NH_3多相氧化的实验研究

1引言煤燃烧过程中特别是流化床中为了减少SOZ的排放，一般采用向炉内加入石灰石等添加物的方法。这些添加物质的存在，使挥发分含氮物质的氧化机理异于纯单相氧化。因此研究钙基脱硫剂（CaCO。）及其生成物（CaSO。、煤灰）对NH。和HCN的多相氧化有助于了解实际锅炉煤燃烧过程中脱硫对氮氧化物生成的影响。Lin［‘］研究了石灰石和CaSO。对NH。氧化的影响。发现石灰石对NH。氧化生成NO具有相当大的催化作用，可使NH3MNO的转化率达65％，而C3SO4存在和空管时NH3氧化结果一致，表明CaSO。对NHa无氧化作用。IisJ‘」在研究Ca…

EXPERIMENTAL INVESTIGATION OF INTEROGENEOUS ON OXIDATION OF NH_3

After study of how Calcium-based sorbent (CaCO3) and soild materials (CaSO4 and Ash) influence the conversioin of ammonia to NO and N2O in a fixed bed reactor, the following important conclusions are obtained: (l) the catalytic effects of CaCO3, CaSO4 and Ash on ammonia to NO and N2O are CaSO4 >CaCO3 >Ash; (2) Below temperature of 1100 K, calcium-based sorbent and solid materials have some catalytic effects on ammonia to NO and N2O, when the temperature is increased above 1100 K, catalytic destruction of NOx. and N2O with CaCO3 and ash is stronger than catalytic formation. So it makes the emission of NO. and N2O low, (3) whether in high or low temperature, CaSO4 has strongcatalytic formation of NOx. and N2O.