Ammonia gas reclaiming double tower distil process

The invention relates to a double-column distillation technology for ammonia recovery belonging to the field of ammonia recovery and distillation technology. NaOH is charged into the residual ammonia water from the condensing/blowing section of a coke plant and the mixture enters the column from the top of a first ammonia still to be heated and distilled; ammonia rich water of ammonia-washing from the ammonia-washing section of the coke plant enters the column from the top of a second ammonia still to be heated and distilled; the ammonia escaping from two ammonia stills after distillation enters an ammonia destruction or a combustion furnace to be burned; the ammonia water inwhich ammonia is removed from two ammonia stills is treated as sewage. The technology of the invention overcomes the deficiency of the prior art, greatly improves the efficiency and yield of the ammonia recovery, greatly reduces the difficulty of treating the ammonia water inwhich ammonia is distilled from two ammonia stills as sewage, si