System and process for removal of pollutants from a gas stream

A process for dry removal of SOX and NOX from a gas stream in a single reaction zone, comprising the steps of:

• a. providing a continuous process system having a single reaction zone for dry removal of SOX at a removal rate of at least 99% and of NOX at a removal rate of at least 96% from a gas stream in the reaction zone, the process comprising the steps of:
• i. configuring a dry sorbent-reactant feeder for controlled feed of a supply of dry sorbent-reactant of regenerable oxides of manganese and/or regenerated oxides of manganese, wherein the feeder is configured to handle and feed the dry sorbent-reactant in particle form;
• ii. connecting the reaction zone to the sorbent-reactant feeder and to a source of a gas containing SOX and NOX, the reaction zone having a first portion and a second portion, the first portion being configured for introduction of the dry sorbent-reactant and the gas and the second portion being configured to receive the gas and the dry sorbent-reactant from the first portion;
• the reaction zone being configured to substantially strip the gas of SOX at a targeted SOX capture rate set point of at least 99% through formation of sulfates of manganese, to substantially strip the gas of NOX at a targeted NOX capture rate set point of at least 96% through formation of nitrates of manganese, and to render the gas free of the sorbent-reactant prior to the gas being vented from the reaction zone;
• b. selecting and introducing the dry sorbent-reactant into the feeder, the dry sorbent-reactant being oxides of manganese selected so that upon regeneration the sorbent-reactant is in particle form and has the chemical formula MnOX, where X is about 1.5 to 2.0, the oxides of manganese having a particle size ranging from about 6 microns to about 500 microns and a BET value ranging from about 1 to about 1000 m2/g;
• c. operating the system so that the dry sorbent-reactant and gas are introduced into the first portion of the reaction zone, the gas being at temperatures ranging from ambient temperature to about 350° F., and so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at a targeted SOX capture rate set point of at least 99% and to effect NOX capture at a targeted NOX capture rate set point of at least 96%;
• d. routing the gas and the dry sorbent-reactant into the first portion of the reaction zone and then into the second portion of the reaction zone so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at the targeted SOX capture rate set point of at least 99% and to effect NOX at the targeted NOX capture rate set point of at least 96%, the SOX being captured through formation of sulfates of manganese and the NOX being captured through the formation of nitrates of manganese;
• e. rendering the gas in the reaction zone free of the dry sorbent-reactant;
• and
• f. venting the gas from the reaction zone.

A process for dry removal of SOX and NOX from a gas stream in a single reaction zone, comprising the steps of:

• a. providing a continuous process system having a single reaction zone for dry removal of SOX at a removal rate of at least 98% and of NOX at a removal rate of at least 90% from a gas stream in the reaction zone, the process comprising the steps of:
• i. configuring a dry sorbent-reactant feeder for controlled feed of a supply of dry sorbent-reactant of regenerable oxides of manganese and/or regenerated oxides of manganese, wherein the feeder is configured to handle and feed the dry sorbent-reactant in particle form;
• ii. connecting the reaction zone to the sorbent-reactant feeder and to a source of a gas containing SOX and NOX, the reaction zone having a first portion and a second portion, the first portion being configured for introduction of the dry sorbent-reactant and the gas and the second portion being configured to receive the gas and the dry sorbent-reactant from the first portion;
• the reaction zone being configured to substantially strip the gas of SOX at a targeted SOX capture rate set point of at least 99% through formation of sulfates of manganese, to substantially strip the gas of NOX at a targeted NOX capture rate set point of at least 96% through formation of nitrates of manganese, and to render the gas free of the sorbent-reactant prior to the gas being vented from the reaction zone;
• b. selecting and introducing the dry sorbent-reactant into the feeder, the dry sorbent-reactant being oxides of manganese selected so that upon regeneration the sorbent-reactant is in particle form and has the chemical formula MnOX, where X is about 1.5 to 2.0, the oxides of manganese having a particle size ranging from about 6 microns to about 500 microns and a BET value ranging from about 1 to about 1000 m2/g;
• c. operating the system so that the dry sorbent-reactant and gas are introduced into the first portion of the reaction zone, the gas being at temperatures ranging from ambient temperature to about 350° F., and so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at a targeted SOX capture rate set point of at least 98% and to effect NOX capture at a targeted NOX capture rate set point of at least 90%;
• d. routing the gas and the dry sorbent-reactant into the first portion of the reaction zone and then into the second portion of the reaction zone so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at the targeted SOX capture rate set point of at least 98% and to effect NOX at the targeted NOX capture rate set point of at least 90%, the SOX being captured through formation of sulfates of manganese and the NOX being captured through the formation of nitrates of manganese;
• e. rendering the gas in the reaction zone free of the dry sorbent-reactant;
• and
• f. venting the gas from the reaction zone.

A process for dry removal of SOX and NOX from a gas stream in a single reaction zone, comprising the steps of:

• a. providing a continuous process system having a single reaction zone for dry removal of SOX at a removal rate of at least 60% and of NOX at a removal rate of at least 60% from a gas stream in the reaction zone, the process comprising the steps of:
• i. configuring a dry sorbent-reactant feeder for controlled feed of a supply of dry sorbent-reactant of regenerable oxides of manganese and/or regenerated oxides of manganese, wherein the feeder is configured to handle and feed the dry sorbent-reactant in particle form;
• ii. connecting the reaction zone to the sorbent-reactant feeder and to a source of a gas containing SOX and NOX, the reaction zone having a first portion and a second portion, the first portion being configured for introduction of the dry sorbent-reactant and the gas and the second portion being configured to receive the gas and the dry sorbent-reactant from the first portion;
• the reaction zone being configured to substantially strip the gas of SOX at a targeted SOX capture rate set point of at least 60% through formation of sulfates of manganese, to substantially strip the gas of NOX at a targeted NOX capture rate set point of at least 60% through formation of nitrates of manganese, and to render the gas free of the sorbent-reactant prior to the gas being vented from the reaction zone;
• b. selecting and introducing the dry sorbent-reactant into the feeder, the dry sorbent-reactant being oxides of manganese selected so that upon regeneration the sorbent-reactant is in particle form and has the chemical formula MnOX, where X is about 1.5 to 2.0, the oxides of manganese having a particle size ranging from about 6 microns to about 500 microns and a BET value ranging from about 1 to about 1000 m2/g;
• c. operating the system so that the dry sorbent-reactant and gas are introduced into the first portion of the reaction zone, the gas being at temperatures ranging from ambient temperature to about 350° F., and so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at a targeted SOX capture rate set point of at least 60% and to effect NOX capture at a targeted NOX capture rate set point of at least 60%;
• d. routing the gas and the dry sorbent-reactant into the first portion of the reaction zone and then into the second portion of the reaction zone so that the gas and the dry sorbent-reactant are in contact for a time sufficient to effect SOX capture at the targeted SOX capture rate set point of at least 60% and to effect NOX at the targeted NOX capture rate set point of at least 60%, the SOX being captured through formation of sulfates of manganese and the NOX being captured through the formation of nitrates of manganese;
• e. rendering the gas in the reaction zone free of the dry sorbent-reactant;
• and
• f. venting the gas from the reaction zone.