How to calculate the heat transfer rate at the upper end of the primary cooler in a 1.5 million tons/year coke oven gas process?
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In a 1.5 million tons/year coke oven gas process, how is the heat transfer rate at the upper part of the primary cooler calculated? It is known that the design temperature of the gas entering the primary cooler is 82°C, and the design temperature at the third stage after leaving the primary cooler is 75°C℃ ； The cooling water temperature for the third stage of the primary cooler is 60/70°C, with a heat exchange area of 989 m2; the gas flow rate is 52,000 Nm3/h. Due to renovation needs, it is desired to change the circulating water temperature for the third stage to 75/67°C. It is necessary to know the heat exchange capacities before and after the renovation What is the temperature at the 3rd stage of the gas output? Thank you!
You need to do a detailed calculation for this; there are detailed methods in chemical engineering
The circulating water temperature in section 3 is changed to 75/67°C. This temperature is likely not achievable unless the gas inlet temperature is increased. That affects the effectiveness of ammonia spray at the bridge gate.
1.5 million tons per year of coke oven gas, with a volume of 52,000 Nm3/h – is that a bit too low? What is the purpose of your 3-stage circulating water? Given the current situation, the only way to change the temperature of the water in stage 3 of the circulation system to 75/67°C is to reduce the heat load on that water.