Exhaust pressure-equalizing connecting device for water pump in hot-method seawater desalination process
By using the exhaust pressure equalization connection device in the thermal seawater desalination process, the problem that the process water pump cannot fill the liquid due to negative pressure vacuum is solved, and the safe and stable operation of the process water pump and the connection pipeline and the reliability of the reverse pump operation are achieved.
Patent Information
- Application Number
- CN202421055131.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-15
AI Technical Summary
In the thermal seawater desalination process, the process water pump cannot fill the liquid due to negative pressure vacuum or leakage, resulting in the inability to exhaust gas normally during the start of the pump and reverse operation, affecting the safe and stable operation of the main evaporator of the seawater desalination body.
It provides a thermal seawater desalination process water pump exhaust pressure equalization connection device, including a vacuum device, a pressure equalization pipeline and multiple process water pump groups. The pressure equalization pipe and the outlet end of the process water pump group are connected through the pressure equalization pipeline to realize the pressure equalization on the inlet and outlet sides of the process water pump group, ensuring that the process water pump and the connecting pipe are full of liquid before starting the pump, and completely exhaust the internal air through the vacuum injector.
Effectively prevent the process water pump from being unable to fill the liquid due to negative pressure vacuum, improve the reliability of the inverted pump operation, avoid the high liquid level shutdown of the main evaporator of the seawater desalination body, and ensure the safe and stable operation of the process water pump.
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Figure CN222556630U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of seawater desalination equipment, and in particular to an exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process. Background Art
[0002] Thermal desalination includes low-temperature multi-effect distillation, multi-stage flash evaporation, compressed steam distillation, dew point evaporation, hydropower cogeneration, thermal film cogeneration desalination technology, etc., which generally use negative pressure vacuum to reduce the evaporation temperature of seawater, and produce fresh water through continuous evaporation and condensation. The thermal desalination process water pump is the most important power equipment in the thermal desalination system. It not only directly provides the feed seawater required by the main evaporator of thermal desalination, but also pressurizes and supplies the desalinated water, seawater concentrate, and steam condensate produced by the main evaporator of thermal desalination. In the thermal desalination process, the process water pump generally uses a centrifugal pump. By preferentially starting the seawater booster pump and the concentrated seawater pump to establish seawater circulation, after the main evaporator of seawater desalination establishes vacuum negative pressure, steam is added to exchange heat with the feed seawater through the heat exchange tube, and the desalinated water, steam condensate and remaining seawater concentrate produced by seawater evaporation-steam condensation are pressurized and supplied to the outside through the fresh water pump, condensate pump and seawater concentrate pump. When the main evaporator of thermal desalination is operating normally, there is a negative pressure vacuum inside. The inlet pipe of the process water pump is connected to the water tank at the bottom of the desalination main body. The main evaporator and the connecting pipes are under negative pressure. The process water pump cavity and the connecting pipes cannot be filled with liquid due to negative pressure vacuum or leakage. The process water pump cannot be exhausted normally when starting and reversing the process water pump, resulting in the inability to supply the conveying medium (product desalinated water, brine, steam condensate) normally after the process water pump is started. The high liquid level alarm of the main evaporator of seawater desalination triggers a chain trip, which seriously affects the safe and stable operation of thermal desalination. Utility Model Content
[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related art.
[0004] To this end, the present disclosure provides a thermal seawater desalination process water pump exhaust pressure equalizing connection device, including a vacuum pumping device, a pressure equalizing pipeline and multiple process water pump groups, the vacuum pumping device is connected to the main evaporator through an exhaust pipe, the multiple process water pump groups have a liquid inlet end and a liquid outlet end, and the liquid inlet ends of the multiple process water pump groups are connected to the main evaporator through a main water inlet pipeline; the pressure equalizing pipeline is connected to the exhaust pipe and the liquid outlet ends of the multiple process water pump groups.
[0005] In a feasible implementation manner, the process water pump group includes a first process water pump group and a second process water pump group.
[0006] In a feasible embodiment, the first process water pump group includes a first process water pump, a first water inlet pipeline, a first water outlet pipeline and a first equalizing pressure pipe, a first switch valve is arranged on the first water inlet pipeline, and the first water inlet pipeline is connected between the first process water pump and the main water inlet pipeline, the first water outlet pipeline is connected between the main water outlet pipeline and the first water outlet pipeline, two ends of the first equalizing pressure pipe are respectively connected to the equalizing pressure pipeline and the first water outlet pipeline, and a first stop valve is arranged on the first equalizing pressure pipe.
[0007] In a feasible implementation manner, a pressure equalizing pipeline shut-off valve is provided on the pressure equalizing pipeline between the first pressure equalizing pipe and the air extraction pipe.
[0008] In a feasible embodiment, the second process water pump group includes a second process water pump, a second water inlet pipeline, a second water outlet pipeline and a second equalizing pressure pipe, a second switch valve is arranged on the second water inlet pipeline, and the second water inlet pipeline is connected between the second process water pump and the main water inlet pipeline, the second water outlet pipeline is connected between the main water outlet pipeline and the second water outlet pipeline, both ends of the second equalizing pressure pipe are respectively connected to the equalizing pressure pipeline and the second water outlet pipeline, and a second stop valve is arranged on the second equalizing pressure pipe.
[0009] In a feasible implementation manner, the liquid outlet ends of the first water outlet pipeline and the second water outlet pipeline are connected to the main water outlet pipeline of the process water pump.
[0010] In a feasible implementation manner, the first water outlet pipeline and the second water outlet pipeline are respectively provided with a pressure regulating valve.
[0011] In a feasible implementation manner, the pressure regulating valve is provided with a pneumatic regulating butterfly valve.
[0012] In a feasible implementation manner, the first switch valve is configured as an electric switch butterfly valve, and the first stop valve is configured as an electric stop valve.
[0013] In a feasible implementation manner, the second switch valve is configured as an electric switch butterfly valve, and the second stop valve is configured as an electric stop valve.
[0014] Compared with the prior art, the present disclosure includes at least the following beneficial effects: the present disclosure provides a thermal desalination process water pump exhaust pressure equalization connection device, including a vacuum pumping device, a pressure equalization pipeline and a plurality of process water pump groups, the vacuum pumping device is connected to the main evaporator through an air extraction pipe, the plurality of process water pump groups have a liquid inlet end and a liquid outlet end, and the liquid inlet ends of the plurality of process water pump groups are connected to the main evaporator through a main water inlet pipeline; the pressure equalization pipeline is connected to the air extraction pipe and the liquid outlet ends of the plurality of process water pump groups. The pressure equalization pipeline can prevent the negative pressure vacuum of the water inlet pipes of the plurality of process water pump groups from causing the cavity to be unable to be filled with liquid, resulting in no water discharge when the pump is started, prevent reverse pump operation failure and high liquid level shutdown of the main evaporator of thermal desalination, effectively protect the safe and stable operation of the process water pump, and can completely exhaust the air in the pump body and the connecting pipe through the vacuum ejector that maintains the negative pressure vacuum of the main evaporator, effectively improving the reliability of the reverse pump operation of the process water pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the exemplary embodiments below. The accompanying drawings are only for the purpose of illustrating exemplary embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0018] Figure 1 It is a schematic diagram of the structure of the present invention.
[0019] in, Figure 1 The correspondence between the reference numerals and the component names is as follows: 1-vacuum extraction device; 2-pressure equalizing pipeline; 21-pressure equalizing pipeline stop valve; 3-exhaust pipe; 4-main evaporator; 51-process water pump; 52-first water inlet pipeline; 53-first water outlet pipeline; 54-first pressure equalizing pipe; 55-first switch valve; 56-first stop valve; 62-second water inlet pipeline; 63-second water outlet pipeline; 64-second pressure equalizing pipe; 65-second switch valve; 66-second stop valve; 7-main water inlet pipeline; 8-main water outlet pipeline; 9-main water outlet pipeline of process water pump; 10-pressure regulating valve. DETAILED DESCRIPTION
[0020] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.
[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.
[0022] In the thermal desalination process, centrifugal pumps are generally used for process water pumps. Seawater circulation is established by first starting the seawater booster pump and the concentrated seawater pump. After the main evaporator of the desalination system establishes vacuum negative pressure, steam is added to exchange heat with the feed seawater through the heat exchange tube. The desalinated water, steam condensate and remaining seawater concentrated water generated by seawater evaporation and steam condensation are pressurized and supplied to the outside through the fresh water pump, condensate pump and seawater concentrated water pump. When the main evaporator of the thermal desalination system is operating normally, the inside is negative pressure vacuum. The inlet pipe of the process water pump is connected to the water tank at the bottom of the desalination system. The inside of the main evaporator and the connecting pipes are negative pressure. The process water pump cavity and the connecting pipes cannot be filled with liquid due to negative pressure vacuum or leakage. The process water pump cannot be exhausted normally when starting and reversing the pump, resulting in the inability to normally supply the conveying medium (product desalinated water, concentrated brine, steam condensate) after the process water pump is started, causing the high liquid level alarm of the main evaporator of the desalination system to trigger a chain trip, which seriously affects the safe and stable operation of the thermal desalination system.
[0023] Based on this, the embodiment of the present disclosure provides a thermal desalination process water pump exhaust pressure equalization connection device, including a vacuum pumping device, a pressure equalization pipeline and multiple process water pump groups, the vacuum pumping device is connected to the main evaporator through an air extraction pipe, the multiple process water pump groups have a liquid inlet end and a liquid outlet end, and the liquid inlet ends of the multiple process water pump groups are connected to the main evaporator through a main water inlet pipeline; the pressure equalization pipeline is connected to the air extraction pipe and the liquid outlet ends of the multiple process water pump groups. By implementing the technical solution of the present disclosure, the air in the connecting pipeline can be completely emptied, effectively improving the reliability of the reverse pump operation of the process water pump.
[0024] The following is a detailed description of the exhaust pressure equalization connection device of the thermal desalination process water pump through a specific embodiment:
[0025] Reference Figure 1As shown, the present disclosure provides a thermal seawater desalination process water pump exhaust pressure equalizing connection device, including a vacuum pumping device 1, a pressure equalizing pipeline 2 and a plurality of process water pump groups, the vacuum pumping device 1 is connected to a main evaporator 4 through an exhaust pipe 3, the plurality of process water pump groups have a liquid inlet end 100 and a liquid outlet end 200, and the liquid inlet ends 100 of the plurality of process water pump groups are connected to the main evaporator 4 through a main water inlet pipeline 7; the pressure equalizing pipeline 2 is connected to the exhaust pipe 3 and the liquid outlet ends 200 of the plurality of process water pump groups.
[0026] The present disclosure connects the equalizing pressure pipeline 2 with the steam extraction pipe 3 of the vacuum extraction device 1 of the main evaporator 4 of the thermal desalination system, so that the outlet side of multiple process water pump groups is vacuum negative pressure, and the inlet side of multiple process water pump groups and the outlet side of multiple process water pump groups are equalized. The process water pump and its connecting pipeline are full of liquid before starting the pump, which greatly improves the reliability and stability of the reverse pump operation of the process water pump. Specifically, as a device for realizing the vacuum extraction of the present disclosure, the vacuum extraction device 1 of the present disclosure includes mixed exhaust steam, a vacuum ejector and motive steam, wherein the mixed exhaust steam and the motive steam are connected to the vacuum ejector, and the vacuum ejector is connected to the exhaust pipe 3. The process water pump group of the present disclosure can be a plurality of process water pump groups arranged in parallel with pipelines. The embodiment of the present disclosure specifically divides the process water pump group into a first process water pump group and a second process water pump group to save space, and the number of process water pump groups can be adjusted according to demand in other use environments.
[0027] In some embodiments, the first process water pump group includes a process water pump 51, a first water inlet pipeline 52, a first water outlet pipeline 53 and a first equalizing pressure pipe 54, a first switch valve 55 is provided on the first water inlet pipeline 52, and the first water inlet pipeline 52 is connected between the first process water pump 51 and the main water inlet pipeline 7, the first water outlet pipeline 53 is connected between the main water outlet pipeline 8 and the first water outlet pipeline 53, the two ends of the first equalizing pressure pipe 54 are respectively connected to the equalizing pressure pipe 2 and the first water outlet pipe 53, and a first stop valve 56 is provided on the first equalizing pressure pipe 54.
[0028] In this embodiment, the first process water pump group includes a process water pump 51, a first water inlet pipeline 52, a first water outlet pipeline 53 and a first equalizing pressure pipe 54, wherein the first equalizing pressure pipe 54 is arranged as an independent pipeline to provide better accommodating space, making vacuuming more thorough and convenient.
[0029] In some embodiments, a pressure equalizing pipeline stop valve 21 is provided on the pressure equalizing pipeline 2 between the first pressure equalizing pipe 54 and the air extraction pipe 3 .
[0030] In this embodiment, a pressure equalizing pipeline stop valve 21 is provided on the pressure equalizing pipeline 2 between the first pressure equalizing pipe 54 and the exhaust pipe 3. That is, a main switch is provided on the pressure equalizing pipeline 2, and the stop valve 21 is used to stop the vacuuming of the pressure equalizing pipeline 2 to facilitate the maintenance of each process water pump.
[0031] In some embodiments, the second process water pump group includes a second process water pump 61, a second water inlet pipeline 62, a second water outlet pipeline 63 and a second pressure equalizing pipe 64, a second switch valve 65 is provided on the second water inlet pipeline 62, and the second water inlet pipeline 62 is connected between the second process water pump 61 and the main water inlet pipeline 7, the second water outlet pipeline 63 is connected between the main water outlet pipeline 8 and the second water outlet pipeline 63, the two ends of the second pressure equalizing pipe 64 are respectively connected to the pressure equalizing pipe 2 and the second water outlet pipe 63, and a second stop valve 66 is provided on the second pressure equalizing pipe 64. The specific structure of the second water pump group is the same as that of the first process water pump group.
[0032] In some embodiments, the liquid outlet ends of the first water outlet pipeline 53 and the second water outlet pipeline 63 are connected to the main water outlet pipeline 9 of the process water pump.
[0033] In this embodiment, by providing a process water pump main outlet pipeline 9, the first outlet pipelines 53 and the second outlet pipelines 63 of the two process water pumps are integrated into one main pipeline, so as to reduce the number of equipment and improve the stability of the present disclosure.
[0034] In some embodiments, the first water outlet pipeline 53 and the second water outlet pipeline 63 are respectively provided with a pressure regulating valve 10. The pressure regulating valve 10 of the present disclosure can adjust the flow of the first water outlet pipeline 53 and the second water outlet pipeline 63 to improve the fine control effect. Specifically, the pressure regulating valve 10 of the present disclosure can be provided with a pneumatic regulating butterfly valve.
[0035] In some embodiments, the first switch valve 55 is configured as an electric switch butterfly valve, and the first stop valve 56 is configured as an electric stop valve to facilitate automatic control.
[0036] In some embodiments, the second switch valve 65 is configured as an electric switch butterfly valve, and the second stop valve 66 is configured as an electric stop valve.
[0037] During use, after the vacuum is established in the main evaporator 4, the inside of the main evaporator 4 and the connecting pipelines are at negative pressure. Taking the first process water pump group as an example, before the process water pump 51 is started, the first switch valve 55, the first stop valve 56, and the pressure-equalizing pipeline stop valve 21 are opened to make the first water outlet pipeline 53 and the first water outlet pipeline 53 of the process water pump 51 realize equal pressure. The medium level of the water tank at the bottom of the main evaporator 4 is higher than that of the process water pump 51. The conveying medium fills the process water pump 51 and the first water outlet pipeline 53 and the first water outlet pipeline 53. After closing the first stop valve 56 and the pressure-equalizing pipeline stop valve 21, the process water pump can be started, so that the pump body and the inlet and outlet pipelines are full of liquid before the process water pump is started.
[0038] After the vacuum is established in the main evaporator 4, the main evaporator 4 and the connecting pipelines are under negative pressure. When the process water pump is operated in reverse (taking the first process water pump 51 as an example to operate the second process water pump 62 in reverse), the second switch valve 65, the pressure-equalizing pipeline stop valve 21, and the second stop valve 66 are opened, and the water inlet and outlet pipes of the second process water pump 62 are pressure-equalized. At the same time, the air in the process water pump body and the inlet and outlet pipes can be extracted through the vacuum pump 1, so that the pump body and the inlet and outlet pipes are exhausted and filled with liquid before the process water pump is started. By setting the pressure-equalizing exhaust pipe, not only the starting and operating conditions of the process water pump are improved, but also the exhaust time before the process water pump is started and the reliability of the process water pump start-up are greatly shortened.
[0039] Finally, it should be explained that the device of the present invention adopts a jet-type vacuum ejector to maintain the main vacuum negative pressure. The valves of the process water pump inlet and outlet pipes are three-eccentric metal hard-sealed butterfly valves. The inlet valve is an electric switch valve, and the outlet valve is a pneumatic regulating valve. The device of the present invention connects the exhaust pipe of the process water pump and the inlet pipe of the process water pump to the desalination main device to achieve pressure equalization. The exhaust pipe point is selected from the highest position of the process water pump outlet pipe, and the pipe diameter is Φ50mm. A stop valve is respectively installed on the exhaust pipe and the exhaust main pipe of the process water pump of the device of the present invention. The outlet pipe of the process water pump and the exhaust pipe are connected to the main evaporator vacuum ejector steam extraction pipe through the exhaust main pipe.
[0040] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.
[0041] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.
[0042] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0043] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.
Claims
1. A thermal desalination process water pump exhaust pressure equalization connection device, characterized in that: It includes a vacuum pumping device, a pressure equalizing pipeline and a plurality of process water pump groups, wherein the vacuum pumping device is connected to the main evaporator through an exhaust pipe, wherein: The plurality of process water pump groups have a liquid inlet end and a liquid outlet end, and the liquid inlet ends of the plurality of process water pump groups are connected to the main evaporator through a main water inlet pipeline; The pressure equalizing pipeline is connected to the air extraction pipe and the liquid outlet ends of the plurality of process water pump groups.
2. The exhaust pressure equalization connection device for a thermal seawater desalination process water pump according to claim 1, characterized in that: The process water pump group includes a first process water pump group and a second process water pump group.
3. The exhaust pressure equalization connection device for a thermal seawater desalination process water pump according to claim 2, characterized in that: The first process water pump group includes a first process water pump, a first water inlet pipeline, a first water outlet pipeline and a first equalizing pressure pipe. The first water inlet pipeline is provided with a first switch valve, and the first water inlet pipeline is connected between the first process water pump and the main water inlet pipeline, the first water outlet pipeline is connected between the main water outlet pipeline and the first water outlet pipeline, both ends of the first equalizing pressure pipe are respectively connected to the equalizing pressure pipeline and the first water outlet pipeline, and the first equalizing pressure pipe is provided with a first stop valve.
4. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 3, characterized in that: A pressure equalizing pipeline stop valve is arranged on the pressure equalizing pipeline between the first pressure equalizing pipe and the air extraction pipe.
5. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 3, characterized in that: The second process water pump group includes a second process water pump, a second water inlet pipeline, a second water outlet pipeline and a second equalizing pressure pipe. A second switch valve is arranged on the second water inlet pipeline, and the second water inlet pipeline is connected between the second process water pump and the main water inlet pipeline, the second water outlet pipeline is connected between the main water outlet pipeline and the second water outlet pipeline, both ends of the second equalizing pressure pipe are respectively connected to the equalizing pressure pipeline and the second water outlet pipeline, and a second stop valve is arranged on the second equalizing pressure pipe.
6. The exhaust pressure equalization connection device for a water pump in a thermal desalination process according to claim 5, characterized in that: The liquid outlet ends of the first water outlet pipeline and the second water outlet pipeline are connected to the main water outlet pipeline of the process water pump.
7. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 5, characterized in that: The first water outlet pipeline and the second water outlet pipeline are respectively provided with a pressure regulating valve.
8. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 7, characterized in that: The pressure regulating valve is provided with a pneumatic regulating butterfly valve.
9. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 3, characterized in that: The first switch valve is configured as an electric switch butterfly valve, and the first stop valve is configured as an electric stop valve.
10. The exhaust pressure equalization connection device for a water pump in a thermal seawater desalination process according to claim 5, characterized in that: The second switch valve is configured as an electric switch butterfly valve, and the second stop valve is configured as an electric stop valve.