Single set of reverse osmosis membrane group equipment of large-scale seawater desalination system

Abstract

The utility model relates to single-set reverse osmosis membrane group equipment of a large seawater desalination system. The single-set reverse osmosis membrane group equipment comprises a seawater header pipe, a reverse osmosis membrane group, an energy recovery device, a reverse osmosis membrane group water inlet pipe, an energy recovery device water inlet pipe, a reverse osmosis membrane group concentrated water return pipe, a high-pressure seawater pipeline, a mixing pipeline, a concentrated water discharge pipe and a water production pipe, the reverse osmosis membrane group, the energy recovery device and each pipeline are reasonably arranged, and the occupied area of a single set of reverse osmosis membrane group can be compressed to the minimum, so that the investment cost in the earlier stage is saved, the water production scale is large, the operation is stable and reliable, and the energy consumption is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to seawater desalination device technical field especially large -scale seawater desalination system single set reverse osmosis membrane group equipment. BACKGROUND

[0002] The shortage of water resources has become a global problem, in order to deal with the situation of water resource shortage, seawater desalination technology gradually matures and becomes an important fresh water source approach. Heat method and membrane method are the most popular two seawater desalination methods at present, and reverse osmosis membrane method gradually becomes the mainstream technology in seawater desalination industry because of its small footprint, low energy consumption, easy installation and maintenance and other advantages. Through the reverse osmosis membrane method technology desalination seawater as industrial and domestic water, it requires that reverse osmosis membrane group has relatively large water production scale, relatively stable operation equipment and device to meet the fresh water supply of industrial water and domestic water in the region, however, at present, single reverse osmosis equipment mostly has small water production scale, cannot reach the daily water supply demand of large -scale seawater desalination system, to meet the water supply demand, can only expand the production scale of reverse osmosis membrane group, uses multiple small -scale water production reverse osmosis membrane group, accordingly, will expand the footprint, increases equipment, pipeline, valve etc., increases investment cost. SUMMARY

[0003] To solve the above technical problem, the utility model provides a kind of large -scale seawater desalination system single set reverse osmosis membrane group equipment, water production scale is big, and it is stable and reliable to operate, and energy consumption is low.

[0004] The utility model adopts the following technical scheme to realize: large -scale seawater desalination system single set reverse osmosis membrane group equipment including seawater main pipe, reverse osmosis membrane group, energy recovery device, reverse osmosis membrane group water inlet pipe, energy recovery device water inlet pipe, reverse osmosis membrane group concentrated water backflow pipe, high pressure seawater pipeline, mixed pipeline, concentrated water discharge pipe, water production pipe, the water supply pump is installed on the seawater main pipe, and the end water outlet of seawater main pipe is connected with the water inlet pipe of reverse osmosis membrane group and energy recovery device water inlet pipe simultaneously, the lower end water inlet of energy recovery device water inlet pipe is connected with energy recovery device, the water inlet port of reverse osmosis membrane group concentrated water backflow pipe is connected with reverse osmosis membrane group, and the water outlet port of reverse osmosis membrane group concentrated water backflow pipe is connected with the upper end water inlet of energy recovery device, the water inlet port of high pressure seawater pipeline is connected with the upper end water outlet of energy recovery device, and the water outlet port of high pressure seawater pipeline is simultaneously connected with the water outlet port of reverse osmosis membrane group water inlet pipe and the water inlet end of mixed pipeline, the water outlet end of mixed pipeline is connected with the water inlet side of reverse osmosis membrane group, the lower end water outlet of energy recovery device is connected with concentrated water discharge pipe, and the water outlet side of reverse osmosis membrane group is connected with water production pipe.

[0005] The high pressure pump is installed on the reverse osmosis membrane group water inlet pipe.

[0006] The booster pump is installed on the high pressure seawater pipeline.

[0007] The water production pipe comprises a front water production pipe and a rear water production pipe, the front water production pipe is connected to the water outlet side of the front end of the reverse osmosis membrane group, and the rear water production pipe is connected to the water outlet side of the rear end of the reverse osmosis membrane group.

[0008] The chemical cleaning inlet pipe is connected to the mixing pipe and the energy recovery device inlet pipe, the chemical cleaning circulation pipe is connected to the rear water production pipe and the reverse osmosis membrane group concentrated water return pipe, and valves are arranged on the chemical cleaning inlet pipe and the chemical cleaning circulation pipe.

[0009] Valves are arranged on the seawater main pipe, the reverse osmosis membrane group inlet pipe, the energy recovery device inlet pipe, the reverse osmosis membrane group concentrated water return pipe, the concentrated water discharge pipe and the water production pipe.

[0010] The seawater main pipe is provided with a scale inhibitor and a reducing agent dosing point at the inlet of the water pump.

[0011] Compared with the prior art, the beneficial effects of the present application are that the reverse osmosis membrane element adopts a multi-section arrangement mode, is highly integrated, and can realize large-scale seawater desalination in a very small land area; the energy recovery device is used to recover the energy of the concentrated water with high pressure in the reverse osmosis membrane group, thereby greatly reducing the operation cost of the reverse osmosis device; and through the reasonable arrangement of the reverse osmosis membrane group, the energy recovery device and the pipe, the land area occupied by a single reverse osmosis membrane group can be compressed to the minimum, thereby saving the initial investment cost. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0013] Main symbol explanation:

[0014] 1, scale inhibitor and reducing agent dosing point; 2, water pump; 3, seawater main pipe; 4, reverse osmosis membrane group inlet pipe; 5, high-pressure pump; 6, valve; 7, chemical cleaning inlet pipe; 8, front water production pipe; 9, reverse osmosis membrane group; 10, rear water production pipe; 11, mixing pipe; 12, chemical cleaning circulation pipe; 13, booster pump; 14, high-pressure seawater pipe; 15, reverse osmosis membrane group concentrated water return pipe; 16, concentrated water discharge pipe; 17, energy recovery device; 18, energy recovery device inlet pipe. DETAILED DESCRIPTION

[0015] In the following, the present application will be further described in combination with the drawings and specific embodiments, and it should be noted that the embodiments described below or the technical features between the embodiments can be combined in any manner to form new embodiments without conflict.

[0016] Embodiment:

[0017] Please combine Figure 1The large seawater desalination system of the embodiment comprises a seawater main pipe 3, a reverse osmosis membrane group 9, an energy recovery device 17, a reverse osmosis membrane group water inlet pipe 4, an energy recovery device water inlet pipe 18, a reverse osmosis membrane group concentrated water return pipe 15, a high-pressure seawater pipe 14, a mixing pipe 11, a concentrated water discharge pipe 16, and a water production pipe. The seawater main pipe is provided with a water supply pump 2. The seawater main pipe 3 is connected to the reverse osmosis membrane group water inlet pipe 4 and the energy recovery device water inlet pipe 18. The energy recovery device water inlet pipe 18 is connected to the lower end inlet of the energy recovery device 17. The reverse osmosis membrane group concentrated water return pipe 15 is connected to the reverse osmosis membrane group 9. The outlet of the reverse osmosis membrane group concentrated water return pipe 15 is connected to the upper end inlet of the energy recovery device 17. The inlet of the high-pressure seawater pipe 14 is connected to the upper end outlet of the energy recovery device 17. The outlet of the high-pressure seawater pipe 14 and the outlet of the reverse osmosis membrane group water inlet pipe 4 are connected to the inlet of the mixing pipe 11. The outlet of the mixing pipe 11 is connected to the water inlet side of the reverse osmosis membrane group 5. The lower end outlet of the energy recovery device 17 is connected to the concentrated water discharge pipe 16. The water outlet side of the reverse osmosis membrane group 9 is connected to the water production pipe.

[0018] The reverse osmosis membrane group water inlet pipe 4 is provided with a high-pressure pump 5.

[0019] The high-pressure seawater pipe 14 is provided with a booster pump 13.

[0020] The water production pipe comprises a front water production pipe 8 and a rear water production pipe 10. The front water production pipe 8 is connected to the water outlet side of the front end of the reverse osmosis membrane group 9. The rear water production pipe 10 is connected to the water outlet side of the rear end of the reverse osmosis membrane group 9.

[0021] The mixing pipe 11 and the energy recovery device water inlet pipe 18 are both connected to a chemical cleaning water inlet pipe 7. The rear water production pipe 10 and the reverse osmosis membrane group concentrated water return pipe 15 are both connected to a chemical cleaning circulation pipe 12. The chemical cleaning water inlet pipe 7 and the chemical cleaning circulation pipe 12 are both provided with valves.

[0022] The seawater main pipe 3, the reverse osmosis membrane group water inlet pipe 4, the energy recovery device water inlet pipe 18, the reverse osmosis membrane group concentrated water return pipe 15, the concentrated water discharge pipe 16, and the water production pipe are all provided with valves 6.

[0023] The seawater main pipe 3 is provided with a scale inhibitor and a reducing agent dosing point 1 at the inlet of the water supply pump.

[0024] The reverse osmosis membrane element adopts a multi-section arrangement mode, is highly integrated, and can realize large-scale seawater desalination work in a small footprint. The reverse osmosis membrane elements are arranged in a multi-section series in a single membrane shell, and the membrane shells are arranged in parallel in the vertical and horizontal directions. The membrane shell spacing is small. In the same space range, the number of membrane elements can be increased according to the arrangement mode, thereby greatly improving the water production capacity of the reverse osmosis membrane group equipment. In a large seawater desalination project of 100,000 tons or more, the water production capacity of a single reverse osmosis membrane group equipment is greatly improved, which means that the number of reverse osmosis membrane groups can be reduced, thereby reducing the fixed asset investment of water pumps and pipelines, and reducing the project footprint. The high integration of the reverse osmosis membrane element can optimize the system pressure distribution, enable the system to operate at a lower energy consumption, improve the energy utilization efficiency, and thereby reduce the operating cost.

[0025] The seawater is lifted by the feed pump and is divided into two paths. One path is lifted by the high-pressure pump and enters the reverse osmosis membrane group. The other path enters the energy recovery device. The seawater entering the energy recovery device exchanges energy with the high-pressure concentrated water flowing back in the reverse osmosis membrane group. The low-pressure seawater becomes high-pressure seawater, is lifted by the booster pump, and is combined with the water discharged by the high-pressure pump to enter the reverse osmosis membrane group through the mixing pipeline. The high-pressure concentrated water becomes low-pressure concentrated water and is discharged through the concentrated water discharge pipeline. The water produced by the reverse osmosis membrane group is divided into front water and rear water, which enter the water production tank through their respective pipelines. According to the characteristics of the reverse osmosis membrane, a scale inhibitor and a reducing agent dosing point are arranged at the inlet of the reverse osmosis membrane group feed pump, and are continuously dosed to prevent the membrane element from scaling and being oxidized, and to ensure the normal use of the reverse osmosis membrane group. The above process is the normal working process of the reverse osmosis membrane group.

[0026] The chemical cleaning inlet pipe and the chemical cleaning circulation pipe are arranged to realize the daily flushing and maintenance of the membrane group by switching the valves of the reverse osmosis membrane group.

[0027] In the entire reverse osmosis process, many monitoring points of operating parameters are arranged. The flow rate and pressure obtained by real-time monitoring are used to start and stop the reverse osmosis membrane group. When the reverse osmosis equipment is normally operating, the real-time monitoring of the flow rate and pressure can also be used to find problems in time and ensure the normal operation of the reverse osmosis membrane group.

[0028] Real-time monitoring points of orp, ph, and residual chlorine are arranged at the inlet of the reverse osmosis feed pump to monitor whether the water quality meets the operating parameter range of the reverse osmosis membrane, and to ensure the normal operation of the reverse osmosis device and protect the reverse osmosis membrane element. Conductivity monitoring points are arranged on the inlet and outlet pipelines of the reverse osmosis membrane group to monitor the water quality of the inlet and outlet of the reverse osmosis membrane group in real time. The desalination rate data of the reverse osmosis device can be obtained from the monitoring values, which can be used as a basis for whether to perform chemical cleaning on the membrane group.

[0029] The start and stop process of the reverse osmosis equipment is as follows:

[0030] Start: start the water pump→ start the booster pump→ close the membrane group and pipeline exhaust valve→ start the high-pressure pump→ the equipment reaches the production operation

[0031] Stop: stop the high-pressure pump→ stop the booster pump→ stop the water pump→ open the membrane group exhaust valve to release pressure

[0032] The above embodiment is only a preferred embodiment of the present application, and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and replacements made by those skilled in the art on the basis of the present application shall belong to the scope of protection of the present application.

Claims

1. A large-scale seawater desalination system single set of reverse osmosis membrane group equipment, characterized in that, The seawater main pipe, the reverse osmosis membrane group, the energy recovery device, the reverse osmosis membrane group water inlet pipe, the energy recovery device water inlet pipe, the reverse osmosis membrane group concentrated water return pipe, the high-pressure seawater pipe, the mixing pipe, the concentrated water discharge pipe and the water production pipe are provided with valves.

2. The large-scale seawater desalination system single set of reverse osmosis membrane group equipment of claim 1, wherein, The high-pressure pump is installed on the reverse osmosis membrane group water inlet pipe.

3. The large-scale seawater desalination system single set of reverse osmosis membrane group equipment of claim 1, wherein, The booster pump is installed on the high-pressure seawater pipe.

4. The large-scale seawater desalination system single set of reverse osmosis membrane module apparatus according to claim 1, characterized in that, The water production pipe comprises a front water production pipe and a rear water production pipe.

5. The large-scale seawater desalination system single set of reverse osmosis membrane group equipment of claim 4, wherein, The mixing pipe and the energy recovery device water inlet pipe are connected with chemical cleaning water inlet pipes, and the rear water production pipe and the reverse osmosis membrane group concentrated water return pipe are connected with chemical cleaning circulation pipes.

6. The large-scale seawater desalination system single set of reverse osmosis membrane module apparatus according to claim 1, characterized in that, The seawater main pipe, the reverse osmosis membrane group water inlet pipe, the energy recovery device water inlet pipe, the reverse osmosis membrane group concentrated water return pipe, the concentrated water discharge pipe and the water production pipe are provided with valves.

7. The large-scale seawater desalination system single set of reverse osmosis membrane module apparatus according to claim 1, characterized in that, The seawater main pipe is provided with a scale inhibitor and a reducing agent dosing point at the inlet of the water pump.

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