Significance Of Heat Exchanger Cleaning

First, the significance of heat exchanger cleaning

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

Removing the dirt on the inner and outer surfaces of the heat exchanger and restoring its original appearance can achieve the purpose of improving its appearance and purifying the environment.

2. Maintain normal production and extend equipment life

Removing dirt on the surface of raw materials can maintain the surface properties of materials and ensure the implementation of subsequent production processes. Regular or regular cleaning of the dirt of the production equipment can maintain the normal operation of the equipment, control the corrosion of the equipment, and prolong the service life of the equipment.

3. Increase production capacity and improve product quality.

Removing pollutants on the surface of raw materials can achieve the purpose of maintaining its good post-processing performance and improving product quality. Regular cleaning of equipment can maintain its proper production capacity and reduce the impact of dirt on product performance.

4. Reduce energy consumption and reduce production costs.

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

Second, the reason for cleaning the heat exchanger

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 exchange equipment cannot be cleaned scientifically, which leads to energy consumption and environmental damage. When the equipment is damaged while reducing operating efficiency. During the heat exchange process of the cooling water, since the refrigerant fluid (chilled water) absorbs the heat of the working fluid (cooling water), its temperature rises. At this time, the Ca(HCO3)2 and Mg(HCO3)2 originally dissolved in the water are Under the action of temperature, CO2 is precipitated to generate CaCO3 and MgCO3 which are slightly soluble in water. When these crystals are continuously deposited on the surface of the heat exchanger, a very hard scale is formed, which not only affects the heat exchange efficiency, but also increases energy consumption, and even causes shutdown and production shutdown due to insufficient cooling water flow and pressure drop .

Dirt will cause equipment and pipelines to fail, and the production of the device system will decrease, and energy consumption and material consumption will increase. There may even be a vicious production accident.

In today's scientific development, it is almost impossible to completely avoid the generation of dirt. Therefore, the cleaning of heat exchangers has become an indispensable and important link in industrial production, especially in petrochemical and thermal power plant production.

Third, The function 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 be fouled and blocked, which will affect the normal operation of production. For the situation at this time, the main thing is to quickly remove the dirt to ensure the normal operation of the production equipment and restore the normal production state.

2. Restore the production efficiency of the device.

For example, fouling causes a decrease in the heat transfer coefficient of the heat exchanger, a decrease in the flow area of the pipeline or an increase in the flow resistance, an increase in the consumption of energy and materials, and a significant decrease in production efficiency. At this time, the production efficiency of the production equipment can be restored by cleaning and descaling.

Fourth. Procedures for heat exchanger cleaning

1. Descaling and cleaning.

Add the configured descaling and cleaning agent in proportion to the circulating water in the cleaning tank, determine the time of the cleaning cycle and the amount of agent added according to the amount of dirt, confirm that all the dirt has been cleaned, and then go to the next cleaning procedure.

2. Wash with water.

It should be cleaned with clean water for 10 minutes, check the system status, whether there is any leakage, and clean the floating rust at the same time.

3. Strip anti-corrosion cleaning.

Add surface stripping agent and slow-release agent in the circulating water of the cleaning tank in proportion, and circulate the cleaning for 20 minutes to separate the dirt from the cleaned parts. At the same time, carry out anti-corrosion treatment on the surface of the object without scaling to prevent cleaning during descaling and cleaning The solvent will corrode the cleaning parts.

4. passivation coating treatment.

Add passivation coating agent to prevent pipeline and component corrosion and new rust formation.