Weekly Topic: How to remove sulfur from high-sulfur gas
Thread Content
With coal resources becoming increasingly scarce and prices rising, how nitrogen fertilizer manufacturers can use high-sulfur coal to reduce production costs is an urgent issue that every such company must address. So what processing methods and desulfurizing agents should be used? Please share your opinions on how to reduce the hydrogen sulfide content in semi-water gas, which is at 3–5 g/m³, to meet the specified limits.
This post was last edited by Chemical Gas Purification on 2010-11-14 09:09. Hello, Moderator Yan: Our new technology for pre-desulfurization of pipelines in front of the towers delivers an effect equivalent to that of two towers in operation, but with the operating cost of just one tower. It can solve the problem of high-sulfur coal, requires low investment, and simplifies the modification of existing plants. The catalyst used is an SDS high-efficiency desulfurization catalyst from the cobalt phthalocyanine series, with soda ash as the base source.
Reply to 2# Chemical Gas Purification: The moderator can introduce your technologies here for other users to learn from and share.
This post was last edited by 654262293 on 2010-11-14 at 11:04. The method we use is two-stage tower desulfurization: the H2S concentration at the inlet of the first stage tower is around 4000 mg/m3, while it is 300–500 mg/m3 at the outlet; the H2S concentration at the outlet of the second stage tower is below 10 mg/m3. KCA+888 desulfurization is used, with Na2CO3 as the alkali source
Based on the existing setup, calculations are used to determine the size of the pipe reactor required; this reactor is equipped with a special gas-liquid distributor to ensure thorough mixing of gas and liquid, thereby achieving efficient desulfurization. Due to its special design, the sulfur capacity here is particularly high, allowing it to absorb a large amount of hydrogen sulfide, thereby solving the problem associated with the newly installed pre-desulfurization tower. As it is a tubular device, it requires little space, has low investment costs, and is easy to modify – usually minor repairs are sufficient. The tubular reactor can be prefabricated in advance and simply connected in place when needed. Since it is a pipe reactor, even a high spray density does not result in a large circulation volume; therefore, the operating costs do not increase significantly, being comparable to the costs of tower operation.
This post was last edited by 654262293 on 2010-11-18 at 11:17. Desulfurization and decarburization can be carried out simultaneously using low-temperature methanol washing, resulting in a high level of purification.
This post was last edited and replied to by Chemical Gas Purification on 2010-11-14 at 12:50. Reply to 4# chen-jun-1024: The method is good, but it takes up space and has high operating costs (high power consumption due to large circulation volume), so it’s not very economical.
Reply to 7# Chemical gas purification: Yes, those shortcomings you mentioned do exist, and we are indeed planning to make some modifications
Reply to 8# chen-jun-1024: Could you please send the relevant parameters so that we can prepare a plan for pre-desulfurization of the pipelines before the tower for your reference? Email: liutaoandzdy@sina.com； The main information required includes gas volume, gas composition, equipment specifications and models (including stationary and operating equipment as well as regeneration tanks and injectors), and liquid composition. I hope it can provide you with some reference and assistance.
Reply to 9# Chemical gas purification: Okay, I’ll send it to you once I’ve prepared the materials. Thank you in advance
Reply to 10# chen-jun-1024: Nowadays, in new large-scale coal chemical projects, processes such as coal-to-methanol production, coal-to-synthetic ammonia with co-production of urea, coal-to-oil production, and the purification of coal-to-natural gas all employ the low-temperature methanol washing process!