| Emission reduction is to save energy and reduce emissions. Pollutant emission reduction is the key to adjust economic structure, transform the mode of development and improve the livelihood, and is the important means to improve the quality of the environment and solve regional environmental problems. In recent years, local and global regulations covering exhaust gas emissions from internal combustion engines have become increasingly stringent.
These regulations mainly focus on:
● NOx
● HC
● SOx
● Particles
Emissions and their surveillance. We have developed the power plant technology to ensure full compliance.
1 Selective Catalytic Reduction
Selective catalytic reduction ( SCR) is the most promising way of NOx abatement. Catalytic after-treatment of the exhaust gas breaks down harmful NOx into harmless nitrogen and water. A reducing agent is injected into the exhaust gas flow upstream from a catalytic reactor. Together with the catalyst, this agent causes the breakdown of the NOx.
With SCR, the engine can operate at partial and full load and maximum efficiency. With this technology a NOx reduction ratio of up to 97% is achievable.
2 Oxidation catalysts
Where excellent thermal efficiency is requested and/or emission limits for carbon monoxide, hydrocarbons or formaldehyde are given in combination with low-sulfur fuels (gas or liquid), oxidation catalysts are the key to success.
Depending on the individual requirements Soar will choose the best oxidation catalyst in function and price for your application, out of a system of differently coated catalysts. A monitoring system will indicate when the catalyst has to be cleaned or replaced. Oxidation catalysts can be easily combined with SCR systems, if necessary.
3 Desulfurization
SOx emissions are caused by the sulfur content in the fuel and cannot be influenced by the engine. Any sulphur burned in the combustion process will be emitted as SOx. Low-sulphur fuel is usually expensive and not always available, and removing sulphur from the fuel can be costly. The sulphur has to be removed from the exhaust gas by the appropriate technique to fulfill different emission limits.
Two established methods are available:
● Conditioned dry scrubbing with hydrated lime powder.
● Dry scrubbing with sodium bicarbonate powder.
The choice of the suitable desulfurization method depends mainly on the water and absorbent availability.
4 Particle Filtration
Particle emissions are especially formed in heavy fuel oil applications due to the ash content of the fuel and its combustion characteristics. Two different systems can reduce these already low particle emissions further:
● Electrostatic precipitator (ESP)
For high exhaust gas temperature applications, the electrofiltration using the electrostatic attraction of ionized paticles is the best choice.
● Bag filtration
Where low exhaust gas temperatures are given, for example in CHP applications, bag filters are applicable. If necessary, these can be easily combined with a DeSOx system.
● Emission monitoring
To fulfill local regulations regarding proof of exhaust gas emissions, and to ensure an ideal operation of exhaust gas treatment units, We will choose the best solution for your demands in price and practice. The function and reliability of these systems has been proven. |
