Large-temperature-difference wellhead heater and operation mode thereof

Abstract

The invention relates to a large-temperature-difference wellhead heater which comprises a low-temperature heat source unit and a shaft air-inlet heating unit. The low-temperature heat source unit directly extracts a low-temperature heat source in coal mine return air through a heat absorber and provides the heat source for a preheating section of the shaft air-inlet heating unit. The air-inlet heating unit has two heating modes including preheating and reheating. Filtered shaft inlet air exchanges heat with a preheater arranged in the preheating section for temperature rise, then enters a reheater to be heated to an inlet air temperature as needed and is further sent to a downcast heapstead after being damped and denoised. The large-temperature-difference wellhead heater is applicable to freezing resistance of coal mine shafts in cold areas, and waste heat of the coal mine return air is utilized to guarantee freezing-resistant needs of shafts so as to achieve energy-saving and emission-reducing effects.

Description

technical field [0001] The invention relates to a wellhead heater, in particular to a device which utilizes a low-temperature heat source to insulate a wellbore in cold regions to achieve the antifreeze effect of the wellbore. Background technique [0002] According to Article 102 of the "Coal Mine Safety Regulations": "The air temperature (dry bulb temperature) below the air inlet shaft must be above 2°C." However, in winter in most parts of the north, the fresh air temperature is much lower than this requirement. In order to meet the regulations and ensure the normal operation of the production work, it is generally necessary to heat the mine intake air. The traditional practice is to provide heat source through coal-fired boilers to meet the above requirements. In this way, not only consume a large amount of coal, but also emit a large amount of pollutants during coal combustion, which can easily cause environmental pollution. [0003] After the fresh air from the grou...

AI Technical Summary

Problems solved by technology

At present, the existing technology recovers mine return air heat energy for shaft antifreeze. The heat source is generally a third-party wall heat exchange, so the loss of heat energy is inevitable and the heat exchange efficiency is reduced.

[0005] In addition, some mines in the northern part of my country are built in high-altitude mountainous areas. The winter climate is extremely cold, far away from the industrial square, and centralized heating is difficult. , cannot meet the requirements of the "Coal Mine Safety Regulations", and there are problems such as system pipeline freezing

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