What are the factors that affect the discharge temperature of falling film evaporators?
Thread Content
We use a falling-film evaporator to evaporate the excess nitric acid in the material, with high-pressure steam serving as the heat source. These days, the temperature of the material being processed keeps fluctuating; weather conditions can help improve it, but it remains unstable. Please, fellow sailors, help me solve this problem.
The temperature of the feed liquid is generally related to factors such as steam pressure, vacuum level, feed concentration and flow rate, as well as whether there is scaling in the evaporator. It is recommended to conduct analyses by combining data from past production records. I work in the field of online chemical cleaning of evaporators; if your company encounters scaling issues with its evaporators in the future, feel free to call for consultation. I hope we have the chance to help each other!
Steam pressure, system pressure, and the discharge flow rate of the residual liquid from the falling film evaporator are all related to this
When the flow rate is stable, vacuum level is the key factor; you can take a look first
Personally, I think it’s still necessary to start by controlling stress. Unstable fluctuations in high-pressure steam cause instability in the pressure and temperature of the vaporized substances, as well as instability in their properties.
It could be due to the vacuum level, or a blockage in the feed pipe section!
I think flow rate is also a factor! It also depends on what kind of slurry it is! In my opinion!
We also use counter-current falling-film evaporators. If there are no issues with the equipment, we should start by checking the steam pressure, the fluctuations in the liquid level in the reactor, and the vacuum level. These factors are interrelated; in our case, fluctuations in the liquid level directly affect the vacuum level, which in turn affects the temperature of the product being discharged
Vacuum level, heating medium, and feed rate all have an impact; try to keep the conditions at the same level for each production run
Our factory has falling-film evaporators and rising-film evaporators, which are used in two separate systems. The new process that uses a falling film evaporator system often faces the problem of an inability to increase the discharge temperature; solutions can be sought by examining factors such as vacuum level (which is generally stable and can be monitored via the separator), feed temperature and concentration (which can be measured quickly), increasing steam pressure, improving the drainage of condensate water, and addressing issues related to flow deviation and scaling.