PROCESS FOR CAPTURING A HEAVY METAL CONTAINED IN A MOIST GAS, INTEGRATING A HEAT PUMP TO HEAT THE GAS INTRODUCED INTO A CAPTURE MASS

摘要

Capturing at least one heavy metal, from mercury and arsenic, contained in a moist gas comprising water vapour, by the following steps:
a) heating the moist gas by heat exchange with a compressed heat transfer fluid obtained in step e) in order to obtain a condensed heat transfer fluid and a gas reheated to a temperature Tc;b) bringing the reheated gas into contact with a heavy metal capture mass in order to obtain a gas depleted in heavy metal;c) decompressing the cooled heat transfer fluid;d) cooling the gas depleted in heavy metal by heat exchange with the heat transfer fluid produced in step c) in order to obtain a cooled gas at a temperature Tf, the heat transfer fluid being vaporized;e) compressing the vaporized heat transfer fluid in a manner such as to obtain a compressed heat transfer fluid, the compressed heat transfer fluid being recycled.

主权项

1. A process for capturing at least one heavy metal, selected from mercury and arsenic, contained in a moist gas comprising water vapour, in which the following steps are carried out:
a) heating (1001) the moist gas by heat exchange with a compressed heat transfer fluid obtained in step e) in order to obtain a condensed heat transfer fluid and a gas reheated to a temperature Tc; b) bringing the reheated gas obtained in step a) into contact with a heavy metal capture mass (2000) in order to obtain a gas which is depleted in heavy metal; c) decompressing (4000) the cooled heat transfer fluid obtained in step a); d) cooling (1003) the gas depleted in heavy metal by heat exchange with the heat transfer fluid produced in step c) in order to obtain a cooled gas at a temperature Tf, the heat transfer fluid being vaporized during step d); e) compressing (3000) the vaporized heat transfer fluid obtained in step d) in a manner such as to obtain a compressed heat transfer fluid, the compressed heat transfer fluid being recycled to step a).