Reverse osmosis container-type sea water desalination plant and water producing process thereof

Abstract

The invention discloses a reverse osmosis container-type sea water desalination plant and a water producing process thereof. The reverse osmosis container-type sea water desalination plant comprises a container, a pre-treatment system, a sea water desalination system, an automatic control system, a reagent feeding system, a sea water inlet and a produced-water outlet, wherein the container is located outside; the pre-treatment system, the sea water desalination system, the automatic control system and the reagent feeding system are arranged in the container in sequence in a matching manner, and the sea water inlet and the produced-water outlet are formed in the same side of the container. The process flow sequences are shown as follows: taking source sea water, initially filtering by a sand filter, precisely filtering by a security filter, performing reverse osmosis desalination, supplying water by a water producing pump and feeding reagents by a supporting reagent feeding system; a reverse osmosis system also comprises an energy recovery plant and a chemical cleaning/fresh water replacement device, wherein the energy recovery plant is used for recovering energy, and the chemical cleaning/fresh water replacement device is used for performing cleaning or replacement. The reverse osmosis container-type sea water desalination plant and the water producing process thereof disclosed by the invention have the advantages that the energy conversion efficiency is high; the structure is compact; the occupied area is small, and while a high-pressure strong brine emission risk is lowered, the system investment and operating cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of water resources treatment, in particular to a reverse osmosis container-type seawater desalination device and a water production process thereof. Background technique [0002] The shortage of fresh water resources has developed into a global problem. The situation of shortage of fresh water resources in my country is also severe, especially in some islands and brackish water areas. The shortage problem is of great significance to social development. [0003] Reverse osmosis seawater desalination is currently the main method of seawater desalination because of its advantages such as simple equipment, convenient operation, no phase change, high treatment efficiency and low energy consumption. [0004] Most of the existing seawater desalination plants need to build a factory building, and the equipment is fixedly installed in the factory building, which has high requirements for construction and site. Some ...

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Problems solved by technology

[0015] Problems in the first embodiment: 1. The concentrated brine after reverse osmosis treatment contains a higher pressure. Although the concentrated brine is reflowed in the embodiment, which reduces a part of the water intake, the continuous reflux of the concentrated brine will make the reverse flow The salt content of the influent water of the permeable membrane device will continue to increase, and the operating pressure of the system will also continue to increase, thereby increasing the operating cost of the entire treatment system, and the water quality will also decline

2. The high pressure of the concentrated brine is not utilized, which wastes a lot of energy, and the direct discharge of the concentrated brine without depressurization will be more dangerous

[0016] Problems in the second embodiment: 1. The concentrated brine treated by the reverse osmosis membrane device passes through the energy recovery device for energy recovery. Compared with the full discharge of concentrated brine or the return of concentrated brine, the energy consumption of the system is reduced, but the adopted The recovery efficiency of the energy recovery device is not high. At present, the efficiency of turbine energy recovery is up to 50-70%. Compared with the energy recovery device with higher recovery efficiency, it will inevitably increase the operating cost of the system.

2. There is no chemical cleaning device in the system. After the equipment runs for a long time, the reverse osmosis membrane will be polluted, which will affect the water quality of the effluent. At the same time, the inlet pressure of the reverse osmosis system will also increase, resulting in an increase in operating costs.

3. If the system stops suddenly because there is no fresh water replacement system, it will cause damage to the reverse osmosis membrane and affect the service life of the reverse osmosis membrane

[0017] Problems in the third embodiment: 1. Although the energy recovery device used in the embodiment has a conversion efficiency of 94%-96%, it needs to be equipped with an energy recovery booster pump to make the pressure match the outlet pressure of the high-pressure pump

For containers with limited space, more equipment will inevitably increase the layout space

2. There is no chemical cleaning device in the system. After the equipment runs for a long time, it will cause membrane pollution and affect the water quality of the effluent.

3. There is no fresh water replacement device in the system, if the fresh water replacement is not carried out during sudden shutdown, the membrane will be damaged

4. All equipment with a product water output of 10m3 / h is only arranged in a 6m×2.4m×2m shelter, and operators are not required to operate on site

[0018] In the process of realizing the present invention, the inventors found that at least there are defects such as poor environmental protection, high operating cost and inconvenient operation in the prior art

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