Boilers are used throughout the world to produce steam or hot water. Nearly every manufacturing sector uses boilers to produce the most basic items we rely on every day, including food, oil, paper and durable goods. When selecting a boiler many factors must be considered. Our list of topics will help guide you to make an informed decision suitable for your specific boiler application.
The rental boiler industry, starting approximately fifty years ago, solved industry’s need for short-term or emergency steam needs. One of the first true mobile rental boilers was a 20,000 lb/hr, 300 psig design, watertube package boiler specifically designed by Nationwide Boiler for use on a highway-legal open deck trailer. This true road-worthy solution eliminated the time-consuming task of offloading skid-mounted boilers from railcars.
Watertube vs Firetube Steam Boilers
There are two main boiler types that you can choose from for your specific application; watertube and firetube boilers. Deciding which of these two types will work best for you is not as easy as it may seem. It is like comparing apples to oranges; you can’t simply compare prices with steam capacity, as there are significant differences to consider.
In a boiler, energy from the fuel is transferred to liquid water in order to create steam. Once the water is heated to boiling point, it is vaporized and turned into saturated steam. When saturated steam is heated above boiling point, dry steam is created and all traces of moisture are erased. This is called superheated steam.
Effective and efficient boiler operation requires the use of auxiliary steam plant equipment. For some projects, users can pipe their existing auxiliary steam plant equipment to the new or rental boiler for safe operation. In other cases, new or rental auxiliary steam plant equipment may be required.
As allowable stack emissions become more stringent, plant facilities seek the lowest possible emissions to meet the newest standards, to add plant capacity without increasing overall emissions, or to minimize NOx emissions offset costs. Selective Catalytic Reduction (SCR) Systems are designed to reduce green house gases from boilers, specifically NOx, CO and VOC.
The Clean Air Act by the EPA (last amended in 1990) created National Ambient Air Quality Standards (NAAQS) to address six principal “criteria” pollutants that they considered harmful for public health and the environment. State and local agencies use the information created by the EPA in developing emission reduction strategies, plans and programs to assure they meet NAAQS. Current criteria pollutants include: nitrogen compounds (NOx), Sulfur compounds (SOx) Carbon Monoxide (CO), Particulate Matter (PM), ozone (03) and lead.
Air pollution regulations vary by region and have become very stringent, especially in California and Texas. Enacted at the federal, state and local level, industrial and commercial boilers are required to meet specific emission requirements that vary for different fuels, boiler sizes, and in some instances total emissions limits from a facility.