Mine return air waste heat gradient utilization system

Abstract

The invention provides a mine return air waste heat gradient utilization system, and relates to the technical field of shaft freezing preventing and heating. The mine return air waste heat gradient utilization system comprises a return air system, a wellhead heater assembly, a downhole air inlet mechanism and a heat pump unit; gradient utilization is carried out on return air waste heat of a mine,the return air system and the heat pump unit jointly heat the wellhead heater assembly, and the wellhead heater assembly can heat the outdoor air temperature at a wellhead of the downhole air inlet mechanism; through gradient utilization of the waste heat, the operating cost for shaft freezing preventing in winter can be reduced, the condition that a large amount of energy needs to be consumed due to a heat pump technology in the prior art is alleviated, the applicability of mine return air is low, and the technical problem that the mine ventilation safety hazard is affected is solved; and the comprehensive energy efficiency ratio is greatly improved, a large amount of energy can be saved, the comprehensive operation cost is low, the pollution to the environment is effectively reduced, and the economic and social benefits after use and promotion are outstanding.

Description

technical field [0001] The invention relates to the technical field of shaft antifreeze heating, in particular to a cascaded utilization system for mine return air waste heat. Background technique [0002] At present, mine return air waste heat utilization technology mainly has two utilization methods: 1. Use heat pump technology to extract heat from mine return air to produce hot water at 45-60°C for shaft antifreeze; 2. Use mine return air to directly heat fresh air to Above 2°C, it is sent to the air inlet wellhead through a large-diameter air duct to prevent freezing of the wellbore. [0003] In the prior art, extraction by heat pump technology consumes a large amount of electric energy as driving energy, and the average energy efficiency ratio of the system is about 3, that is, to produce 3kW of heat energy, it needs to consume 1kW of electric energy to extract about 2kW of heat energy from the mine return air for heating. [0004] In the prior art, the system that use...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a cascade utilization system for mine return air waste heat, so as to alleviate the technical problems that the heat pump technology in the prior art needs to consume a large amount of electric energy, and the utilization of mine return air has low applicability and has potential safety hazards affecting mine ventilation. at least one of

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