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.

Claims

11 · 4 independent · depth 3

11 granted claims

›1.independentA method of coal gasification and direct ironmaking, the method comprising:nrecovering heat of an exhaust gas exhausted in a coal gasification process…+1

›3.independentA method of coal gasification and direct ironmaking, the method comprising:nrecovering heat of an exhaust gas exhausted in a coal-based direct ironmak…

›4.independentA coal gasification and direct ironmaking system, comprising:na waste heat boiler suitable for recovering heat of gas exhausted from a coal gasificati…+6

›6.↳ 4multiple · 4, 5The system according to claim 4 or 5,nwherein the heat reduction furnace comprises a rotary hearth furnace that is suitable for heating and reducing a…d2+2

›9.↳ 4multiple · 4, 5The system according to claim 4 or 5,nwherein the heater comprises a superheater configured to guide steam exhausted from a steam drum of the waste he…d2

›10.↳ 4multiple · 4, 5The system according to claim 4 or 5, further comprising:na steam connection line suitable for connecting a steam drum and an inlet port of the heater…d2

›11.↳ 4multiple · 4, 5The system according to claim 4 or 5, further comprising:na gasholder suitable for reserving a product gas produced by the coal gasification furnace,w…d2

›5.independentA coal gasification and direct ironmaking system, comprising:na waste heat boiler suitable for recovering, within a coal-based direct ironmaking proce…

Classifications

11 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C10K3/06
C10J3/00
C21B11/08

USPC · US Patent Classification

75/50548/210266/17775/484266/15575/95848/99266/156

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Pendency

3.9 y

1,418 days filing → grant

Office actions

non-final + final

Responses

no RCE

Examiner

George Wyszomierski

art unit 1733 · TC 1700

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Citations: 14 back · 0 forward

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Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110197712 A1	18 Aug 2011

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