Patent ID: 8821695

Claim:
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.