[Participate in the activity] Differences in the exhaust gas composition of carbonation towers in air-based soda ash production and concentrated-air soda ash production

The combined alkali production process consists of ammonia conversion alkali production and concentrated gas alkali production; the CO2 content in the ammonia conversion gas is around 26%, not reaching 30%. The exhaust gases from ammonia conversion alkali production are required to have a CO2 level of less than 0.2% (as a means of decarburization), and these gases are then sent back to the ammonia synthesis system.

This post was last edited by Qingtan Xiaolong on 2010-4-12 at 20:22. Thank you for your help; I made a basic mistake! Replying via phone – I can’t give you any money right now, but I’ll make it up to you later, hehe…

The main difference between the ammonia-soda process using shifted gas and that using concentrated gas lies in the following: in the process using shifted gas, the gas obtained after the shift reaction in ammonia synthesis (containing about 25–30% CO2) is fed into the carbonation tower of the ammonia-soda process. All of the carbonation exhaust gas is recovered and reused in ammonia synthesis. As part of the decarburization step in ammonia synthesis, it is required that the CO2 content in the exhaust gas at the outlet be less than 0.2%. In the process using concentrated gas, high-concentration CO2 gas from the ammonia synthesis decarburization step is pressurized using a concentrated gas compressor and then fed into the carbonation tower for reaction. After the carbonation exhaust gas has had its ammonia recovered through washing, it is essentially released directly, with the CO2 content at the exhaust gas outlet being controlled at around 2–4%.