A comprehensive energy supply system for wide-concentration gas recovery in coal mines and its operation method

Abstract

The invention discloses an integrated energy supply system for recovering wide concentration gas of coal mine and an operating method thereof. The integrated energy supply system for recovering the wide concentration gas of the coal mine is characterized by comprising a mixing device, a heat storage oxidizing device, a wet material drying device, a dust removal device, an internal combustion engine, an electric generator, a flue gas type refrigerator, a waste heat boiler, a deaerator, an absorption type heat pump, a steam heat exchanger and a steam type refrigerator; the flue gas at differenttemperatures produced by the internal combustion engine and the heat storage oxidizing device enters the waste heat boiler to produce superheated steam to drive each of a pure condensate steam turbineand a back pressure steam turbine to do work and generate electricity; different refrigerators are driven to refrigerate by utilizing the flue gas produced by the internal combustion engine and the exhaust steam of a pressure turbine; the requirements of a coal mine user are met by producing domestic hot water by utilizing low temperature waste heat resources; and meanwhile, heat is supplied to the coal mine user by combining the steam heat exchanger. According to the integrated energy supply system for recovering the wide concentration gas of the coal mine and the operating method thereof, gradient deep utilization of heat energy of high-temperature flue gas of the heat storage oxidizing device and medium-high-temperature flue gas in the internal combustion engine is realized; and the requirements of energy utilization of heat, electricity, cold and the like of different users of the coal mine are met.

Description

technical field [0001] The invention belongs to the fields of utilization of low-concentration gas in coal mines and recovery and utilization of waste heat, and in particular relates to a comprehensive energy supply system for recovering wide-concentration gas in coal mines and an operating method thereof. Background technique [0002] Gas is the main greenhouse gas second only to carbon dioxide, and the greenhouse effect produced by a unit mass of gas is equivalent to 21 times that of the same mass of carbon dioxide. During the mining of coal, a large amount of gas is often associated with it. This is one of the main sources of gas industry emissions. Reducing gas emissions from coal mines can effectively reduce greenhouse gas emissions. At the same time, the main component of coal mine gas is methane, which is a high-quality and clean gas energy source. [0003] my country is a big energy consumer. In 2017, China's energy output was 3.59 billion tons of standard coal. In...

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Problems solved by technology

The technical limitations of this patent mainly include: the high-temperature flue gas temperature generated by the direct use of the oxidation device is too high, and a certain amount of high-grade energy is wasted due to the driving of the flue gas-type absorption refrigeration unit; the exhaust heat of the waste heat boiler has not been fully recovered; Exhaust steam is discharged directly and is wasted; steam drainage waste heat after steam extraction and heat exchange for heat supply has not been recycled

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