Low-medium temperature application of selective catalytic reduction (SCR) denitration in cement flue gas was established and investigated in this study. The 2000h continuous operation shows the concentration of NO_x at the outlet can be maintained at 24 mg/Nm³ on average, while due to the increase of SO₂ in flue gas, the NO_x concentration increased to 57.5 mg/Nm³ after long time operation. The sulfur deposition is the main reason for catalyst deactivation, and SO₂ is still a big obstacle for low-medium temperature SCR application in cement flue gas. The denitration efficiency was tested as fluctuated from 73.5% to 86.2%, and ammonia concentration after SCR was as still as high as 22.5∼60.0 mg/Nm³ due to the excessive ammonia injection from selective non-catalytic reduction (SNCR), shows serious ammonia escape problem for SNCR, and the potential application of hybrid SNCR-SCR technology. In order to maintain the denitration efficiency above 85%, the gaseous hourly space velocity (GHSV) should not be exceeded 2800 h^-1, the electrostatic precipitators (ESP) setting at 60 kV was relatively appropriate, the temperature of the flue gas should be kept at above 200°C. The concentrations and toxic equivalent quantities (TEQs) of the PCDD/Fs congeners in the flue gas raised greatly after SCR reactor, indicating the PCDD/Fs concentration should be concerned during the application of low-medium temperature SCR, especially for the waste co-disposal processes.

建立并研究了水泥烟气中选择性催化还原（SCR）脱硝的中低温应用。在2000H连续操作显示NO的浓度_X在出口处可保持在24毫克/牛顿米³的平均值，而由于SO增加₂的烟道气中时，NO _X浓度增加至57.5毫克/牛顿米³长后时间操作。硫沉积是催化剂失活的主要原因，而SO ₂仍然是水泥烟气中低温SCR应用的一大障碍。测试了脱硝效率从73.5％波动至86.2％，由于选择性非催化还原（SNCR）过量注入氨，SCR后的氨浓度仍高达22.5〜60.0 mg / Nm ³，显示出严重的SNCR的氨逃逸问题，以及混合SNCR-SCR技术的潜在应用。为了使脱硝效率保持在85％以上，气态时空速度（GHSV）不应超过2800 h ^-1，将静电除尘器（ESP）设置为60 kV比较合适，烟气温度应保持在200°C以上。SCR反应器后烟道气中PCDD / Fs同系物的浓度和毒性当量（TEQs）大大增加，这表明在中低温度SCR的应用中应特别关注PCDD / Fs的浓度，特别是对于废渣处置过程。