The mine exhaust heat utilization device - exhaust heat extraction box involves the recovery and utilization of exhaust heat generated in the mine. Let me explain some of the terms for you:

1. Mine ventilation deficiency: During the mining process, due to factors such as mining machinery, ventilation equipment, and staff activities, a large amount of waste heat is generated in the mine, known as ventilation deficiency. This type of heat is usually emitted into the environment, causing energy waste.

2. Waste heat utilization device: This refers to equipment used to recover waste heat (waste heat) generated in industrial processes. Through these devices, waste heat can be captured, recovered, and utilized for other purposes, thereby improving energy efficiency.

3. Waste air heat recovery box: A waste air heat recovery box refers to a device used to recover waste heat from mine waste air, usually including a heat exchange system. Through this system, the heat energy in the waste air can be transferred to other fluid media (such as water or air), thereby converting waste heat into useful energy or heat.

The working principle of the exhaust heat exchanger is similar to that of a heat exchanger, where the exhaust air comes into contact with the transfer medium (usually water or air) through a heat exchange surface, allowing the medium to absorb heat from the exhaust air. These devices can be used for various applications such as heating, hot water production, steam generation, etc., thereby reducing energy waste and environmental impact.

In summary, the "Mine Waste Heat Utilization Device - Waste Heat Extraction Box" describes an equipment used to recover heat energy from mine waste air, in order to reduce energy waste and improve energy utilization efficiency.