Water-cooled closed sludge drying system and temperature control method thereof

Abstract

The invention provides a water-cooled closed sludge drying system and a temperature control method thereof. The water-cooled closed sludge drying system comprises a drying oven, a main air blower, a main condenser, an evaporator, a water cooler, a compressor, a water pump and a water cooling tower; the water cooler, the evaporator, the main condenser, the main air blower and the drying oven are connected by an air guide pipeline to form a closed circulating drying loop; the compressor, the main condenser and the evaporator are connected by a refrigerant pipeline to form a closed circulating refrigerant loop; and the water cooler is connected with the water pump and the water cooling tower to form a temperature regulating loop. The temperature control method of the water-cooled closed sludge drying system is to control a water flow by virtue of variable frequency regulation of the water pump, so that the heat exchange amount of the water cooler is controlled, the cooling quantity deficient at an evaporation side is replenished, and furthermore, the load balance of circulating air between the evaporation side and a condensation side is balanced, and the drying temperature is kept tobe stable. The temperature control method of the system is simple in control way, high in control precision and high in control reliability.

Description

technical field [0001] The invention relates to the technical field of sludge drying, in particular to a water-cooled closed sludge drying system and a temperature control method thereof. Background technique [0002] The dehumidification energy efficiency ratio SMER (specific moisture evaporation rate) is an important index to measure the dehumidification performance of the drying device. For traditional dryers, such as superheated steam dryers, the theoretical SMER value is 1.595kg / (kw·h) (100°C), but the actual device SMER value is only 20% to 80% of the theoretical value. [0003] Driven by favorable policies and high growth factors, the standardization of sewage and sludge treatment has raised demand for the drying equipment market. In the sludge drying process, the drying temperature directly affects the drying effect of the sludge. In addition, the drying temperature has a crucial impact on the water removal rate of the unit, the dehumidification energy efficiency ra...

AI Technical Summary

Problems solved by technology

The existing drying temperature control method of the drying machine has problems such as complicated control, poor control precision, and low reliability.

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