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On-line measuring method for one section outlet acetylene concentration of acetylene hydrogenation reaction chamber

A technology of acetylene hydrogenation and reactor, which is applied in the direction of measuring devices, specific gravity measurement, instruments, etc., and can solve problems such as not being able to work in the optimal operating state

Inactive Publication Date: 2005-11-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] At present, most domestic ethylene plants use the basic control functions of Distributed Control Systems (DCS) to monitor the production process. These basic control systems ensure the safe operation of production plants, but they cannot make them work in the optimal operating state.

Method used

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  • On-line measuring method for one section outlet acetylene concentration of acetylene hydrogenation reaction chamber

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Embodiment Construction

[0018] The present invention will be further elaborated below in conjunction with embodiment:

[0019] Implementation example

[0020] Firstly, the main process operating parameters that affect the concentration of acetylene at the outlet of the first stage of the hydrogenation reactor are obtained in the DCS: the flow rate of carbon distillate in the feed, the amount of hydrogen in the first stage, the temperature difference of the reactor, and the concentration of acetylene at the outlet of the first stage of the hydrogenation reactor at the corresponding time. Analyze the values ​​and normalize these data to the range [0.2, 0.8], the normalization method is as follows:

[0021] x=(X-a) / ((b-a)×0.6+0.2

[0022] Among them, X is the input variable, [a, b] is the range of X, and x is the normalized input. The range of the carbon distillate flow in the feed is taken as [50000, 80000], the range of hydrogen in the first stage is taken as [500, 1...

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Abstract

The invention discloses an on-line method for measuring the density of acetylene from a outlet of the ethylene device hydrogenation reactor. It chooses some critical variables which impact this kind of density: the quantity of carbon 2 passed into the reactor, the input variables including the quantity of hydrogen and the temperature difference of the reactor, which are used for the soft measure model. The invention makes use of the nerve network model on the DCS system platform of ethylene producing device, collects samples continuously and calculates in time to measure the density of ethine from an exit of the ethylene device hydrogenation reactor by online.

Description

technical field [0001] The invention relates to an online soft measurement method for the concentration of acetylene at a section outlet of an acetylene hydrogenation reactor, belonging to the field of automatic control of chemical reaction processes. Background technique [0002] The acetylene hydrogenation reactor is an important equipment in the ethylene plant, which plays a pivotal role in the quantity and quality of ethylene production, and its control effect directly affects the improvement of ethylene yield and the operation stability of subsequent processes. In order to control the reactor well, the concentration of acetylene at the outlet of the reactor must be measured in time, and the reactor can be deduced and controlled according to the concentration of acetylene at the outlet of the reactor. Since there is an online analyzer at the outlet of the second section of the reactor to analyze the concentration of acetylene and hydrogen at the outlet of the second sect...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 钱锋李绍军吴斌
Owner EAST CHINA UNIV OF SCI & TECH
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