Municipal sludge drying system utilizing power plant waste heat coupling solar energy

Abstract

A municipal sludge drying system utilizing power plant waste heat coupling solar comprises a steam water process, an air flow and a sludge process. The steam water process is as below: a condenser is provided, a water channel inlet is connected with cooling tower (10) circulating water, an outlet path passes through an air-water heat exchanger (9), the other path passes through a sludge heater (1), and the two are finally sent back to the cooling tower (10); and the condenser steam source is from a steam exhaust discharged by a turbine (4). The air process is as below: a blower (8) sends the air to the heat exchanger (9), a solar heat collecting plate (6) and a fluidized bed dryer (2) in order, and the air is finally discharged into the atmosphere through a dust collector (5). The sludge process is as below: sludge disintegrated by a disintegrator is sent into a sludge heater (1), falls into the fluidized bed dryer (2) and is finally transmitted to a bunker (3) by a conveying belt. The system makes full use of waste heat in the power plant and solar energy of the plant area, and improves the thermal economy of the power plant; the sludge is treated by drying technology to achieve stabilization, harmlessness and reduction. The invention lays the foundation for further resource utilization and has important practical significance.

Description

technical field [0001] The invention relates to a system for drying urban sludge by utilizing waste heat of a power station coupled with solar energy. Background technique [0002] With the development of my country's social economy and the increase of urban population, environmental pollution is becoming more and more serious, and people's awareness of protecting and improving the living environment will inevitably lead to more and more wastewater treatment. my country's sewage discharge in 2010 will reach 4.40×10 10 m 3 / d, it is estimated that the sewage discharge in 2020 will reach 5.36×10 10 m 3 / d, so at least 5 million tons of sludge are generated every year. However, practice at home and abroad shows that after the traditional concentration and dehydration process, the water content of the sludge cannot reach below 60%, and after mechanical dehydration, the water content of the sludge is about 75%. To achieve further dehydration of sludge, a more economical meth...

AI Technical Summary

Problems solved by technology

However, practice at home and abroad shows that after the traditional concentration and dehydration process, the water content of the sludge cannot reach below 60%, and after mechanical dehydration, the water content of the sludge is about 75%.

To achieve further dehydration of sludge, a more economical method is to introduce drying techniques commonly used in chemical operations, and these drying techniques will undoubtedly consume huge energy

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