Steam generator multi-machine parallel water supply system and water supply method

Abstract

The application belongs to the field of steam generation, and particularly discloses a steam generator multi-machine parallel water supply system and a water supply method, wherein the steam generator multi-machine parallel water supply system comprises a water supply pipeline group, a pump group, an adjusting mechanism and a control mechanism, the water supply pipeline group comprises a main pipe and a plurality of branch pipes in communication with the main pipe, the main pipe is in communication with the pump group, and the plurality of branch pipes are respectively used for supplying water to a plurality of steam generators; the adjusting mechanism comprises a plurality of water storage tanks corresponding to the branch pipes one by one and water amount detection pieces installed in the water storage tanks, the water storage tanks are provided with water inlet pipes, first water outlet pipes and second water outlet pipes in communication, the water inlet pipes and the first water outlet pipes are in communication with the corresponding branch pipes, and the second water outlet pipes are in communication with the remaining water storage tanks; and the control mechanism comprises a controller. The scheme can solve the problems of steam generator pipeline resistance and pressure influence at the near-pump end and the far-pump end.

Description

Technical Field

[0001] This invention belongs to the field of steam generation, specifically relating to a multi-unit parallel water supply system for steam generators and a water supply method. Background Technology

[0002] In industrial steam production systems, multiple steam generators (such as boilers) are typically configured to operate in parallel to meet different load demands and improve system reliability. The multiple steam generators are connected to the water pump unit through a water supply header, and the water pump unit supplies water to each boiler in a unified manner. The stability of the water supply system directly affects the accuracy of boiler water level control, the safety of boiler operation, and the energy efficiency of the entire steam system.

[0003] According to fluid mechanics principles, the flow distribution in each branch depends on the pipe resistance characteristics: branches with lower resistance receive more flow, while branches with higher resistance receive less flow. Pipe resistance is affected by factors such as pipe length and the number of bends. Therefore, the further a steam generator is from the pump unit, the greater its pipe resistance, while the closer a steam generator is to the pump unit, the lower its pipe resistance. This leads to a situation where, when multiple steam generators require water replenishment simultaneously, the steam generators closer to the pump supply an excess of water, while those farther from the pump supply an insufficient amount—a "water-grabbing" problem. This water-grabbing problem may worsen over long-term operation.

[0004] Simultaneously, during the initial startup of the steam generator and water pump unit, there is a time required for water to flow into the steam generator. During this process, the pipeline will be under negative pressure. The steam generator near the pump end has a faster water replenishment rate, resulting in less impact on pipeline pressure, while the steam generator far from the pump end has a slower water replenishment rate, resulting in a greater impact on pipeline pressure. Similarly, when shutting down the steam generator and water pump unit, there is also a time required for water delivery to completely stop. During this process, the inertia of the water flow will cause the pipeline to be under pressurized. The pipeline path near the pump end is shorter and has less inertia, while the pipeline path far from the pump end is longer and has greater inertia, both of which will affect pipeline pressure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-unit parallel water supply system and method for steam generators, in order to solve the problems of pipeline resistance and pressure effects at the near and far pump ends of the steam generators.

[0006] According to embodiments of the present invention, the present invention adopts the following technical solution:

[0007] A multi-unit parallel water supply system for steam generators includes a water supply pipeline group, a pump group, a regulating mechanism, and a control mechanism. The water supply pipeline group includes a main pipe and several branch pipes connected to the main pipe. The main pipe is connected to the pump group, and the multiple branch pipes are used to supply water to multiple steam generators respectively. The regulating mechanism includes several water storage tanks, each corresponding to a branch pipe, and water level detection devices installed in the water storage tanks. The water storage tanks are connected to an inlet pipe, a first outlet pipe, and a second outlet pipe. The inlet pipe and the first outlet pipe are both connected to their corresponding branch pipes. An inlet valve is installed in the inlet pipe, allowing water to flow into the water storage tank in one direction. A first outlet valve is installed in the first outlet pipe, allowing water to flow out of the water storage tank in one direction. The second outlet pipe is connected to the remaining water storage tanks and contains a second outlet valve. The control mechanism includes a controller. The controller's signal receiving end receives the detection signal from the water level detection devices, and the controller's signal output end controls the opening and closing of the second outlet valves based on the detection signal from the water level detection devices.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. Connect a water storage tank to the branch pipe. The water storage tank is close to the steam generator. When the water flow in the branch pipe is insufficient or excessive, the water in the water storage tank can be used to replenish the branch pipe or the excess water in the branch pipe can flow into the water storage tank, reducing the impact of the near-pump end and the far-pump end on the water flow.

[0010] Meanwhile, when the steam generator and pump set start and stop, if the branch pipe is under pressurized, water can be discharged into the water storage tank to reduce the pressure. If the branch pipe is under negative pressure, water from the water storage tank can be added into the branch pipe to increase the pressure and reduce the impact of pressure changes on the branch pipe.

[0011] 2. When all steam generators have the same water supply demand, the water supply of the steam generator near the pump end is always greater than that of the steam generator far from the pump end. As a result, the water in the storage tank near the pump end is always more than that in the storage tank far from the pump end. This may lead to insufficient water storage in the storage tank far from the pump end when water needs to be added to the branch pipe.

[0012] In this application, the water volume in the storage tank is detected. When the water volume in the storage tank is large, the water in the storage tank can be discharged into other storage tanks with insufficient water volume through the second outlet pipe, so as to ensure that the water volume in each storage tank can meet the water replenishment needs of its corresponding branch pipe.

[0013] Furthermore, a flow regulating valve is installed inside the branch pipe, and the inlet pipe and the first outlet pipe are both connected upstream of the flow regulating valve.

[0014] Furthermore, a flow detection device is installed inside the branch pipe. The inlet pipe and the first outlet pipe are both connected between the flow detection device and the flow regulating valve. The flow detection device is located on the side closer to the main pipe. The signal receiving end of the controller is used to receive the detection signal from the flow detection device, and the signal output end of the controller is used to control the operation of the pump group according to the detection signal from the flow detection device.

[0015] Furthermore, a branch valve is installed at the end of the branch pipe closest to the main pipe.

[0016] Furthermore, a hydraulic testing device for detecting water pressure inside the branch pipe is installed inside the branch pipe.

[0017] Furthermore, a pressure detection device for detecting the air pressure inside the water storage tank is installed inside the tank; a pressure valve is installed on the water storage tank.

[0018] According to embodiments of the present invention, the present invention also employs the following technical solutions:

[0019] The method for parallel water supply of multiple steam generators includes the following setup steps:

[0020] S1. When all steam generators are operating synchronously, measure the water flow rate in each branch pipe and calculate the flow rate ratio.

[0021] S2. Set the water storage threshold of the water tank corresponding to the branch pipe according to the flow rate ratio. The flow rate ratio of the branch pipe and the water storage threshold ratio of the corresponding water tank are inversely proportional.

[0022] S3. When the liquid level in the water storage tank reaches the set water storage threshold, the water in the water storage tank is discharged through the second water outlet pipe to other water storage tanks that have not reached the set water storage threshold.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. If the water supply from the steam generator near the pump end is consistently greater than that from the pump end, the water in the storage tank near the pump end will consistently be more than that in the storage tank at the pump end. By detecting the liquid level in the storage tank, when the liquid level in the storage tank is high, the water in that storage tank can be discharged through the second outlet pipe into other storage tanks with insufficient liquid levels, ensuring that the water storage in each storage tank can meet the water replenishment needs of its corresponding branch pipe.

[0025] 2. When the steam generator and pump set start and stop, the pressure change of the branch pipe near the pump end has little impact, and the water replenishment demand is also lower than that of the far pump end. Therefore, the water storage capacity demand of the storage tank is low. If the water storage capacity threshold of all storage tanks is set in the same way, there will still be a situation where the water storage capacity in the storage tank near the pump end is excessive, while the water storage capacity in the storage tank at the far pump end is still insufficient even after replenishment.

[0026] Therefore, during the initial setup, the flow rate ratio of the branch pipe is set to be inversely proportional to the corresponding water storage tank threshold ratio, thereby reducing the water storage in the water tank near the pump end. Excess water is then added to the water tank at the far pump end, further ensuring that the water storage in each water tank can meet the water supply needs of its corresponding branch pipe.

[0027] In addition, this application sets the water storage capacity threshold of the storage tank according to the flow rate ratio of the branch pipe, rather than relying solely on the distance from the pump set, thereby reducing the influence of internal pipe resistance and improving the setting accuracy.

[0028] Furthermore, when the steam generator is started, the water in the storage tank enters the branch pipe through the first outlet pipe; when the steam generator is shut down, the water in the branch pipe enters the storage tank through the inlet pipe.

[0029] Furthermore, when the pump set is running at a constant speed, when the water supply required by the steam generator is greater than the water flow rate in the branch pipe, the water in the storage tank enters the branch pipe through the first outlet pipe; when the water supply required by the steam generator is less than the water flow rate in the branch pipe, the water in the branch pipe enters the storage tank through the inlet pipe.

[0030] Furthermore, when the water supply required by all steam generators is greater than the water flow rate in the branch pipes, the pump speed is increased; when the water supply required by all steam generators is less than the water flow rate in the branch pipes, the pump speed is decreased. Attached Figure Description

[0031] Figure 1 This is a top view of the overall structure of an embodiment of the present invention.

[0032] Figure 2 for Figure 1 Front view of the central water storage tank and branch pipes.

[0033] In the diagram: 1. Pump set; 2. Main pipe; 3. Branch pipe; 4. Branch valve; 5. Steam generator; 6. Water storage tank; 7. First outlet pipe; 8. First outlet valve; 9. Inlet pipe; 10. Inlet valve; 11. Flow detection device; 12. Flow regulating valve; 13. Second outlet pipe; 14. Drive pump; 15. Second outlet valve. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings, and specific embodiments are given.

[0035] In a first aspect, embodiments of the present invention disclose a multi-generator parallel water supply system for steam generators, specifically including the following embodiments:

[0036] like Figure 1As shown, the multi-unit parallel water supply system for steam generators includes a water supply pipeline group, a pump group 1, a regulating mechanism, and a control mechanism. The pump group 1 is used to provide water supply power and can be designed with reference to the design of water pump units in the prior art. The water supply pipeline group is used to transport water from the water source to the steam generator 5. Specifically, the water supply pipeline group includes a main pipe 2 and several branch pipes 3 connected to the main pipe 2. The main pipe 2 is connected to the pump group 1, and the multiple branch pipes 3 are used to supply water to multiple steam generators 5 respectively.

[0037] In this embodiment, Figure 1 Taking the two parallel steam generators 5 shown as an example, when the pump group 1 is placed in the middle, the distance between the pump group 1 and the two steam generators 5 is basically the same. If the branch pipes 3 are also designed in the same way, the water supply of the two steam generators 5 can be kept basically the same, and there is no difference between the near pump end and the far pump end. Therefore, in this embodiment, taking the pump group 1 placed near the left steam generator 5 as an example, the left steam generator 5 is at the near pump end, and the right steam generator 5 is at the far pump end. When the number of steam generators 5 exceeds two, there will be a near pump end and a far pump end regardless of whether the pump group 1 is placed in the middle position, and the design can be adjusted according to the requirements.

[0038] A branch valve 4 is installed at the end of the branch pipe 3 near the main pipe 2. The branch valve 4 can be a common valve used in water pipes in the existing technology. When the steam generator 5 of the corresponding branch pipe 3 is not started, the branch valve 4 in the branch pipe 3 can be closed. With this design, the required steam generator 5 can be selected according to the needs.

[0039] A hydraulic pressure sensor is installed inside branch pipe 3 to detect the water pressure within it. Specifically, the hydraulic pressure sensor uses a conventional pressure transmitter, and when used in water, a corrosion-resistant model must be selected. By detecting the water pressure inside branch pipe 3, operators can easily determine the water flow status.

[0040] A flow regulating valve 12 is installed in the branch pipe 3. The inlet pipe 9 and the first outlet pipe 7 are both connected upstream of the flow regulating valve 12. Specifically, the flow regulating valve 12 is an electric ball valve or an electric butterfly valve, which can regulate the flow in the branch pipe 3. It can be designed according to the water supply required by the steam generator 5.

[0041] The regulating mechanism includes several water storage tanks 6, each corresponding to a branch pipe 3, and water level detection devices installed in the water storage tanks 6. Specifically, the water level detection devices can be conventional hydrostatic level sensors or ultrasonic level sensors, etc. Once the shape and size of the water storage tanks 6 are determined, it is sufficient to detect the liquid level in the water storage tanks 6. By detecting the liquid level in the water storage tanks 6, the amount of water stored in the water storage tanks 6 can be determined.

[0042] The water storage tank 6 is connected to an inlet pipe 9, a first outlet pipe 7, and a second outlet pipe 13. Both the inlet pipe 9 and the first outlet pipe 7 are connected to their corresponding branch pipes 3. An inlet valve 10 is installed in the inlet pipe 9 to supply water into the water storage tank 6 in one direction. A first outlet valve 8 is installed in the first outlet pipe 7 to supply water out of the water storage tank 6 in one direction. Both the inlet valve 10 and the first outlet valve 8 are one-way valves in the prior art. The one-way valve can be opened when the positive pressure received is greater than the reverse pressure, so the pressure in the water storage tank 6 remains constant. When the branch pipe 3 is under negative pressure, the first outlet valve 8 is opened, and the water in the water storage tank 6 enters the branch pipe 3 through the first outlet pipe 7. When the branch pipe 3 is under pressurized, the inlet valve 10 is opened, and the water in the branch pipe 3 enters the water storage tank 6 through the inlet pipe 9.

[0043] In actual design, combined with Figure 2 As shown, in order to ensure smooth water flow in the inlet pipe 9 and the first outlet pipe 7, both the inlet pipe 9 and the first outlet pipe 7 can be set at an angle, just slightly. The end of the inlet pipe 9 closest to the branch pipe 3 is its high end, and the end of the first outlet pipe 7 closest to the branch pipe 3 is its low end.

[0044] The second outlet pipe 13 is connected to the other water storage tanks 6. A second outlet valve 15 is installed inside the second outlet pipe 13. In this embodiment, since there are only two water storage tanks 6, the second outlet pipes 13 on the two water storage tanks 6 are interconnected. That is, the second outlet pipe 13 on the right water storage tank 6 will rotate and connect to the left water storage tank 6. The two second outlet pipes 13 are used to introduce water into the other water storage tank 6 respectively. In actual design, when there are many water storage tanks 6, multiple water storage tanks 6 can be connected in series through the second outlet pipe 13 on each water storage tank 6. When connecting in series, start from the one closest to the pump group 1 and connect them sequentially in the direction away from the pump group 1. Finally, connect the second outlet pipe 13 on the water storage tank 6 farthest from the pump group 1 back to the water storage tank 6 closest to the pump group 1. In order to facilitate the flow of water in the second outlet pipe 13, a drive pump 14 is connected to each of the second outlet pipes 13 to provide water flow power.

[0045] The water storage tank 6 is equipped with a pressure detection device for detecting the air pressure inside the water storage tank 6. The pressure detection device uses a conventional pressure transmitter in the existing technology. By detecting the air pressure inside the water storage tank 6, the water storage tank 6 is kept at a constant pressure. When the air pressure detected by the pressure detection device is obviously high or low, the staff needs to intervene.

[0046] A pressure valve is installed on the water storage tank 6. Specifically, the water storage tank 6 has a vent hole, and the pressure valve is installed inside the vent hole. The pressure valve is a conventional breather valve used in existing technology, which allows the water storage tank 6 to communicate with the outside world and to release or replenish gas when there is overpressure or low pressure inside the water storage tank 6. In actual design, the vent hole of the water storage tank 6 can be directly connected to the atmosphere. Of course, to ensure the cleanliness of the gas source, a gas source (such as an air compressor) can also be connected to the vent hole.

[0047] The control mechanism includes a controller. The controller's signal receiving end is used to receive the detection signal from the water level detection device, and the controller's signal output end is used to control the opening and closing of the second water outlet valve 15 according to the detection signal from the water level detection device. Specifically, the controller uses a microcontroller or a controller controlled by a PLC program, which are both existing technologies. When the liquid level in the water storage tank 6 is high enough to reach the set threshold of the water level detection device, the controller controls the second water outlet valve 15 in the second water outlet pipe 13 on the water storage tank 6 to open, and controls the drive pump 14 connected to the second water outlet pipe 13 to start, so that the water in the water storage tank 6 can be discharged into the other water storage tanks 6 through the second water outlet pipe 13.

[0048] In practical use, when the two steam generators 5 start synchronously, the branch valves 4 in both branch pipes 3 are opened. In actual design, the opening and closing of the branch valves 4 can also be controlled by the controller. The pump set 1 is started, and the pump set 1 drives the water flow into the main pipe 2. The water flow is split at the branch pipe 3 and flows into the two steam generators 5 respectively.

[0049] When the water supply demand set by the two steam generators 5 is the same, that is, the opening degree of the flow regulating valves 12 on both sides is the same, the speed of the pump group 1 is set according to the required water flow. However, in actual application, the total length of the pipe between the left steam generator 5 and the pump group 1 is short and the resistance inside the pipe is small, so the water flow entering it is greater than the water flow entering the right branch pipe 3. So even if the speed of the pump group 1 is set, the following situations will occur: (1) the water flow in the right branch pipe 3 just meets the water supply demand of its steam generator 5, and the water flow in the left branch pipe 3 is excessive; (2) the water flow in the right branch pipe 3 is slightly insufficient, and the water flow in the left branch pipe 3 just meets the demand or is slightly excessive. When the water flow on both sides is excessive or insufficient, the speed of the pump group 1 needs to be readjusted.

[0050] Excess water flow in branch pipe 3 is obstructed at flow regulating valve 12, increasing water pressure there. When the water pressure exceeds the pressure in inlet pipe 9, the water, affected by the pressure difference between branch pipe 3 and inlet pipe 9, enters inlet pipe 9 connected to branch pipe 3 and then into storage tank 6. Taking the above situation (1) as an example, water in left branch pipe 3 enters left storage tank 6. When the liquid level in left storage tank 6 reaches the set threshold of water volume detection device, water in left storage tank 6 enters right storage tank 6 through second outlet pipe 13 (driven by drive pump 14). When the above situation (2) occurs later, the water flow in right branch pipe 3 is insufficient, but the opening of flow regulating valve 12 is large, allowing water to flow quickly and unobstructed. Due to insufficient water flow, negative pressure is generated in the subsequent water flow. At this time, water in right storage tank 6 can enter branch pipe 3 through first outlet pipe 7 (driven by pressure difference) to replenish it.

[0051] When the water supply demand set by the two steam generators 5 is inconsistent, that is, the opening degree of the flow regulating valves 12 on both sides is inconsistent, the speed of the pump group 1 is adjusted according to the water flow rate of the side with higher water supply demand, and the excess water flow in the branch pipe 3 on the side with lower water supply demand enters the water storage tank 6 for storage.

[0052] In another embodiment of the present invention, a flow detection element 11 is installed in the branch pipe 3. The flow detection element 11 is a conventional flow meter in the prior art. The inlet pipe 9 and the first outlet pipe 7 are both connected between the flow detection element 11 and the flow regulating valve 12. The flow detection element 11 is located on the side closer to the main pipe 2. The flow detection element 11 detects the water flow in the branch pipe 3. According to the set pump speed 1, the water flow should be within a certain range. When the water flow is significantly too high or too low, there may be problems such as pipe leakage or blockage, requiring personnel to intervene for inspection. In addition, by detecting the water flow in the branch pipe 3, it is also convenient for personnel to determine whether the water flow in the branch pipe 3 is excessive or insufficient.

[0053] The controller's signal receiving end is used to receive the detection signal from the flow detection element 11, and the controller's signal output end is used to control the operation of the pump group 1 according to the detection signal from the flow detection element 11. Specifically, when the water flow in both branch pipes 3 is excessive or insufficient, the controller controls the readjustment of the pump group 1 speed. When the water supply required by all steam generators 5 is greater than the water flow in the branch pipes 3, the speed of the pump group 1 is increased; when the water supply required by all steam generators 5 is less than the water flow in the branch pipes 3, the speed of the pump group 1 is decreased.

[0054] Secondly, embodiments of the present invention disclose a method for parallel water supply of multiple steam generators, specifically including the following embodiments:

[0055] The method for parallel water supply of multiple steam generators includes the following setup steps:

[0056] S1. When all steam generators 5 are operating synchronously, and the required water supply for all steam generators 5 is set to be consistent, or the flow regulating valves 12 can be set to be fully open. Measure the water flow rate in each branch pipe 3 and calculate the flow rate ratio. Here, it is assumed that the flow rate ratio between the left branch pipe 3 and the right branch pipe 3 is 1:0.9.

[0057] S2. Set the water storage threshold of the water storage tank 6 corresponding to the branch pipe 3 according to the flow ratio. The flow ratio of the branch pipe 3 and the water storage threshold ratio of the corresponding water storage tank 6 are inversely proportional. That is, the water storage threshold of the left water storage tank 6 and the right water storage tank 6 are set to 0.9:1.

[0058] S3. When the liquid level in storage tank 6 reaches the set water storage threshold, the water in storage tank 6 is discharged through the second outlet pipe 13 to other storage tanks 6 that have not reached the set water storage threshold. That is, assuming that the two storage tanks 6 are the same in shape and size, when the liquid level in the left storage tank 6 reaches 0.9m, the water in the left storage tank 6 can be discharged through the second outlet pipe 13, while the liquid level in the right storage tank 6 must reach 1m before the water in the right storage tank 6 can be discharged through the second outlet pipe 13. This reduces the water storage in the storage tank 6 near the pump end, and the excess water is replenished to the storage tank 6 far from the pump end, further ensuring that the water storage in each storage tank 6 can meet the water replenishment needs of its corresponding branch pipe 3.

[0059] In another embodiment of the present invention, when the steam generator 5 is started, the pump group 1 starts synchronously, but it takes time for water to flow into the steam generator 5. At this time, the branch pipe 3 is under negative pressure, and the water in the water storage tank 6 enters the branch pipe 3 through the first water outlet pipe 7.

[0060] When the steam generator 5 is shut down, the pump set 1 is shut down simultaneously. Or, when only one or several steam generators 5 are shut down, only the corresponding branch valve 4 is closed. Regardless of whether the pump set 1 is shut down or the branch valve 4 is closed, the water will still flow to the steam generator 5 during this period, but it can no longer be discharged. At this time, the branch pipe 3 is pressurized, and the water in the branch pipe 3 enters the water storage tank 6 through the water inlet pipe 9.

[0061] When pump unit 1 is running at a constant speed, if the water supply required by steam generator 5 is greater than the water flow rate in branch pipe 3, the section of branch pipe 3 near steam generator 5 is under negative pressure, and water in storage tank 6 enters branch pipe 3 through first outlet pipe 7. If the water supply required by steam generator 5 is less than the water flow rate in branch pipe 3, the section of branch pipe 3 near steam generator 5 is under pressurized, and water in branch pipe 3 enters storage tank 6 through inlet pipe 9.

[0062] The above methods all involve water flow driven by pressure difference. However, in practical applications, pumps can be installed on both the inlet pipe 9 and the first outlet pipe 7 to drive the water flow, instead of relying solely on pressure difference.

[0063] When the water supply required by all steam generators 5 is greater than the water flow rate in branch pipes 3, that is, when the water volume in all branch pipes 3 is insufficient, increase the speed of pump set 1. When the water supply required by all steam generators 5 is less than the water flow rate in branch pipes 3, that is, when the water volume in all branch pipes 3 is excessive, decrease the speed of pump set 1.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-unit parallel water supply system for steam generators, characterized in that, The system includes a water supply pipeline assembly, a pump assembly, a regulating mechanism, and a control mechanism. The water supply pipeline assembly includes a main pipe and several branch pipes connected to the main pipe. The main pipe is connected to the pump assembly, and the multiple branch pipes are used to supply water to multiple steam generators. The regulating mechanism includes several water storage tanks, each corresponding to a branch pipe, and water level detection devices installed in the water storage tanks. Each water storage tank is connected to an inlet pipe, a first outlet pipe, and a second outlet pipe. The inlet pipe and the first outlet pipe are both connected to their corresponding branch pipes. An inlet valve is installed in the inlet pipe, allowing water to flow into the water storage tank in one direction. A first outlet valve is installed in the first outlet pipe, allowing water to flow out of the water storage tank in one direction. The second outlet pipe is connected to the remaining water storage tanks and contains a second outlet valve. The control mechanism includes a controller. The controller's signal receiving end receives the detection signal from the water level detection devices, and the controller's signal output end controls the opening and closing of the second outlet valve based on the detection signal from the water level detection devices.

2. The multi-unit parallel water supply system for steam generators according to claim 1, characterized in that, A flow regulating valve is installed inside the branch pipe, and the inlet pipe and the first outlet pipe are both connected upstream of the flow regulating valve.

3. The multi-unit parallel water supply system for steam generators according to claim 2, characterized in that, A flow detection device is installed inside the branch pipe. The inlet pipe and the first outlet pipe are both connected between the flow detection device and the flow regulating valve. The flow detection device is located on the side closer to the main pipe. The signal receiving end of the controller is used to receive the detection signal from the flow detection device, and the signal output end of the controller is used to control the operation of the pump group according to the detection signal from the flow detection device.

4. The multi-unit parallel water supply system for steam generators according to claim 1, characterized in that, A branch valve is installed at the end of the branch pipe closest to the main pipe.

5. The multi-unit parallel water supply system for steam generators according to claim 1, characterized in that, The branch pipe is equipped with a hydraulic detection device for detecting the water pressure inside the branch pipe.

6. The multi-unit parallel water supply system for steam generators according to claim 1, characterized in that, The water storage tank is equipped with a pressure detection device for detecting the air pressure inside the tank; a pressure valve is also installed on the water storage tank.

7. A method for parallel water supply of multiple steam generators, characterized in that, The setup steps include the following: S1. When all steam generators are operating synchronously, measure the water flow rate in each branch pipe and calculate the flow rate ratio. S2. Set the water storage threshold of the water tank corresponding to the branch pipe according to the flow rate ratio. The flow rate ratio of the branch pipe and the water storage threshold ratio of the corresponding water tank are inversely proportional. S3. When the liquid level in the water storage tank reaches the set water storage threshold, the water in the water storage tank is discharged through the second water outlet pipe to other water storage tanks that have not reached the set water storage threshold.

8. The method for parallel water supply of multiple steam generators according to claim 7, characterized in that, When the steam generator is started, water in the storage tank enters the branch pipe through the first outlet pipe; when the steam generator is shut down, water in the branch pipe enters the storage tank through the inlet pipe.

9. The method for parallel water supply of multiple steam generators according to claim 7, characterized in that, When the pump set is running at a constant speed, if the water supply required by the steam generator is greater than the water flow rate in the branch pipe, the water in the storage tank enters the branch pipe through the first outlet pipe; if the water supply required by the steam generator is less than the water flow rate in the branch pipe, the water in the branch pipe enters the storage tank through the inlet pipe.

10. The method for parallel water supply of multiple steam generators according to claim 7, characterized in that, When the water supply required by all steam generators is greater than the water flow in the branch pipe, increase the pump speed; when the water supply required by all steam generators is less than the water flow in the branch pipe, decrease the pump speed.

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