Boiler feedwater treatment method and treatment system related to reuse of reclaimed water

Abstract

The invention provides a boiler feedwater treatment method and a treatment system related to the reuse of reclaimed water. The treatment method comprises the following steps: (1) carrying out self-cleaning filtration on raw water with a conductivity of 500-1700muS / cm and then carrying out microfiltration, thus obtaining water with a fouling index being lower than 3, turbidity being equal to or lower than 0.05NTU and suspended solid concentration being smaller than 1mg / L; (2) carrying out pre-desalination through primary reverse osmosis and secondary reverse osmosis on the water obtained by microfiltration in step (1), thus obtaining water with the conductivity being smaller than 20muS / cm; and (3) by adopting a continuous electrodeionization method, carrying out deep desalination on the primarily desalinated water obtained by pre-desalination in step (2), thus obtaining desalinated water with conductivity being smaller than or equal to 0.2muS / cm. The treatment method is efficient and environment-friendly and has various advantages in the aspects of investment, operation and maintenance.

Description

technical field [0001] The invention relates to a boiler make-up water treatment method and a treatment system related to middle water reuse. Background technique [0002] With the continuous expansion of production capacity and continuous investment in new production lines, the demand for water resources is also increasing. Under the situation of increasingly scarce water resources, a strict new water consumption index per ton of steel has been formulated. To this end, the company has increased its efforts in sewage treatment and reclaimed water reuse. In this context, the research and development of the 2×300MW generating unit boiler make-up water treatment system for the supporting project of the 1.5 million tons stainless steel project naturally set the raw water on the reclaimed water. [0003] The traditional water source of boiler make-up water is diverted water from the Yellow River, whose composition is basically equivalent to domestic water—tap water, with a cond...

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Problems solved by technology

Coagulation, clarification, filtration to remove suspended solids and colloids, ion exchange technology to remove various salt ions in water, but there are two main problems: one is the efficiency of the pretreatment system is not high, the process is long, the area is large, and the effect unstable

Second, the ion exchange resin needs to be regenerated with high-concentration acid and alkali, and a large amount of acid-base wastewater is discharged. Especially for reclaimed water with a salt content exceeding 1000mg / L, the ion exchange regeneration is very frequent, causing serious environmental pollution and high operating costs.

[0005] But so far, there is no technology that can combine the advantages of the above three technologies to achieve higher effects, stability, energy saving, and environmentally friendly treatment of water sources containing high-salt reclaimed water, so that reclaimed water can be treated To be able to be used for boiler make-up water

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