Method of coal gasification and direct ironmaking and system therefor
AssigneeKobe Steel, Ltd.
InventorsMasataka Tateishi, Masahiro Motoyuki
Life of this patent
Estimating the term…
Abstract
A system of coal gasification and direct ironmaking attains both heat recovery in a coal-based direct ironmaking process and a reduction in equipment investment in a coal gasification process. A waste heat boiler in the system recovers heat of gas exhausted from a coal gasification furnace. A heater in exhaust gas lines of a heat reduction furnace in the coal-based direct ironmaking process superheats the steam generated by and exhausted from the waste heat boiler. A superheated steam line supplies the steam superheated by the heater as an oxidant to the coal gasification furnace.
Claims11
A method of coal gasification and direct ironmaking, the method comprising:
- recovering heat of an exhaust gas exhausted in a coal gasification process by a waste heat boiler in the coal gasification process;
- guiding steam produced and exhausted by the waste heat boiler to a heater in an exhaust gas path in a coal-based direct ironmaking process, thereby obtaining a superheated steam;
- and
- supplying the superheated steam as an oxidant to a coal gasification furnace in the coal gasification process.
A method of coal gasification and direct ironmaking, the method comprising:
- recovering heat of an exhaust gas exhausted in a coal-based direct ironmaking process by a waste heat boiler in the coal-based direct ironmaking process;
- guiding steam produced and exhausted by the waste heat boiler to a heater in an exhaust gas path in the coal-based direct ironmaking process, thereby obtaining a superheated steam;
- and
- supplying the superheated steam as an oxidant to a coal gasification furnace in a coal gasification process.
A coal gasification and direct ironmaking system, comprising:
- a waste heat boiler suitable for recovering heat of gas exhausted from a coal gasification furnace;
- a heater in an exhaust gas path of a heat reduction furnace in a coal-based direct ironmaking process suitable for superheating steam produced and exhausted by the waste heat boiler;
- and
- a superheated steam line suitable for supplying the steam superheated by the heater as an oxidant to the coal gasification furnace.
A coal gasification and direct ironmaking system, comprising:
- a waste heat boiler suitable for recovering, within a coal-based direct ironmaking process, heat of an exhaust gas exhausted in the coal-based direct ironmaking process;
- a heater in an exhaust gas path of a heat reduction furnace in the coal-based direct ironmaking process suitable for superheating steam produced and exhausted by the waste heat boiler;
- and
- a superheated steam line suitable for supplying the steam superheated by the heater as an oxidant to a coal gasification furnace.
Dependencies are inferred from the claim text.