Operating method for starting a once-through steam generator heated using solar thermal energy

Patent metadata

Field	Value
Publication number	US-2016208657-A1
Application number	US-201414912987-A
Country	US
Kind code	A1
Filing date	Aug 20, 2014
Priority date	Aug 28, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

An operating method for starting a once-through steam generator heated using solar thermal energy, wherein a flow medium flowing through the once-through steam generator is evaporated and superheated, using a heat carrier medium heated in a solar array, for a steam turbine connected downstream of the once-through steam generator on the flow medium side. In an operating phase under load, a first desired steady pressure value is predetermined, and in a starting phase preceding the operating phase under load, a second desired steady pressure value is predetermined, in which starting phase evaporated flow medium is diverted around the steam turbine via a steam bypass, and controlled by the predetermined second desired steady pressure value.

First claim

1 . An operating method for starting a once-through steam generator heated using solar thermal energy, comprising:
using a heat transfer medium heated in a solar array to evaporate and superheat a flow medium, flowing through the once-through steam generator, for a steam turbine connected downstream of the once-through steam generator as seen by the flow medium, wherein for a load operation phase a first fixed-pressure setpoint value is predefined, and wherein, in a start-up phase preceding the load operation phase, a second fixed-pressure setpoint value is predefined and in this start-up phase evaporated flow medium is diverted in a controlled manner via a steam bypass line around the steam turbine at the predefined second fixed-pressure setpoint value.

2 . The operating method as claimed in claim 1 , further comprising:
setting a mass flow of the flow medium diverted via the steam bypass line by means of a control valve installed in the steam bypass line, wherein the predefined second fixed-pressure setpoint value is used to control this control valve.

3 . The operating method as claimed in claim 1 ,
wherein the predefined second fixed-pressure setpoint value is in a range between 50 and 70 bar.

4 . The operating method as claimed in claim 1 ,
wherein the predefined second fixed-pressure setpoint value is greater than the first fixed-pressure setpoint value.

5 . The operating method as claimed in claim 1 ,
wherein the predefined second fixed-pressure setpoint value is approximately identical to the first fixed-pressure setpoint value.

Assignees

• Siemens Ag
• Siemens Ag

Inventors

• Brückner Jan
• Thomas Frank

Classifications

• F01K7/165

  Controlling means specially adapted therefor · CPC title

• F22B35/10

  of once-through type · CPC title

• Y02E10/46

  Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines · CPC title

• F01K13/02 Primary

  Controlling, e.g. stopping or starting · CPC title

• F03G6/06

  with solar energy concentrating means · CPC title