Low-calorific-value coal steam-hot air combined cycle power generation system

Abstract

The invention discloses a steam-hot air combined cycle power generation system belonging to the technical field of low-calorific-value coal power generation. The system comprises an oxygen-enriched flameless combustion circulating fluidized bed boiler system, a steam cycle power generation system, a hot air cycle power generation system and a pollutant removing system, wherein the circulating fluidized bed boiler system produces high-temperature and high-pressure steam by means of low-calorific-value coal through high-temperature flue gas combined with the oxygen-enriched combustion technology to push a steam turbine to generate electricity; in the hot air cycle power generation system, air and coal mine ventilation air containing the low concentration of methane are compressed and heated and then are subjected to an oxidizing reaction in a high-temperature methane oxygenizer; produced high-temperature and high-pressure hot air is used for pushing an air turbine to do work. The steam-hot air combined cycle power generation system integrates steam cycle power generation and hot air cycle power generation, the utilization rate of the low-calorific-value coal can be increased, pollutants are reduced, the low-concentration methane in the coal mine ventilation air can also be effectively oxidized and eliminated, the greenhouse gas effect of the low-concentration methane is reduced, and the energy source, namely the low-concentration methane, can be fully utilized while the low-concentration methane is prevented from polluting the environment.

Description

technical field [0001] The invention belongs to the field of low-calorific-value coal power generation and efficient recovery and utilization of low-concentration methane coal well ventilation, and particularly relates to a low-calorific-value coal steam-hot air combined cycle power generation system, specifically a coal well ventilation that can recover low methane concentration Low calorific value coal steam-hot air combined cycle power generation system. Background technique [0002] In recent years, with the deterioration of the global ecological environment and the acceleration of energy consumption, "energy saving and emission reduction" has begun to receive more and more attention. my country's primary energy is dominated by coal, and the proportion of coal in my country's primary energy consumption has been around 70% for a long time. In my country's coal resources, low calorific value coal represented by lignite / sub-bituminous coal accounts for more than 55%, with ...

AI Technical Summary

Problems solved by technology

At present, almost all ultra-low-concentration coalbed methane in the world is directly discharged into the atmosphere without recycling treatment. On the one hand, this has caused a serious waste of limited non-renewable resources, and on the other hand, it has also exacerbated air pollution and the greenhouse effect.

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