Injection water preparation system

Abstract

The invention discloses an injection water preparation system, and relates to the technical field of medical water, the injection water preparation system comprises a first heat exchanger, a first non-condensable gas separator, an evaporator and a second non-condensable gas separator, the evaporator is communicated with a water inlet pipeline and a water outlet pipeline; the evaporator is used for evaporating and condensing raw material water introduced through the water inlet pipeline to form injection water and discharging the injection water through the water outlet pipeline, a tube pass of the first heat exchanger is communicated with the water inlet pipeline, a shell pass inlet of the first heat exchanger is communicated with a factory waste heat pipeline, and a shell pass outlet of the first heat exchanger is communicated with the discharging pipeline. The first heat exchanger is used for preheating raw material water, the first non-condensable gas separator is arranged on the water inlet pipeline, the second non-condensable gas separator is arranged on the water outlet pipeline, and a non-condensable gas outlet of the evaporator communicates with the second non-condensable gas separator. The double non-condensable gas discharging systems are used for discharging non-condensable gas in the water for injection, so that the water quality of the water for injection is improved.

Description

Technical Field

[0001] This invention relates to the field of medical water technology, and in particular to a system for preparing water for injection. Background Technology

[0002] Water for injection is used in drug manufacturing processes and the preparation of pharmaceutical formulations, and has a significant impact on the quality of sterile drugs. There are two preparation processes: distillation and non-distillation. Distillation is the preferred method for preparing water for injection, and commonly used equipment includes multi-effect distillers and autoclave distillers. Autoclave distillers have lower energy consumption, saving approximately 50% more energy than multi-effect distillers. Autoclave distillers are available in vertical and horizontal models, using an electric motor to perform secondary compression of steam, increasing its temperature and pressure before evaporating the raw water to prepare water for injection.

[0003] Most existing hot-pressed distilled water preparation methods use horizontal steam spraying, which uses industrial steam as a heat source to heat the raw water. After heating, the raw water becomes high-purity steam, which is then drawn into a compressor. The compressor performs work on the high-purity steam, converting electrical energy into heat energy, thereby increasing the pressure and enthalpy of the pure steam. The high-pressure, high-purity steam is then transported to a steam generator through the compressor outlet. The high-purity steam then enters a shell-and-tube countercurrent heat exchanger, where it transfers its heat to the purified water and condenses into condensate, which is the required injection water.

[0004] However, the following drawbacks have been found in the use of existing technologies: 1. Existing technologies concentrate the discharge of non-condensable gases from water injection after the production of water injection, resulting in incomplete discharge of non-condensable gases; 2. Existing technologies use U-shaped tubes directly inserted into the evaporator for auxiliary heating, and the welding of U-shaped tubes poses a risk of leakage, leading to industrial steam contamination of purified water.

[0005] Therefore, how to provide a water-for-injection preparation system that at least partially solves the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a water for injection preparation system that employs a dual non-condensable gas emission system. Non-condensable gas emission devices are installed in both the raw water preheating stage and the pure steam condensation stage to remove non-condensable gases from the water for injection and improve the water quality.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A water-to-injection preparation system includes: a first heat exchanger, a first non-condensable gas separator, an evaporator, and a second non-condensable gas separator. The evaporator is connected to an inlet pipe and an outlet pipe. The evaporator is used to evaporate and condense the raw water introduced through the inlet pipe to form water for injection and to discharge the water for injection through the outlet pipe. The tube side of the first heat exchanger is connected to the inlet pipe, the shell side inlet of the first heat exchanger is connected to a waste heat pipe in the factory, and the shell side outlet of the first heat exchanger is connected to a discharge pipe. The first heat exchanger is used to preheat the raw water. The first non-condensable gas separator is located in the inlet pipe, the second non-condensable gas separator is located in the outlet pipe, and the non-condensable gas outlet of the evaporator is connected to the second non-condensable gas separator.

[0009] In one possible implementation, a second heat exchanger is also included, wherein the tube side of the second heat exchanger is connected to the inlet water pipe and is located downstream of the first heat exchanger, the shell side inlet of the second heat exchanger is connected to the concentrate outlet of the evaporator, and the shell side outlet of the second heat exchanger is connected to the discharge pipe.

[0010] In one possible implementation, a third heat exchanger is also included. The tube side of the third heat exchanger is connected to the inlet pipe and is located downstream of the second heat exchanger. The shell side inlet of the second heat exchanger is connected to the non-condensable gas outlet, and the shell side outlet of the second heat exchanger is connected to the second non-condensable gas separator and the discharge pipe, respectively.

[0011] In one possible implementation, a fourth heat exchanger and a fifth heat exchanger are also included, both of which have their tube sides connected to the inlet water pipe. The fourth heat exchanger is located between the third heat exchanger and the evaporator, and the fifth heat exchanger is located between the first heat exchanger and the second heat exchanger. The shell-side inlet of the fourth heat exchanger is connected to the industrial steam inlet, the shell-side outlet of the fourth heat exchanger is connected to the shell-side inlet of the fifth heat exchanger, the shell-side outlet of the fifth heat exchanger is connected to the discharge pipe, and the industrial steam discharge port of the evaporator is connected to the shell-side inlet of the fifth heat exchanger.

[0012] In one possible implementation, a sixth heat exchanger is also included, the tube side of which is connected to the outlet pipe, and the shell side of which is connected to the inlet pipe between the second and third heat exchangers.

[0013] In one possible implementation, a first non-condensable gas separator is disposed between a third heat exchanger and a fourth heat exchanger, and a first circulating pump is disposed between the first non-condensable gas separator and the fourth heat exchanger. A drain pipe is disposed between the first circulating pump and the fourth heat exchanger, and the drain pipe is connected to a discharge pipe. A first valve body is disposed on the drain pipe.

[0014] In one possible implementation, a second non-condensable gas separator is disposed between a sixth heat exchanger and an evaporator, and a second circulation pump is provided between the sixth heat exchanger and the second non-condensable gas separator.

[0015] In one possible implementation, a shut-off pipe is connected between the shell-side inlet and shell-side outlet of the sixth heat exchanger, and a second valve body is provided on the shut-off pipe for controlling its connection or closure.

[0016] In one possible implementation, a tenth valve body is provided between the industrial steam inlet and the shell-side inlet of the fourth heat exchanger, and an eleventh valve body is provided between the industrial steam inlet and the industrial steam inlet of the evaporator.

[0017] In one possible implementation, a sampling port is provided on the outlet pipe downstream of the sixth heat exchanger.

[0018] Compared with the above-mentioned background technology, the water for injection preparation system provided by the present invention has the following beneficial effects:

[0019] This invention incorporates two non-condensable gas emission devices—a first non-condensable gas separator and a second non-condensable gas separator—into the water-to-injection preparation system. These devices release non-condensable gases generated during the preheating of the raw water in the inlet pipe and during the evaporation and condensation process after the raw water enters the evaporator. In other words, the first and second non-condensable gas separators are respectively located on the inlet and outlet pipes. This arrangement ensures the release of non-condensable gases during both the preheating and evaporation / condensation stages, thereby eliminating non-condensable gases from the water for injection and improving its quality.

[0020] Furthermore, the heat exchanger in this invention uses waste heat from the factory, which is generated by the factory and contains heat in the form of gas, liquid, or gas-liquid mixture. By preheating the raw water with waste heat from the factory, the heat energy required for the evaporator to evaporate and condense the raw water can be reduced. In this way, the energy consumed by the entire preparation system can be reduced. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the water-for-injection preparation system provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the evaporator structure provided in an embodiment of the present invention.

[0024] in:

[0025] 1-First heat exchanger, 2-First non-condensable gas separator, 3-Evaporator, 4-Second non-condensable gas separator, 5-Inlet water pipe, 6-Outlet water pipe, 7-Factory waste heat pipe, 8-Discharge pipe, 9-Second heat exchanger, 10-Third heat exchanger, 11-Fourth heat exchanger, 12-Fifth heat exchanger, 13-Industrial steam inlet, 14-Sixth heat exchanger, 15-First circulating pump, 16-Water discharge pipe, 17-First valve body, 18-Second circulating pump, 19-Stop pipe, 20-Second valve body, 21-Tenth valve body, 22-Industrial steam inlet, 23-Eleventh valve body, 24-Industrial steam discharge port, 25-Sampling port, 26-Third valve body, 27-Fourth valve body, 28-Jacket, 29-Pressure booster pipe, 30-Compressor, 31-Fifth valve body, 32-Sixth valve body, 33-Seventh valve body, 34-Eighth valve body, 35-Ninth valve body. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0029] The purpose of this invention is to provide a water for injection preparation system that employs a dual non-condensable gas emission system. Non-condensable gas emission devices are installed in both the raw water preheating stage and the pure steam condensation stage to remove non-condensable gases from the water for injection and improve the water quality.

[0030] It should be noted that the instruction manual includes... Figure 1 The solid line represents the flow path of the liquid, the dashed line represents the flow path of the gas, and the direction of the arrow indicates the flow direction of the liquid or gas; A represents waste heat from the plant, B represents raw water, C represents the discharge port, D represents qualified injection water, and E represents plant steam.

[0031] To achieve the above objectives, the present invention provides the following technical solution:

[0032] Please see Figure 1 and Figure 2 This embodiment provides a water for injection preparation system, including: a first heat exchanger 1, a first non-condensable gas separator 2, an evaporator 3, and a second non-condensable gas separator 4. The evaporator 3 is connected to an inlet pipe 5 and an outlet pipe 6. The evaporator 3 is used to evaporate and condense the raw water introduced through the inlet pipe 5 to form water for injection and discharge the water for injection through the outlet pipe 6. The tube side of the first heat exchanger 1 is connected to the inlet pipe 5, the shell side inlet of the first heat exchanger 1 is connected to the waste heat pipe 7 of the factory, and the shell side outlet of the first heat exchanger 1 is connected to the discharge pipe 8. The first heat exchanger 1 is used to preheat the raw water. The first non-condensable gas separator 2 is set in the inlet pipe 5, the second non-condensable gas separator 4 is set in the outlet pipe 6, and the non-condensable gas outlet of the evaporator 3 is connected to the second non-condensable gas separator 4.

[0033] Understandably, some non-condensable gases that are insoluble in water will be generated during the heating process of the raw water. These non-condensable gases will re-dissolve in the water when the temperature drops, thus affecting the quality of the final produced water for injection. Therefore, it is necessary to separate and release these gases by passing them through the first non-condensable gas separator 2 and the second non-condensable gas separator 4 when the raw water is heated or at a high temperature. The first non-condensable gas separator 2 and the second non-condensable gas separator 4 are water tanks with insulation cotton. The exhaust port at the top periodically discharges the non-condensable gases in the heated water. Furthermore, the exhaust port of the first non-condensable gas separator 2 is equipped with a third valve body 26, and the exhaust port of the second non-condensable gas separator 4 is equipped with a fourth valve body 27. The release of non-condensable gases is controlled by the third valve body 26, and the fourth valve body 27 is opened when the entire system drains water to ensure that the water in the entire system is completely drained.

[0034] It should be noted that the valve body mentioned in this article can be selected according to actual needs, such as a general diaphragm valve, a proportional valve, or a general pneumatic valve, and the function of controlling flow is achieved by adding limit switches, etc. This article does not make specific limitations.

[0035] In this embodiment, the evaporator 3 uses a jacket 28 for auxiliary heating. That is, the evaporator 3 has a jacket 28 for auxiliary heating fitted around the bottom outer periphery of the tube-type evaporator 3. The jacket 28 surrounds the tank body, forming a relatively independent space, as detailed below. Figure 2As shown, when the evaporator 3 starts operating, the heat medium is introduced into the jacket 28. In this embodiment, the heat medium is industrial steam. The industrial steam carries a large amount of heat energy into the space of the jacket 28 and flows in the jacket 28. It heats the raw water in the tube side of the evaporator 3 through the wall of the jacket 28. After the raw water is heated into steam, it enters the pressurization pipe 29 from the top. The pressurization pipe 29 is connected to the compressor 30. The compressor 30 pressurizes the steam and then sends it into the shell side of the evaporator 3. That is to say, in this embodiment, the raw water in the tube side of the evaporator 3 will absorb the heat from the industrial steam in the jacket 28 and the heat carried by the raw water itself when it becomes steam. The steam sent into the shell side of the evaporator 3 will be re-condensed into water for injection after the raw water in the tube side absorbs the heat and is discharged from the outlet pipe 6. This setting not only utilizes the heat of the steam itself to reduce the amount of industrial steam used, but also avoids leakage of the U-shaped tube directly inserted into the evaporator 3 for auxiliary heating, which would cause industrial steam to contaminate the water for injection.

[0036] In this embodiment, the tube side of the first heat exchanger 1 is used for the passage of raw water, while the inlet of the shell side is connected to the waste heat pipe 7 of the factory. The waste heat pipe 7 is filled with gas, liquid or gas-liquid mixture generated by the factory. After the gas, liquid or gas-liquid mixture preheats the raw water in the tube side of the first heat exchanger 1, it will be discharged directly from the discharge channel.

[0037] In addition, in this embodiment, a fifth valve body 31 is also provided on the water inlet pipe 5. The preheated raw water will enter the evaporator 3 through the fifth valve body 31, and the flow rate into the evaporator 3 will be intelligently adjusted by the liquid level monitoring and control of the fifth valve body 31 set in the evaporator 3.

[0038] In summary, this invention, by incorporating two non-condensable gas emission devices—a first non-condensable gas separator 2 and a second non-condensable gas separator 4—into the water-to-injection preparation system, releases the non-condensable gases generated during the preheating of the raw water in the inlet pipe 5, and releases the non-condensable gases generated during the evaporation and condensation process of the raw water after entering the evaporator 3. In other words, the first non-condensable gas separator 2 and the second non-condensable gas separator 4 are respectively installed on the inlet pipe 5 and the outlet pipe 6. This arrangement ensures the release of non-condensable gases during both the preheating and evaporation / condensation stages of the raw water, thereby eliminating non-condensable gases from the water for injection and improving the water quality.

[0039] Furthermore, the heat exchanger in this invention uses waste heat from the factory, which is generated by the factory and contains heat in the form of gas, liquid, or gas-liquid mixture. By preheating the raw water with waste heat from the factory, the heat energy required for the evaporator 3 to evaporate and condense the raw water can be reduced. In this way, the energy consumed by the entire preparation system can be reduced.

[0040] Furthermore, it also includes a second heat exchanger 9, the tube side of which is connected to the inlet pipe 5 and is located downstream of the first heat exchanger 1. The shell side inlet of the second heat exchanger 9 is connected to the concentrate outlet of the evaporator 3, and the shell side outlet of the second heat exchanger 9 is connected to the discharge pipe 8.

[0041] Understandably, during the evaporation and condensation process of the raw water, the evaporator 3 will generate some wastewater with a high temperature, namely concentrated water. In this embodiment, in order to reuse the temperature of the concentrated water discharged from the evaporator 3, a second heat exchanger 9 is set downstream of the first evaporator 3. The inlet pipe 5 is connected to the tube side of the second heat exchanger 9, that is, the raw water passes through the tube side of the second heat exchanger 9, while the concentrated water outlet of the evaporator 3 is connected to the shell side inlet of the second heat exchanger 9. In other words, the temperature of the concentrated water can be used to further heat the raw water, thereby reducing the amount of industrial steam required for the final evaporation and condensation of the evaporator 3. In this embodiment, the concentrated water will also be directly discharged into the discharge pipe 8 after completing the heat exchange. Moreover, in this embodiment, a sixth valve body 32 is also set on the pipe between the concentrated water outlet and the shell side inlet of the second heat exchanger 9 to control the discharge of concentrated water.

[0042] Furthermore, it also includes a third heat exchanger 10, the tube side of which is connected to the inlet pipe 5 and is located downstream of the second heat exchanger 9. The shell side inlet of the third heat exchanger 10 is connected to the non-condensable gas outlet, and the shell side outlet of the third heat exchanger 10 is connected to the second non-condensable gas separator 4 and the discharge pipe 8, respectively.

[0043] Understandably, a large amount of high-temperature non-condensable gas will be generated during the evaporation and condensation of the raw water in the evaporator 3. In this embodiment, a third heat exchanger 10 is also set downstream of the second heat exchanger 9. Similarly, the tube side of the third heat exchanger 10 is connected to the water inlet pipe 5, and the raw water is introduced into it. The shell side of the third heat exchanger 10 is connected to the non-condensable gas outlet of the evaporator 3. In this way, the high-temperature non-condensable gas generated by the evaporator 3 can be used to further preheat the raw water, thereby reducing the industrial steam required by the evaporator 3.

[0044] After the high-temperature non-condensable gas passes through the third heat exchanger 10, it will be discharged into the discharge pipe 8. However, in order to balance the gas pressure in the system, the shell-side outlet of the third heat exchanger 10 is also connected to the second non-condensable gas separator 4. Similarly, the non-condensable gas outlet of the evaporator 3 is also connected to the second non-condensable gas separator 4. This is also to balance the pressure in the system and ensure that the non-condensable gas can flow and circulate in the pipe.

[0045] In one possible implementation, a fourth heat exchanger 11 and a fifth heat exchanger 12 are also included, both of which have their tube sides connected to the inlet pipe 5. The fourth heat exchanger 11 is located between the third heat exchanger 10 and the evaporator 3, and the fifth heat exchanger 12 is located between the first heat exchanger 1 and the second heat exchanger 9. The shell-side inlet of the fourth heat exchanger is connected to the industrial steam inlet 13, the shell-side outlet of the fourth heat exchanger 11 is connected to the shell-side inlet of the fifth heat exchanger 12, the shell-side outlet of the fifth heat exchanger 12 is connected to the discharge pipe 8, and the industrial steam discharge port 24 of the evaporator 3 is connected to the shell-side inlet of the fifth heat exchanger 12.

[0046] In order to further preheat the raw water, a fourth heat exchanger 11 is also provided in this embodiment. The tube side of the fourth heat exchanger 11 is also located on the water inlet pipe 5, and the fourth heat exchanger 11 is located downstream of the third heat exchanger 10. However, the shell side inlet of the fourth heat exchanger 11 is connected to the industrial steam inlet 13. That is to say, the raw water flowing through the fourth heat exchanger 11 will be heated by high-temperature industrial steam.

[0047] However, after heating the raw water, the industrial steam still retains a certain temperature. Therefore, in order to improve the utilization rate of the industrial steam and reduce the amount of industrial steam used by the evaporator 3, this embodiment also provides a fifth heat exchanger 12. The shell-side outlet of the fourth heat exchanger 11 will be connected to the shell-side inlet of the fifth heat exchanger 12. That is to say, the fifth heat exchanger 12 will reuse the industrial steam (it should be noted that some of the high-temperature condensate formed by the industrial steam will be mixed with the industrial steam and enter the shell side of the fifth heat exchanger 12). However, since the temperature of the industrial steam has decreased compared to the beginning, this embodiment sets the fifth heat exchanger 12 on the inlet pipe 5 between the first heat exchanger 1 and the second heat exchanger 9. At this time, the temperature of the raw water has not yet risen too high, so the fifth heat exchanger 12 can preheat the raw water in advance. After the industrial steam is heated again, most of it will condense into liquid water at a lower temperature and be discharged from the shell side of the fifth heat exchanger 12 into the discharge pipe 8.

[0048] Furthermore, it is understandable that when industrial steam is introduced into the jacket 28 of evaporator 3 for auxiliary heating, it still has a certain temperature after being discharged from the industrial steam outlet. Therefore, in order to improve the utilization rate of industrial steam, this embodiment also reuses the industrial steam discharged from the industrial steam outlet of evaporator 3 and introduces it into the shell-side inlet of the fifth heat exchanger 12. In this way, the shell-side of the fifth heat exchanger 12 uses the industrial steam that was used by the fourth heat exchanger 11 and evaporator 3 to preheat the raw water.

[0049] Furthermore, it also includes a sixth heat exchanger 14, the tube side of which is connected to the outlet pipe 6, and the shell side of which is connected to the inlet pipe 5 between the second heat exchanger 9 and the third heat exchanger 10.

[0050] It is understandable that the water for injection produced by evaporator 3 will have a certain temperature when it is output. Therefore, in this embodiment, in order to maximize the utilization of heat energy, a sixth heat exchanger 14 is also provided on the water outlet pipe 6. The difference is that the water inlet pipe 5 is connected to the tube side of the sixth heat exchanger 14, while the shell side of the sixth heat exchanger 14 is connected to the water inlet pipe 5 between the second heat exchanger 9 and the third heat exchanger 10. In this way, when the raw water flows through the sixth heat exchanger 14, it can utilize the heat carried by the water for injection itself, thereby reducing the amount of industrial steam required by evaporator 3.

[0051] In this embodiment, it should be noted that the temperatures of the first heat exchanger 1, the fifth heat exchanger 12, the second heat exchanger 9, the sixth heat exchanger 14, the third heat exchanger 10, and the fourth heat exchanger 11 gradually increase, which allows the raw water in the inlet pipe 5 to be gradually heated.

[0052] In one possible implementation, a first non-condensable gas separator 2 is disposed between a third heat exchanger 10 and a fourth heat exchanger 11, and a first circulating pump 15 is disposed between the first non-condensable gas separator 2 and the fourth heat exchanger 11. A drain pipe 16 is disposed between the first circulating pump 15 and the fourth heat exchanger 11. The drain pipe 16 is connected to a discharge pipe 8, and a first valve body 17 is disposed on the drain pipe 16.

[0053] In this embodiment, the first non-condensable gas separator 2 is used to release the non-condensable gas generated in the raw water in the inlet pipe 5 during the heating process, while the first circulation pump 15 can pressurize the raw water in the inlet pipe 5 to drive the circulation of the raw water. It should be noted that the first circulation pump 15 is located downstream of the first non-condensable gas separator 2, and can repressurize the raw water after the first non-condensable gas separator 2 releases the gas, so as to prevent the raw water from having no power to continue to flow forward and circulate after passing through the first non-condensable gas separator 2.

[0054] In addition, in order to release the raw material water remaining in the entire system after the entire preparation system stops, a drain pipe 16 is provided in the first circulation pump 15 and connected to the discharge pipe 8. When the preparation system is working normally, the first valve body 17 will be in the closed state, and when water needs to be discharged, the first valve body 17 will be opened to release water.

[0055] Similarly, a pipe is connected to the bottom of the evaporator 3 to the discharge pipe 8, and a seventh valve body 33 is installed on the pipe, through which the entire evaporator 3 can be emptied.

[0056] In one possible implementation, the second non-condensable gas separator 4 is disposed between the sixth heat exchanger 14 and the evaporator 3, and the sixth heat exchanger 14 and the second non-condensable gas separator 4 are provided with a second circulation pump 18.

[0057] In this embodiment, the second circulating pump 18 is also located downstream of the second non-condensable gas separator 4, which can pressurize the injection water after the non-condensable gas has been released to make its flow smoother.

[0058] Of course, the positions of the first non-condensable gas separator 2 and the second non-condensable gas separator 4 can be adjusted appropriately, as long as they can release the non-condensable gas in the inlet pipe 5 and the outlet pipe 6. However, it should be noted that the positions of the first circulation pump 15 and the second circulation pump 18 also need to be adjusted according to their positions.

[0059] In one possible implementation, a shut-off pipe 19 is connected between the shell-side inlet and shell-side outlet of the sixth heat exchanger 14, and a second valve body 20 is provided on the shut-off pipe 19 for controlling its connection or closure.

[0060] In this embodiment, to prevent the final output water for injection from being too cold, a shut-off pipe 19 is also provided. When the temperature of the final output water for injection is detected to be too low, the second valve body 20 will be opened to divert the raw material and reduce the amount of raw material water passing through the shell side of the sixth heat exchanger 14, so as to prevent the raw material water from absorbing too much heat from the water for injection. However, when the temperature of the water for injection is sufficient, the second valve body 20 can be closed so that all the raw material water can pass through the sixth heat exchanger 14 and utilize the heat of the water for injection.

[0061] In one possible implementation, a tenth valve body 21 is provided between the industrial steam inlet 13 and the shell-side inlet of the fourth heat exchanger 11, and an eleventh valve body 23 is provided between the industrial steam inlet 13 and the industrial steam inlet 22 of the evaporator 3.

[0062] Understandably, by detecting the inlet water temperature in the evaporator 3, the opening of the tenth valve body 21 is proportionally controlled. When the temperature is high, the valve opening is reduced, thus saving industrial steam consumption. Similarly, the evaporator 3 controls the industrial steam to enter the jacket 28 of the evaporator 3 to heat the raw water through the eleventh valve body 23. The eleventh valve body 23 is proportionally controlled by the pressure inside the evaporator 3 to precisely control the industrial steam consumption and reduce industrial steam usage.

[0063] In one possible implementation, a sampling port 25 is provided on the outlet pipe 6 downstream of the sixth heat exchanger 14.

[0064] In this embodiment, the sampling port 25 provided on the water outlet pipe 6 allows operators to conveniently inspect the produced water for injection and determine its quality. Simultaneously, the sampling port 25 is also equipped with a temperature sensor to monitor the water temperature and a conductivity meter to monitor the water quality, thus comprehensively determining whether the water for injection is qualified. Furthermore, downstream of the sampling port 25, the water outlet pipe 6 has a pipeline connected to the discharge pipe 8, and this pipeline is equipped with an eighth valve body 34. Thus, if the water for injection detected by the sampling port 25 is unqualified, the eighth valve body 34 will open, allowing it to be discharged directly; if it is qualified, the ninth valve body 35 at the end of the water outlet pipe 6 will open, transporting the water for injection to the storage tank.

[0065] In summary, this invention provides a water-for-injection preparation system, comprising a preheating unit and a preparation unit connected sequentially. The preheating unit sequentially includes a factory waste heat recovery heat exchanger (first heat exchanger 1), an industrial steam condensate heat exchanger (fifth heat exchanger 12), a concentrate heat exchanger (second heat exchanger 9), a water-for-injection heat exchanger (sixth heat exchanger 14), a non-condensable gas heat exchanger (third heat exchanger 10), a first non-condensable gas separator 2, and a first circulating pump 15. The preparation unit includes a main heating heat exchanger (fourth heat exchanger 11), an evaporator 3, a compressor 30, a second non-condensable gas separator 4, and a second circulating pump 18. It has the following beneficial effects: 1. It adds a factory waste heat recovery module to utilize factory waste heat, reducing the system's consumption of industrial steam; 2. The system adopts a dual non-condensable gas emission system. Non-condensable gas emission devices are installed in both the raw water preheating stage and the pure steam condensation stage to remove non-condensable gases from the injection water and improve the quality of the injection water; 3. Evaporator 3 uses jacket 28 for auxiliary heating to eliminate the risk of leakage from the industrial steam heating pipe extending into the main body of evaporator 3; 4. Valve body and valve body precise control: the raw water inlet is controlled by the liquid level of evaporator 3, and a proportional regulating valve is used for precise control to improve heat exchange efficiency. The main heater, the fourth heat exchanger 11, and the auxiliary heating of evaporator 3 are precisely controlled by a proportional regulating valve to control the industrial steam consumption and avoid waste of industrial steam. The injection water production water temperature is precisely controlled by a proportional regulating valve, which can produce injection water at room temperature or high temperature; Evaporator 3 adopts a natural circulation design, a shell-and-tube rising film structure, and a gas-liquid separator is installed at the top to achieve gravity separation and demisting separation.

[0066] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] The embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A system for preparing water for injection, characterized in that, include: The system comprises a first heat exchanger (1), a first non-condensable gas separator (2), an evaporator (3), and a second non-condensable gas separator (4). The evaporator (3) is connected to an inlet pipe (5) and an outlet pipe (6). The evaporator (3) is used to evaporate and condense the raw water introduced through the inlet pipe (5) to form water for injection and to discharge the water for injection through the outlet pipe (6). The tube side of the first heat exchanger (1) is connected to the inlet pipe (5). The shell side inlet of the first heat exchanger (1) is connected to the waste heat pipe (7) of the factory. The shell side outlet of the first heat exchanger (1) is connected to the discharge pipe (8). The first heat exchanger (1) is used to preheat the raw water. The first non-condensable gas separator (2) is located in the inlet pipe (5). The second non-condensable gas separator (4) is located in the outlet pipe (6). The non-condensable gas outlet of the evaporator (3) is connected to the second non-condensable gas separator (4).

2. The water-for-injection preparation system according to claim 1, characterized in that, It also includes a second heat exchanger (9), the tube side of which is connected to the inlet pipe (5) and is located downstream of the first heat exchanger (1), the shell side inlet of the second heat exchanger (9) is connected to the concentrate outlet of the evaporator (3), and the shell side outlet of the second heat exchanger (9) is connected to the discharge pipe (8).

3. The water-for-injection preparation system according to claim 2, characterized in that, It also includes a third heat exchanger (10), the tube side of which is connected to the inlet pipe (5) and is located downstream of the second heat exchanger (9). The shell side inlet of the third heat exchanger (10) is connected to the non-condensable gas outlet, and the shell side outlet of the third heat exchanger (10) is connected to the second non-condensable gas separator (4) and the discharge pipe (8) respectively.

4. The water-for-injection preparation system according to claim 3, characterized in that, It also includes a fourth heat exchanger (11) and a fifth heat exchanger (12), both of which have their tube sides connected to the inlet pipe (5). The fourth heat exchanger (11) is located between the third heat exchanger (10) and the evaporator (3), and the fifth heat exchanger (12) is located between the first heat exchanger (1) and the second heat exchanger (9). The shell side inlet of the fourth heat exchanger is connected to the industrial steam inlet (13), the shell side outlet of the fourth heat exchanger (11) is connected to the shell side inlet of the fifth heat exchanger (12), the shell side outlet of the fifth heat exchanger (12) is connected to the discharge pipe (8), and the industrial steam discharge port (24) of the evaporator (3) is connected to the shell side inlet of the fifth heat exchanger (12).

5. The water-for-injection preparation system according to claim 4, characterized in that, It also includes a sixth heat exchanger (14), the tube side of which is connected to the outlet pipe (6), and the shell side of which is connected to the inlet pipe (5) between the second heat exchanger (9) and the third heat exchanger (10).

6. The water-for-injection preparation system according to claim 4, characterized in that, The first non-condensable gas separator (2) is located between the third heat exchanger (10) and the fourth heat exchanger (11), and a first circulating pump (15) is provided between the first non-condensable gas separator (2) and the fourth heat exchanger (11). A drain pipe (16) is provided between the first circulating pump (15) and the fourth heat exchanger (11). The drain pipe (16) is connected to the discharge pipe (8), and a first valve body (17) is provided on the drain pipe (16).

7. The water-for-injection preparation system according to claim 5, characterized in that, The second non-condensable gas separator (4) is located between the sixth heat exchanger (14) and the evaporator (3), and the sixth heat exchanger (14) and the second non-condensable gas separator (4) are equipped with a second circulation pump (18).

8. The water-for-injection preparation system according to claim 7, characterized in that, The sixth heat exchanger (14) is connected to a shut-off pipe (19) between its shell-side inlet and shell-side outlet. The shut-off pipe (19) is provided with a second valve body (20) for controlling its connection or closure.

9. The water-for-injection preparation system according to claim 4, characterized in that, A tenth valve body (21) is provided between the industrial steam inlet (13) and the shell-side inlet of the fourth heat exchanger (11), and an eleventh valve body (23) is provided between the industrial steam inlet (13) and the industrial steam inlet (22) of the evaporator (3).

10. The water-for-injection preparation system according to claim 8, characterized in that, A sampling port (25) is provided on the water outlet pipe (6) downstream of the sixth heat exchanger (14).

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