Natural gas roasting grooving method

Abstract

The invention discloses a natural gas roasting grooving method. The method comprises the following steps that a main electromagnetic valve and branch electromagnetic valves are opened; a mixed gas ofa natural gas and air reaches a first gas branch pipe through a gas main pipe and then enters into a second gas branch pipe; then the mixed gas sprayed from a nozzle is ignited through an igniter, andlow-temperature roasting is performed on an electrolytic cell through a high-temperature flame; and in a low-temperature roasting stage of the electrolytic cell, a heating rate is controlled to makethe temperature in an area I to the area VII of the electrolytic cell be slowly increased to about 200 DEG C, and then an opening degree of the main electromagnetic valve is controlled through the controller. Through setting the low-temperature roasting stage, a low-temperature heat preservation stage, a medium-temperature roasting stage, a medium-temperature heat preservation stage, the high-temperature roasting stage and a high-temperature heat preservation stage, and a stepped natural gas roasting method, problems that a temperature rise rate is too fast, temperature rise time is too short,and cracks are easy to occur on the surfaces of components in the electrolytic cell are avoided, and a service life of the electrolytic cell is prolonged.

Description

technical field [0001] The invention relates to the technical field of electrolytic aluminum, in particular to a method for forming grooves by roasting natural gas. Background technique [0002] Electrolytic aluminum is aluminum obtained by electrolysis. The modern electrolytic aluminum industry uses cryolite-alumina molten salt electrolysis method. The molten cryolite is the solvent, alumina is the solute, the carbon body is the anode, and the aluminum liquid is the cathode. After a strong direct current, electrochemical reactions are carried out on the two poles in the electrolytic cell at 950°C-970°C. Before starting the electrolytic cell, the aluminum electrolytic cell must be roasted. Its purpose has the following aspects: 1. Dispel the moisture in the lining material of the tank; 2. Sinter and carbonize the tamping paste between the cathode carbon blocks of the tank lining and between the cathode carbon block and the side lining, and form a whole with the lining carbon...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for roasting natural gas to solve the problem of poor uniformity, large damage to the electrolytic cell, and difficulty in accurately controlling the temperature.

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