Importance

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Abstract

The present invention concerns an integration construction between a steam boiler provided with a combustion chamber and a steam turbine. The steam is conducted from the steam boiler (10) along a connector to the steam turbine (11) for rotating an electric generator (G) producing electricity. The supply water circulated via the steam boiler (10) is vaporized in vaporizer (190) located in the steam boiler (10) and superheated in a superheater (120). The supply water is conducted into the boiler through an economizer (20) acting as a heat exchanger, in which heat is transferred from the flue gases of the boiler into the supply water. The economizer (20) is provided with at least two sections, comprising at least one first economizer section (20a.sub.1) and at least one second economizer section (20a.sub.2). The supply water preheated with bled steams of the steam turbine is conducted in the steam boiler (10) further from the economizer (20) to the vaporizer and the superheater and therethrough, in the form of steam, to the steam turbine. A connector (19) leading to the economizer sections (20a.sub.1, 20a.sub.2) comprises a branch point (D.sub.1) to a by-pass connector (21) of supply water, whereby the economizer section (20a.sub.1) can be bypassed by at least part of the supply water flow. The invention also concerns a method in preheating of the supply water for the steam turbine and in its control.

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First Claim