How to control or mitigate insufficient circulation water flow rates in heat exchangers in chemical enterprises, or operation beyond design parameters
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I am attaching information regarding the operating status of one of our company’s current systems. I am not an expert in equipment; therefore, if there are any shortcomings in the information provided, please feel free to point them out； 1. The designed temperature difference for water inlet is 10°C, and many devices are operating above this design value ； 2. The operating temperature has exceeded the designed range ； 3. The flow rate of the equipment is severely insufficient ； 4. The main reason for this is the requirements of the production process (to meet values that are not at the designed level); it is not possible to fully open the CWR valve of the heat exchanger, so the opening degree is controlled through a control valve ； I wonder if other users have any suggestions or measures that could help alleviate this situation ； What comes to mind is: 1. Add valves between the parallel heat exchangers to shut down one of them in order to maintain the heat load and equipment flow rate ； 2. Clogging of the heat exchanger’s heat transfer tubes, with the aim of reducing the heat transfer area in order to increase flow rate ； However, the aforementioned method lacks feasibility ；
Online eradication is not possible; it is recommended to first stop the situation from worsening, by using reputable water treatment companies such as GE or Nalco to ensure that the quality of the circulating water does not deteriorate any further. 2. If there is a drain valve on the water inlet side of the heat exchanger, clean it periodically to remove wastewater. 3. When there is an opportunity to shut down the equipment, manually remove the dirt from the heat exchanger
It’s Naclo now, but I don’t really trust their technology – the pipes broke after just 3 months of use. At present, I’m the one who came up with the company’s water treatment solution； Water gun cleaning is necessary, but such working conditions are very detrimental to the operation of the equipment
The temperature is rising too much. It’s caused by an insufficient heat exchange area ； None of your current approaches are merely temporary fixes ； 1. For regular sewage discharge, it is not through the CWS port but rather the CWR port; high-flow water is used to wash away some of the scale buildup ； 2. It is recommended that you submit a proposal to increase the heat exchange area; otherwise, that area will definitely pose a risk of explosion at some point. 3. The concentration ratio of the overall circulating water should be reduced to lower the degree of concentration. It depends on your current concentration. I usually concentrate it by 2-3 times; in your case, I’ll concentrate it by 2-2.5 times. I use tap water for rehydrating it.
Study*study*: an appropriate flow rate in a circulating water system can also help save energy. .