Generally, the catalyst after oxygen-rich regeneration has a carbon content of <0.05%, and the activity of the regenerated catalyst is high. Oxygen-rich regeneration is due to complete combustion, and there is more excess oxygen in the flue gas, so the main wind consumption is larger; at the same time, since the carbon is burned completely, the heat is released. Therefore, the scorch load and the heat-receiving capacity of the regenerator are required to be large, and the main fan is required to have a large load. The conventional regeneration process (also referred to as the oxygen-lean regeneration process) means that the catalyst is in an oxygen-poor state (O: content in the flue gas is <0.5%), and the coke on the catalyst to be produced is burned off to restore the catalyst activity. Generally, the catalyst after normal regeneration has a fixed carbon content of 0.1%, and the activity of the regenerated catalyst is low. Oxygen-depleted regeneration is incomplete combustion, the CO in the flue gas is more, the oxygen is less, the heat released is less, and the main wind consumed is less. Therefore, under the same main air volume and heat extraction capacity, the oxygen-depleted regeneration can improve the regeneration ability of the catalyst, thereby improving the processing capability of the device. However, by conventional regeneration, the processing capability of the device can be significantly improved under the same device conditions. In actual production, if the regenerator takes insufficient heat load, it adopts complete regeneration, and the local temperature is too high, which may damage the catalyst structure and increase the heavy metal, so that the catalyst activity is lowered. Although the second catalytic device of Luoyang Refinery is fully regenerated, the activity of the regenerated catalyst should theoretically be high, but the activity has been very low. At about 58, after adding a new agent, the activity of the catalyst drops extremely fast. While the catalysis adopts conventional regeneration, the activity of the regenerated catalyst is relatively high. At about 62, according to the analysis data of the heavy metal content of the catalyst, it can be known that the catalytic content of the catalysis of the second catalytic device is higher than that of the first catalyst.
The characteristics and problems of the RFCCU regeneration system. Characteristics of RFCCU regeneration system (1) The regenerator adopts a single-stage pure countercurrent oxygen-enriched complete regeneration process, and is equipped with a specially designed catalyst catalyst distributor to form a single-bed countercurrent high-efficiency regeneration, and the catalyst and the main wind are reversely flowed to make the catalyst The charcoal burns more completely and the entire bed reaches a uniform burning power. (2) The two devices adopt a coaxial type with simple structure, which makes the operation of the pressure difference between the two devices more flexible and easy to operate. (3) Catalyst stripping adopts specially designed pre-stripping facility and two-stage stripping technology, which reduces the amount of hydrocarbon entrainment and reduces coke yield. Adjustment operation (1) When the regeneration pressure is kept constant, first increase the refining amount of the slurry and the fresh feed amount, and reduce the main air volume of the regenerator through the outlet of the main fan outlet and the angle of the small vane. (2) According to the CO, 0: content of the flue gas and the carbon content of the regenerated catalyst, and the scorch condition of the regenerator, the dense phase temper is used to control the dense phase temperature difference of the regenerator.
The influence of the change of regeneration mode on production has been greatly improved. The product distribution is ideal. The ideal catalyst regeneration mode is changed from full regeneration to conventional regeneration. The consumption of main wind is relatively reduced, and the processing capacity of the device is increased from the previous 172t/h. By 186t/h, it has increased by 14t/h. The device runs smoothly. Compared with the coke consumption index and the device yield index, the regenerative scorch ability can meet the processing capacity of the 20Ma device. According to the material balance tracking analysis of the device, the light oil yield is gradually increasing, and the conversion of diesel and gasoline yields with the working conditions of the device is gradually increasing. The device increased the throughput while the light oil yield increased by 1.5 percentage points, and the oil slurry yield decreased by 2.3 percentage points. The products are well distributed and the quality is qualified. The regenerator heat extraction system adopts internal and external heat extraction technology, and the external heat extractor adopts a gas-controlled external circulation heat extractor, which not only saves investment but also adjusts flexibility. The problem of the device is that although some advanced technology is used for catalysis, the main fan and the air pressure device of the device are both old and unsuitable for the processing capability of the device, so that the processing capacity of the device cannot meet the design requirements. . Mainly manifested in: (1) the main fan load is insufficient. The main air volume of the device design is 361Qm3/min. Although the regenerative pressure is reduced to 0.183MPa in operation, the main fan can only be operated up to 330m3/mln under the over-operation condition, which can not meet the wind requirement of the catalyst full oxygen-enriched regeneration process. (2) The yield of light oil is low. When the device increases the treatment capacity, the catalyst regeneration heat is excessive, causing the regenerator dense phase temperature to be high, and the heat load inside and outside the regenerator is no longer needed, so the oil slurry and the refining oil refining amount are reduced, and the oil slurry external volume is increased, up to 6% of the feed amount seriously affects the yield of light oil. (3) There are hidden dangers in equipment. If the processing capacity of the device is increased, the temperature of the regenerator flue gas is too high, and the air supply volume of the main fan is limited. Although the amount of combustion-supporting agent is increased, the effect is not good. (4) The equilibrium catalyst has low activity and the fresh catalyst has high unit consumption. Due to the increased throughput, high regeneration temperatures, and heavy metal contamination of the catalyst, the catalyst activity is low.
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