Waste heat utilization process for rotary kilns

Abstract

The invention discloses a waste heat utilization process for rotary kilns. The process includes the steps of firstly, preheating tail gas of a body of a rotary kiln by a preheater, removing dust, purifying, subjecting purified hot gas to oxygen content detection by an oxygen detector, and entering a second step when oxygen content is lower than a preset value; allowing an alarm to warn when the oxygen content reaches the preset value, and automatically supplying and adding nitrogen till the oxygen content is lower than a preset value; secondly, supplying the hot gas to a drying coal mill system, and feeding pulverized coal into a pulverized coal bunker; thirdly, conveying the pulverized coal to a rotary kiln combustion system through a special pipeline to allow waste heat utilization. According to the process, waste heat utilization and waste gas treatment are combined, the online real-time detection and alarm device is added, waste heat, waste gas and oxygen content used by the system are detected continuously online, low-oxygen operation is guaranteed, and the system is safeguarded.

Description

technical field [0001] The invention is mainly applied in the field of waste heat recovery or utilization in the lime production industry, and in particular relates to a process for utilizing the waste heat of a rotary kiln. Background technique [0002] Carrying out comprehensive utilization of waste heat recovery and developing circular economy is in line with the national industrial policy, which is conducive to promoting energy conservation and emission reduction, improving the economic benefits of enterprises, and improving the environment. Rotary kiln production technology mainly through CaCO 2 Thermal decomposition releases CO 2 The final product is industrial active lime, chemical formula: CaO, and the production process consumes a lot of heat energy. At the same time, due to the limitations of the current production technology, the heat utilization efficiency is not high, and a large amount of waste heat resources are wasted. Moreover, although there are various ...

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Problems solved by technology

At the same time, due to the limitations of the current production technology, the heat utilization efficiency is not high, and a large amount of waste heat resources are wasted

Moreover, although there are various approaches and methods for utilizing waste heat resources, the level and capacity of utilization are generally low due to scale constraints.

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