, the raw water is first preheated to a set temperature, and then the raw water is passed into the vertical evaporator and does not pass through the evaporation surface of the vertical evaporator, thereby generating pure steam, and the generated pure steam is passed into the outer cavity of the evaporation tube bundle of the vertical evaporator, the inner wall surface of the evaporation tube bundle forms the evaporation surface, and the pure steam outside the evaporation tube bundle can heat the raw water that does not pass through the evaporation surface, and perform heat exchange with the raw water, and the pure steam is condensed into distilled water. In this process, since the raw water covers the evaporation surface, it is naturally evaporated into pure steam under static conditions, rather than being refined into mist by structures such as nozzles. Therefore, it is not easy to mix water droplets or mist droplets into the pure steam, and the purity of the pure steam is high, which reduces the subsequent processing difficulty and processing cost of the pure steam. In addition, the injection water production process of the present invention completes the process of evaporating raw water into pure steam and condensing pure steam into distilled water in the vertical evaporator. The required evaporation equipment has a high degree of integration, a higher heat exchange efficiency, and avoids the heat dissipation caused by the intermediate structure. At the same time, it is also beneficial to save site layout space and have a higher space utilization rate.

[0050] In one embodiment, in order to improve the evaporation efficiency, the pure steam is compressed and the compressed pure steam is passed into the vertical evaporator. Compressing the pure steam can increase the internal energy of the pure steam, so that when the pure steam exchanges heat with the raw water through the evaporation surface, more heat can be transferred to the raw water, which is conducive to improving the evaporation efficiency. Preferably, the pure steam can be compressed by a compressor.

[0051] It should be noted that the vertical evaporator also has an industrial steam pipeline, and the industrial steam in the industrial steam pipeline can also exchange heat with the raw water to heat the raw water to promote the evaporation of the raw water into pure steam. Compressing pure steam can increase the internal energy of pure steam, thereby reducing the demand for industrial steam. Compared with the energy utilization rate when generating industrial steam, the energy utilization rate of the compressor is higher, which is conducive to reducing energy consumption and is also conducive to the condensation of pure steam into distilled water.

[0052] After exchanging heat with raw water, industrial steam will condense into industrial steam condensate water, which also has heat. In order to make full use of its thermal energy, the raw water is preheated by using the industrial steam condensate water condensed from the vertical evaporator.

[0053] As the raw water in the vertical evaporator continues to evaporate, the concentration of impurities in the raw water will continue to increase, and the raw water will gradually become concentrated water. Therefore, in order to avoid the raw water being polluted by the excessive concentration of impurities in the raw water, the concentrated water in the vertical evaporator is discharged regularly, and the discharge cycle can be set according to the water quality index of the concentrated water and specific needs. Since the concentrated water also has a higher temperature and higher thermal energy, in order to fully utilize the thermal energy in the concentrated water, the raw water is preheated by the concentrated water.

[0054] In one embodiment, since the distilled water obtained by condensing pure steam still has a relatively high temperature, in order to fully utilize its internal energy, the residual heat of the distilled water is used to perform a three-stage preheating of the raw water. Specifically, the pipeline for conveying the distilled water and the pipeline for conveying the raw water can be heat-exchanged through a heat exchanger.

[0055] In one of the embodiments, in order to improve the purity of pure steam and remove water droplets or mist droplets that may be contained in pure steam, the pure steam is defogged before passing the pure steam into the outer cavity of the tube bundle of the vertical evaporator. Specifically, a demister can be provided in the vertical evaporator, and the demister is provided at a position close to the outlet of the vertical evaporator. The pure steam can leave the vertical evaporator only after passing through the demister. In this process, water droplets or mist droplets and endotoxins that may be contained in the pure steam are removed by the demister. Since the purity of the pure steam in the injection water production process of the present invention is already relatively high, the water droplets or mist droplets and endotoxins contained in the pure steam are very few, so after passing through the vertical evaporator, the water droplets or mist droplets and endotoxins that may be contained can be more conveniently and fully removed, thereby ensuring that the purity of the pure steam meets the requirements.

[0056] In the process of pure steam condensing into distilled water, gases that cannot condense into water are mixed in. These gases are called non-condensable gases. Non-condensable gases include air, inert gases or other impurity gases. These non-condensable gases may affect the acidity and alkalinity of water or carry microorganisms, resulting in unqualified water for injection. Therefore, it is necessary to remove the non-condensable gases to ensure the purity of the distilled water. In one embodiment, the non-condensable gases in the distilled water are removed before the distilled water is directed to the storage container. Specifically, a non-condensable gas removal device can be used to remove the non-condensable gases.

[0057] In one embodiment, in the process of removing the non-condensable gas, the residual heat of the non-condensable gas is used to perform four-stage preheating on the raw water. In the process of removing the non-condensable gas, it is usually necessary to fully and evenly disperse the distilled water so that the non-condensable gas can escape from the distilled water. The escaped non-condensable gas has a certain temperature. The non-condensable gas is correspondingly exchanged with the raw water through a heat exchanger, which can further heat the raw water, which is beneficial to improve energy utilization and reduce waste heat. Through the four-stage preheating, thermal energy can be fully utilized, waste heat can be reduced, and energy consumption can be reduced. Since the raw water has a higher temperature before entering the vertical evaporator after the four-stage preheating, it can be evaporated into pure steam more quickly after entering the vertical evaporator, which is beneficial to improve the evaporation efficiency of the raw water.

[0058] An embodiment of the second aspect of the present invention provides an injection water production device.

[0059] The injection water production device is used to implement the injection water production process described in any of the above embodiments.

[0060] In one embodiment, if Figure 2 As shown, the injection water production device includes a raw water pipeline 10, a preheating module, a vertical evaporator 20, a liquid outlet pipeline 30 and a storage container.

[0061] The raw water pipeline 10 has a raw water inlet 11 , and raw water enters the raw water pipeline from the raw water inlet 11 . The preheating module is used to preheat the raw water in the raw water pipeline 10 to make it easier for the raw water to evaporate in the vertical evaporator 20 .

[0062] The vertical evaporator 20 includes a shell, in which an evaporation chamber and a condensation chamber are arranged. The evaporation chamber is provided with an evaporation tube bundle, and the inner wall surface of the evaporation tube bundle forms an evaporation surface. The evaporation chamber is used to contain raw water, and the outer cavity of the evaporation tube bundle forms the condensation chamber. The condensation chamber is used to pass pure steam to condense the pure steam into distilled water while heating the raw water. The raw water pipeline 10 is connected to the inner cavity of the vertical evaporator 20, and the raw water pipeline 10 is used to supply raw water to the chamber to cover the evaporation surface. The liquid outlet pipeline 30 is used to guide the distilled water to a storage container.

[0063] When the injection water production device of the present invention is used to produce injection water, the raw water in the raw water pipeline 10 is first preheated to a set temperature by using a preheating module, and then the raw water is introduced into the vertical evaporator 20 and does not pass through the evaporation surface of the vertical evaporator 20, thereby generating pure steam, and the generated pure steam is introduced into the condensation chamber of the vertical evaporator 20. The pure steam outside the evaporation tube bundle can heat the raw water that does not pass through the evaporation surface, and perform heat exchange with the raw water. The pure steam is condensed into distilled water in the condensation chamber. In this process, since the raw water covers the evaporation surface, it is naturally evaporated into pure steam under static conditions, rather than being refined into mist by structures such as nozzles. Therefore, it is not easy for water droplets or mist droplets to be mixed into the pure steam, and the purity of the pure steam is relatively high, which reduces the subsequent processing difficulty and processing cost of the pure steam.

[0064] In one embodiment, in order to provide sufficient heat energy to evaporate the raw water into pure steam, the injection water production device further includes an industrial steam delivery pipeline 40, which is used to introduce industrial steam, thereby providing heat energy for the entire injection water production device. The industrial steam delivery pipeline 40 passes through the evaporation chamber to perform heat exchange with the raw water in the evaporation chamber. Specifically, the industrial steam pipeline has a heat exchange pipe section, which is located in the evaporation chamber, and the other parts of the industrial steam delivery pipeline 40 are respectively connected to the inlet and outlet of the heat exchange pipe section, so that the industrial steam delivery pipeline 40 can pass through the heat exchange pipe section, so that the heat exchange pipe section and the raw water in the evaporation chamber can perform heat exchange. The preheating module includes a first heat exchanger 51. The industrial transmission pipeline and the raw water pipeline 10 perform heat exchange through the first heat exchanger 51 to perform primary preheating of the raw water. The industrial steam will be converted into condensed water after heating. The industrial steam transmission pipeline 40 has an industrial steam inlet 41 and an industrial steam condensate outlet 42. Industrial steam enters from the industrial steam inlet 41, and industrial steam condensate and part of the industrial steam are discharged from the industrial steam condensate outlet 42.

[0065] In order to improve the purity of pure steam and remove the water droplets or mist droplets that may be contained in the pure steam, the pure steam is defogged before passing the pure steam into the vertical evaporator 20. In one embodiment, a demister 21 is provided in the evaporation chamber, and the demister 21 is used to defog the pure steam. The demister 21 is arranged at a position close to the outlet of the evaporation chamber, and the pure steam can leave the evaporation chamber only after passing through the demister 21. In this process, the water droplets or mist droplets and endotoxins that may be contained in the pure steam are removed by the demister 21. Since the purity of the pure steam in the injection water production process of the present invention is already relatively high, the water droplets or mist droplets and endotoxins contained in the pure steam are very few, so after passing through the vertical evaporator 20, the water droplets or mist droplets and endotoxins that may be contained can be more conveniently and fully removed, ensuring that the purity of the pure steam meets the requirements.

[0066] In one embodiment, the injection water production device further includes a concentrated water discharge pipeline 60, which is connected to the evaporation chamber to regularly discharge the concentrated raw water in the evaporation chamber. As the raw water in the evaporation chamber evaporates continuously, the concentration of impurities in the raw water will continue to increase. Therefore, in order to avoid the raw water being polluted by the excessive concentration of impurities in the raw water, a concentrated water discharge pipeline 60 is provided, which is connected to the evaporation chamber, so as to regularly discharge the concentrated raw water in the evaporation chamber. The discharge cycle can be set according to factors such as the water quality index of the concentrated water and specific needs.

[0067] In order to prevent impurities from being deposited at the bottom of the evaporation chamber, preferably, a drain outlet is provided at the bottom of the evaporation chamber, and the concentrated water discharge pipeline 60 has a concentrated water inlet and a concentrated water outlet 61, the concentrated water inlet is connected to the drain outlet, and the concentrated water is finally discharged from the concentrated water outlet 61.

[0068] Furthermore, since the concentrated water has a relatively high temperature and has relatively high thermal energy, in order to fully utilize the thermal energy in the concentrated water, the preheating module also includes a second heat exchanger 52, and the concentrated water discharge pipeline 60 and the raw water pipeline 10 perform heat exchange through the second heat exchanger 52 to perform secondary preheating of the raw water.

[0069] In one embodiment, in order to cool down the condensed distilled water and make full use of the heat energy of the condensed water, the preheating module further includes a third heat exchanger 53, and the liquid outlet pipeline 30 and the raw water pipeline 10 perform heat exchange through the third heat exchanger 53 to perform three-stage preheating of the raw water. The liquid outlet pipeline 30 has a distilled water inlet and a distilled water outlet 31, and the distilled water inlet is connected to the condensation chamber. The distilled water in the condensation chamber enters the liquid outlet pipeline 30 through the distilled water inlet and is discharged from the distilled water outlet 31.

[0070] In the process of pure steam condensing into distilled water, gases that cannot condense into water may be mixed in. These gases are called non-condensable gases. Non-condensable gases include air, inert gases or other impurity gases. These non-condensable gases may affect the acidity and alkalinity of water or carry microorganisms, resulting in unqualified water for injection. Therefore, it is necessary to remove the non-condensable gases to ensure the purity of the distilled water. In one embodiment, the water for injection production device also includes a non-condensable gas removal device 70, and the liquid outlet pipeline 30 flows through the non-condensable gas removal device 70. The non-condensable gas removal device 70 is used to remove non-condensable gases in distilled water.

[0071] Specifically, in order to discharge the non-condensable gas, the injection water production device further includes a non-condensable gas discharge pipeline 71, and a gas outlet is provided at the upper portion of the non-condensable gas removal device 70, and one end of the non-condensable gas discharge pipeline 71 is connected to the gas outlet to discharge the non-condensable gas. The non-condensable gas discharge pipeline 71 has a non-condensable gas inlet and a non-condensable gas outlet 72, and the non-condensable gas inlet is connected to the gas outlet of the non-condensable gas removal device 70, so that the non-condensable gas is discharged from the non-condensable gas outlet 72.

[0072] In order to make full use of the residual heat energy in the non-condensable gas, in one embodiment, the preheating module also includes a fourth heat exchanger 54, and the non-condensable gas exhaust pipeline 71 and the raw water pipeline 10 perform heat exchange through the fourth heat exchanger 54 to perform four-stage preheating of the raw water.

[0073] Preheating the raw water through the four heat exchangers of the preheating module can not only improve the energy utilization rate, but also preheat the raw water to a higher temperature before entering the heat exchanger, so that it can evaporate into pure steam faster after entering the heat exchanger, thereby improving the efficiency of pure steam generation.

[0074] In order to reduce energy consumption and improve energy utilization, in one embodiment, the injection water production device further includes a steam compression pipeline 80 and a compressor 81. The compressor 81 is arranged on the steam compression pipeline 80. The steam compression pipeline 80 has an air inlet end and an air outlet end. The air inlet end is connected to the evaporation chamber, and the air outlet end is connected to the condensation chamber. The steam compression pipeline 80 is used to introduce pure steam in the evaporation chamber into the condensation chamber, and the compressor 81 is used to compress the pure steam in the steam compression pipeline 80. In order to dissipate heat for the compressor 81, the injection water production device further includes a cooling water pipeline 82. The cooling water pipeline 82 has a cooling water inlet 83 and a cooling water outlet 84. The cooling water pipeline 82 is connected to the compressor 81 to cool and dissipate heat for the compressor 81. The cooling water enters from the cooling water inlet 83 and flows out from the cooling water outlet 84 after heat exchange with the compressor 81.

[0075] Compressing pure steam can increase the internal energy of pure steam, so that when pure steam exchanges heat with raw water through the evaporation surface, it can transfer more heat to the raw water, which is beneficial to improving the evaporation efficiency. At the same time, it can also reduce the demand for industrial steam. Compared with the energy utilization rate when generating industrial steam, the energy utilization rate of the compressor 81 is higher, which is beneficial to reducing energy consumption and is also beneficial to condensing pure steam into distilled water.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A process for producing water for injection, characterized in that: include: Preheat the raw water to the set temperature through multi-stage preheating; Passing raw water into a vertical evaporator and covering the evaporation surface of the vertical evaporator to generate pure steam; Passing the pure steam into the outer cavity of the evaporation tube bundle of the vertical evaporator to condense the pure steam into distilled water while heating the raw water; Direct the distilled water into a storage container.

2. The process for producing water for injection according to claim 1, characterized in that: The pure steam is compressed, and the compressed pure steam is introduced into the outer cavity of the evaporation tube bundle of the vertical evaporator.

3. The process for producing water for injection according to claim 2, characterized in that: The pure steam is compressed using a compressor.

4. The process for producing water for injection according to claim 1, characterized in that: The raw water in the vertical evaporator is heated together with the industrial steam and the generated pure steam, and the raw water is preheated in one stage by using the condensed water of the industrial steam flowing out of the vertical evaporator.

5. The process for producing water for injection according to claim 4, characterized in that: The concentrated water in the vertical evaporator is discharged regularly, and the raw water is preheated by the concentrated water.

6. The process for producing water for injection according to claim 5, characterized in that: The raw water is preheated in three stages using the distilled water.

7. The process for producing water for injection according to claim 6, characterized in that: Before the distilled water is guided to the storage container, non-condensable gas in the distilled water is removed, and in the process of removing the non-condensable gas, the raw water is preheated in four stages by using the non-condensable gas.

8. The process for producing water for injection according to claim 1, characterized in that: Before the pure steam is introduced into the outer cavity of the tube bundle of the vertical evaporator, the pure steam is demisted.

9. The process for producing water for injection according to claim 8, characterized in that: A demister is arranged in the vertical evaporator to demist the pure steam.

10. A water for injection production device, characterized in that: A process for producing water for injection according to any one of claims 1 to 9, comprising a raw water pipeline, a preheating module, a vertical evaporator, a liquid outlet pipeline and a storage container; The preheating module is used to preheat the raw water in the raw water pipeline; The vertical evaporator comprises a shell, an evaporation chamber and a condensation chamber are arranged in the shell, an evaporation tube bundle is arranged in the evaporation chamber, the inner wall surface of the evaporation tube bundle forms an evaporation surface, the evaporation chamber is used to contain raw water, the outer cavity of the evaporation tube bundle forms the condensation chamber, the condensation chamber is used to pass pure steam to condense the pure steam into distilled water while heating the raw water; the raw water pipeline is connected with the inner cavity of the vertical evaporator, and the raw water pipeline is used to supply raw water to the evaporation chamber to cover the evaporation surface; The liquid outlet pipeline is used to guide the distilled water into a storage container.

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