Weekly Topic – 20090305 – Does post-combustion of flue gas affect the operation of flue gas engines?
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During the operation of the flue gas machine, coke re-ignition occurs in the regenerator, as well as CO re-ignition in the flue gas. Please discuss to what extent afterburning can affect the use of smoke machines Are there any good ways to control the occurrence of afterburning? Please share some good practices based on the situation in your own company, so we can exchange ideas. Your support is the driving force that propels us forward! ! We kindly ask everyone to actively participate in the discussions. Our moderators will assign different levels of scores or rewards based on the depth of the discussions, and they will also review the scores given by members! ! ! On Saturday, a “Classic Reply” will be selected from all responses, awarding 3 Charm points. At the end of the month, participants take part in the monthly evaluation; those who win are rewarded with 5 Charm points. Those who are rated as having “Classic Replies” for three consecutive months receive 10 Charm points as a reward. The weekly topic will be updated on Monday. This post was last edited by brainandrain on 2009-4-4 14:13]
I don’t have any experience, but I guess a smoke extractor is a machine used to remove smoke. The high temperatures generated by combustion affect the smoke extractor; when materials are exposed to high temperatures, their allowable stress levels decrease, and moving parts as well as blades can deform. This eventually leads to damage. Even non-moving parts may lose their strength and deform, causing the entire machine to become damaged and unusable. To control backburning of smoke, two approaches can be taken: 1. Prevent air from mixing in with the smoke before it enters the extractor, thereby reducing its contact with oxygen. 2. If the smoke is too hot, it can first pass through some heaters to utilize the residual heat, thereby lowering its temperature before it is sent to the extractor.
Today, a circular economy is being promoted; hot flue gas can be utilized as a heat source in a waste heat boiler. This not only solves the problem posed by hot flue gas damaging smoke exhaust equipment, but it also allows for integration with environmental protection efforts, enabling applications for special funding. Many heavy industry plants are currently active in this area.
I don’t quite understand what the original poster is saying. The accumulation of toner in the exhaust fan can cause corrosion to the equipment; it also increases the resistance to the flow of smoke. What’s even worse is that it can lead to smoldering, which damages the equipment； In addition to the two points mentioned on the second floor, another solution is to control the toner and other substances present in the smoke; installing dust removal equipment or cyclone separators could be considered. This post was last edited by beileim1 on 2009-4-1 14:44]
As an important unit for recovering energy consumption in catalytic cracking, the performance of the flue gas extractor is directly related to the safe and stable operation of the plant. Regarding the phenomenon of afterburning in the reprocessed flue gas mentioned by the original poster, I believe such cases should be considered from two perspectives: The negative aspects are that the afterburning of flue gas results in noticeable changes in thermal and pressure energy for a device that is operating normally. These changes in process parameters inevitably lead to corresponding changes in the device itself, and the asynchronous progression of these changes constitutes damage to the device. Advantages: Since fouling of catalytic cracking flue gas turbines is a common phenomenon in various types of catalytic cracking units, the occurrence of fouling is one of the potential factors that cause excessive vibration in these units. Especially in recent years, the flue gas systems of various refineries have been working to find solutions to the problem of high vibration levels in these flue gas systems. From what I know, many of these manufacturers make use of the phenomenon of backburning in the rear part of the recycled flue gas to deal with scaling in the flue gas systems, and they also introduce air periodically into that rear area manually! By taking advantage of the differences in thermal expansion coefficients, it has been possible to reduce the accumulation and adhesion of scale, achieving certain results. In one sentence: Everything has two sides; it depends on how you view it!
Strictly control the oxygen content in the flue gas, keep the flue gas temperature below 550 degrees, and spray water to cool down promptly in case of afterburning