The present disclosure relates to a decompression apparatus for superheated steam comprising: a temperature raising unit having an inlet connected to an exit side of a boiler for introducing steam discharged from the exit of the boiler, and an outlet for raising the temperature of steam introduced through the inlet and discharging it; a steam utilizing unit connected to the outlet and using the steam discharged from the outlet; and a decompression unit installed at one or all of a section between the exit side of the boiler and the inlet and a section between the outlet and the steam utilizing unit, the decompression unit controlling temperature of steam while decompressing pressure of steam. According to the decompression apparatus for superheated steam, it is possible to control the pressure and temperature of steam more precisely.

A steam generator comprising water/steam tubes passing through the steam generator from the water inlet to the superheated steam outlet, horizontally arranged in tube banks, preferably flat tube banks, perpendicularly crossed by the fumes, the tubes ascend along the steam generator axis from one tube bank the other, with an oblique path so to expose the tube to the fume flow in different positions at each tube bank, the tubes are divided into two or more separate branches, each branch fed by a header distinct from the others, the steam generator being once-through in pure counter-current, vertical or horizontal, the headers of the outlet superheated steam are grouped at direct contact in a bundle, and they are thermally insulated from the outside.

The present disclosure relates to a decompression apparatus for superheated steam comprising: a temperature raising unit having an inlet connected to an exit side of a boiler for introducing steam discharged from the exit of the boiler, and an outlet for raising the temperature of steam introduced through the inlet and discharging it; a steam utilizing unit connected to the outlet and using the steam discharged from the outlet; and a decompression unit installed at one or all of a section between the exit side of the boiler and the inlet and a section between the outlet and the steam utilizing unit, the decompression unit controlling temperature of steam while decompressing pressure of steam. According to the decompression apparatus for superheated steam, it is possible to control the pressure and temperature of steam more precisely.