Analysis of the consequences of high pressure difference in the SGC superheating section of Shell powder gasifier?
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This forum contains analyses of the reasons for the high pressure difference in the SGC superheating section of Shell’s gasification furnace; let’s discuss it – what consequences can high pressure differences have on the system? How to deal with it?
If the pressure difference really becomes high, it indicates severe ash accumulation inside. With the load on the gasification furnace remaining unchanged, this means that the gas production volume stays the same; however, as the gas flow area decreases, the gas flow velocity necessarily increases. An increased gas flow velocity leads to intensified erosion of the water-cooled walls, resulting in greater wear, and the consequences can be severe. Therefore, when the pressure difference reaches the value that triggers shutdown, it is necessary to shut down the system immediately.
Could this affect the humidity of the circulating gas, leading to the accumulation of a large amount of scale in the compressor system (such as in the inlet pipes and impellers), thereby affecting the operation of the vaporizer? ?
If the pressure difference in the superheating section of the SGC increases, it will lead to an increase in the outlet temperature of the syngas, as well as increased wear on the inner walls. This results in finer ash particles being carried in the syngas exiting the SGC, along with an increase in their velocity. To reduce the pressure difference in the superheating section, it is necessary to increase the amount of quench gas or the amount of high-temperature, high-pressure N2 used for purging, which in turn increases the load on Unit 15. As a result, the service life of the ceramic filters is affected, and their filtering efficiency declines. This can lead to blockages in the quench gas compressor and the wet cleaning unit, and in severe cases, shutdown of the system may be required.
The people mentioned above have explained it quite clearly from a technical perspective! From the equipment perspective, if the pressure difference in the superheating section of SGC increases, it can also cause the superheating tubes in section E-1306 to break, and it may lead to misalignment of those superheating tubes as well! Therefore, during operation, it is essential to avoid excessive pressure differences, as this can create pressures within the process and also cause damage to the equipment ! ! :) :)