Automatic ignition control system and method for hot blast stove

Abstract

The invention discloses an automatic ignition control system and method for stove burning of a hot blast stove. The system at least comprises an air slope setter, an air flow signal selector, an air flow adjuster, a coal gas slope setter, a coal gas flow signal selector and a coal gas flow adjuster. According to the method, after a combustion signal is received, an air flow set value output to the air flow adjuster by the air slope setter is gradually increased, and a combustion-supporting air adjusting valve is controlled to gradually increase an air flow; the coal gas flow set value on an input port of the coal gas slope setter follows the air flow actual-measurement value to be gradually increased, and is output to the coal gas flow adjuster, and a coal gas adjuster is controlled to increase the coal gas amount, so that ignition is achieved; an ignition task is completed until the air flow actual-measurement value is equal to the set value of the air slope setter, and the coal gas flow actual-measurement value is equal to the set value of the coal gas slope setter; and finally, the normal stove burning process is executed through the air flow adjuster and the coal gas flow adjuster. According to the system and method, flow stable control can be effectively achieved, the coal gas flow follows the air flow actual-measurement value to achieve proportional control, and automatic and safe ignition is achieved.

Description

technical field [0001] The invention is applied in the technical field of automatic control of blast furnace ironmaking, and in particular relates to an automatic ignition control system and method for a hot blast stove. Background technique [0002] The hot blast stove occupies an important position in the blast furnace ironmaking process. It heats the checker brick regenerator in the furnace by burning gas, and then heats the cold air passing through the hot blast stove regenerator to about 1200°C and sends it to the blast furnace to produce blast furnace coke. and coal injection to provide combustion temperature and oxygen; generally, a blast furnace is equipped with 3 or 4 hot blast stoves, and adopts 2 firing and 1 delivery, 3 burning and 1 delivery, 2 burning and 2 delivery, cross-parallel connection and other furnace replacement systems, each hot blast stove Because the working process is different, it is divided into three states: air supply, simmering furnace, and c...

AI Technical Summary

Problems solved by technology

[0003] The combination of gas flow and air flow in the ignition process determines whether the ignition process is safe. If the gas is first followed by the air, deflagration will easily occur and cause damage to the combustion chamber structure of the hot blast stove; if the amount of advance and excess air is too much, It will also cause excessive heat loss in the hot blast furnace

Therefore, realizing the safe, energy-saving and stable ignition of the hot blast stove is a problem in realizing the automatic control of the hot blast stove. At present, most blast furnace hot blast stoves are ignited by manual direct control of the valve positions of the gas and air regulating valves for ignition. After the ignition is completed, Switching to automatic or semi-automatic control of gas flow and air flow will increase the labor intensity of operators, and may cause deflagration due to problems such as regulating valves, lines, and combustion-supporting fans.

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