Design of Magnesium Plant Waste Gas Treatment Workshop
The gas generated from magnesium plants mostly contains oxides of nitrogen and carbon, particulates, and other compounds such as sulfur dioxide, chlorine, hydrocarbons and escape of refrigerant. To effectively treat and manage the waste gas discharged from magnesium plants, it is important to build a comprehensive and safe waste gas treatment system including gas collection, pretreatment, treatment and purification, monitoring system and so on.
Firstly, the collection of exhaust gas from magnesium plant should be conducted in a safe and controlled manner. For example, cement plenums, exhaust fans and ducts should be used to effectively collect the exhaust gas and prevent cross contamination with other air streams. Moreover, the exhaust fan and ducts should be equipped with appropriate filters to reduce odors.
Secondly, the pretreatment step involves the pre-processing of the exhaust gas generated from magnesium plants. In the Pre-treatment, dust and particulate matter should be removed using cyclones and electrostatic precipitators or electro-bag filter in order to reduce their concentrations in the exhaust gas. The next pretreatment process includes selective catalytic oxidation (SCO), which is to reduce the content of nitrogen oxide (NOx) in the exhaust gas. This can be achieved by catalysts with a high NOx conversion rate, such as palladium, ceramic, rhodium etc.
Thirdly, the treatment stage involves various processes such as adsorption, condensation, UV radiation and chemical reactions. In this stage, volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) should be removed by absorption. Adsorption process is mainly carried out in activated carbon tower or activated alumina tower, which can help to reduce the concentration of VOCs and HAPs. Moreover, condensation process is also necessary in order to capture the unwanted exhaust gas and transform them into liquid form. During this process, refrigirators should be used in order to reduce the temperature of the exhaust gas.
Fourthly, after the approach of treatment based on physicao-chemcial processes, the exhaust gas is sent for further purification process. This process mainly involves the use of catalytic filters and scrubbers. Catalytic filters are used to further reduce the emissions of VOCs and HAPs, and it utilizes the catalytic oxidation mechanism in order to convert the pollutants into harmless products. Elemental scrubbers, in turn, are used to capture aerosols, acid gases, and other gaseous pollutants. These processes help to reduce the content of pollutants in the exhaust gas.
Last but not least, an effective monitoring system should be set up in magnesium plants to ensure the performance of the waste gas treatment workshop. This process generally includes the installation of appropriate sensors in the areas of collection, pretreatment, treatment and purification, monitoring and control, etc. In addition, it is necessary to establish a data collection and communication system that can effectively monitor the performance of the waste gas treatment system.
In conclusion, it is necessary for magnesium plants to establish an effective waste gas treatment workshop in order to reduce emissions and comply with environmental regulations. This system covers the collection, pretreatment, treatment and purification processes, and the performance of the workshop should be monitored by an efficient monitoring system. With an effective waste gas treatment worshop, it is possible to ensure a safe and clean work environment and minimize the effects of pollutants on the environment.
