Wet sewage sludge drying method and fluidized bed dryer

Abstract

The invention provides a wet sewage sludge drying method and a fluidized bed dryer, mainly solves the problem in the prior art that accidents occur because selected high-temperature particles have high probability of combustion, and meanwhile, solves the problem of nonstandard sewage sludge drying if medium-temperature particles are adopted under the technical scheme framework provided by the prior art. The wet sewage sludge drying method and the fluidized bed dryer can adopt a medium-temperature solid particle heat carrier to perform drying, so that the incidence of an operation safety accident is reduced to 0, and the security of wet sewage sludge drying is greatly improved. Meanwhile, the wet sewage sludge drying method and the fluidized bed dryer properly avoids the contradiction that the medium-temperature particles and dry sewage sludge are combustible, the particle flow is large, however, the material level difference between a feed opening and a discharge opening cannot be too much, and the fluidizing gas volume cannot be too high.

Description

technical field [0001] The invention relates to a method for drying wet sludge and a fluidized bed dryer, in particular to a method for drying wet sludge using medium-temperature particles and a parallel multi-channel medium-temperature particle heat carrier sludge fluidized bed dryer . Background technique [0002] The sludge fluidized bed dryer using solid particles as the heat carrier has many advantages compared with the sludge fluidized bed dryer using heat transfer oil and steam as the heat carrier, but a good granular heat carrier sludge fluidized bed Dryers need to match the characteristics of sludge, granules and fluidized beds. [0003] Patent CN203007102U provides a granular heat carrier sludge fluidized bed dryer, in addition to adopting the dense phase area, settling section and air distribution device commonly used in fluidized bed equipment, its basic features are: 600-1000 ℃ high temperature particles , a single feeding point; the longitudinal section along...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for drying wet sludge and a fluidized bed dryer, which mainly solves the problem that the high-temperature particles used in the prior art are prone to combustion and cause accidents; at the same time, if the technical solution framework provided by the prior art If medium temperature particles are used under low conditions, it will lead to the problem that the sludge drying does not meet the standard

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