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Successful Completion of Wanlida Paper Unit 5 Boiler Optimization

Wanlida Paper’s coal-fired cogenerating power plant unit 5, a 50MW T-fired boiler, was successfully optimized on August, 2011. The boiler combustion optimization project included the use of low-NOx burners (LNB) and selective non-catalytic reduction (SNCR). Low-NOx burners reduce NOx pollution formation in the boiler and NOx pollution is further reduced by the installation of the SNCR chemical reaction process in the boiler itself. These changes allow many plants to dramatically reduce NOx emissions without extensive modification and with limited cost. Such was the case at Wanlida Paper, located in Guangzhou (formerly Canton).

 

Guangzhou, as the largest city in Pearl River basin, is a hub in China’s most prosperous and dynamic economic center. This industrial region includes Hong Kong and produces about 1/3 of all China’s exports, but unfortunately is also one of China’s most polluted regions. In response to the Guangzhou City Government’s intention to lower local air pollution, Wanlida Paper awarded LP Amina with a contract to modify Wanlida’s power plant. Prior to modification, Wanlida’s NOx emissions averaged 700mg/m3. LP Amina guaranteed emissions would be reduced to 200mg/m3. Wanlida Paper and local government authorities have been delighted by actual performance figures, which has averaged 101mg/m3. Importantly, energy efficiency has also been increased. One important metric of energy efficiency for a power plant is the percentage of carbon contained in the plant’s ash. The higher the carbon ash the poorer the efficiency and also the less likely the ash will be sellable as a construction material additive. At Wanlida unburned carbon (UBC) was reduced from 5% to 3.5%. Energy saving for this 50Mw plant will provide an annual reduction in coal costs of 3.2 Million RMB. (US$ 500,000 @ 6.4RMB to 1 US$.) Wanlida Paper’s coal-fired cogenerating power plant unit 5, a 50MW T-fired boiler, was successfully optimized on August, 2011. The boiler combustion optimization project included the use of low-NOx burners (LNB) and selective non-catalytic reduction (SNCR). Low-NOx burners reduce NOx pollution formation in the boiler and NOx pollution is further reduced by the installation of the SNCR chemical reaction process in the boiler itself. These changes allow many plants to dramatically reduce NOx emissions without extensive modification and with limited cost. Such was the case at Wanlida Paper.

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