Cleaning of coke oven graphite
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The graphite in coke ovens is growing too rapidly; how can it be controlled effectively, and on which aspects should focus be placed? If there are any good methods, please share them. Thank you
Height of coal cake, temperature in the furnace top space~~~
1. Control the height of the coal cake. 2. Install a scraper above the coke pusher rod.
Cleaning methods: 1. Blowing in compressed air; 2. Mechanical methods, such as installing scrapers or similar devices on top of the coke pushing rod; 3. Burning out the furnace. Each method has its advantages and disadvantages, making it difficult to determine which one is superior. The root cause of excessive graphite growth is the high temperature in the furnace roof area; improvements should be made by controlling the height of the coal cake, optimizing the firing operations, and enforcing strict operating procedures – relying solely on cleaning is not sufficient.
1. Control the height of the coal cake to ensure sufficient space at the top of the furnace. 2. The temperature in the space at the top of the furnace should not be too high. 3. Half an hour to one hour before each discharge, open the rising pipe and the coal feeding holes on the coke side to burn graphite
The people upstairs are right; I would like to add a few points: The high pressure in the gas collection ducts results in the raw coal gas staying in the carbonization chamber for a relatively long time, which leads to the decomposition and formation of graphite； The standard temperature is too high. Cleaning method: It is recommended to run the furnace empty for three small cycles first, and then remove the graphite, which makes it easier to remove. It is not recommended to use compressed air for purging, as this will shorten the lifespan of the furnace.
One reason for high collector gas pressure. At the beginning of operations, we temporarily set the gas collection pipe pressure 20 Pa higher than the normal value, in order to facilitate the rapid growth of graphite in the new furnace wall. Later, after graphite was formed, it created a seal for the furnace wall. It then returned to normal. Last year, reduced production by steel companies led to difficulties in selling coke. The coking time was once extended to 48 hours, when the furnace wall was clean. As the coking time continues to shorten to 20 hours, graphite production increases rapidly, and this has now had a significant impact on the extraction of raw gas as well as coke pushing. Thank you all for your advice.
Everyone has made good points, but the problem should be addressed at its root. By establishing reasonable operating procedures for the coke ovens and maintaining an appropriate pressure range in the gas collection channels, the formation of graphite inside the carbonization chambers can be basically eliminated. For questions regarding the pressure control of coke oven gas collection ducts, feel free to contact me! sdstgmzg@163.com; Please, some kind person, help me by adding some wealth points – I only have a little, it’s really sad!
Everyone has been very specific in their explanations. There is another situation: if the coke oven has dual gas collection pipes, it is necessary to maintain pressure balance between these pipes; otherwise, backflow of raw gas and ammonia water can occur, which can also lead to the formation of graphite in the carbonization chamber.
There was a previous article on the same topic; study it carefully and verify it through practice