Undisturbed furnace changing control method for hot blast stove

Abstract

The invention relates to an undisturbed furnace changing control method for a hot blast stove. The undisturbed furnace changing control method comprises the following steps that 1, atmospheric pressure and temperature compensation are carried out on an air blower, and a compensated air outlet pressure value is r(t); 2, a furnace changing starting signal is obtained, and a stationary blade of the air blower is controlled to be increased to a preset opening degree; 3, the pressure value y(t) in a cold air pipe connected with the air blower is detected; 4, according to the pressure value y(t) and the air outlet pressure value r(t), PID control is adopted to adjust the static blade opening degree of the air blower, so that the pressure value y(t) is equal to the air outlet pressure value r(t); and 5, a furnace changing ending signal is obtained, and the PID control is stopped. According to the technical scheme, the problem of hot air pressure fluctuation caused by hot air furnace changing is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of hot blast stoves, and in particular relates to a control method for non-disturbance replacement of hot blast stoves. Background technique [0002] In iron and steel smelting technology, a hot blast stove is a heat exchange device that uses fuel combustion to heat the furnace, and then passes in cold air to turn it into hot air with a stable temperature and pressure required for blast furnace smelting. Because the hot blast stove is a regenerative structure, it needs to be heated in advance to store heat, and then the cold air can be continuously fed in to heat it to become hot air, and then continue to supply air to the blast furnace. As time goes by, the temperature of the hot blast stove gradually decreases, so it needs to be burned for heat storage again. So cycle. Therefore, each blast furnace is usually equipped with three hot blast stoves, such as figure 2 As shown, and adopt the "two burning and...

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Problems solved by technology

[0007]The hot blast stove adopts the above traditional furnace replacement method, the outlet pressure of the blower and the pressure of the cold air main pipe fluctuate greatly, generally at 15-20KPa, which further affects the stable production of the blast furnace

Moreover, since the pressure difference generated during the furnace replacement process needs a period of time to balance, the time for a furnace replacement can be as long as 15 minutes, sacrificing a certain amount of blast furnace production efficiency

[0008]In addition, the traditional furnace replacement process is very complicated and cannot take into account the operating conditions of the blower, which may easily cause the blower to enter the surge protection area

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