Total emission control for glass melting furnace using plasma PM conversion process

Tomoyuki Kuroki^{1, *}, Taiga Tanaka¹, Haruhiko Yamasaki¹, Hashira Yamamoto², Masaaki Okubo²

^* The author to whom correspondence should be addressed.

¹ Department of Mechanical Engineering, Osaka Metropolitan University, Japan
² Environmental Affairs Office, Nihon Yamamura Glass Co., Ltd., Japan

Abstract

In glass bottle manufacturing plants, products are formed by melting raw materials at approximately 1500 °C using heavy oil and liquefied natural gas (LNG) in a melting furnace. The exhaust gas generated during this process contains nitrogen oxides (NO_x), sulfur oxides (SO_x), and particulate matter (PM), which contribute to environmental contamination when released into the atmosphere. Conventional exhaust treatment systems for glass melting furnaces typically include wet or semi-dry desulfurization equipment utilizing sodium hydroxide (NaOH), a compound that readily reacts with sulfur dioxide (SO₂), and dust collectors such as electrostatic precipitators or bag filters that primarily collect sodium sulfite (Na₂SO₃) and sodium sulfate (Na₂SO₄) produced during the desulfurization process, effectively enabling desulfurization and PM removal. However, they lack an efficient method for NO_x removal due to the presence of catalyst poisons, including sticky dust, in the exhaust gas. This study proposes a plasma-chemical hybrid process (PCHP) for the simultaneous removal of NO_x and SO_x. This process integrates plasma oxidation with chemical reduction and can be incorporated into existing desulfurization reactors. Furthermore, this study applies PCHP to an operational glass melting furnace exhaust gas treatment system, achieving simultaneous removal of PM, NO_x, and SO₂.

Keywords - Plasma-chemical hybrid process, denitration, desulfurization, glass melting furnace.

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