Parallel sludge low-temperature drying system utilizing waste heat of flue gas

Abstract

The invention discloses a parallel sludge low-temperature drying system utilizing waste heat of flue gas. The parallel sludge low-temperature drying system comprises a sludge hopper of a double-screw quantitative sludge inlet device, a separator, a first screw conveyor, a second screw conveyor, a first sludge drying granulating apparatus, a second sludge drying granulating apparatus, a totally-closed belt conveyor, a sludge finished product warehouse, a first ventilating pipe, a bio-filter, a second ventilating pipe, an air door, a heat supply source, a third ventilating pipe, an electric dust collector or a bad dust collector, a fourth ventilating pipe, a fifth ventilating pipe, a chimney, a sixth ventilating pipe, a multicyclone, a water curtain dust removal desulphurization unit, a circulating water sedimentation tank, an agent box, a seventh ventilating pipe, a fan, an eighth ventilating pipe, a ninth ventilating pipe and the like. According to the invention, the waste heat of the flue gas is utilized to carry out sludge low-temperature drying, so that water in sludge is evaporated without destroying organisms, and not only over 95 percent of sludge original calorific value is kept, but also discharge of harmful gas is controlled from the source.

Description

technical field [0001] The invention relates to a parallel sludge low-temperature drying system utilizing waste heat of flue gas. Background technique [0002] By 2010, my country's urban sewage treatment rate will not be lower than 70%. By the end of June 2012, the national urban sewage treatment volume has reached 139 million cubic meters per day. During the purification process of urban domestic sewage and industrial wastewater, a large amount of sludge will be produced. The amount of sludge produced in my country has reached 34.8 million tons per year, and it is increasing at a growth rate of 10-15% every year. In addition, the amount of polluted river and lake dredging sludge and urban sewer sludge produced every year is also very large. These municipal sludges are composed of complex heterogeneous bodies such as organic debris, bacterial cells, inorganic particles, and colloids. They are a solid-liquid mixture containing pathogenic microorganisms, various organic and i...

AI Technical Summary

Problems solved by technology

However, thermal drying of sludge is a process of net energy consumption, and energy consumption usually accounts for more than 80% of the total cost of sludge treatment, thus forming an "energy consumption bottleneck"

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