Nitrogen and denitrification in the cement industry is under pressure

In recent days, the Ministry of Environmental Protection has issued 14 low-carbon cement product demonstration certificates to 14 leading cement manufacturers in China. These companies have made significant progress in reducing energy consumption and carbon dioxide emissions, setting a positive example for the industry. The new environmental labeling standards also emphasize mine restoration, requiring that all cement plants achieve a 100% reclamation rate once their operations are completed. This initiative is not only an environmental milestone but also a step toward sustainable development in the construction sector. Reducing carbon dioxide emissions from the cement industry is crucial for achieving national targets on greenhouse gas reduction. If the full implementation of environmental label certification is realized, it's estimated that at least 20.7 million tons of CO₂ could be cut annually, assuming 30% of cement products are certified. This represents a major leap forward in the fight against climate change. Similarly, controlling nitrogen oxide (NOx) emissions from cement production plays a vital role in meeting national air quality goals. According to data released by the State Office of Environmental Protection in June 2023, China’s NOx emissions reached 24.043 million tons in 2011, marking a 5.73% increase compared to 2010. As the second-largest source of NOx after thermal power plants, the cement industry has become a key focus for emission control efforts. Effective measures in this sector can significantly lower overall emissions, making it a priority for environmental regulators. To address these challenges, several provinces across China, including Hebei, Shaanxi, Sichuan, and Fujian, have established denitrification pilot lines. These projects demonstrate the feasibility of reducing NOx emissions through technological upgrades. For instance, the 6,000t/d production line in Fujian Longlin achieved a denitrification efficiency of 65%, with NOx concentrations dropping to 185mg/Nm³. In Guangxi, the 2,000t/d production line of Sepangnan saw NOx levels fall from 1,200–1,650mg/Nm³ to 200–350mg/Nm³ after the upgrade. Similar improvements were reported in other regions, showing the potential for widespread application. These pilot lines serve as models for the entire industry, and when proven effective, they will be scaled up nationwide. There is no reason why other production lines cannot follow suit. Once the cement industry fully adopts NOx control measures, its contribution to environmental protection will be substantial, helping to improve air quality and reduce the impact of industrial pollution.

Control Valves

A control valve, is power-operated valve system applied to regulate or adjust the fluids flow in every industrial control process. The control valve can be diverse in Equal Percentage Flow Characteristic & Linear Flow Characteristic Control. The flow characteristic selection may concern to actual situation on site.

Control Valve, Automatic Control Valve, Flow control Valve

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