Temperature control of the water washing combined tower
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This post was last edited by wang*neng on 2010-9-24 19:20. What measures are generally taken to address overheating in water scrubbers?
Increase the water washing volume, reduce the HCl content in the syngas; if that still doesn’t work, then reduce the production flow rate.
The answer on the 2nd floor is accurate and concise; if there is still room for adjustment in the valves of the acid cooler, increase the flow rate of cooling water!
What if the temperature of the dilute acid is too high, and increasing the water flow doesn’t help?
Is there any equipment for absorbing acid before the wash tower? Could it be that this equipment is not effective at absorption, which leads to an increased load on the wash tower? And what about the heat exchanger in the wash tower?
This post was last edited by wang*neng on 2010-9-25 at 13:08. Increasing the water flow rate will raise the temperature of the dilute acid, having the opposite effect.
Reply to 6# yuguotianqing: As for the amount of water to use, you need to decide it based on the actual conditions of your production process. Lowering the temperature by using less water certainly helps, but it increases the load on subsequent equipment; it’s merely a reluctant and passive solution that can only provide short-term relief. The only safe approach is to increase the water washing volume while keeping the temperature within acceptable limits and ensuring that the tower is not flooded, and at the same time to reduce as much as possible the proportion and flow rate of hydrogen chloride in the syngas.
One thing that is not clear is whether the owner’s facility uses a wash tower – first deacidification tower – second deacidification tower process, or a combined absorption tower process In the case of a combined absorption tower process, there should be two cycles at this time: a concentrated acid cycle and a dilute acid cycle. The reason for the high temperature of the combined tower could be an excessive amount of HCL, or it might be that the dilute acid pump cannot deliver enough flow, or the circulation volume of the dilute acid is too low to remove heat in a timely manner. Solution: If there is a large excess of HCL, the DCS can be used to control the flow rate of HCL, while increasing the amount of make-up water. Once the temperature drops, alkali can be added again ； In the second case, adjust the dilute acid pump in a timely manner and increase the outlet diameter of the dilute acid to boost its circulation rate. Regarding the issue mentioned by the friend on the 6th floor about increased temperature due to more water supply, the rise in temperature is only temporary; as long as the HCL flow rate is controlled, the temperature will eventually drop again after some water is added. The above are some of my experiences. Everyone is welcome to point out any mistakes
It depends on the process used; if there is an acid absorption tower ahead and a water washing tower behind, it’s likely that the acid absorption tower isn’t functioning properly, as well as poor mixing ratios that result in an excess of HC. Additionally, the condensers in both the acid absorption tower and the water washing tower may not be performing well in terms of heat exchange. It’s necessary to control the mixing ratios and ensure proper operation of the acid absorption tower.
Increase the water inflow volume, and the temperature will drop.
I fully agree with the view of the friend on floor 8; I have encountered both of the situations mentioned by that friend. Especially in the case of dilute acid pumps, if increasing the water flow rate when the temperature is too high does not solve the problem, then it’s time to consider using a dilute acid pump!