What causes the sudden increase in the total hardness of the ash water from space furnaces?
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In the 4MPa space furnace, the total hardness of the graywater system is consistently kept below 1100 ppm, ensuring high system stability. Recently, the total hardness has suddenly risen to 1500 ppm, while the other values remain essentially unchanged. The water quality for replenishment, the amount of wastewater discharged, the system operation load, and the ash content in coal powder remain stable, with no significant fluctuations. Some say there is a cooling water leak, but only the total hardness increases while other parameters remain unchanged (such as chlorides), which is really puzzling. I would like to ask everyone: apart from water addition and fly ash, are there any other sources of total hardness? Does anyone have relevant experience? I hope everyone can help, thank you!
Your coal type has changed; you need to take everything into consideration – not just the water quality. Look at your coal type, additives, flocculants, as well as the process conditions, and so on. . . . . . . . . . . . .
It can be considered from the following aspects: 1. Whether there has been a change in the coal quality, with an increase in the content of calcium and magnesium in the coal ash； 2. Is it due to an increased amount of flux used? 3. There may be errors in the analytical tests; for example, a high iron content in the water can often affect the determination of the hardness threshold.
The focus should still be on searching by source: 1. Coal quality. In some areas, the coal quality is of the “pocket type” – the core part is normal coal, while the surrounding areas contain coal of lower quality with higher dust content. This situation requires multiple analyses; a coal sample cannot be determined based on the results of a single analysis. 2. Water intake: Other sources that may affect the calcium and magnesium ion levels in the system’s make-up water include fresh water and the recirculation water system. It is necessary to check whether there are any increases or leaks in the fresh water supply and the reclaimed water system of the system; it is not necessary to check the burner cooling water system and the drum system, as the water quality in these systems is already excellent.