There are so many things in the world of industrial business that most people know very little about and do not understand. However, it is a good thing to learn as much as you can about such things as Catastak SCR systems, fluid pumps, and the like. (One post-apocalyptic day, your knowledge of such things could save others.) To conserve time, only the information on SCR systems is provided below. 

What Does SCR Stand For?

First and foremost, it helps to understand what all of these industrial alphabet letter abbreviations mean. In the case of SCR, it is complicated. Each letter designates a component or function of the system, telling you either what it is, or what it does. 

"S" stands for "selective." Clearly, this system is selective about its actions or about substances it takes in and moves about. That, in itself, is easy enough to understand.

"C" stands for "catalytic." A catalyst is:

A catalyst is any substance that works to accelerate a chemical reaction. It can be organic, synthetic or metal. 

Therefore, anything catalytic requires a catalyst to create a catalytic reaction. When you know and understand this principle, and put it together with "selective," you begin to understand that whatever this system is, it is selective about what substance it accelerates into a chemical reaction.

Finally, "R" stands for "reduction." So you have a system that selectively chooses specific substances to accelerate into a chemical reaction, thereby reducing the substance. That makes sense. What may not make sense is the fact these systems are often linked to industrial boilers, which tends to confuse a lot of people, even when they understand what SCR stands for. 

The SCR System's Connection to Boilers

Because the material that is fed through a boiler system is heated, it will ultimately turn into a vapor, gas, or liquid. In an industrial setting, you might need a catalyst to produce this change in substances. More often than not, ammonia is one such substance used to create the catalysis or catalytic event.

Ergo, you connect the boiler to the SCR system and the ammonia tank and liquid pump. The SCR system reduces all of the nitrous oxide, using ammonia as the catalytic agent. The system in its entirety is focused on reducing nitrous oxide, which is where the selective property of the system comes into play. It does not reduce anything else; just nitrous oxide.