Study On A Treatmenting Technology Of Nitrogenous Malodor Gas Of Oil Refining Plants

In order to alleviate the odour pollution of Petrochemical Enterprise,the study of removal of nitrogenous malodor gas by absorption and adsorption by activated carbon were progressed.Based on the experiment we analysis the ability of the two motheds appling together application in industryWe get XSYS-3(H2O2 solution)as our absorption solution through massive screening experiments. The foundation experiment results indicated that the best experimental condition for XSYS-3 was as followed: the volume of absorption solution was 240~320ml,the concentration of H2O2 was 8%~12%,the inflow flux was 0.4ml·L-1. The removing efficiency of malodor gas could maintain above 90% while operated in room temperature. When dealing with NH3 which concentration was 2500~5000mg·m-3 and (CH3)3N which concentration was 300~1200 mg·m-3 we can get better removing effect. Otherwise dealing with mixed gas containing different concentration of NH3 and (CH3)3N also can get ideal removing effect,the removing efficiency maintain above 90% without exception. Designing and fabricating the padding tower on the base of the foundation experiment to do the absorption experiment in the padding tower . The padding tower condition experiment results indicated that The removing efficiency of malodor gas could maintain above 95.5% when the density changed from 0 to 16000 mg·m-3, the removing efficiency became higher when the gas residence time got longer, The malodor gas removing rate increased along with the liquid gas ratio,the best liquid gas ratio was 30L·m-3,and the pressure of the padding tower didn't change a lot during the course.The breakthrough behaviors of ACF-1 and other activated carbons of different origins were investigated in the laboratory experiment. The carbons modified with transitional metal compounds like FeCl3,CuSO4 were used to adsorb. The active carbon HXT-4 impregnated with 8%~20% CuSO4 have excellent adsorb deodorization capability, Influence of bed height, prehumidification, vacancy velocity, O2, the constitution and the concentration of the malodor gas on removal of malodor gas was studied,The surface properties were evaluated by means of Boehm titration, surface pH measuration and XRD( X-ray diffraction). The mechanism of adsorp and reaction was also discussed. The results of lab experiments indicated that the smaller the particle size was, the better the performance. The wooden-based and fruit-shell activated carbons performed better than the coal-based carbon.The breakthrough time became lower when the concentration of the inflow gas grow,the best concentration of the inflow gas should be 100~200 mg·m-3. The breakthrough time increased along with the bed height,and the breakthrough time linear with the bed height very well. Water added to carbon modified with CuSO4 will restrain the adsorb capability.It would be beneficial when airspeed reduced.The active carbon HXT-4 modified and the activated carbon fiber ACF-1 also have great capability in dealing with (CH3)3N or mixed malodor gas containing NH3 and (CH3)3N.We analysis and research the possibility to amalgamate the two methods dealing with malodor gas on the base of absorption and adsorption experiments,we thought it will be used in industry.