Exchange operations related to coke ovens

You can set the interval according to your actual needs; in particular, after turning off the gas, the interval between replacing the exhaust gases must not be too short.

However, I asked the relevant people, and they said it doesn’t exceed one minute in total, around 50 seconds. Is this time correct?

Typically, automatic switching is set as follows: cut off the gas for 15 seconds, pause for 0.8 seconds, then switch the exhaust gas for 15 seconds, pause for 0.8 seconds, and finally supply gas for 15 seconds – a total of 46.6 seconds. The first pause is to allow the remaining gas after the gas supply is cut off to burn completely, while the second pause is to fill the combustion system with air.

Yes, as long as the interval between turning off the gas is not too short. Our factory is around the same time as yours. Each stove is different.

Hello, could you take a look at my question: it concerns the process of exchange in coke ovens. http://bbs.hcbbs.com/thread-1595683-1-1.html It’s entirely related to exchange, and I can’t quite figure out the reason myself. . .

Coke ovens using different carbon removal processes have slightly different reversing designs, but all follow the principle of shutting off gas—exchanging with exhaust air—then turning on the gas again. 1 In domestic plants, most coke ovens use a natural carbon removal process, which involves using the carbon removal holes on the gas valves to draw in air during the switching period in order to remove any remaining gas from the combustion system. The switching times are either 46 seconds or 46.6 seconds; generally, the gas supply is shut off for 15 seconds, followed by a pause of 0.5 seconds (0.8 seconds), after which waste gas is allowed to flow for 15 seconds, with another pause of 0.54 seconds (0.8 seconds) ； Turn on gas for 15 seconds. The original design called for 4.3 meters ； Some 6-meter coke ovens use a switching time of 46.6 seconds; the newly designed 6.25-meter rammed coke ovens, as well as 5.5-meter rammed coke ovens, also employ a switching time of 46 seconds ； 2 Foreign-designed coke ovens, such as the 7.63-meter coke oven, employ a forced carbon removal process, and their heating system models also differ from those of domestically designed ovens; instead of providing a constant heat supply, the heating is adjusted according to the coal loading situation. Standard temperature, gas calorific value, target coking time, raw gas temperature, etc.; intermittent heating, with the exchange process being: turn off the gas——pause for 15 seconds (for carbon removal)——exchange with exhaust gas——pause for 15 seconds——turn on the gas. The second 15-second period is adjustable, and it is adjusted according to the actual temperature and the deviation from the target temperature.