52results about How to "Reduce fouling speed" patented technology

The invention discloses a cleaning solution for removing calcium carbonate scale and a preparation method and application of the cleaning solution, and belongs to the field of chemical descaling. Thecleaning solution comprises, by mass, 3%-8% of phosphorus-free organic acid complexing agent, 10%-25% of phosphorus-free chelating agent, 2%-6% of penetration cosolvent, 0.05%-0.15% of corrosion inhibitor, and the balance water. The corrosion inhibitor is oleic acid imidazoline corrosion inhibitor and / or thiazole corrosion inhibitor. The penetration cosolvent is prepared by the following steps that anionic surfactant, polyols and clean water are added into a reaction still and heated to 30-50 DEG C, stirring is conducted for 20-40 minutes, sodium hexametaphosphate, sodium but and the clean water are added, the temperature is reduced to 15-25 DEG C, stirring is conducted for 30-50 minutes under the constant temperature conditions, and the penetration cosolvent is obtained; and the mass ratio of the anionic surfactant, the polyols to the clean water added for the first time is 1:10-20:20-30, the mass ratio of the sodium but, the sodium hexametaphosphate to the clean water added for the second time is 1:40-50:80-200, and the mass percent of the sodium but accounted for the penetration cosolvent is 0.16-0.3%. The cleaning solution is high in scale dissolving rate, good in scale inhibition effect, safe and environmentally friendly, and good in biodegradability.

The invention discloses a method and a system for the scale prevention and descaling of a film type evaporator. Two fluids sequentially pass a heat exchange surface at different flow rates, one is a main fluid with a relatively larger flow but a low flow rate, and the other is an auxiliary fluid with a relatively smaller flow but a high flow rate. First, the main fluid is sprayed on the heat exchange surface. Then, the auxiliary fluid is jet on the heat exchange surface at the high flow rate so as to scour off scale formed on the heat exchange surface. The method and the system have the beneficial effects that scaling speed is reduced, and descaling efficiency is increased; and under the condition of normal evaporation, the whole heat exchange surface is strongly interfered by the fluid which is jet at the high rate, and at a result of strong interference, the heat exchange efficiency of the main fluid is enhanced.