Control system and method for cooling high temperature solid bulk material in moving bed

Abstract

The invention discloses a control system and a method for cooling a high temperature solid bulk material in a moving bed. By detecting important parameters of the high temperature solid bulk material in the moving bed, and by controlling a discharging rate of a vibrating discharging machine, a blowing rate of a fan and flow of a slag pipe, a material layer in the bed is maintained at a certain height and is ensured of moderate cooling, and an ideal heat transfer requirement of the high temperature bulk material in the moving bed is reached. Specific control ideas can be summarized that according to monitor signals of a surface temperature of a bulk material accumulation layer, a height of the bulk material accumulation layer and a temperature of the bulk material in the discharging port, effective control in real time is conducted on a blowing rate of cooling air, a discharging speed of a vibrating bed and slag flow of the slag pipe; in the control process, a priority of a control parameter is set reasonably, and the control of the blowing rate of cooling air, the control of the discharging speed of the vibrating bed and the control of the slag flow of the slag pipe are perfectly coupled; and the effective controls of multiple working conditions can be achieved, and the moderation of the cooling effect of the high temperature solid bulk material in the moving bed is greatly improved.

Description

technical field [0001] The invention relates to the technical field of blast furnace slag waste heat recovery, in particular to a control system and method for cooling high-temperature solid bulk materials in a moving bed. Background technique [0002] At present, China is the world's largest steel producer, and its steel output has remained the world's largest for 17 consecutive years. In 2014, China's pig iron production reached 711 million tons, accounting for about 60% of the world's total steel production. During the iron and steel smelting process, a large amount of high temperature slag will be produced. It is estimated that the slag temperature of blast furnace slag can be as high as 1400-1550°C, and the sensible heat value per ton of high-temperature blast furnace slag can be as high as 1260-1880MJ / ton, which is equivalent to 60kg standard coal / ton. According to statistics, based on my country's existing iron and steel smelting technology, 0.3 tons of blast furnac...

AI Technical Summary

Problems solved by technology

Although the water quenching granulation method realizes the large-scale utilization of blast furnace slag, the processing process consumes a lot of water resources. It is estimated that processing 1 ton of high-temperature slag requires about 1 ton of fresh water and about 10 tons of recycled water.

In addition, a large amount of H is released during water quenching 2 S and SO 2 gas, corrodes buildings, damages equipment and deteriorates the working environment, and produces a large amount of water vapor at the same time, resulting in a huge waste of high-value sensible heat contained in blast furnace slag

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