Descaling agent for brine transportation pipeline, as well as usage method thereof

The invention discloses a descaling agent for a brine transportation pipeline. The descaling agent comprises the following raw materials in parts by weight: 15-20 parts of ethylenediamine tetraacetic acid disodium, 20-35 parts of nitrilotriacetic acid, 10-20 parts of sodium hydroxide and 8-15 parts of sodium chloride. A usage method of the descaling agent comprises the following steps: mixing the descaling agent with a defoaming agent and water according to a weight ratio of (1-1.2):(0.1-0.15):1000 to obtain a mixed liquid, and enabling the mixed liquid to be always in a flowing state in a to-be-cleaned brine transportation pipeline by adopting a single-pipe circulating technology or a two-pipe circulating technology, so that the scale dissolving effect of the mixed liquid can be improved. Based on the complexing principle, gypsum scale layers can be removed by the descaling agent, the descaling agent is convenient and safe to use, the descaling efficiency is high, the descaling quality is good, especially the gypsum scale layer in a mirabilite brine transportation pipeline can be entirely eliminated, the damage of the traditional acid pickling to the pipeline can be solved, the construction period is short, and the production of enterprises is hardly affected.