Commissioning torch

The flame that remains burning in the torch is an eternal flame; essentially, everything emitted by the torch is burned into non-toxic substances such as carbon dioxide and water, thereby preventing pollution and harm. As for why not use torches throughout the entire plant, it depends on the design of those torches: firstly, whether there are specialized burners for gasification, and secondly, whether the maximum heat radiation generated after combustion exceeds the design standards set by national regulations

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The emission levels are insufficient, or the emissions of combustion components do not comply with **the relevant standards!

Thank you for your guidance; I am eager to learn and expand my knowledge.

This post was last edited by pyp222 on 2017-4-26 at 15:02. There are also various types of flares, such as plant-wide flares, startup flares, and acidic gas flares. Some facilities combine the plant’s overall flare with the flare used for starting up operations; this is why some flares have three nozzles, while others have two, and there are even those with only one nozzle – in such cases, there isn’t even a nozzle for handling acidic gases. Generally, the startup flare is used for emissions during the commissioning phase of gasification units, while the plant-wide flare is used for emissions during the sequential commissioning of units such as shift reactors and purification units, as well as for the discharge of toxic and hazardous waste gases generated during operation. The acidic gas flare is used for discharging corrosive gas waste ； The emission characteristics of the three flares are different: the startup flare has high-temperature properties, while the acidic gas flare has corrosive properties; this determines the need for different materials for the flare piping. During normal operation, the start-up flare is not used; instead, the plant’s main flare is utilized continuously, as are the acidic gases. At this time, the amount of gas emitted is low, and the emissions are unstable. The gas alone is not sufficient for stable combustion, which is why permanent lights need to be installed at the flares – usually two or more of them. Liquefied gas or other fuels are used to assist in igniting these emitted gases. Although the startup torch does not operate during normal operation, it is possible that gas needs to be vented at any time. Lighting the torch only after venting is dangerous, as it could lead to a deflagration or even an explosion in the torch head. Therefore, using a permanent flame as a backup is the safest option. Based on what the poster has described, there should be at least two torches: one for startup purposes and another for the entire plant. Since they are designed separately, it indicates that the design conditions for the two flares are different. Although their design pressures are roughly the same, their design temperatures vary significantly. The flare used for startup is designed to discharge gasified emissions, and this gas has high-temperature properties. If the design temperature for the flares used throughout the plant is only 80°C or even room temperature, then it becomes clear why the gasified emissions are not sent to these plant flares. If high-temperature gas is discharged into a plant flare designed for normal temperature conditions, it will cause the flare pipelines to overheat, leading to a sharp decrease in the allowable stress of the materials, and flare pipeline accidents may occur.