What are the reasons for backfire during the heating-up of a gasifier?
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High liquid level in the quench chamber, large volume of fuel gas, steam pressure fluctuations leading to water inclusion or steam interruption, low vacuum resulting in leaks in the extraction pipelines, blockage at the slag outlet of the vaporization furnace (due to poor slag removal during shutdown), the vaporization furnace not being fully sealed, high liquid level in the wash tower causing a water seal to form in the extraction pipelines – there are other issues as well; please add more details.
There are also issues with the extractor, as well as a blockage in the drainage pipeline of the separation tank behind the extractor, which results in a cut-off of the extraction steam.
Everyone else agrees, but I disagree with Article 6. We have just started heating the furnace; so what’s the point of blocking the slag outlet? I think, for one reason, the furnace has insufficient negative pressure – and that’s it.
When parking, the slag is poor or there is no slag. When raising the temperature to the high-temperature range again, be sure to do it slowly; otherwise, slag will block the slag outlet, leading to tempering.
It is mainly caused by a positive pressure being generated inside the furnace
Open the two valves of the lockhopper and the vaporizer when the liquid level in the lockhopper is empty