Self-adaptive low-nitrogen calcination control system for cement kiln and method thereof

Abstract

The invention discloses a self-adaptive low-nitrogen calcination control system for a cement kiln and a method thereof, and the system comprises a pre-decomposition system, a rotary kiln system and anintelligent control system, and the pre-decomposition system collects related parameters in a decomposition furnace and transmits the related parameters to the intelligent control system. The intelligent control system controls and adjusts the total coal feeding amount, the distribution amount of several coal feeding points and the distribution amount of different feeding points according to corresponding parameters; the rotary kiln system collects relevant parameters in the rotary kiln and transmits the relevant parameters to the intelligent control system, and the intelligent control systemcontrols the frequency of a primary air fan, the kiln head coal feeding amount and the opening ratio of air valves inside and outside a combustor according to the corresponding parameters. Accordingto the method, the clinker yield and quality and NOx emission are closely related and deeply fused for the first time, the effect of actively adjusting and controlling the NOx emission is achieved, the problems of hysteresis quality, large fluctuation and the like of a manual control system are solved, the production cost is remarkably reduced, the stability of the yield and quality is improved, NOx emission is reduced by over 35% in the comprehensive process, and the tail end treatment cost of NOx is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent control of cement production, in particular to a cement kiln adaptive low-nitrogen calcination control system and method. Background technique [0002] At present, my country's cement clinker production has entered a stable period, with an average annual output of about 1.8 billion tons. However, the status quo of overcapacity, high labor intensity, and low intelligence in the clinker production process still exists in the cement industry. Especially the increasingly stringent environmental protection policies, more and more provinces have joined the ultra-low emission team. At present, most of the cement clinker production systems in China are basically manual operations, and for pollutant emissions, especially NOx emissions, the passive treatment of terminal selective non-catalytic reduction (SNCR) is the main method. , the degree of integration between the production process and the disch...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a cement kiln adaptive low-nitrogen calcination control system and method to solve the problems of large fluctuations in manual control and low correlation between clinker production and NOx emissions in the cement clinker production process

Images