Heat pump coupled adsorption type closed system for drying sludge

Abstract

The invention discloses a heat pump coupled adsorption type closed system for drying sludge. The structure of the system comprises three closed loops, namely a heat pump system refrigeration working medium circulation loop, an adsorption system regenerated air circulation loop and an air circulation loop for drying sludge. The heat pump system refrigeration working medium circulation has the effects of dehumidifying and heating the air for drying sludge, so that the air continuously performs circulation of a sludge drying process, a dehumidifying process and a heating process. A heat pump system utilizes the recovered condensation heat to heat the air for drying sludge. An adsorption system adopts a fixed bed, rotating wheel or moving bed adsorption device to dehumidify the air for dryingsludge for the second time so as to enhance the efficiency of the sludge drying process, and utilizes regenerated air to perform desorption treatment on the adsorption device saturated with water, thereby realizing continuous and uninterrupted operation of the adsorption system. The adsorption system adopts a cooling mode to dehumidify the high-humidity regenerated air, and simultaneously utilizesthe waste heat of the heat pump system as a unique heat source for heating the dehumidified regenerated air, so that the regenerated air continuously performs circulation of an adsorption device desorption process, a dehumidifying process and a heating process. The device is of a fully-closed structure, and both the adsorption system regenerated air circulation loop and the air circulation loop for drying sludge do not discharge any gas.

Description

[0001] manual technical field [0002] The invention relates to a closed system for drying sludge by using a heat pump coupling adsorption dehumidification treatment air. Specifically, it can be said that three medium circulation loops are adopted: a refrigeration working medium circulation loop, a hygroscopic agent regeneration medium circulation loop and a drying medium circulation loop. A combined airtight sludge drying system belongs to the technical fields of heat pump dehumidification technology, adsorption dehumidification technology and sludge drying technology. Background technique [0003] Domestic sewage and industrial wastewater treatment plants produce a large amount of sludge. In order to reduce transportation costs, landfill costs, fuel costs, investment in treatment and disposal facilities, etc., it is necessary to reduce the amount at the lowest cost. The most economical reduction measure is usually mechanical dewatering. Due to complex reasons such as the...

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Problems solved by technology

The malodorous gas will be absorbed by the hygroscopic agent, then desorbed by the regeneration medium, and discharged into the external environment along with the regeneration medium, causing secondary environmental pollution

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