Atomizer and combustion device using the same
An atomizer includes a mixing chamber for mixing spray fuel and spray medium, a spray fluid flow passage for supplying the spray fluid into the mixing chamber, a spray medium flow passage for supplying the spray medium into the mixing chamber, and an outlet hole for spraying a mixed fluid of the spray fluid and the spray medium which have been mixed in the mixing chamber to the outside. The spray medium flow passage includes a first spray medium supply hole for supplying the spray medium into the mixing chamber, and a second spray medium supply hole for supplying the spray medium into a region more downstream than the first spray medium supply hole in the mixing chamber, and the second spray medium supply hole supplies the spray medium to a region around the outlet hole.
1. An atomizer comprising:
a mixing chamber for mixing spray fluid and spray medium;
a spray fluid flow passage for supplying the spray fluid into the mixing chamber;
a spray medium flow passage for supplying the spray medium into the mixing chamber; and
outlet holes formed at a downstream end surface of the mixing chamber for spraying a mixed fluid of the spray fluid and the spray medium which have been mixed in the mixing chamber outside of the mixing chamber, wherein:
the spray medium flow passage includes a first spray medium supply holes for supplying the spray medium into the mixing chamber, and a second spray medium supply holes for supplying the spray medium into a region located more downstream than the first spray medium supply holes in the mixing chamber;
the second spray medium supply holes are formed by a side surface of the mixing chamber and the downstream end surface of the mixing chamber;
the second spray medium supply holes serve to supply the spray medium to a region around the outlet holes adjacent to an inner circumference of the outlet holes.
2. The atomizer according to claim 1 , wherein:
the spray fluid flow passage includes at least two channels through which the spray fluid flows in opposite directions at an upstream side of the spray fluid flow passage; and
a joint portion of the channels through which the spray fluid flows in opposite directions is formed at a downstream side of the spray fluid flow passage.
3. The atomizer according to claim 1 , wherein the spray fluid flow passage includes at least two spray fluid supply holes for supplying the spray fluid from the spray fluid flow passage into the mixing chamber.
4. The atomizer according to claim 1 , wherein the spray medium flow passage includes at least two spray medium supply holes for supplying the spray medium from the spray medium flow passage into the mixing chamber.
5. The atomizer according to claim 2 , wherein a rectangular groove is formed orthogonal to the channels through which the spray fluids flow in opposite directions so that a spray fluid supply hole for supplying the spray fluid into the mixing chamber is formed at an intersection between the groove and the channels.
6. The atomizer according to claim 5 , wherein a channel cross-section area of the spray medium supply holes is widened in a longitudinal direction of the groove constituting the spray fluid supply hole.
7. The atomizer according to claim 1 , wherein the first spray medium supply holes are annularly arranged.
8. A combustion device comprising an atomizer with a mixing chamber for mixing spray fluid and spray medium, a spray fluid flow passage for supplying the spray fluid into the mixing chamber, a spray medium flow passage for supplying the spray medium into the mixing chamber, and outlet holes formed at a downstream end surface of the mixing chamber for spraying a mixed fluid of the spray fluid and the spray medium which have been mixed in the mixing chamber outside of the mixing chamber, wherein:
the spray medium flow passage includes a first spray medium supply holes for supplying the spray medium into the mixing chamber, and a second spray medium supply holes for supplying the spray medium into a region located more downstream than the first spray medium supply holes in the mixing chamber;
the second spray medium supply holes are formed by a side surface of the mixing chamber and the downstream end surface of the mixing chamber; and
the second spray medium supply holes serve to supply the spray medium to a region around the outlet holes adjacent to an inner circumference of the outlet holes.
9. The combustion device according to claim 8 , wherein a liquid fuel is supplied as the spray fluid into the mixing chamber, and air or vapor is supplied as the spray medium into the mixing chamber.
10. The combustion device according to claim 8 , further comprising:
a gas turbine combustor serving as the combustion device, which uses a liquid fuel;
a fuel supply system which supplies the liquid fuel to the gas turbine combustor;
a combustion air supply system for supplying combustion air to the gas turbine combustor;
a gas turbine driven by combustion exhaust gas generated by the gas turbine combustor; and
a compressor for supplying the combustion air to the gas turbine combustor, wherein the liquid fuel is supplied as the spray fluid into the mixing chamber, and the combustion air is partially compressed as the spray medium so as to be supplied into the mixing chamber.