Pressure center type reverse osmosis seawater desalination system

Abstract

The utility model relates to the technical field and discloses a pressure center type reverse osmosis seawater desalination system which comprises a reverse osmosis device, a high-pressure pump, a low-pressure booster pump, a high-pressure booster pump, an energy recovery device and a pressure center mother pipe. In the system, one part of low-pressure seawater is lifted by a low-pressure booster pump and a high-pressure pump and then enters a reverse osmosis device through a pressure center mother pipe, and the other part of low-pressure seawater is subjected to pressure exchange with concentrated seawater through an energy recovery device, is lifted by a high-pressure booster pump and then enters the reverse osmosis device; the outlet pressure can be adjusted according to the seawater quality so as to ensure the constant water yield, and the high-pressure pump adopts power frequency control. According to the pressure center type reverse osmosis seawater desalination system provided by the utility model, a single high-pressure pump can correspond to a plurality of sets of reverse osmosis devices, so that the efficiency of the high-pressure pump is improved; the reverse osmosis high-pressure pump adopts power frequency control, so that the high-pressure pump can be ensured to be in a high-efficiency interval, and the energy consumption of the reverse osmosis seawater desalination system can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sea water desalination technical field, specifically, it is a pressure center formula reverse osmosis sea water desalination system. BACKGROUND

[0002] Reverse osmosis sea water desalination is through semi-permeable membrane separation water and salt under high pressure to prepare fresh water. The concentrated brine produced by the system contains high pressure, and the energy recovery device can realize pressure exchange between the concentrated brine and seawater, recover the pressure in the concentrated brine, and reduce the power consumption of water production. With the continuous development of technology, reverse osmosis sea water desalination is increasingly widely used, but high operating energy consumption is one of the main factors restricting its development.

[0003] Due to the limitation of factors such as uniformity of water distribution, the maximum water production of a single reverse osmosis device is about 30,000 tons per day at present. For a super-large reverse osmosis sea water desalination plant, dozens of reverse osmosis devices need to be set up. In a conventional reverse osmosis system for sea water desalination, each reverse osmosis device needs to be matched with a high-pressure pump, and the high-pressure pump adopts frequency conversion control to adjust and control the water production of the system device. The efficiency of the water pump theoretically increases with the increase of water quantity, but the high-pressure pump of the conventional reverse osmosis sea water desalination system is restricted by the water production of a single reverse osmosis device, and cannot be matched with a large-flow high-efficiency pump type. The high-pressure pump of the reverse osmosis adopts frequency conversion control, which cannot ensure that the high-pressure pump operates in the high-efficiency working interval. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a pressure center formula reverse osmosis sea water desalination system.

[0005] Compared with the prior art, the utility model provides a pressure center formula reverse osmosis sea water desalination system, which comprises,

[0006] A pressure center main pipe;

[0007] A low-pressure seawater main pipe, which is communicated with the pressure center main pipe through a third pipeline, and a low-pressure booster pump and a high-pressure pump are arranged in series on the third pipeline, and the low-pressure seawater in the low-pressure seawater main pipe enters the pressure center main pipe after the water pressure is increased by the low-pressure booster pump and the high-pressure pump;

[0008] At least one reverse osmosis device, the seawater high-pressure inlet of the reverse osmosis device is communicated with the pressure center main pipe through a first pipeline; the seawater entering the pressure center main pipe through the third pipeline enters the reverse osmosis device through the first pipeline;

[0009] An energy recovery device, which is used for energy exchange between low-pressure seawater and concentrated brine; the low-pressure seawater main pipe is communicated with the low-pressure inlet of the energy recovery device through a second pipeline, and the energy recovery device exchanges pressure with the concentrated seawater therein and enters the seawater high-pressure inlet of the reverse osmosis device after being increased by the high-pressure booster pump.

[0010] According to the utility model, further, the low pressure booster pump adopts frequency control, adjusts export pressure according to seawater quality, guarantees constant water production.

[0011] According to the utility model, further, the high pressure pump adopts power frequency control, ensures that it is in high efficiency interval.

[0012] According to the utility model, further, the reverse osmosis device still has concentrated brine outlet, and the concentrated brine outlet is connected with the energy recovery device through a pipeline, and the concentrated brine in the reverse osmosis device is recovered to the energy recovery device to realize secondary utilization.

[0013] According to the utility model, further, still include water production main pipe, and the permeation device still has water production outlet, and the water production outlet is communicated with the water production main pipe through a pipeline, and the water production that handles qualified enters the water production main pipe through the pipeline.

[0014] According to the utility model, further, still include concentrated brine main pipe, and the energy recovery device still has the pipeline that communicates with the concentrated brine main pipe.

[0015] According to the utility model, further, the pressure center main pipe is provided with a pressure relief valve, when the flow of high pressure pump is greater than the water intake of reverse osmosis device, the excess seawater is reduced by the pressure relief valve and is discharged.

[0016] According to the utility model, further, the first pipeline still is provided with regulating valve, to balance the high pressure seawater intake flow of reverse osmosis device.

[0017] According to the utility model, further, the reverse osmosis device is greater than two, and is parallelly connected.

[0018] Compared with prior art, the utility model has the advantages of:

[0019] The utility model discloses through set up multiple shunt pipeline, improve the efficiency of high pressure pump, reduce energy consumption.

[0020] The utility model discloses can configure multiple reverse osmosis devices, and the high pressure pump flow is doubled, thereby improving operating efficiency, and reducing the power consumption of equivalent water production.

[0021] The low pressure booster pump of the utility model adopts frequency control, and cooperates with the high pressure booster pump of power frequency control, guarantees constant water production, makes the high pressure pump always operate in high efficiency interval, and improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is pressure center type reverse osmosis seawater desalination system flow schematic diagram (including multiple reverse osmosis devices) of the utility model.

[0023] Wherein, 1-RO device, 11-first pipeline, 12-regulating valve, 2-high pressure pump, 3-low pressure booster pump, 4-high pressure booster pump, 5-energy recovery device, 51-second pipeline, 6-pressure center main pipe, 7-low pressure seawater main pipe, 71-third pipeline, 8-product water main pipe, 9-concentrated brine main pipe, 10-pressure relief valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] Please refer to Figure 1 It is a pressure center type RO seawater desalination system process schematic diagram, and the pressure center type RO seawater desalination system comprises at least one RO device 1, the seawater high pressure inlet of the RO device 1 is communicated with the pressure center main pipe 6 through the first pipeline 11; the low pressure seawater main pipe 7 is communicated with the low pressure inlet of the energy recovery device 5 through the second pipeline 51, the low pressure seawater in the low pressure seawater main pipe 7 enters the energy recovery device 5 through the second pipeline 51, the energy recovery device 5 exchanges pressure with the concentrated seawater in it and enters the seawater high pressure inlet of the RO device 1 after being lifted by the high pressure booster pump 4; the low pressure seawater main pipe 7 is communicated with the pressure center main pipe 6 through the third pipeline 71, the low pressure booster pump 3 and the high pressure pump 2 are arranged in series on the third pipeline 71, the low pressure seawater in the low pressure seawater main pipe 7 enters the pressure center main pipe 6 after being lifted by the low pressure booster pump 3 and the high pressure pump 2, and then enters the RO device 1 through the first pipeline 11.

[0026] The energy recovery device 5 can adopt a PX pressure exchanger or a turbine type energy recovery device.

[0027] In the technical solution, the seawater is branched to enter the reverse osmosis device 1, improving the operation efficiency. The seawater after the pretreatment is qualified is transported through the low-pressure seawater mother pipe 7, and the seawater flow is divided into two parts, one part flows to the third pipeline 71, is preliminarily pressurized by the low-pressure booster pump 3, and then is lifted to the pressure required by the reverse osmosis device 1 by the high-pressure pump 2 to enter the pressure center mother pipe 6, and then enters the reverse osmosis device 1 through the first pipeline 11, and the other part of the seawater enters the energy recovery device 5 through the second pipeline 51, the energy recovery device 5 exchanges pressure with the concentrated seawater in the energy recovery device 5 and flows to the reverse osmosis device 1 after being lifted by the high-pressure booster pump 4. The low-pressure booster pump 3 is controlled by frequency conversion, and the outlet pressure can be adjusted according to the seawater quality to ensure the constant water production. The high-pressure pump 2 is controlled by power frequency to ensure that it is in the high-efficiency range of the water pump. Preferably, the low-pressure booster pump 3 is electrically connected with an external frequency converter, and the frequency converter is configured to adjust the operation frequency of the low-pressure booster pump according to the seawater quality to change the outlet pressure of the low-pressure booster pump, so as to maintain the constant system water production. The lift range of the low-pressure booster pump 3 is adjusted according to the system inlet water quality and the working state of the reverse osmosis device. The high-pressure pump 2 is connected with an external power frequency power supply.

[0028] The reverse osmosis device 1 also has a concentrated brine outlet and a water production outlet, wherein the concentrated brine outlet is connected with the energy recovery device 5 through a pipeline, the concentrated brine in the reverse osmosis device 1 is recovered to the energy recovery device 5 to realize secondary utilization, and the water production outlet is communicated with the water production mother pipe 8 through a pipeline, and the treated qualified water production enters the water production mother pipe 8 through the pipeline.

[0029] The energy recovery device 5 also has a pipeline communicated with the concentrated brine mother pipe 9, so as to inject the concentrated brine into the energy recovery device 5, improving the adjustment efficiency of the seawater quality.

[0030] The pressure center mother pipe 6 and the concentrated brine mother pipe 9 are also provided with a pressure relief valve 10 for pressure relief during system start, shutdown or maintenance, to ensure the safety of the system. When the flow of the high-pressure pump is greater than the required inlet water amount of the reverse osmosis device, the excess seawater can be discharged through the pressure relief valve.

[0031] The seawater high-pressure inlet of the reverse osmosis device 1 is provided with an adjusting valve 12 to balance the high-pressure seawater inlet flow of the reverse osmosis device 1.

[0032] In the embodiment of the present application, three reverse osmosis devices 1 are arranged in parallel, and the high-pressure seawater inlet flow is adjusted by the respective adjusting valves 12 to make the water amount entering each reverse osmosis device 1 the same. By additionally arranging the reverse osmosis devices, the flow of the high-pressure pump can be improved, and the efficiency of the high-pressure pump can also be improved. According to the required water production, multiple sets of reverse osmosis devices 1 can be arranged, and the flow of a single low-pressure booster pump 3 and a high-pressure pump 2 can correspond to multiple sets of reverse osmosis devices 1, so as to be conducive to improving the efficiency of the high-pressure pump 2. Taking a single set of water production of 30,000 tons / day reverse osmosis device as an example, if one high-pressure pump is arranged for each set of reverse osmosis device, the flow of the high-pressure pump is about 1250 m3 If each three sets of reverse osmosis devices is matched with one high-pressure pump, the flow of the high-pressure pump will be expanded three times, about 3750m 3 / h, and the water pump efficiency can reach 88%.

[0033] The application is that the qualified seawater is divided into two ways through the low-pressure seawater mother pipe. One way is sequentially lifted to the required high pressure of the system through the low-pressure booster pump controlled by frequency conversion and the high-pressure pump controlled by working frequency, and enters the pressure center mother pipe. The other way enters the energy recovery device, exchanges pressure with the high-pressure concentrated brine in the energy recovery device, becomes medium-high pressure seawater after recovering energy, is boosted to the required pressure of the system through the high-pressure booster pump, and enters the reverse osmosis device. When the reverse osmosis device is multiple, the high-pressure seawater gathered in the pressure center mother pipe is evenly distributed to each corresponding reverse osmosis device through the first pipe with the adjusting valve. In the reverse osmosis device, the seawater is desalinated under the action of pressure, the produced fresh water enters the product water mother pipe, and the discharged high-pressure concentrated brine enters the energy recovery device for recycling.

[0034] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

Claims

1. A pressure center type reverse osmosis seawater desalination system, characterized by, The application relates to a seawater desalination system. The seawater desalination system comprises a pressure center main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure seawater main pipe, a low-pressure ​ ​ ​ ​ 2. The pressure center RO desalination system of claim 1, wherein, ​ 3. The pressure center RO desalination system of claim 1, wherein, ​ 4. The pressure center RO desalination system of claim 1, wherein, ​ 5. The pressure center RO desalination system of claim 1, wherein, ​ 6. The pressure center RO desalination system of claim 1, wherein, ​ 7. The pressure center RO desalination system of claim 1, wherein, ​ 8. The pressure center RO desalination system of claim 1, wherein, ​ 9. The pressure center RO desalination system of claim 1, wherein, ​

Images