Low-temperature heat pump sludge drying device for controlling double heat exchangers by single compressor

Abstract

The invention discloses a low-temperature heat pump sludge drying device for controlling double heat exchangers by a single compressor. The low-temperature heat pump sludge drying device comprises a sludge channel, an air channel and a heat pump system, wherein the sludge channel is composed of a sludge inlet, a multilayer conveyer mesh belt connected end to end, and a sludge outlet; the air channel is composed of a fan, an air filtering device, evaporators and condensers; the fan is arranged below the multilayer conveyer mesh belt; the air filtering device, the evaporators and the condensersare arranged above the multilayer conveyer mesh belt; the heat pump system is composed of an evaporator, a condenser, a compressor, a liquid storage tank, a gas-liquid separator and an electronic expansion valve; the fan comprises a first fan and a second fan; and two groups of the evaporators and two groups of condensers are arranged. Double-channel air supply is performed by adopting double airoutlets of the two fans, the air supply quantity of a closed sludge drying room is increased, the heat and moisture exchange quantity between dried air and sludge is increased, and non-uniform distribution of the dried air in a rectangular box is avoided. The two groups of the evaporators and two groups of condensers are controlled by the same compressor, so that the effective heat exchange area of the two groups of the evaporators and condensers is enlarged, and the heat exchange effect is excellent.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a heat pump sludge low-temperature drying device in which a single compressor controls double heat exchangers. Background technique [0002] With the large-scale construction and operation of sewage treatment plants in my country, the sludge output has also increased significantly, and the threat to environmental pollution has become increasingly serious. However, most of the dehydrated sludge has a moisture content higher than 80% and contains a large amount of toxic and harmful substances. It is unstable in nature and difficult to utilize as resources. Therefore, proper drying treatment is extremely necessary before final disposal such as composting or incineration. The low-temperature heat pump drying technology in the drying technology has the advantages of small footprint, drying The unique advantages of high efficiency and little pollution to the environment. [0...

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Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the related art, the present invention proposes a heat pump sludge low-temperature drying device with a single compressor controlling double heat exchangers, which can solve the uneven drying effect and low energy utilization efficiency of the above-mentioned sludge low-temperature drying device. It is not high, and it is difficult to collect blanking materials

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