Rapid intervention method without disassembling PX device when rotor of reverse PX device does not rotate

Abstract

The invention belongs to the technical field of mechanical engineering, and particularly relates to a quick intervention method without disassembling a PX device when a rotor of a reverse PX device does not rotate. The method comprises the following steps: step 1, confirming that the loading rate of a booster pump is set to be maximum, and loading to rated flow at the fastest speed to ensure that the impact on a rotor of a primary reverse osmosis device is maximum at the starting moment of the booster pump; step 2, opening an unqualified water discharge valve and an exhaust valve, starting a water feed pump to charge and lubricate a primary reverse osmosis device and an energy recovery device, and establishing a water flow path until water charge and exhaust are sufficient, and the flow of the water feed pump and the low-pressure outlet flow are balanced; step 3, starting a booster pump; 4, stopping the booster pump; 5, repeating the step 3 and the step 4; step 6, stopping the feed pump, and closing the unqualified water discharge valve; and 7, verifying whether the rotor of the energy recovery device recovers rotation or not. The defects that maintenance is time-consuming and labor-consuming, the available time of equipment is affected, the equipment is prone to loss and damage, and foreign matter entering risks exist are overcome.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical engineering, and in particular relates to a quick intervention method for a PX device without disassembling the PX device when the rotor of the PX device does not rotate. Background Art

[0002] The main function of the primary reverse osmosis PX energy recovery device is: the reverse osmosis desalination process consumes a lot of electricity to increase the inlet pressure to overcome the osmotic pressure, and the resulting concentrated water pressure is also high. Based on a 45% recovery rate, about 55% of the pressure energy is contained in the concentrated water. The primary reverse osmosis energy recovery device transfers the concentrated water pressure energy to the inlet water, reducing the energy consumption of seawater desalination water production.

[0003] The failure of the rotor to rotate in the first-stage reverse osmosis energy recovery device is one of the common faults of the energy recovery device. When the rotor does not rotate, the pressure energy cannot be transmitted, the high-pressure energy of the concentrated drainage is wasted, the first-stage reverse osmosis water production flow rate is reduced, the frequency of the high-pressure pump is increased, and the energy consumption is increased.

[0004] The main reason why the rotor of the first-stage reverse osmosis PX energy recovery device does not rotate is that the rotor has high machining precision and small gap. When the rotor in the PX device is dry or there are small salt crystals or other foreign matter, the rotor of the first-stage reverse osmosis PX energy recovery device will not rotate. When the rotor does not rotate, there are mainly two methods to restore the rotor rotation of the first-stage reverse osmosis PX energy recovery device: 1. Remove the top cover of the energy recovery device and manually turn the rotor with a toggle tool. If it can be turned, the manual turning is successful. If it fails, method 2 needs to be adopted; 2. Disassemble the first-stage reverse osmosis PX energy recovery device with a non-rotating rotor, take out the rotor parts for cleaning, grinding, and reassembly. Both of the above methods require drainage and disassembly of the first-stage reverse osmosis PX energy recovery device. The following problems exist: it is necessary to contact equipment maintenance personnel to dismantle the first-level reverse osmosis PX energy recovery device; the dismantling process requires isolation, drainage, and dismantling, and the entire process takes a long time, increasing the unavailability time of the equipment; the number of times the equipment is dismantled increases, increasing the loss of equipment connectors, sealing devices, etc.; the dismantling process increases the risk of foreign matter entering; the rotor of the first-level reverse osmosis PX energy recovery device is a ceramic component, which is prone to collision and damage during disassembly and transportation. Summary of the invention

[0005] The present invention provides a method for rapid intervention without dismantling a PX device when the rotor of a reverse osmosis device does not rotate. The method utilizes a booster pump to quickly start up to generate an instantaneous thrust on the rotor of a first-stage reverse osmosis PX energy recovery device, so as to achieve the purpose of rapidly restoring the rotation of the rotor without dismantling the PX device, thereby overcoming the time-consuming and labor-intensive maintenance, affecting the available time of the equipment, and easily causing equipment loss and damage, as well as the risk of foreign matter entering the equipment.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A quick intervention method for a PX device when the rotor does not rotate without dismantling the PX device:

[0008] Step 1: Confirm that the booster pump loading rate is set to the maximum, and load to the rated flow rate at the fastest speed to ensure that the booster pump has the greatest impact on the rotor of the first-stage reverse osmosis device when it is started;

[0009] Step 2: Open the unqualified water discharge valve and the exhaust valve, start the water pump to fill and lubricate the primary reverse osmosis device and the energy recovery device, and establish a water flow path until the water is filled and the exhaust is sufficient, and the water pump flow and the low-pressure outflow flow are balanced;

[0010] Step 3, start the booster pump;

[0011] Step 4, shut down the booster pump;

[0012] Step 5. Repeat steps 3 and 4;

[0013] Step 6: Stop the water supply pump and close the unqualified water discharge valve;

[0014] Step 7: Verify whether the energy recovery device rotor resumes rotation.

[0015] Step 1: Set the initial frequency of the booster pump to 32 Hz.

[0016] Step 1: The initial frequency of the booster pump is selected based on the energy recovery device maintaining 470m before the high-pressure pump is started. 3 Frequency at / h.

[0017] Step 2: 470m 3 / h flow rate is used to fill, lubricate and establish water flow paths for the primary reverse osmosis device and energy recovery device.

[0018] Step 2: The balance time between the water supply pump flow and the low-pressure outflow is 5 minutes.

[0019] Step 3: Start the booster pump until the flow rate stabilizes at 470m 3 / h after 3min.

[0020] Step 5. Repeat steps 3 and 4 two or three times.

[0021] The beneficial effects achieved by the present invention are:

[0022] The present invention does not need to contact equipment maintenance personnel to disassemble the primary reverse osmosis PX energy recovery device; the present invention does not disassemble the primary reverse osmosis PX energy recovery device, thus saving the entire rotor rotation recovery time and reducing the system unavailable time; the present invention does not disassemble the primary reverse osmosis PX energy recovery device, thus reducing the loss of connectors, sealing devices, etc.; the present invention can reduce the risk of foreign matter entering; the present invention can avoid rotor parts from being rubbed and damaged during disassembly and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of a primary reverse osmosis device. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] A method for quickly intervening in a PX device when the rotor does not rotate without dismantling the PX device comprises the following steps:

[0026] Step 1: Set the frequency converter cabinet of the booster pump of the first-stage reverse osmosis device, confirm that the initial frequency of the booster pump is set to 32Hz, and the loading rate is set to the maximum. The selection of the initial frequency is based on the energy recovery device maintaining 470m before the high-pressure pump is started. 3 The frequency maintained at / h and the purpose of setting the loading rate to the maximum is to load to the rated flow rate as quickly as possible to ensure that the booster pump has the greatest impact on the rotor of the first-stage reverse osmosis PX device at the moment of starting, and the effect is best.

[0027] Step 2: Open the unqualified water discharge valve and exhaust valve, start the first-stage reverse osmosis water pump at 470m 3 / h flow rate to fill, lubricate and establish water flow path for the primary reverse osmosis device and energy recovery device until the water filling and exhaust are sufficient, and the flow rate of the water pump and the low-pressure outflow are balanced, which usually takes about 5 minutes;

[0028] Step 3: Start the booster pump until the flow rate stabilizes at 470m 3 / h after 3min.

[0029] Step 4: Stop the booster pump.

[0030] Step 5. Repeat steps 3 and 4 two or three times.

[0031] Step 6: Shut down the primary reverse osmosis water pump and close the unqualified water discharge valve.

[0032] Step 7: Start the first-stage reverse osmosis water production to verify whether the rotor of the first-stage reverse osmosis PX energy recovery device resumes rotation.

[0033] The present invention does not need to contact equipment maintenance personnel to dismantle the primary reverse osmosis PX energy recovery device, which saves manpower, saves the entire rotor rotation recovery time, reduces the system unavailable time, reduces the loss of connectors, sealing devices, etc., can reduce the risk of foreign matter, and can avoid rotor parts from being rubbed and damaged during disassembly and transportation. At the same time, the system can be restored to availability through process system operation, which can be achieved through an automatic logic module to reduce human errors.

Claims

1. A method for rapid intervention when the rotor of a PX device does not rotate without dismantling the PX device, characterized by: Step 1: Confirm that the booster pump loading rate is set to the maximum, and load to the rated flow rate at the fastest speed to ensure that the booster pump has the greatest impact on the rotor of the first-stage reverse osmosis device when it is started; Step 2: Open the unqualified water discharge valve and the exhaust valve, start the water pump to fill and lubricate the primary reverse osmosis device and the energy recovery device, and establish a water flow path until the water is filled and the exhaust is sufficient, and the water pump flow and the low-pressure outflow flow are balanced; Step 3, start the booster pump; Step 4, shut down the booster pump; Step 5. Repeat steps 3 and 4; Step 6: Stop the water supply pump and close the unqualified water discharge valve; Step 7: Verify whether the energy recovery device rotor resumes rotation.

2. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 1: The initial frequency of the booster pump is set to 32 Hz.

3. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 1: The initial frequency of the booster pump is selected based on the energy recovery device maintaining 470m before the high-pressure pump is started. 3 Frequency at / h.

4. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 2: 470m 3 / h flow rate is used to fill, lubricate and establish water flow paths for the primary reverse osmosis device and energy recovery device.

5. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 2: The balance time between the water supply pump flow and the low-pressure outflow is 5 minutes.

6. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 3: Start the booster pump until the flow rate stabilizes at 470m 3 / h after 3min.

7. The method for rapid intervention of a PX device without dismantling the PX device when the rotor of the PX device does not rotate according to claim 1, characterized in that: Step 5. Repeat steps 3 and 4 two or three times.

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