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Rotary kiln and flue gas pipe network asymmetric characteristic dynamic control method thereof

A dynamic control and rotary kiln technology, applied in control system, auxiliary system of rotary kiln, air excess coefficient control, control equipment and instrument selection field

Pending Publication Date: 2021-03-19
BEIJING KDHY SCI & TECH DEV LTD
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Problems solved by technology

[0005] There are no published publications, documents or information on the dynamic control method of the asymmetric characteristics of the rotary kiln and its flue gas pipe network involving the air excess coefficient of the rotary kiln and the control technology of the external air intake of the rotary kiln

Method used

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  • Rotary kiln and flue gas pipe network asymmetric characteristic dynamic control method thereof
  • Rotary kiln and flue gas pipe network asymmetric characteristic dynamic control method thereof
  • Rotary kiln and flue gas pipe network asymmetric characteristic dynamic control method thereof

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Embodiment Construction

[0011] Basic terms and definitions: The excess air coefficient in the rotary kiln system is also called the excess air coefficient or excess air coefficient, which is defined as "the ratio of the actual air requirement to the theoretical air requirement during fuel combustion", represented by the letter α.

[0012] According to the definition, the air excess coefficient refers to the result obtained by the rotary kiln combustion system at the set air-fuel ratio, that is, the combustion effect of combustion-supporting air and fuel under the condition of the air-fuel ratio. The combustion effect does not include the effect of combustion caused by the intake of air outside the rotary kiln. Although the intake of air outside the rotary kiln may cause partial or complete combustion, compared with the combustion based on the air-fuel ratio, due to the intake of air outside the rotary kiln The amount is cold air, which will cause heat loss, so it has a negative impact, which is not co...

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Abstract

The invention discloses a rotary kiln and a flue gas pipe network asymmetric characteristic dynamic control method thereof, belongs to a rotary kiln control technology, and develops a rotary kiln external air inlet amount calculation mathematical model and an air excess coefficient calculation mathematical model. The inlet amount of rotary kiln external air is calculated through the argon contentdetected by flue gas analysis. The opening degree of an inlet valve of a kiln tail exhaust fan is adjusted according to the difference between an external air inlet amount set value and an external air inlet amount calculated value, so that the external air inlet amount of the rotary kiln is always controlled within a set value range; the air volume of a secondary fan, the air volume of a tertiaryfan and the air volume of a primary fan are adjusted according to the oxygen content and the carbon monoxide content which are analyzed and detected by the flue gas to control the air excess coefficient of the rotary kiln, so that the air excess coefficient of the rotary kiln is always controlled within a set value range; the energy conservation and emission reduction effects of improving the combustion efficiency, increasing the energy-saving amount of the exhaust fan, reducing the NOx pollution discharge amount and improving the production operation rate are achieved.

Description

technical field [0001] The invention belongs to the rotary kiln control technology, specifically the external air intake control technology and air excess coefficient control technology of the rotary kiln, and does not involve the auxiliary system of the rotary kiln; the invention does not involve the selection of control systems, control equipment and instruments. Background technique [0002] Rotary kiln is one of the kilns with a wide range of applications, covering metallurgy, cement, petrochemical, building materials and other industries. It is a large energy consumer and an important source of air pollution, producing a large amount of carbon dioxide, nitrogen oxides, dust and so on. [0003] The control strategy for the excess air coefficient in the prior art is to adjust the air volume of the secondary fan according to the difference between the detected oxygen content of the tail gas and the set value of the oxygen content obtained from experience. However, because ...

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Application Information

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IPC IPC(8): F27B7/42
CPCF27B7/42
Inventor 高毅夫高劼
Owner BEIJING KDHY SCI & TECH DEV LTD
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