Cracking catalysts, additives, methods of making them and using them
Collection enhanced materials, flue gas additives, and methods of making the enhanced materials and flue gas additives are provided. In one embodiment, a down stream addition system configured to control material passing through a metering device from a vessel to a gaseous exhaust path extending between a unit and an exhaust flue of the unit is provided. In alternative embodiments, methods are provided for introducing at least one of a flue gas additive and a collection enhanced material to a gaseous exhaust stream exiting a unit; exposing and removing at least a portion of at least one a of flue gas additive and a collection enhanced material from a gaseous exhaust stream exiting a unit prior to entering an exhaust flue; and recycling at least a portion of material removed a from a gaseous exhaust stream exiting a unit back to the gaseous exhaust stream without passing through the unit.
1. A flue gas addition system comprising:
an exhaust gas conduit, which extends between an outlet of a fluidized catalyst cracking (FCC) unit and an exhaust flue of the FCC unit;
a first vessel having at least a first outlet, for providing a downstream additive into the exhaust gas conduit;
a metering device coupled to the first outlet and configured to control material passing through the metering device from the first vessel to the exhaust gas conduit; and
a sensor configured to provide a metric indicative of material passing through the metering device.
2. The flue gas addition system of claim 1 further comprising:
a controller operable to control the metering device such that the metering device provides continuous and/or intermittent addition of material from the first vessel to the exhaust gas conduit.
3. The flue gas addition system of claim 1 , wherein the metering device further comprises:
an eductor or a positive displacement device.
4. The flue gas addition system of claim 1 further comprising:
a feed vessel system coupled to an inlet of the first vessel, the feed vessel system comprising:
a feed vessel having an outlet coupled to the inlet of the first vessel;
a feed vessel metering device coupled to an outlet of the feed vessel and configured to control material passing through the feed vessel metering device to the inlet of the first vessel; and
a feed vessel sensor configured to provide a metric indicative of material passing through the feed vessel metering device.
5. The flue gas addition system of claim 1 , wherein the first vessel comprises:
a plurality of compartments, each compartment having an outlet coupled to a respective metering device.
6. The flue gas addition system of claim 1 further comprising:
a transportable platform on which the first vessel is mounted.
7. The flue gas addition system of claim 1 further comprising:
at least one particle removal device positioned to remove particles from the exhaust gas conduit.
8. The flue gas addition system of claim 7 further comprising:
a recycling line coupled between the at least one particle removal device and the FCC unit.
9. The flue gas addition system of claim 7 , wherein the at least one particle removal device is selected from the group consisting of a magnetic separator, a third stage separator, a cyclone separator, and an electrostatic precipitator.