Multi-stage temperature difference frequency vibratory fluidization system and method for oxidizing and non-melting coal tar pitch pellets

Abstract

The invention discloses a multistage-heating difference frequency vibration fluidization system for oxidative infusibility of coal tar pitch spheres, which includes multiple stages of fluidized bed reactors and a temperature-controlling gas feeding apparatus, wherein the fluidized bed reactors are successively connected to each other in a stepwise distribution manner. Each fluidized bed reactor includes a shell, a porous distribution board, and a vibration exciter, wherein the shell is provided with a feeding inlet, a discharge outlet, an air inlet and an air outlet; the feeding inlet and thedischarge outlet are respectively disposed on two ends of the porous distribution board that is inclined from the feeding side to the discharge side; the discharge outlet of one fluidized bed reactoris connected to the feeding inlet of the next one fluidized bed reactor. The system significantly increases the oxidizing efficiency of the coal tar pitch spheres and reduces breaking ratio of coal tar pitch sphere granules.

Description

technical field [0001] The invention relates to a method for preparing coal tar pitch spherical activated carbon, in particular to a multi-stage temperature-rising differential frequency vibrating fluidization system and method for oxidizing and infusible coal tar pitch balls. Background technique [0002] Spherical activated carbon has excellent properties such as good sphericity, smooth surface, good fluidity, high mechanical strength, uniform packing density, controllable pore size distribution, fast adsorption and desorption, and strong physiological compatibility. As a key material, it is widely used in blood Processes such as purification, drug treatment, air purification and military protection play an irreplaceable role in high-tech fields such as medicine, aerospace, national defense, electronics, and environmental protection. [0003] Coal tar pitch pellets are one of the most important raw materials for the production of spherical activated carbon. The preparation...

AI Technical Summary

Problems solved by technology

This process takes a long time and consumes a lot of energy, and in many cases, the oxidized asphalt balls are prone to cracking or even cracking, which seriously affects the subsequent preparation process and the performance of the final product.

[0004] On the other hand, the gas-phase oxidation and non-melting of asphalt pellets in the industry currently mostly uses fixed-bed reactors, which have the following disadvantages: a large amount of light components and heat generated during the oxidation and non-melting process are difficult to take away, and the light components are accumulated in the After a certain concentration, it is easy to catch fire and ablate the material; in the absence of external forced mass transfer and heat transfer, it completely relies on the slow diffusion of oxidizing gas to the interior of the asphalt ball, and the oxidation heating rate is slow; the accumulation height is limited and the efficiency is low. The scale is difficult to scale up, which seriously limits the production and application of coal tar pitch spherical activated carbon

Patents CN201510311977X and CN201610479835 disclose a number of coal tar pitch ball oxidation and non-melting technologies, but most of them are invented or improved for the process reaction process or conditions, and the reaction devices are still mostly based on fixed bed or rotary furnace, which cannot completely solve the above problems , and the rotary furnace reactor proposed by patent CN201610479835 still faces the problem of insufficient contact between material and air

More importantly, since the coal tar pitch oxidation and infusion process involves a long air heating process, the existing reactor technology (fixed bed, rotary furnace, etc.) can only be fed intermittently during the production process and produced in batches. Continuous operation cannot be realized, the production efficiency is low, and the performance of different batches of products may vary

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