Along this article, we want to talk about one of the main enviromental challenges that CHP plants are facing nowadays.
The reduction of pollutants to the atmosphere, is a key aspect within the use of Natural Gas or Biogas Reciprocating Engines to produce Heat and Power.
Thoughout the last years the legislation in terms of Hazard emissions to the atmosphere all over the world has become more restrictive with lower limit values, therefore sometimes is compulsory find Solutions to cut down the different values under the legal limits.
In many cases, the solution that allows be inside the legal emission values is using a catalyst element.
The most common catalyst, are the next:
SELECTIVE CATALYTIC REDUCTION – SCR
Nitrogen Oxides are commonly the main headache about the atmospheric contamination when we talk about the emissions control of gas engines.
SCR catalyst (selective catalytic reduction), are used to cut down the NOx levels in the exhaust gases. The exhaust gases are mixed with a metered amount of Ad-Blue, afterwards the pollutant gases go throuhgh a Surface of a ceramic honeycomb, coated with noble metals where the NOx are reduced by hydrolysis.
The hydrolysis breaks down the urea, that reacts with the Nitrogen Oxides, turning them into Nitrogen and H2O. To control the levels of NOx a sensor is assembled, thanks to this sensor the Ad-Blue metering is calculated.
The correct Ad-Blue (urea) metering beside their distribution over the catalyst is the key to achive correct pollutant levels.
OXIDATION CATALYST
This kind of catalyst are used to reduce the values of Carbon Monoxide (CO) and un-burnt hydrocarbons, specially formaldehyde.
In the oxidation catalysts, the exhaust gases go through a oxidation element honeycomb, coated with noble metals where the catalytic oxidation is developed to create Hydrogen and Carbon Dioxide, cutting down the Hazard elements in the exhaust gases.
CONCLUSION
With the aim of ensure the engines are running within the legal pollutant limits, producing heat and power on a efficient way, «RS MOTOR» has the ability to carry out catalyst projects for the correct exhaust gas treatmet.
Below you will see some images from a recent instalation of a Oxidation Catalyst carried out by «RS MOTOR».
