Page 19 - Cover options

JSW ENERGY BOLT | ISSUE 2

Auxiliary Power Reduction During Part Load

Operation Of 300 MW Unit

How and Why was the problem In CHP, Bunker ventilation system (BVS) is
identified? crucial in de-dusting activity. As BVS is

required to be operated along with
SBU-2 300 MW units are operated at part
conveyors during coal feeding, at times it
load due to low schedule. As units
used to be run continuously without coal
operating at part load will have impact on
on conveyor, which is not required. This
cost of generation due to high Auxiliary
loss was eliminated by fixing an alarm in
power consumption (APC) and Heat rate.
PLC to alert operator to stop BVS when
Since one of the unit being operated at 150
coal is not fed.
MW most of the time during a day,
Operating common CW pump during part
APC was accounting to 8.25%. Continuous
load not only resulted in savings on
monitoring, analysis and brainstorming
running unit, but at the same time, flow
sessions helped in identifying potential for
can be established to reserve shutdown
energy savings and reduction in APC.
unit for circulation, thus running of
Major Contributors for high APC identified
additional pump in shutdown unit is
were CW pump, CEP, CCW and CHP.
eliminated.

How was the problem solved?
What were the challenges encountered?

After identifying equipment / systems
Ensuring equipment reliability and
which have potential for improvement,
response during part load operation with
following actions were initiated. Decision
variable load is a challenge after
was taken to operate one CCW pump at
implementing changes in operational
load < 160 MW as the flow and pressure
philosophy.
was adequate for this load.

Even though VFD in CEP was installed way
back in 2014, scope for further reduction in

power consumption was observed.
A curve was incorporated in DCS logic for

Auto changing of header pr. Set point w.r.t.
load which not only eliminated risk of

human error, but considerable savings in
power consumption was achieved

in CEP.

15