Oxygen-enriched and all-oxygen combustion roller kiln combustion control method

Abstract

The invention discloses a method for controlling the combustion of an oxygen-enriched and full-oxygen combustion roller kiln, a pulse-combustion control method. The mixture ratio of the oxygen and the fuel gas is automatically adjusted by the separate closed-loop feedback control of oxygen and fuel gas, and meanwhile, the mixture ratio is corrected by real-time controlled variable according to the burnt curve; subsequently, under the action of the two signals, the fuel gas and the oxygen actuator adjusts in real-time the fuel gas valve and the oxygen valve, and realize and maintain the preset optimal combustion control ratio; a supervisory computer is used to sample and process the kiln in real-time, then the given quantity of pulse duty-ratio confirmed by the burnt curve is corrected to achieve the real-time controlled variable; and finally, the actuator is controlled and adjusted by the pulse manipulator in real-time to achieve optimal combustion control. The invention is highly efficient, energy-saving, environment-friendly, etc. The oxygen in the combustion atmosphere in the kiln can be kept at more than 21 percent of the volume content and is mixed with fuel gas for combustion; in addition, the proportions of the oxygen and the fuel gas as well as the combustion time are adjusted automatically.

Description

technical field [0001] The invention relates to the field of combustion control methods for industrial kilns, in particular to a method for automatically adjusting the combustion ratio of gas and oxygen mixture in the combustion process of oxygen-enriched and full-oxygen combustion ceramic roller kilns, using high-concentration oxygen including pure oxygen as the Supporting gas, using the control method of pulse combustion control mode. Background technique [0002] At present, domestic ceramic kilns generally adopt the form of continuous combustion control, that is, the temperature and combustion atmosphere in the furnace can meet the process requirements by controlling the flow of fuel and combustion air. Because this continuous combustion control method is often restricted by the regulation and measurement of fuel flow, the control effect of most kilns is not good at present. However, high-grade ceramic products have higher requirements on the uniformity of the temperatu...

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Problems solved by technology

However, to achieve this ratio adjustment, it is necessary to set up different pipe diameters to connect pipelines. If a variety of different combustion ratios are to be adjusted, the pipelines of this method will be very complicated and the cost of this method will be increased.

Moreover, at present, the adjustment of auxiliary gas and gas in the kiln is generally an open-loop adjustment, which can only be adjusted strictly according to the proportion of the firing curve in the host computer or controller, and local fine-tuning cannot be carried out within a certain range. Good to meet the firing requirements of the process

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