CN111167312B

CN111167312B - Concentrated water replacement system of raw water in DT membrane

Info

Publication number: CN111167312B
Application number: CN202010040119.7A
Authority: CN
Inventors: 王新; 胡婧; 闫斌; 刘远阳; 孙亚坤; 沈荣澍; 叶世火
Original assignee: Beijing Xianfeng Ruichuang Environmental Technology Co ltd
Current assignee: Beijing Xianfeng Ruichuang Environmental Technology Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2022-05-06
Anticipated expiration: 2040-01-15
Also published as: CN111167312A

Abstract

The invention discloses a concentrated water replacement system for raw water in a DT membrane, which comprises a raw water tank, a security filter, a surge tank, a double-plunger pump, a reverse osmosis membrane and a concentrated water tank, wherein the outlet of the raw water tank is connected with the inlet of the security filter, the outlet of the security filter is connected with the inlet of the surge tank and the pressurizing side inlet of the double-plunger pump, the pressurizing side outlet of the double-plunger pump is connected with the water inlet side inlet of the reverse osmosis membrane, the water inlet side outlet of the reverse osmosis membrane is connected with the driving side inlet of the double-plunger pump, the driving side outlet of the double-plunger pump is connected with the concentrated water tank, the outlet of the surge tank is connected with the pressurizing side inlet of the double-plunger pump, and the driving side outlet of the double-plunger pump is connected with the pressurizing side inlet of the double-plunger pump. Through the interaction of the double-plunger pump and the bag-type pressure stabilizing tank, the normal working process and the working process of replacing the concentrated water in the reverse osmosis membrane are switched, so that the continuous water production is realized; the concentrated water in the reverse osmosis membrane is replaced by the raw water, so that the power consumption of the system can be greatly reduced; the concentrated water in the reverse osmosis membrane is replaced by the raw water, so that the concentration of salt and pollutants in the reverse osmosis membrane can be reduced, and the service life of the reverse osmosis membrane is prolonged.

Description

Concentrated water replacement system of raw water in DT membrane

Technical Field

The invention relates to the field of sewage treatment, in particular to a concentrated water replacement system for raw water in a DT membrane.

Background

At present, in the field of sewage treatment, particularly in garbage penetrating fluid treatment, high-pressure concentrated water of a DT reverse osmosis membrane is pressurized by a circulating pump, and then is converged with high-pressure raw water and enters a water inlet end of a DT.

In the prior art, water to be treated in a raw water tank enters a high-pressure pump after passing through a security filter, the high-pressure pump boosts the pressure of the raw water and then mixes the raw water with water output by a high-pressure circulating pump to enter a DT membrane, high-pressure water flows through the DT membrane, part of the water becomes produced water and enters a water production tank, the concentrated high-pressure concentrated water is divided into two paths, one path of the high-pressure concentrated water is decompressed by an adjusting valve and then enters a concentrated water tank, and the other path of the high-pressure concentrated water is mixed with the high-pressure raw water at the outlet of the high-pressure pump by the circulating pump. In the process flow, in order to reduce and delay the pollution and blockage of the sewage to the DTRO membrane, a circulating pump is added, and the concentrated water is used for increasing the flow to scour the surface of the DT membrane so as to reduce the pollution and blockage of the membrane.

The above process is the most commonly used process flow of the DT membrane, and since the high-pressure raw water output by the high-pressure pump is mixed with the high-pressure concentrated water of the DT, the concentration of the water pollutants and the salt content in the DT membrane is increased, and with the operation of the DT system, the concentration of the water pollutants and the salt content in the DT membrane is continuously increased, and finally an equilibrium value is reached. Assuming that the high pressure pump outlet flow rate is Q1, the raw water salinity is C1, the low pressure concentrate discharge flow rate is Q2, and the discharge concentrate salinity is C2, the amount of salt entering the DT membrane and the amount of salt discharging the DT membrane are equal after a sufficient time has elapsed, therefore, the following formula can be derived.

Q1xC1 ═ Q2xC2, and from the above formula, C2 ═ Q1xC1/Q2 can be derived;

DT membrane systems are designed with a yield critical parameter. Assuming that the recovery rate is R, R is 1-Q2/Q1, and Q2 is (1-R) xQ 1. Substituting Q2 into the above formula yields C2 ═ C1/(1-R).

From this equation, the higher the designed recovery rate of the DT system, the higher the C2 value, the higher the final pressure of the DT system, and the higher the energy consumption. The concentration relationship of the contaminants is consistent with the above formula. The concentration of pollutants and salt content in the water in the DT system rises, and the concentrated water is always in a high-pressure state, so that the concentrated water in the DT membrane can be replaced by the raw water only when the DT system stops working and the water in the DT membrane becomes low pressure.

The existing DT membrane raw water and concentrated water replacement system is needed, and the problem that concentrated water in a membrane can be replaced by raw water only when the DT is shut down in the operation process is solved.

Disclosure of Invention

The invention aims to solve the problem that the concentrated water in the membrane cannot be replaced by raw water in the DT operation process in the prior art, and provides a DT membrane raw water concentrated water replacement system.

The invention provides a concentrated water replacement system for raw water in a DT membrane, which comprises a raw water tank, a security filter, a surge tank, a double-plunger pump, a reverse osmosis membrane and a concentrated water tank, wherein the outlet of the raw water tank is connected with the inlet of the security filter, the outlet of the security filter is connected with the inlet of the surge tank and the pressurizing side inlet of the double-plunger pump, the pressurizing side outlet of the double-plunger pump is connected with the water inlet side inlet of the DT membrane, the concentrated water side outlet of the DT membrane is connected with the driving side inlet of the double-plunger pump, the driving side outlet of the double-plunger pump is connected with the concentrated water tank, the outlet of the surge tank is connected with the pressurizing side inlet of the double-plunger pump, and the driving side outlet of the double-plunger pump is connected with the pressurizing side inlet of the double-plunger pump.

As an optimal mode, a first valve and a second valve which are connected in parallel are arranged between an outlet at the driving side of a double-plunger pump and a concentrated water tank; a third valve is arranged between the outlet at the driving side of the double-plunger pump and the inlet at the pressurizing side of the double-plunger pump; and a fourth valve is arranged between the outlet of the pressure stabilizing tank and the inlet of the pressurizing side of the double-plunger pump.

The invention relates to a concentrated water replacement system for raw water in a DT membrane, which is characterized in that as a preferred mode, a double-plunger pump comprises a driving cylinder, a hydraulic oil cylinder, a pressurizing cylinder and a piston rod, wherein the piston rod is connected with the driving cylinder, the hydraulic oil cylinder and the pressurizing cylinder in series; the driving cylinder comprises a driving cylinder body, a driving cylinder inner cavity, a control valve group and a driving cylinder piston, the driving cylinder inner cavity is arranged in the driving cylinder body, the driving cylinder piston is arranged in the driving cylinder inner cavity, the control valve group is connected with the driving cylinder inner cavity, and the driving cylinder piston is fixedly connected with one end of a piston rod; the inner cavity of the driving cylinder comprises a first inner cavity of the driving cylinder and a second inner cavity of the driving cylinder, and the first inner cavity of the driving cylinder and the second inner cavity of the driving cylinder are separated by a piston of the driving cylinder; the control valve group comprises a first control valve group and a second control valve group, the first control valve group is connected with the inner cavity of the first driving cylinder, and the second control valve group is connected with the inner cavity of the second driving cylinder; the first control valve group comprises a first inlet control valve and a first outlet control valve, the first inlet control valve and the first outlet control valve are connected with the inner cavity of the first driving cylinder, the second control valve group comprises a second inlet control valve and a second outlet control valve, and the second inlet control valve and the second outlet control valve are connected with the inner cavity of the second driving cylinder.

The invention relates to a concentrated water replacement system for raw water in a DT membrane, which is characterized in that as a preferred mode, a pressurizing cylinder comprises a pressurizing cylinder body, an inner cavity of the pressurizing cylinder, a one-way valve group and a piston of the pressurizing cylinder, wherein the inner cavity of the pressurizing cylinder is arranged in the pressurizing cylinder body, the piston of the pressurizing cylinder is arranged in the inner cavity of the pressurizing cylinder, the one-way valve group is connected with the inner cavity of the pressurizing cylinder, and the piston of the pressurizing cylinder is fixedly connected with the other end of a piston rod; the pressurizing cylinder inner cavity comprises a first pressurizing cylinder inner cavity and a second pressurizing cylinder inner cavity, and the first pressurizing cylinder inner cavity and the second pressurizing cylinder inner cavity are separated by a pressurizing cylinder piston; the check valve group comprises a first check valve group and a second check valve group, the first check valve group is connected with the inner cavity of the first pressurizing cylinder, and the second check valve group is connected with the inner cavity of the second pressurizing cylinder; the first check valve group comprises a first inlet check valve and a first outlet check valve, the first inlet check valve and the first outlet check valve are connected with the inner cavity of the first pressurizing cylinder, the second check valve group comprises a second inlet check valve and a second outlet check valve, and the second inlet check valve and the second outlet check valve are connected with the inner cavity of the second pressurizing cylinder.

The invention relates to a thick water replacement system for raw water in a DT membrane, which is characterized in that as an optimal mode, a hydraulic oil cylinder comprises a hydraulic oil cylinder body, a hydraulic oil cylinder inner cavity, a reversing valve and a hydraulic oil cylinder piston, wherein the hydraulic oil cylinder inner cavity is arranged in the hydraulic oil cylinder body, the hydraulic oil cylinder piston is arranged in the hydraulic oil cylinder inner cavity, the reversing valve is connected with the hydraulic oil cylinder inner cavity, and the hydraulic oil cylinder piston is fixedly connected with the middle part of a piston rod; the inner cavity of the hydraulic oil cylinder comprises a first hydraulic oil cylinder inner cavity and a second hydraulic oil cylinder inner cavity, and the first hydraulic oil cylinder inner cavity and the second hydraulic oil cylinder inner cavity are separated by a hydraulic oil cylinder piston; two oil ports of the reversing valve are respectively connected with the inner cavity of the first hydraulic oil cylinder and the inner cavity of the second hydraulic oil cylinder.

The movement of the pressurizing cylinder is divided into leftward movement and rightward movement. When the piston of the pressurizing cylinder needs to move leftwards, the hydraulic oil cylinder cavity close to one side of the pressurizing cylinder, namely the second hydraulic oil cylinder cavity, is communicated with the high-pressure oil port through the hydraulic oil reversing valve, and the hydraulic oil cylinder cavity on the other side, namely the first hydraulic oil cylinder cavity, is communicated with the low-pressure oil port. At the moment, high-pressure oil enters the second hydraulic oil cylinder cavity, leftward thrust is applied to the hydraulic oil cylinder piston, and the force is transmitted to the pressurizing cylinder piston rod through the hydraulic oil cylinder piston rod to pull the pressurizing cylinder piston rod to move leftward.

Meanwhile, a first outlet control valve and a second inlet control valve on the driving cylinder are opened, the first inlet control valve and the second outlet control valve are closed, high-pressure concentrated water from the DT membrane enters an inner cavity of a second driving cylinder of the driving cylinder, leftward thrust is applied to a piston of the driving cylinder, and the thrust is transmitted to a piston rod of the pressurizing cylinder through the piston rod of the driving cylinder and pulls the piston rod of the pressurizing cylinder to move leftward together with the piston rod of the hydraulic cylinder.

When the piston rod of the pressurizing cylinder moves leftwards, the first outlet one-way valve and the second inlet one-way valve are opened, the first inlet one-way valve and the second outlet one-way valve are closed, the pressurizing cylinder piston pressurizes the liquid in the inner cavity of the first pressurizing cylinder and discharges the liquid through the first outlet one-way valve, and meanwhile, the liquid to be pressurized enters the inner cavity of the second pressurizing cylinder of the pressurizing cylinder through the second inlet one-way valve.

When the cylinder piston moves to the far left, one stroke ends and the next stroke begins, i.e. the cylinder piston moves to the right. And controlling the hydraulic oil reversing valve to enable the inner cavity of the first hydraulic oil cylinder to be communicated with the high-pressure oil port, and the inner cavity of the second hydraulic oil cylinder to be communicated with the low-pressure oil port. The first inlet control valve and the second outlet control valve are opened, and the first outlet control valve and the second inlet control valve are closed. After the actions are finished, the high-pressure hydraulic oil pushes the hydraulic oil cylinder piston to move rightwards, the high-pressure concentrated water from the DT membrane pushes the driving cylinder piston to move rightwards, and the high-pressure concentrated water and the driving cylinder piston together push the pressurizing cylinder piston to move rightwards.

When the piston rod of the pressurizing cylinder moves rightwards, the first outlet one-way valve and the second inlet one-way valve are closed, the first inlet one-way valve and the second outlet one-way valve are opened, the piston of the pressurizing cylinder pressurizes liquid in the inner cavity of the second pressurizing cylinder and discharges the liquid through the second outlet one-way valve, and meanwhile, the liquid to be pressurized enters the inner cavity of the first pressurizing cylinder of the pressurizing cylinder through the first inlet one-way valve.

According to the DT membrane raw water and concentrated water replacement system, as a preferred mode, the first valve is a manual valve, and the second valve, the third valve and the fourth valve are electric valves.

According to the invention, as a preferable mode, the reverse osmosis membrane is the DT membrane.

The working process is divided into two parts, one is a normal working process, and the other is a working process of replacing the concentrated water in the DT membrane, and in the two working processes, the DT membrane system always works and operates and produces water.

And (3) normal working process: the second valve is closed, the third valve is opened, the fourth valve is closed, the first valve is always kept at a certain opening, raw water output by the water supply pump passes through the security filter, is mixed with low-pressure concentrated water and enters the double-plunger pump, the raw water is pressurized by the double-plunger pump and then becomes high-pressure water, the high-pressure water enters the DT membrane, one part of the high-pressure water becomes produced water, the other part of the high-pressure water becomes high-pressure concentrated water and returns to a driving cylinder of the double-plunger pump, the potential energy of the high-pressure concentrated water is utilized to assist the double-plunger pump to work, and the power consumption of the double-plunger pump is reduced. The high-pressure concentrated water after doing work is changed into low-pressure concentrated water and then is discharged from the double-plunger pump, the low-pressure concentrated water is divided into two paths, one path of water is discharged into a concentrated water tank through a first valve, and the other part of water is mixed with low-pressure raw water from a raw water tank through a third valve and then enters a pressurizing cavity in the double-plunger pump again to be pressurized.

Detecting the conductivity value of the concentrated water in the running process, and when the conductivity value reaches a certain set value, indicating that the salt content of the concentrated water is high, replacing the concentrated water in the DT membrane system with raw water, and then entering the working process of replacing the concentrated water in the DT membrane with the raw water.

In the working process of replacing the concentrated water in the DT membrane, the second valve is opened, the third valve is closed, the fourth valve is opened, the low-pressure concentrated water is not mixed with the raw water any more and is discharged into the concentrated water tank through the second valve, the raw water in the bag type pressure stabilizing tank enters the double-plunger pump, and the bag type pressure stabilizing tank is used for storing a certain amount of raw water in advance and releasing the raw water during replacement to make up the water amount of the concentrated water part because the flow of the water supply pump cannot meet the requirement of the required water inflow. Therefore, after a plurality of working cycles of the double-plunger pump, the concentrated water in the DT membrane can be completely replaced by the raw water and then returns to the normal working process.

The double-plunger pump is used, and the concentrated water and the raw water are mixed when the pressure is low, so that the concentrated water in the DT membrane can be replaced by the raw water without interrupting the DT operation. In the conventional process flow, the concentrated water and the raw water are mixed under a high-pressure condition, so that the concentrated water in the DT membrane cannot be replaced by the raw water during DT operation.

The raw water is used for replacing the concentrated water in the DT membrane, so that the power consumption of the system can be greatly reduced, the concentration of salt and pollutants in the DT membrane can be reduced, and the service life of the DT membrane is prolonged.

The invention has the following beneficial effects:

(1) the double-plunger pump interacts with the bag-type pressure stabilizing tank to switch normal working processes, one is a working process of replacing concentrated water in a DT (DT separator) membrane, and continuous water production is realized;

(2) the concentrated water in the DT membrane is replaced by the raw water, so that the power consumption of the system can be greatly reduced;

(3) the concentrated water in the DT membrane is replaced by the raw water, so that the concentration of salt and pollutants in the DT membrane can be reduced, and the service life of the DT membrane is prolonged.

Drawings

FIG. 1 is a schematic diagram of a concentrated water replacement system for raw water in a DT membrane;

FIG. 2 is a schematic diagram of a double-plunger pump of a DT membrane raw water concentrated water displacement system;

FIG. 3 is a schematic diagram of a driving cylinder of a DT membrane raw water and concentrated water displacement system;

FIG. 4 is a schematic diagram of the inner cavity of a driving cylinder of a DT membrane raw water concentrated water displacement system;

FIG. 5 is a schematic diagram of a control valve set of a DT membrane raw water and concentrated water displacement system;

FIG. 6 is a schematic diagram of a first control valve bank and a second control valve bank of a DT intra-membrane raw water concentrated water replacement system;

FIG. 7 is a schematic view of a pressurized cylinder of a DT membrane raw water and concentrated water displacement system;

FIG. 8 is a schematic diagram of the inner cavity of a pressurized cylinder of a DT membrane raw water concentrated water displacement system;

FIG. 9 is a schematic view of a check valve set of a concentrated water replacement system for raw water in a DT membrane;

FIG. 10 is a schematic view of a first check valve set and a second check valve set of a DT membrane raw water and concentrated water replacement system;

FIG. 11 is a schematic view of a hydraulic oil cylinder of a DT membrane raw water and concentrated water displacement system;

FIG. 12 is a schematic diagram of the inner cavity of a hydraulic oil cylinder of a DT membrane raw water concentrated water displacement system.

Reference numerals:

1. a raw water tank; 2. a cartridge filter; 3. a surge tank; 4. a double plunger pump; 41. a drive cylinder; 411. a drive cylinder body; 412. an inner cavity of the driving cylinder; 4121. a first drive cylinder inner chamber; 4122. the inner cavity of the second driving cylinder; 413. a control valve group; 4131. a first control valve group; 41311. a first inlet control valve; 41312. a first outlet control valve; 4132. a second control valve group; 41321. a second inlet control valve; 41322. a second outlet control valve; 414. a drive cylinder piston; 42. a hydraulic cylinder; 421. a hydraulic cylinder body; 422. the inner cavity of the hydraulic oil cylinder; 4221. an inner cavity of the first hydraulic oil cylinder; 4222. an inner cavity of a second hydraulic oil cylinder; 423. a diverter valve; 424. a hydraulic cylinder piston; 43. pressurizing a cylinder; 431. a pressure cylinder body; 432. an inner cavity of the pressurizing cylinder; 4321. a first pressurized cylinder inner chamber; 4322. a second pressurized cylinder inner chamber; 433. a check valve group; 4331. a first check valve group; 43311. a first inlet check valve; 43312. a first outlet check valve; 4332. a second check valve group; 43321. a second inlet check valve; 43322. a second outlet check valve; 434. a pressure cylinder piston; 44. a piston rod; 5. a reverse osmosis membrane; 6. a concentrated water tank; 7. a first valve; 8. a second valve; 9. a third valve; 10. and a fourth valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

As shown in fig. 1, a concentrated water replacement system for original water in DT membrane comprises an original water tank 1, a cartridge filter 2, a surge tank 3, a double-plunger pump 4, a reverse osmosis membrane 5 and a concentrated water tank 6, wherein an outlet of the original water tank 1 is connected with an inlet of the cartridge filter 2, an outlet of the cartridge filter 2 is connected with an inlet of the surge tank 3 and a pressurizing side inlet of the double-plunger pump 4, an outlet of the pressurizing side of the double-plunger pump 4 is connected with an inlet of the water inlet side of the reverse osmosis membrane 5, an outlet of the concentrated water side of the reverse osmosis membrane 5 is connected with an inlet of the driving side of the double-plunger pump 4, an outlet of the driving side of the double-plunger pump 4 is connected with the concentrated water tank 6, an outlet of the surge tank 3 is connected with an inlet of the pressurizing side of the double-plunger pump 4, and an outlet of the driving side of the double-plunger pump 4 is connected with an inlet of the pressurizing side of the double-plunger pump 4. A first valve 7 and a second valve 8 which are connected in parallel are arranged between the driving side outlet of the double-plunger pump 4 and the concentrated water tank 6; a third valve 9 is arranged between the outlet on the driving side of the double-plunger pump 4 and the inlet on the pressurizing side of the double-plunger pump 4; a fourth valve 10 is arranged between the outlet of the surge tank 3 and the inlet of the pressurizing side of the double-plunger pump 4. The first valve 7 is a manual valve, and the second valve 8, the third valve 9 and the fourth valve 10 are electric valves. The reverse osmosis membrane 5 is a DT membrane. A water feeding pump is also arranged between the raw water tank 1 and the cartridge filter 2.

As shown in fig. 2, the double plunger pump 4 includes a driving cylinder 41, a hydraulic cylinder 42, a pressurizing cylinder 43, and a piston rod 44, and the piston rod 44 drives the cylinder 41, the hydraulic cylinder 42, and the pressurizing cylinder 43 in series.

As shown in fig. 3, the driving cylinder 41 includes a driving cylinder body 411, a driving cylinder inner cavity 412, a control valve group 413 and a driving cylinder piston 414, the driving cylinder inner cavity 412 is disposed inside the driving cylinder body 411, the driving cylinder piston 414 is disposed in the driving cylinder inner cavity 412, the control valve group 413 is connected to the driving cylinder inner cavity 412, and the driving cylinder piston 414 is fixedly connected to one end of the piston rod 44.

As shown in FIG. 4, the drive cylinder chamber 412 includes a first drive cylinder chamber 4121 and a second drive cylinder chamber 4122, the first drive cylinder chamber 4121 and the second drive cylinder chamber 4122 separated by the drive cylinder piston 414.

As shown in fig. 5, the control valve block 413 includes a first control valve block 4131 and a second control valve block 4132, the first control valve block 4131 coupled to the first drive cylinder chamber 4121 and the second control valve block 4132 coupled to the second drive cylinder chamber 4122.

As shown in fig. 6, the first control valve group 4131 includes a first inlet control valve 41311 and a first outlet control valve 41312, the first inlet control valve 41311 and the first outlet control valve 41312 are connected to the first drive cylinder chamber 4121, the second control valve group 4132 includes a second inlet control valve 41321 and a second outlet control valve 41322, and the second inlet control valve 41321 and the second outlet control valve 41322 are connected to the second drive cylinder chamber 4122.

As shown in fig. 7, the pressurizing cylinder 43 includes a pressurizing cylinder body 431, a pressurizing cylinder inner chamber 432, a check valve group 433, and a pressurizing cylinder piston 434, the pressurizing cylinder inner chamber 432 is provided inside the pressurizing cylinder body 431, the pressurizing cylinder piston 434 is provided in the pressurizing cylinder inner chamber 432, the check valve group 433 is connected to the pressurizing cylinder inner chamber 432, and the pressurizing cylinder piston 434 is fixedly connected to the other end of the piston rod 44.

As shown in fig. 8, the cylinder bore 432 includes a first cylinder bore 4321 and a second cylinder bore 4322, the first cylinder bore 4321 and the second cylinder bore 4322 separated by a cylinder piston 434.

As shown in fig. 9, the check valve set 433 includes a first check valve set 4331 and a second check valve set 4332, the first check valve set 4331 is connected to the first pressurized cylinder bore 4321, and the second check valve set 4332 is connected to the second pressurized cylinder bore 4322.

As shown in fig. 10, the first set of check valves 4331 includes a first inlet check valve 43311 and a first outlet check valve 43312, the first inlet check valve 43311 and the first outlet check valve 43312 are connected to the first pressurized cylinder bore 4321, the second set of check valves 4332 includes a second inlet check valve 43321 and a second outlet check valve 43322, and the second inlet check valve 43321 and the second outlet check valve 43322 are connected to the second pressurized cylinder bore 4322.

As shown in fig. 11, hydraulic cylinder 42 includes a hydraulic cylinder body 421, a hydraulic cylinder inner cavity 422, a reversing valve 423, and a hydraulic cylinder piston 424, hydraulic cylinder inner cavity 422 is disposed inside hydraulic cylinder body 421, hydraulic cylinder piston 424 is disposed inside hydraulic cylinder inner cavity 422, reversing valve 423 is connected to hydraulic cylinder inner cavity 422, and hydraulic cylinder piston 424 is fixedly connected to the middle of piston rod 44.

As shown in fig. 12, the hydraulic cylinder chamber 422 includes a first hydraulic cylinder chamber 4221 and a second hydraulic cylinder chamber 4222, the first hydraulic cylinder chamber 4221 and the second hydraulic cylinder chamber 4222 are separated by a hydraulic cylinder piston 424; two oil ports of the reversing valve 423 are respectively connected with an inner cavity 4221 of the first hydraulic oil cylinder and an inner cavity 4222 of the second hydraulic oil cylinder.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A concentrated water replacement system of raw water in DT membrane, characterized by: comprises a raw water tank (1), a security filter (2), a pressure stabilizing tank (3), a double-plunger pump (4), a reverse osmosis membrane (5) and a concentrated water tank (6), the outlet of the raw water tank (1) is connected with the inlet of the cartridge filter (2), the outlet of the cartridge filter (2) is connected with the inlet of the surge tank (3) and the inlet of the pressurizing side of the double-plunger pump (4), the outlet at the pressurizing side of the double-plunger pump (4) is connected with the inlet at the water inlet side of the reverse osmosis membrane (5), the concentrated water side outlet of the reverse osmosis membrane (5) is connected with the driving side inlet of the double-plunger pump (4), the outlet of the driving side of the double-plunger pump (4) is connected with the concentrated water tank (6), the outlet of the pressure stabilizing tank (3) is connected with the inlet of the pressurizing side of the double-plunger pump (4), the outlet at the driving side of the double-plunger pump (4) is connected with the inlet at the pressurizing side of the double-plunger pump (4); a first valve (7) and a second valve (8) which are connected in parallel are arranged between the outlet of the driving side of the double-plunger pump (4) and the concentrated water tank (6); a third valve (9) is arranged between the outlet at the driving side of the double-plunger pump (4) and the inlet at the pressurizing side of the double-plunger pump (4); a fourth valve (10) is arranged between the outlet of the pressure stabilizing tank (3) and the inlet of the pressurizing side of the double-plunger pump (4); the pressure stabilizing tank (3) is a bag type pressure stabilizing tank for storing raw water in advance.

2. The system for replacing concentrated raw water in a DT membrane according to claim 1, wherein: the double-plunger pump (4) comprises a driving cylinder (41), a hydraulic oil cylinder (42), a pressurizing cylinder (43) and a piston rod (44), wherein the piston rod (44) is connected with the driving cylinder (41), the hydraulic oil cylinder (42) and the pressurizing cylinder (43) in series; the driving cylinder (41) comprises a driving cylinder body (411), a driving cylinder inner cavity (412), a control valve group (413) and a driving cylinder piston (414), the driving cylinder inner cavity (412) is arranged inside the driving cylinder body (411), the driving cylinder piston (414) is arranged in the driving cylinder inner cavity (412), the control valve group (413) is connected with the driving cylinder inner cavity (412), and the driving cylinder piston (414) is fixedly connected with one end of the piston rod (44); the drive cylinder bore (412) comprises a first drive cylinder bore (4121) and a second drive cylinder bore (4122), the first drive cylinder bore (4121) and the second drive cylinder bore (4122) separated by the drive cylinder piston (414); the control valve block (413) comprises a first control valve block (4131) and a second control valve block (4132), the first control valve block (4131) is connected with the first drive cylinder cavity (4121), and the second control valve block (4132) is connected with the second drive cylinder cavity (4122); the first control valve group (4131) includes a first inlet control valve (41311) and a first outlet control valve (41312), the first inlet control valve (41311) and the first outlet control valve (41312) are connected to the first drive cylinder bore (4121), the second control valve group (4132) includes a second inlet control valve (41321) and a second outlet control valve (41322), the second inlet control valve (41321) and the second outlet control valve (41322) are connected to the second drive cylinder bore (4122).

3. The system of claim 2, wherein the system comprises: the pressurizing cylinder (43) comprises a pressurizing cylinder body (431), a pressurizing cylinder inner cavity (432), a check valve group (433) and a pressurizing cylinder piston (434), the pressurizing cylinder inner cavity (432) is arranged inside the pressurizing cylinder body (431), the pressurizing cylinder piston (434) is arranged in the pressurizing cylinder inner cavity (432), the check valve group (433) is connected with the pressurizing cylinder inner cavity (432), and the pressurizing cylinder piston (434) is fixedly connected with the other end of the piston rod (44); the pressurized cylinder inner chamber (432) comprises a first pressurized cylinder inner chamber (4321) and a second pressurized cylinder inner chamber (4322), the first pressurized cylinder inner chamber (4321) and the second pressurized cylinder inner chamber (4322) separated by the pressurized cylinder piston (434); the check valve group (433) comprises a first check valve group (4331) and a second check valve group (4332), the first check valve group (4331) is connected with the first pressurizing cylinder inner cavity (4321), and the second check valve group (4332) is connected with the second pressurizing cylinder inner cavity (4322); the first check valve set (4331) comprises a first inlet check valve (43311) and a first outlet check valve (43312), the first inlet check valve (43311) and the first outlet check valve (43312) are connected to the first pressurized cylinder bore (4321), the second check valve set (4332) comprises a second inlet check valve (43321) and a second outlet check valve (43322), the second inlet check valve (43321) and the second outlet check valve (43322) are connected to the second pressurized cylinder bore (4322).

4. The system of claim 2, wherein the system comprises: the hydraulic oil cylinder (42) comprises a hydraulic oil cylinder body (421), a hydraulic oil cylinder inner cavity (422), a reversing valve (423) and a hydraulic oil cylinder piston (424), the hydraulic oil cylinder inner cavity (422) is arranged in the hydraulic oil cylinder body (421), the hydraulic oil cylinder piston (424) is arranged in the hydraulic oil cylinder inner cavity (422), the reversing valve (423) is connected with the hydraulic oil cylinder inner cavity (422), and the hydraulic oil cylinder piston (424) is fixedly connected with the middle part of the piston rod (44); the hydraulic oil cylinder inner cavity (422) comprises a first hydraulic oil cylinder inner cavity (4221) and a second hydraulic oil cylinder inner cavity (4222), and the first hydraulic oil cylinder inner cavity (4221) and the second hydraulic oil cylinder inner cavity (4222) are separated through the hydraulic oil cylinder piston (424); two oil ports of the reversing valve (423) are respectively connected with the inner cavity (4221) of the first hydraulic oil cylinder and the inner cavity (4222) of the second hydraulic oil cylinder.

5. The system of claim 1, wherein the system comprises: the first valve (7) is a manual valve, and the second valve (8), the third valve (9) and the fourth valve (10) are electric valves.

6. The system of claim 1, wherein the system comprises: the reverse osmosis membrane (5) is a DT membrane.

7. The system of claim 1, wherein the system comprises: a water feeding pump is also arranged between the raw water tank (1) and the cartridge filter (2).