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[C-4.2 Control Techniques of SOx and NOx in East Asia and Their Evaluation]

[Contact Person]

Nobuo Kido
Chief, Advanced Combustion Systems Division
Thermal Energy and Combustion Engineering Dept., National Institute for Resources and Environment, AIST, MITI
16-3 Onogawa, Tsukuba, Ibaraki 305 Japan
Phone +81-298-58-8220, Fax +81-298-58-8209
E-mail kido@nire.go.jp

[Total Budget for FY1991-1993]

31,361,000 Yen (FY1993 10,403,000 Yen)

[Abstract]

　This report describes the control methods of SO₂ and NOx from coal combustion, which cause acid rain in the east asia, for developing countries. Desulfurization characteristics of some kinds of Chinese limestones were examined. Desulfurization capability of Chinese limestone was as well as that of Japanese one.
　Direct injection of fine absorbent such as limestone, dolomite and limehydrate to the pulverized coal combustor was tested. Up to 80% of sulfur removal was achieved when limestone was injected at Ca/S=4. Limehydrate showed the highest desulfurization capability among the tested absorbents. Sulfur removal was not extreamly avoided when the two staged combustion technique was adopted to reduce NO emission.
　Circulating fluidized bed combustion(CFBC) was tested. NO emission from CFBC was about 100ppm for typical Chinese coal.

[Key Words]

Acid rain, Coal Combustion, Desulfurizatron