The steel industry process is dependent on the high degree of heat, as
well as cooling. Approximately 2.2 million tonnes of steel per year are
produced at the Raahe steel plant. Hot-rolled steel sheets and coils are
manufactured for use in, among other things, the engineering,
transportation and construction industries. The Raahe plant also
manufactures a variety of special steels that are particularly
wear-resistant, specially coated or very strong and impact-resistant.
Hundreds of cooling devices
|Regional Supervisor at the Ruukki's Raahe steel plant, Ismo Vähäjylkkä, has a lot of responsibility. |
Photo: V-P Moilanen
and his supervisor, property manager Sauli Kallio, work with
approximately 2.400 other Ruukki workers on this large plant site. Its
surface area is more than 500 ha, and the total surface area of
buildings alone is 46 ha, with a capacity of about 5.75 million cubic
Nearly six million cubic meters can accommodate all
kinds of properties, from the office buildings to a variety of
production facilities. The most impressive of all the buildings is a
rolling mill of over 16 hectares. Many of the production facilities,
such as a blast furnace building, power plant, sinter plant and research
centre, were built in the 1960s. The coking plant buildings are
however, relatively new; they were completed in the 1980 and 90s. Some
of the offices are located in modular buildings.
buildings require some kind of cooling", explains Vähäjylkkä. There are
approximately 300 water chillers in the plant area, with a total cooling
output of 7.5 MW.
The total number includes the cooling of the
normal office spaces, different automation facilities, electricity and
IT facilities, and the cooling related to the process.
"The cooling water station for the main engine of the rolling mill, which was built in 2004, has the largest cooling output
(1 MW)", he says.
was involved in the investment decision on cooling units and in the
preparation for modernisation, and as a supervisor of the actual
project. He is also responsible for the assessment of HVAC conditions.
such a large production facility, something is always being renovated,
repaired or built. At the beginning of the year, investment decisions on
three cooling units were stood waiting on Vähäjylkkä´s desk. Old R-22
units are being replaced in the plant area. Last year, the blast
furnaces were renovated, which significantly improved the production
energy efficiency. The steel industry requires high temperatures, but
the process also depends on cooling.
According to the property manager, Kallio, the cooling investments are significant even at the annual level.
"Of course, the quantity fluctuates each year, but EUR 100.000 is an indicative number."Special skills
far, Ruukki has had its own planning organisation, but today the
long-term partners are responsible for the cooling design and
"It is very important that both designers and
contractors have vast experience of working with Ruukki. We can be
confident that they are familiar with the house rules and needs",
remarks Vähäjylkkä.Wide range of equipment and vast area
of the environment, processes and business practices is very important.
Devices are required to provide a very high level of operational
reliability. The damage caused by non-functional cooling is
considerable. The power supply simply cannot be interrupted. Also, the
cooling of the production facilities must not fail. Otherwise, a bridge
crane, for example, might suddenly end up in a problematic situation.
high quality, compact design and ease of installation are the reasons
why approximately one hundred of Chiller's cold water stations, and
dozens of cabinet machines at the Ruukki's Raahe plant, take care of the
cooling of these special facilities.
The latest cold water
stations, delivered in 2010, are under the Service Next™ ovarall
concecpt. Service Nex™ enables centralised monitoring and optimisation
of the entire plant's cooling system.
Ruukki in brief
- The Raahe plant is a part of Ruukki's steel business sector.
- Ruukki specialises in steel and steel construction.
- Ruukki employs approximately 9.000 people and has a wide distribution and dealer network in about 30 countries.
- In 2012, the group revenue was EUR 2.8 bn.
Ruukki Construction supplies steel structure solutions for commercial,
office and industrial buildings, port and waterway construction as well
as roofing products and services.
- Ruukki Metals manufactures
special steel products for private homes, such as wear-resistant and
specially-coated products for challenging, energy-efficient
- Chillquick™ cold-water stations with free cooling (CGIW-120, 300 kW)
- SMART Vari™ Standard air-conditioning machines with hot gas heating (energy control optimisation)
Nex™ overall concept explodes the unit into components and compares
their limits with BMS's changing information. Best way to optimise the
efficiency of the plant and control its thermal conditions is to analyse