Petroleum industry: How to achieve online monitoring in automated ammonia synthesis systems?
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As the title suggests: I am working on a renovation project for ammonia solution. Ammonia gas is introduced into the water tank to achieve an ammonia concentration of 2%. The function that needs to be implemented is to open and close valves as well as start and stop the pump once the specified concentration is reached. I asked Siemens Cologne, and they said they don’t have any online instruments. I’m seeking advice from experts: how should this type of process be handled?
Personal opinion: Using a dedicated online detector for ammonia concentration is expensive and may not be easy to find. An alternative approach is to use an online pH meter for indirect measurement and control. Since ammonia is an alkaline substance, the pH value of 2% ammonia can be determined first; this value is then used to generate a signal that is fed into the control device as the setpoint. A simple on/off control circuit can be established to control the valve that regulates the flow of concentrated ammonia