Abstract:

The flue gas desulphurization by ammonia method has high desulphurization efficiency，gives no secondary pollution and also provides good utilization of by-products. However，the ammonia loss and oxidation of ammonium sulfite have limited its applications for a long time. For the considerations of both equipment and technology，a multifunctional desulphurization tower targeting the problems has above been developed. A system with this new tower as a key element has been operated for three years for the desulphurization of a 260 t/h circulating fluidized bed boiler. The results shows that desulphurization rate of this system can reach to 95%—99%. The SO₂ content in the exhaust gas is between 50—190 mg/m³. The quality of by-product ammonium sulfite meets the national standard.