Process to recover energy form hot gas

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 45/12 (2006.01) C21C 5/38 (2006.01) F23J 15/02 (2006.01) F23J 15/06 (2006.01)

Patent

CA 2456557

Process to recover energy from a gas having a temperature of above 650 ~C and an absolute pressure of more than 1.7 bar and comprising non-solidified alkali containing compounds and particles by performing the following steps: (a)cooling the gas to a temperature of below 550 ~C by means of a shell-tube heat exchanger (6), wherein the hot gas is passed at the shell side and coolant water is passed at the tube side, wherein steam is formed, from which steam energy is recovered, (b) separating the particles from the gas by means of one or more sequentially arranged centrifugal separation devices (7, 8) to a dust level of below 400 mg/Nm3, (c) expanding the gas in an expander (13) to recover energy.

La présente invention concerne un processus de récupération d'énergie à partir de gaz chaud possédant une température supérieure à 650·C et une pression absolue supérieure à 1,7 bar et comprenant des composés et des particules contenant des alcalis non solidifiés. Ce processus comprend les étapes suivantes: (a) refroidissement du gaz à une température inférieure à 550·C au moyen d'un échangeur (6) thermique à calandre, le gaz chaud étant passé du côté calandre et l'eau de refroidissement étant passée du côté tube, de la vapeur se forme et on récupère de l'énergie de la vapeur, (b) séparation des particules contenues dans le gaz au moyen d'un ou de plusieurs dispositifs (7, 8) de séparation centrifuge agencés séquentiellement à l'état de poussière ou en dessous de 400 mg/Nm3, et (c) dilatation du gaz dans un dilatateur (13) de façon à récupérer l'énergie.

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