Patent ID: 6951106

Claim:
An integration construction between a steam boiler and a steam turbine provided with a combustion chamber, comprising: a connector structured and arranged to conduct steam from the steam boiler( 10 ) to the steam turbine ( 11 ) for rotating an electric generator (G) generating electricity, a vaporizer ( 190 ) located in the steam boiler ( 10 ), said vaporizer ( 190 ) is structured and arranged to vaporize a supply water being circulated through the steam boiler ( 10 ) and superheated in a superheater ( 120 ), an economizer ( 20 ) acting as a heat exchanger, in which heat is transferred from the flue gases of the boiler into the supply water, and the supply water is conducted into the boiler through the economizer ( 20 ), wherein the economizer ( 20 ) is provided with at least two sections, comprising at least one first economizer section ( 20 a 1 ) and at least one second economizer section ( 20 a 2 ), a supply water preheater ( 14 ) formed from the heat exchanger, wherein thermal energy is transferred from the bled steams of the steam turbine either directly or via a medium, advantageously water, into the supply water, and wherein the supply water is conducted from the first economizer section ( 20 a 1 ) to the supply water preheater ( 14 ), wherein the supply water being preheated with bled steams of the steam turbine is conducted in the steam boiler ( 10 ) to the second economizer section ( 20 a 2 ) and further, in the form of steam, to the vaporizer ( 190 ) and the superheater ( 120 ), and therethrough, to the steam turbine ( 11 ), wherein the temperature of the supply water is raised continuously as the supply water is flowing in the first economizer section ( 20 a 1 ) and from the first economizer section ( 20 a 1 ) to the supply water preheater ( 14 ) and therethrough to the second economizer section ( 20 a 2 ), wherein another connector ( 13 a 1.1 ) leading to the supply water preheater ( 14 ) comprises a valve ( 21 ) for controlling the bled-steam flow to the preheater ( 14 ), wherein the bled steam flow to the preheater ( 14 ) is controlled on a basis of the temperature measurements, that is, by measuring a temperature (T 1 ′, T 2 ′) of the flue gases made to flow in a flue-gas duct ( 10 a ) and/or a supply water temperature (T 1 ″, T 2 ″) in the connector ( 19 ).