Beside small power producer, coal is widely use in cement and paper industry. SCG (Siam Cement Group) is one of the large company utilizing and commercializing of coal in Thailand. However, there are many more company utilizing coal fire boiler and not limited to only the SCG.
Yes, If it is a pressurized system, the water from the back boiler and your oil or gas fired boiler can be mixed. This can also be achieved by using a water to water plate exchanger to preheat the return water from your heating devices. If you have a forced air heating system in the house, a coil can be placed in the main trunk line of the duct work and heated by circulated water from the back boiler.
Using a metal detector.
Yes
It's Illegal,and you can get fired in seconds, if the boss finds out!
Because you are using the Hot water faster than the boiler can produce it. Turn the tap/faucet off a bit. Get the proper sized boiler
to cook food using steam pressure of course
Because if you don't it will leave mineral deposits in the boiler. This is why many boilers and water heaters have a sacrificial rod.
A double boiler is usually used to melt choclate. You can make one yourself by using two pots and boiling water.
Yes you can bleed a combi boiler. You do just the same as with a conventional boiler. However, the pressure will drop in your system, so you simply need to adjust it using the little tap (usually below the boiler) to bring it back again (Usually aronud 1.5)
By using the bleeder valve by the boiler
I would recommend using a double boiler. If a double boiler is unavailable, I would heat it on low heat and stir it frequently.
form_title=Have a Boiler Installed form_header=Set up a new heating system in your home by using steam generated by a boiler. What is the square footage of the space to be heated?=_ What kind of HVAC system is currently installed?=_ Is this boiler for a residence or commercial facility?= () Residence () Commerical () Other