Solar energy heat pump combined sludge drying system and drying method

Abstract

The present invention discloses a solar energy heat pump combined sludge drying system, which comprises a solar energy heat supply subsystem, a heat pump subsystem and a drying device subsystem, wherein the heat pump subsystem comprises an air source heat pump subsystem and a reclaimed water source heat pump subsystem, the solar energy heat supply subsystem comprises a heat collection device for collecting solar radiation energy, a hot water storage tank, a first water pump and a hot water coil pipe, and the hot water storage tank, the first water pump and the hot water coil pipe are connected through pipelines to form a sealed water circulation system. According to the present invention, solar energy heat can be effectively utilized, water vapor latent heat in wet air can be recovered, and energy required by sludge drying at night or in case of insufficient solar energy can be ensured with the solar energy heat supply subsystem and the reclaimed water source heat pump subsystem.

Description

technical field [0001] The invention relates to the technical field of sludge drying, in particular to a solar heat pump combined sludge drying system and drying method. Background technique [0002] According to the "Decision of the State Council on Implementing the Scientific Outlook on Development and Strengthening Environmental Protection", by 2010, the urban sewage treatment rate will not be lower than 70%. At the end of the "Eleventh Five-Year Plan", the national urban sewage treatment capacity will reach 1.0×10 8 m 3 / d, the annual sewage treatment capacity reaches 3.0×10 10 m 3 , the sludge output will reach 3.0×10 7 t (80% moisture content). With the increase of sewage treatment rate and treatment depth, sludge discharge is increasing at a rate of more than 10-15% per year. Sludge treatment and disposal has become an environmental bottleneck for urban development. The resource utilization of sludge has become an important means of sludge treatment and disposa...

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Problems solved by technology

[0004] However, the solar energy system in the existing sludge drying equipment combined with solar energy and heat pump has only heat collecting equipment, but no heat storage equipment

In this way, the heat load absorbed by solar energy in summer may be greater than the heat load required by the drying equipment, resulting in low energy utilization in summer

[0005] Secondly, the heat pump drying system in the existing sludge drying equipment combined with solar energy and heat pump uses an air source heat pump, but due to the cold winter in northern my country, if the outdoor ambient temperature drops below 0°C, if the air source heat pump is still used for heating , the performance of the heat pump will be significantly reduced or even unable to work. In addition, due to the small heat transfer coefficient between the evaporator tube wall and the air, the sludge drying equipment that uses air source heat pump combined with solar energy and heat pump occupies an area of larger

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