Waste heat stairstep recycling system and method for electrolytic aluminum plant

Abstract

The invention discloses a waste heat stairstep recycling system and method for an electrolytic aluminum plant. The waste heat stairstep recycling system for the electrolytic aluminum plant comprises awater source heat pump, a high-temperature compressed air heat exchanger, a high-temperature oil heat exchanger and a high-temperature smoke heat exchanger, wherein the water source heat pump, the high-temperature compressed air heat exchanger, the high-temperature oil heat exchanger and the high-temperature smoke heat exchanger are sequentially connected in series through a pipeline. The water source heat pump inputs normal-temperature tap water through a water pump. An outlet of the high-temperature smoke heat exchanger is connected to a water storage tank in an output manner. The water source heat pump and a cooling water system of an air compressor of the electrolytic aluminum plant conduct heat exchange connection. The high-temperature compressed air heat exchanger and a high-temperature compressed air pipeline of an air compression machine room conduct heat exchange connection. The high-temperature oil heat exchanger and a high-temperature oil pipeline of a drying machine room conduct heat exchange connection. The high-temperature smoke heat exchanger and a high-temperature smoke pipeline of a carbon branch heating medium furnace conduct heat exchange connection. A heat stairstep concentration and recycling method is adopted, various waste heat resources of the electrolytic aluminum plant are concentrated and recycled to the maximum extent, the heat recycling effect is good, the electrolytic aluminum plant achieves self-sufficiency of heating and domestic hot water, the energy consumption is lowered, and the water resource can be saved.

Description

technical field [0001] The invention belongs to waste heat recovery technology, in particular to a waste heat cascade recovery system and recovery method in an electrolytic aluminum plant. Background technique [0002] The waste heat in the industrial production process refers to the sensible heat and latent heat that have not been rationally utilized in the original design in the energy-consuming devices of industrial enterprises that have been put into operation due to the limitations of history, technology, ideas and other factors. It includes waste heat of high-temperature exhaust gas, waste heat of cooling medium, waste heat of waste steam and waste water, waste heat of high-temperature products and slag, waste heat of chemical reaction, waste heat of combustible waste gas and liquid, waste heat, etc. According to the survey, the total waste heat resources of the electrolytic aluminum plant account for about 17% to 67% of its total fuel consumption, and the recyclable w...

AI Technical Summary

Problems solved by technology

But at present, most of the waste heat is cooled or directly discharged, or the high-grade waste heat of a single equipment is recycled and reused, resulting in a large part of low-grade heat energy being wasted, and other places that need heat have to consume fuel through boilers to heat

In the existing technology, in the industrial energy saving and environmental protection, the energy consumption per unit of product is reduced, especially the system waste heat recovery and utilization technology of the electrolytic aluminum production line is rarely reported

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