Low-temperature multi-effect seawater desalination vacuum leakage detection system

Abstract

The utility model provides a low-temperature multi-effect seawater desalination vacuum leakage detection system. The system comprises a booster pump, a volatilization device and an extraction valve, the booster pump is sequentially connected with the pressurizing ejector and the pressurizing valve; the pressurizing ejector is externally connected with a volatilization device; the pressure increasing valve is connected with a plurality of effect body evaporators through vacuum connecting pipelines; the extraction valve is connected with the multiple effect body evaporators at the same time. The multiple effect body evaporators are each provided with an isolation partition valve. The volatilization device is filled with colored smoke. According to the low-temperature multi-effect seawater desalination vacuum leakage detection system provided by the invention, the system can be subjected to vacuum leakage detection treatment more conveniently, accurately and efficiently, leakage points can be quickly searched and eliminated in a temporary hot standby state of the seawater desalination system, and the situation that the system cannot be in a standby state due to long-time shutdown guide is avoided.

Description

Technical Field

[0001] This application relates to the field of seawater desalination, and particularly to a vacuum leak detection system for low-temperature multi-effect seawater desalination. Background Art

[0002] The low-temperature multi-effect seawater desalination device mainly utilizes the principle that under a vacuum state, the boiling point of water is low to achieve the evaporation of seawater by low-temperature steam to produce fresh water. Based on the above principle, the low-temperature multi-effect seawater desalination device must maintain a certain vacuum state to enable the normal operation of the seawater desalination device or operate at the rated output. However, as the seawater desalination device operates for a long time, internal leakage of valves will frequently occur, reducing the vacuum degree of the seawater desalination device, thereby causing a decrease in its water production and an increase in steam energy consumption. In severe cases, it can cause the seawater desalination device to malfunction. At this time, it is necessary to detect leaks in the system to ensure that the leak points are found and eliminated, and the vacuum degree is restored, so that the seawater desalination device can be normally started and operated. The low-temperature multi-effect seawater desalination device itself has a large number of potential leakage points, including flanges, joints, valves, expansion joints, pipelines, welds, etc.

[0003] The vacuum ejector is an on-line vacuum pumping device for the low-temperature multi-effect seawater desalination device. At present, the main method for detecting vacuum leaks in the low-temperature multi-effect seawater desalination device is to start the vacuum ejector of the seawater desalination device to establish a certain negative pressure state, and use the suction force generated under the negative pressure to rely on touching by hand to find the leakage points. Since air will be inhaled at the leak point position under the negative pressure condition and generate sounds, the method of listening with the ear can also be used to find the leakage points.

[0004] However, the above methods have poor reliability and low accuracy; the inspection of vacuum leak points in the device requires checking each system and equipment of the seawater desalination device one by one. Since the general industrial low-temperature multi-effect seawater desalination device is large in size and has a large number of potential leakage points, the inspection takes a long time and has low efficiency. Some of the potential leakage points are located at high positions, without a working platform, and are wrapped with thermal insulation materials, making it difficult to find such potential leakage points with the existing leak detection methods. Summary of the Invention

[0005] In view of the above problems, this application provides a vacuum leak detection system for low-temperature multi-effect seawater desalination, which can more conveniently, accurately, and efficiently perform vacuum leak detection on the system. It can quickly find and eliminate leak points in the temporary hot standby state of the seawater desalination system, avoiding the unusable state caused by the long-term shutdown of the system.

[0006] To achieve the purpose of this application, the following technical solutions are provided in this application:

[0007] A low-temperature multi-effect seawater desalination vacuum leak detection system, comprising: a booster pump, a volatilization device, and an air extraction valve; the booster pump is sequentially connected to a booster ejector and a booster valve; the booster ejector is externally connected to a volatilization device; the booster valve is connected to a plurality of effect evaporators through a vacuum connection pipeline; the air extraction valve is simultaneously connected to a plurality of the effect evaporators; isolation partition valves are installed on each of the plurality of effect evaporators; colored smoke is filled in the volatilization device.

[0008] In a possible implementation manner, the outlet pipeline of the first-effect evaporator is sequentially connected to the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator, the fifth-effect evaporator, the sixth-effect evaporator, the seventh-effect evaporator, the eighth-effect evaporator, the ninth-effect evaporator, the tenth-effect evaporator, the eleventh-effect evaporator, the twelfth-effect evaporator, the thirteenth-effect evaporator, the fourteenth-effect evaporator, and a falling film condenser.

[0009] In a possible implementation manner, a plurality of the evaporators are all connected to explosion-proof membranes.

[0010] In a possible implementation manner, it further includes a gas supply valve. The gas supply pipelines of the gas supply valve are respectively connected to a primary ejector and a secondary ejector and then merged into a silencing cooler. The gas supply pipelines of the gas supply valve become thinner from thick; the outlet pipeline of the primary ejector is sequentially connected to the secondary ejector and the silencing cooler.

[0011] In a possible implementation manner, a pressure indicator is externally connected to the inlets of the primary ejector and the secondary ejector.

[0012] In a possible implementation manner, another inlet pipeline of the primary ejector is connected to one end of the air extraction valve; the other end of the air extraction valve is externally connected to the vacuum connection pipeline between the booster valve and the effect evaporator.

[0013] In a possible implementation manner, isolation valves are connected before and after the pipeline of the pressure indicator.

[0014] In a possible implementation manner, the booster pump, the primary ejector, and the silencing cooler are all externally connected to a sewage discharge tank.

[0015] In a possible implementation manner, isolation valves are connected to the pipelines between the booster pump, the primary ejector, the silencing cooler and the sewage discharge tank.

[0016] In a possible implementation manner, a decentralized staggered isolation distribution framework is installed inside the volatilization device, and a temperature adjustment device is installed at the bottom.

[0017] The beneficial effects of the embodiments of the present application are as follows: The method of visual colored smoke adopted in the present application is more convenient and intuitive; the leak detection method changes from individual search to overall one-time inspection, which takes less time and has high efficiency; the search is more accurate; and a comprehensive inspection of the entire system is achieved. The solution of the present application is easy to implement, has a small modification range, and strong functional applicability, and can quickly find and eliminate leakage points in the temporary standby state of the seawater desalination system, avoiding long-term shutdown of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application, and do not constitute a limitation to the present application.

[0019] Figure 1 It is a schematic structural diagram of a vacuum leak detection system for low-temperature multi-effect seawater desalination provided by an embodiment of the present application.

[0020] 1 - Booster pump; 2 - Evaporation device; 3 - Booster ejector; 4 - Booster valve; 5 - Air extraction valve; 6 - Primary ejector; 7 - Air supply valve; 8 - Silencer cooler; 9 - Secondary ejector; 10 - Falling film condenser; 11 - Fourteen-effect evaporator; 12 - First-effect evaporator; 13 - Six-effect evaporator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0022] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0023] Embodiment 1

[0024] Figure 1 A vacuum leak detection system for low-temperature multi-effect seawater desalination provided by an embodiment of the present application includes: a booster pump 1, an evaporation device 2, a booster ejector 3, an effect body evaporator, and a vacuum pumping system; the outlet pipeline of the booster pump 1 is connected to the booster ejector 3, the booster ejector 3 is externally connected to an evaporation device 2, and the booster ejector 3 is connected to the effect body evaporator through a vacuum connection pipeline; colored smoke is filled in the evaporation device 2.

[0025] Optionally, the colored smoke is a mixture of one or more of bright red, bright orange, bright yellow, fluorescent green, cyan, blue, and purple;

[0026] Specifically, a decentralized staggered isolation distribution framework is installed inside the volatilization device 2;

[0027] Specifically, the colored smoke is loaded into the volatilization device 2 under negative pressure. The booster pump 1 is used for boosting pressure, and the booster injector 3 is used to enhance the injection effect, uniformly volatilizing and transporting the colored smoke to the body evaporator and connecting pipelines of the seawater desalination device;

[0028] Optionally, the colored smoke loaded in the volatilization device 2 can be replaced with a gas having a volatile odor.

[0029] In a possible implementation manner, the booster pump 1 is sequentially connected to the booster injector 3 and the booster valve 4;

[0030] Specifically, the booster injector 3 can make the gas form a negative pressure inside it;

[0031] Specifically, the booster pump 1 is externally connected to a sewage tank.

[0032] In a possible implementation manner, a temperature adjustment device is installed at the bottom of the volatilization device 2;

[0033] Specifically, the temperature adjustment device is used to enhance the control of the volatility of the volatilization device 2. As the temperature rises, the volatility of the volatilization device 2 will increase.

[0034] In a possible implementation manner, the booster valve 4 is respectively connected to the first-effect evaporator 12, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator, the fifth-effect evaporator, the sixth-effect evaporator 13, the seventh-effect evaporator, the eighth-effect evaporator, the ninth-effect evaporator, the tenth-effect evaporator, the eleventh-effect evaporator, the twelfth-effect evaporator, the thirteenth-effect evaporator, the fourteenth-effect evaporator 11, and the falling-film condenser 10 through vacuum connection pipelines;

[0035] Specifically, the first-effect evaporator 12 is used to complete the first-stage evaporation process of the entire device; the sixth-effect evaporator 13 is used to complete the sixth-stage evaporation process of the entire device; the fourteenth-effect evaporator 11 is used to complete the fourteenth-stage evaporation process of the entire device;

[0036] In a possible implementation manner, the outlet pipeline of the first-effect evaporator 12 is sequentially connected in series with the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator, the fifth-effect evaporator, the sixth-effect evaporator 13, the seventh-effect evaporator, the eighth-effect evaporator, the ninth-effect evaporator, the tenth-effect evaporator, the eleventh-effect evaporator, the twelfth-effect evaporator, the thirteenth-effect evaporator, the fourteenth-effect evaporator 11, and the falling-film condenser 10;

[0037] In a possible implementation, an explosion-proof membrane is installed on each effect body evaporator;

[0038] Specifically, an explosion-proof membrane is installed on each effect body evaporator. When the pressure exceeds the range, the explosion-proof membrane ruptures. The explosion-proof membrane is used to protect the system pressure within the controlled pressure range.

[0039] In a possible implementation, an isolation partition valve is installed on each effect body evaporator;

[0040] Specifically, the isolation partition valve divides and isolates the vacuum leakage positions, and can quickly detect the leakage location and eliminate the leakage point.

[0041] In a possible implementation, in the vacuum state, the gas supply valve 7 is sequentially connected to the first-stage ejector 6, the second-stage ejector 9, and the silencing cooler 8 through the gas supply pipeline;

[0042] Specifically, the first-stage ejector 6 is the first-stage device responsible for initial compression and evaporation in the entire multi-effect seawater desalination system.

[0043] In a possible implementation, when supplying auxiliary steam to the vacuum pipeline, the gas supply valve 7 is connected to the first-stage ejector 6 and the second-stage ejector 9 respectively through the gas supply pipeline and then merged into the silencing cooler 8;

[0044] Specifically, the pipeline between the gas supply valve 7 and the first-stage ejector 6 and the second-stage ejector 9 becomes thinner from thick, for providing high-speed fluid;

[0045] Specifically, the auxiliary steam sequentially enters the first-stage ejector 6 and the second-stage ejector 9 through the gas supply valve 7, and finally is discharged to the atmosphere through the silencing cooler 8.

[0046] In a possible implementation, the silencing cooler 8 is externally connected to a sewage discharge tank, and an isolation valve is connected to the pipeline between the silencing cooler 8 and the sewage discharge tank;

[0047] Specifically, the silencing cooler is used to reduce the noise generated during the cooling process, thereby reducing the interference to the surrounding environment.

[0048] In a possible implementation, a pressure indicator is externally connected to the inlets of both the first-stage ejector 6 and the second-stage ejector 9, and the outlet pipelines of the two pressure indicators are both connected to the outlet pipeline of the first-stage ejector;

[0049] In a possible implementation, isolation valves are installed at both the inlet and outlet of the pipelines of the two pressure indicators;

[0050] In a possible implementation, the inlet of the first-stage ejector 6 is connected to the sewage discharge tank, and an isolation valve is connected to the pipeline between the first-stage ejector 6 and the sewage discharge tank; <�

[0051] Specifically, the sewage box is used to receive the condensed water in the pipeline;

[0052] In a possible implementation manner, another inlet pipeline of the first-stage ejector 6 is connected to one end of the air extraction valve 5; the other end of the air extraction valve 5 is externally connected to the vacuum connection pipeline between the booster valve 4 and the effect body evaporator;

[0053] In a possible implementation manner, when the low-temperature multi-effect seawater desalination device is in operation, the auxiliary steam enters the first-stage ejector 6, the second-stage ejector 9, and the air extraction valve 5 in sequence through the air supply valve. The air extraction valve 5 extracts the internal air of each effect body evaporator through a pipeline to keep it in a vacuum state, maintaining the seawater desalination system in a negative pressure state for the desalinated water production process.

[0054] In a possible implementation manner, when the low-temperature multi-effect seawater desalination device is in a vacuum leak detection state, the booster pump 1 provides a power air source for the booster ejector 3, and the volatilization device 2 provides a filling air source for the effect body evaporator. Under a negative pressure state, the volatilization device 2 releases the internally filled volatile colored smoke. Since a temperature adjustment device is configured at its bottom, the temperature can be adjusted according to the characteristics of the volatile substance to enable better diffusion of the colored smoke. Therefore, the colored smoke can be transported to the effect body evaporator and the connecting pipeline of the effect body evaporator for quickly detecting the leakage location and eliminating the leak point.

[0055] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it. The present application is not limited to the exact structure already described and illustrated in the drawings, and it cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application pertains, without departing from the concept of the present application, various changes and deformations made should be regarded as falling within the protection scope of the present application.

Claims

1. A low-temperature multi-effect seawater desalination vacuum leak detection system, characterized in that: include: Booster pump (1), volatilization device (2), air extraction valve (5); The boost pump (1) is sequentially connected to a boost injector (3) and a boost valve (4); The boost injector (3) is externally connected to a volatilization device (2); The boost valve (4) is connected to a plurality of effect evaporators via a vacuum connection pipeline; The air extraction valve (5) is connected to a plurality of the effect evaporators at the same time; Isolation and partition valves are installed on the multiple effect evaporators; The volatilization device (2) is filled with colored smoke.

2. The vacuum leak detection system according to claim 1, characterized in that: The plurality of effect evaporators include a first-effect evaporator (12), and an outlet pipeline of the first-effect evaporator (12) is sequentially connected to a second-effect evaporator, a third-effect evaporator, a fourth-effect evaporator, a fifth-effect evaporator, a sixth-effect evaporator (13), a seventh-effect evaporator, an eighth-effect evaporator, a ninth-effect evaporator, a tenth-effect evaporator, an eleventh-effect evaporator, a twelfth-effect evaporator, a thirteenth-effect evaporator, a fourteenth-effect evaporator (11), and a falling film condenser (10).

3. The vacuum leak detection system according to claim 2, characterized in that: The plurality of effect evaporators are all connected with explosion-proof membranes.

4. The vacuum leak detection system according to claim 1, characterized in that: It also includes an air supply valve (7), wherein the air supply pipe of the air supply valve (7) is respectively connected to the first-stage ejector (6) and the second-stage ejector (9) and then merged into the muffler cooler (8), and the air supply pipe of the air supply valve (7) is tapered; The outlet pipe of the first-stage ejector (6) is connected to the second-stage ejector (9) and the muffler cooler (8) in sequence.

5. The vacuum leak detection system according to claim 4, characterized in that: The inlets of the first-stage injector (6) and the second-stage injector (9) are externally connected to a pressure indicator.

6. The vacuum leak detection system according to claim 4, characterized in that: Another inlet pipeline of the first-stage ejector (6) is connected to one end of the air extraction valve (5); the other end of the air extraction valve (5) is externally connected to the vacuum connection pipeline between the boost valve (4) and the effect evaporator.

7. The vacuum leak detection system according to claim 5, characterized in that: The pressure indicator pipeline is connected to isolation valves before and after.

8. The vacuum leak detection system according to claim 7, characterized in that: The booster pump (1), the first-stage ejector (6), and the muffler cooler (8) are all externally connected to a sewage tank.

9. The vacuum leak detection system according to claim 8, characterized in that: The pipelines between the booster pump (1), the first-stage ejector (6), the muffler cooler (8) and the sewage tank are all connected with isolation valves.

10. The vacuum leak detection system according to claim 1, characterized in that: A dispersed staggered isolation distribution frame is installed inside the volatilization device (2), and a temperature regulating device is installed at the bottom.

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