Cooling optionally can be accomplished by circulating a gaseous coolant.

The flow of cooling as propels the cooling liquid through the channels.

The cooling gas may be cooled in a gas-to-gas heat exchanger fluidly coupled to the blower and configured to receive a flow of process gas to cool the cooling gas.

The blanking-off of the cooling gas duct (28) thus achieved will further prevent clinker dust from falling through the cooling gas duct.

Additionally, a gas jet (3) moving with the pin tool (1), blows cooling gas from the front against the pin tool (1) and against the cooling water escaping from the cooling ring (2).

Unreacted synthesis gas is fed through the cooling tubes of the further catalytic bed as cooling gas and cooling gas, heated to 300 to 500 °C, is fed to the first catalytic bed.

In addition, a cooling gas may be used to facilitate sub-cooling of the production fluid.

The second cooling gas may be the same as, or different from, the reducing gas.

Cooler (12) provides for cooling gas injection into the lower portion of the cooler (12), with gas flow upward and counter-current to the flow of hot DRI.

Cooling following the induction annealing is performed by impingement of cooling gases.

Moreover, the reducing gas may be purged from the reactor by a third cooling gas

During operation a cooling gas (33) flows through the cooling channels (15, 16, 17, 18).

The cooling gas system uses a compressed gas to cool a punch and/or a die pack.

The cooling apparatus has an upstream cooling chamber (14) closed downstream by a permeable partition (40) wherethrough the cooling gas flows.

The cast film is blown by cooling gas caused to flow for cooling.