Method for making biological coal by reaction of fly ash and municipal sludge

Abstract

The invention discloses a method for making biological coal by the reaction of fly ash and municipal sludge, comprising the following steps of: firstly determining water content of the municipal sludge in pipelines by utilizing a computer system, and adding the fly ash to municipal sludge pipelines through fly ash pipelines according to the determined water content to make the fly ash mix with the municipal sludge to react and absorb water, wherein the water content of the mixture after the reaction at the discharge opening is 1-5%; and then adding a liquid deodorizer to the mixture and mixing in an agitator tank, wherein the water content of the mixed municipal sludge is 8-10%; finally making grains with different gradations by a pelletizer. The weight percentage of calcium oxide to the fly ash is 15-35%, and the weight percentage of free calcium to the fly ash is 0.2-0.4%. By utilizing the method of the invention, the floor area stacking the fly ash of a power plant is also reduced while the municipal sludge is treated, the volatile matter of the produced biological coal as received basis ranges 27-35%, the low calorific value of the as received basis is 3000-4000 kcal / kg totally similar to that of the coal, and the sustained combustion of the biological coal can be completely realized.

Description

technical field [0001] The invention relates to a method for utilizing fly ash, in particular to a method for generating biocoal by using fly ash to react with urban sludge to absorb water. Background technique [0002] In recent years, with the acceleration of urbanization, the amount of urban sewage treatment has increased significantly. The country's average daily sewage treatment is 53.2 million tons, and it is growing at a rate of 10% per year. Sludge, as a companion to urban sewage treatment, accounts for 1% to 20% of the total sewage. The increasing amount of sludge in sewage is in sharp contradiction with the serious shortage of sludge treatment capacity and the serious backwardness of treatment methods. A large amount of wet sludge is transported out at will, simply landfilled or piled up, resulting in the occurrence of "sludge" in many cities. The city besieged” phenomenon, urban sludge contains a large number of organic pollutants, as well as potentially toxic a...

AI Technical Summary

Problems solved by technology

[0004] Therefore, it has become an important issue to be solved urgently in the sewage treatment industry to seek and explore the harmless and resourceful ways of urban sludge. In the prior art, there is no combined treatment scheme of fly ash and urban sludge.