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IMI Critical Engineering is a world-leading provider of critical flow control solutions that enable vital energy and process industries to operate safely, cleanly, reliably and more efficiently.
We design, manufacture and install customised, highly engineered solutions for new plant builds and also provide complete plant lifecycle service support. This ensures that our customers benefit from efficient maintenance, speedy issue resolution and plant optimisation at all times.
We deliver great solutions to our customers through a unique combination of engineering know-how and fluid controls technology. At the heart of our 'Engineering great solutions' ethos is customer value.
The unique combination of our IMI Critical Engineering companies' know-how and worldwide experience underpins our reputation as a leading global supplier to the major energy and industrial process sectors.
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Within the blast furnace process (integrated steel mills) an implementation of a Top-Gas Recovery Turbine plant provides a high potential economic and environmental solution to recover and gain power from existing energy. An expander turbine utilizes the pressure and thermal energy which is provided by the compressed “Top Gas” from a blast furnace. This gas expander is specially designed for all technical requirements to process the blast furnace gas. Highly resistant against dust particles and water drops the turbine blades and nozzles guarantee a very long lifetime (25 years and more). A Top-Gas Recovery Turbine has no negative effect on the blast furnace production, with the controllable nozzles at the Top-Gas Recovery Turbine giving an absolutley steady top pressure.
Low revolution of 1500/min (50Hz), 1800/min (60Hz)
Low pressure differential over the stages
Low dust deposit at the blades
All internals coated including blades and nozzles
Gas sealing device with low nitrogen consumption
Bearings outside of gas chambers
Double Flow Design compensates axial Ioads
Fast and exact Top Gas Pressure control
Long maintenance intervals
Less energy Iosses (no gearbox is necessary between turbine and generator)
No additives for spraying water necessary (cleaning of controllable nozzles)
The turbine expander recovers about 33% of the pressure energy which is supplied from the blower to the blast furnace. Blast furnace plants without Top-Gas Recovery Turbines lose this energy by gas expansion via control valves (inside the washer or with “Septum Valves”). The expander process doesn’t affect the calorific energy of the blast furnace gas. This recovery of electrical energy has no CO2 pollution
High-energy output – high efficiency
Reliable and proven technology
Compact design leads to an easy implementation into an existing structure
Long maintenance intervals and long lifetime
30 years experience in Top-Gas
Recovery Turbine business and 36 installed turbines worldwide
Return of investment within 3 years possible (depending on plant size)
Dual Duty Turbine - Only one installation serving two blast furnaces
Up to 100 Deg C blast furnace gas temperature
Up to 1.000.000 Nm³/h of blast furnace gas
up 2.50 bar(g) inlet blast furnace gas pressure
up to 35 MW
Axial single flow, multi stages expansion turbine
1500 rpm for 50 Hz; 1800 rpm for 60 Hz
IMI Z&J’s Dual Duty Turbine enables the simultaneous support of two blast furnaces. The production of 2 x 13 MW in combination with less maintenance and long service periods provides the advantage of less investment to our customers. Only one Top-Gas Recovery Turbine plant for two blast furnaces has to be built. Both blast furnaces use independent Top Pressure Controls.
IMI Critical Engineering, Lakeside, Solihull Parkway, Birmingham Business Park, Birmingham B37 7XZ
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