STEAM BLOWING PART -III
Stage 3a -- Steam inlet line from COLD RE HEAT to TURBINE DRIVEN BOILER FEED PUMP A ESV. Steam
valve of PRDS line will be kept closed. Electro hydraulic control valve will
not be erected and steam blowing arrangement (Blanking device) shall be used.
This stage shall be concluded by observing the indents on target plates.
Stage 3b -- Steam inlet line from CRH to TDBFP B ESV. Steam
valve of PRDS line will be kept closed. Electro hydraulic control valve will
not be erected and steam blowing arrangement (Blanking device) shall be used.
This stage shall be concluded by observing the indents on target plates.
Operation during Stage 3a & 3b
Boiler is lighted up and Separator pressure raised to 20
Kg/cm2 and steam lines charged from Boiler outlet up to dummies provided in the
temporary piping of stages 2a and 2b. (Alternatively, after restoration of ESV,
IV, HPBP, LPBP, 3a & 3b stages blowing can be taken up at a later date
prior to commg of TDBFP turbine)
Temporary
steam valve or Dummy provided in the Temporary exhaust lines connected to
permanent steam lines to TDBFPs is kept open.
CRH-1 & CRH-3 are gradually opened to full. Steam blowing
is carried out for 20-30 minutes at about 50% of system operating pressure.
Blowing is continued with a gap of two hours between the blows.
After few blows, Target Plates are put and further blowing
continued. Termination of stage 3a and 3b are as per Target plate results as
given in Section 9.0.
Stage 4 -- Auxiliary Steam Lines
4a – From PRDS to TDBFP A ESV
4b --From PRDS to TDBFP B ESV
4c -- From CRH to Turbine extraction lines
4d -- From CRH to extraction line to Deaerator
4e -- From CRH to Deaerator / FST
4f -- From CRH to HP Heaters
4g -- From CRH to Turbine gland sealing header
4h -- From CRH to PRDS to Aux Steam Header
4i -- From Main Steam line to PRDS to Aux Steam Header
Steam blowing of sub-stages 4h & 4i shall be done prior
to blowing of sub-stages 4a & 4b.
Operation
Stage 4
Temporary
steam valve or Dummy provided in the Temporary exhaust line connected to
permanent steam line to BFP Turbine is kept open.
Steam
blowing for sub-stages 4a & 4b is carried out for 20-30 minutes. Blowing is
continued with a gap of two hours between the blows.
After
few blows, Target Plates are put and further blowing continued. Termination of
stage 4a and 4b are as per Target plate results as given in Section 9.0.
Minimum
three nos. of blows are given for each of sub stag 4c to 4i. Blows are given at
intervals of one hour.
continued to part-iv
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ReplyDeletenew boiler cost
Hey your blog is so informative. Got some ideas on blowing and stages of operating about Steam turbine. Very thankful!
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