Technological injectant device for controlling flow-induced corrosion failure of pipelines

The invention discloses a technological injectant device for controlling flow-induced corrosion failure of pipelines. An injectant sleeve is vertically arranged on the back of a 90-degree bend to form a combined elbow, the upper end of the combined elbow is fixedly connected with the lower end face of a lower flange, a sealing ring is arranged between an upper flange and the lower flange, an injectant pipeline is inserted into the elbow from the upper and lower flanges, the lower end face of the injectant pipeline is fixedly connected with an atomizing nozzle, two radial plates on the outer wall of the lower end of the injectant pipeline and the injectant sleeve form a floating support, the injectant pipeline is fixed in an upper flange hole, and the injectant pipeline located outside the upper flange is communicated with a third straight pipe section via a restriction orifice. Two ends of the elbow are communicated with a first straight pipe section and a second straight pipe section respectively. The injectant sleeve and the elbow are cast integrally, and reliability of high-pressure injectant is guaranteed; as the atomizing nozzle is arranged, injected injectant is atomized into small droplets to be fully mixed with an oil-gas phase medium in the elbow, and risk of dew point corrosion of the multiphase flow medium or corrosion caused by ammonium salt crystallization deposit is lowered; due to the restriction orifice, self-balancing effect during multi-point simultaneous injection when multiple air coolers or heat exchangers are connected in parallel is enhanced.