Method and device for high-valued and comprehensive utilization of deinked sludge

Abstract

The invention discloses a method for high-valued and comprehensive utilization of deinked sludge. The method comprises the following steps: pyrogenation: namely, dehydrating, drying and pyrolysing deinked sludge in a spiral pyrolysis reactor, and extruding and crushing pyrolysed residues to obtain fine particles; temperature-controlled combustion: namely, after pyrolytic reaction, transporting the fine particles to a clapboard type fluidized bed and carrying out temperature-controlled combustion under the action of an oxidizer, discharging fully-combusted solid clinkers out of the clapboard type fluidized bed, and lifting a gaseous product produced in the combustion process to the upper end of the clapboard type fluidized bed; smoke gas purification: namely, fully combusting the gaseous product produced by the temperature-controlled combustion under the action of secondary air to form high-temperature smoke, fully decomposing organic pollutants in the smoke under the action of high temperature, discharging a combustion product out of the clapboard type fluidized bed, mixing one part of the high-temperature smoke with air and transmitting the mixed gas to the bottom of the clapboard type fluidized bed serving as primary wind (fluidized wind of the fluidized bed), and transmitting the other part to the spiral pyrolysis reactor as a heating source of the spiral pyrolysis reactor.The method can promote the clean production of pulp and paper-making industry by waste paper and promote the implementation of energy conservation and emission reduction tasks.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method for energy utilization and resource recovery of deinking sludge discharged from the pulp and paper industry and a device thereof. Background technique [0002] The pulp and paper industry is one of the important pillars of the national economy. The shortage of fiber resources, energy consumption and environmental pollution are the main problems facing its sustainable development. All countries in the world attach great importance to the recycling of waste paper resources. In 2007, my country's waste paper pulping has accounted for 57% of the pulp used in papermaking. Waste paper pulping can save natural resources, but when paper mills use waste paper as papermaking raw materials A large amount of waste, that is, deinking sludge, will be generated in the step, causing new environmental pollution. For every ton of absolute dry pulp produced in a typical f...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical problem of low comprehensive utilization rate of the prior art for the treatment method of deinking sludge, and provide a method based on the principle of thermochemical transformation, which combines dry pyrolysis and temperature-controlled combustion, and makes full use of deinking sludge. Energy resources in mud, recovery of inorganic fillers, comprehensive treatment method and device for realizing recycling and utilization of deinking sludge

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