Condensate polishing mixed bed anion-cation resin separation filter and control method thereof

Abstract

The invention relates to a condensate polishing mixed bed cation-anion resin separation filter. The filter comprises a resin pot, a main water inlet tube, and a resin inlet tube, a first resin outlet tube, a second resin outlet tube and a third resin outlet tube which are sequentially connected with the vertical side of the resin pot from top to bottom, the main water inlet tube is branched into a top water inlet tube and a bottom water inlet tube, the top water inlet tube is connected with a backwashing water outlet tube, the top water inlet tube is connected with the vertical top of the resin pot, and the bottom water inlet tube is connected with the vertical bottom of the resin pot. The invention also relates to a control method of the filter. The method sequentially comprises the following steps: 1, introducing resins into the resin pot; 2, backwashing the introduced resins; 3, leading out anion resins; 4, leading out middle-layer resins; and 5, regenerating to lead out cation resins. In the invention, the cation resin separation rate is increased, the mixed bed running time is prolonged, the acid and alkali consumption amounts are reduced, and the wastewater discharge is reduced.

Description

technical field [0001] The invention relates to an anion-yang resin separation filter and a control method thereof, in particular to a condensate fine treatment mixed-bed anion-yang resin filter and a control method thereof. Background technique [0002] The first phase of Tianwan Nuclear Power Plant consists of two NPP91 / WWER-1000 units designed and supplied by Russia, with a total rated power of 2×1060MW and a design life of 40 years. The two units are respectively equipped with a set of condensate fine treatment devices. The function of the device is to purify the condensate water quality and remove metal impurities such as metal corrosion products and ion impurities. [0003] When the yin and yang resins are separated, the device needs to enter water from the top and the middle, three 90-degree pipes enter water, there is no water distribution device for the water inlet, and the fourth 90-degree pipe exits the resin; the total flow of water is 14.7kg / s, where the upper...

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Problems solved by technology

[0008] (3) Due to the structure of the anion-yang resin backwash separation tower itself, the measured anion-yang resin separation rate is only 88%

[0009] (4) The separation rate of anion and cation resins is low, which will lead to short operation period of the mixed bed, high regeneration frequency, and large waste water discharge. It will also release the chloride ions brought in by the anion resin during regeneration into the secondary loop system, causing the steam generator in the power station to Sewage deviation

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