On-line pretreatment device for sample gas of ethylene cracking furnace and installing method thereof

Abstract

The invention relates to an on-line pretreatment device for sample gas of an ethylene cracking furnace. The device is a box-type unit. An inlet of the device is connected with an outlet of a vortex cooler through a stainless steel pipeline. An outlet of the device is connected with a sample operation system on the front section of an on-line chromatograph through a stainless steel pipeline and finally enters the on-line chromatograph. After the device is adopted, a sampling system of an original cracking furnace does not need to be improved. The on-line pretreatment device is simple and convenient to install, works stably and reliably, is not influenced by the variation of the environment condition and is convenient to use and maintain due to the adoption of the integrated design.

Description

technical field [0001] The invention relates to a processing device for sample gas of an ethylene cracking furnace, in particular, an online pretreatment device for sample gas of an ethylene cracking furnace and an installation method thereof. Background technique [0002] The petrochemical industry is the pillar industry of the national economy, and the ethylene plant is the leading device in the petrochemical industry. There are many methods for ethylene production, but the tube furnace cracking technology is the most mature. Most of the ethylene in the world is cracked by the tube furnace. legally produced. As an important device in the petrochemical production process, the main control goal of the ethylene cracking furnace is to control the cracking depth, production capacity and product selectivity. Effective cracking operations depend on accurate on-line analysis of the cracked gas at the outlet of the quencher. Due to the high temperature, high water content and comp...

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Problems solved by technology

[0004] During the actual operation of the cracking furnace online analysis system, the cracking online analysis sampling position is located at the product outlet of the cracking furnace. The sample temperature is high and contains a large amount of liquid heavy components such as water and tar. Because the sample inevitably contains liquid components and impurity particles, Pipelines are prone to blockage during the sampling process. In addition, due to the current problems in the pretreatment system, the samples entering the online chromatography contain more heavy components, causing contamination of the chromatographic column, and problems such as large fluctuation range and frequency of analysis data. Online chromatography Unable to operate continuously and stably, it is difficult to provide accurate basic data for controlling the cracking depth of the cracking furnace

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