NOx treatment | Innovative technology and method for NOX treatment in foundry


Release time:

2024-04-23

Foundry as an important part of today's manufacturing industry, in the process of metal melting, pouring, cooling, etc., will produce a lot of soot and harmful gases, these pollutants not only pose a threat to the health of workers, but also affect the air quality of the surrounding environment. With the development of economy, people's awareness of environmental protection has gradually increased, and the control of foundry dust has become particularly important.

Foundry as an important part of today's manufacturing industry, in the process of metal melting, pouring, cooling, etc., will produce a lot of soot and harmful gases, these pollutants not only pose a threat to the health of workers, but also affect the air quality of the surrounding environment. With the development of economy, people's awareness of environmental protection has gradually increased, and the control of foundry dust has become particularly important.

Casting industry in the casting process combustion of nitrogen oxides is one of the main pollutants, there are potential hazards to the environment and human health, nitrogen oxides can lead to acid rain, photochemical smog and other environmental problems, but also lead to respiratory irritants, long-term exposure will increase the risk of cardiovascular disease. In the process of metal melting, pouring, cooling and so on, as well as the dust generated in the process of cleaning castings, will lead to the production of soot, but these soot contains many harmful substances, such as heavy metals, silicon dioxide, carbon monoxide, etc., long-term exposure to these pollutants may lead to respiratory diseases, but also lead to skin diseases and even cancer.

The following technical methods and strategies are required for the transformation of low nitrogen in the foundry:

1. Low nitrogen combustion technology. In order to reduce the amount of NOx produced in the combustion process, technology such as controlling the air-fuel ratio and semi-premixed burners is usually used, which is suitable for industrial furnaces using natural gas as fuel in casting production, and generally can reduce the concentration of NOx in the flue gas by more than 30%.

2. Ultra-low nitrogen burner. The use of ultra-low nitrogen burners can further reduce nox emissions to less than 30mg/m³.

3. Improve combustion efficiency and reduce NOx emission by reforming existing boilers.

4. Use our SCR denitrification technology. In the process of combustion, selective catalytic reduction SCR denitrification technology is adopted. In ₃, NH or urea is used as a reducing substance and ₃ under a certain temperature or catalyst is reformulated into N₂ or H₂ ₃. In ₃, NH₃ is highly selective to reduce NOx without reacting with O₂ first. This allows SCR denitrification technology to advance and reduce nox emissions, which are typically used in large boilers or industrial kilns.

In the process of low nitrogen transformation, foundry enterprises need to consider their own specific circumstances, choose the appropriate technical route, and ensure that the expected emission reduction effect can be stable after the transformation. In order to meet the requirements of environmental regulations, reduce the impact on the environment, and protect workers and public health, measures must be taken to reduce nitrogen oxide emissions. In addition, foundry enterprises in the air pollution control, should consider the use of reasonable pollution control equipment and technology, pay attention to operation and monitoring, to ensure the effect of governance.