Four-impulse control method for steam drum water level of converter

Abstract

The invention discloses a four-impulse control method for a steam drum water level of a converter. On the basis of the conventional three-impulse control, a smelting signal is added, a water replenishing amount is calculated according to a set oxygen blowing amount, and water replenishing time control is introduced, so that water is replenished to a steam drum in advance, and the phenomenon that the supplied water is not sufficient because the loading amount of a loading section is too large is avoided; therefore, the false water level of the steam drum is reduced. Moreover, the optimized control over steam of the steam drum is improved, so the amount of water overflowing along with steam is reduced.

Description

Technical field [0001] The invention relates to a steelmaking converter production process, and more specifically, to a four-impulse control method for the water level of a converter steam drum. Background technique [0002] The drum water level is an important parameter to ensure the safe production and water supply of the converter. For modern steel mills with advanced control, the allowable drum water storage fluctuation is getting smaller and smaller, so the water level must be strictly controlled within the specified range. The water level of the steam drum reflects the balance between load and feed water. Too high water level in the steam drum will cause steam to carry water and affect the separation effect of steam and water; too low water level will cause damage to the water circulation of the steam drum, which will easily cause all the water to vaporize and burn the steam drum or even explode. In addition to the normal factor of heating and vaporization, there are two fa...

AI Technical Summary

Problems solved by technology

However, the application of the three-impulse control on the steam drum control system of the steelmaking converter with a relatively large load cannot avoid the generation of false water levels

This is because in the early stage of steelmaking, it is mainly an oxidation reaction, the temperature rises quickly, the consumption of cooling water is large, the load of the steam drum is large, and it is easy to vaporize, resulting in a large internal pressure and a large number of air bubbles in the water. If the steam drum is controlled as pure water If the third impulse is controlled, there will be insufficient water supply, and the phenomenon of "false water level" will easily occur.

The appearance of false water level will lead to false report of water level alarm signal, and sometimes the smelting will be terminated due to signal chain; at the same time, the appearance of false water level will mislead the water replenishment information controlled by three impulses, and often occur due to smelting The load is heavy, the pressure in the steam drum rises rapidly, and the false water level also rises rapidly. In fact, the water consumption is large at this time, and water needs to be replenished in time. However, due to the rise of the false water level, the water level cannot keep up in time, so sometimes there will be low water level and water replenishment capacity. Insufficient phenomenon, eventually resulting in the termination of smelting

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