Evaporative condenser is an advanced condensing galvanizing equipment. It absorbs heat through the interaction of refrigerant (ammonia vapor), water and air. A heat exchange device that takes the heat from the refrigerant (ammonia vapor) vapor and causes the refrigerant vapor to condense into a liquid state. Industrial chemical cleaning is not allowed to destroy the hot-dip galvanized layer, and the corrosion inhibition efficiency is more than 99.95%, which is a high-tech cleaning project.
(1) Decreased heat exchange efficiency After cooling water system scaling, the thermal conductivity is very low, generally 0.1 ~ 2.0kaahm-1, h-1, k-1, and the thermal conductivity of steel is 40 ~ 50kahm-1, h-1 , K-1, that is, the thermal conductivity of the scale is hundreds or even thousands of times lower than that of the heat exchange material. In severe cases, it is difficult to achieve the cooling effect.
(2) Damage to the service life of the equipment. The equipment runs with scale for a long time, which is prone to corrosion under the scale and damages the equipment body. The corrosion rate is many times greater than that when there is no scale. Among the most harmful ones are intergranular corrosion, selective corrosion, stress corrosion, and pitting corrosion. Can cause the system to rupture or perforate, which will cause serious damage.
Fouling analysis of cooling water system In the process of using cooling water, most of them have not been treated or not treated well. For example, there are a lot of calcium, magnesium ions, oxygen, carbon dioxide and chloride ions in the water, and micro-biotics. It is an unqualified cooling water. Because the cooling water evaporates quickly, the temperature is high, and the concentration rate of the water is high, and it is recycled. With the continuous evaporation of cooling water, the concentrations of various salts in the water gradually increase, and when the concentration is greater than the solubility, it will precipitate on the heat exchange surface and settle down. Some salts dissolved in water are precipitated due to thermal decomposition when passing through the heat transfer surface of the condenser.
For example: Ca (HCO3) 2 → CaCO3 + H2O + CO2 ↑. The scale on the surface of the heat exchanger is mainly: CaCO3, MgCO3, Mg (OH) 2, ZnO, Fe2O3, Fe3O4 cooling water system chemical cleaning process: equipment preparation before cooling water system cleaning: A, due to the original cooling water spray system The nozzles are unevenly distributed, leaving cleaning dead corners, which require local modification. This change does not affect future cooling effects.
B. In order to better protect the cleaning quality, a mobile cleaning spray system needs to be set up separately. To prevent residues and impurities from blocking the spray holes, a separate filter is installed in the liquid distribution tank (the original water tank) and the return pipe. network.
C. The fixed spray uses the original water distributor of the circulating water system. Check the nozzle for water before cleaning.
D. The mobile spraying system can be made from one of the original water distributors of the original equipment by making a movable external soft connection and installing a nozzle. In order to solve the dead angle when the original fixed nozzle sprays descaling or uneven cleaning and descaling; the movable spray nozzle can move at any time to spray the dead angles or uneven cleaning parts left by the fixed nozzle when spraying. Descaling to ensure cleaning quality. The external pipe of the movable spraying system should be a soft connection, and the pipe should be longer. The sides and bottom of the heat exchange coil can be rotated by 360-degree spray spray cleaning, so that the sides and bottom can be sprayed uniformly. Ensure that all parts of the heat exchange coils are effectively cleaned.
E. Note: The water pressure of the cleaning liquid of the mobile spray nozzle and the fixed spray system, and the water flow of the cleaning agent.