Toxic gas condensation and retreatment system

An exhaust system for eliminating toxic gases from a gaseous exhaust stream comprising:

• an exhaust line in fluid connection with a first direct contact heat exchanger and a second direct contact heat exchanger downstream of the first direct contact heat exchanger, each direct contact heat exchanger having a mixing chamber containing a plurality of nozzles spraying cold moist air vapor and at least two horizontal strips positioned at different vertical levels inside the chamber;
• and
• a catalytic converter connected to the first direct contact heat exchanger and the second direct contact heat exchanger;
• wherein the first direct contact heat exchanger includes
• a connection line located at a top of the mixing chamber to transfer toxic gases to the catalytic converter, and
• a first post-treatment tank that is in fluid connection with at least the second direct contact heat exchanger containing a holding reservoir and at least one injection device, and
• wherein the second direct contact heater exchanger includes
• a recirculation line in fluid connection with a second inlet of the second direct contact heater exchanger at a location above the horizontal strips, and
• a first inlet disposed directly opposite and below the second inlet and connected to an output of the catalytic convert,
• wherein the nozzles are configured to spray cold moist air vapor in a sufficient amount to at least partially condense and dissolve the toxic gases;
• wherein the connection line is configured to transport remaining toxic gases from the first direct contact heat exchanger to the second direct contact heat exchanger
• wherein the recirculation line is configured to recirculate remaining toxic gases into the second direct contact heat exchanger to condense or dissolve in the cold moist air vapor;
• and
• wherein the first post-treatment tank is configured to agglomerate condensed and dissolved toxic gases.

A gas- and liquid-phase direct contact heat exchanger comprising:

• a housing of a generally cuboidal shape;
• a mixing chamber;
• a second inlet on a second side surface directly opposite the first side surface having an extended portion inside the mixing chamber, the second inlet receiving cooled air external to the exhaust system;
• a plurality of nozzles on the extended portion of the second inlet;
• a plurality of horizontal strips positioned at different vertical levels below the plurality of nozzles;
• a first inlet connected above the horizontal strips and configured to receive an gaseous exhaust stream via an exhaust line and transfer the gaseous exhaust stream to the mixing chamber;
• a first outlet;
• a recirculation line connected with the second inlet at an upper portion of the mixing chamber above the second inlet;
• and
• a second outlet;
• wherein the first inlet is configured to inject hot gases into the mixing chamber;
• wherein the second inlet is configured to inject cold moist air;
• wherein the nozzles are configured to spray cold moist air vapor in a sufficient amount to at least partially condense and dissolve the hot gases;
• wherein the recirculation line is configured to recirculate remaining hot gases vented by the second outlet into the mixing chamber via the second inlet to condense and dissolve in the cold moist air vapor;
• and
• wherein the second outlet is configured to release condensed and dissolved gases.