A heat pump type closed sludge drying system and its control method

Abstract

A heat pump type closed sludge drying system, comprising a drying room (1), an upper conveyor belt (2) set on the upper part of the drying room and transporting sludge, and a lower conveyor belt (2) set on the lower part of the drying room and transporting sludge (3), characterized in that the heat pump type closed sludge drying system also includes a system casing (4) arranged on one side of the drying room, and the top of the drying room is connected to the top of the system casing to form a loop The main air supply port is formed on the side wall of the air channel (5) and the side wall connected to the system shell below the lower conveyor belt to connect with the system shell; a heat pump type closed sludge drying system also includes The first heating circulation system, the second heating circulation system, and the air duct circulation system in the body. The invention provides a heat pump type closed sludge drying system and a control method thereof, which have many advantages such as energy saving, environmental protection and high efficiency.

Description

technical field [0001] The invention relates to the field of sewage treatment and heat pump heat exchange, in particular to a heat pump type closed sludge drying system and a control method thereof. Background technique [0002] As the public in our country attaches great importance to sewage treatment, the main market of sewage treatment in my country has basically been completed. In the future planning, the sewage treatment market will be further promoted and expanded, and the efficiency of sewage treatment and the average technical level of the industry will be improved. As a derivative of sewage, the output of sludge has also been increasing in recent years. In 2015, the output of domestic sludge reached 35 million tons, a year-on-year increase of 16%. It is estimated that about 10,000 tons of sewage produce 50,000-80,000 tons of sludge in terms of municipal sludge. According to experts' estimates, my country produces 30 million to 40 million tons of municipal sludge wi...

AI Technical Summary

Problems solved by technology

A large number of sewage treatment enterprises use direct dumping or simple landfill treatment to treat sludge, which not only threatens the soil environment and the health of residents, but also causes a waste of resources

At the end of 2015, the relevant inspection team showed that the harmless treatment rate of sludge in Beijing was only 23%, while the national effective treatment rate was far lower than 30%.

[0004] The common features of thermal forced drying are complex system, deodorization treatment, high drying temperature, high energy consumption, and the dried sludge needs to be cooled before storage and transportation

Due to the above characteristics, the application of thermal forced drying is difficult to be used in large-area push tubes

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