Disposal of contaminated methanol generated by Luchi low-temperature methanol washing technology
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Hello everyone. The syngas purification process in the facility where I am currently located uses the Ruichi low-temperature methanol washing technology. The methanol produced by this technology contains high concentrations of HCN and NH3 (with a design value of 10,000 ppm), along with about 3% water content. Moreover, the methanol obtained is black in color, which may be due to the presence of ferrous sulfide, coal tar, and other substances. Environmental protection companies are unwilling to accept contaminated methanol under these conditions, as using it as fuel in heating furnaces may lead to excessive levels of nitrogen oxides in the exhaust gases; the future disposal of such contaminated methanol is a concern. I would appreciate it if you could provide information on how your company handles contaminated methanol for my reference. Thank you. I also want to ask: the condensate resulting from the condensation of methanol vapor in this system turns yellow. Has anyone encountered this issue in their own installations, and do they know the reasons behind it as well as ways to resolve it? Thank you
Is the load on your ammonia scrubber meeting the required standards? The ferrous sulfide intermediate filter should be able to remove a large portion of it.
The load on the ammonia scrubber definitely hasn’t exceeded the limit; currently, the syngas is operating at only 50% of its capacity. The intermediate filter for ferrous sulfide is functioning properly – are you suspecting a problem with ferrous sulfide?
The load on the ammonia scrubber is stable; you can take samples to analyze the ammonia content in the exhaust gas from the ammonia scrubber. The designed level should be 3 PPM. If the ammonia scrubber is operating properly, no large amounts of ammonia should enter the system.
We are also from Luchi; we supply fresh and clean methanol here to feed the bacteria with wastewater
After hydrogenation of the sulfur recovery exhaust gases, does it go back to the low-methanol stream? If so, it means that sulfur particles are carried into the low-methanol system. On our end, the feed filter of the methanol-water separation tower is cleaned every day; however, after the exhaust gases are removed, it has never been cleaned again
I guess I should find a way to have the company use it as a co-fuel.
First, the amount of water used for washing in the ammonia scrubber should be increased to reduce the total amount of ammonia that enters methanol. Second, it is necessary to check whether the ammonia content in the raw gas from the upstream process is too high Is high-pressure nitrogen entering the gasifier causing a high ammonia content?