Coal Heating and Immersion Heaters

Coal Heating

Coal has always been considered a critical source of energy, which plays an integral role in the economy of the nation.  Coal lies in the fossil fuel category where it remains one of the leading sources of electricity throughout the entire world.  Considering that, it is clear that coal is the main source of all carbon emissions around the globe.  Coal mostly consists of carbon, although it also contains other elements such as nitrogen, hydrogen, oxygen, and sulfur.

Coal Heating and Immersion Heaters Coal Heating and Immersion HeatersCoal was first used in ancient times around 3000-2000 BC (during the Bronze Age), even though it is still used frequently today due to it being readily available, as well as being cheap to produce.  Through mining, coal is extracted from the ground.  It can either be in open pits or underground.

What do over-the-side immersion heaters do?

These heaters are designed specifically for tanks that have an opening on the top and, are used when it is virtually impossible to install an immersion heater on the side of the tank.  In this particular type of immersion heater, the heated part of the unit is built along the bottom part of the tank or along the side of the tank.  The underlying goal is to make the fluid inside of the tank circulate and flow naturally to ease in the distribution process.  To connect power, you need lead wires or terminal houses.

Have you thought about flanged heaters?

Flanged immersion heaters come equipped with a hairpin that is bent using tubular elements brazed or welded into a flange.  Wiring boxes are used to form an electrical connection to the unit.  These heaters have bolts that allow them to connect easily to matching flange-welded nozzles or tank walls.  The heaters come in a variety of different sizes, voltages, terminal housings, and kilowatt ratings, as well as various sheath materials, which makes them one of the favorites for heating.

Flanged heaters were designed to be used in tanks that can require pressurization.  Their immersion method makes sure that the energy is closely monitored; controlling them is relatively easy.  Non-cooking coal is graded based on useful heat value, which means that grading is figured out based upon the ash content.  In terms of semi-cooking coal, it is graded based upon moisture and ash content.

How does heating with coal work?

Ventilation is by far the most important point to consider when it comes to coal heating, especially in underground mines.  High levels of ventilation result in heat being carried away via convection.  Less ventilation creates a reaction rate that lacks sufficient oxygen.  Experiments show that coal requires a ventilation rate of anywhere between 100 to 500 cubic centimeters per minute.  Using spontaneous heating tests carried out using various ventilation rates at optimal ambient temperature, the results were comparable with tests that didn’t have ventilation.  Experiments have proven that there is an optimal ventilation flow needed to achieve the maximum rate of temperature rise at the optimal ambient temperature.

Harsh chemicals tend to be more corrosive in nature, which is where immersion heaters fitted with elements that can easily be replaced come in handy.  Using these immersion heaters can aid in reaching optimal temperatures, which are easy to maintain within the desired timeframe.  Replaceable elements are a great choice, especially because the chemicals don’t require draining for heater maintenance.

Written by Ilan Toledano. Ilan specializes in the development in oil and gas industries, renewable energy, HVAC systems and government projects.

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