First, the main source of recycled aluminum waste gas pollutants
Recycled aluminum refers to the metal aluminum obtained from the waste aluminum alloy, waste aluminum or aluminum-containing waste in the industrial production process after at least one smelting and casting refining, also known as secondary aluminum. The manufacturing principle of recycled aluminum in China is the same as that in other countries, and recycled aluminum is obtained by recycling waste aluminum, after pretreatment, melting, refining and other processes. In the manufacturing process of recycled aluminum in China, the exhaust gas produced may have an impact on the environment. Specifically, the waste aluminum in the loading and unloading, crushing, sorting and other raw material pretreatment process, will produce a lot of dust exhaust gas; In the smelting process, the flue gas produced after fuel combustion contains a lot of soot and oxides containing sulfur, carbon, phosphorus and nitrogen.
Second, what waste gas will be produced in the smelting process of the waste aluminum industry
The raw materials of recycled aluminum are complex, which will produce particulate waste gas and gas pollution waste gas in the production process. When the melting process is carried out, the flue gas produced after the combustion of the fuel contains a large amount of soot and oxides containing sulfur, carbon, phosphorus and nitrogen. The emission of nitrogen oxides mainly comes from the smelting process, at this stage, the fuel will be burned after the flue gas containing nitrogen oxides, smelting process will also add a certain amount of fluorine refining agent, so that the flue gas will contain fluoride. The smelting process will also produce granular waste gas, such as: Mg, Zn, Ca, Fe, Na, Mg, etc., will produce gas pollution waste gas, such as CO, CO2, NOx, SO2, HF and other hydrocarbons, these pollutants will have a greater impact on the environment, but also endanger the life safety of personnel.
Third, smoke and waste gas control
The smoke contains harmful substances such as sulfur dioxide, which can enter the human body through the respiratory tract and cause respiratory diseases. Air pollution not only destroys air pollution, but also causes damage to water, soil, organisms, etc., but also endangers human health and destroys the ecological environment.
（1） black smoke control
Our particle catcher is a new type of diesel engine dry exhaust gas purifier, which is independently developed and has all intellectual property rights with a new combination of materials and processes. When the engine is running, the electronic control system will automatically alarm and open the bypass when the PM carbon particle blockage causes high back pressure.
（2）nitrogen oxide treatment
Nitrogen oxide treatment (SCR) to control NOX in the tail gas, the use of NH3 or urea (usually a mass ratio of 32.5% urea aqueous solution) as a reducing agent, under a certain temperature and catalyst, the use of NH3 to reduce NOX to N2 and H2O.
SCR denitration system is equipped with a total fault alarm device and a touch screen alarm prompt function, which can monitor the operating status of core components (urea metering pump, nitrogen oxide sensor), and collect exhaust temperature before and after the catalytic converter, NOx concentration before and after the catalytic converter, O2 concentration before and after the catalytic converter, flue gas flow, urea tank level. Calculate the denitration rate and the converted concentration of NOx emission at the outlet. The SCR denitration system has a unique hydromechanical design, which allows the gas to pass through the catalyst uniformly to achieve the ideal denitration rate.
Finally,Flue gas control is an important part of environmental protection, effectively control air pollution, better protect our environment, protect human health, is the key to the harmonious development of our economy and environment.
Post time: Jan-12-2024