Nitrogen oxides come from nature and human industrial production activities. The nitrogen oxides emitted by natural gas come from the decomposition of organic matter in soil and ocean, which belongs to the single cycle of nature. Man-made activities emit NO, as a product of complete combustion, fuel combustion at high temperature produces a large amount of nitrogen oxides, such as aircraft, internal combustion engines and industrial kilns, boiler combustion and other processes.
Causes of nitrogen oxides in exhaust gas:
First, the air factor
In the air, nitrogen accounted for 78%, oxygen accounted for 21%, in the boiler combustion, oxygen is required to fully burn, burning to high temperature, nitrogen and oxygen in the air reaction into nitrogen oxides.
Second, the fuel factor
In industrial processes, fuels contain nitrogen, which reacts with oxygen during combustion to produce nitrogen oxides. However, choose and burn temperature to feel the nitrogen oxide production high or low. For example, the nitrogen oxides produced by coal and natural gas will be different, and the same fuel, burned at different temperatures, will produce different nitrogen oxides, and the higher the combustion temperature, the more nitrogen oxides will be produced.
Third, the solution
In order to further solve the problem of controlling nitrogen oxide emissions, we control the NOx generated by generator exhaust gas and boiler combustion, and the nox exceeding the standard treatment process method – selective catalytic reduction method (referred to as: SCR), the use of NH3 or urea as a reducing agent, under a certain temperature and catalysis, the use of NH3 to reduce NOX to N2 and H2O, because NH3 is highly selective to preferentially reduce NOX, without reacting with O2 first. Coupled with an integrated system that can remove NOx from the exhaust gas of the internal combustion engine, NOx emissions are effectively controlled.
Four, PLC control system
The system is equipped with a total fault alarm lamp and a touch screen alarm prompt function, which can monitor the operating status of the core components (urea metering pump, nitrogen oxide sensor), the system collects the exhaust temperature before and after the catalytic converter, the NOx concentration before and after the catalytic converter, the O2 concentration before and after the catalytic converter, the flue gas flow, the urea tank level, the denitrification rate, and the outlet NOx emission converted concentration.
Our SCR system is suitable for common power 50KW-2500KW, suitable for a variety of domestic and foreign internal combustion engine brands, whether it is for internal combustion engine treatment, NOx treatment, as well as boiler kiln denitrification, we have rich practical experience, can meet the needs of different industries, The corresponding treatment process is completely different for different site conditions (furnace type, fuel, air volume, smoke temperature, etc.). We can make the best solution for different scenarios and working conditions.
Post time: Dec-28-2023