Water for injection preparation device

Abstract

The application relates to a water-for-injection preparation device, which comprises a first condenser, a preheating assembly, a first evaporator, an evaporation assembly and a degassing tank. High-temperature steam can heat high-temperature water in the third heat exchange channel during the flow of the high-temperature steam in the fourth heat exchange channel, and the high-temperature steam is condensed. The high-temperature steam which has not been condensed enters the second heat exchange channel of the preheating assembly to exchange heat with the first heat exchange channel, and then enters the degassing tank. After the degassing is completed in the degassing tank, the non-condensable gas is discharged outward through the first waste discharge pipe, and the condensed liquid is introduced into the first liquid inlet of the first condenser and discharged outward through the first liquid outlet. It can be seen that the non-condensable gas is separated through the degassing tank and discharged in time through the first waste discharge pipe, so that the equipment can stably operate, the water quality of the water-for-injection can be ensured, and the problem of poor discharge caused by the condenser cooling negative pressure in the related art can be avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection water preparation, in particular to an injection water preparation device. BACKGROUND

[0002] The production mode of injection water is mainly multi-effect distillation and thermal pressure distillation. The thermal pressure distillation produces injection water by adopting the mechanical steam re-compression mode, and has significant advantages in energy consumption and injection water quality compared with the multi-effect distillation water machine. However, the initial investment of the thermal pressure distillation is too large, so that most of the demand enterprises still mainly use the multi-effect distillation mode for injection water production.

[0003] In the related art, the non-condensable gas removal in the evaporation process of the multi-effect distillation water machine mainly occurs at the first-effect evaporation and the injection water condenser. However, the non-condensable gas removal does not achieve the best effect. During the recooling process of the condenser, the negative pressure condition is prone to occur, which affects the non-condensable gas removal effect, and causes the non-condensable gas to remain in the system, thereby affecting the stable operation of the equipment and the water production quality. SUMMARY

[0004] Therefore, it is necessary to overcome the defects of the prior art, and provide an injection water preparation device which can improve the non-condensable gas removal effect, improve the operation stability of the equipment, and improve the water production quality.

[0005] An injection water preparation device comprises:

[0006] A first condenser is provided with a first feed inlet, a first discharge outlet, a first liquid inlet and a first liquid outlet. The first feed inlet is used for feeding raw water. The first feed inlet is in communication with the first discharge outlet. The first liquid inlet is in communication with the first liquid outlet.

[0007] A preheating assembly is provided with a first heat exchange channel and a second heat exchange channel which exchanges heat with the first heat exchange channel. The first heat exchange channel is in communication with the first discharge outlet. The first heat exchange channel is used for receiving and preheating the raw water discharged from the first discharge outlet.

[0008] A first evaporator is provided with a second feed inlet, a second discharge outlet, an industrial steam inlet, a first condensate discharge port and a first exhaust pipe. The second feed inlet is in communication with the first heat exchange channel. The second feed inlet is in communication with the second discharge outlet. The industrial steam inlet is used for feeding industrial steam. The first condensate discharge port is used for discharging the condensate generated by the condensation of the industrial steam. The bottom of the first evaporator is provided with a first cavity which is in communication with the second discharge outlet. One end of the first exhaust pipe is in communication with the first cavity.

[0009] The evaporation assembly is provided with a third heat exchange channel and a fourth heat exchange channel in heat exchange with the third heat exchange channel, the third heat exchange channel is in communication with the second discharge port, and the third heat exchange channel is used for receiving raw water discharged from the second discharge port; and

[0010] The degassing tank is provided with a first waste discharge pipe, the degassing tank is in communication with the second heat exchange channel, and a liquid discharge port of the degassing tank is in communication with the first liquid inlet.

[0011] In one of the embodiments, the top of the first evaporator is provided with a second chamber in communication with the second feed inlet, and the second feed inlet is provided with a first nozzle inside the second chamber.

[0012] In one of the embodiments, the first waste discharge pipe is provided with a first check valve and a first regulating valve, the top of the first evaporator is further provided with a second waste discharge pipe in communication with the second chamber, and the second waste discharge pipe is provided with a second check valve and a second regulating valve.

[0013] In one of the embodiments, the top of the degassing tank is provided with a second nozzle in communication with the second heat exchange channel.

[0014] In one of the embodiments, the inside of the degassing tank is provided with a filler separation piece.

[0015] In one of the embodiments, the preheating assembly comprises at least two preheaters connected in series, the evaporation assembly comprises at least two second evaporators connected in series, and each second evaporator is correspondingly arranged with each preheater.

[0016] In one of the embodiments, the second evaporator is provided with a third gas inlet in communication with a shell side, a third gas outlet, a first water discharge port, and a second gas discharge pipe in communication with a tube side and located at the bottom of the second evaporator, and the preheater is provided with a fourth gas inlet and a discharge part.

[0017] The first gas discharge pipe is in communication with the third gas inlet of the second evaporator at the head position;

[0018] The third gas outlet of the second evaporator is in communication with the fourth gas inlet of the corresponding preheater, and the discharge part is in communication with the degassing tank.

[0019] For two adjacent second evaporators, the second gas discharge pipe of the former second evaporator is in communication with the third gas inlet of the latter second evaporator.

[0020] The first water discharge port is in communication with the first condenser.

[0021] The second exhaust pipeline of the second evaporator at the end position is communicated with the first condenser.

[0022] In one of the embodiments, the second exhaust pipeline of the second evaporator at the end position is further communicated with the degassing tank through a branch pipeline.

[0023] In one of the embodiments, the second evaporator at the end position is provided with a third exhaust pipeline communicated with the tube passage.

[0024] In one of the embodiments, the water-for-injection preparation device further comprises a second condenser, a cooling medium input pipeline and a cooling medium discharge pipeline, the second condenser is provided with a third feed port, a third discharge port, a second liquid inlet and a second liquid outlet, the third feed port is used for feeding cooling water, the third feed port is communicated with the third discharge port in correspondence, the second liquid inlet is communicated with the first liquid outlet and the second liquid outlet respectively, the cooling medium input pipeline is communicated with the third feed port, and the cooling medium discharge pipeline is communicated with the third discharge port.

[0025] In operation, the raw water is provided by a raw water supply point and enters the first condenser through the first feed port, is preheated during flowing out of the first discharge port and enters the first heat exchange passage correspondingly, is further preheated by the first heat exchange passage, and then enters the first evaporator through the second feed port. Since the industrial steam enters the first evaporator through the industrial steam inlet, the industrial steam exchanges heat with the raw water, so that the industrial steam is condensed to generate condensate water which is discharged outwards through the first condensate water discharge port. The raw water is correspondingly heated to generate high-temperature water including high-temperature steam which enters the first chamber, the high-temperature steam enters the fourth heat exchange passage through the first exhaust pipeline, and the high-temperature water flows into the third heat exchange passage. The high-temperature steam heats the high-temperature water in the third heat exchange passage during flowing in the fourth heat exchange passage, and the high-temperature steam is condensed. The uncondensed high-temperature steam enters the second heat exchange passage of the preheating assembly to exchange heat with the first heat exchange passage, and then enters the degassing tank. After degassing is completed in the degassing tank, the non-condensable gas is discharged outwards through the first exhaust pipeline, and the condensed liquid is fed into the first liquid inlet of the first condenser and discharged outwards through the first liquid outlet. It can be seen that the non-condensable gas is separated by the degassing tank and discharged in time through the first exhaust pipeline, so that the equipment can be stably operated, the water quality of the water-for-injection can be ensured, and the problem of poor discharge caused by the cooling negative pressure of the condenser in the related art can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a water-for-injection preparation device according to an embodiment of the present application.

[0027] 10, first condenser; 20, preheating assembly; 21, preheater; 22, connecting pipe; 30, first evaporator; 31, first chamber; 32, second exhaust pipe; 321, second one-way valve; 322, second regulating valve; 33, first condensate discharge pipe; 331, trap; 34, second chamber; 35, first nozzle; 36, first exhaust pipe; 40, evaporation assembly; 41, second evaporator; 411, second exhaust pipe; 412, branch pipe; 413, third exhaust pipe; 414, liquid delivery pipe; 50, degassing tank; 51, first exhaust pipe; 511, first one-way valve; 512, first regulating valve; 52, second nozzle; 53, packing separator; 60, second condenser; 61, water for injection discharge pipe; 70, cooling medium input pipe; 80, cooling medium discharge pipe. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and with modifications thereof, without departing from the scope of the present application, and it is understood that these embodiments are given for the purposes of illustration only.

[0029] Reference Figure 1 , Figure 1The structure diagram of the water for injection preparation device is shown. The water for injection preparation device comprises a first condenser 10, a preheating assembly 20, a first evaporator 30, an evaporation assembly 40 and a degassing tank 50. The first condenser 10 is provided with a first feeding port, a first discharging port, a first liquid inlet and a first liquid outlet (not shown in the figure). The first feeding port is used for feeding raw water, and the first feeding port is in communication with the first discharging port. The first liquid inlet is in communication with the first liquid outlet. The preheating assembly 20 is provided with a first heat exchange channel and a second heat exchange channel in heat exchange with the first heat exchange channel. Optionally, the first heat exchange channel is, for example, the tube side of the preheating assembly 20, and the second heat exchange channel is correspondingly the shell side of the preheating assembly 20, or vice versa. The first heat exchange channel is in communication with the first discharging port, and the first heat exchange channel is used for receiving the raw water discharged from the first discharging port and preheating the raw water. The first evaporator 30 is provided with a second feeding port, a second discharging port, an industrial steam inlet, a first condensate discharge port and a first exhaust pipe 36. The second feeding port is in communication with the first heat exchange channel, and the second feeding port is also in communication with the second discharging port. The industrial steam inlet is used for feeding industrial steam, and the first condensate discharge port is used for discharging the condensate generated by the condensation of the industrial steam. The bottom of the first evaporator 30 is provided with a first cavity 31 in communication with the second discharging port. One end of the first exhaust pipe 36 is in communication with the first cavity 31. The evaporation assembly 40 is provided with a third heat exchange channel and a fourth heat exchange channel in heat exchange with the third heat exchange channel. Optionally, the third heat exchange channel is, for example, the tube side of the evaporation assembly, and the fourth heat exchange channel is correspondingly the shell side of the evaporation assembly. The third heat exchange channel is in communication with the second discharging port, and the third heat exchange channel is used for receiving the raw water discharged from the second discharging port. The fourth heat exchange channel is in communication with the other end of the first exhaust pipe 36 and the second heat exchange channel, respectively. The degassing tank 50 is provided with a first exhaust pipe 51, the degassing tank 50 is in communication with the second heat exchange channel, and the liquid outlet of the degassing tank 50 is in communication with the first liquid inlet.

[0030] The water for injection preparation device described above, in operation, raw water is provided, for example, by a raw water supply point (such as A shown in Figure 1 The raw water enters the first condenser 10 through the first feeding port, is preheated during the process of flowing out of the first discharging port, and enters the first heat exchange channel correspondingly, is further preheated by the first heat exchange channel, and then the preheated raw water enters the first evaporator 30 through the second feeding port. At the same time, due to the industrial steam supply point (such as Figure 1The industrial steam (indicated by C in the figure) enters the first evaporator 30 through the industrial steam inlet, exchanges heat with the raw water, and condenses to generate condensed water which is discharged through the first condensed water discharge port. The raw water is heated to generate high-temperature water containing high-temperature steam which enters the first chamber 31. The high-temperature steam enters the fourth heat exchange channel through the first exhaust pipe 36, and the high-temperature water enters the third heat exchange channel. The high-temperature steam in the fourth heat exchange channel heats the high-temperature water in the third heat exchange channel, and at the same time, the high-temperature steam condenses. The uncondensed high-temperature steam exchanges heat with the first heat exchange channel in the second heat exchange channel of the preheating assembly 20, and then enters the degassing tank 50. After degassing is completed in the degassing tank 50, the non-condensable gas is discharged through the first exhaust pipe 51, and the condensed liquid is introduced into the first inlet of the first condenser 10 and discharged through the first outlet. It can be seen that the non-condensable gas is separated by the degassing tank 50 and discharged in time through the first exhaust pipe 51, so that the equipment can operate stably, the water quality of the injection water can be ensured, and the problem of poor discharge caused by condenser cooling negative pressure in the related art can be avoided.

[0031] Please refer to Figure 1 In an embodiment, the first exhaust pipe 51 is provided with a first check valve 511 and a first regulating valve 512. In this way, the first check valve 511 allows the gas to flow to the non-condensable gas discharge port in one direction and prevents the gas from flowing into the degassing tank 50 in the opposite direction.

[0032] Optionally, the first regulating valve 512 includes but is not limited to a needle valve or other types of regulating valves.

[0033] Please refer to Figure 1 In an embodiment, the top of the first evaporator 30 is provided with a second chamber 34 which communicates with the second inlet. The second inlet is provided with a first nozzle 35 which is located inside the second chamber 34. In this way, the raw water treated by the preheating assembly 20 is sprayed into the second chamber 34 through the first nozzle 35, so that atomization effect can be achieved.

[0034] Please refer to Figure 1 In an embodiment, the top of the first evaporator 30 is further provided with a second exhaust pipe 32 which communicates with the second chamber 34. The second exhaust pipe 32 is provided with a second check valve 321 and a second regulating valve 322. In this way, the non-condensable gas in the second chamber 34 flows to the non-condensable gas discharge port in one direction through the second exhaust pipe 32, and the flow rate can be adjusted, so that the non-condensable gas is prevented from flowing back to the second chamber 34. That is, the discharge is performed before the first evaporation, which can help to ensure the water quality of the injection water.

[0035] Specifically, the first exhaust pipe 51 and the second exhaust pipe 32 are connected in parallel and are both connected to a non-condensable gas discharge point (indicated as D3 in the figure), so that the non-condensable gas is discharged to the non-condensable gas discharge point.

[0036] Referring to Figure 1 In an embodiment, the top of the degassing tank 50 is provided with a second nozzle 52. The second nozzle 52 is in communication with the second heat exchange channel. In this way, the condensation end of the second heat exchange channel removes the non-condensable gas in an efficient manner by combining atomization and degassing.

[0037] Referring to Figure 1 In an embodiment, the inside of the degassing tank 50 is provided with a filler separation piece 53. In this way, the filler separation piece 53 can effectively remove the gas mixed in the high-temperature distilled water. Optionally, the filler separation piece 53 includes, but is not limited to, a Baur ring provided with a preset thickness. The specific size of the preset thickness can be flexibly adjusted and set according to actual needs, which is not limited here.

[0038] Specifically, the filler separation piece 53 is arranged below the second nozzle 52.

[0039] Referring to Figure 1 Optionally, the first condensate discharge port is connected to a condensate discharge point (indicated as D4 in the figure) through a first condensate discharge pipe 33. In addition, a drain valve 331 is arranged on the first condensate discharge pipe 33, which is beneficial to realize the condensation of steam to obtain condensate and timely discharge to the condensate discharge point. Figure 1

[0040] Referring to Figure 1 In an embodiment, the preheating assembly 20 includes at least two preheaters 21 connected in series. The evaporation assembly 40 includes at least two second evaporators 41 connected in series. Each second evaporator 41 is arranged corresponding to each preheater 21. In this way, the high-temperature steam that is not condensed in each second evaporator 41 can enter the inside of the corresponding preheater 21 to preheat the raw water in the preheater 21, which plays a role in reasonably utilizing energy and avoiding energy waste.

[0041] Referring to Figure 1 ​In one embodiment, the second evaporator 41 is provided with a third gas inlet, a third gas outlet, a first drainage (not shown in the figure) which are in communication with the shell side of the second evaporator 41, and a second exhaust pipeline 411 which is in communication with the tube side of the second evaporator 41 and is located at the bottom of the second evaporator 41. The preheater 21 is provided with a fourth gas inlet and a discharge part (not shown in the figure). The first exhaust pipeline 36 is in communication with the third gas inlet of the second evaporator 41 at the head position. The third gas outlet of the second evaporator 41 is in communication with the fourth gas inlet of the corresponding preheater 21, and the discharge part is in communication with the degassing tank 50 through the connecting pipe 22. For two adjacent second evaporators 41, the second exhaust pipeline 411 of the former second evaporator 41 is in communication with the third gas inlet of the latter second evaporator 41. The first drainage is in communication with the first condenser 10. The second exhaust pipeline 411 of the second evaporator 41 at the tail position is in communication with the first condenser 10. In this way, the high-temperature steam entering the inside of the preheater 21 exchanges heat with the raw water in the preheater 21 to condense, and the condensed water carrying high-temperature steam and non-condensable gas generated is introduced into the degassing tank 50 through the discharge part and the connecting pipe 22, subjected to atomization treatment, and combined with aeration at the bottom of the degassing tank 50 to be subjected to degassing treatment, thereby efficiently removing the non-condensable gas entrained in the condensed water (also known as injection water) in the preheater 21, and the degassed condensed water (also known as injection water) is introduced into the first condenser 10. In addition, the high-temperature steam exchanges heat with the distilled water in the tube side and the shell side of the second evaporator 41 after entering the inside of the shell side of the second evaporator 41, and condensed water is generated at the first drainage and is sent to the first condenser 10 through the liquid conveying pipe 414. In addition, the second exhaust pipeline 411 of the second evaporator 41 at the tail position delivers high-temperature steam to the first condenser 10, which is condensed by the first condenser 10 and then outputted outward.

[0042] It should be noted that the second evaporator 41 at the head position refers to the second evaporator 41 arranged in the first position according to the flow direction of the raw water.

[0043] It should be noted that the second evaporator 41 at the tail position refers to the second evaporator 41 arranged in the first position according to the flow direction of the raw water.

[0044] Please refer to Figure 1 In one embodiment, the second exhaust pipeline 411 of the second evaporator 41 at the tail position is also in communication with the degassing tank 50 through the branch pipe 412. In this way, part of the gas in the secondary steam not evaporated in the tail position and / or other columns is introduced into the degassing tank 50 as a degassing source, thereby enhancing the degassing effect and being more continuous than the condenser removal mode without aggregation area. The amount of gas introduced into the degassing tank 50 can be flexibly adjusted and set according to actual needs, which is not limited herein.

[0045] Please refer to Figure 1In one embodiment, the second evaporator 41 at the end position is provided with a third waste water discharge pipe 413 in communication with the tube path. In this way, the third waste water discharge pipe 413 can discharge the concentrated water of the second evaporator 41 to a concentrated water discharge point (such as D5 shown in Figure 1 ).

[0046] Please refer to Figure 1 In one embodiment, the water for injection preparation device further comprises a second condenser 60, a cooling medium input pipe 70 and a cooling medium discharge pipe 80. The second condenser 60 is provided with a third feed port for feeding cooling water, a third discharge port in communication with the third feed port, a second liquid inlet in communication with the first liquid outlet and the second liquid outlet, the cooling medium input pipe 70 is in communication with the third feed port, and the cooling medium discharge pipe 80 is in communication with the third discharge port.

[0047] Optionally, the second liquid outlet is provided with a water for injection discharge pipe 61. The water for injection discharge pipe 61 is connected to a water for injection supply point (such as D1 shown in Figure 1 ).

[0048] Specifically, the cooling medium, for example, cold water, enters the cooling medium input pipe 70 as shown in B of Figure 1 , exchanges heat with the distilled water discharged from the first condenser 10 into the second condenser 60, so that the temperature of the distilled water is reduced and then discharged outward through the second liquid outlet; wherein the second liquid outlet is provided with a second condensed water discharge pipe, and the second liquid outlet is connected to a condensed water discharge point (such as D2 shown in ​ ) through the second condensed water discharge pipe.

[0049] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or identifying the number of the indicated technical characteristics. Thus, a feature with the "first", "second" limitation can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0051] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0053] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0054] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present application.

[0055] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An apparatus for preparing water for injection, characterized in that, The water-for-injection preparation apparatus includes: The first condenser is provided with a first feed inlet, a first discharge outlet, a first liquid inlet and a first liquid outlet. The first feed inlet is used to introduce raw material water. The first feed inlet is connected to the first discharge outlet and the first liquid inlet is connected to the first liquid outlet. The preheating component is provided with a first heat exchange channel and a second heat exchange channel that exchanges heat with the first heat exchange channel. The first heat exchange channel is connected to the first discharge port and is used to receive the raw material water discharged from the first discharge port and preheat it. The first evaporator is provided with a second feed inlet, a second discharge outlet, an industrial steam inlet, a first condensate discharge outlet, and a first exhaust pipe. The second feed inlet is connected to the first heat exchange channel, and the second feed inlet is correspondingly connected to the second discharge outlet. The industrial steam inlet is used to introduce industrial steam, and the first condensate discharge outlet is used to discharge the condensate generated by the condensation of industrial steam. The bottom of the first evaporator is provided with a first chamber connected to the second discharge outlet, and one end of the first exhaust pipe is connected to the first chamber. An evaporation assembly, comprising a third heat exchange channel and a fourth heat exchange channel exchanging heat with the third heat exchange channel; the third heat exchange channel is connected to a second discharge port and is used to receive raw material water discharged from the second discharge port; the fourth heat exchange channel is connected to the other end of the first exhaust pipe and the second heat exchange channel, respectively; and A degassing tank is provided with a first waste discharge pipe. The degassing tank is connected to the second heat exchange channel. The liquid outlet of the degassing tank is connected to the first liquid inlet. The interior of the degassing tank is provided with a packing separator. The preheating assembly includes at least two preheaters connected in series; the evaporation assembly includes at least two second evaporators connected in series; each second evaporator is configured corresponding to each of the preheaters. The second evaporator is provided with a third air inlet, a third air outlet, a first drain outlet, and a second exhaust pipe that communicates with the shell side and is located at the bottom of the second evaporator; the preheater is provided with a fourth air inlet and an exhaust section. The first exhaust pipe is connected to the third air inlet of the second evaporator at the head position; The third air outlet of the second evaporator is connected to the fourth air inlet of the corresponding preheater, and the discharge section is connected to the degassing tank; For two adjacent second evaporators, the second exhaust pipe of the first second evaporator is connected to the third air inlet of the second second evaporator; The first drain outlet is connected to the first condenser; The second exhaust pipe of the second evaporator at the end position is connected to the first condenser.

2. The apparatus for preparing water for injection according to claim 1, characterized in that, The top of the first evaporator is provided with a second chamber that communicates with the second feed inlet. A first nozzle is provided at the second feed inlet and is located inside the second chamber.

3. The apparatus for preparing water for injection according to claim 2, characterized in that, The first waste discharge pipe is equipped with a first check valve and a first regulating valve.

4. The apparatus for preparing water for injection according to claim 3, characterized in that, The top of the first evaporator is also provided with a second waste pipe that communicates with the second chamber.

5. The apparatus for preparing water for injection according to claim 4, characterized in that, The second waste discharge pipe is equipped with a second check valve and a second regulating valve.

6. The apparatus for preparing water for injection according to claim 4, characterized in that, The first waste discharge pipe and the second waste discharge pipe are connected in parallel and are both connected to the non-condensable gas emission point.

7. The apparatus for preparing water for injection according to claim 1, characterized in that, The top of the degassing tank is provided with a second nozzle, which is connected to the second heat exchange channel.

8. The apparatus for preparing water for injection according to claim 1, characterized in that, The second exhaust pipe of the second evaporator at the end position is also connected to the degassing tank via a branch pipe.

9. The apparatus for preparing water for injection according to claim 1, characterized in that, The second evaporator at the end position is equipped with a third waste pipe that communicates with the tube side.

10. The apparatus for preparing water for injection according to any one of claims 1 to 9, characterized in that, The water-to-injection preparation apparatus further includes a second condenser, a cooling medium inlet pipe, and a cooling medium outlet pipe. The second condenser is provided with a third feed port, a third discharge port, a second liquid inlet, and a second liquid outlet. The third feed port is used to introduce cooling water, and the third feed port is connected to the third discharge port. The second liquid inlet is connected to the first liquid outlet and the second liquid outlet, respectively. The cooling medium inlet pipe is connected to the third feed port, and the cooling medium outlet pipe is connected to the third discharge port.

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