Flushing device for complex reverse osmosis nanofiltration system

Abstract

The utility model discloses a flushing device for a complex reverse osmosis nanofiltration system, and belongs to the technical field of machinery and reverse osmosis nanofiltration. The equipment at least comprises a water source part, a pump set part and a pipeline valve part, the equipment at least comprises a flushing water tank, a flushing pump set and a make-up pump set, and a water tank is connected with all the pump sets in series through pipelines and then connected to all water using points through pipelines; manual valves are arranged on the pipelines and used for controlling emptying and overhauling of the water tank; the water tank is provided with an online liquid level meter for monitoring high and low liquid levels and low liquid level protection, and the pump is stopped when the liquid level is low; the water tank water inlet pipe is connected to the membrane system water producing pipe; the water tank water outlet pipe is a main pipe and is connected with a water inlet branch pipe of the pump set. According to the utility model, all membrane stacks of the complex reverse osmosis nanofiltration system can be simultaneously flushed and flushed in sections; the purpose of high-quality water replenishing of a chemical cleaning system and a dosing system can be achieved; the flushing system is simple in design and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical and reverse osmosis nanofiltration technical field relates to a complex reverse osmosis nanofiltration system flushing device. BACKGROUND

[0002] Complex reverse osmosis nanofiltration system: when the desalination system is concentrated for material, the reverse osmosis, nanofiltration membrane system combination form is multistage series, multi-point reflux mode, for example, the concentrated water of the first stage concentration membrane is used as the water inlet of the second stage concentration membrane, and the water production of the salt separation membrane is refluxed to the water inlet of the concentration membrane.

[0003] Flushing system: when the membrane system performance declines, the membrane surface is flushed with low-pressure large-flow water production to remove the pollutants on the membrane surface, so as to restore the water production performance of the membrane group. Reverse osmosis, nanofiltration membrane system is widely used in municipal, reclaimed water reuse, seawater desalination, chemical industry, wastewater treatment and other fields as high-efficiency desalination process. In the field of municipal, reclaimed water reuse, seawater desalination, reverse osmosis, nanofiltration membrane system is simple, and is mostly one-stage configuration, and the groups of membrane stacks are connected in parallel and independently operated, so that single-group membrane stack can be stopped for flushing without affecting the normal water production of the system. Under this condition, the flushing device only needs to meet the single-group membrane stack flushing requirement, and is designed according to the single-group membrane stack single-stage maximum flushing amount, and a set of flushing device is usually arranged, and a flowmeter is used to adjust the flushing amount. However, in the field of industrial zero discharge and lithium extraction from salt lake, the reverse osmosis, nanofiltration membrane system is usually complex configuration with multistage series and multi-point reflux, and the groups of membrane stacks are not independently operated and require that the system water production does not affect the subsequent process, so the flushing device design in the conventional municipal field cannot meet the system. The one-to-one flushing device design for the multistage reverse osmosis nanofiltration membrane system, that is, one set of flushing equipment for one membrane stack, is very complex, has large land occupation, high cost and energy consumption, and is difficult to operate. SUMMARY

[0004] The utility model provides a complex reverse osmosis nanofiltration system flushing device aiming at the prior art problem.

[0005] A complex reverse osmosis nanofiltration system flushing device at least includes a water source part, a pump group part and a pipeline valve part, and the equipment at least includes a flushing water tank, a flushing pump group and a water supplement pump group; the water tank and the pump groups are connected in series through pipelines, and then connected to each water point through the pipelines; the flushing water tank is provided with a water inlet pipe, an overflow vent pipe and a water outlet pipe; manual valves are arranged on the pipes to control the venting and maintenance of the water tank; the water tank is provided with an online liquid level meter to monitor the liquid level and low liquid level protection in real time, and the pump is stopped when the liquid level is low; the water inlet pipe of the water tank is connected to the membrane system water production pipe; and the water outlet pipe of the water tank is a main pipe connected to the water inlet branch pipes of the pump groups.

[0006] The water source part includes a flushing water tank, a venting manual valve, a liquid level meter, a water inlet manual valve and a water outlet manual valve. The pump group part is divided into a flushing pump group and a water supplement pump group. The flushing pump group includes a flushing centrifugal pump, a pump water inlet side manual valve, a pump water outlet side mechanical pressure gauge, a pump water outlet side check valve, a pump water outlet side manual valve and a standby pump switching automatic valve. The water supplement pump group includes a water supplement centrifugal pump, a pump water inlet side manual valve, a pump water outlet side mechanical pressure gauge, a pump water outlet side check valve and a pump water outlet side manual valve. The pipeline and valve part includes a first flushing main pipe electromagnetic flow meter, a second flushing main pipe electromagnetic flow meter, a first flushing main pipe pressure transmitter, a second flushing main pipe pressure transmitter, a first flushing branch pipe manual regulating valve, a second flushing branch pipe manual regulating valve, a first flushing branch pipe electromagnetic flow meter, a second flushing branch pipe electromagnetic flow meter, a chemical cleaning tank water supplement pipe automatic valve and a chemical tank water supplement pipe automatic valve.

[0007] The lower part of the flushing water tank of the water source part is connected with the venting manual valve and the water outlet manual valve through pipes respectively, the top of the flushing water tank is connected with the water inlet manual valve through a pipe, the liquid level meter is connected at the top of the flushing water tank, the upper part of the flushing water tank has a overflow, the overflow is connected with the venting pipe through a pipe, the other end of the water inlet manual valve is the membrane system water production pipe, one end of the flushing centrifugal pump of the first branch is connected with the pump water inlet side manual valve, the other end of the flushing centrifugal pump is connected with the pump water outlet side mechanical pressure gauge, the pump water outlet side check valve and the pump water outlet side manual valve respectively, the structures of the second branch and the third branch are the same as that of the first branch, the other end of the pump water outlet side manual valve of the first branch is connected with the first flushing branch manual stop valve and the second flushing branch manual stop valve through the pipe of the flushing path one respectively, the pipe of the flushing path one is connected with the first flushing main pipe electromagnetic flow meter and the first flushing main pipe pressure transmitter respectively, the other end of the first flushing branch manual stop valve is connected with the first flushing branch electromagnetic flow meter to the flushing point 1.1, the other end of the second flushing branch manual stop valve is connected with the second flushing branch electromagnetic flow meter to the flushing point 1.n, the second branch is the standby pump pipe, the other end of the pump water outlet side manual valve is connected with the first standby pump switching automatic valve and the second standby pump switching automatic valve to the flushing path one and the flushing path two respectively, the other end of the pump water outlet side manual valve of the third branch and the other end of the second standby pump switching automatic valve are connected with the third flushing branch manual stop valve and the fourth flushing branch manual stop valve through the pipe of the flushing path two respectively, the pipe of the flushing path two is connected with the second flushing main pipe electromagnetic flow meter and the second flushing main pipe pressure transmitter respectively, the other end of the third flushing branch manual stop valve is connected with the third branch electromagnetic flow meter to the flushing point 2.1, the other end of the fourth flushing branch manual stop valve is connected with the fourth flushing branch electromagnetic flow meter to the flushing point 2.n, one end of the water supplement centrifugal pump of the fourth branch is connected with the pump water inlet side manual valve, the other end of the water supplement centrifugal pump is connected with the pump water outlet side mechanical pressure gauge, the pump water outlet side check valve and the pump water outlet side manual valve, the water production pipes of the fourth branch and the fifth branch are connected, the other end of the pump water outlet side manual valve is connected with the chemical cleaning tank water supplement pipe automatic valve and the chemical tank water supplement pipe automatic valve, the other end of the chemical cleaning tank water supplement pipe automatic valve is connected with the chemical flushing tank, the other end of the chemical tank water supplement pipe automatic valve is connected with the chemical tank.

[0008] The fifth branch has the same structure as the fourth branch, and is a standby pump pipe.

[0009] The branch of the first flushing branch manual stop valve and the first flushing branch electromagnetic flow meter or the branch of the second flushing branch manual stop valve and the second flushing branch electromagnetic flow meter can form n branches, where n is a positive integer.

[0010] The branch with the manual shut-off valve of the third flushing branch and the electromagnetic flowmeter of the third branch, or the branch with the manual shut-off valve of the fourth flushing branch and the electromagnetic flowmeter of the fourth flushing branch, can form n branches, where n is a positive integer.

[0011] The lower part of the flushing water tank is connected to the vent valve and the outlet valve via pipes. The top of the flushing water tank is connected to the inlet valve via a pipe. A level gauge is connected to the top of the flushing water tank. The top of the flushing water tank has an overflow outlet, which is connected to the vent pipe via a pipe. The water inlet of the tank is the membrane system's permeate pipe, and the outlet pipe is a main pipe connected to the inlet pipes of each water pump. A standby pump is set up for the centrifugal pump set used for flushing. An inlet valve is installed on the inlet pipe of the first branch, and an outlet mechanical pressure gauge, a pump outlet check valve, and an outlet valve are installed on the outlet pipe. The structures of the second and third branches are the same as those of the first branch. The pump outlet pipe of the first branch serves as flushing path one, and the pump outlet pipe of the third branch serves as flushing path two. The water pipe serves as the second flushing path, with the second branch serving as a backup pump. Its outlet pipes are connected to each flushing path and switched via automatic valves. The first flushing path's pipes are connected to the first flushing main pipe's electromagnetic flow meter and the first flushing main pipe's pressure transmitter. The other end of each pipe is connected to flushing points 1.1 to 1.n (n is a positive integer) via flushing branch pipes 1 to n. Manual shut-off valves and branch pipe electromagnetic flow meters are installed on the flushing branch pipes. The second flushing path's pipes are connected to the second flushing main pipe's electromagnetic flow meter and the second flushing main pipe's pressure transmitter. The other end of each pipe is connected to flushing points 2.1 to 2.n (n is a positive integer) via flushing branch pipes 2 to n. Manual shut-off valves and branch pipe electromagnetic flow meters are installed on the flushing branch pipes.

[0012] The fourth branch's makeup water pump's inlet is connected to the inlet-side manual valve, and its outlet is connected to the outlet-side mechanical pressure gauge. The outlet-side check valve is also connected to the outlet-side manual valve. The fifth branch has the same structure as the fourth branch and serves as a backup pump. The fourth and fifth branch's product water pipes are connected, as are the automatic valves on the makeup water pipes of the chemical cleaning tank and the chemical storage tank. The other end of the automatic valves on the makeup water pipes of the chemical cleaning tank and the chemical storage tank is connected to the chemical flushing tank and the chemical storage tank, respectively. Factors considered in the flushing pump set design include: differences in flushing volume due to the series connection of membrane stacks; pressure differences caused by different internal configurations of the membrane stacks, such as two-stage or three-stage configurations; and differences between different types of membranes, such as nanofiltration, high-pressure nanofiltration, reverse osmosis, high-pressure reverse osmosis, and seawater desalination reverse osmosis.

[0013] Based on the above factors, this utility model scientifically classifies different flushing needs and selects equipment accordingly. There are two classification perspectives: the first is to group them according to their internal configuration, that is, to classify and design corresponding flushing pipelines for membrane stacks with two-section configurations and membrane stacks with three-section configurations respectively; the second is to group them according to the number of membrane shells in each membrane stack, and to set membrane stacks with similar numbers as the same flushing pipeline to ensure the uniformity of water distribution in the flushing pipeline.

[0014] After summarizing the design from the above perspectives, it is still necessary to use methods such as adjusting valves and electromagnetic flowmeters to meet the flushing requirements of different membrane stacks and different sections. The water replenishment unit of the chemical cleaning system and dosing system is mainly designed based on the water replenishment requirements of the replenishment points.

[0015] A complex reverse osmosis nanofiltration system flushing device includes a flushing tank. The lower part of the flushing tank is connected to a vent valve and a water outlet valve via pipes. The top of the flushing tank is connected to an inlet valve via a pipe. A level gauge is connected to the top of the flushing tank. The top of the flushing tank has an overflow outlet, which is connected to a vent pipe via a pipe. The water inlet of the tank is the membrane system's permeate pipe, and the outlet pipe is a main pipe connected to the inlet pipes of each water pump. The centrifugal pump set for flushing is equipped with a standby pump. The inlet pipe of the first branch is equipped with an inlet-side manual valve, and the outlet pipe is equipped with an outlet-side mechanical pressure gauge, a pump outlet-side check valve, and an outlet-side manual valve. The second and third branches have the same structure as the first branch. The pump outlet pipe of the first branch serves as flushing path one, and the pump outlet pipe of the third branch serves as flushing path two. The second branch is a standby pump, and its outlet pipe is connected to each flushing path and switched automatically by valves. The pipeline of flushing path one is connected to the first flushing main pipe electromagnetic flow meter and the first flushing main pipe pressure transmitter, respectively. The other end is connected to the flushing points 1.1 to 1.n through flushing branch pipes 1 to n. A manual shut-off valve and a branch pipe electromagnetic flow meter are installed on the flushing branch pipe. The pipeline of flushing path two is connected to the second flushing main pipe electromagnetic flow meter and the second flushing main pipe pressure transmitter, respectively. The other end is connected to the flushing points 2.1 to 2.n through flushing branch pipes 2 to n, respectively. A manual shut-off valve and a branch pipe electromagnetic flow meter are installed on the flushing branch pipe (n is a positive integer).

[0016] The fourth branch's water supply uses a centrifugal pump whose inlet is connected to the inlet-side manual valve, and whose outlet is connected to the outlet-side mechanical pressure gauge. The outlet-side check valve is also connected to the outlet-side manual valve. The fifth branch has the same structure as the fourth branch and serves as a backup pump branch. The fourth and fifth branch's product water pipes are connected to the automatic valves of the water supply pipes for the chemical cleaning tank and the storage tank. The other end of the automatic valves for the water supply pipes for the chemical cleaning tank and the storage tank is connected to the chemical rinsing tank and the storage tank, respectively.

[0017] The device described in this utility model includes three types of control instruments: a flushing water tank level gauge, an electromagnetic flow meter, and a pressure transmitter. The flushing water tank level gauge is mainly used for real-time monitoring of the liquid level and low-level protection, alarming and stopping the pump when the liquid level is low. The pressure transmitters on flushing paths one and two are used to control the frequency conversion of the water pump, mainly for constant pressure operation. The electromagnetic flow meter is used to calibrate the sum of the flow meters on each branch pipe. Electromagnetic flow meters are installed on the flushing branch pipes to control the manual shut-off valves on the branch pipes, ensuring that the pipeline meets the water demand of the corresponding flushing points.

[0018] This utility model solves the following technical problems:

[0019] 1. Conventional simple reverse osmosis nanofiltration flushing system designs are difficult to meet the requirements of simultaneous and segmented flushing of complex reverse osmosis nanofiltration systems.

[0020] 2. Problems with the chemical cleaning system's water replenishment and chemical dilution processes, resulting in a lack of high-quality produced water.

[0021] 3. The flushing system design of conventional complex reverse osmosis nanofiltration systems is overly redundant and inconvenient to operate.

[0022] The advantages of this invention are: it solves the problems of complex multi-stage series configuration and high operational requirements in reverse osmosis and nanofiltration systems, ensuring effective flushing without affecting subsequent processes; it also solves the problem of high-quality water for chemical cleaning systems and reagent dilution, preventing damage to the membrane from oxidizing substances in other water sources and improving the safety of cleaning and chemical dosing. Furthermore, this invention avoids redundant design, reducing equipment and operating costs, maximizing space utilization, ensuring effective flushing and water replenishment, guaranteeing the normal operation of subsequent processes, and improving system stability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. As shown in the figures:

[0024] Figure 1 This is a structural diagram of the present invention. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1: As Figure 1 As shown, a complex reverse osmosis nanofiltration system flushing device mainly includes a water source section, a pump group section, pipelines and valves section.

[0027] The lower part of the flushing water tank a in the water source section is connected to the venting manual valve 1 and the outlet manual valve 4 through pipes. The top of the flushing water tank a is connected to the inlet manual valve 3 through a pipe. The level gauge 2 is connected to the top of the flushing water tank a. There is an overflow port at the top of the flushing water tank a. The overflow port is connected to the venting pipe through a pipe. The other end of the inlet manual valve 3 is the membrane system water production pipe.

[0028] One end of the centrifugal pump b used for flushing in the first branch is connected to the manual valve 5 on the pump inlet side, and the other end of the centrifugal pump b is connected to the mechanical pressure gauge 6 on the pump outlet side, the check valve 7 on the pump outlet side, and the manual valve 8 on the pump outlet side.

[0029] The structure of the second and third branches is the same as that of the first branch.

[0030] The other end of the manual valve 8 on the pump outlet side of the first branch is connected to the manual shut-off valve 14 of the first flushing branch and the manual shut-off valve 16 of the second flushing branch through the pipeline of the first flushing path. The electromagnetic flow meter 10 of the first flushing main pipe and the pressure transmitter 11 of the first flushing main pipe are connected to the pipeline of the first flushing path.

[0031] The other end of the manual shut-off valve 14 of the first flushing branch is connected to the electromagnetic flow meter 15 of the first flushing branch at flushing point 1.1.

[0032] The other end of the manual shut-off valve 16 of the second flushing branch is connected to the electromagnetic flowmeter 17 of the second flushing branch as flushing point 1.n.

[0033] The branch of the first flushing branch manual shut-off valve 14 and the first flushing branch electromagnetic flowmeter 15, or the branch of the second flushing branch manual shut-off valve 16 and the second flushing branch electromagnetic flowmeter 17, can form n branches, where n is a positive integer.

[0034] The second branch is the backup pump pipeline. The other end of the manual valve 8 on the pump outlet side is connected to the first backup pump switching automatic valve 9 and the second backup pump switching automatic valve 9.1, respectively, to flushing path one and flushing path two.

[0035] The other end of the manual valve 8 on the pump outlet side of the third branch and the other end of the automatic valve 9.1 for switching the second standby pump are respectively connected to the manual shut-off valve 18 of the third flushing branch and the manual shut-off valve 20 of the fourth flushing branch through the pipeline of the second flushing path. The electromagnetic flow meter 12 of the second flushing main pipe and the pressure transmitter 13 of the second flushing main pipe are respectively connected to the pipeline of the second flushing path.

[0036] The other end of the manual shut-off valve 18 of the third flushing branch is connected to the electromagnetic flowmeter 19 of the third branch as flushing point 2.1.

[0037] The other end of the manual shut-off valve 20 of the fourth flushing branch is connected to the electromagnetic flow meter 21 of the fourth flushing branch as flushing point 2.n.

[0038] The branch of the third flushing branch manual shut-off valve 18 and the third branch electromagnetic flowmeter 19, or the branch of the fourth flushing branch manual shut-off valve 20 and the fourth flushing branch electromagnetic flowmeter 21, can form n branches, where n is a positive integer.

[0039] One end of the centrifugal pump c for water replenishment in the fourth branch is connected to the manual valve 22 on the pump inlet side, and the other end of the centrifugal pump c is connected to the mechanical pressure gauge 23 on the pump outlet side, the check valve 24 on the pump outlet side, and the manual valve 25 on the pump outlet side.

[0040] The fifth branch has the same structure as the fourth branch and serves as a backup pump pipeline.

[0041] The fourth branch and the fifth branch are connected by a water production pipe. The other end of the manual valve 25 on the pump outlet side is connected to the automatic valve 26 of the chemical cleaning tank water supply pipe and the automatic valve 27 of the medicine storage tank water supply pipe. The other end of the automatic valve 26 of the chemical cleaning tank water supply pipe is connected to the chemical rinsing tank, and the other end of the automatic valve 27 of the medicine storage tank water supply pipe is connected to the medicine storage tank.

[0042] The water source section includes a flushing water tank (a), a manual vent valve (1), a level gauge (2), a manual inlet valve (3), and a manual outlet valve (4). The pump set section is divided into a flushing pump set and a makeup water pump set. The flushing pump set includes a centrifugal pump (b), a manual inlet valve (5), a mechanical pressure gauge (6), a check valve (7), and a manual outlet valve (8), and an automatic valve for switching to the standby pump (9). The makeup water pump set includes a centrifugal pump (c), a manual inlet valve (22), a mechanical pressure gauge (23), and a check valve (24). Return valve 24, pump outlet manual valve 25; pipeline and valve section includes first flushing main pipe electromagnetic flow meter 10, second flushing main pipe electromagnetic flow meter 12, first flushing main pipe pressure transmitter 11, second flushing main pipe pressure transmitter 13, first flushing branch pipe manual regulating valve 14, second flushing branch pipe manual regulating valve 16, first flushing branch pipe electromagnetic flow meter 15, second flushing branch pipe electromagnetic flow meter 17, chemical cleaning tank water supply pipe automatic valve 26, and medicine storage tank water supply pipe automatic valve 27.

[0043] Process Description: A forward flushing procedure must be performed before each startup. The water source is the membrane system's produced water. The flushing water tank is a combined membrane system produced water tank and is equipped with an inlet pipe, an overflow vent pipe, and an outlet pipe. Manual valves are installed on all pipes to control the venting and maintenance of the water tank. The water tank is equipped with an online level gauge to monitor the liquid level in real time and has low-level protection. An alarm will sound and the pump will stop when the liquid level is low. The water tank outlet pipe is a main pipe that connects to the water pump's inlet branch pipe.

[0044] The water source is reverse osmosis permeate, and the permeate conductivity is generally required to be below 50 μm / cm to meet the needs of flushing and chemical preparation. The pump flow rate is selected based on the balance of flushing volume for each membrane stack and each section. The typical flushing flow rate for a single 8-inch membrane housing is 2.4–12 m³ / h. 3 The flushing pressure is 0.1–0.4 MPa per hour. The flushing pump is frequency-controlled, and a backup pump needs to be set up in the pump set. The pump is set according to the flushing pump with the maximum flow rate. Its product water pipe is connected to each flushing main pipe and switched by automatic valves. A pressure sensor and electromagnetic flow meter are installed on the flushing main pipe, and electromagnetic flow meters are installed on the branch pipes. The flushing pump operates at constant pressure and is controlled by the pressure transmitter on the flushing main pipe. The flushing branch pipes operate at constant flow and are controlled by adjusting the opening of the shut-off valve by the electromagnetic flow meter on the flushing branch pipe. The flow meter on the main pipe can be summed and cross-calibrated with the flow meters of each branch pipe. This design not only reduces the pump set configuration and the corresponding electrical automatic control system, but also saves space. The pipeline part mainly includes the pipes, valves and instruments that connect the equipment and the inlet and outlet water of the flushing system. The valves are used for control during different operations, and the instruments are used to adjust the equipment and valves to ensure flow distribution.

[0045] The water replenishment pump is used during the chemical cleaning process, which takes 1 to 3 months. The water replenishment pump is frequency-controlled to adapt to the needs of different water replenishment points. The pump set is configured with 1 pump in use and 1 pump on standby. The outlet pipes are combined into a main pipe, which is then divided into a water replenishment pipe for the chemical cleaning tank and a water replenishment pipe for the storage tank. The start and stop of the two branch pipes are controlled by automatic valves.

[0046] Example 2: A flushing device for a complex reverse osmosis nanofiltration system, applied to a lithium extraction project in a salt lake. The flushing process is required to not affect the operation of subsequent process sections, so overall flushing is considered.

[0047] This example includes a three-stage reverse osmosis system (first-stage, high-pressure reverse osmosis, and second-stage reverse osmosis) and a four-stage nanofiltration system (first-stage, dialysis nanofiltration, second-stage, and third-stage nanofiltration). These seven stages of reverse osmosis and nanofiltration are connected in series, forming a complex reverse osmosis-nanofiltration system. This example uses the permeate from the second-stage reverse osmosis as the flushing water source. The membrane configurations for each stage are shown in the table below.

[0048] Based on the configuration of membranes at each stage in the table above, this example is grouped into two-stage and three-stage configurations. One reverse osmosis flushing pump is selected to meet the simultaneous flushing requirements of primary reverse osmosis, high-pressure reverse osmosis, and secondary reverse osmosis. One nanofiltration flushing pump is selected to meet the simultaneous flushing requirements of primary nanofiltration, dialysis nanofiltration, secondary nanofiltration, and tertiary nanofiltration. The standby pump is designed as a high-flow-rate nanofiltration flushing water pump.

[0049] Flushing points 1.1, 1.2, and 1.3 are connected to each reverse osmosis membrane stack, and flushing points 2.1, 2.2, 2.3, and 2.4 are connected to each nanofiltration membrane stack.

[0050] When starting the flushing procedure, first start the centrifugal pump b for flushing. Depending on the different reverse osmosis flushing volumes of each group, the flow is passed through the electromagnetic flow meter 15 of the first flushing branch, the electromagnetic flow meter 17 of the second flushing branch, the first adjusting stop valve 14, and the second adjusting stop valve 16. After the reverse osmosis flushing is completed, the flow is passed through the electromagnetic flow meter 19 of the third branch, the electromagnetic flow meter 21 of the second branch, the first adjusting stop valve 18, and the second adjusting stop valve 20, depending on the different nanofiltration flushing volumes of each group.

[0051] During the flushing process, the electromagnetic flowmeter on the main pipe is monitored to ensure that its value is consistent with the sum of the flowmeter values ​​on each branch pipe. The pressure transmitter on the main pipe is used to control the variable frequency operation of the flushing pump. During the flushing procedure, the centrifugal pump b used for flushing is also controlled by the liquid level in the flushing water tank a. When a low liquid level alarm is triggered, the centrifugal pump b used for flushing must stop operating.

[0052] The water replenishment pump is used during the chemical cleaning process. When the chemical cleaning system needs to be replenished with water, the water replenishment centrifugal pump c and the first pipeline automatic valve 26 and the second pipeline automatic valve 27 are turned on. When the chemical cleaning tank or storage tank reaches the full water level, the first automatic valve 26 and the second automatic valve 27 must be turned off and the water replenishment centrifugal pump c must be stopped.

[0053] During the water replenishment process, the centrifugal pump C used for water replenishment is also controlled by the liquid level of the flushing water tank a. When a low liquid level alarm is triggered, the centrifugal pump C used for water replenishment needs to stop operating.

[0054] Example 3: As Figure 1 As shown, a complex reverse osmosis nanofiltration system flushing device includes at least a water source section, a pump set section, and a pipeline and valve section. The equipment includes at least a flushing water tank, a flushing pump set, and a makeup water pump set. The water tank and each pump set are connected in series via pipelines, which are then connected to each water point. The flushing water tank is equipped with an inlet pipe, an overflow vent pipe, and an outlet pipe. Manual valves are installed on each pipeline to control the emptying and maintenance of the water tank. The water tank is equipped with an online level gauge to monitor high and low liquid levels and has low liquid level protection; the pump stops when the liquid level is low. The water tank inlet pipe is connected to the membrane system product water pipe. The water tank outlet pipe is a main pipe connected to the inlet branch pipe of the pump set. It also includes a chemical cleaning system and a dosing system makeup water unit. The flushing pump sets are categorized into three types: first, based on internal configuration; second, based on membrane type; and third, based on the number of membrane shell sections in each membrane stack.

[0055] The flushing pump unit uses frequency converter control for its flushing water pumps. The flushing pump outlet pipe is the flushing main pipe, and the flushing branch pipes are connected to each flushing point. The pump's product water pipe is connected to each flushing main pipe and switched via automatic valves. A pressure transmitter is installed on the flushing main pipe for constant pressure control of the frequency converter pump. An online flow meter is installed to calibrate the total flow of the branch pipes. Online flow meters are also installed on the branch pipes to control the manual shut-off valves of each branch pipe to ensure flow distribution. The makeup water pump is frequency converter controlled and a backup pump is also considered. The product water pipe is connected to each makeup water point, and makeup water is controlled by automatic valves on the pipelines.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A complex reverse osmosis nanofiltration system flushing device, characterized in that, The device comprises at least a water source part, a pump group part and a pipeline valve part, and comprises at least a flushing water tank, a flushing pump group and a water supplement pump group. The water tank and each pump group are connected in series through pipelines, and then connected to each water point through pipelines. The flushing water tank is provided with an inlet pipe, an overflow vent pipe and an outlet pipe, and each pipe is provided with a manual valve for controlling the venting and maintenance of the water tank. The water tank is provided with an online liquid level meter for real-time monitoring of the liquid level and low liquid level protection, and the pump is stopped when the liquid level is low. The water inlet pipe of the water tank is connected to the water production pipe of the membrane system. The water outlet pipe of the water tank is a main pipe connected to the water inlet branch pipe of the pump group.

2. The system for flushing a complex reverse osmosis nanofiltration system according to claim 1, wherein, The water source part comprises a flushing water tank, a venting manual valve, a liquid level meter, a water inlet manual valve and a water outlet manual valve. The pump group part comprises a flushing pump group and a water supplement pump group. The flushing pump group comprises a flushing centrifugal pump, a pump inlet side manual valve, a pump outlet side mechanical pressure gauge, a pump outlet side check valve, a pump outlet side manual valve and a standby pump switching automatic valve. The water supplement pump group comprises a water supplement centrifugal pump, a pump inlet side manual valve, a pump outlet side mechanical pressure gauge and a pump outlet side check valve. The pipeline and valve part comprises a first flushing main pipe electromagnetic flow meter, a second flushing main pipe electromagnetic flow meter, a first flushing main pipe pressure transmitter, a second flushing main pipe pressure transmitter, a first flushing branch pipe manual regulating valve, a second flushing branch pipe manual regulating valve, a first flushing branch pipe electromagnetic flow meter, a second flushing branch pipe electromagnetic flow meter, a chemical cleaning tank water supplement pipe automatic valve and a chemical tank water supplement pipe automatic valve.

3. The system for flushing a complex reverse osmosis nanofiltration system of claim 1, wherein, The lower part of the flushing water tank of the water source part is connected to the venting manual valve and the water outlet manual valve through pipelines, respectively. The top of the flushing water tank is connected to the water inlet manual valve through a pipeline. The liquid level meter is connected to the top of the flushing water tank. The upper part of the flushing water tank has an overflow port connected to the venting pipeline through a pipeline. The other end of the water inlet manual valve is a membrane system water production pipeline, One end of the flushing centrifugal pump of the first branch is connected to the pump inlet side manual valve. The other end of the flushing centrifugal pump is connected to the pump outlet side mechanical pressure gauge, the pump outlet side check valve and the pump outlet side manual valve, respectively. The second branch and the third branch have the same structure as the first branch. The other end of the pump outlet side manual valve of the first branch is connected to the first flushing branch pipe manual stop valve and the second flushing branch pipe manual stop valve through the pipeline of the first flushing path, respectively. The other end of the first flushing branch pipe manual stop valve is connected to the first flushing branch pipe electromagnetic flow meter to form a flushing point 1.

1. The other end of the second flushing branch pipe manual stop valve is connected to the second flushing branch pipe electromagnetic flow meter to form a flushing point 1.n. The second branch is a standby pump pipeline. The other end of the pump outlet side manual valve is connected to the first standby pump switching automatic valve and the second standby pump switching automatic valve to form the first flushing path and the second flushing path, respectively. The other end of the pump outlet water side manual valve of the third branch and the other end of the second standby pump switching automatic valve are connected with the third flushing branch manual stop valve and the fourth flushing branch manual stop valve through the pipeline of flushing path two, and the pipeline of flushing path two is connected with the second flushing main pipe electromagnetic flow meter and the second flushing main pipe pressure transmitter respectively, The other end of the third flushing branch manual stop valve is connected with the third branch electromagnetic flow meter as flushing point 2.1, The other end of the fourth flushing branch manual stop valve is connected with the fourth flushing branch electromagnetic flow meter as flushing point 2.n, One end of the water replenishing centrifugal pump of the fourth branch is connected with the pump inlet water side manual valve, and the other end of the water replenishing centrifugal pump is connected with the pump outlet water side mechanical pressure gauge, the pump outlet water side check valve and the pump outlet water side manual valve, The water production pipe of the fourth branch and the fifth branch are connected, and the other end of the pump outlet water side manual valve is connected with the chemical cleaning tank water replenishing pipe automatic valve and the chemical agent storage tank water replenishing pipe automatic valve, the other end of the chemical cleaning tank water replenishing pipe automatic valve is connected with the chemical flushing tank, and the other end of the chemical agent storage tank water replenishing pipe automatic valve is connected with the chemical agent storage tank.

4. The system for flushing a complex reverse osmosis nanofiltration system of claim 3, wherein, The fifth branch has the same structure as the fourth branch, and is a standby pump pipeline.

5. The system for flushing a complex reverse osmosis nanofiltration system of claim 3, wherein, The branch of the first flushing branch manual stop valve and the first flushing branch electromagnetic flow meter or the branch of the second flushing branch manual stop valve and the second flushing branch electromagnetic flow meter can form n branches, and n is a positive integer.

6. The system for flushing a complex reverse osmosis nanofiltration system of claim 3, wherein, The branch of the third flushing branch manual stop valve and the third branch electromagnetic flow meter or the branch of the fourth flushing branch manual stop valve and the fourth flushing branch electromagnetic flow meter can form n branches, and n is a positive integer.

7. The system for flushing a complex reverse osmosis nanofiltration system of claim 2, wherein, The lower part of the flushing water tank is connected with the vent manual valve and the outlet water manual valve through the pipeline respectively, the top of the flushing water tank is connected with the inlet water manual valve through the pipeline, the liquid level meter is connected at the top of the flushing water tank, the top of the flushing water tank has a overflow port, the overflow port is connected with the vent pipe through the pipeline, the water inlet of the water tank is the membrane system water production pipeline, the water outlet pipe is a main pipe connected with the water inlet pipes of the water pumps, the flushing centrifugal pump group is provided with a standby pump, the water inlet pipe of the first branch is provided with a water inlet side manual valve, the water outlet pipe is provided with a water outlet side mechanical pressure gauge, a pump outlet water side check valve and a water outlet side manual valve, the structures of the second branch and the third branch are the same as that of the first branch, the pump outlet pipe of the first branch is used as flushing path one, the pump outlet pipe of the third branch is used as flushing path two, the second branch is a standby pump, the water outlet pipe thereof is connected to each flushing path and switched through an automatic valve, the pipeline of the flushing path one is connected with the first flushing main pipe electromagnetic flow meter and the first flushing main pipe pressure transmitter respectively, the other ends are connected to flushing points 1.1-1.n through flushing branches 1-1 respectively, the flushing branches are provided with manual stop valves and branch electromagnetic flow meters; the pipeline of the flushing path two is connected with the second flushing main pipe electromagnetic flow meter and the second flushing main pipe pressure transmitter respectively, the other ends are connected to flushing points 2.1-2.n through flushing branches 2-1 respectively, the flushing branches are provided with manual stop valves and branch electromagnetic flow meters, and n is a positive integer.

8. The complex reverse osmosis-nanofiltration system flushing device according to claim 2, characterized in that, The water inlet end of the centrifugal pump for water replenishment of the fourth branch is connected with the water inlet side manual valve, the water outlet end is connected with the water outlet side mechanical pressure gauge, the water outlet side check valve and the water outlet side manual valve, the fifth branch has the same structure as the fourth branch and is a standby pump branch, the fourth branch and the fifth branch are connected with the water production pipe and the automatic valve of the chemical cleaning tank and the medicine storage tank, and the other end of the automatic valve of the chemical cleaning tank and the medicine storage tank is connected with the chemical flushing tank and the medicine storage tank.

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