Method for drying sludge by blade drier

Abstract

The invention provides a sludge paddle desiccation method, which comprises the following steps: loading wet sludge into a paddle desiccator with a charger, indirectly heating materials through a hollow blade heating shafts and a shell jacket with thermal medium, the heating shafts intermeshied and rotating, with squeezing and relaxation alternative action, materials dried and moving to a discharge door simultaneity. The wet share evaporated in drying process is carried and discharged with carrying gas, and the carrying gas can enter from a carrying gas inlet or the discharge door, and is ejected from exhaust outlet. The heating shafts of the desiccator can be two shafts, or four shafts. The wet share discharged from the desiccator is washed, dedusted and deodorizated with a washing tower to reach the emission standard, and evacuation with a induced fan. The invention has the characters such as small energy consumption, low operating cost, small equipment plot area and equipment investment, big operating flexibility, stable and reliable operation, little entrained dust and material depletion. The invention settles the technical roadblock of huge dedusting equipment, high operating cost of hot-air sludge desiccator or short periodic motion caused by frequently sticking wall in other sludge desiccation. The invention not only make drying in allusion to the characters of high moisture content and high viscosity of sludge, but also is suitable to dry industrial sludge such as oil sludge, catalytic sludge, chemical sludge, biochemistry sludge, and domestic sludge.

Description

technical field [0001] The invention relates to the technical field of sludge drying (drying), and is a paddle dryer for urban domestic sludge and industrial sludge (including various oil sludge, catalytic sludge, chemical sludge, biochemical sludge, etc.) chemical (drying) method. Background technique [0002] The industry generally refers to the drying of municipal domestic sludge and industrial sludge as drying. At present, the drying of sludge at home and abroad mostly uses drum dryers, disc dryers, fluidized bed dryers or other airflow dryers. Due to the high water content of the sludge (generally greater than 50%, up to 90%) and high viscosity, the sludge often sticks to the wall during production with the above-mentioned dryer, which makes it difficult for the equipment to run for a long period. Among them, the use of fluidized bed drying requires a layer of dry material to be laid on the bed before drying, and the use effect is not ideal; hot air drying consumes a ...

AI Technical Summary

Problems solved by technology

Due to the high water content of the sludge (generally greater than 50%, up to 90%) and high viscosity, the sludge often sticks to the wall during production with the above dryer, which makes it difficult for the equipment to operate for a long period of time.

Among them, the use of fluidized bed drying requires a layer of dry material to be laid on the bed before drying, and the use effect is not ideal; hot air drying consumes a lot of energy, and produces a large amount of waste gas after drying, and the tail gas treatment system is very large. And prone to secondary pollution

Images