System and method for preparing filling paste based on magnesium slag/fly ash coupled flue gas desulfurization and carbon reduction treatment

Abstract

A system for preparing filling paste based on magnesium slag / fly ash coupling flue gas desulfurization and carbon reduction treatment comprises: a flue gas desulfurization reactor, wherein the bottom of the flue gas desulfurization reactor is provided with a desulfurization slurry collection pool, the top of the flue gas desulfurization reactor is provided with a flue gas outlet, an absorption slurry distribution device is arranged below the flue gas outlet, a flue gas inlet is located above the desulfurization slurry collection pool and below the absorption slurry distribution device, and the flue gas inlet is connected with the flue gas discharge port of a coal-fired boiler dust remover; an absorption slurry preparation device used for preparing absorption slurry by utilizing magnesium slag and / or fly ash raw materials, wherein the absorption slurry is conveyed to the absorption slurry distribution device, and the absorption slurry is in contact with boiler flue gas to realize flue gas desulfurization and carbon reduction and is converted into desulfurization slurry which falls into the desulfurization slurry collection pool; a slurry concentration pool connected with the desulfurized slurry collection pool and used for reducing the water content of the desulfurized slurry to obtain concentrated slurry meeting the preparation requirements of the filling paste; and a filling paste preparation system used for preparing filling paste by using the concentrated slurry.

Description

technical field [0001] The invention belongs to the technical field of resource recycling of bulk industrial solid waste, and in particular relates to a system and method for preparing filling paste based on magnesium slag / fly ash coupled flue gas desulfurization and carbon reduction treatment. Background technique [0002] There are two types of coal mining: conventional mining and green filling mining. In conventional mining, there are common mechanized coal mining technology, comprehensive mechanized coal mining technology, blasting coal mining technology and so on. These mining methods have large output and high recovery rate, but in the process of mining, they will cause problems such as ground subsidence (collapse), ecological environment damage, and building (structure) damage. Filling mining is a green mining technology that is expected to break through the current conventional coal mining problems. [0003] According to the current standard of green coal mining, c...

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Problems solved by technology

[0005] Although the limestone-gypsum wet desulfurization process is mature and widely used, there are still some problems: In the operating cost of limestone-gypsum wet flue gas desulfurization, the cost of electricity and desulfurization absorbent (limestone) accounts for a large proportion, exceeding the total operating cost of the desulfurization system 90% of

In addition, limestone mining has caused serious damage to the ecological environment of the mining area. The amount of gypsum produced by this method is relatively large, and resource utilization is limited. At present, a large proportion of desulfurized gypsum produced is disposed of as waste. This problem needs to be solved urgently

[0006] Therefore, at this stage, the coal-electricity integration project is facing three major problems: First, in order to improve the resource recovery rate and coal mining rate, coal mines use fully-mechanized coal mining to cause ground subsidence (collapse) in the mining area, damage to the ecological environment, and construction. (Structure) damage to buildings; secondly, when the mined coal is transformed into resources such as power generation, coal chemical industry, and magnesium smelting or deep-processed, the large industrial solid wastes such as fly ash, slag, magnesium slag, and gasification slag are produced. Proper disposal issues; third, the current air pollutant emissions require that the flue gas emissions of coal-fired boilers have low emissions, the limestone consumption of wet desulfurization, and the disposal of by-product desulfurization gypsum

However, under the current process system in which the steps of "coal mining-deep processing-waste treatment" are separated, it is difficult to properly solve the above problems

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