| 摘要 |
<p>The present invention provides a method and apparatus for eliminating and recovering S02 from fume, including the following steps: l ) firstly, the fume containing low sulphur reacts with aqueous solution of ammonia, producing ammonia sulfite solution, ammonia/sulphur=1.3-1.8 (molar ratio), gas/liquid=2000-5000 (volume ratio); 2) the oxidizing reaction between the ammonium sulfite and air produces ammonia sulfate solution; 3) the ammonia sulfate solution is contacted heat fume, then the water-vaporized ammonia sulfate solution is delivered to crystallizer to be processed into ammonia sulfate fertilizer. The apparatus includes a desulphurizing tower, the desulphurizing tower includes S02 adsorption section, ammonia sulfite oxidizing section, ammonia sulfate solution condensing section, scrubbing section and demisting section. The apparatus can be operated easily. The cost can be reduced 10-30%.The vapor consumption can be reduced 90%. The concentration of S02 of fume can be reduced less than 10-100ppm. The quality of ammonia sulfate meets national standard.</p> |
