炼油厂恶臭废气综合治理技术的研究Ⅰ.酸性水罐区和轻质油品中间罐区废气治理技术

COMPREHENSIVE TREATMENT TECHNOLOGY FOR ODOUR POLLUTION OF WASTE GAS IN REFINERⅠ.STUDY OF TREATMENT TECHNOLOGY FOR WASTE GAS FROM SOUR WATER TANK AND LIGHT PRODUCT TANK

监测和分析了某典型炼油厂酸性水储罐和油品中间罐排放气组成和排放规律，采用罐区减排和“低温馏分油临界吸收-脱硫”等多种措施综合治理罐区排放废气。结果表明：罐区排放的恶臭污染物主要为硫化氢、甲硫醇、乙硫醇、二甲二硫、非甲烷烃等；酸性水罐排放废气中硫化氢浓度为100～4.21×10^4 mg/m3，有机硫化物浓度为112～1.39×10^3 mg/m3，非甲烷总烃浓度为（1.52～4.78）×10^5 mg/m3；油品中间罐区排放废气中硫化氢浓度为175～3.36×10^3 mg/m3，有机硫化物浓度为128～1.13×10^3 mg/m3，非甲烷总烃浓度为（2.67～4.40）×10^5 mg/m3；经过“低温馏分油临界吸收-脱硫”净化后，硫化氢浓度低于3.0 mg/m3，净化率大于99.9％，有机硫化物浓度低于0.6 mg/m3，净化率大于99.5％，非甲烷总烃浓度低于2.35×10^4 mg/m3，净化率大于95.1％。

Fugitive odor emission behavior from sour water tanks and product intermediate tanks were comprehensively monitored and evaluated in a typical refinery. The comprehensive measures inclu-ding reducing emissions of exhaust gas in tanks area and the absorbing process by low temperature dis-tillate oils followed by desulfurization are used. The main odor pollutant in the tanks area is hydrogen sulfide,methyl mercaptan,ethyl mercaptan and dimethyl disulfide as well as non-methane hydrocarbons （NMHC）. It is found that the hydrogen sulfide concentration in sour water tank is 175-3 360 mg/m3 ,organic sulfur compound concentration is 112-1 390 mg/m3 ,NMHC concentration is 2.67 × 10^5 -4.40×10^5 mg/m3. After purified by absorbing processe of low temperature distillate oils and then desul-furization,hydrogen sulfide concentration can be below 1 mg/m3 ,and purification efficiency reaches up to 99.9%. The organic sulfur compound concentration is less than 0.6 mg/m3 ,and purification efficien-cy is greater than 99.5%. NMHC concentration is lower than 2.35×10^4 mg/m3 ,and purification effi-ciency reached as high as 95.1%.