A pulse combustion dryer comprising a pulse combustion burner having a cylindrical pulse combustion chamber, to generate a pulsating combustion, a drying chamber and a tailpipe connected to the pulse combustion chamber for receiving and pressurizing pulses of hot combustion gas, and to the drying chamber for receiving pressurized pulses of hot combustion gas, a hydrogen inlet for feeding hydrogen into the pulse combustion chamber, a product feeding line for feeding a liquid or pasty product to be dried into the drying chamber to produce a spray of water steam and dried product powder, a powder separation system (10, 11) having at least one powder outlet (10b, 11b) connected to the drying chamber to separate the dried product powder and water steam coming from the drying chamber, a steam outlet line connected to the powder separation system (10, 11) to evacuate water steam, characterized in that the pulse combustion dryer further comprises an oxygen inlet for feeding oxygen into the pulse combustion chamber) and in that the steam outlet line is connected to a steam supply line (14, 14a, 14b) which is connected to at least one steam inlet of the pulse combustion burner, the steam supply line (14, 14a, 14b) for deviating at least a portion of the water steam that passes through the steam outlet line to the at least one steam inlet of the pulse combustion burner to enter the pulse combustion chamber as a cooling medium at a rate of water steam sufficient for cooling the hot combustion gas passing to the dryer chamber to a reduced gas temperature of between 300°C to 1200°C; and the oxygen inlet is arranged in a portion of the steam supply line (14, 14a, 14b) to mix oxygen and water steam that passes through the steam supply line (14, 14a, 14b) to the at least one steam inlet of the pulse combustion burner. a pulse combustion burner having a cylindrical pulse combustion chamber, to generate a pulsating combustion, a drying chamber and a tailpipe connected to the pulse combustion chamber for receiving and pressurizing pulses of hot combustion gas, and to the drying chamber for receiving pressurized pulses of hot combustion gas, a hydrogen inlet for feeding hydrogen into the pulse combustion chamber, a product feeding line for feeding a liquid or pasty product to be dried into the drying chamber to produce a spray of water steam and dried product powder, a powder separation system (10, 11) having at least one powder outlet (10b, 11b) connected to the drying chamber to separate the dried product powder and water steam coming from the drying chamber, a steam outlet line connected to the powder separation system (10, 11) to evacuate water steam, characterized in that the pulse combustion dryer further comprises an oxygen inlet for feeding oxygen into the pulse combustion chamber) and in that the steam outlet line is connected to a steam supply line (14, 14a, 14b) which is connected to at least one steam inlet of the pulse combustion burner, the steam supply line (14, 14a, 14b) for deviating at least a portion of the water steam that passes through the steam outlet line to the at least one steam inlet of the pulse combustion burner to enter the pulse combustion chamber as a cooling medium at a rate of water steam sufficient for cooling the hot combustion gas passing to the dryer chamber to a reduced gas temperature of between 300°C to 1200°C; and the oxygen inlet is arranged in a portion of the steam supply line (14, 14a, 14b) to mix oxygen and water steam that passes through the steam supply line (14, 14a, 14b) to the at least one steam inlet of the pulse combustion burner.