Luchi furnace pressurization

Luchi pressurization method: 1. Use syngas from the cooled outlet for pressurization; the gasifier carries out secondary pressurization, and there is no need for coal lock gas compression. The pressure-relief gas from the coal lock is collected in a gas holder and then reused (depending on whether it can be utilized)； 2. After the pressure in the coal lock gas is released, it is collected in the gas holder and then compressed by a coal lock gas compressor for reuse in pressurization; multiple pressurizations are not required, and the excess gas can be sent as feed gas to the shift reactor inlet (a complete set of coal lock gas compression systems is necessary) ； 3. Pressurization is achieved using purified carbon dioxide, with no need for recovery (designed to prevent phenomena such as carbon dioxide liquefaction and frosting based on pressure levels) ； Each of the three pressure-charging methods has its own advantages and disadvantages, but in all cases the exhaust gases must be treated to meet the required standards before they can be released (in accordance with environmental regulations). The first method is the traditional Lurgi process design, while the latter two are designs developed in recent years ； If it is the ammonia synthesis process, nitrogen pressurization can be considered ；

In what specific applications is carbon dioxide pressurization used?

I’m not quite sure what working conditions you’re referring to The decision is made based on the requirements of the end product: for example, in the case of coal-to-natural gas production using the Lurgi process, carbon dioxide can be used instead of nitrogen, as the end product requires a limited level of nitrogen content; nitrogen cannot be reduced to that limit through low-temperature methanol washing, whereas carbon dioxide can be removed through this process. It is determined based on the design system pressure rating: for example, carbon dioxide liquefies at a certain pressure level, and it is impossible to compress it beyond that critical pressure. It ultimately depends on the owner, after comparing the design, investment, and operation costs with traditional operating costs and environmental protection expenses.