REGIONAL> Highlights
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REGIONAL> Highlights
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Shenhai Thermal power plant eyes on eco-friendly manufacturing
By YU TIANYU (China Daily)
Updated: 2008-05-26 10:59 Desulfurization The desulfurization facility for Shenhai's No 3 heat and power co-generation unit began working since last year, with an investment of 55 million yuan. Gas and soot produced by power generation process is transferred into the post-dust removal machine to get rid of 80 percent of the dust. In the desulfurization tower, sulfur dioxide in the gas reacts with quicklime, forming calcium sulfate or calcium sulfite. The process effectively reduces sulfur dioxide emissions and helps prevent acid rain. A cloth sack dust removal technology is used for a second filtration of sulfur dioxide and soot. Similar emissions cleaning projects for the plant's No 1 and No 2 units were launched at the end of last year and are expected to be completed later this year. Once complete in a year, emissions of sulfur dioxide at Shenhai are expected to be reduced by 90 percent. Liu Haifeng, a resident living nearby Shenhai says he used to see yellow smoke coming from chimneys, and black dust on the windowsills. But the situation is becoming better with the changes at the plant, Liu says. "Our next step is to adopt denitrogenation technologies, which are required by the government," Li says. Utilization of coal ash Shenhai Thermal power plant produces about 1,000 tons of coal ash a day, which causes serious pollution, says Li. They used to mix coal ash with water and transfer the sludge to a reservoir located at Hui Mountain scenic resort. But after the sludge dried, ash blew all around on windy days. Now the company is selling the stored ash to construction material producers and battery and brick factories and the ash has also been used in road construction and Shenhai is planning to turn the former reservoir into an artificial lake. Shenhai has also removed hundreds of inefficient small boilers and thousands of chimneys which used to discharge polluting smoke. A recycled waste water treatment and a recycle project have also been in use since 2006, with a capacity of 20,000 tons of waste water a day. It not only reclaims water used by the company, but also helps to process wastewater recycled from other enterprises. "We used to think that investing in environmental protection would be costly and for little benefit, " Li says. "But now, we don't regard it as pressure any more, and if you can combine environmental protection projects with your manufacturing and business, they will be lucrative."
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