Discuss the factors affecting ammonium salt formation in nitric acid exhaust turbine systems and the methods to prevent it
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Ammonium salts tend to form in nitric acid exhaust turbine systems. Dear experts in the nitric acid industry, what factors influence the formation of ammonium salts? What is the concentration of ammonia in the exhaust gases? If ammonium salts are formed, how can they be removed? Should water or steam be used, and what should the pressure and temperature be? Where is the best place to inject it in the turbine? How much to spray, and what is the frequency of spraying?
Generally, if you drive frequently, ammonium salts tend to accumulate on the low-pressure reaction water cooler and the nitrogen oxide compressor; regular washing with water is usually sufficient
I am also troubled by the same problem; I seek a solution. Also, how are ammonium salts formed?
In nitric acid production, ammonium salts are present in the exhaust gas turbines; it is first necessary to determine where the ammonia comes from. By eliminating ammonia, the ammonium salts will also be removed. It is certain that the ammonia cannot originate from unoxidized ammonia in the oxidation furnace. If the system in question uses an exhaust gas treatment device that relies on ammonia for reduction, then it is essential to strictly control the temperature of this reduction device (usually above 250°C) as well as the NOX concentration in the exhaust gas after treatment. Stabilizing the amount of ammonia added can help reduce the formation of ammonium salts and lower ammonia consumption. The allowable level of ammonia in the exhaust gas, according to our standards, is less than 10 mg/m3. To remove ammonium salts, saturated steam is generally used for washing. Our exhaust gas turbines do not have a device for adding steam, but the compressors do; steam is added at the compressor inlet, along with the process gas, and there are pipes designed to drain condensate at each stage of the compressor.
Ammonium salts will definitely be formed, but the operating conditions can be adjusted to keep their concentration below a certain level. When driving, it is necessary to increase emissions control and properly regulate the temperature of the oxidation furnace. For those equipped with ammonia reduction devices, it is necessary to control the ammonia flow rate and reaction temperature.
Ammonium salts will definitely be formed, but the operating conditions can be adjusted to keep their concentration below a certain level. When driving, it is necessary to increase emissions control and properly regulate the temperature of the oxidation furnace. For those equipped with ammonia reduction devices, it is necessary to control the ammonia flow rate and reaction temperature.
Does your company have ammonia reduction equipment? If so, poor process control can easily lead to the formation of ammonium salts in the exhaust turbine unit; if not, please check the condition of the absorption tower and the gas-liquid separator.