Water washing method for carbonization tower and device thereof

Abstract

The invention discloses a water washing method for carbonization towers, which is implemented through a device for washing a carbonization tower with water. The washing water in a first-stage recovery pond is heated up to 30 DEG C; the heated pond water is pumped into a carbonization tower, followed by circular tower washing for 8-10 hours; after the tower washing is completed, the pond water of the first-stage recovery pond is fully pumped into a second-stage recovery pond; in the second-stage recovery pond, the hot pond water from the first-stage recovery pond is mixed with the cold water in the pond and cooled, and the fouling deposits; and when the next carbonization tower is washed with water, the cold water in the second-stage recovery pond is pumped into the first-stage recovery pond; and the above steps are repeated. The method disclosed in the invention can completely remove the fouling in the carbonization towers, can reduce the consumption of flowing water by more than 500 m<3> / (tower.times), and can reduce the discharge of waste water containing ammonia nitrogen by 500 m<3> / (tower.times). The tower washing water can be recycled and reused. When the tower washing water is concentrated close to the system components and the system mother liquid is contracted, the tower washing water is incorporated into a united alkali production system, with significant environmental benefits.

Description

technical field [0001] The invention relates to soda ash production equipment, in particular to a water washing method and device for a carbonization tower. Background technique [0002] In the production of soda ash, the carbonation reaction of ammonia mother liquor II absorbing carbon dioxide and producing sodium bicarbonate occurs in the carbonization tower. Because sodium bicarbonate and crystals adhere to the carbonization tower's cap, faceplate, bottom cooling water tubes, carbonization tower dead corners, etc., forming scars, these scars affect the absorption and cooling efficiency, and need to be cleaned and dissolved with ammonia mother liquor II The inner scar block, the carbonization tower is called the cleaning tower. After the carbonization tower is cleaned, it is changed to a soda production operation, and the carbonization tower is called a soda production tower. [0003] Due to the influence of factors such as tower conditions, mother liquor composition, op...

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Problems solved by technology

[0005] When using the method of "washing the carbonization tower with direct current water" to wash the scab inside the carbonization tower, because the tower washing water is directly discharged into the trench, the ammonia nitrogen content in the groundwater is high and the environment is seriously polluted

When the scab in the carbonization tower is washed with water in the way of "boiling and washing the carbonization tower", it is easy to cause the rust in the carbonization tower to peel off and cause a good alkali. At the same time, due to the high steam pressure used, overpressure accidents are prone to occur

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