Some questions regarding the slurry tank agitator
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I have a question for the experts: In coal chemical enterprises, are the slurry tank agitators used nowadays mostly imported or domestically produced? Are there high technical requirements for such agitators? How many mixers are needed for a coal slurry tank? How many slurry tanks are used in a medium to large-scale project? The question is quite amateurish; I’m sorry to embarrass the experts!
At present, mixers can basically be manufactured domestically, and the requirements for them are not very high; the main requirement is that the impeller blades should not be too long, as they are prone to breaking if they are too long. There is one mixer per coal slurry tank. As for the number of coal slurry tanks, there are few limitations since they are operated at atmospheric pressure; the main consideration is the size of the impeller blades, as long as they can effectively stir the slurry. The diameter of the coal slurry tank is determined by the size of the impeller blades
It seems that nowadays they are mostly imported, especially those using GE Texaco technology; they are generally brought in from abroad
The mixers produced by French company Robin have excellent performance
Domestically produced products are more than sufficient; China’s manufacturing industry has improved greatly compared to the past
The agitators for coal slurry tanks are currently mostly imported; their technical complexity is not high. The main issue is stability of operation, and there is a high demand for wear resistance in the blades. At present, a layer of rubber is applied to the blades, but even so, wear on those blades remains significant. I don’t think there is a strict requirement regarding the exact number of slurry tanks; it can be determined based on the capacity of these tanks and the load of the gasifier. I believe it’s sufficient to have a reserve of 8 hours to ensure that the gasifier can continue operating normally in case one of the grinders fails.
For Huisheng Phase 1, GE recommended the use of two slurry tanks; later, Huisheng decided to use one large tank, and it seems that this approach has worked well. Therefore, this configuration is quite flexible.
Domestic ones work! The size depends on the dimensions of the slurry tank
It is recommended to use imported ones for the large coal slurry tank, while domestic ones should be used for the small coal slurry tank at the outlet of the coal grinder
It depends on the size; smaller domestic ones are definitely fine. It’s still more reliable to import large coal slurry tanks, as coal slurry is a highly viscous and compressible fluid; the calculations related to its flow are quite complex, and improper calculations can easily lead to problems with the mixing paddles. Both Robin Company and Lening Company are good.
Our slurry tank mixer features twin blades. The diameter of the tank is 8200, and its height is 10000. The material used is CS or CS+ with a chromium carbide coating. The blade design is the Lightning patented Impeller. The output rotation speed is 38 r/min. The manufacturer is Laining Mixing Equipment
The selection of an agitator depends mainly on the size and height of the slurry tank, as well as the concentration of the slurry. Without agitation, sedimentation and stratification occur, which can lead to blockages at the outlet. The length of the agitator blades is generally half the radius of the tank; depending on the height of the tank, several layers of blades can be used. During operation, it is necessary to prevent the mixer from stopping, as such a stoppage could result in the mixer being unable to start again.