Furnace wall graphite using combustion method
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The combustion method is to introduce air or other combustion accelerants into the carbonization chamber, causing the graphite to undergo a combustion reaction in the carbonization chamber, burning the graphite, and achieving the purpose of removing the graphite. There are many implementations of the combustion method. There are natural ventilation graphite burning method and forced ventilation graphite burning method. Installing an air nozzle on the head of the coke pushing rod or burning an empty furnace are both combustion methods. It is worth mentioning that various coking companies have different opinions on the time and method of burning an empty furnace. Some believe that it is best not to burn an empty furnace for more than 15 minutes to avoid causing new damage to the furnace wall. ； Some can be burned for a coking cycle without any bad conditions on the furnace wall. There are also different opinions on whether to open the furnace cover and riser pipe and whether to open the furnace door when burning an empty furnace. Generally speaking, the furnace wall is made of silica bricks. Opening the furnace cover and riser tube or opening the furnace door to burn graphite is ultimately unfavorable to the silica bricks with poor resistance to rapid cooling and rapid heat. It will also burn away the protective graphite in the brick joints, which is not conducive to the tightness of the carbonization chamber. Moreover, the growth of graphite on the furnace wall is uneven. Some parts are more, and some parts are almost non-existent. It takes a long time to burn out the furnace. This must also be taken into consideration when making sure, otherwise some graphite has not been burned much, and gaps have appeared in the parts without graphite. Therefore, we believe that using the method of emptying the furnace to remove graphite depends on the growth of the graphite on the furnace wall. According to the specific situation, consider whether to open the furnace cover, furnace door or riser tube, and determine the length of time for burning the empty furnace so as not to cause damage to the furnace wall. When the requirements for coke output are high, the operating rate must be high, the standard temperature will also increase accordingly, and the graphite accumulated in the carbonization chamber will also increase accordingly. Removing graphite by burning the empty furnace will prolong the furnace time, and will also have a certain impact on the output and heating system.
Nowadays, the coke pushing rod of the 6m coke oven coke pushing truck is equipped with a compressed air graphite burning device, which is cleaned during the coke pushing process.
Ours is a 6-meter coke oven and we don’t have this device. Can this brother please introduce it in detail? !
Install a compressed air pipe on the head of the focus pusher rod and connect it to the tail of the focus pusher rod. The compressed air at the tail is a rubber tube, which is easy to coil around the disc. The compressed air comes from the air compressor on the coke pushing car. The mechanical part of this device is not complicated, and the control method can be a travel switch type, or it can be controlled by setting the focus push time.
The method of burning an empty furnace to remove graphite is very effective, but it will cause damage to the furnace body, such as leakage on the upper part of the wall.
Our method of cleaning graphite is to add a scraper to the focus pushing rod. However, since the switch to tamping coke, there is basically no graphite left.
I personally think that cleaning graphite in this way will cause too much damage to the furnace wall. You can use a push rod and a scraper or manual cleaning to clean the graphite.
Such a device should be fixed on the focus pushing rod. Will the hose and long-term high temperature cause mechanical accidents and affect the focus pushing coefficient? (We don't have one with 6M either. Let me ask.)
The method of cleaning the graphite inside the riser tube with a cleaning spike hammer installed on the coal loading car and the method of cleaning the graphite in the furnace top space with a graphite scraper installed on the head of the coke pusher rod are mechanical cleaning methods. The method of mechanically removing graphite from the rising pipe, coal inlet and furnace roof space is inefficient and is not conducive to the protection of refractory materials and coke oven equipment. The structure of the graphite scraper is an extrusion operation rather than a shear operation, and does not consider the properties and operating conditions of graphite. And sometimes the method of scraping off graphite may cause unexpected damage to the furnace wall and bring disadvantages to production.
When tamping and coking, do not scrape off the graphite at the bottom of the carbonization chamber and the first layer of bricks. Otherwise, the wear on these parts will be aggravated, and in severe cases, the furnace bricks will be damaged and cause leakage.
In addition to the above-mentioned method of burning an empty furnace with natural ventilation, there is also a forced ventilation combustion method to remove graphite. Installing a compressed air nozzle on the head of the coke pushing rod, and introducing air into the carbonization chamber to burn the graphite during the coke pushing process is a method adopted by many coking companies. While burning the graphite on the top of the furnace, the compressed air ejected from the nozzle also blows up the dust during the coke pushing process and falls into the coke side, which increases environmental pollution and is detrimental to environmental protection. In order to avoid this drawback, Russian coking companies modified the nozzles and used the injected compressed air to form negative pressure, which absorbs the smoke and dust generated during the coke pushing process, and can strengthen the combustion of graphite. Depending on the particle size of the graphite, the graphite will be burned or the graphite will naturally fall to the bottom of the carbonization chamber, without causing pollution to the external environment.