Dual-pressure nitric acid plant

This is a serious problem – the process parameters should be kept below 40°C and above 70°C. If the temperature is too low, the water in the nitrogen oxide gases is likely not to condense completely, which will affect the efficiency of the nitrogen oxide separator. As a result, nitrogen oxide gases containing liquid will enter the compressor, causing water hammer and disrupting the dynamic balance, thereby increasing vibrations. Secondly, the inlet temperature of the nitric oxide compressor is 70°C, indicating that the low-pressure reverse cooling effect is very poor, as well as issues such as leaks in the coils. Thirdly, it is estimated that the low-temperature cooler is suffering from corrosion, a problem encountered by many companies in nitric acid production facilities. I’m not sure whether the low-temperature cooler in your facility is of horizontal or vertical type; if it is vertical, the likelihood of corrosion is high, and there is a risk of dry burning at the very top. IV. Check whether the concentration of nitric acid under low-reflection conditions and the normal water flow rate have increased; generally, the acid concentration is around 32%. This 100% indicates that there is something wrong with your system; it is recommended to stop the machine and investigate the issue promptly, as otherwise it could lead to more serious problems with the equipment.

270,000 tons? I guess the tube at the top has burned out from dry heating. What material is the low-temperature heat exchanger made of? Could you check the low-refractive nitrate concentration? Tell me, is the circulating water discharged from the very top of your heat exchanger?

What are the liquid phase temperature and the low-backpressure outlet temperature of your company’s nitrogen oxide separator? It can’t be that it’s also 70 degrees, right? The inlet temperature of the nitric oxide compressor is affected by various disturbances; for example, the gas temperature in the balance tubes is around 160–175 degrees, and uneven mixing leads to inaccurate inlet temperatures for the compressor

The reasons could be multiple: 1. Poor heat transfer in the low-pressure reaction water condenser. 2. Leakage in the anti-surge valve of the nitric oxide compressor. 3. The steam injection valve at the inlet of the nitric oxide compressor does not close properly

The nitric acid production process is well-developed, and under normal conditions the various parameters show very little variation. If there are significant deviations from these parameters, it may indicate a problem in some part of the system. It is recommended to proceed with precision and carefully eliminate the causes of these factors

Sub-*aoic acid AN is produced; this acid decomposes and explodes at 60°C, so the temperature should not exceed 60°C℃