For Emitter/Flow I've used two Planes with some Loop Cuts sized differently to have random fire width. Important thing is here real world scale. Both of them are 10m long and ~15cm width. Scale applied (!).
I've assigned Transparent material to them so they are not visible in render.
Domain has pretty high Resolution along with Smoke High Resolution. Settings like below.
Material is simple, without smoke.
Last part is Force Field > Wind with some Noise.
If you need any specific explanation, please ask in comments.