Control method for ammonia escape during ammonia-process carbon capture

The invention especially relates to a control method for ammonia escape during ammonia-process carbon capture, which belongs to the field of flue gas purification. The core points of the invention are that metal ions are used as an additive and a chosen inhibitor mainly comprises Co(II), Cu(II), Zn(II), Ni(II), etc. The method has a high ammonia escape control rate; when the concentration of the additive is 0.0025 to 0.1 mol/L, an optimal inhibition effect is obtained, an ammonia escape reduced rate can reach 40 to 65%, and a substantial ammonia inhibition effect can be stably maintained for a long time. The metallic additive does not influence removal efficiency of CO2 and desorption efficiency of decarburization absorption liquid; the additive can be cyclically used, so running cost of ammonia-process decarburization is not increased. The inhibitor is applicable to ammonia-process decarburization in a heat-engine plant and to inhibition of ammonia escape in the process of ammonia-process flue gas desulphurization in a power plant. According to the invention, on the basis of guaranteed removal efficiency, ammonia escape is greatly reduced, investment cost for an absorbent is reduced, and secondary pollution is mitigated.