POWER October 2020 - 41

PLANT COMMISSIONING
mon circuit for both HP and HRH.
■ Using digital microscopic pictures of
each target plate to check Siemens'
acceptance criteria for stage completion
(Figure 2).
Risk Mitigation. Certain risks that
were anticipated under remote operating
conditions were mitigated in consultation
with Siemens Energy experts.
Examples include:
2. This image shows a magnified view of target
plates after the steam blow, which allows
digital microscopic measurements of indentations.
Courtesy: L&T
■ Implementing online DF (disturbance
factor/cleaning ratio) monitoring in the
plant distributed control system (DCS),
in accordance with the DF formula,
which required pressure, temperature,
and flow conditions during blowout and
at maximum rated capacity.
■ Optimizing the total number of circuits/stages,
resulting in five to clean,
which were the high-pressure (HP),
low-pressure (LP), intermediate-pressure
(IP), hot reheat (HRH), and cold
reheat (CRH) circuits, with one com■
Misinterpretations of controls during
remote communication.
■ Analysis and monitoring vigilantly during
fault occurrence.
■ Internet
connectivity and internet
speed/gateway issues.
■ Daily readiness before plant startup
for close coordination for open cycle
and combined cycle mode of GT operation.
Achievement.
On May 17, 2020,
the GT was synchronized with the grid.
Hot gas was admitted to the HRSG and
steam blowing started the next day.
Steam blowing was undertaken in the
following four stages:
■
■
Stage 1. A 4-hour service blow was conducted
on May 18 through the HP-HP
blow path upstream and downstream
circuit, and the IP-LP circuit.
■
Stage 2. An 8-hour service blow was
conducted between May 19 and May
20 through the HP-HP blow path upstream
and downstream-CRH circuit,
and the IP-LP blow path upstream
and downstream circuit.
■
Stage 3. A 24-hour and 5-minute target
blow was conducted between June 2
and June 9 through the HP-CRH + IPHRH
circuits.
Stage 4. A 9-hour and 15-minute service
blow was conducted between
June 10 and June 11 through the HPCRH
+ IP-HRH-IP blow path circuit.
On June 6, 2020, for Stage 3 target
blow acceptance, digital microscopic
pictures of the target plates were sent
to Siemens Energy's design and process
team for approval. Acceptance
was received on June 9, 2020. ■
-Arvind Kumar Singh is project
director for the Bibiyana South
400-MW combined cycle
power project.
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POWER October 2020

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