Magnesium slag waste heat utilization system

Abstract

The invention provides a magnesium slag waste heat utilization system. The magnesium slag waste heat utilization system comprises a heat exchange bin, a first dust remover which communicates with the interior of the heat exchange bin and can remove dust of first airflow flowing out of the heat exchange bin, a heat exchanger and an air entraining device; the heat exchanger comprises a heat exchanger shell and a heat exchange pipeline which is located in the heat exchanger shell and allows combustion-supporting air to circulate, the first airflow flowing out of the first dust remover can exchange heat with the combustion-supporting air, and the combustion-supporting air is conveyed into a Pidgeon furnace after exchanging heat with the first airflow; and the air entraining device can drive the first air to enter the heat exchange bin, sequentially pass through the heat exchange bin, the first dust remover and the heat exchanger and then be discharged into the external environment. According to the system, cold air in the external environment is forcibly introduced into the heat exchange bin by the air entraining device and makes contact with high-temperature magnesium slag in the heat exchange bin for heat exchange to form the high-temperature first airflow, the high-temperature first airflow exchanges heat with the cold combustion-supporting air in the heat exchange pipeline of the heat exchanger, the heated combustion-supporting hot air is introduced into the Pidgeon furnace to achieve combustion supporting of fuel in the furnace, and the purpose of saving coal gas can be achieved.

Description

technical field [0001] The invention belongs to the technical field of magnesium smelting resources and waste heat utilization, and in particular relates to a magnesium slag waste heat utilization system. Background technique [0002] The production of primary magnesium in my country generally adopts the Pidgeon method, which belongs to the thermal reduction method. This process has the advantages of simple technology and low equipment cost, but it has high energy consumption and low heat utilization rate, and at the same time produces a large amount of reduced magnesium. Slag, this kind of reduced magnesium slag is produced along with the magnesium reduction process. Its furnace temperature is high, generally around 1000°C, and contains a lot of heat energy. However, this part of the heat of the magnesium slag is rarely recycled in production. The hot magnesium slag is often used Place it in the air to cool naturally, so that the heat is wasted. The current research on the u...

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Problems solved by technology

[0002] The production of primary magnesium in my country generally adopts the Pidgeon method, which belongs to the thermal reduction method. This process has the advantages of simple technology and low equipment cost, but it has high energy consumption and low heat utilization rate, and at the same time produces a large amount of reduced magnesium. Slag, this kind of reduced magnesium slag is produced along with the magnesium reduction process. Its furnace temperature is high, generally around 1000°C, and contains a lot of heat energy. However, this part of the heat of magnesium slag is rarely recycled in production, and the hot magnesium slag is often used Place it in the air for natural cooling, so that the heat is wasted in vain

The current research on the utilization of magnesium slag is mainly focused on resource utilization, such as: using the cooled magnesium slag to make cement and building bricks, etc.; there are not many studies on the recovery of magnesium slag waste heat, mainly focusing on the application of waste heat boilers to produce steam. Insufficient utilization of waste heat

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