Morpholine-ammonia synergistic chemical control method for the secondary loop thermal system of nuclear power plant

Abstract

The invention belongs to the technical field of nuclear power plant chemistry, and particularly relates to a nuclear power plant secondary circuit thermal system morpholine-ammonia synergistic chemical control method. A purpose of the present invention is to reduce the nuclear power plant secondary circuit thermal system equipment corrosion rate, reduce the amount of the corrosion product entering the steam generator, and reduce the mud residue deposition on the steam generator. According to the nuclear power plant secondary circuit thermal system morpholine-ammonia synergistic chemical control method, morpholine and ammonia are simultaneously added to the water of a nuclear power plant secondary circuit thermal system, wherein the morpholine concentration and the ammonia concentration in the nuclear power plant secondary circuit thermal system are synergistically controlled at 10-20 mg / kg and 2-5 mg / kg, such that the pH value of the water in the nuclear power plant secondary circuit thermal system is 9.7-10. With the method of the present invention, by synergistically controlling the concentrations, the corrosion on the whole secondary circuit thermal system equipment is minimized.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant chemistry, and in particular relates to a morpholine-ammonia synergistic chemical control method for a secondary circuit thermal system of a nuclear power plant. Background technique [0002] Statistics show that more than 80% of the damages of steam generator heat transfer tubes in nuclear power plants are caused by corrosion. Corrosion often occurs in the stagnation area of ​​the steam generator with sludge deposits, and the sludge deposits in the steam generator mainly come from the corrosion of the thermal system equipment of the secondary circuit of the nuclear power plant, especially the corrosion of the piping of the drainage system. There have been many cases of rupture of steam and water pipes due to corrosion at home and abroad. The condensate pipe of the thermal system of the second circuit of the 3# unit of the MIHAMA nuclear power plant in Japan was corroded and ruptured d...

AI Technical Summary

Problems solved by technology

Due to the fact that organic amines tend to distribute in the liquid phase in the vapor-liquid two-phase and organic amines are easy to decompose, it is difficult to control the pH balance of the entire secondary loop thermal system, and it is also difficult to control the pH value in a better anti-corrosion range. Still cause more serious corrosion in some systems

Images