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Siemens Receives Five Contracts from China for Dry-Type Dedusting Systems
Substantially Reduced Dust Emissions Combined with Gas Recovery
In the oxygen-steelmaking process, large quantities of gas are released from the LD (BOF) converters which contain high concentrations of dust and carbon monoxide. The converter gas is first processed in a dedusting facility to remove both coarse and fine dust particles. In a second step, the CO-rich gas is recovered and stored in a gasholder for subsequent energy applications. Siemens VAI is the leading supplier of DDS in China and has received most of the contracts awarded by Chinese steel producers in recent years. For five different Chinese steel producers Siemens VAI will provide engineering and supply key equipment for dry-type dedusting systems, including energy recovery, for new LD (BOF) converters currently under construction. The Siemens solution will reduce the dust content of the raw converter gas to a minimum in order to meet the stringent environmental requirements.
The largest project is being executed at the steel giant Shougang. The Beijing-based company is currently relocating production facilities to the adjacent Hebei province, where, in a joint venture with the Hebei-based Tangshan Iron and Steel Group, a new steel works named Shougang Jingtang United Iron and Steel Co. Ltd. is being erected on Caofeidian Island, some 80 kilometers south of Tangshan City. Three 300-ton converters in Phase I of this project, which are being supplied by Siemens VAI, are scheduled for start-up at the end of 2008. For Phase II of this project, dedusting and gas-recovery systems will be installed for two 300-ton converters on the basis of Siemens VAI engineering and special-equipment supply.
At Qian'an Iron & Steel Co., Ltd. (Shougang Group), located in the city of Qian'an to the east of Beijing in Hebei Province, two new 210-ton converters will be equipped by Siemens VAI with DDS and gas-recovery facilities.
At Hunan Valin Lianyuan Iron & Steel Co., Ltd. in Lianyuan, Hunan Province, two new 210-ton converters will be equipped with DDS, including gas-recovery systems.
Similarly, DDS with gas recovery will be installed in two 150-ton oxygen converters at Jiang Yin Xing Cheng Special Steel Works Co., Ltd., located in the coastal province of Jiangsu in the city of Jiang Yin.
Finally, at Wuhan Iron & Steel Group Echeng Iron & Steel Co., Ltd., located in the city of Echeng near Wuhan in Hubei Province, a new offgas-dedusting system, including gas recovery, is being installed to treat the offgas from a single 130-ton converter.
For all of these projects Siemens VAI will basically provide engineering of key equipment (e.g., evaporation cooler, electrostatic precipitator, gas cooler) and will supply special equipment such as ID fans and motors and for the gas-recovery system, special valves and the hydraulic station. Additionally, special measurement instrumentation, high-voltage generation units and electrical control cabinets for the electrostatic precipitators, the gas-analysis system and Level 1 automation will be supplied. Siemens VAI is also providing advisory services for the manufacturing, assembly, start-up and commissioning activities.
In the DDS process, the converter offgas is ducted from the cooling stack into an evaporation cooler where water and steam are sprayed into the gas stream by means of dual-flow nozzles. Coarse dust is also removed from the off-gas in the evaporation cooler. Fine dust is removed in an electrostatic precipitator by means of four high-voltage fields. The cleaned converter offgas is exhausted through the system by the induced-draft fan, and the composition of the gas is analyzed continuously. Depending on the CO content, a switchover station directs the cleaned converter gas either to the flare or to a gasholder for subsequent use in a steelmaking or power generation plant.
Further information on solutions for steelworks, rolling mills and processing lines is available at: http://www.siemens.com/metals
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