title_body: Is it possible to roast coffee in an industrial glass kiln?
upvoted_answer: If you can run the kiln at sufficiently low temperatures and have a solution for stirring the beans, yes you could roast coffee beans.
  
  "Drinkable" on the other hand is a hard to quantify term.
  
  Ideally, you would roast the raw beans slowy until 200 - 230 C over a time window of 15 - 25 minutes, depending on desired darkness and roast type. 
  This allows for a long and slow Maillard reaction and reduces the content of chlorogenic acid.
  Your extremely hot kiln ("cold" glass techniques use temperatures over 800C!) woud be even harsher than industrial roasters with their "90 seconds at 400 C" method. No time for a good Maillard reaction and reduction of chlorogenic acid.
  
  So while you probably can roast (= darken) the beans in a kiln if you are really quick, the results would lack the aromatic profile desired in good quality roasts and the probability of having just a "burnt and sour" brew is extremely high.