Full forced circulation type evaporator

Abstract

The invention discloses a completely mandatory circulation evaporator which comprises a boiling chamber (5) and a heating chamber (4); the boiling chamber (5) is provided with a feed inlet (1), a feed outlet (2), and a secondary steam export (7); the heating chamber (4) is provided with a heating tube array (13); the upper parts of the boiling chamber (5) and the heating chamber (4) are connected by an upper circulating tube (9), and the lower parts thereof are connected by a lower circulating tube (3); the lower circulating tube (3) at the lower part of the boiling chamber (5) is connected with a forced circulation pump (2); the internal upper part of the boiling chamber (5) is provided with a deflection baffle (8) and a flow around baffle (10); the internal lower part of the boiling chamber (5) is provided with a extinction vortex cross baffle (11); and a guiding plate (12) is arranged in the lower circulating tube (3) which is connected with the lower part of the heating chamber (4). The invention is used for transforming the original external heating type natural circulation (tube type) evaporator (four-effect countercurrent operation), has saved investment and rapid efficiency, as well as high production capacity, and is difficult to cause the heating tube to be fouled and obstructed.

Description

technical field [0001] The invention relates to an evaporation device in alumina production. Background technique [0002] In the current alumina production process, the equipment used for evaporating mother liquor generally includes: plate falling film evaporator, tube falling film evaporator, external heating natural circulation (tube) evaporator and forced circulation (tube) evaporator )Evaporator. Among them: falling film evaporator and forced circulation evaporator have high production capacity and low steam consumption; externally heated natural circulation (tube) evaporator has low production capacity and high steam consumption. However, due to the high investment cost and long construction period of the falling film evaporator, it is suitable for new evaporators. The forced circulation evaporator is suitable for the transformation of the old external heating natural circulation tube evaporator, which will not affect the production, but also has the advantages of lo...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a full forced circulation evaporator structure so that the existing evaporation equipment can be modified without affecting the alumina production process and environment, so as to overcome the low production capacity of the existing technology , high steam consumption, high cost, etc.

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