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US 8,821,695 B2Granted
Coal reforming system
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsFumiaki Sato, Setsuo Omoto, Makoto Susaki
Life of this patent
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Abstract
A coal reforming system includes a drying furnace for drying low-grade coal, a carbonizing furnace for carbonizing the dried low-grade coal, hot air generating furnaces for supplying hot air to the drying furnace or the carbonizing furnace, and a carbonizing gas circulation line for supplying a carbonizing gas, which is generated in the carbonizing furnace, as a fuel for the hot air generating furnaces while the temperature thereof is maintained.
Claims4
A coal reforming system comprising:
- a drying device for drying low-grade coal by bringing hot air into direct contact with the low-grade coal;
- a carbonizing device for carbonizing the dried low-grade coal by bringing hot air into direct contact with the dried low-grade coal, gas exhausted from the carbonizing device containing a carbonizing gas generated therein;
- a hot air supplying device for supplying the hot air to the drying device or the carbonizing device, the carbonizing gas being reused as a fuel for the hot air supplying device;
- and
- a carbonizing gas circulation line for supplying the exhaust gas from the carbonizing device to the hot air supplying device, which is generated in the carbonizing device, as a fuel for the hot air supplying device while the temperature thereof is maintained without cooling the exhaust carbonizing gas;
- and
- a first waste gas circulation line for mixing the hot air to be supplied to the carbonizing device with a part of waste gas from the drying device to decrease a temperature of the hot air.
4 more elements
Dependencies are inferred from the claim text.