Methods for recycling process wastewater streams

B - Operations – Transporting – 01 – D

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B01D 1/02 (2006.01) B01D 1/26 (2006.01) C02F 1/04 (2006.01)

Patent

CA 2408324

This invention provides cost-effective alternatives to reduce the cost associated with customary blowdown (1) from steam generating equipment (100). By selectively recycling process blowdown streams using secondary vaporizers (200), the net result is a partial replacement of wastewater stream with almost an equivalent quantity of clean steam condensate. The heat transfer is carried out by indirect contact devices, such as shell and tube heat exchanger and the like, without mixing of the two process streams to allow condensate recovery while avoiding cross contamination. This invention carries economic as well as environmental credits. A condensate recovery apparatus (42) can be designed to enable easy connection to existing equipment already in service, as well as easy removal, without causing process disruption.

Cette invention a trait à des solutions de rechange efficaces par rapport au coût, permettant de diminuer le coût lié à la purge (1) habituelle d'un équipement (100) produisant de la vapeur. Grâce au recyclage sélectif de courant de purge de traitement à l'aide de vaporisateurs auxiliaires (200), on parvient à remplacer en partie le courant d'eau résiduelle avec une quantité presque équivalente de condensat de vapeur propre. Le transfert de chaleur s'effectue à l'aide dispositifs à contact indirect, tel qu'une gaine et un tube échangeur de chaleur et analogue et ce, sans que ne se mélangent les deux courants de procédé afin de permettre une récupération du condensat sans contamination croisée. Les solutions selon l'invention sont économiques et respectueuses de l'environnement. Il est possible de concevoir un appareil (42) de récupération du condensat pour faciliter le raccordement à des équipements déjà en service ainsi que pour faciliter l'enlèvement, sans interrompre le processus.

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