Regarding the two riser reactors?

http://bbs.hcbbs.com/viewthread.php?tid=303868&highlight=%2Bbaidanjiang2008

I’m not sure what kind of information you’re looking for

Our company has just built a double riser catalytic cracking unit designed by the East China Research Institute, and it is now in normal operation. May I ask what information you are looking for?

Reply to Floor 4: Are dual lift pipes the same as two-stage lift pipes?

The two-stage lift tube catalytic cracking (TSRFCC) technology is a major innovative catalytic cracking technique that was developed over an 8-year period throughout the \"Ninth Five-Year Plan\" and the early stage of the \"Tenth Five-Year Plan\" period, with strong support from CNPC and under the direct leadership and organization of its Refining and Marketing Division. Addressing the problems existing in current catalytic cracking processes, this technology introduces for the first time the new concept of two-stage riser catalytic cracking, and conducts in-depth fundamental theoretical and laboratory research. Building on the achievements of laboratory research, this technology was first applied industrially at the Shenghua Refinery of China University of Petroleum, where the world’s first 100,000-ton TSRFCC industrial plant was constructed. The results of industrial tests confirmed the theoretical analysis and laboratory findings. Since its commissioning in May 2002, the unit has operated well with advanced technical parameters, achieving significant breakthroughs: (1) TSRFCC can greatly increase the degree of conversion of raw materials, boosting processing capacity by 20–30% compared to before ； (2) It significantly improves the product distribution: the light oil yield increases by 2–3 percentage points, the liquid yield increases by 3–4 hundredths of a percentage point, while the yields of dry gas and coke **decrease** ； (3) The product quality has improved significantly: the olefin content in gasoline has decreased by more than 20 percentage points, the density of diesel has decreased while its cetane number has increased; the sulfur content in both gasoline and diesel has been markedly reduced. Adopting TSRFCC can bring substantial economic benefits to enterprises. The TSRFCC technology was rated by experts as one of the top 10 scientific and technological advancements of China National Petroleum Corporation in 2002. Currently, this technology has been successfully applied in million-ton-scale industrial facilities at various petrochemical companies such as Liaohe and Changqing. This project has been included in the 2003 “**Torch Program**”.

I was wondering if anyone here has any information related to the two-stage lift tube technology used at the Petroleum University – specifically, the design work carried out by the East China Research Institute. This technology involves three systems: the reaction and regeneration section, distillation, and absorption and stabilization. The relevant materials include 1) structural diagrams of the various equipment, 2) reports on the operation and calibration of the facility, 3) reports on the evaluation of the crude oil, among others ? Could you give me one? ? Can I help you look up literature? ? It mainly involves information such as the structures of the lift tube reactor, regenerator, and settler, operation calibration reports, and feed evaluation? ? This post was last edited by newlgt on 2009-3-10 22:45]

I am a student currently working on research related to two-stage riser catalytic cracking. The two-stage riser was developed by the Petroleum University, while the East China Institute was responsible for its design. I would like to ask the friends present: Do the two-stage riser catalytic cracking units in your refineries aim primarily at increasing the yield of light oils? Could you please briefly provide the name of your refinery as well as the layout configuration of these two units (whether they are arranged side by side, coaxially, with a pre-heating furnace, etc.)? Would it be possible to share some schematic diagrams of the equipment with me? I’m thinking of going to the factory to collect data in a while, so I’m asking everyone. Thank you all! PS: Are the structural formats of the two-stage riser reactor developed by the Petroleum University and designed by the East China Institute basically the same? ? Is there a typical structural form? ? This post was last edited by newlgt on 2009-3-11 19:44]

http://bbs.hcbbs.com/thread-410867-1-1.html

Our factory is just as you described: it has dual lift pipes and a coaxial settler

Catalytic cracking units require low investment, have low operating costs, are adaptable to a wide range of feedstocks, yield high amounts of light products, and rely on mature technology. They represent a major source of profit for refineries, and for a long time to come they will remain the most important method for oil processing companies to convert wax oil and residue into high-value light oils. At present, 80% of the gasoline and about one-third of the diesel used in China come from catalytic cracking units. In 1936, the world’s first fixed-bed catalytic cracking industrial unit was built. In the 1960s, with the advent of molecular sieve catalytic cracking catalysts, fluidized-bed catalytic cracking technology was developed and has been in use to this day. In recent years, various types of catalytic cracking catalysts have been developed to suit different feedstocks and processing methods, allowing for tailoring solutions to specific needs” ； Around the riser reactor, significant improvements have also been made in aspects such as the feed atomization nozzles, the pre-rising section, and the final gas-solid separation equipment. All these technological advancements have made significant contributions to increasing the yield of the desired products in the catalytic cracking process. However, over the past half century, there has been a tendency to focus on developing \"heavier\" catalysts while researching \"lighter\" process technologies. Due to the increasing heaviness and inferior quality of oil resources, as well as the rapid rise in demand for light petroleum products, the feedstocks processed in catalytic cracking are becoming increasingly heavy. Therefore, improving the yield of target products and enhancing product distribution have always been the main focuses of advancements in catalytic cracking technology. However, with the increasingly stringent environmental regulations and the accelerated improvement in the quality of gasoline and diesel, catalytic cracking, especially heavy oil catalytic cracking, is now facing an unprecedented situation. It is an urgent task to reduce the olefin content in catalytically cracked gasoline while ensuring that the yield of the desired products and the octane rating of gasoline remain unchanged. The rapid development of the petrochemical industry has led to a significant increase in the demand for propylene. The catalytic cracking process enables the efficient and large-scale production of propylene, and it has become a model for combining oil refining with the production of chemical raw materials. Simply reprocessing catalytic cracking gasoline or using deolefination catalysts, as well as increasing the residence time of the reaction stream in the reactor to reduce the olefin content in gasoline, always comes at the expense of gasoline yield, total liquid yield, or diesel quality【3 J. With the support of China National Petroleum Corporation, the University of Petroleum (East China) successfully developed the two-stage riser fluid catalytic cracking (TSRFCC-Two-Stage Riser Fluid Catalytic Cracking) technology. Compared with traditional catalytic cracking technologies, the TSRFCC technology offers high operational flexibility, enabling a significant increase in the processing capacity of the unit and the yield of target products. It also allows for an increase in the diesel-to-gasoline ratio, an elevation of the cetane number of diesel, an effective reduction in the olefin content of catalytic cracking gasoline, or a substantial increase in the yield of low-carbon olefins such as propylene. 1 Process description of TSRFCC technology: As shown in Figure 1, the reaction system of TSRFCC technology breaks away from the traditional single riser reactor design and the conventional reaction-regeneration process. An optimized two-stage riser reactor replaces the original single riser reactor, thereby creating a new reaction-regeneration system with two separate cycles. Unlike the “dual riser technology,” which involves adding a separate reactor for gasoline treatment on top of a conventional catalytic cracking reaction regeneration system, the TSRFCC technology features two riser reactors that have been optimally designed based on research into the chemical reaction engineering principles underlying the catalytic cracking process. Fresh catalytic cracking feed enters the first riser reactor where it reacts with regenerated catalyst. The oil-sludge mixture goes to a settler for separation of the oil from the sludge, while the oil and gas proceed to a distillation column. The coked catalyst is then stripped and sent to a regenerator for coking and regeneration ； The circulating oil (including the unreacted catalytic cracking feed in the first lift column, namely the heavy oil from that column, as well as the reprocessed oil and slurry) enters the second lift column reactor where it reacts with the regenerated catalyst. The oil-catalyst mixture then goes to a settler for separation of the oil from the catalyst, while the gas is sent to a distillation tower. The coked catalyst is stripped and then sent to a regenerator for coking and regeneration. In the second stage riser reactor, in addition to recycled oil, the feed can include some catalytic cracking gasoline depending on the production objectives; if the goal is to produce more low-carbon olefins or to minimize the olefin content in the gasoline, then the catalyst cracking gasoline feed nozzle is located at the bottom, while the recycled oil feed nozzle is located at the top ； When the production goal is to produce more gasoline and diesel with a moderately reduced level of olefins in the gasoline, the nozzle arrangement is reversed: the gasoline feed nozzle is located above the circulating oil.

http://bbs.hcbbs.com/viewthread.php?tid=303868&highlight=%CB%AB%CC%E1%C9%FD%B9%DC http://bbs.hcbbs.com/viewthread.php?tid=364097&highlight=%CB%AB%CC%E1%C9%FD%B9%DC http://bbs.hcbbs.com/viewthread.php?tid=46544&highlight=%CB%AB%CC%E1%C9%FD%B9%DC I hope these will be useful to you

The two-stage riser catalytic cracking (TSRFCC) technology, jointly developed by the School of Chemical Engineering of China University of Petroleum (Huadong) and the China National Petroleum Corporation Huadong Design Institute, is a process technology aimed at increasing diesel yield, raising the total liquid yield, and reducing the olefin content and sulfur content in gasoline. The refinery of Shandong Shida Technology Co., Ltd., affiliated with China University of Petroleum (Huadong) – the Shenghua Refinery – successfully carried out industrial scale-up tests using this technology for the first time; to date, nine units have been designed or modified using this technology. The core of this process technology is: catalyst relay, high oil-to-catalyst ratio, short reaction time, and staged reactions. At an intermediate stage of the reaction, when the catalyst activity declines to a certain level, the catalyst and the reaction gas/oil are separated in a timely manner; the components that need to continue reacting come into contact with the regenerated catalyst from the regenerator in the second riser to proceed with the reaction. With two risers and without recycled gasoline, the light oil yield, particularly the diesel yield, is very high ； When producing clean gasoline primarily to reduce the olefin and sulfur content in gasoline, part of the crude gasoline is reprocessed and the reaction temperature is lowered, thereby increasing the proportion of desirable secondary reactions such as isomerization, hydrogen transfer, aromatization, and alkylation ； When it is necessary to produce large amounts of liquefied gas and propylene, the reaction temperature is appropriately increased to make reactions such as alkane cracking and olefin cracking dominate. This approach also helps to increase the diesel-to-gasoline ratio, reduce the olefin and sulfur content in gasoline, thereby producing high-octane, clean gasoline. The operation results of the industrial unit show that by applying two-stage riser catalytic cracking technology, the total liquid yield and diesel yield of the unit increased significantly, while the yields of dry gas and coke decreased. The quality of gasoline and diesel improved markedly, with the sulfur content reduced by more than 20% ； Without gasoline reprocessing, the olefin content decreases by 4–5 percentage points; in the second stage of reprocessing crude gasoline, it is possible to effectively reduce the olefin content in catalytic gasoline to below 35%.