What are the manifestations during the deactivation process of catalytic catalyst and how to judge it?
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What are the symptoms during the deactivation of catalytic catalysts, how to judge and how to extend the service life as much as possible
Then it mainly depends on the product distribution. If there is more dry gas and more oil slurry, less gasoline and liquefied gas, and more diesel, in addition to the problem of raw materials, it is the catalyst. Another thing is to look at the ratio of hydrogen to methane in the dry gas to see if the catalyst is poisoned by heavy metals.
The main phenomenon is that the load of the reactor and compressor increases (mainly the gas yield increases and the liquid yield decreases. ), the regenerator bed temperature rises (coke production increases), etc. The main method of prevention is generally to add passivating agent to the raw materials.
What the third floor said is not accurate enough. If the catalyst is not poisoned, it will not produce a lot of gas phase components.
After the catalyst is deactivated, the oil slurry yield is very high, which means that the yield of the target product decreases in the product distribution. Take a sample of the catalyst to analyze which situation caused it: 1. Heavy metal poisoning 2. The catalyst "thermal collapse" when exposed to steam or high temperature (regeneration temperature is higher than 750 degrees) Too much fine powder 3. The catalyst regeneration effect is not good Solution: 1. Add metal passivator to reduce the damage caused by heavy metals to the catalyst. 2. Dry gas is used for pre-lifting, and superheated steam is used for pre-lifting steam. 3. According to the properties of the raw materials, try to select appropriate catalysts and additives. 4. Improve the burning effect, but do not overheat.
Very well said! I will also continue to say a few words. Catalyst poisoning is a continuous process, and its symptoms gradually worsen. When the catalyst replenishment speed remains unchanged, the symptoms are: 1. The dry gas volume increases. Under the same processing volume, the compressor rotation speed increases or the number of air-cooling units is increased. 2. The load of the stabilizing tower decreases, and both liquefied gas and gasoline decrease. 3. The amount of recycled oil and oil slurry increases 4. The propylene yield in liquefied gas decreases 5. The hydrogen component in dry gas increases, and the amount of hydrogen sulfide increases 6 The olefin content of gasoline increases 7. The opening of the regeneration slide valve decreases