High-water-yield treatment method and device for boiler feed water

Abstract

The invention discloses a high-water-yield treatment method for boiler feed water. The high-water-yield treatment method comprises the following steps of (1), conveying all washing wastewater of sand filtering, carbon filtering and ultrafiltration systems into a washing water tank, and removing organisms of an alga and the like in the washing wastewater under the action of an ultraviolet sterilization device in a pipeline; (2), afterwards, making the washing wastewater pass through a high-density sedimentation pool; (3), afterwards, making the washing wastewater pass through a high-flux security filter and enter a newly added ultrafiltration system again for treatment; (4), making concentrated water produced by the primary reverse osmosis and the secondary reverse osmosis in a membrane-method power-plant boiler water treating device enter a newly added ultrafiltration water producing box and mixed with the wastewater treated through the newly added ultrafiltration system in the step (3), making mixed wastewater enter an electrodialysis reversal device, decreasing the salt content of the wastewater to make the wastewater meet the inlet water requirement of a reverse osmosis device, making outlet water of an electrodialysis reversal desalination chamber enter the ultrafiltration water producing box to carry out cyclic treatment, and outwards discharging outlet water of an electrodialysis reversal condensation chamber. The utilization rate of raw water is improved in a process; the device is simple in structure; the capital expenditure is low.

Description

[0001] Technical field: [0002] The invention relates to the technical field of water treatment, in particular to a boiler feed water treatment method with a high water production rate and a device thereof. The water production rate of the boiler feed water process is provided by recycling cleaning wastewater and concentrated water produced by reverse osmosis. [0003] Background technique: [0004] At present, the power generation of thermal power plants is realized by heating the boiler to generate water vapor to drive the steam turbine to rotate, and then converting the generated mechanical energy into electrical energy. The used steam is sent to the condenser, cooled and then sent to the boiler for reuse. In order to prevent scaling, salt accumulation and corrosion in the boiler water vapor system, the boiler water needs to undergo strict treatment to meet the water quality standards for safe operation. The process of "pretreatment process (sand filter + carbon filter) + ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a boiler feed water treatment system with a high water production rate, and solve the problem of low raw water utilization in the existing membrane boiler water treatment process, especially the membrane boiler water treatment device for power plants Disposal of medium cleaning wastewater and reverse osmosis concentrated water

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