Energy-saving sludge drying process and device

Abstract

Provided is an energy-saving sludge drying method. A sludge preheater, an indirect heating sludge dryer, a cyclone dust collector, a waste gas condenser and a waste gas draught fan are adopted. Steam is conveyed into the indirect heating sludge dryer (2) through a pipeline, steam condensate generated after the steam releases heat in the indirect heating sludge dryer contains excess heat, the steam condensate is conveyed into the sludge preheater (1) through a pipeline, the excess heat is released again, and sludge to be dried is preheated with the excess heat. The wet sludge is conveyed into the sludge preheater (1) through a pipeline and preheated through the sludge preheater, and the temperature of the sludge rises to 50 DEG C or above; the sludge is heated in the indirect heating sludge dryer (2), and moisture and other volatilizable components in the sludge are heated and generate gas. A material accumulation hopper is arranged below the cyclone dust collector, the hopper and a dust collector body are provided with normally open isolation valves, an outlet in the lower portion is provided with a normally closed sewage discharge isolation valve, the volume of the waste gas is reduced after the waste gas is changed into a liquid state from a gaseous state, and then the waste gas is discharged through the waste gas draught fan.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, and in particular relates to an energy-saving sludge drying process and device. Background technique [0002] With the development of the economy and the improvement of people's living standards, the process of urbanization is accelerating, the amount of industrial sewage and domestic sewage is increasing, and the amount of sludge generated is also increasing. At the same time, my country's industrial field is developing rapidly. The sludge discharge of pharmaceutical and chemical enterprises is increasing rapidly, and the resulting environmental pollution is becoming more and more serious. For this reason, the state strongly supports sludge reduction and incineration technology, among which drying technology has been greatly developed and applied. [0003] At present, sludge drying treatment methods and devices mainly include rotary kiln hot air drying, belt hot air drying, fluidized be...

AI Technical Summary

Problems solved by technology

[0003] At present, sludge drying treatment methods and devices mainly include rotary kiln hot air drying, belt hot air drying, fluidized bed hot air drying, and paddle drying, but these traditional processes consume a lot of heat energy and are relatively poor in technology and economy.

Does not meet the requirements of the national energy conservation and emission reduction policies and guidelines

Especially for drying systems that use steam as a heat source, the temperature of the condensed water after the steam releases heat is 95-100°C. Whether the condensed water is discharged or recycled, the temperature must be lowered to below 45°C. It also needs cooling water all the way for cooling, thus causing repeated waste of energy

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