Controlling method for air single-preheating partitional directional selecting valve heat accumulating burner

Abstract

This invention discloses a heat-accumulation burner controlling method of the air single warm-up separate reversing valve which includes the burner ignition steps, opening the air cycling valve without flame sensing and assistant burner ignition if the furnace temperature is above 800 degree, main coal gas valve. The burning control steps are that it closes the smoke valve, opens the air valve and finally opens the coal gas valve if the burner is under use, then the burning control finishes. If the burner is not under use, the burning control steps will not be initiated. The warm-up control steps are that it closes the coal gas valve, closes the air valve and finally opens the coal gas valve if the burner is under use. This invention is of simple operation, high controlling quality, low developing cost, and convenient maintain. It is appropriate to the burning control of the mill furnace, annealing oven of the air single warm-up separate reversing valve.

Description

technical field [0001] The invention relates to a control method for a regenerative burner of an air single preheating discrete reversing valve. Background technique [0002] With the increasing attention to energy saving and environmental protection and the continuous progress of science and technology, a reversing system with simple structure, convenient control and strong reliability has appeared, making regenerative combustion technology widely used at home and abroad. [0003] Traditional heating furnaces generally use a device for recovering flue gas on the flue --- air waste heat exchanger (or air heat exchanger) to recover the heat taken away by the exhaust gas of the furnace. This method can reduce the temperature of the flue gas and increase the temperature of the combustion-supporting air entering the furnace, which achieves a certain energy-saving effect. But this method still has the following problems: the amount of recovered heat is limited, and the thermal e...

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Problems solved by technology

But this method still has the following problems: the amount of recovered heat is limited, and the thermal efficiency of the furnace is generally below 50%; the air preheater generally uses metal materials and ceramic materials, the former has a short life, and the latter has huge equipment and difficult maintenance; From the perspective of the furnace, after the temperature of the combustion air increases, the volume of the flame zone becomes smaller and smaller, and the temperature of the flame center becomes higher and higher. Local overheating also affects the life of local furnace refractory materials and metal components of industrial furnaces; the increase in combustion air temperature leads to an increase in flame temperature, a large increase in NOx emissions, and serious pollution to the atmospheric environment

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