System for vacuum drying sludge by adopting solar energy

Abstract

The invention relates to a system for vacuum drying sludge by adopting solar energy, comprising a self-cleaning sludge continuous vacuum drier with inclined two blades, a solar thermal collector, a heat conducting oil tank and a heat conducting oil pump. A cylindrical vacuum casing of the drier is internally provided with a vacuum thermal axis connected to a gearing. The vacuum thermal axis is provided with multiple sets of blades which are arranged in the inclined double blades manner. Both heat conducting oil outlets of the vacuum thermal axis and the casing are connected to the heat conducting oil tank through pipelines. Both heat conducting oil inlets and the outlets of the vacuum thermal axis and the casing are connected to the solar thermal collector through the pipelines. The heat conducting oil tank and the heat conducting oil pump are connected to the solar thermal collector through the pipelines. The invention realizes the drying of the sludge by adopting the solar energy, greatly reduces energy consumption during the sludge drying and saves energy by utilizing the self-cleaning vacuum sludge drier with inclined double blades.

Description

technical field [0001] The invention relates to the technical field of harmless and resourceful treatment of solid waste, in particular to a system for vacuum drying sludge by using solar energy. Background technique [0002] With the acceleration of my country's urbanization process and the strengthening of urban infrastructure construction, the urban sewage treatment rate has gradually increased, accompanied by a large amount of excess sludge. If these sludges cannot be treated in a timely, effective and stable manner, it will bring great hidden dangers to the safety of our regional environment and people's lives. In addition, industrial processes such as papermaking, chemical industry, tanning, printing and dyeing, and dredging of rivers and lakes will also produce a large amount of sludge. The harmless treatment of sludge has become a major environmental protection problem that must be solved in the process of urban scientific development. [0003] The moisture content...

AI Technical Summary

Problems solved by technology

[0004] Existing thermal sludge drying technology requires heat sources for drying wet sludge mainly from waste heat of boiler flue gas, direct heating and drying with auxiliary fuel or electric energy, or low-grade steam (such as steam after steam turbine has done work), using boiler waste heat Flue gas drying needs to be equipped with tail gas treatment devices; and using auxiliary fuel or electric energy to heat and dry will consume a lot of energy, so the overall cost of the above heat source supply methods is relatively high

In addition, the existing technology of using solar energy to dry sludge generally adopts the solar greenhouse drying method, but the cycle of drying sludge in a greenhouse is very long, and it usually takes more than a week to achieve the purpose of sludge drying, and the greenhouse drying covers an area of Large, the construction cost of the greenhouse is relatively high

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