Control method for improving gas recovery of new OG (Oxygen Converter Gas Recovery) converter

Abstract

The invention provides a control method for improving gas recovery of a new OG (Oxygen Converter Gas Recovery) converter. The control method comprises the following steps: 1) feeding back a pressure signal of micro differential pressure of a converter mouth, a position signal of an annular gap scrubbing tower and rotation speed of a dust exhausting fan to a PLC (Programmable Logic Controller); 2) detecting the content of gas and the content of CO through a gas analyzing instrument, and igniting and diffusing the gas in a diffusing tower when the contents do not meet the recovery condition; 3) adjusting the micro differential pressure of the converter mouth by self-optimizing model switch control; and 4) starting to recover the gas when the gas analyzing instrument detects that the gas meets the requirement on collection. According to the control method for improving gas recovery of the new OG converter, a movable smoke hood, an annular gap hydraulic control device and the dust exhausting fan are coordinated and controlled by the PLC, the self-optimizing switching control mode is adopted, so that the micro differential pressure of the converter mouth in blowing can quickly reach the range of 0 to 10Pa and the stable state during blowing, and as a result, the content of the gas and the content of CO in of the converter can meet the requirement on collection within a short time, and the purpose of improving the recovery rate of the gas of the converter can be realized.

Description

technical field [0001] The invention belongs to the field of converter steelmaking and relates to a control method for improving recovery of new OG converter gas. Background technique [0002] China is a big country in steel production, and converter gas is a very important secondary energy source in steel production. At present, the average recovery of converter gas in my country is 50-90Nm 3 About / t, increasing the recovery of converter gas can effectively reduce the production cost of steelmaking, improve the utilization rate of secondary energy, and greatly improve the total pollutant emission of steel production under the severe situation of the domestic steel industry. [0003] The converter gas at 1400℃~1600℃ produced during the oxygen blowing of the converter is drawn by the fan, cooled to below 900℃ through the movable cover skirt and the soda flue, and then enters the spray tower for coarse dust removal and further cooling and concurrently Extinguishing; [000...

AI Technical Summary

Problems solved by technology

[0006] In the actual process of converter steelmaking, when the first dust removal operation room receives the blowing start signal, the operator will increase the speed of the dust removal fan to the rated speed, and then control the furnace mouth of the converter by adjusting the cone lift of the annular seam washing tower. Slight differential pressure, but it is difficult to meet the differential pressure at the furnace mouth in a short time when the movable hood is lowered to a low position and the dust removal fan is at the rated speed and by adjusting the opening of the cone of the ring seam washing tower.

Images