Method for controlling outlet air temperature of direct-combustion hot blast stove

Abstract

The invention discloses a method for controlling the outlet air temperature of a direct-combustion hot blast stove. The combustion process, flue gas purifying and cold air mixing are controlled as a whole; by analyzing historical data, the mutual restrictive relation among the coal quality index of fuel coal, the thickness of the fuel coal, the fire grate speed, the combustion supporting air flow, the primary combustion hearth temperature, the secondary combustion flue gas temperature, the cold air flow and the outlet air temperature is found out; a feedforward control model is established, when a system runs, repeated model correction is performed through a method that the feedforward control model is combined with process feedback control, and rolling optimization is performed on the control process; and under the situation that the combustion condition changes, positive adaptation can be fast adjusted, the optimal air-coal ratio and the cold blast rate needed by a mixing chamber are guaranteed, the outlet air temperature is made to be stabilized, the temperature difference of + / -3 DEG C is achieved, the heat supply process is stable and adjustable, and the purposes of stable production and energy saving are achieved.

Description

technical field [0001] The invention relates to the technical field of coal direct-fired hot blast stove control, in particular to a method for controlling the outlet air temperature of a coal direct-fired hot blast stove. Background technique [0002] The hot blast stove is the equipment equipped with the drying tower and an important part of the milling production line. Although the price of coal, which is rich in domestic resources, has also risen, compared with natural gas and oil, its price advantage is obvious. The successful development and development of various hot blast stove technologies using coal as fuel can replace fuel oil and gas hot blast stoves, and its unit energy consumption has been greatly reduced. Various coal-fired hot blast stoves that replace oil will be the future development trend. [0003] The coal direct-fired hot blast stove is composed of a coal burner, a high-temperature gas purification settling chamber and an air supply chamber. Coal is ...

AI Technical Summary

Problems solved by technology

At the current stage, the temperature control of the hot blast stove already has an automatic control system such as programmable controller or PLC control. These control technologies are mostly used on combustion media such as gas and gas. There is a big difference, so these control systems are not suitable for direct-fired coal-fired hot blast stoves where coal is directly burned

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