Coal gangue power generation and CO2 mineralization collaborative utilization system and working method

Abstract

The invention discloses a coal gangue power generation and CO2 mineralization cooperative utilization system and a working method thereof, and belongs to the technical field of solid waste resource utilization. Comprising a coal bunker, a coal preparation unit, a boiler unit, a power generation unit, a denitration unit, a dust removal unit, a desulfurization unit, a mineralization unit, a fly ash drying unit, a cooling tower, a chimney and a sewage treatment unit. A coal preparation unit and a sewage treatment unit are improved on the basis of an existing coal gangue blending combustion coal-fired power generation system, a mineralization unit and a fly ash drying unit are added, the system can fix part of CO2 in flue gas through the mineralization process of the mineralization unit, and emission reduction of CO2 is achieved; meanwhile, CaO and MgO in the fly ash can be converted into CaCO3 and MgCO3 in the mineralization process, the application field of the solid waste fly ash is widened, and the utilization rate of the fly ash is increased. According to the invention, the utilization of coal gangue solid wastes and the reduction of CO2 emission can be realized; meanwhile, the content of CaO and MgO in the fly ash can be reduced, and the application of the fly ash in the field of building material manufacturing is improved.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource utilization, and in particular relates to a coal gangue power generation and CO 2 Mineralization synergistic utilization system and working method. Background technique [0002] In the process of coal mining and washing, a large amount of coal gangue will be produced, and hundreds of millions of tons of coal gangue will be produced every year, but the utilization rate of coal gangue is less than 30%, resulting in serious waste of resources. On the one hand, it occupies a lot of land resources, and on the other hand, it also causes certain environmental pollution. Therefore, improving the utilization rate of coal gangue and eliminating its negative impact has important economic and environmental benefits. [0003] With the continuous development of the global economy, CO from human activities 2 Emissions are rising year by year, and by 2020, the global atmospheric CO 2 The average ...

AI Technical Summary

Problems solved by technology

[0002] A large amount of coal gangue will be produced in the process of coal mining and washing, and hundreds of millions of tons of gangue will be produced every year, but the utilization rate of coal gangue is less than 30%, resulting in a serious waste of resources. At the same time, a large amount of coal gangue can only be stacked , landfill and other methods of disposal, on the one hand occupy a large amount of land resources, on the other hand also caused a certain degree of environmental pollution

However, due to the large amount of ash contained in coal gangue, the content of CaO and MgO in some produced gangue is more than 10%, which belongs to calcium-magnesium type coal gangue, and a large amount of fly ash will be produced after blending, which is also difficult to dispose of; meanwhile, coal-fired power generation is also the most major CO 2 One of the sources of emissions that does not meet carbon reduction expectations

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