Electric Spark Alloying of Radiant Coils for Pyrolysis Furnaces

Mikhail Taymarov,Elena Saltanaeva,S Bratan,S Roshchupkin

doi:10.1051/matecconf/202134602024

Mikhail Taymarov, Elena Saltanaeva + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/202134602024

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Abstract

Currently, the petrochemical industry uses furnaces to produce ethylene, the main element of which is radiant coils designed for the decomposition of straight-run gasoline into pyrolysis gas, which is the main product for producing ethylene. In radiant coils, the gasoline decomposition process must take place at a temperature of about 800 °C with a high heating rate in order to avoid coking of the coils. Heat is supplied by radiation from the inner lining of the furnaces heated by the flame of flat-flame gas burners. For radiant heat transfer to occur, the surface of the coils must have a high degree of blackness. This article presents the developed technology for coating heating surfaces with shungite and the results of increasing their emissivity to intensify radiant heat transfer. Measurements of the emissivity after electrospark alloying were carried out by the radiation method, according to which, according to Kirchhoff’s law, the emissivity is equal to the emissivity at equal temperatures.

Highlights

The heating surface of radiant coils in pyrolysis furnaces perceives heat due to radiation from the heated inner lining of furnaces, in which natural gas is burned in flat flame burners [1, 2]
With an increase in the degree of emissivity, the amount of heat received by the radiant coils increases and the process of decomposition of straight-run gasoline vapors in them accelerates to obtain pyrolysis gas, which is processed into ethylene
To determine the degree of emissivity by the radiation method, the emissivity of the metal of the heating surfaces is investigated at equal temperatures

Summary

Introduction

The heating surface of radiant coils in pyrolysis furnaces perceives heat due to radiation from the heated inner lining of furnaces, in which natural gas is burned in flat flame burners [1, 2]. The main characteristic of the efficiency of radiant heat transfer for coils is their emissivity depending on temperature [3,4,5,6,7]. With an increase in the degree of emissivity, the amount of heat received by the radiant coils increases and the process of decomposition of straight-run gasoline vapors in them accelerates to obtain pyrolysis gas, which is processed into ethylene. To determine the degree of emissivity by the radiation method, the emissivity of the metal of the heating surfaces is investigated at equal temperatures. As applied to pyrolysis furnaces, the monograph [3] gives the results on the normal integral degree of emissivity for Cr15Ni80 steel without an alloy. Further experimental studies of the directional degree of blackness of metals and, in particular, steels used in pyrolysis furnaces are relevant

Preparation of samples for research using electrospark alloying with shungite

Procedure for measuring the integral emissivity of samples

Сalculation of experimental errors

Results obtained and their discussion