This series of articles is written by senior boiler tech (and all around swell guy) Justin Skinner. Thanks Justin.
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1 Boiler Basics Part 1 Types and Components This series of articles is written by senior boiler tech (and all around swell guy) Justin Skinner. Thanks Justin. There are quite a few different types of boilers out in the world. They come in all shapes, sizes, pressures, and types of fuel burned. I m going to go over some of the more common ones, their common components, and why it all matters. First, lets establish what a boiler is. A Boiler is defined as a fuel-burning apparatus or container for heating water, in particular. The in particular part is thrown in there because a lot of boiler systems heat a fluid other than water. Glycol, oil, and process chemicals to name a few. But to keep things fairly simple, we will stick with water. So your basic boiler burns a fuel source to heat water. A water heater, basically. But water heaters are used to produce domestic hot water for showers,sinks, and other household hot water uses. Boilers are used to produce hot water for space heating purposes, dehumidification, and other processes (or even potable water indirectly through and exchanger). For residential and commercial/industrial purposes, there are 2 types of boilers. The most common is the fire tube design. This would include the common sectional type boiler seen in most residential applications. The fuel is burned, and the hot gases pass through a series of flue passages or tubes that are generally steel. The steel composing the flue passages or tubes is heated by the gases passing through. This area does not contain any water, only heat and combustion gases. Water surrounds the flue gas area, but does not actually enter the area. Heat transfer to the water occurs by conduction,
2 primarily. The steel comprising the flue passages becomes heated, and transfers the heat to water. Hopefully these illustrations help. Commercial Style Fire tube
3 Residential style sectional, note flue passes As you can see, the tubes or sections that contain the hot flue gases are surrounded by water, which is how this boilers transfer the heat to water. The passages that contain the hot gases also act as the heat exchanger in the boiler. The FIRE (flue gases) is contained in the TUBE (tubes or passages). A water tube boiler is typically used in commercial and industrial applications, and not seen often in residential. As the name implies, the tubes contain the water being heated, and are surrounded by the hot combustion gases. This type often looks like a rectangular box with a burner mounted to it. Its virtually a large fire box with water tubes.
4 Water Tube Boiler Design Whats the difference in application and why use one type over the other? Water tubes are generally considered safer. They contain much less water than fire tubes, so if a disturbance occurs (tube breaks, boiler melt down) there isn t as much water/steam to have the potential to escape the boiler. The main determining factor of water or fire tube is application. Water tubes are able to handle much higher pressure ( 1000s of psi), and fire tubes generally aren t
5 designed to be used over 350 psi. Water tubes are available in much larger capacities than fire tubes, and are able to recover a lot faster from a large increase in load demand from a pressure stand point. Meaning if the pressure drops on a fire tube boiler, it takes longer to come back up than on a similarly rated water tube boiler. Fire tube boilers typically have lower operating and maintenance costs, have easier access to the fire and water sides for inspections, and its much easier to replace tubes on a fire tube than a water tube. Generally speaking, if you have fluctuating demand and large swings in steam requirements, a water tube is probably a better fit. If you have a pretty constant load requirement without a lot of swing in steam demands, a fire tube would work fine. My next article will cover boiler components and safeties. Justin
6 Water Tube Boilers
7 Fire Tube Boiler
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