Gasification Daily Question: 11-15-2016 – Process analysis question (5 points for participation, 10 points for a correct answer)
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This post was last edited by tfx511024 on 2016-11-17 at 10:18. On 2016-11-15, there were process analysis questions (5 points for participation, 10 points for correct answers). Analysis question: Reasons for the high temperature in the water-coal slurry gasification furnace: (at least four reasons)
1. Low slurry concentration 2. High oxygen flow rate 3. Single cylinder of the high-pressure slurry pump does not deliver flow 4. Leakage in the slurry pipeline
1. Excessive oxygen volume 2. Decreased slurry concentration 3. Low slurry flow rate (1) Leakage in the slurry pipeline (2) Issues with high-pressure slurry) 4. Clogged slag outlet
Low slurry concentration, increased oxygen purity, high oxygen-to-coal ratio, low carbon content in the feed coal, high ash melting point of the coal, blockage at the slag outlet (leading to increased temperature and melting of the slag), malfunctioning check valves at the inlet and outlet of the slurry pump resulting in unstable flow, excessive oxygen causing high temperatures, uneven fuel injection from the nozzles leading to locally high temperatures, and increased load
1. Changes in coal quality, with an increase in calorific value； 2. Increased oxygen level ； 3. The concentration of water-coal slurry decreases ； 4. Variations in production load. The above are my personal opinions; please ask the moderator for corrections.
Tests: 1. Excessive oxygen level; 2. Decreased slurry concentration; 3. Low slurry flow rate (1) Leakage in the slurry pipeline; (2) Issues with high-pressure slurry; 4. Clogged slag outlet
1 Low coal slurry flow rate 2 High oxygen level 3 High oxygen-to-coal ratio 4 Low coal slurry concentration
1. The furnace temperature is set too high； 2. Ash accumulation is severe at the support plates, preventing heat from dissipating promptly ； 3. The furnace bricks on the shelf have been thinned. 4. Adjustments are not made in a timely manner.
It’s a bit difficult; I’m trying to learn it. When will it be available?**
The slurry flow rate is low, the oxygen flow rate is high, resulting in a high oxygen-to-coal ratio; the slurry concentration is low. After adjustments to the production load, the decrease in slurry flow rate is minimal, which leads to a high oxygen-to-coal ratio