Ignition issues in the inert gas furnace of the coal grinding system
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Our plant uses SHELL gasification technology; there are many problems with gasification, and there are even more issues with coal grinding. Currently, our plant’s coal grinding inert gas furnace ignition guns are experiencing many problems with ignition, and the success rate of ignition is low. I’m wondering which type of ignition gun is used by similar companies How is it working? How long can it last? I hope everyone can exchange ideas. Let me first talk about my own situation: My factory uses products from Tianjin Xieli, and they have a high failure rate. Simultaneous ignition also does not succeed frequently; in other words, the process often requires manual ignition.
The question is indeed very good and innovative; those who understand it could please explain in detail, including the structural aspects.
Is there no one in the same field who is willing to exchange ideas?
Shell’s gasification process has distinct characteristics: the calorific value of the fuel gas is low, and a higher ignition energy is required. Therefore, it is a sound approach to use high-power flame-type igniters. The key is to have a thorough understanding of the performance of the flame injector before ignition, such as: the operating pressure of the flame-type ignitor ； The air supply pressure, as well as the ratio of fuel to combustion air – if any of these ignition conditions are not met, it will result in a difficult ignition process. The FIRE-50 flame-type igniter has an ignition power of 150 KW, but precise adjustment of the gas supply and air supply valves for the igniter is required during ignition. Using only shut-off valves on site makes it impossible to achieve such precise adjustments; it is recommended to install a high-capacity filter and pressure reducing valve assembly
If the calorific value of the gas is low, a single ignition gun is not sufficient for ignition; instead, a diesel ignition gun or a liquefied gas ignition gun must be used. Once the furnace temperature rises, the problem is resolved – in other words, a portable oil and gas ignition device should be added. If the calorific value of the gas is sufficient and there are no issues with the ignition gun, then proper air supply before ignition is very important. Since the temperature in the furnace is low before ignition, it is necessary to use a smaller amount of exhaust air and even less supply air; this helps to ensure a higher local heat load. Once the gas combustion becomes stable, the amounts of gas, air, and exhaust air can be increased gradually
If the calorific value of the gas is low, a single ignition gun is not sufficient for ignition; instead, a diesel ignition gun or a liquefied gas ignition gun must be used. Once the furnace temperature rises, the problem is resolved – in other words, a portable oil and gas ignition device should be added. If the calorific value of the gas is sufficient and there are no issues with the ignition gun, then proper air distribution before ignition is very important. Since the temperature in the furnace is low before ignition, it is necessary to use a smaller amount of exhaust air and even less supply air; this helps to maintain a higher local heat load. Once the gas combustion becomes stable, the amounts of gas, air, and exhaust air can be increased gradually. During operation, special care must be taken to prevent flashback, as the operations at this stage are generally carried out at the limit point for flashback
Adopt the newly developed flame ignition device from Tianjin Xieli Automation Engineering Company – it has an output power of 150 KW and features built-in optical flame detection, offering excellent performance for burners with low combustion values!
Renovation, continuous renovation. The amount of gas is too low (it’s not the pressure) – that’s the key issue. The distance of corona discharge is second. Finally, adjust the air volume by fixing the gas volume.
We use a product manufactured by a factory in Wuhan. During the initial testing phase, it was difficult to get ignition; however, by adjusting the furnace pressure, the initial air supply volume, and the amount of air at the intake opening, things have improved significantly. While it’s not 100% successful, we can be confident that it works in over 90% of cases
Hello, it might be that you didn’t select the right setting when activating the liquefied gas. Adjust the pressure of the liquefied gas to normal levels using a pressure regulator, maintain an appropriate amount of circulating air, and then activate the liquefied gas while increasing the negative pressure – this will bring you much closer to success