Water is produced after the new catalyst is reduced
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Where is that water discharged after the new catalyst is reduced? How is it measured?? My supervisor said to measure the ammonia solution??
After catalytic reduction, the water is produced in gaseous form, rather than in a liquid state. It is necessary to analyze the water content in the water after condensation following sample collection.
Talk to the supervisor in charge of analysis; he knows where and how to conduct the tests. There should be an instrument for measuring water vapor content connected online, and it’s also necessary to measure the total amount of water produced. Weights and buckets will be needed for this purpose. This is related to ammonia levels or something similar; be careful not to freeze the water. The specifics depend on your factory’s processes. You need to wear a mask when weighing, as the smell is quite strong. Ask the people at your factory for more details.
Reduced water is discharged with ammonia components and in cold exchanges, and the concentration of ammonia solution is also analyzed by taking samples at these locations respectively.
In the condenser tower, ammonia can be discharged there
We analyze the water content in the gas at the outlet of the synthesis tower. The reduced water is sent to the ammonia solution concentration unit via ammonia venting. The water vapor concentration remains below 0.2 continuously; once the temperature at the bottom layer stays above 460 degrees for 8 hours, it can be considered that the reduction process is complete, and the system enters a light-load phase. When the concentration of the ammonia solution reaches 80%, it is sent to the storage tank.
The water vapor concentration in the gas is analyzed at the sampling point at the outlet of the synthesis tower; this concentration is an important indicator during the heating and reduction process of the new catalyst. Water is still released at the ammonia section and the cold exchange point, only it is not introduced into the ammonia tank; adjustments can be made at the main ammonia discharge pipe. When the ammonia concentration reaches 80%, it is transferred to the storage tank.
This post was last edited by snowdfr on 2009-5-6 at 15:13. When carrying out restoration work, samples must be taken for analysis at both the inlet and outlet of the synthesis tower, and this is done every half hour to measure the water vapor concentration at the inlet, thereby preventing water from entering the synthesis tower and causing the catalyst to oxidize repeatedly, which would reduce its activity. The outlet water vapor concentration is kept below 2.5 g/nm3; the reduction is considered complete when the outlet water vapor concentration measured after three hours is below 0.1 g/nm3. The water generated during reduction is discharged through the condensation tower and ammonia separator. The water produced at the beginning of the reduction process should be routed via drainage pipes or backflow pipes to a separate tank, as this initial water contains catalyst ash and rust, making it quite dirty. When the ammonia content in the output reaches 5.0 or higher, it can be directly discharged into the liquid ammonia storage tank. This post was last edited by snowdfr on 2009-4-15 at 19:05.]
The water obtained through heating and reduction should be routed through a temporary pipe after the cold exchange and ammonia separation process; of course, a metering tank and scales are also required. Most of this water is stored in a tank – in our case, it’s stored in the ammonia tank – and once a certain concentration is reached, it can be transferred to the ammonia storage tank. This amount of water generally needs to be compared with the theoretical water output, while the water vapor concentration in the entire system should be measured at the hot gas inlet of the gas-to-gas heat exchanger, that is, at the outlet of the waste boiler
During catalytic reduction, the refrigeration system must be activated to condense and separate the water vapor and ammonia from the exhaust gas. Therefore, the condensate is discharged at the outlet of the ammonia separator located after the ammonia cooler; since the water concentration is high at first, it can be collected in a container or drained through a drain line. In the later stages of reduction, as the ammonia concentration increases, it can be sent to the urea zone or stored in an ammonia storage tank. At the initial stage, when emissions are low, attention should be paid to environmental protection issues and the risk of ammonia-related accidents, as well as the measurement problems related to the water generated during the reduction process. In fact, this is just a rough assessment and has little practical significance. Because water and ammonia mix later on, it is impossible to measure. The main task is to analyze the water vapor concentrations at the inlet and outlet of the synthesis tower in order to determine the extent of reduction that has taken place.