Forecasting method for descending depth of material surface of blast furnace during furnace shutting down

Abstract

The invention provides a forecasting method for the descending depth of a material surface of a blast furnace during furnace shutting down. The method comprises the following steps of: forecasting the material surface depth at a regular preset time unit during the descending operation of the material surface of the blast furnace, in particular, computing the ton coke air loss according to the cold air blast flow and the coke consumption quantity on the latest normal smelting day before the blast furnace is shut down, taking the ton coke air loss as the ton coke air loss during descending operation of the material surface of the blast furnace, computing the air quantity at the current time according to the ton coke air loss, and carrying out the amortized computation on the air quantity at the current time based on the air pressure P0 and the air temperature T0 at the latest normal smelting day before the blast furnace is shut down; computing the coke burning quantity and the furnace burden consuming space at the current time; computing the accumulated value of the furnace burden space at the current time; computing the stock level data at the current time through the accumulated value of the furnace burden space at the current time by utilizing the linear relationship between the accumulated value of the furnace burden space and the stock level data; computing the descending speed of the material surface; and computing the required remaining time when an expected furnace shutting down time is reached.

Description

technical field [0001] The invention belongs to the field of blast furnace ironmaking, and in particular relates to a method for predicting the depth of a blast furnace shutdown level. Background technique [0002] Blast furnace shutdown is the shutdown operation before the overhaul, medium repair and minor repair of the blast furnace, and is an integral part of the blast furnace operation. Blast furnace shutdown at the material level is a common process operation before long-term blast furnace maintenance. It is generally required to lower the material level to the tuyere area to minimize the difficulty of blast furnace cleaning after shutdown and reduce the time and cost of blast furnace maintenance. However, if the prediction of the position of the falling material level is inaccurate and the position of the final material level is too high, it will increase the difficulty of cleaning the blast furnace after the shutdown, and increase the construction period and cost of b...

AI Technical Summary

Problems solved by technology

However, if the prediction of the position of the falling material level is inaccurate and the position of the final material level is too high, it will increase the difficulty of cleaning the blast furnace after shutdown, and increase the construction period and cost of blast furnace maintenance; if the position of the final material level is too low, then A large number of tuyeres are blown out, which can easily form explosive gas and affect the safety of furnace shutdown

Images