A slow pressure supply system for seawater desalination reverse osmosis membrane elements

Abstract

The utility model discloses a slow-pressure supply system for a seawater desalination reverse osmosis membrane element, comprising a host computer, a high-pressure pump and an electric discharge ball valve, wherein the high-pressure pump comprises a high-pressure pump coupling end, a high-pressure pump water inlet, a high-pressure pump body, a high-pressure pump water outlet and a balancing plate, wherein the high-pressure pump water inlet is arranged at the front end of the high-pressure pump body, the high-pressure pump water outlet is arranged at the rear end of the high-pressure pump body, the balancing plate is arranged at the non-driving end of the high-pressure pump body, the non-driving end of the high-pressure pump is connected to the electric discharge ball valve through a discharge pressure guiding pipeline, thereby ensuring that no pressure shock of a reverse osmosis membrane group is generated, and avoiding damage caused by friction of the balancing plate when the high-pressure pump is operated at a speed below 1500r / min, thereby improving the service life of the high-pressure pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of seawater desalination, and in particular relates to a slow-pressure supply system for a seawater desalination reverse osmosis membrane element. Background Art

[0002] In seawater desalination projects, due to the particularity of reverse osmosis membrane elements, if they are subjected to instantaneous pressure shocks, the membrane elements will suffer mechanical damage such as telescopes, which will damage the performance of the membrane elements. Therefore, during the start-up and shutdown of the membrane group, it is necessary to slowly increase or reduce the pressure to avoid instantaneous pressure shocks or pressure loss. In double-membrane seawater desalination, multi-stage high-pressure pumps are often used to provide high pressure to the reverse osmosis membrane group, driving the fresh water in the seawater through the reverse osmosis membrane to achieve the purpose of producing fresh water. Commonly used high-pressure pumps are mainly multi-stage high-pressure pumps. Most of the multi-stage high-pressure pumps use positive and negative balance disc devices to reduce the pressure shock in the pump chamber. However, the positive and negative balance discs will produce friction and damage during low speeds. Therefore, multi-stage high-pressure pumps are generally not allowed to run below 1500r / min for a long time to avoid affecting the service life of the high-pressure pump. This is in conflict with the use of reverse osmosis membrane elements. To address this problem, the conventional solution in the prior art is to start the high-pressure pump under the premise of closing the high-pressure pump outlet valve, and when it reaches 1500r / min, open the high-pressure pump outlet valve. However, at this time, the pump outlet pressure will increase instantly, which cannot be used in seawater desalination reverse osmosis membrane groups. Utility Model Content

[0003] In order to overcome the above-mentioned technical problems existing in the prior art, the purpose of the utility model is to provide a slow-pressure supply system for seawater desalination reverse osmosis membrane elements, which ensures that no pressure shock of the reverse osmosis membrane group is generated, and at the same time, when the high-pressure pump is running at a speed below 1500r / min, avoids damage caused by friction of the balance disk, thereby increasing the service life of the high-pressure pump.

[0004] The utility model provides a slow-pressure supply system for a seawater desalination reverse osmosis membrane element, comprising a host computer, a high-pressure pump and an electric discharge ball valve, wherein the high-pressure pump comprises a high-pressure pump coupling end, a high-pressure pump water inlet, a high-pressure pump body, a high-pressure pump water outlet and a balancing plate, wherein the high-pressure pump water inlet is arranged at the front end of the high-pressure pump body, the high-pressure pump water outlet is arranged at the rear end of the high-pressure pump body, the balancing plate is arranged at the non-driving end of the high-pressure pump body, the non-driving end of the high-pressure pump is connected to a discharge pressure guiding pipeline, the end of the discharge pressure guiding pipeline is connected to a discharge pressure relief pipeline, and an electric discharge ball valve is installed in the middle of the discharge pressure guiding pipeline.

[0005] A valve fixing bracket is installed at the non-driving end of the high-pressure pump, and the electric drain ball valve is installed on the valve fixing bracket.

[0006] A pipeline fixing bracket is arranged at the non-driving end of the pump body of the high-pressure pump.

[0007] The utility model provides a slow-pressure supply system for a seawater desalination reverse osmosis membrane element, which has the beneficial effect that, during the process of opening and closing the high-pressure pump, when the high-pressure pump is operating at a speed lower than 1500r / min, the pressure is discharged by the electric discharge ball valve, thereby greatly reducing the impact pressure on the balancing plate due to insufficient speed, reducing the wear of the balancing plate, and increasing the service life of the high-pressure pump; the system is automatically controlled throughout the process, without the need for on-site personnel to perform any additional operations, and without the need for the on-duty personnel in the central control room and the on-site personnel to communicate and coordinate on relevant operating instructions, thereby avoiding damage to the high-pressure pump due to untimely or erroneous operations by on-duty personnel in the central control room, reducing the operating steps of the on-duty personnel in the central control room, reducing the workload of the staff, increasing operational safety, and being simple and convenient to use, performing a series of operations through signal feedback, which is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0009] Figure 2 This is the control schematic diagram of the electric drain ball valve;

[0010] Note in the figure:

[0011] 1. High-pressure pump coupling end; 2. High-pressure pump water inlet; 3. High-pressure pump body; 4. High-pressure pump water outlet; 5. Balance plate; 6. Discharge and pressure-guiding pipeline; 7. Valve fixing bracket; 8. Electric discharge ball valve; 9. Discharge and pressure-relief pipeline. DETAILED DESCRIPTION

[0012] With reference to the accompanying drawings and in combination with an embodiment, a slow pressure supply system for a seawater desalination reverse osmosis membrane element provided by the utility model is described in detail below.

[0013] Example

[0014] Reference Figure 1-Figure 2 A slow-pressure supply system for a seawater desalination reverse osmosis membrane element of the present embodiment includes a host computer, a high-pressure pump and an electric discharge ball valve. The high-pressure pump includes a high-pressure pump coupling end 1, a high-pressure pump water inlet 2, a high-pressure pump body 3, a high-pressure pump water outlet 4, and a balancing plate 5. The high-pressure pump water inlet 2 is arranged at the front end of the high-pressure pump body 3, the high-pressure pump water outlet 4 is arranged at the rear end of the high-pressure pump body 3, the balancing plate 5 is arranged at the non-driving end of the high-pressure pump body 3, the non-driving end of the high-pressure pump is connected to a discharge pressure guiding pipeline 6, the end of the discharge pressure guiding pipeline 6 is connected to a discharge pressure relief pipeline 9, and an electric discharge ball valve 8 is installed in the middle of the discharge pressure guiding pipeline 6.

[0015] A valve fixing bracket 7 is installed at the non-driving end of the high-pressure pump, and the electric drain ball valve 8 is installed on the valve fixing bracket 7 .

[0016] A pipeline fixing bracket is arranged at the non-driving end of the pump body of the high-pressure pump.

[0017] A discharge pressure guiding pipeline 6 and an electric discharge ball valve 8 are installed at the non-driving end of the high-pressure pump. When the high-pressure pump rotates at a speed of 1500 r / min, the electric discharge ball valve 8 is opened to discharge the internal pressure of the high-pressure pump and reduce the internal pressure of the high-pressure pump, thereby reducing the friction impact force between the balancing disks 5, increasing the space between the balancing disks 5, and reducing the wear of the balancing disks 5.

[0018] Before starting the high-pressure pump, the remote operator opens the electric drain ball valve 8, and then starts the high-pressure pump according to the operating procedures. When the speed of the high-pressure pump stabilizes and reaches the calibrated value, the remote operator closes the electric drain ball valve 8. After confirming that the on-site electric drain ball valve 8 is closed, the high-pressure pump continues to increase its frequency until the production requirements are met.

[0019] According to the existing technical means, the program is set. When the high-pressure pump is started, the upper computer sends a high-pressure pump start signal to the PLC system. The PLC system receives the instruction and sends a valve opening signal to control the opening of the electric leakage ball valve. After the electric leakage ball valve is opened, a valve opening signal is fed back to the PLC system. At this time, the electric leakage ball valve begins to play a leakage role. When the speed of the high-pressure pump is lower than 1500r / min, the impact pressure on the internal balance plate of the high-pressure pump is reduced to reduce the wear of the balance plate. At the same time, the PLC system starts timing, and after a delay of 90s, a valve closing signal is sent to control the closing of the on-site electric leakage ball valve. After the electric leakage ball valve is closed, a valve closing signal is fed back to the PLC system. At this time, the speed of the high-pressure pump is above 1500r / min, which has met the normal operation requirements of the high-pressure pump. After that, the high-pressure pump continues to increase its frequency until it meets the production requirements; when the high-pressure pump needs to be stopped, the upper computer manually reduces the frequency to 30hz and then sends a high-pressure pump stop signal to the PLC system. After receiving the command, the PLC system sends a valve opening signal to the solenoid valve to control the opening of the on-site electric discharge ball valve. After the electric discharge ball valve is opened, a valve opening position signal is fed back to the PLC system. At this time, the speed of the high-pressure pump is lower than 1500r / min. The internal pressure of the high-pressure pump is reduced by opening the valve to discharge, and the greater impact pressure on the balancing disk due to insufficient speed is reduced, thereby protecting the balancing disk. At the same time, the PLC system starts timing, and after a delay of 90s, a valve closing signal is sent to control the closing of the on-site electric discharge ball valve. After the electric discharge ball valve is closed, a valve closing position signal is fed back to the PLC system.

Claims

1. A slow pressure supply system for seawater desalination reverse osmosis membrane elements, characterized in that: It includes a host computer, a high-pressure pump and an electric discharge ball valve. The high-pressure pump includes a high-pressure pump coupling end, a high-pressure pump water inlet, a high-pressure pump body, a high-pressure pump water outlet, and a balancing plate. The high-pressure pump water inlet is arranged at the front end of the high-pressure pump body, the high-pressure pump water outlet is arranged at the rear end of the high-pressure pump body, the balancing plate is arranged at the non-driving end of the high-pressure pump body, the non-driving end of the high-pressure pump is connected to a discharge pressure guiding pipeline, the end of the discharge pressure guiding pipeline is connected to a discharge pressure relief pipeline, and an electric discharge ball valve is installed in the middle of the discharge pressure guiding pipeline.

2. The slow pressure supply system for seawater desalination reverse osmosis membrane elements according to claim 1, characterized in that: A valve fixing bracket is installed at the non-driving end of the high-pressure pump, and the electric drain ball valve is installed on the valve fixing bracket.

3. The slow pressure supply system for seawater desalination reverse osmosis membrane elements according to claim 1, characterized in that: A pipeline fixing bracket is arranged at the non-driving end of the pump body of the high-pressure pump.

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