A heat pump sludge dryer with evaporator precooling

Abstract

A Hot pump sludge dryer for pre-cooling an evaporator relates to sludge drying equipment. The problems that inner circulating air of a system cannot be pre-cooled and cooled by utilizing outdoor air in the existing hot pump sludge drying technology so as not to reduce operation energy consumption of the hot pump and improve the dehumidification rate are solved. The dryer comprises a drying chamber, a hot pump system, a heat returner, cooling equipment, an air feeding machine and a condensed water collection and drainage device, wherein an evaporator and a condenser in the hot pump system are positioned in an air circulating pipeline enclosed by the dryer; hot end inlet air of the heat returner is delivered by a filter in the drying chamber; a hot end outlet air of the heat returner is fed to the cooling equipment; cold end inlet air of the heat returner is delivered by the evaporator, and cold end outlet air of the heat returner is fed to the condenser; the cooling equipment is positioned at the front end of the hot pump evaporator; the air feeding machine is positioned behind the condenser and the circulating air is pressurized and fed to the drying chamber; and the condensed water collection and drainage device is positioned below the heat returner, the cooling equipment and the evaporator. The dryer is used for drying the sludge.

Description

technical field [0001] The invention relates to a sludge drying equipment. It belongs to the technical field of drying machinery and equipment. Background technique [0002] In the process of recycling the sludge in the water treatment process, the removal of moisture in the sludge has always been a problem in the industry. The low-temperature thermal drying technology represented by the heat pump sludge drying technology is a better sludge treatment method. , can significantly reduce the volume of sludge, the product has stable properties, no odor and no pathogenic organisms; the sludge product after drying treatment has many uses, and can adapt the sludge characteristics to the needs of a wider range of treatment and disposal processes. A sludge treatment method worth promoting. [0003] At present, the heat pump sludge drying technology is limited by the working temperature of the heat pump, and its stand-alone dehumidification rate still needs to be improved. Conventi...

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Problems solved by technology

[0004] The invention provides a heat pump sludge dryer with evaporator precooling, in order to solve the problem that the existing heat pump sludge drying technology cannot use outdoor air to precool the circulating air in the system, so as to reduce the operating energy consumption of the heat pump and improve the dehumidification efficiency. rate problem

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