Analysis of the reasons for high chloride ion content in the ash water system of the gasification furnace
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For the long-term operation of water-coal slurry gasification, the control of water system parameters is a crucial aspect. Analysis of the reasons for high chloride ion content in the ash water system of the gasifier?
Pay attention to coal, and pay attention to additives
There are relevant papers available online; it has been mentioned that additives such as dust suppressants and antifreeze are used during the transportation of raw coal, and these can all increase the chloride ion content
Analysis of the high chloride content in the gasification ash water system: 1. The chloride content in the coal used as raw material for gasification is crucial; 2. Dust suppression water used during coal mining, or antifreeze agents sprayed in winter to prevent freezing (which contain high levels of chlorides)； 3. For the transportation of raw coal by sea, dust suppression measures involving water spraying should be employed during loading and unloading at ports and docks; the use of seawater is prohibited ； 4. Pay attention to the quality of water used for coal grinding and slurry preparation in the equipment, and strictly control the amount of low-pressure ash water used ； 5. Chloride content in water-coal slurry additives. 6. Strictly control the quality of water used for replenishing the gasification system, and try to avoid using fresh water containing chloride ions directly ； 7. During normal operation, to maintain the salt balance in the gasification ash water system, it is necessary to carry out appropriate wastewater discharge in order to ensure an appropriate ash water concentration ratio. A too high concentration ratio can also lead to high chloride levels.
Which types of additives are of primary concern?