OG
OG system – standing for Oxygen Converter Gas recovery System – is the suppressed combustion type exhaust gas recovery system for the converters of steel makings shops.
Since 1962, the OG system has been jointly developed and improved by both Nippon Steel corporation (NSC) and Kawasaki Heavy Industries Ltd. (KHI). In 2004, the technologies were succeeded to JP Steel Plantech Co. (SPCO), and ever since, we SPCO are continuing to supply the state of art technologies of OG system to all of the world. Until now, more than 180 OG systems have been installed in all over the world.
The OG system, being installed just above the converter mouth, has functions to cool down, to clean up and to recover exhaust gas (mainly CO gas) with suppressed combustion rate.
The OG system can provide best solution to the customers in terms of both energy saving and environmental control recognized generally as recent trends.
Advantages
The OG system has the following features.
(1) Compact
Keeping suppressed combustion rate of LD gas, the facilities for OG system is much more compact than those for full-combustion type system, that make it possible to realize flexible arrangement with correspond to site.
(2) High performance of Hood gas pressure control by RSW.
RSW (ring slit washer) has a high efficiency of dust collection. Also, it has a role in controlling pressure in the Hood. Its high response and high reliability can prevent puffing out the exhaust gas from the converter’s mouth and air intrusion, that leads to achieve low combution rate constantly.
(3) Hight dust collecting performance
RSW, venturi scrubber type as a dust collector of OG system can keep high dust collecting performance even under frequent change of gas flows during blowing time.
(4) High safety
OG system can treat safely explosive exhaust gas (CO gas) because all the surface of ducts in OG is always moist condition so that there is no source of burning anytime.
(5) High efficiency of energy recovery
OG system can recover latent heat of highly concentrated CO gas (exhaust gas) and sensible heat by OG boiler. Moreover, by applying convection boiler, more sensible heat (steam) can be recover.
Basic specifications
| (1) Basic unit of recovered steam: | 70 – 100 kg/t-steel |
| (2) Basic unit of recovered gas: | 70 – 100 m3(N)/t-steel(2000kcal/m3(N) basis) |
| (3) Dust-collection performance | 30 – 50 mg/m3(N)(at outlet of the flare stack) |
[Exhaust gas discharge from Flare stack]
Low caloric gas at the beginning and ending of blowing is fully combusted and discharged from Flare stack. The above pictures show dust-collection performance improved by adopting latest “RSW”.
The order results
