Importance

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Abstract

A device for the indirect heating of air or another gas at high pressure to a high temperature, consisting of a heat exchanger of a special construction submerged in a fluid bed of the 'classical type', through which flows a fluidized hot, finely powdered bed material which is introduced (2) below the bed surface (3) and discharged through an overflow (5). The heat exchanger surface is formed by hairpin-shaped tubes (6) with legs of unequal length, the shorter legs thereof discharging into the upper bottom of an inlet chamber (7) and the longer legs thereof extending down through a tubular lead-through (9) between the bottoms of said inlet chamber (7), which lead-through is concentric with said tube leg and opens into the upper bottom of an outlet chamber (8), with an annular channel between said tube (6) and said lead-through (9). A bell (12) is secured to each of the long legs above the lead-through (9), forming together with the annular channel (11) a distribution means of 'bubble cap' type for the fluidizing air supplied to the fluid bed (13). The low space (14) between the pressure chambers is separated from the fluid bed and is supplied with a small air flow, which through the annular channels (11) bubbles out below the 'bells' (12) and fluidizes the bed (13). The invention is also related to the use of said device for the indirect heating of gas, especially air.

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First Claim