Gasification Daily Question: 2016-11-17 Process Analysis Question (5 points for participation, 10 points for a correct answer)

This post was last edited by tczxs on 2016-11-17 at 10:42: 1. Internal moisture of coal 2. Internal moisture of coal 3. Total moisture of coal 4. Degree of ash melting point

1. Moisture content in coal； 2. Particle size of coal ； 3. Addition of additives ； 4. Flux.

1. Add too much water； 2. Less coal added ； 3. High coal moisture content ； 4. Excessive amount of additives ； 5. Rinse water leaks in ； 6. Instrument failure ； 7. Analytical errors caused by high heating temperatures and coal decomposition ； 8. The grading issue of the steel bars results in an excessive amount of coarse particles, causing some coal to escape. . .

The main factors include coal quality, particle size, additives, and solubilizers

Poor coal quality, poor particle size distribution, excessive water, insufficient coal, high moisture content in the coal, additives

1. Deterioration of coal quality； 2. Excessive water injection volume ； 3. The particle size distribution of coal powder is uneven; select an appropriate particle size distribution ； 4. Excessive addition of additives ； 5. Factors such as the pulping process 6. Insufficient sense of responsibility among operators

The factors affecting the concentration of water-coal slurry mainly include coal quality characteristics, particle size distribution, and the types and proportions of additives. 1. Influence of coal type and its slurry-forming properties. The slurry-forming property of coal refers to the ease with which coal can be used to prepare water coal slurry. Pulpability is generally determined by the coal slurry prepared under normal temperature and shear rate. The influence of particle size distribution: In water-coal slurry, the coal powder not only needs to meet certain size requirements but also a specific particle size distribution. The particle size distribution should allow particles of different sizes to fill each other, thereby reducing the gaps between them and achieving a higher packing efficiency. With a high packing efficiency and few gaps between particles, the amount of water required can be reduced, making it easier to prepare high-concentration water-coal slurry. 3. Effect of additives: Water-coal slurry additives refer to a variety of chemical agents added to achieve high concentration, high stability, and good rheology in water-coal slurries; they mainly fall into two categories: dispersants and stabilizers. A dispersant is a surfactant whose function is to promote the uniform dispersion of coal powder particles in water. It can significantly reduce the surface tension of water, enhance the wettability of the coal powder particle surfaces, prevent the particles from agglomerating into clumps, and thus achieve a high packing efficiency, enabling the preparation of water-coal slurry at higher concentrations.

1. The moisture content of the coal type (surface moisture or internal moisture) increases； 2. The amount of coal fed into the mill decreases ； 3. The water volume entering the mill increases ； 4. Severe wear of the steel rod ； 5. There is a leak in the flushing water pipeline of the coal slurry pipeline ； 6. A change in coal type results in a deterioration of the grindability index