Utilization of waste heat from the primary cooler
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Dear colleagues: There are three primary coolers associated with the 600,000-ton coking plant, each having a heat exchange area of 3,000 M2. We are considering a project to utilize the waste heat from these three coolers (using one heat pump with a capacity of 3 million kcal). Both manufacturers involved in the discussions have assured that they can achieve a capacity of 3 million kcal; however, one manufacturer plans to use the heat from two of the coolers, while the other requires the use of heat from all three coolers. I would like to seek advice on which approach is feasible, given that the temperature of the gas entering the coolers is 80–82°C, and the temperature of the gas after it passes through the circulating water cooling system must remain below 45°C. In other words, the modifications should not affect the existing operating conditions.
Previously, the residual heat from the pre-cooler was used for winter heating, which certainly had an impact on the heat exchange efficiency
Since Option 3 involves making full use of whatever is available, if two units are used, then the third unit remains unused, which is a waste. Under normal circumstances, a heat exchanger should be installed in front of the refrigeration unit as a supplement