Production method and production system of high-stability coal water slurry fuel

Abstract

The invention provides a production method and production system of high-stability coal water slurry fuel, and belongs to the technical field of coal water slurry production. A coal water slurry product produced by the production method has better particle size gradation and better stability and fluidity. The production method comprises the following steps: determining the total amount of a dispersant and the total amount of a stabilizer; adding all feed coal, water, part of the dispersant and part of the stabilizer into a mill from the inlet end of the mill for grinding; adding the residual dispersant into slurry flowing out of the outlet end of the mill from the outlet end of the mill to obtain primary slurry; collecting the primary slurry, performing stirring, performing refined filtration, and conveying the product into a stirring tank; adding the residual stabilizer into the stirring tank, and uniformly mixing the residual stabilizer and the slurry in the stirring tank under stirring to obtain secondary slurry; and conveying the secondary slurry to a homogenizing tank for homogenizing and curing, and conveying finished-product slurry into a finished-product slurry storage tankfrom the bottom of the finished-product slurry storage tank for storage.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry production, and in particular relates to a production method of high-stability coal-water slurry fuel and a production system thereof. Background technique [0002] Coal water slurry fuel is a fluid with a certain particle size distribution and good rheological properties processed by coal, water and a small amount of additives. The quality of coal water slurry is mainly affected by coal quality, additive type and dosage, and coal powder particle size distribution. and grinding method (dry and wet grinding). Among them, the type and amount of additives are determined according to the coal quality, and the particle size distribution of coal powder is affected by the grinding method, the type of the mill and the number of bins of the mill. Therefore, when the coal quality, additive type, grinding method and mill type are determined, what really affects the quality of coal-water slurry is ...

AI Technical Summary

Problems solved by technology

However, the dosage of the dispersant is determined according to the coal slurry test. From the analysis of the mechanism of the dispersant, it can be known that the one-time addition of the dispersant will obviously reduce the viscosity of the coal-water mixture and increase the fluidity. Mechanism analysis shows that this will increase the chance of collision, reduce the chance of grinding, reduce the chance of obtaining the best particle size distribution, and then affect the stability of CWS

Adding a stabilizer to the strong stirring tank is actually a remedy for the stability of the coal water slurry. The function of the stabilizer is to make the coal water slurry more inclined to transform into a thixotrope, thereby improving the stability of the coal water slurry. However, the added stabilizer cannot fundamentally solve the problem that the coal-water slurry is easy to settle. After the coal-water slurry is stored in the finished slurry storage tank for a long time, there will still be serious sedimentation. In the case of a stirring device, the amount of sedimentation is still relatively large, and the tank needs to be cleaned frequently

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