What are the reasons why the temperature of the methanol process gas after cooling in the circulating water is 49°C?

What is the specific process flow? There is a high likelihood of wax formation; try removing the wax first and then observe

The main reasons for the high outlet temperature of the water cooler in summer are: 1. High temperatures in summer result in a high temperature of the circulating water； 2. Due to the overall increase in temperature, the gas temperature entering the water cooler is 1-5 degrees higher℃ ； 3. The design load for the circulating water system in this position is too low; during summer, the cooling load is high, making it difficult to provide sufficient cooling capacity ； 4. In summer, due to the high overall water demand, it is difficult to ensure a sufficient supply of water at once, which results in a reduction in the amount of cooling available ； 5. In summer, the high temperatures cause the gas density throughout the system to decrease, resulting in an increase in gas volume and a decrease in output ； 6. There is severe competition for water among the systems; those located at the end of the sequence, relative to the coolers, are forced to contribute more water ； 7. The water cooler system may develop wax deposits; these wax deposits adhere to the inside of the tubes and affect heat exchange efficiency ；

There is too much wax buildup; under online hot washing, the load is too high – reduce the load!

We reached 62 degrees at our worst

1. Currently, the temperature rises of the two water coolers A and B for the circulating water are 8°C and 10°C respectively. There is indeed severe competition for water among the end-systems relative to the water cooler, and it is suspected that this phenomenon is caused by a slow circulation flow rate. 2. The waxing phenomenon cannot be said to be absent; I’ll try online dewaxing today and see the results.

The temperature of the water entering the cooling system is high, the pressure is low, or there is air obstruction. The temperature at the exit of the air cooler is high (first stage of cooling). Scale has accumulated inside the heat exchanger, and the amount of by-product wax has increased, resulting in poor heat exchange efficiency

Online dewaxing yields significant results.

There are still problems with the circulating water system; the temperature difference is 12°C.

Analysis of the cold medium side: low flow rate, high feed water temperature, damaged baffles in the shell side (methanol water cooling), reduced flow properties of the circulating water, air resistance in the shell side, low pressure of the circulating water feed, and blockages caused by impurities due to poor water quality. Analysis on the heat medium side: An increase in the heat medium flow rate leads to tube bundle blockage, reduced heat transfer coefficients due to wax formation, and an excessively high inlet temperature of the heat medium (resulting in poor cooling performance)