A method and device for extracting slurry bed cleaning liquid

Abstract

The invention discloses a device and method for extracting clean liquid from a slurry bed in an environment-friendly and energy-saving manner. It mainly includes the following steps: the slurry in the S1 slurry bed is siphoned into a material collection pipe, and then sprayed into a settling tank, and the solid particles are discharged into a settling tank. Settling in the settling tank and returning to the slurry bed through the feeding pipe; the supernatant in the S2 settling tank flows upward along the settling pipe, and turns down at the intersection of the pipes to flow into the clear liquid pipe and then into the clear liquid transition tank; S3 clear liquid The liquid transition tank discharges liquid through overflow to maintain a constant liquid level and the pressure required for siphon; the gas in the S4 sampling pipe enters the escape pipe and is continuously discharged to ensure that the liquid level in the escape pipe is always higher than the pipe intersection. Then ensure that the slurry bed and the clear liquid transition tank are always connected and the liquid level is equal. The device of the invention has simple structure, simple process flow, safety and reliability, is not prone to failure, is easy to realize large-scale continuous operation, easy to adjust separation efficiency and precision, has small equipment investment, low operation cost, and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of slurry beds, in particular to a method and device for extracting cleaning liquid from a slurry bed. Background technique [0002] Compared with fixed bed reactors, slurry bed reactors can use solid particles with smaller particle sizes without worrying about the problem of excessive bed pressure drop. The use of small particles can significantly reduce the resistance of the internal diffusion step, enhance the contact mass transfer between fluid and solid phases, and increase the macroscopic reaction rate. However, the slurry bed reactor must face the problem of how to separate these small particles from the liquid phase product, that is, how to extract clean liquid from the slurry bed. Liquid-solid separation is not only a need to improve the purity of liquid phase products, but also a need to improve the utilization efficiency of solid catalyst particles. How to effectively realize large-scale, contin...

AI Technical Summary

Problems solved by technology

But there are also three disadvantages: one is that the separation accuracy is not high, and the top flow liquid phase often contains a certain amount of small particles, which often requires secondary separation; the other is to increase the speed at which the slurry enters the hydrocyclone (to improve the separation efficiency) and accuracy), or in order to make the underflow concentrated slurry return to the slurry bed smoothly, it is often necessary to use expensive slurry pumps to pump the slurry, which increases investment costs and operating costs; the third is the slurry pump and the particles in the hydrocyclone The wear is more serious, increasing the amount of solid particles, and the fine powder produced at the same time will further increase the difficulty of separation in the next cycle, causing a vicious circle

[0007] To sum up, so far, there is still no green, environmentally friendly, energy-saving and simple device or method that can achieve large-scale liquid continuous operation while maintaining high separation efficiency and precision

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