System and method for detecting atmosphere components in rotary hearth furnace in real time and optimally controlling combustion

Abstract

The invention provides a system and method for detecting atmosphere components in a rotary hearth furnace in real time and optimally controlling combustion. The system comprises a pneumatic advancing and retreating device, a composite probe, an air source box, an instrument host and a PLC (Programmable Logic Controller), wherein the composite probe can do a reciprocating motion on a sliding guide rail and extend into the rotary hearth furnace so as to monitor data of the atmosphere components in the rotary hearth furnace; the air source box is used for controlling an air source of an air cylinder so as to drive the composite probe to move on the sliding rail and for detecting the pressure of the air source of the air cylinder; the instrument host is used for sending a control instruction to the air source box and the composite probe so as to control the composite probe to move on the sliding rail and collecting the monitoring data of the composite probe; and the PLC is used for optimally controlling a combustion model according to the monitoring data collected by the instrument host and sending an instruction to a combustion controller so as to optimize combustion conditions in the rotary hearth furnace. According to the system and the method, all data in the rotary hearth furnace are detected by the composite probe, and the combustion environment in the rotary hearth furnace is adaptively optimized according to all of the data, so that the combustion efficiency is improved.

Description

technical field [0001] The invention belongs to the field of iron-containing solid waste recycling control, and specifically relates to a real-time detection system for the atmosphere composition in a rotary hearth furnace and a combustion optimization control method. Background technique [0002] The direct reduction process of carbon-containing pellets in a rotary hearth furnace is very complicated. Carbon-containing pellets are a system in which many substances coexist and interact with each other, involving complex physical and chemical changes. After the raw material and binder are mixed and pressed, they are dried and transported to the hearth of the rotary hearth furnace. With the rotation of the bottom of the furnace, the charge passes through the heating zone and the reduction zone in turn, and more than 85% of the iron oxides are reduced. A large number of studies have shown that the carbon-oxygen ratio and air-fuel ratio are the most important factors affecting th...

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Problems solved by technology

[0003] At present, domestic and foreign rotary hearth furnaces use gas, air flow and temperature feedback to control the furnace combustion. Operators can only optimize the combustion environment according to the temperature in the furnace, and cannot obtain the CO produced by the high-temperature reaction of the pellets in the furnace. Therefore, in order to obtain the distribution of the atmosphere in the furnace, control the reducing atmosphere in the furnace, reduce excessive energy consumption, and guide stable production, it is necessary to develop new technologies

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