Oxygen pressure adjustment apparatus and adjustment method for electric furnace

Abstract

The invention discloses a adjusting method of an oxygen pressure adjustment apparatus for an electric furnace. The oxygen pressure adjustment apparatus is characterized in that an oxygen gas total pipe is connected to a burning nozzle and an oxygen gun respectively through a main pipeline and a branch, the main pipeline is provided with a main pipeline shut-off valve and a main pipeline adjustment valve, and the branch is provided with a branch adjustment valve. With application of the structure, the oxygen pressure adjustment apparatus has the following advantages that: pressure adjustment of the electric furnace oxygen gas total pipeline can be achieved with a low cost, the change on the existing pipeline is less, and normal electric furnace use is not affected.

Description

technical field [0001] The invention relates to the field of electric furnace steelmaking, in particular to an oxygen pressure regulating device and method for electric furnaces. Background technique [0002] In modern large-scale electric furnace steelmaking, in addition to energizing the electrodes, oxygen lances and nozzles are also used to blow oxygen into the furnace for auxiliary heating. There are several modes of oxygen blown in: burner ignition, burner preheating, burner cutting, burner refining, etc. The amount of oxygen is switched according to the set value of different time periods in different modes. The minimum oxygen consumption is about 480Nm3 / h, with different modes and stages, the set value step increases, and the maximum oxygen consumption set value is above 16000 Nm3 / h. The process requires that the pressure sent from the external main pipe of oxygen be steadily reduced from 2.3MPa to and maintained at about 1.2MPa. [0003] At present, the method of r...

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Problems solved by technology

However, in some occasions, if the buffer tank (gas distributor) cannot be configured due to space or capital constraints, at this time, due to the large and small flow difference of more than 40 times, it is difficult to meet the requirements of pressure reduction and pressure stabilization with only one pressure regulating valve For example, when the large flow rate is adjusted, the pressure is stable, but when the flow rate is reduced, the decompression is very slow, the working pressure cannot drop, and the pressure is high; when the small flow rate is adjusted, the pressure is stable, but when the flow rate is increased, the valve will oscillate. Work pressure can't be stabilized

[0004] Some domestic steel mills use specially customized imported self-operated regulating valves (such as fisher self-operated valves) for control in this regard. Although they meet the process requirements, the regulating effect is not particularly satisfactory.

In addition, the customized imported high-pressure oxygen self-operated pressure regulating valve is very expensive, and a single valve basically costs more than 200,000 yuan. In addition, spare parts are expensive and the procurement cycle is long, which is not conducive to the stability of production and cost reduction and efficiency increase.

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