先进国家VOC治理技术与设备 Advanced VOC treatment technology and equipment

     大气污染治理问题已经成为了我国当前的首要任务，虽然国内也拥有一定的VOC治理技术，如活性炭吸附等等，但相比较国外成熟的技术应用还有一定的差距。为此，国外的成熟治理技术，是值得我们借鉴的，以便更好的应对大气污染问题。

     VOCs种类繁多，分布面广，根据部分国外主要环境优先污染物名录，VOCs占80%以上。日本1974-l985年环境普查表明，在检出的化学毒物中，卤代烃类最多共52种，一般烃类次之共43种，含氮有机物(主要是硝基苯和苯胺类化合物)共40种，以上三类占总检出毒物的70%。VOCs污染严重，与NOx、CnHm在阳光作用下发生光化学反应，吸收地表红外辐射引起温室效应;破坏臭氧层形成臭氧空洞，引起人体致和动植物中毒。

  随着VOCs污染范围的不断扩大和人们对其危害的逐步认识，1979年联合国欧洲经济委员会在日内瓦召开跨国大气污染会议，重点讨论了VOCs控制问题，1991年11月通过了《VOCs跨国大气污染议定书》，要求签字国以1988年VOCs排放量为基准，到1999年每年削减30%;1990年，美国修订了清洁空气法(CAA)，要求到2000年将VOCs的排放量减少70%。为此，开发VOCs替代产品，寻找VOCs控制最优技术已成为解决VOCs污染的必由之路。 随着世界各国对VOC污染的日益重视和环保法规不断严格VOC的排放标准，VOC治理技术亦在逐渐改进和完善。

  有机废气处理难度大的主要是因为其种类繁多，来源广泛，而且一次性投资和操作费用高，基本上无回收利用价值。成分复杂的有机废气则更加难以净化、分离和回收。挥发性有机化合物(VOCs)作为有机化合物主要分支，是指在常温下饱和蒸气压大于70Pa、常压下沸点在260℃以内的有机化合物。从环境监测角度来讲，指以氢焰离子检测器测出的非烃类检出物的总称，包括烃类、氧烃类、含卤烃类、氮烃及硫烃类化合物。

西班牙、意大利以及日本等国家都采用颗粒碳吸附+氮气脱附+精馏塔这一套治理设备，可以实现溶剂回收率高达90%，吸附材料使用寿命10年。其中，氮气脱附溶剂回收具有以下特点：（1）避免了废水产生；（2）避免了酸性水对吸附材料和设备的腐蚀，延长了吸附材料和设备使用寿命；（3）深冷回收保证了回收率高达90%。精馏塔分离及提纯具有以下特点：1.回收单一溶剂；2.精馏主要是脱醇和去水；3.含水量≤0.1%；4.纯度≥99.5%；5.酸度≤0.05%；6.允许有1.5%以下的杂质（不明物）；7.达到使用标准。

   上海永爱健净化设备有限公司专业提供VOCs净化设备及技术。致力成为一家集研发设计、设备制造、工程承包及运营管理于一体的企业。公司拥有环境污染治理总承包资质、环境工程专项设计及多个相关专利证书，是环保协会会员单位。

Air pollution control have become the primary task of China. Although China also has certain VOC treatment technology, such as activated carbon adsorption, there is still a certain gap in the mature technology application of foreign countries. For this reason, the mature treatment technology of foreign countries is worth our reference in order to better deal with the problem of air pollution.

VOCs are various and widely distributed. According to the list of major environmental priority pollutants in some foreign countries, VOCs account for more than 80%. According to the environmental census of Japan in 1974-l985, there were 52 kinds of halogenated hydrocarbons at the most, 43 kinds of hydrocarbons at the second place, 40 kinds of nitrogenous organics (mainly nitrobenzene and aniline compounds), and the above three types accounted for 70% of the total toxic substances detected. VOCs are seriously polluted, and photochemical reactions with NOx and CnHm under the action of sunlight can cause greenhouse effect by absorbing infrared radiation from the surface. Damage ozone layer to form ozone hole, causing human and animal poisoning.
With the expansion of the scope of VOCs pollution and people gradually understanding of the harm, in 1979 the United Nations economic commission for Europe multinational pollution meeting in Geneva, focuses on the problem of controlling the VOCs, in November 1991, passed the VOCs multinational atmospheric pollution protocol, requires signatories to VOCs emissions in 1988 as a benchmark, to 1999 annually by 30%; In 1990, the United States amended its Clean Air Act (CAA) to require a 70% reduction in VOCs emissions by the year 2000. Therefore, developing VOCs alternative products and finding the optimal VOCs control technology has become the only way to solve VOCs pollution. With the increasing attention to VOC pollution and the environmental protection laws and regulations, the VOC emission standards have been improved and improved gradually.

Organic waste gas treatment is difficult mainly because of its wide variety, wide sources, and high one-time investment and operating costs, basically no recycling value. Complex organic waste gases are more difficult to clean, separate and recycle. Volatile organic compounds (VOCs) as a main branch of organic compounds, refers to the saturation vapor pressure at room temperature is greater than 70 pa, under normal boiling point of organic compounds in 260 ℃ or less. From the perspective of environmental monitoring, it refers to the general term of non-hydrocarbon detected by hydrogen flame ion detector, including hydrocarbon, oxygen hydrocarbon, halogenated hydrocarbon, nitrogen hydrocarbon and sulfur hydrocarbon.
Countries such as Spain, Italy and Japan adopt the treatment equipment of particle carbon adsorption + nitrogen desorption + distillation column, which can achieve the recovery rate of solvent up to 90% and the service life of adsorption materials is 10 years. Among them, nitrogen desorption solvent recovery has the following characteristics :(1) avoid waste water generation; (2) it avoids the corrosion of the adsorption materials and equipment by acidic water and extends the service life of the adsorption materials and equipment; (3) cryogenic recovery ensures a recovery rate of up to 90%. Separation and purification of distillation column has the following characteristics: 1. 2. The rectification is mainly dealcohol and water removal; 3. Water content is not more than 0.1%; 4. The purity is greater than or equal to 99.5%; 5. Acidity shall be no more than 0.05%; 6. Impurities (unknown substances) of less than 1.5% are allowed; 7. Meet the use standard.

Shanghai yongai jian cleaning equipment co., LTD. Is specialized in providing VOCs cleaning equipment and technology. We are committed to becoming an enterprise integrating r&d, design, equipment manufacturing, engineering contracting and operation management. The company has the general contracting qualification of environmental pollution control, special design of environmental engineering and a number of related patent certificates, and is a member of the environmental protection association.

发布于2017-11-27