Carbon dioxide heat pump sludge drying system

Abstract

The invention discloses a carbon dioxide heat pump sludge drying system, which comprises: a sludge drying unit, which is used for drying sludge to obtain dried sludge and wet and hot air; a carbon dioxide heat pump unit, which is used for enabling the damp and hot air flowing into the carbon dioxide heat pump unit from the sludge drying unit to form dry high-temperature air and then returning the dry high-temperature air to the sludge drying unit, wherein the dried high-temperature air is used as a heat source for drying the sludge. By using the supercritical CO2 heat pump unit, the exhaust temperature of a compressor is high, CO2 latent heat is high, and condensation is avoided, so that the temperature of a hot air outlet can reach 100 DEG C or above, and the drying efficiency is greatly improved.

Description

technical field

[0001] The invention belongs to the technical field of sludge treatment, in particular to a carbon dioxide heat pump sludge drying system. Background technique

[0002] Sewage treatment will produce a large amount of sludge, which is toxic and contains a large amount of organic matter. How to treat this sludge in a harmless manner has become an important issue in our country today. The existing sludge treatment methods are mainly landfill and pollution-free incineration after drying. Disposing of sludge by landfill not only wastes land resources but also causes secondary pollution to the environment. Therefore, harmless incineration of sludge is currently the most effective way of sludge treatment. Before incineration, the sludge is generally pre-dried to reduce the water content to a certain range, so as to improve the combustion conditions and achieve the purpose of harmless incineration. On the other hand, for enterprises, sludge is a hazardous waste, c...

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