Device and method for filling catalyst on line by pneumatic transmission

Abstract

The invention relates to a device and a method for filling a catalyst on line by pneumatic transmission. The filling device comprises a catalyst filling tank. The filling tank comprises a cone flow guide body, a nitrogen distributor, an ejector and a heating coil. The cone flow guide body is positioned in a lower sealing end of an equipment cylinder. The heating coil is positioned on the middle lower part of the equipment cylinder. The ejector is positioned at the bottom of the cone flow guide body and comprises a gas transmission pipe, an ash bin, a contraction segment, a choke tube, an expansion segment and a joint pipe sequentially from top to bottom. The on-line filling of the catalyst can be realized by filling high pressure hydrogen into the ejector, pumping catalyst particles into the ejector and making the catalyst particles enter a reactor under the drive of hydrogen flow. The device has a simple structure and does not need transferring oil. The transferring process is stable. A pipeline cannot be blocked. The device is suitable for continuously or discontinuously filling the fresh catalyst into the fluidized bed reactor on line.

Description

technical field [0001] The invention relates to an online filling device and method for pneumatic conveying catalyst, which belongs to the field of petrochemical industry and is suitable for adding catalyst into a reactor, especially for adding catalyst online into an ebullated bed reactor. Background technique [0002] Solid particle transportation problems exist in petrochemical, environmental protection, mining metallurgy, electric power and other fields. Generally, solid particle conveying methods include mechanical conveying, air conveying and hydraulic conveying. [0003] The use of hydraulic transportation to transport solid particles to the closed system usually requires a pulping process, and a slurry pump is used to inject it into the equipment. There are complicated procedures, a large number of equipment, large power consumption, serious wear of the pump, short operating cycle, and a large amount of maintenance. , high operating costs and other shortcomings. At...

AI Technical Summary

Problems solved by technology

Its advantages are short process flow, simple structure, flexible layout, and easy automation; its disadvantages are pipeline wear, material crushing, and the system needs to be explosion-proof

[0004] Chinese patent ZL200420086396.8 (CN2764742Y) discloses a surge type pneumatic conveying device, which is composed of a storage bin, a sending tank, a gasification nozzle and multiple sets of valves, with a complex structure and poor reliability

Chinese patents 200510059627.5 (CN1686603A), 99104300.6 (CN1259478A) disclose a catalyst particle counter pressure conveying method and its device, including an upper container, an intermediate container and a lower container, which are composed of decompression, charging, pressurizing and unloading Four processes, the process is more complicated

This process requires online injection of the catalyst. If only hydraulic flushing is implemented, a high-temperature, high-pressure pump needs to be installed, and the solid content of the transported slurry cannot be effectively controlled: when the solid content is high during the flushing process, it is easy to block the pipeline and cause wear and tear. For valves and equipment, when the solid content rate in the flushing process is too low, the required flushing liquid volume is large, which has a great influence on the boiling state and temperature field of the reactor

Images