초록 ▼

A coupling controller opens a dump valve at the outlet of a heat recovery steam generator when such generator is to be coupled to another generator being in operation with a steam turbine on a common header. The controller gradually permits pressure build-up until the pressure at the outlet of the n

A coupling controller opens a dump valve at the outlet of a heat recovery steam generator when such generator is to be coupled to another generator being in operation with a steam turbine on a common header. The controller gradually permits pressure build-up until the pressure at the outlet of the new generator matches the pressure behind the header. The controller also responds to critical conditions in the superheater as well as in the high pressure drum of the generator in the operation.

대표청구항 ▼

Apparatus for starting a steam boiler and for coupling a steam output thereof through a throttle valve and a header to a steam feed line at an operative pressure and temperature comprising: means for draining through a bypass line steam from said steam output before said throttle valve with said thr

Apparatus for starting a steam boiler and for coupling a steam output thereof through a throttle valve and a header to a steam feed line at an operative pressure and temperature comprising: means for draining through a bypass line steam from said steam output before said throttle valve with said throttle valve being closed initially; with said draining means including a controlled drain valve and control means controlling said drain valve in a first mode for admitting a derivation flow at predetermined minimal constant flow level in said bypass line as the pressure of said steam output is increasing from substantially zero level; said controlled valve in a second mode admitting in said bypass line from said steam output a derivation flow increasing in relation to the increase of said steam output; said control means controlling said draining means in the second mode to pass a derivation flow corresponding substantially to said operative pressure at said steam output for closing said drain valve and subsequently for opening said throttle valve, whereby said header receives steam concurrently from said feed line and from said boiler at substantially the same operative pressure; with first means for sensing the operative pressure in said header; second means for sensing pressure of said output steam; said control means being responsive to a pressure intermediate between said substantially zero level pressure and said operative pressure to shift operation from said first mode to said second mode.