某氨基酸生产企业废气改造治理工程

发布时间：2018-04-21 23:01

本文选题：恶臭 + 改造　；参考：《浙江大学》2016年硕士论文

【摘要】：随着雾霾天在我国覆盖区域的不断扩大及持续天数的增加,大气污染被广泛关注。引起雾霾天气的原因非常复杂,而化工废气是雾霾形成的重要原因之一化工有机废气(VOCs)在空气中参与形成二次有机气溶胶、易沉积于空气颗粒物表面、诱发光化学烟雾,成为大气污染不可忽视的重要污染源。本文对宁波市某氨基酸生产企业存在的恶臭气体污染严重问题进行整治,分析其在废气收集及治理中存在的问题,提出改造措施并对改造效果进行验证。针对废气收集存在的问题,对生产设备、废气收集方式、生产操作方式、污水站进行全面升级优化,淘汰落后生产设备、改进废气收集方式及生产操作方式、改进污水站氨吹脱塔处理含氨废水治理工艺。通过对废气收集实施全方位改造,无组织废气都能得到有效收集,恶臭气味明显减弱。对治理工艺进行重新设计,淘汰原有“一级碱洗”治理工艺。设计1#和2#废气处理系统,采用“碱洗+酸洗氧化+碱洗”新处理工艺,并确定1#废气处理系统的最佳工艺条件为一级碱洗塔：pH=8～9；二级酸洗氧化塔：pH=2-3,ORP=1000～1200 mV,氧化剂为次氯酸钠；三级碱洗塔：pH=9～10。2#废气处理系统最佳工艺条件为一级碱洗塔：pH=8～9；二级酸洗氧化塔：pH=2-3,ORP=1000～1200 mV,氧化剂为次氯酸钠；三级碱洗塔：pH=9～10。1#和2#废气处理系统吸收液更换频率均为：一级塔3天/次,二级塔5 天/次,三级塔7 天/次。对改造后的1#和2#废气处理系统进行验收监测,1#排放口的臭气浓度为724,非甲烷总烃浓度为86.7 mg/m3；2#废气排放口臭气浓度为174,非甲烷总烃浓度为58.2 mg/m3。两个排放口的臭气浓度和非甲烷总烃的浓度均可以满足排放标准要求。改造工程经济、环境、社会效益显著。改造工程一次性投资为151.8万元,运行成本为3836元/天,其中运行成本优于改造前。工程有利于周边环境的改善和员工的身体健康。因此,本论文中的改造工程可为氨基酸行业的废气治理提供一定的参考依据。
[Abstract]:With the continuous expansion of haze days in our country and the increase of the number of days, air pollution has been paid more and more attention. The causes of haze weather are very complicated, and chemical waste gas is one of the important reasons for the formation of haze. The chemical organic waste gas (VOC) is involved in the formation of secondary organic aerosols in the air, which is easy to deposit on the surface of air particles and induce photochemical smog. It has become an important pollution source which can not be ignored by air pollution. This paper deals with the serious problem of odor gas pollution in an amino acid production enterprise in Ningbo, analyzes the existing problems in waste gas collection and treatment, and puts forward some measures and verifies the effect of the reform. Aiming at the problems existing in waste gas collection, the production equipment, waste gas collection mode, production operation mode, sewage station are upgraded and optimized, the backward production equipment is eliminated, the waste gas collection mode and production operation mode are improved, To improve the treatment process of ammonia-containing wastewater by ammonia blowing tower in sewage station. Through the comprehensive transformation of waste gas collection, the unorganized waste gas can be effectively collected, and the odor is obviously weakened. Redesign the treatment process to eliminate the original "first-class alkaline wash" treatment process. The waste gas treatment system of 1# and 2# was designed, and the new treatment process of "alkali pickling, oxidation and alkali washing" was adopted. The optimum technological conditions of the system were determined as follows: the first grade alkaline washing tower: 1: 0 pH 8 ~ 9, the second stage acid pickling oxidation tower: 1% pH 2 ~ (3) ORP ~ (1 000) 1 200mV, and the oxidant sodium hypochlorite. The optimum technological conditions for the waste gas treatment system of the three-stage alkaline washing tower, pH10: 1: 1: 1: 1, pH 8, 9; the second stage, the oxidation tower, the pH, 2-3, ORP, 1 000 MV, and the oxidizing agent, sodium hypochlorite; and the replacement frequency of the absorbent of the third grade alkaline washing tower, 1: 00, pH, 9, 10. 1#, and of the 2# waste gas treatment system, are as follows: the first stage tower is 3 days per hour and the absorption solution of the exhaust gas treatment system is replaced at the rate of 3 days. Second class tower 5 days / time, third class tower 7 days / time. The odor concentration of the exhaust gas outlet is 724, the total hydrocarbon concentration of non-methane is 86.7 mg / m ~ 32# and the total hydrocarbon concentration of non-methane is 58.2 mg / m ~ (3). The odour concentration and the non-methane total hydrocarbon concentration can meet the emission standard requirements. The transformation project economy, the environment, the social benefit is remarkable. The one-time investment and operating cost of the retrofit project are 1.518 million yuan and 3836 yuan / day respectively, among which the operating cost is better than that before the transformation. The project is conducive to the improvement of the surrounding environment and the health of the staff. Therefore, the transformation project in this paper can provide a certain reference for the waste gas treatment of amino acid industry.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X783

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