| 摘要 |
PROBLEM TO BE SOLVED: To make a duct preventive against choking, highly efficient in recovery of heat, and economize on the heat-transfer area of a heating tube. SOLUTION: In this crude gas cooler 7 crude gas obtained by gasification of fuel such as coal is put in contact with a vaporizer 3 and an economizer 4 and the heat of gasification is recovered by transfer of heat. In this instance the cooler body 2 is demarcated into an upward flow side water-cooled wall part 5a through which the crude gas is passed upward and a downward flow side water-cooled wall part 5b through which the crude gas is passed downward and discharged. The upward flow side water-cooled wall part 5a is provided with a vaporizer 3 and the downward flow side water-cooled wall part 5b, with an economizer 4. |
