Trend of Nitrogen Oxide Reduction Technologies in Cement Industry

Abstract

In the cement industry, NOx emission is recognized as an important problem, and NOx reduction technologies can be divided into process change, staged combustion, low NOx burner, selective non-catalytic reduction and selective catalytic reduction method. The operation of the selective non-catalytic reduction method, which is the most used in the cement industry, is expected to make it difficult to meet the emission standards to be strengthened in the future, and it is necessary to improve equipment such as SCR and secure technologies. Recently, we are developing technologies for simultaneous application of SNCR and SCR, dust and denitrification filter technology, and removal technology using NO oxidation.

Strength and Microstructural Changes in Cementitious Composites Containing Waste Oyster Shell Powder

“…CO 2 , generated during the process of heating limestone to produce clinker, can accelerate climate change and global warming as a greenhouse gas [6][7][8][9]. Cement factories emit air pollutants such as sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ), which, when present in high concentrations in the atmosphere, can lead to health problems and ecosystem pollution [10][11][12][13]. Consequently, cement production can lead to the destruction of natural environments and ecosystems; this emphasizes the need to reduce cement consumption by using alternative resources [14][15][16][17][18][19].…”

“…In South Korea, waste oyster shells (WOS) have become an urgent problem that needs to be addressed because of the excessive amount produced every year compared with the Buildings 2023, 13, 3078 2 of 20 limited storage space available. Approximately 300,000 tons of oyster shells are annually produced, which translates to a minimum of 300 kg of oyster shells generated every day [28].…”