Factors Of Scale Inhibitor Performance And Its Mechanism

In industry such as Metallurgy, Chemistry, Electric power, Petroleum and light industry, the circulating cooling water is usually used to heat-exchange. It can save fresh water and reduce the wastewater due to circulating cooling. The concentration of scale ion would increase times resulting from evaporation and concentration. So the serious scale would appear and attach to pipeline or surface of heat-exchanger. The heat-exchange efficiency would reduce and deposit corrosion would occur under the scale, which disfunctions throughput and leads to safety trouble. An effective methods to inhibit scale is adding inhibitors, which can inhibit scale well at low dose and prevent so that it is widely used in water treatment.Inappropriate inhibitors or small dosage can not inhibit scale effectively and deposition would occur at higher dosage resulting in waste of inhibitors and grievous scale, deposition mechanism is not clear. So it is necessary to research how to choose inhibitors and decide its dosage reasonably and find out deposition mechanism of inhibitorsFour kinds of scale inhibitors, a Polyphosphate (STPP), a polycarboxyl (HPMA), a phosphine-carboxyl(PBTCA), and four phosphonates (PAPEMP, ATMP, EDTMP and HEDPA) are chosen to study the relation between dosage, performance of inhibitors and water quality of converter by carbonate precipitation method , also deposition mechanism has been researched at high dosage of inhibitors. Meanwhile microcosmic model bas been established to study inhibition mechanism by molecular mechanism and quantum mechanism...