Method and system for comprehensively utilizing biomass ash

Abstract

The invention discloses a method and a system for comprehensively utilizing biomass ash. The method comprises the following steps: reacting biomass ash with acid, and extracting elements including potassium, phosphorus, silicon, calcium and magnesium and the like from the biomass ash to prepare a potassium-based compound fertilizer; reacting residual biomass ash left after the acid reaction with alkali, and extracting a silicon element from the biomass ash to prepare an inorganic silicon compound; and performing a reactivating reaction on the residual biomass ash left after the acid-alkali reaction to prepare active carbon, wherein the sequences of the acid reaction and the alkali reaction can be changed according to different types of biomass ash. According to the method, deep processing of biomass ash is performed with a simple process at low production cost, and the obtained high-quality potassium-based compound fertilizers, relevant inorganic silicon compounds and active carbon products are free from residual ash, so that the comprehensive utilization of the biomass ash is utilized, the problem of treatment of the biomass ash is solved, the additional value of the biomass ash is increased greatly, and the industrialization and sustainable development of biomass energy is facilitated.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of residual ash after biomass energy utilization, and in particular to a method for respectively participating in acid reaction, alkali reaction and revitalization reaction of biomass ash to benefit the beneficial components in biomass ash. A method and system for comprehensive extraction and comprehensive utilization. Background technique [0002] With the increasingly severe situation of energy and environmental protection, biomass energy is in the ascendant, and the common forms of biomass energy utilization include direct combustion, pyrolysis gasification and so on. There are many types of biomass, such as various straws, forestry and wood industry residues, bamboo and bamboo processing industry residues, rice husks, various fruit shells, bagasse, corncobs and other biomass that will be left after energy utilization. A certain amount of ash, the quality of ash usually accou...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method and system for the comprehensive utilization of biomass ash, which reacts the biomass ash with acid and alkali respectively, and then performs the revitalization reaction to comprehensively utilize the ash and slag. Digesting biomass ash not only solves the whereabouts of biomass ash, but also greatly increases the added value of biomass ash, and promotes the industrialization and sustainable development of biomass energy

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