Discharging method and device for non-condensable gas of pressure boiler

Abstract

The present invention discloses discharging method and apparatus for non-condensable gas of autoclave. The apparatus includes autoclaves and flash evaporator, and the non-condensable gas is discharged from the previous autoclave to the next one successively until the last one, discharged from the last autoclave to the flash evaporator via material pipeline, and discharged from the flash evaporator to atmosphere. The present invention has the full operation of autoclaves, raised heat efficiency and prolonged lixiviation and reaction time, and can avoid the abrupt rushing out of non-condensable gas to ensure safe and stable production, prolong the service life of the valves and lower production cost.

Description

Technical field: [0001] The invention relates to a method and a device for discharging non-condensable gas from an autoclave used for dissolving slurry in alumina production. Background technique: [0002] In the existing alumina ore dissolution technology, the discharge method of non-condensable gas in the dissolution autoclave is artificial intermittent discharge: a non-condensable gas pipe is arranged on the autoclave, and a non-condensable gas pipe is connected below the non-condensable gas pipe. The discharge funnel, the worker will open the exhaust valve regularly, so that the non-condensable gas in the autoclave will be discharged into the discharge funnel. Since the pressure in the autoclave is as high as 52 kg, the temperature of the pulp in the autoclave is 260 ° C, and the discharged The gas carries part of the slurry and rushes into the discharge funnel at a very fast speed. The pipeline vibrates greatly every time it is exhausted, the valve wears seriously, and ...

AI Technical Summary

Problems solved by technology

[0002] In the existing alumina ore dissolution technology, the discharge method of non-condensable gas in the dissolution autoclave is artificial intermittent discharge: a non-condensable gas pipe is arranged on the autoclave, and a non-condensable gas pipe is connected below the non-condensable gas pipe. The discharge funnel, the worker will open the exhaust valve regularly, so that the non-condensable gas in the autoclave will be discharged into the discharge funnel. Since the pressure in the autoclave is as high as 52 kg, the temperature of the pulp in the autoclave is 260 ° C, and the discharged The gas carries part of the slurry and rushes into the discharge funnel at an extremely fast speed. The pipeline vibrates greatly every time it is exhausted, the valve wears seriously, and the slurry is easily splashed and leaked, which is not conducive to the safe and stable operation of production.

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