Characteristics of the releasing of sulfur dioxide and nitric oxide and combustion by adding the calcium based organic compound to lignite

The effect of the calcium based organic compounds of the modified dolomite by acetate (MDA), calcium acetate (CA) and calcium propionate (CP) on the release of sulfur dioxide (SO₂) and nitric oxide (NO) during LK-lignite combustion has been investigated on a horizontal tuber furnace. And also, the combustion characteristics of them have been studied in a thermogravimetric analyzer. Calcium based organic compound can suppress the release of SO₂ and NO under the suitable conditions effectively. In the temperature range of 973~1 273 K, the calcium based organic can inhibit the release of SO₂. But when the temperature grows higher, the inhibition effect of the calcium based organic reduces except CA. In the lower temperature range of 973~1 173 K, the calcium based organic promotes the release of NO, but when the temperature is higher than 1 173 K, CA and CP show the inhibition of NO obviously. The inhibition effect of SO₂ and NO by calcium based organic generally increases with the increase of the mole ratio of calcium to sulfur (Ca/S). But when the Ca/S is between 2.0 and 2.5, MDA promotes the release of NO. With adding the calcium based organic to LK-lignite, when the Ca/S is 2.0, the ignition performance of LK-lignite improves, the ignition reduces 10~33 K, but its burn time is slightly lengthened.