Do intermittent gas generators use CO2 and steam as gasifying agents?

A few years ago (around 2003), an organization proposed using carbon dioxide captured in industrial processes as a gasifying agent to replace oxygen in the production of gas for ammonia synthesis. However, there was no further progress on this idea; it seems that it’s not that simple, and there is still a long way to go before it can be put into practice. Let’s wait and see – hopefully, there will be innovations.

I wonder if that fellow sea enthusiast has information on this topic; please share it so everyone can learn from it!

This is the first time I’ve heard of using CO2 as a gasifying agent It’s really worth waiting to see; going to Haichuan today has truly broadened my horizons

In CO generation furnaces, the use of CO2 as a gasifying agent is commonly adopted; the reaction involved is: CO2 + C = 2CO. In ammonia synthesis systems, there was talk of using CO2 as a gasifying agent, and it is said that some manufacturers have indeed implemented this approach. But personally, I don’t think it holds much meaning. The reactions for producing H2 from CO2 are: CO2 + C = 2CO and CO + H2O = H2 + CO2. Combining these two reactions gives: C + 2H2O = 2H2 + CO2. Now consider the reactions for producing H2 using H2O as a vaporizing agent: C + H2O = H2 + CO and CO + H2O = H2 + CO2. Again, combining these two reactions yields: C + 2H2O = 2H2 + CO2. Without considering the conversion rate of CO2 to CO, the difference between the two methods of producing gas is that in the first method, both molecules of water are consumed during the conversion stage, while in the second method, one molecule of water is consumed per step, both for gas production and conversion. What’s the point of this?

If CO2 is used as the gasifying agent, how is the temperature inside the furnace maintained? Both are endothermic reactions; is external heating required?

It mainly depends on what products are produced. Generally, CO2 cannot be used in ammonia synthesis as it results in high consumption. For the production of monocarbon chemicals such as acetic acid, CO2 can be used as a gasifying agent.

The carbon dioxide gasification agent technology is a latest patented technology from the Dutch company Shell; it allows carbon dioxide gas to be used in coal gasification units as a substitute for nitrogen gas to serve as a gasification agent for transporting coal powder, offering advantages such as high efficiency and energy savings. Zhongyuan Dahua once implemented a set of carbon dioxide gasification agent technology in a methanol plant; it seems to have been the world’s first coal-to-methanol plant in which Shell’s gasifier was used together with carbon dioxide gasification agent technology for methanol production. As for the intermittent gasifier using carbon dioxide as a gasifying agent mentioned by the original poster, I have never heard of it.

The gas generator in acetic acid production plants uses CO2+O2 as the gasifying agent! ~! ~! ~! ~! ~!

Using CO2 as a gasifying agent is to produce CO

I heard that Sino-Singapore Chemical is planning to apply carbon dioxide gasification technology in methanol plants for aerospace furnaces. Specifically for intermittent gasifiers, I haven’t heard of any yet.