Steam heat exchanger

A steam heat exchanger, characterized by comprising a composite header (1) with a liquid discharge pipe (10), wherein a first-stage steam inlet header (4) and a second-stage steam inlet header (6) are arranged above the composite header (1), the first-stage steam inlet header (4) is provided with a steam inlet pipeline (3), and the composite header (1) and the second-stage steam inlet header (6) are in communication with each other by means of a transition pipe (7);

• and further comprising two groups of heat exchange tubes or heat exchange plates, wherein inlet and outlet ends of a first group of heat exchange tubes or heat exchange plates are respectively connected to the first-stage steam inlet header (4) and the composite header (1), and inlet ends of a second group of heat exchange tubes or heat exchange plates are connected to the second-stage steam inlet header (6) and outlet ends of the second group of heat exchange tubes or heat exchange plates are directly connected to the composite header (1);
• wherein the liquid discharge pipe (10) is connected to a liquid reservoir (9), and a balance pipe (8) is connected between the second-stage steam inlet header (6) and the liquid reservoir (9).