Air supply control method and system for oxygen-enriched combustion cement rotary kiln

Abstract

The invention discloses an air supply control method and system of an oxygen-enriched combustion rotary cement kiln. The control method comprises the following steps that firstly, the primary air oxygen partial pressure PO2 is adjusted and is gradually increased from 20 percent; secondly, the inner radiation intensity I and the content of NOx in tail gas of the oxygen-enriched combustion rotary cement kiln are obtained according to primary air oxygen partial pressure PO2 values; thirdly, the saved cost delta E for producing unit clinker is obtained; fourthly, when the saved cost delta E for producing unit clinker is not increased any more, the primary air oxygen partial pressure PO2 stops being increased. The system comprises a CCD detector, a tail gas flue gas analyzer, a primary air oxygen concentration analyzer, a primary air aperture controller, an oxygenerator and an upper computer. According to the air supply control method and system of the oxygen-enriched combustion rotary cement kiln, the optimization of the combustion economical efficiency of the rotary kiln is achieved, a selection scheme of the primary air oxygen concentration of the optimal oxygen-enriched combustion is provided, the vacancy in the technology is filled up, and the economical benefits are improved.

Description

technical field [0001] The invention belongs to the field of combustion control of a cement rotary kiln, and more specifically relates to an air supply control method and system for an oxygen-enriched combustion cement rotary kiln. Background technique [0002] Low-quality coal is difficult to ignite and embers. In the past, the use of low-quality coal in rotary kilns was mostly achieved by reducing the fineness of coal powder and reducing the primary air volume. Reducing the fineness of pulverized coal will increase the power consumption of the coal mill, and reducing the primary air volume will easily cause adverse effects such as burner blockage and fluctuations in combustion conditions. Due to the limitation of coal mill output and coal injection system, many rotary kilns do not have the conditions to burn low-quality coal. When the supply of coal is tight, cement plants are often constrained by the supply of coal types, resulting in insufficient operation. [0003] In...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides an oxygen-enriched combustion cement rotary kiln air supply control method and system, the purpose of which is to provide a set of An economical and environmentally friendly oxygen concentration adjustment scheme and equipment for oxygen-enriched combustion, which solves the technical problem that the existing oxygen-enriched combustion control technology cannot comprehensively consider the economic performance of oxygen-enriched combustion

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