What are the difficulties in providing a standby unit for high-pressure coal slurry pumps used in water-coal slurry gasifiers?
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It is understood that high-pressure slurry pumps used in coal slurry gasifiers do not come equipped with backup units; in most cases, there is one pump per gasifier. Thus, if one of the slurry pumps fails, it is necessary to start the pump from another gasifier. What are the difficulties associated with not having backup units for these high-pressure slurry pumps? Has there been any breakthrough?
If switchover of the backup unit needs to be considered, current high-pressure slurry pumps are all piston pumps, and achieving a disturbance-free switchover poses a challenge. Moreover, the pump can be repaired during the switchover of the vaporization furnace, and it generally won’t have any problems for one cycle after the repair.
Our factory also uses one furnace and one machine per unit; in my opinion, the cost efficiency of having spare machines and the safety associated with switching pipelines are the main reasons for this approach
Starting high-voltage motors is a problem; pipeline switching and flow meter interlocks are also problems
Gasification furnaces have very high requirements regarding the process parameters. Water-coal slurry pumps are usually matched one-to-one with the gasification furnaces, and the process conditions may change during pump replacement; therefore, no such pumps are installed.