Cleanness For Heat Exchanger

1.The significance of heat exchanger cleaning

(1)Improve the appearance of the heat exchanger, purify and beautify the environment.

Removing the scaling on the inner and outer surfaces of the heat exchanger can keep original appearance and improve the appearance and purify the environment.

(2)Maintain normal production and extend chiller life.

Remove the scaling on the surface of the heat exchanger, maintain the surface properties, and ensure the implementation of subsequent production processes. Regularly clean up the scaling can maintain the normal operation of the chiller equipment, control chiller corrosion and extend the service life of the chiller.

(3)Increase production capacity and improve product quality.

Removal of contaminants on the surface of heat exchangers can achieve the purpose of maintaining good post-processing performance and improving product quality. Regular cleaning of heat exchanger can maintain its production capacity and reduce the impact of scaling on chiller performance.

(4)Reduce energy consumption and reduce production costs.

Regular cleaning of the heat exchanger can not only reduce the consumption of raw materials and energy, improve production efficiency, but also greatly reduce production costs.

2.The reason for heat exchanger cleaning

With the rapid development of modern industry, the use of cooling water is increasing. At the same time, the scale existing in a large number of circulating heat exchange equipment cannot be scientifically cleaned, resulting in energy consumption and environmental damage, and chiller equipment is damaged. At the same time, the operating efficiency is reduced.

During the heat exchange process of the cooling water, the refrigerant fluid (chilled water) absorbs the heat of the working fluid (cooling water), causing its temperature to rise. At this time, the Ca(HCO3)2 and Mg(HCO3)2 originally dissolved in the water, under the action of temperature, CO2 is precipitated to form CaCO3 and MgCO3 which are slightly soluble in water. When these crystals are continuously deposited on the surface of the heat exchanger, a very heavy scale is formed, which not only affects the heat exchange efficiency, but also increases energy consumption, and even chiller stops, prodution stops due to insufficient cooling water flow and reduced pressure .

Scaling will cause equipment and pipelines to fail, the installation system will suffer from production decline, energy consumption, material consumption and other undesirable conditions. When the scaling corrosion is particularly serious, the process will be interrupted and the installation system will be forced to stop production, directly causing various economic losses. There may even be malignant production accidents.

In today's scientific development, it is almost impossible to completely avoid the generation of scaling. Therefore, the cleaning of heat exchanger has become an indispensable and important thing in industrial production, especially in petrochemical and thermoelectric plants.

3.The role and purpose of heat exchanger cleaning

(1)Resume production.

In the process of industrial production, sometimes due to emergencies caused by improper operation, individual equipment or local pipelines will become fouled and blocked, which will affect the normal operation of production. For the situation at this time, it is mainly to quickly remove the scaling, to ensure that the chiller can operate normally, and to restore the normal production state.

(2)Restore chiller production efficiency.

For example, fouling causes a decrease in the heat coefficient of heat transfer of the heat exchanger, a decrease in the circulation area of a pipe or an increase in circulation resistance, an increase in the consumption of enablers and materials, and a significant decrease in production efficiency. At this time, the production efficiency of the chiller is restored by cleaning and descaling.

4.Heat exchanger cleaning procedures

(1)Descaling and cleaning.

Add the configured descaling cleaning agent in proportion to the circulating water of the cleaning tank, and determine the cleaning cycle time and the amount of agent according to the amount of scaling. After confirming that all the dirt is cleaned, go to the next cleaning procedure.

(2)Clean with water.

Circulate clean water for 10 minutes to check the state of the system and see if there is any leakage. At the same time, clean the floating rust.

(3)Peel off anti-corrosion cleaning.

Add surface stripper and slow-release agent to the circulating water of the cleaning tank according to the ratio, and cycle for 20 minutes to separate the dirt and the cleaned parts, and at the same time, the surface of the object without scaling is treated with anti-corrosion to prevent cleaning during descaling The agent corrodes the cleaning parts.

(4)Passivation coating treatment.

Add passivation coating agent to prevent corrosion of pipelines and components and new rust formation.