Water treatment method and device using aluminum oxide secondary condensation water as make-up water of power plant

Abstract

The invention discloses a water treatment method and device using aluminum oxide secondary condensation water as make-up water of power plant. The water treatment method comprises the following steps: reducing the temperature of secondary condensation water from an aluminium oxide factory, degrading pollutants, flocculating, performing floatation, filtering and performing ion exchange, wherein after a floatation device is used for primary aluminum removal, a two-medium mechanical filter is used to remove residual aluminum; the mechanical filter adopts anthracite coal and quartz sand as filter materials and is used to remove most of aluminium in water passing through the floatation device so that the content of aluminium in water meets the standard that the content of aluminium is less than 0.3 mg / L and the problem that when the content of aluminium is too high, the subsequent ion exchange resin is polluted, is avoided. The filtered water of which aluminium content is less than 0.3 mg / L enters a cation exchanger, a carbon dioxide remover, an anion exchanger and a mixed ion exchanger in turn, the effluent can be used as the make-up water of a high-pressure boiler, and water processed by the device completely meets the make-up water standard of the high-pressure boiler.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a condensed water treatment method and device, in particular to a water treatment method and device for using alumina secondary condensed water as power plant make-up water. Background technique [0002] In the 1980s, secondary condensed water was only limited to the level of miscellaneous water used in domestic production and production, and there were few researches on reuse technology. After the 1990s, secondary condensed water was gradually used for high-quality and high-quality miscellaneous water, and there were many researches on reuse technology, and a lot of progress was made in application. Up to now, there have been instances in China where the secondary condensate has been treated and used as feed water for medium and low pressure boilers. However, through investigation, it is known that the project did not conduct a full analysis of the water quality of the secondary co...

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Problems solved by technology

[0006] (2) The content of CODMn in the water quality index is still high, and there is still a certain amount of organic pollution. If it is not completely removed, it will have a serious impact on the subsequent process

[0007] (3) Although the oil content index in the water was not detected, it should be admitted that the water quality report is only a sample result, because there must be mechanical equipment such as water pumps, fans, mixers, etc. in the production operation that must be in contact with the secondary condensed water, and there are also equipment Potential oil pollution during maintenance

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