Questions in sulfur recovery (3)
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The acid water stripping unit is a single-tower stripping side-line ammonia extraction process. In actual production, what are the key points and difficulties in the operation of the ammonia refining unit? ? ? What accidents have you had? ? ? ? I hope all seniors will speak more and exchange production experience with each other! ! !
Temperature control of ammonia refining tower and long-term operation of ammonia compressor
Be sure to pay attention to the crystallization control temperature!
Upstairs, how to control the crystallization temperature and within what range can it be controlled? Can you explain it in detail?
Our ammonia refining has never been started. Due to the large load, the reaction temperature cannot be controlled (minus 10 degrees is required), and the effect of "water separation at high temperature and sulfur fixation at low temperature" is not good. It is said that it will be overhauled this year. The ammonia refining system is very corrosive. We have installed it for 8 years, and all the control valve cores are corroded. Basically, we need to redo the line for manual control.~
How many factories use low-temperature methanol to wash their desulfurization units?
Is it possible to meet the ammonia burning requirements by increasing the temperature of the reactor?
However, nowadays, sulfur recovery systems often have blockages in some places. For example, the remote transmission gauge at the root of the field pressure gauge is easy to get clogged. I don’t know how to accurately control the temperature and velocity of the air flow in the device to ensure that the pipe is not blocked?
In the acid water stripping device, the side line does not have to produce liquid ammonia, but ammonia water can also be produced, and the process is much simpler. If there is no outlet for the ammonia water, you can change it to the ammonia blowing process at the top of the tower. Hydrogen sulfide and ammonia come out from the top of the tower together, which is simpler. Our factory has both sets of processes, but ammonia blowing at the top of the tower is easier to operate. Note that the slip line at the top of the tower must be heated and insulated to prevent ammonium salt from crystallizing and clogging the pipeline.
The ammonia we have here is blown out from the top of the tower.
Requires 1250 degrees or above, and equipped with a special ammonia burning burner
We haven't started work yet. What are the difficulties in controlling low armor?
agree! The sewage stripping device of our unit also uses a single tower to strip hydrogen sulfide and ammonia from acidic water at the same time under normal pressure. The sulfur device only needs to be equipped with an ammonia burning burner. At high temperatures above 1250 degrees Celsius, ammonia can be completely decomposed.
Great post, thanks for sharing:handshake
Our unit is also like this, and now it is solid* , there is still a lot I don’t understand, learn from it * middle~~~~~~~~
After reading everyone’s posts above, I have a deep understanding. 1. If ammonia is pumped from the side line of a single tower, you must pay attention to the crystallized salt on the several trays at the ammonia pumping position and the extraction outlet. If the temperature is not controlled well, it will be easily blocked. It is best to add a desalted water backwash line at the extraction outlet.； 2. The operation of the tower must be stable, otherwise there will be large fluctuations in pressure and other parameters, which will easily loosen the screws fixing the tray, and some trays may even fall off. ； 3. If it is a single tower stripping, and all hydrogen sulfide and ammonia are extracted from the top of the tower, it is relatively simple. Just pay attention to the dead corners of the pipelines and instruments. These places are prone to salt formation and blockage, causing instrument failure. For the sulfur part, you need a high-temperature ammonia-burning burner, usually above 1250 degrees. It is said that Canada's high-power ammonia-burning burners are good, and we use imported ones.
Separate water at high temperature, solidify sulfur at low temperature, control the crystallization temperature below -7°C, and turn on the ammonia press to reduce the reflux of ammonia.
During the operation, be sure to prevent the acid gas from containing water, otherwise it will cause overpressure in the sulfur furnace. It is also necessary to control the temperature at the top of the tower and place the ammonium salt for crystallization.