Sludge drying system and drying method for multi-stage heat energy step utilization

Abstract

The invention relates to the technical field of sludge treatment, and discloses a sludge drying system and a drying method for stepwise utilization of multi-stage heat energy. Including a steam drying system, a hot air drying system, and a circulating heat exchange system connecting the steam drying system and the hot air drying system; the steam drying system includes at least one steam drying machine, and the steam outlet of the steam drying machine passes through a pipeline It is connected in series with the exhaust steam regenerator and the exhaust steam condenser in sequence; the hot air drying system includes at least one hot air dryer, and the air outlet of the hot air dryer is connected with the hot air condenser, hot air preheater and hot air reheater in sequence through pipelines. In series connection, the air outlet of the hot air reheater is connected to the hot air inlet of the hot air dryer; the circulating heat exchange system is an independent circulation system of circulating medium, including a heat pump connecting the exhaust steam reheater and the hot air preheater. The invention has low energy consumption, high cycle thermal efficiency and good system operation stability.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge drying system and drying method for multi-stage thermal energy step utilization. Background technique [0002] For a long time, the situation of "heavy water and light sludge" has prevailed in my country's sewage treatment industry, and the status of sludge treatment and disposal is far from meeting the requirements of stabilization, reduction, harmlessness and resourceful disposal. Facing the severe environmental protection situation in China, the Ministry of Housing and Urban-Rural Development and the Development and Reform Commission have issued a series of policy planning documents to guide the development of the sludge treatment and disposal industry, requiring the layout of combined heat and power coal-fired power units to be coupled with sludge power generation technical transformation projects. Therefore, resource disposal of sludge and solid waste coupl...

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Problems solved by technology

[0007] The technical problems to be solved are: the existing sludge drying system consumes a lot of energy, the cycle efficiency is low, and the exhaust steam regenerator is easy to block, the system operation stability is poor, and the continuity is poor

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