Can the treatment of high-ammonia-nitrogen condensate be carried out using a stripping tower? How should the generated gas be handled?

Methods for treating transformed condensate include using distillation processes to condense the evaporated steam into ammonia water, but what is the overall efficiency of this approach? I haven’t visited it in person. But I have conducted experiments: by using waste heat to heat the condensate and then circulating it through a cooling tower, with fans used to extract air, it is also possible to reduce ammonia nitrogen levels to a level suitable for further treatment at the end stage (200 ppm ammonia nitrogen).

For the condensed liquid with high ammonia nitrogen levels in the conversion system, a water scrubber is required to wash away the ammonia, so that the NH3 concentration in the gas is less than 1 PPM. After that, the gas proceeds to the low-temperature methanol washing system, where acidic gases such as CO2 and H2S are removed from the gas. Once the specified standards are met, the gas is used for ammonia synthesis or methanol synthesis.

The transformed high-ammonia nitrogen condensate refers to the washing condensate from the transformation wash tower, right? This portion of the condensate contains a high level of ammonia; it must be sent to a condensate stripping tower where it is stripped using low-pressure steam. After stripping, the ammonia content in the condensate is reduced to less than 50 ppm, after which it can be sent back to the gasification process for reuse. The gas obtained from the stripping process can be sent for combustion in sulfur recovery processes.

This post was last edited by sxtblo on 2010-8-3 at 19:54. It can be stripped using a stripping tower, or it can be washed with boiler feed water in a washing tower before being sent to the wastewater treatment unit, as the condensate is somewhat corrosive.

We also use a stripping tower here; the gas produced is sent to a thermal flare. Sulfur recovery really isn’t an option

Okay, thank you all! I already know the general direction! Thank you all again!

In our plant, it goes to the flare; due to the relatively low pressure, it travels through a separate pipe to the flare

Stirrer tower: Liquid degassing, Gas desulfurization and recovery for combustion

Let me also explain this: The gas at the top of the stripping tower in our plant passes through two heat exchangers to be cooled before entering the gas-liquid separator; its temperature is usually around 60°. The gas from the top of the separator is sent directly to an acidic flare for combustion, while the liquid condensate at the bottom of the separator is pumped away. There are two routes designed for this liquid – one leads to the wastewater treatment system and the other to the coal grinding water tank. The route to the wastewater treatment system can no longer be used, as the bacteria present there are unable to handle this liquid with such high ammonia levels (the ammonia content is approximately 7000 mg/l); all the bacteria die in such conditions. It can only be sent to the coal grinding water tank, but there is a more serious problem: once it reaches the coal grinding water tank, and due to our design, the filtrate from the vacuum filter also goes there. With these two streams of water entering the tank, severe scaling occurs on the impellers of the coal grinding pumps, and the inner walls of the pipes are also covered in scale. This severely affects the amount of water available for coal grinding, and replenishing water for the entire coal grinding system has become a major problem. I would like to ask if your factory has encountered such a situation! Gasification process package from Northwest Chemical Research Institute, 6.5 MPa

If it is not sent to the torch, the ammonia contained in it can be recovered and turned into ammonia water for use. I just prepared a process package for ammonia recovery at a gasification plant in Inner Mongolia; the ammonia solution is used for flue gas desulfurization and denitration.