STEEL + TECHNOLOGY 01/2020 EXTRACT

STEEL TECHNOLOGY | 35
Ironmaking
New BF lungs commence operations at
Trinec Iron and Steel Works
The lighting ceremony of the burner on 28 November morning started the process of drying the new hot blast
stove at blast furnace No. 6 of Trinec Iron and Steel Works, Czech Republic. The Kalugin-type hot blast stove
has replaced an old recuperator that has reached the end of service life.
The new air heater has significantly better
parameters than the old obsolete
equipment. “Kalugin is smaller unit
and has no combustion shaft. This means
that the burner is located directly in the
heater dome. The whole cycle is easier,
flue gas and subsequently heated air flows
in only one direction. This greatly reduces
both thermal energy consumption and heat
load of the heater dome and has lower heat
losses”, explains Radek Olszar, Director of
Investment and Strategy at Trinec Iron and
Steel Works. Its operation is thus more
economical and environmentally friendly.
The investment of more than 260 million
Czech koruna (approximately 10 million
euro) started with the demolition of the
original equipment a year ago, and the new
facility was commissioned while the BF
was under full operation. The new hot
blast stove will be put into operation after
drying the lining and connecting it to the
blast furnace in February 2020 as the second
in a row. The third one will be upgraded
next, completing the renewal of the
battery of hot blast stoves, leaving only
three of the existing four heaters.
The hot blast stove, also known as the
blast furnace lung, heats the air to 1,250°C,
utilizing the heat generated by the blast
furnace gas combustion. Every day, this
type of hot blast stove heats up to
1,500,000 m³ of air to generate the hot
blast. It is then transported by blowers to
the tuyeres of the blast furnace.
The blast furnace No. 6 at Trinec Iron
and Steel Works is operated by a staff of
43 employees working at the control room
and in the field. The furnace was blown in
for the first time in 1952, underwent overhauls
in 1963, 1973, 1985 and finally in
1999. The current campaign is expected
to end in 2021, with over 22 million tons of
hot metal production.
The new Kalugin recuperators were
supplied by the company of the same
The third new hot blast stove commenced operations in November 2019 (Picture: Trinec
Iron and Steel Works)
Revamp of blast furnace No. 4
The other one of the two blast furnaces of Trinec Iron & Steel Works
underwent extensive repairs in October last year. After a 14 years campaign,
the BF was relined, including the complete replacement of the carbon blocks
in the hearth. “The revamp will extend the service life of the blast furnace by
at least another five years,” sayd production director Česlav Marek. For repair
of the two tap holes, alternative technology was used by pouring heatresistant
concrete.
name based in Yekaterinburg, Russia.
Kalugin supplies its technology to customers
in Russia, China, India, Syria,
Indonesia, Japan, Ukraine, Brazil, Turkey
and Kazakhstan. However, Trinec Iron and
Steel Works is the first site in the European
Union where this recuperator was
built.
• Trinec Iron and Steel Works, Trinec,
Czech Republic
STEEL + TECHNOLOGY 2 (2020) No. 1