SU553833A1 - Tubular furnace for pyrolysis of hydrocarbons - Google Patents

Description

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 refers to the chemical and petrochemical industry, it is intended for the production of ethylene.

A known tubular furnace for the pyrolysis of hydrocarbons, comprising a convection chamber and a radiant chamber located above it. The radiant chamber is equipped with heating elements, made, for example, in the form of panel burners l. In the center of the radiant chamber there is a vertically placed product pipe for heating hydrocarbons. The disadvantages of this furnace are the low-intensity heat transfer to the product pipe and the irregularity of its heating.

The purpose of the invention is to intensify the heating of hydrocarbons.

The goal is achieved by the fact that a heat pipe with conical louvers is installed inside the product cooctio pipe, provided with an annular slot around the periphery to control the condensate flow.

FIG. 1 shows the proposed furnace; in fig. 2 is a section along A-A in FIG. 1.

The furnace contains a convective 1 and a radiant 2 chambers, the latter being made in the form of a vertical cylinder with walls / assembled from flameless burners. In the center of the radiant chamber, there are two coaxially arranged pipes — heat 3 and product 4. An annular shutter B between the concentric tubes of the reaction zone, which is heated from the outside by the burners 5, and the condensed steam from the outside.

At the lower end of the heat pipe 3 3 5 mounted steam generator 6, zapol. molten salt, and inside the pipe - conical louvers 7 with a calibrated annular gap 8 along the peg. riferium to regulate condensate runoff. Salt evaporation occurs 14 genre tubes 9 steam generators

The furnace works as follows. First, burn the burner 5, in

5, the convective chamber 1 and further through the annular gap B serves water vapor. At. when the temperature rises to 700.750 ° C, feedstock is fed into the annular gap, and the amount of water vapor is reduced to the norm. As the temperature rises to the required one in the generator 6 with flame tubes 9 filled with molten salts, they evaporate. The steam from the generator in the heat pipe rises

5 and condenses on its heat transfer wall. Condensate on a calibrated annular gap 8 conical louvers 7 flows along the wall. The annular gap provides for regulation (condensate drain that flows along the wall). Such a louvre design allows evenly supply heat from the condensing liquid to the entire surface of the heat pipe.

raw material

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Claims (1)

TUBULAR FURNACE FOR PYROLYSIS OF HYDROCARBONS, including a convective chamber and a radiant chamber located above it with heating elements made, for example, in the form of panel burners, and placed in the center of the product pipe, characterized in that, in order to intensify the heating of hydrocarbons, inside a heat pipe coaxially mounted with a conical louvre equipped with an annular slot around the periphery of the product pipe to control the flow of condensate.