Method and device for producing superior diammonium phosphate product by adding raffinate acid clear solution

The invention discloses a method and device for producing a high-grade superior diammonium phosphate product by adding a raffinate acid clear solution. The method particularly comprises the following steps: filtering a raffinate acid raw solution by a filter press to obtain a raffinate acid clear solution; delivering process water to a washing apparatus to be proportionally mixed with concentrated phosphoric acid so as to prepare a primary mixed acid washing solution, and absorbing dust/ammonia-containing waste gas from the main line of a diammonium phosphate device; delivering the raffinate acid clear solution and the washing apparatus primary mixed acid washing solution to a tubular reactor storage tank, and mixing the acids until the specific gravity and neutralization degree required by the reaction of the diammonium phosphate tubular reactor are achieved, thereby obtaining secondary mixed acids; and sending the properly proportioned secondary mixed acids into the tubular reactor to react with liquid ammo