What is the difference between Ruchi furnace coal gasification under pressure and pulverized coal gasification under pressure?

Are you asking about the difference between pressure gasification in a Ruhr furnace and coal slurry gasification, or are you asking about the difference between pressure gasification in a Ruhr furnace and pressure gasification using dry coal powder? Whether it is pressurized gasification of water-coal slurry or pressurized gasification of dry coal powder, both fall under the category of fluidized-bed gasification technologies; whereas pressurized gasification of crushed coal in the Ruhr process is a fixed-bed pressurized gasification technology. There is an essential difference between these two planning techniques. But overall, if you have experience with fluidized-bed gasification, then there are not many issues when working with fixed-bed pressurized gasification. In terms of operational difficulty, process complexity, and the challenges associated with the control system, fixed-bed and fluidized-bed systems are not on the same level. However, fixed-bed reactors also have their advantages, which include: a short construction period and low initial investment, as well as a short recovery time ； There are no strict requirements regarding the ash fusion point of coal types; in fact, a higher ash fusion point is preferable, allowing for a wider range of coal options to be chosen ； Start-up and shutdown operations are simple and fast ； Gas has a high methane content, making it suitable for city gas and coal-to-natural gas production. Its disadvantages are also numerous: the higher the pressure in fixed-bed gasification, the lower the content of useful gases, with higher levels of methane and carbon dioxide. At 4.0 MPa, the CO2 content can exceed 25%, while the content of useful gases is below 70%. When bituminous coal is used, the methane content is around 8%–10%; whereas with anthracite, it can be above 10% ； The furnace is equipped with rotating equipment, which means that the continuous operating cycle for a single furnace is not very long, and thus there is a large amount of work required for maintenance and repair ； The pressurized gasification process using the Ruhr process consumes a large amount of steam. Moreover, as the pressure increases, the rate of steam decomposition decreases; at a pressure of 40 kilograms, the steam decomposition rate is below 40%, which means that the gas contains a large amount of unreacted water vapor. Since the pressurized gasification technology based on the Ruhr process employs a quenching process, a large amount of water condenses in the gas, resulting in high wastewater generation. An independent circulating water system is necessary to enable the recycling of this wastewater. Dalian Jinzhongdingxin Technology utilizes a waste boiler process along with modern water treatment systems, thereby successfully addressing the issues related to steam consumption and water management in the Ruhr process ； In fixed-bed pressurized gasification, when bituminous coal is used as the feedstock, large amounts of organic substances such as tar and phenol are produced, which results in very high costs for water treatment ； Although the gas generation capacity of fixed-bed gasification is greatly improved after pressurization, it is still far inferior to that of fluidized-bed gasification. As for the advantages and disadvantages of fluidized bed reactors, the original poster has previous experience working with water-coal slurry, so they are likely familiar with them; therefore, no further discussion is needed here

The Ruchi furnace is a pressurized gasification furnace for coal particles equipped with a jacket; it uses a coal feeder located above the furnace to add coal particles into the furnace chamber one after another. After the coal in the furnace chamber burns, the furnace gas is extracted, while the slag is discharged into the ash lock through the gaps in the lower grate. The manufacturing requirements for this type of furnace are much simpler compared to those of water-coal slurry gasification furnaces. Without water wall cooling, the furnace chamber is cooled by the circulating water in the external jacket.

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This post was last edited by IAmABadBoy on 2017-4-8 at 11:09