No, the propane tank is pressurised, that's how the propane gets out, so turn the knob and out it comes, you just place the tube into the opening on the back side of the forge (through a piece of steel pipe (NOT galvanised) you placed when building it, then the gas will push into there and out through the entrance. With a modern gas torch you should not need any kind of blower, although you could make one out of a small vacuum cleaner I suppose.
This set up will only do small blades mind you, not big choppers...