What kind of pump is suitable for transporting water-coal slurry?
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Our facility has 3 self-owned boilers, which are primarily used for supplying steam throughout the plant and for power generation. Currently, the fuel for boilers is mainly water-coal slurry, which is transported using a single-screw pump. In actual use, screw pumps suffer from frequent failures (mainly insufficient flow and unstable flow), requiring the pump casing and rotor to be replaced approximately every 3 months. It causes difficulties in equipment management and increases costs. Experts, are there any pump types with higher reliability, or are there new modification methods that can improve the stability of slurry pumps? What about the continuous operation time? I’m begging for some advice
What is a rotor? Is it a screw?
You can try using a slurry pump, equipped with an external flushing mechanical seal
Currently, screw pumps are used across the country to transport water-coal slurry. Because in the previous process, the ball mill uses countless steel balls to grind coal into powder, which is then mixed with water to form a slurry. Therefore, the slurry contains hard particles such as iron powder and small iron pieces, which is one of the main reasons why it is difficult to replace it with other pumps. Another characteristic of water-coal slurry is that it dries out, becoming harder over time. If pump A replaces pump B and pump A is under maintenance for 3–7 days, the residual slurry inside will have long since dried up, turning into a harder substance (like hard mud) that sticks to the interior of the pump chamber. If it’s the impeller, it may get stuck, and it needs to be cleaned thoroughly. Given these two main characteristics, screw pumps are currently used in domestic power stations and boilers that utilize water-coal slurry. It belongs to the category of equipment that requires periodic replacement; the stator and rotor wear down every day, and as the gaps increase, the performance can no longer meet requirements. Generally, it takes 3 to 6 months before replacement is needed, and the grating plates and linings in ball mills usually also need to be replaced before half a year is up
A screw pump is selected to transport water-coal slurry
A screw pump is selected to transport water-coal slurry
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