Steam generation apparatus and exhaust gas heat recovery plant

A steam generation apparatus comprising:

• a heat medium flow passage through which a heat medium flows;
• an economizer disposed in the heat medium flow passage;
• a primary evaporator disposed in the heat medium flow passage at an upstream side of the economizer with respect to a flow direction of the heat medium;
• a first flash tank for generating flash steam;
• a first feed water line configured to supply water heated by the economizer to the primary evaporator;
• a second feed water line disposed so as to branch from the first feed water line and configured to supply the water heated by the economizer to the first flash tank;
• and
• a superheater disposed in the second feed water line and configured to superheat steam generated by the first flash tank with water flowing through the second feed water line,
• wherein the steam generated by flashing water heated by the economizer is superheated by not-yet flashed water heated by the economizer.

A steam generation apparatus comprising:

• a heat medium flow passage through which a heat medium flows;
• a primary economizer disposed in the heat medium flow passage;
• a secondary economizer disposed in the heat medium flow passage at an upstream side of the primary economizer with respect to a flow direction of the heat medium;
• a primary evaporator disposed in the heat medium flow passage at an upstream side of the secondary economizer with respect to the flow direction of the heat medium;
• a first feed water line configured to supply water heated by the primary economizer to the secondary economizer;
• and
• a sixth feed water line configured to supply water heated by the secondary economizer to the primary evaporator without letting the water exchange heat with the heat medium,
• wherein feed water flowing to the secondary economizer has a smaller mass flow rate than feed water flowing to the primary economizer,
• wherein the steam generation apparatus comprises a plurality of economizers including the primary economizer and the secondary economizer at a downstream side of the primary evaporator with respect to the flow direction of the heat medium in the heat medium flow passage, and
• includes a feed water acquisition line for acquiring a part of water flowing out from an outlet of one of the plurality of economizers.