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Catalytic cracking cold-hot catalyst pre-lifter

A catalytic cracking and cold catalyst technology, applied in the field of catalytic cracking cold and hot catalyst pre-lifters, can solve the problems of catalyst hydrothermal deactivation, poor device operation stability, long particle residence time distribution, etc.

Inactive Publication Date: 2012-10-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you want to achieve uniform particle mixing, you also need a longer particle residence time distribution, so it also has the disadvantages of large riser resistance, poor device operation stability, and severe hydrothermal deactivation of the catalyst.

Method used

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  • Catalytic cracking cold-hot catalyst pre-lifter
  • Catalytic cracking cold-hot catalyst pre-lifter
  • Catalytic cracking cold-hot catalyst pre-lifter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 A typical form of the cold and hot catalyst pre-lifter of the present invention is given, such as figure 1 As shown, the cold and hot catalyst pre-lifter includes a section of pre-lifting cylinder (5) with a diameter of 1.2 to 3 times the diameter of the riser reactor (14), the height of which is 1 to 2 times the diameter, and the riser reactor (14) is connected by a cone section (7), and a head (9) is arranged at the bottom. The pre-lifting cylinder is provided with a concentric circular guide cylinder (3), so that the pre-lifting cylinder is divided into two connected areas, an inner ring (I) and an outer ring (II). The ratio of the diameter of the deflector cylinder (3) to the diameter of the pre-lift cylinder (5) is 0.5-0.9. The height is 0.5 to 1.8 times the diameter of the pre-lifting cylinder (5). A hot catalyst feed pipe (4) and a cold catalyst feed pipe (8) are arranged circumferentially on the pre-lifting cylinder (5). The catalyst feed pipes are loca...

Embodiment 2

[0031] figure 2 Another typical form of the cold and hot catalyst pre-lifter of the present invention is given, and figure 1 The difference in the structure shown is that a diversion tube (3) of a different structure is used, and in addition, a different main pre-lifting air (C) introduction structure is used. Such as figure 2 As shown, the guide tube (3) is divided into two upper and lower sections along the height direction, with an annular gap in the middle. The height of the guide tube (3) including the annular gap is 0.5 to 1.8 of the diameter of the pre-lifting cylinder (5) Times. The existence of the annular gap will change the internal circulation flow pattern of the particles, such as figure 2 As indicated by the middle arrow, the lateral mixing of particles can be further enhanced. Another difference is that a shower head type gas distributor (11) is installed at the end of the main pre-lifting air pipe (1), so that the main pre-lifting air (C) can be more evenly i...

Embodiment 3

[0033] See image 3 This embodiment is a method of using the pre-riser of the present invention in a catalytic cracking unit. The pre-lifter (12) is any pre-lifter structure included in the present invention, such as the structure described in the first embodiment or the second embodiment. Such as image 3 As shown, two strands of regenerated catalyst are drawn from the regenerator (13), one strand enters the pre-elevator (12) through the hot catalyst feed pipe (4) as the hot catalyst feed, and the other strand is introduced through the inclined pipe (15) To the catalyst cooler (16) for cooling to reduce the temperature of the catalyst, as the cold catalyst feed, enter the pre-lifter (12) through the cold catalyst feed pipe (8), and enter the riser reactor (14) after mixing with the hot catalyst ). This embodiment can obtain a larger catalyst-to-oil ratio without affecting the performance of the regeneration system, which is beneficial to increase the number of catalyst acti...

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Abstract

The invention provides a catalytic cracking cold-hot catalyst pre-lifter which is suitable for a catalytic cracking lifting pipe reactor with at least one cold catalyst feeding and one hot catalyst feeding. The pre-lifter comprises a pre-lifting cylinder (5), a hot catalyst feeding pipe (4) and a cold catalyst feeding pipe (8), and is characterized in that a guide cylinder (3) is arranged in the pre-lifting cylinder (5) and divides the pre-lifting cylinder (5) into two communicated areas that is an inner ring (I) and an outer ring (II); and the hot and cold catalyst feeding pipes (4 and 8) are arranged between the upper edge and the lower edge of the guide cylinder. With the adoption of the pre-lifter, the cold catalyst and hot catalyst are uniformly mixed and subjected to heat exchange in a short residence time, so that the requirements of catalytic cracking reactions are satisfied effectively, the catalytic cracking reaction is strengthened and the thermal cracking reaction is inhibited, the conversion rate of the devices is increased and the selectivity of products is enhanced.

Description

Technical field [0001] The invention relates to a catalytic cracking cold and hot catalyst pre-lifter, belonging to the technical field of petroleum processing. technical background [0002] Fluid catalytic cracking is one of the core light oil production processes of modern oil refineries. It uses molecular sieve catalysts to crack low-value heavy raw materials (wax oil or residual oil) into high-value light oils, such as gasoline , Diesel and liquefied petroleum gas. In China, the core position of the fluid catalytic cracking process is more prominent. It produces 70% to 80% of commercial gasoline, about 30% of commercial diesel and about 30% of propylene. [0003] In the catalytic cracking process, the catalyst-oil ratio is an important operating parameter that affects the distribution of the catalytic cracking product. It determines the number of catalyst active centers per unit volume of the riser reactor. Therefore, the catalyst oil should be increased under the conditions o...

Claims

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Application Information

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IPC IPC(8): B01J8/08C10G11/00
Inventor 范怡平朱丽云张永民鄂承林王祝安卢春喜
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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