Electricity + Control April 2016

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ROUND UP
Turbine control systems for Mongolia’s largest thermal power plant
Yokogawa has received an order to supply turbine control systems
for thermal power plant No. 4, the largest thermal power plant
in Mongolia. This 2,1 billion yen project is being undertaken to
improve the efficiency of this facility’s operations.
Located in Mongolia’s capital city, Ulaanbaatar, thermal power
plant No. 4 has a total capacity of 703 MW and accounts for ap-
proximately 70% of the electricity output to the central energy
system in Mongolia. The plant also
supplies 1 373 Gcal/h (12 000 t/h) of hot
water for the district heating system in
Ulaanbaatar, meeting about 65% of the
city’s heating demand.Temperatures in
this region fall as low as −40ºC in mid-
winter, so this power plant is a crucial
lifeline for the city’s residents.
This project, which is financed by a
Japanese ODA loan from the Japan In-
ternational CooperationAgency (JICA),
will improve the efficiency of power
generation and stabilise the supply of
electricity and hot water by this plant.
For six of the plant’s turbines, obsolete
mechanical speed governors will be
converted to electronic governors, and
control systems and instrumentation
will be replaced. In addition to supply-
ing the CENTUMVP integrated produc-
tion control system for the control and
monitoring of the turbine governors
and auxiliary facilities such as the feed water pump control system,
Yokogawa will provide field devices such as DPharp EJA series dif-
ferential pressure/pressure transmitters, FLXA21/FLXA202 liquid
analysers, control valves, and safety valves.Yokogawa will also have
full responsibility for the implementation of this renovation project.
Enquiries: Christie Cronje.Tel. +27 (0) 11 831 6300 or email
‘Wear-n-tear’ free monitor for liquid media
KOBOLD Instrumentation, represented in South Africa by
Instrotech – a Comtest Group company, has on offer its model
NCW capacitive level monitors for liquid media, ensuring secure
protection against overfilling or unintended emptying of tanks or
reservoirs.The proven capacitive measuring principle for limit level
detection works almost wear-and-tear free. PTFE-coating isolates
the stainless steel probes from the medium
and guarantees a high chemical resistance.
Four versions enable an individual choice
appropriate to the measuring task. In addi-
tion to the single probe standard solution
for metallic tanks, double probe versions
for non-metallic tanks and for aggressive
media are also available. For media with
low dielectric constants, the units can also
be delivered with a coaxial reference tube.
A high temperature version designed for
fluid temperature of max. 125°C tops off the
all-round program.
The length of the measuring probes can
be individually configured up to 4 000 mm
according to requirements. The devices are
compact and beside assembly from the top,
the short probes can also be installed from
the side. A pluggable electronic module is
situated outside the tank in the connection head.The potentiometer
and DIP switches of the electronicmodule enable precise adjustment
of this reliable limit level detector to the respective medium. The
measuring system is based on the capacitive measuring method.
Enquiries:Tel. +27 (0) 10 595 1831 or email
FLOW MEASUREMENT
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