Electric heating cartridges are usually limited to a power of a few kW.I wonder if there exist electric heating elements, in the form of bar or rods, which can provide a power output of 1 to a few MW each.Any suppliers?
I'm sure that's not a catalog item. The only uses for them I can think of is furnaces for melting aluminum or making steel. Try Carborundum company's silicon carbide resistors. I use them up to a few hundred watts in radar transmitters because they're non-inductive and take large surge currents. I've also made pretty big loads out of tanks of copper chloride dissolved in water, with copper electrodes. You can adjust the resistance by dumping in more CuCl or H2O, and dump a whole lot of heat; but that won't get to 1000C.
Just electrically connect a thousand of them in parallel. But do be sure that your electrical service has the capacity to deliver that amount of power. Most residential sites are sized for a maximum of 10 kW. When talking about Megawatts, you are talking about power ratings that are comparable to the power ratings of the power plants themselves.
You have hit on the problem. More power in the same space means the temperature would be a lot higher, and you quickly run into limits in the materials, where they melt or corrode quickly. you want an increase of a factor of 1000, from a few kW to a few MW. If the size doesn't change much, then you will wind up with temperatures a lot higher than 1000? and any conceivable material will have melted. Nichrome has a melting point of 1400?C, so you may be able to get 1000?C out of it, but megawatts?
