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Device and method for online measurement of residence time distribution of rotating packed bed

A technology of rotating packed bed and residence time, which is applied in the direction of material resistance, etc., can solve the problems of short residence time, difficulty in RTD measurement, and inability to directly apply rotating packed bed, so as to achieve accurate data and fully reflect the effect of detailed characteristics

Inactive Publication Date: 2010-08-04
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Since the rotating packed bed is a new type of equipment, there is no test method for the residence time distribution of the rotating packed bed in China, and the existing online measurement methods cannot be directly applied to the rotating packed bed due to the above-mentioned problems.
In addition, due to the extremely short residence time of the rotating packed bed (0.01 ~ 1s), coupled with the non-stop rotation of the rotor of the rotating packed bed, it is difficult to measure the RTD.

Method used

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  • Device and method for online measurement of residence time distribution of rotating packed bed
  • Device and method for online measurement of residence time distribution of rotating packed bed
  • Device and method for online measurement of residence time distribution of rotating packed bed

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The water flow rate is fixed at 50L / h, pumped into the rotating packing bed, sprayed evenly onto the inner surface of the packing through the liquid distributor, the rotor rotates at a speed of 100rpm, and the air flows at a gas flow rate of 1m 3 / h is sent into the rotary packing bed by the air compressor, and the inner and outer sides of the packing are equipped with cylindrical copper mesh electrodes. The average resistance value measured online by the data acquisition system is 13178.97Ω, the baseline conductance value obtained by taking the reciprocal is 0.000076S, and the average residence time of the rotating packed bed can be calculated as 0.56s.

Embodiment 2

[0037] The water flow rate is fixed at 250L / h, pumped into the rotating packing bed, sprayed evenly onto the inner surface of the packing through the liquid distributor, the rotor rotates at a speed of 2800rpm, and the air flows at a gas flow rate of 5m 3 / h is sent into the rotary packing bed by the air compressor, iron orifice plate electrodes are installed on the inside and outside of the packing, the electrodes are connected with electric wires, and the wires pass through the hollow shaft to transmit the electrical signal to the outside of the rotating packing bed through the mercury slip ring, and are collected by the data The online measurement of the system shows that the average current value obtained by the online measurement of the data acquisition system is 1.0828mA, and the average residence time of the rotating packed bed is calculated to be 0.01s.

Embodiment 3

[0039] The water flow rate is fixed at 150L / h, pumped into the rotating packing bed, sprayed evenly onto the inner surface of the packing through the liquid distributor, the rotor rotates at a speed of 840rpm, and the air flows at a gas flow rate of 10m 3 / h is sent into the rotating packing bed by the air compressor, and the inner and outer sides of the packing are equipped with silver mesh electrodes, which are connected with electric wires, and the wires pass through the hollow rotating shaft to transmit the electrical signal to the outside of the rotating packing bed through the mercury slip ring, and are collected by the data The average voltage value measured online by the system is 6.8201V, and the average residence time of the rotating packed bed is calculated to be 0.21s.

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Abstract

The invention relates to a device and a method for the online measurement of the residence time distribution of a rotating packed bed, belonging to the technical field of the online determination of the residence time distribution. The device comprises an electrode and an internal pipe, wherein the electrode is installed on the internal side and the external side of the non-conductive packing of the rotating packed bed, and the internal pipe is filled with tracer liquid. The electrode is connected with a slip ring through a conducting wire. The slip ring and a rotating shaft rotate synchronously and the slip ring is connected with a data acquisition system. The method is that gas and liquid with fixed flow are injected into the liquid distributor of the rotating packed bed, the tracer liquid is filled, the slip ring transmits electrical signals to the outside, electric signal data is acquired and residence time distribution function E (t) is obtained by adopting data integral calculation. The invention realizes the online measurement of the residence time distribution and has the advantages of that the real-time performance is high, the continuity is good, the detailed features ofliquid holdup can be comprehensively reflected and the like; and by adopting the conductance method, not only the error caused by the x-ray method, the ultrasonic method, the conductivity method andthe fluorescence method is overcome, but also the online measurement can facilitate the detection of the impacts of all kinds of impact factors of the residence time distribution on the liquid holdup.

Description

technical field [0001] The invention belongs to the technical field of on-line measurement of residence time distribution of liquids, and in particular relates to a device and method for on-line measurement of residence time distribution of a rotating packed bed by combining the conductivity of a solution with an electric circuit. Background technique [0002] Residence time distribution (RTD) is one of the important parameters for the performance of continuous operation reaction or separation equipment. The time taken by the fluid clusters from entering the equipment to leaving the equipment is called the residence time. Due to factors such as the uneven flow velocity distribution of the fluid in the equipment, the diffusion of the fluid, and the existence of dead zones in the equipment, the residence time of each fluid cluster in the equipment The length of time varies, thus forming a distribution of dwell times. [0003] RTD can reflect the mixing status of fluids in rea...

Claims

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Application Information

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IPC IPC(8): G01N27/08G01N27/07
CPCB29C48/762B29C48/92
Inventor 刘有智袁志国申红艳周莉骅
Owner ZHONGBEI UNIV
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