On-line detection method for tube coking thickness of delay coking heating stove

Abstract

The invention relates to an on-line detecting method for delaying the coking of a furnace tube in a radiation chamber of a coking heating furnace, belonging to the technical field of automatic control of heating furnaces. The method is characterized in that the furnace tube is segmented according to the tube wall temperature measuring position and the water injection position of the heating furnace; process variables which are actually measured are collected, the total heat transmission resistance and the convection heat transmission resistance in different positions of the furnace tube of the heating furnace are obtained by on-line computation through process calculation and mathematical models such as heat transmission, reaction, and the like in the furnace tube of the heating furnace, and then, the coking thicknesses of the furnace tube in different positions are determined. The observed coking result can provide reference for production operation and decoking so as to improve the security and the economical efficiency in the process of the operation of devices. On the basis of the method, the relationship between the coking rate and each operating parameter of the furnace tube can be researched, the coking rate can be forecast, and reasonable controlling and optimizing methods are designed to delay the coking of the furnace tube.

Description

technical field [0001] The invention relates to an online calculation method for the coking thickness of a furnace tube of a delayed coking heating furnace, belonging to the field of petrochemical tubular heating furnace and automatic control of production process. Background technique [0002] The lightening of heavy oil and residual oil is one of the most important issues in the development of refining technology in the world. Delayed coking is the processing process of converting residual oil into gas, light and middle distillate oil and coke through deep cracking and condensation reaction at high temperature, which is one of the thermal processing processes. Delayed coking technology is mature, it can process low-quality residual oil with high residual carbon value and heavy metal content, and the investment and operation costs are relatively low. Delayed coking is one of the main means of vacuum residue conversion in the world, and it is also the only process that can ...

AI Technical Summary

Problems solved by technology

These methods can predict the effect of operating parameters, etc. on the coking rate, but are not suitable for the monitoring of industrial installations

Because the properties of raw materials and operating parameters of industrial devices often change during the operation cycle, and the above method is equivalent to open-loop prediction of coking rate from the control point of view, lack of verification and correction means, and the properties of raw materials are not easy to obtain online in real time, and There are many parameters and a large amount of calculation

Some scholars have also established the relationship between coking rate and operating parameters by means of experiments, such as Zhou Xiaolong et al. for industrial installations

[0006] At present, the on-site judgment of the coking condition of the furnace tube mainly depends on the naked eye observation, and there is no online method for calculating the thickness of the coking section by section in the literature searched.

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