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Mini-hydrocyclone solid removing method and device for medium oil in fractionating tower of ethylene unit

An ethylene device and micro-swirl technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of expensive filter elements, excessive mesh holes, and increased filtration pressure drop, and reduce investment and maintenance costs, improve operating capacity, and prolong the effect of service life

Active Publication Date: 2014-11-05
SHANGHAI HUACHANG ENVIRONMENT PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used method for decoking medium oil in ethylene plants is to add a screen-type pipeline filter to the medium oil circulation loop. Judging from the operating conditions of the filter, it has the following problems: (1) Screen If the hole is too large and the coke powder is too fine, the decoking effect of the filter is not ideal; (2) When a fine screen is selected, the filtration pressure drop will increase again. Coke discharge affects the normal operation cycle; (3) The filter element is expensive, and frequent replacement will greatly increase the operating cost of the device
Therefore, the quenching oil cyclone is not suitable for the separation of medium oil coke powder, and it is necessary to develop a method and device for medium oil coke powder cyclone separation and recovery with higher separation accuracy

Method used

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  • Mini-hydrocyclone solid removing method and device for medium oil in fractionating tower of ethylene unit
  • Mini-hydrocyclone solid removing method and device for medium oil in fractionating tower of ethylene unit
  • Mini-hydrocyclone solid removing method and device for medium oil in fractionating tower of ethylene unit

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Experimental program
Comparison scheme
Effect test

Embodiment

[0051] For the experimental methods without specific conditions indicated in the following examples, the conventional conditions or the conditions suggested by the manufacturer are usually followed.

[0052] An ethylene system device

[0053] The fluid properties are as follows:

[0054] The density of medium oil is 998.2kg / m3, the kinematic viscosity is 2.18mm2 / s, the temperature is 155 ℃, the pressure is 0.4~0.6 MPa, and the coke content of medium oil is 0.15%.

Embodiment approach

[0056] Using the industrial sideline method, a pipeline is drawn from the middle of the ethylene fractionation tower, and the coke powder and other solid particles in the middle oil are removed by using the ethylene fractionation tower, the medium oil micro-swirl desolidifier, and the heat exchanger in series.

[0057] Implementation Effect:

[0058] concentration

[0059] As the flow rate decreases, when the coke powder content at the inlet is basically stable at about 0.15%, the coke powder content at the overflow port (purification outlet) is not more than 0.07%, and the concentration at the bottom flow port is nearly 2.4%.

[0060] granularity

[0061] It can be seen from the particle size analysis that the particle size of the imported coke powder is concentrated below 500mm, and 90% is below 400mm. After the cyclone treatment, the recovery rate of coke powder particles below 30mm is 70%, and 99% of the coke powder particles above 100mm are removed. .

[0062] efficien...

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Abstract

The invention provides a method for removing fine solid particles from medium oil in a fractionating tower in an ethylene unit. The method comprises the following steps of: performing mini-hydrocyclone separation on medium oil extracted from an ethylene cracking fractionating tower to remove fine solid particles entrained by the fractionating tower; concentrating coke powder entrained in the medium oil stepwise by performing multi-stage mini-hydrocyclone separation; performing hydrocyclone concentration or filtering separation on a solid particle enrichment phase; and recovering the medium oil and coke powder respectively to reduce the discharge amount of solid wastes. The invention further provides a device for removing fine solid particles from medium oil in the fractionating tower in the ethylene unit. According to the method and the device, the heat exchange efficiency of medium oil is increased, the erosion of coke powder entrained in the medium oil on a pipeline and equipment is reduced, continuous running period of the entire device is ensured, and the energy consumption is lowered.

Description

technical field [0001] The invention relates to the field of energy and environmental engineering, in particular to a micro-swirl flow desolidification method for oil in a fractionation tower of an ethylene plant, and also relates to a micro-swirl flow desolidification device for oil in a fractionation tower of an ethylene plant. Background technique [0002] The ethylene industry is the leader of the petrochemical industry. The ethylene, propylene and butadiene produced by it are the basic raw materials of petrochemical industry. The output of ethylene is one of the important symbols to measure the integrated development level of a country's petrochemical industry. The entrainment of coke powder in the fractionation tower of the ethylene plant will cause the blockage of pipelines, heat exchangers and other equipment in the medium oil system, resulting in insufficient circulation of the medium oil and the decline in heat transfer performance of the heat exchanger. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D36/04
Inventor 马良黄渊闫超吴精平诸泽人徐忠蒋帮勇王锋吴志光
Owner SHANGHAI HUACHANG ENVIRONMENT PROTECTION