Bag filters provide cleaner air at plants
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E-mail Xinhua, June 9, 2013
Dust from construction sites will not decrease either given that the country is at a stage of fast urbanization, accompanied by building new apartment blocks, subways and other large projects.
China is making more efforts in cutting emission from factories through launching tougher industrial standards throughout the year. Plants now use both bag filters and electrostatic precipitators to reduce particulate discharge. Bag filters are encouraged in the new standards for better performance.
Industry figures showed that 90 percent of thermal power units with generating capacity of 800 million kw or higher in China are installed with electrostatic precipitators, according to a report of Minsheng Securities.
If all these units were added with bag filters, it would cost about 50 yuan ($8.15) for upgrading each kilowatt of generating capacity. That translates into a potential market of 36 billion yuan, said the report.
Located within the city of Taiyuan and close to densely-populated areas, Taiyuan Iron and Steel Group is taking the lead in using bag filters to reduce dust.
Ma said once the new bag filters are in place, the company will cut particulate emission from 20 mg for every cubic meter to 10 mg.
More companies in the country are installing bag filters.
In Xilian Heating Company in northwest China's Xi'an, iron boxes with bag filters inside are installed on coal-fired boilers.
The old filtering facility on the boiler can reduce particulate emission to 80 mg for every cubic meter. With the new box, emission can be cut down to 30 mg, according to the company.
The Xi'an Environmental Protection Bureau is encouraging technological upgrade at local heating companies and expects more bag filters to be installed before winter.
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