Automatic coal returning control method and system for cement kiln decomposing furnace under RDF condition

Abstract

The invention discloses an automatic coal returning control method for a cement kiln decomposing furnace under the RDF condition. The automatic coal returning control method comprises the following steps that S1, a three-dimensional fuzzy control system is constructed; s2, establishing a plurality of variable membership function models, respectively dividing the value domain of each variable into a plurality of grades, and respectively describing by using a corresponding discourse domain fuzzy language to obtain an assignment table; s3, establishing a first-stage fuzzy inference rule and a second-stage fuzzy control rule to obtain two fuzzy relation matrixes; s4, synthesizing the two-stage rule according to a fuzzy control synthesis rule, and obtaining a fuzzy calculation expression of the size of overlarge tailing coal feeding and the size of automatic tailing coal returning; and S5, inputting the analog quantity acquired in real time into a three-dimensional fuzzy control system, performing fuzzy domain transformation, outputting a control strategy, and completing automatic coal returning control of the cement kiln decomposing furnace under the RDF condition.

Description

technical field [0001] The invention relates to the field of cement kiln calciner control, in particular to a method and system for automatically returning coal to a cement kiln calciner under RDF conditions. Background technique [0002] The tail temperature control of the calciner has long been a difficult point in the control of the cement production process. Under the new situation, the calciner also undertakes social environmental protection work such as incineration of garbage / sludge. This process of co-processing of waste makes the temperature control system in the calciner The stability of the waste has been greatly impacted, and the most important negative impact is that a large amount of oxygen is consumed in the process of waste incineration, so that the oxygen content in the decomposition furnace is insufficient, the coal powder cannot be fully burned, the CO in the decomposition furnace rises sharply, and the tail temperature Once the oxygen content in the calci...

AI Technical Summary

Problems solved by technology

However, under RDF conditions, the tail temperature control of the calciner will be affected by many uncertain factors in the garbage. The most prominent negative impact is that a large amount of oxygen needs to be consumed in the process of burning garbage, resulting in insufficient oxygen supply in the calciner. The pulverized coal cannot be fully combusted, and the temperature in the decomposition furnace decreases. If the tail coal supply is increased to increase the tail temperature, it will cause further deterioration of the combustion environment and lead to a vicious cycle of continuous decline in the tail temperature. At this time, it is necessary to withdraw the coal in time. Adjust the combustion environment in the calciner in order to return to the normal oxygen-enriched combustion environment

As for whether the calciner adopts the method of coal removal, it is difficult to achieve a good control effect by using a single method based on the carbon monoxide content in the tail gas. The temperature control mode can no longer meet the needs of the cement production process in the new form

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