Fixed bed multiphase atomizing nozzle

Abstract

The invention provides a fixed bed multiphase atomizing nozzle, comprising a whirlcone, an inner nozzle and an outer nozzle which are coaxially arranged in sequence; the head of the whirlcone is provided with multiple first whirling grooves; the outer wall of the whirlcone and the inner wall of the inner nozzle define a liquid phase channel; the head of the inner nozzle is provided with a liquid phase spray orifice; the liquid phase channel is communicated with the liquid phase spray orifice by the first whirling grooves; the area of the end face of the head of the outer nozzle is 1.5-5 times the cross sectional area of the greatest cross section of the inner nozzle; the middle of the end face of the head of the outer nozzle is provided with a fixing hole; the outer wall of the inner nozzle and the inner wall of the outer nozzle define a gas phase channel; the end face of the head of the outer nozzle is provided with multiple whirling holes around the fixing hole, and the gas phase channel is communicated with the whirling holes; on the end face of the head of the outer nozzle, the outer sides of the whirling holes are further provided with multiple gas phase spray holes around the fixing hole, and the multiple gas phase spray holes are communicated with the gas phase channel. According to the atomizing nozzle, the atomizing angle and the atomizing diameter are both increased greatly, the atomizing effect is better, and the atomizing range is larger.

Description

technical field [0001] The invention belongs to the field of fixed beds, in particular to a fixed bed multiphase atomization nozzle. Background technique [0002] Propylene is an important basic organic raw material, mainly used in the production of derivative chemicals such as polypropylene, acrylonitrile, ethylene oxide, and acrylic acid. For a long time, propylene has mainly come from catalytic cracking in refineries and steam cracking of hydrocarbons. Facing my country’s energy pattern with more coal and less oil, it is of great practical significance to convert coal with low added value into propylene derivatives with higher added value . The methanol-to-propylene (MethanoltoPropylene, MTP) process is a process that uses coal-based methanol as a raw material and reacts on a ZSM-5 molecular sieve catalyst to produce propylene as the target product. [0003] However, during the operation of the MTP reactor, the service life of the catalyst and the yield of propylene are ...

AI Technical Summary

Problems solved by technology

[0005] The traditional atomizing nozzles for fixed beds have the following defects: firstly, the gas phase channel of the traditional atomizing nozzles is formed by the annular gap between the liquid phase nozzle and the gas phase nozzle, and this annular gap is in the form of "shrinking" In this structure, the extrusion effect of the gas phase flow on the liquid phase flow is very obvious, especially in the case of high load gas-liquid ratio, the atomization angle is even less than 15°, and the liquid phase distribution presents a state of high in the middle and low on both sides , so that the atomization range formed on the surface of the bed is very limited, even less than 1 / 3 of the required coverage, and the atomization uniformity is poor

In addition, due to the presence of solid impurities of uneven size in the liquid phase pipeline in the MTP reaction system, it is very easy to cause blockage and wear problems

In addition, since the feed temperature of the liquid phase material is between 35 °C and 75 °C, the temperature of the gas phase material is between 200 °C and 280 °C, and the local maximum temperature of the bed can reach 500 °C to 550 °C, so in the above atomization nozzle, The temperature difference between the inside and outside of the liquid phase nozzle changes greatly, so the thread connection between the liquid phase nozzle and the mounting end seat is prone to deformation and seizure due to thermal stress

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