Sludge heat drying type evaporation energy-saving system

Abstract

A sludge heat drying type evaporation energy-saving system comprises a power steam system and a steam heating type sludge dryer system. The steam heating type sludge dryer system is connected with a water-containing sludge conveying pipeline and a dried sludge conveying pipeline and comprises a primary drying machine and a secondary drying machine in series operation. A heating steam pipeline of the primary drying machine is connected with a steam pipeline of the power steam system, a flash evaporation steam pipeline of the primary drying machine is connected into a steam heat energy recoveryand purification unit, and the steam heat energy recovery and purification unit promotes steam quality and outputs clean steam. A steam output pipe of the steam heat energy recovery and purification unit is connected to a heating steam pipeline of the secondary drying machine. The system has advantages that high-parameter power steam consumption is reduced, boiler coal consumption is reduced, andsludge drying energy consumption and cost are reduced.

Description

Technical field [0001] The invention belongs to the field of water treatment and relates to an evaporation energy-saving system for thermal drying of sludge. Background technique [0002] The principle and requirement of sludge treatment in my country is to realize "reduction, stabilization, harmlessness and resource utilization". The moisture content of the sludge dewatered by the thickening machinery of the sewage treatment plant is about 80%, but the moisture content is still high for subsequent transportation, transfer, treatment and disposal. The volume and weight of the sludge are still large, and it is used for incineration, The moisture content of the composted sludge is required to be less than about 60%, and the moisture content of the sludge at this time is obviously not up to the requirement. Sludge drying can reduce the moisture content of the sludge to 30%-50%, and the remaining substances after drying are relatively stable, the odor and pathogenic organisms are gr...

AI Technical Summary

Problems solved by technology

[0004] The moisture evaporated from the steam sludge dryer belongs to low-pressure saturated flash steam, with a pressure of about 15kPa.a and an enthalpy of about 2200kJ / kg. The latent heat of vaporization is still relatively large, and no recycling is implemented.

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