Method for effectively preventing inner leakage of liquid ammonia water cooler

Abstract

The invention discloses a method for effectively preventing inner leakage of a liquid ammonia water cooler. The method comprises the following steps that an ammonia compression device communicates with a nitrogen input pipeline provided with a side hand valve; after an ammonia freezing system is stopped, a water inlet valve and a water outlet valve of a circular water cooler are opened; and the side hand valve is opened, and low-pressure nitrogen is introduced into the ammonia compression device through the nitrogen input pipeline. The method has the advantages of prolonging the service life of the circular water cooler, reducing the equipment maintenance and replacement costs, preventing the water quality of circulating water from being polluted, and prolonging the use cycle, and is suitable for an ammonia compression and refrigeration technological process.

Description

technical field [0001] The invention relates to a method, in particular to a method for effectively preventing internal leakage of a liquid ammonia water cooler. Background technique [0002] The ammonia compression refrigeration process using ammonia as the refrigerant is a common industrial refrigeration process. Because the refrigerant ammonia has a low boiling point at normal pressure, a large latent heat of vaporization, and high chemical stability, it is widely used in various The field of chemical production. [0003] In the two sets of ammonia and methanol synthesis devices in our factory, the refrigeration process used to provide cooling capacity for the methanol absorbent in the low-temperature methanol washing process is the ammonia compression refrigeration process. The four processes of condensation, throttling, and evaporation (providing cooling capacity) form a refrigeration cycle, which provides a cold source for the methanol absorbent in the low-temperature...

AI Technical Summary

Problems solved by technology

[0004] In the normal production process and during the shutdown of the device system, internal leakage of the circulating water cooler often occurs, causing the ammonia and nitrogen content in the circulating water to exceed the standard, causing the circulating water to be polluted and affecting the use

When the ammonia refrigeration system is shut down, if the circulating water in the gas ammonia circulating water cooler is stopped at the same time, the gas ammonia in the system will be caused, especially in the liquid ammonia tank, ammonia separator and other equipment behind the circulating water cooler. Returning to the circulating water cooler in series will cause the circulating water in the circulating water cooler to freeze, which will cause the heat exchange tube to break. At the same time, the liquid ammonia remaining in the circulating water cooler will continue to accumulate after the device is shut down, which will also cause The heat exchange tubes of the cooler are continuously corroded, which will also easily cause corrosion inside the circulating water cooler, especially the weld bead between the heat exchange tube and the partition is easily corroded, resulting in internal leakage of the circulating water cooler

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