Online particle sampling unit of minitype fluidized bed and application thereof

Abstract

The invention relates to an online particle sampling unit of a minitype fluidized bed and application of the online particle sampling unit. The online particle sampling unit comprises a back blowing system, a reaction system, a scavenging system and a differential pressure sampling system; the back blowing system and the scavenging system, which are independent mutually, are used for back-blowing a sampling tube and scavenging a sampling bottle respectively, inert gas constantly purges the sample tube during sampling, the taken-out catalyst particles are ensured to be from a fluidized bed layer; a three-way valve adjusting part is used to control the flowing of blowback air, sampling and the back pulse jetting of the blowback air, so that particles cannot be left on the sampling tube and the sampling bottle, and the back blowing efficiency is greatly improved; and the catalysts can be quantitatively taken out by pressure control of the differential pressure sampling system and the volume control of the sampling bottle. The online particle sampling unit has the advantages that the catalysts can be quantitatively taken out, the sampling tube and the sampling bottle can be completely back-blown and scavenged, and no residual particles are left.

Description

technical field [0001] The invention belongs to a microfluidized bed online particle sampling device and its application. Background technique [0002] Traditional research on catalyst reduction, evaluation, deactivation, regeneration, etc. is usually carried out in a fixed bed, but due to the inhomogeneous distribution of catalyst particles in the fixed bed, the reaction states of catalyst particles at different loading positions are not the same. The characterization performed may not necessarily be representative of the entire catalyst bed; in addition, the traditional research method can only wait for the end of the reaction before taking out the catalyst, and only fresh and reacted catalyst particles can be obtained. Change information, lack of appropriate research tools. [0003] The micro fluidized bed has good mixing performance, the catalyst particles are evenly distributed in the fluidized bed, and are in the same reaction state, which can ensure that all the cata...

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Problems solved by technology

For example, the Chinese patent (CN 200996898 Y) designed a fluidized bed axial multi-point parallel negative pressure solid particle sampling device, which is applied to the study of the distribution of each phase in the fluidized bed, because the patent is mainly used in the fluidized bed Research on the distribution of solid particle concentration, there is no design of backflushing sampling tube in the patent; Chinese patent (CN 202255960 U) designed a fluidized particle sampling device and sampling system, mainly used for circulating fluidized bed sampling, the patent It has a backflush system but its backflush system is mainly used to purge the residual catalyst in the vacuum system, and does not backflush the sampling tube; Chinese patent (CN 203365172 U) designed a high temperature, high pressure, flammable solid fluidized The bed sampling device solves the phenomenon of material burning when sampling in a fluidized bed of high temperature, high pressure, and flammable solids. Although the patent has the backflush of the sampling tube, the pressure relief operation of the sampling bottle is required before sampling to be able to sample smoothly. Otherwise, the sampling The device cannot be effectively backflushed; the Chinese patent (CN 2655219 Y) has designed a negative pressure particulate matter sampling device, which uses negative pressure to sample the inside of the device. This patent uses the same inert gas source to purge the sampling bottle and sample The pipeline can only be purged successively for the sampling bottle and the sampling pipeline, and the purging and vacuuming of the sampling pipeline cannot be carried out simultaneously; Sampling of solid particles in a reducing atmosphere. This patent removes the air between the fluidized bed sampling port and the sampling tank by releasing a small amount of particulate matter before sampling, which causes waste of catalyst particles in the fluidized bed reactor. A small amount of catalyst can not be ignored in laboratory research; Chinese patent (CN 102032997 A) has designed a gas-liquid-solid three-phase simultaneous sampling device for fluidized bed reactors, which is used for gas The liquid and solid three phases are sampled at the same time. The patent introduces an inert backflush gas to backflush the sampling tube during the reaction process. However, in the transformation design of purging and sampling, there must be a large dead volume, resulting in The backflush is not complete, there will still be some particles remaining in the sampling tube

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