EP0147781B1 EP84115787A EP84115787A EP0147781B1 EP 0147781 B1 EP0147781 B1 EP 0147781B1 EP 84115787 A EP84115787 A EP 84115787A EP 84115787 A EP84115787 A EP 84115787A EP 0147781 B1 EP0147781 B1 EP 0147781B1 Authority EP European Patent Office Prior art keywords superheater waste heat heat boiler coke …