Sludge drying system of combined solar energy and multi-coupled heat pump

Abstract

The invention relates to a sludge drying system of combined solar energy and multi-coupled heat pump, belonging to the technical field of sludge drying. In order to improve energy utilization rate of solar energy sludge drying technology, the provided system comprises: a solar energy greenhouse subsystem comprising a greenhouse containment module, a base plate module and a gas diversion module; and a heat pump subsystem, wherein a heat source of the heat pump subsystem comprises external ambient air and recycled water, the heat pump subsystem is connected with the gas diversion module and provided with a closed circulation system composed of an evaporator set, an expansion valve set, a condenser, a frequency conversion compressor and pipelines, and the closed circulation system can introduce hot air and dehumidify wet air. The heat pump subsystem is further provided with a valve regulator which controls opening amount of each expansion valve when more than one expansion valve are simultaneously opened. The system utilizes a frequency conversion compressor and the valve regulator to control running of the heat pump subsystem, so as to ensure that the heat pump always runs in a relatively small temperature differences between high and low temperature heat sources, thereby improving operation efficiency and energy utilization rate of the solar energy drying system.

Description

technical field [0001] The invention belongs to the technical field of sludge drying, and relates to a sludge drying system combined with solar energy and multi-connected heat pumps. Background technique [0002] Sludge drying is an important part of municipal sewage treatment, and it is also a process that consumes a lot of energy. Reducing the moisture content of sludge through drying treatment can achieve the purpose of resource utilization, stabilization, reduction and harmlessness. At present, there is a technical idea of ​​using solar energy to dry sludge. Since abundant solar energy resources can be used free of charge, a large amount of conventional energy can be saved, which has great economic and environmental benefits. [0003] Among them, the main features of solar energy utilization include: [0004] (1) Universality: The sun shines all over the earth, no matter land or sea, no matter mountains or islands, it is everywhere, can be directly developed and utiliz...

AI Technical Summary

Problems solved by technology

In winter, it is roughly only half, and in cloudy days, it is generally only about 1 / 5, so the energy-flux density is very low;

[0010] (2) Instability: Due to the limitation of natural conditions such as day and night, season, geographical latitude and altitude, as well as the influence of random factors such as sunny, cloudy, cloud and rain, the solar irradiance reaching a certain ground is intermittent is extremely unstable, which increases the difficulty of large-scale application of solar energy

When the system starts and stops, there is a large energy loss in the system, which does not give full play to the technical advantages of the heat pump, so that there are still considerable defects in the energy utilization rate

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