1. An injector for injecting particulate material into a metallurgical furnace, said injector having:
a first elongated tubular barrel having a front end and a rear end,
a housing defining a chamber having an inlet for particulate material, a first gas inlet and a particulate materialgas outlet connected to the rear end of the first barrel,
the first air inlet having a first nozzle operable to inject gas into the chamber at a supersonic velocity when gas at suitable pressure is passed through the nozzle, said first gas inlet being positioned so as to direct gas at supersonic velocity through the chamber to the outlet thereof so as to entrain particulate material while traveling through the chamber and then through the first barrel to cause the entrained particulate material to be discharged from the front end of the barrel, and
a second elongated tubular barrel surrounding the first barrel in spaced relationship therewith and having a front end and a rear end, the front end of the second barrel being adjacent the front end of the first barrel, the second barrel having a second gas inlet adjacent its rear end and a second nozzle adjacent its front end whereby gas under pressure supplied to the second gas inlet passes between the first and second barrels and is discharged at supersonic velocity from the front end thereof adjacent the gas and entrained particulate material discharged from the front end of the first barrel so as to shroud the particulate material.
2. An injector according to claim 1 wherein the outlet from the chamber has a conical portion tapering in the direction of flow of the particulate materialgas flow to facilitate passage of the particulate materialgas flow from the chamber to the first barrel.
3. An injector according to claim 1 wherein the gas flow between the second and first barrels also functions to cool the first barrel.
4. An injector according to claim 3 wherein the first barrel has a lining of abrasion resistant material.
5. An injector according to claim 4 wherein the lining of the first barrel is a ceramic lining.
6. An injector according to claim 1 wherein the second barrel is made of thermally conductive material.
7. An injector according to claim 6 wherein the second barrel is made of copper
8. An injector according to claim 1 wherein the chamber inlet for particulate material is positioned such that the particulate material passes into the chamber in a direction substantially perpendicular to the direction of travel of supersonic gas passing from the first inlet to the second outlet.
9. An injector according to claim 1 wherein the first nozzle is adjustable in a forwardrearward direction relative to gas flow therethrough to optimize the flow of gas into the chamber.
10. An injector according to claim 1 wherein the second nozzle is adjustable in a forwardrearward direction relative to the second barrel to optimize gas flow from the front end of the second barrel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for performing azimuthal simultaneous elastic inversion, the method comprising:
determining a reflectivity series for at least one seismic trace of seismic data obtained for a subterranean formation, wherein the reflectivity series includes anisotropy properties of said formation;
obtaining one or more synthetic seismic traces by convolving the reflectivity series with a source wavelet; and
inverting the one or more synthetic seismic traces to obtain elastic parameters estimates.
2. The method of claim 1, wherein said reflectivity series comprises Fourier coefficients characterizing azimuthal reflectivity at an angle of incidence \u03b8, wherein said reflectivity is determined at least by
R
\ue8a0
(
\u03c6
,
\u03b8
)
=
u
o
2
+
\u2211
n
=
1
N
\ue89e
(
u
n
\ue8a0
(
\u03b8
)
\ue89e
cos
\ue8a0
(
n
\ue89e
\ue89e
\u03c6
)
+
v
n
\ue8a0
(
\u03b8
)
\ue89e
sin
\ue8a0
(
n
\ue89e
\ue89e
\u03c6
)
)
.
3. The method of claim 1, wherein said inverting step comprises constructing one or more misfit weighting functions that decouple fracture parameter estimation from density, P-wave background velocity estimation, and S-wave background velocity estimation.