Two-stage gasifier and gasification process with feedstock flexibility
A gasification process may include (a) introducing a liquid hydrocarbon feedstock and at least one of a dry feedstock or a first slurried feedstock into a reactor lower section, wherein the at least one dry feedstock or first slurried feedstock is introduced through two primary feed nozzles while the liquid hydrocarbon feedstock is introduced through at least two secondary feed nozzles; (b) partially combusting the feedstocks in the reactor lower section with a gas stream comprising an oxygen-containing gas or steam to evolve heat and form products comprising hot synthesis gas; (c) passing said hot synthesis gas from step (b) upward into a reactor upper section; (d) and introducing a second slurried feedstock into said reactor upper section, whereby heat from said hot synthesis gas supports reaction of the second slurried feedstock by pyrolysis and gasification reactions.
1. A method for improving a two-stage gasification reactor, wherein the two-stage gasification reactor comprises a reactor lower section and a reactor upper section, the reactor lower section having a lower reactor body and two primary feed nozzles, configured to introduce at least one of a dry feedstock or a first slurried feedstock from a feeding system, located on opposing terminal ends of the lower reactor body, the reactor upper section having a upper reactor body and at least one upper feed nozzle, configured to introduce at least one of a dry feedstock or a first slurried feedstock, located on the upper reactor body, the method comprising:
installing at least two secondary feed nozzles on the lower reactor body for introducing a liquid hydrocarbon feedstock from a liquid hydrocarbon feedstock supply system of the reactor lower section into the lower reactor body to supplement a primary feedstock comprised of the dry feedstock or the first slurried feedstock that is introduced through the two primary feed nozzles;
orienting the at least two secondary feed nozzles to provide feeds along secondary feed vectors that maintain a vertical symmetry within the reactor lower section with feeds along primary feed vectors from the two primary feed nozzles; and
forming an angle from about +/−1-45 degrees for at least one secondary feed vector of the at least two secondary feed nozzles with respect to a primary feed vector of the two primary feed nozzles, and at least one of the at least two secondary feed nozzles is not co-planar in a z-axis with the two primary feed nozzles.
2. The method of claim 1 , further comprising orienting the at least two secondary feed nozzles and the two primary feed nozzles to provide feeds along feed vectors that intersect at a feed intersection point that is substantially in the center of the lower reactor body.
3. The method of claim 1 , further comprising locating the at least two secondary feed nozzles on opposing terminal ends of the lower reactor body so that each terminal end possesses the same number of secondary feed nozzles.
4. The method of claim 1 , further comprising orienting each secondary feed vector of each secondary feed nozzle on one terminal end to form a straight line with a secondary feed vector from a secondary feed nozzle on the opposing terminal end.
5. The method of claim 1 , further comprising atomizing the liquid hydrocarbon feedstock with the at least two secondary feed nozzles using nitrogen, recycled synthesis gas, air, oxygen enriched air, oxygen, steam, or mixtures thereof.