Comprehensive thermal energy utilization method for multi-hearth furnace sludge pyrolysis system

Abstract

The invention discloses a comprehensive thermal energy utilization method for a multi-hearth furnace sludge pyrolysis system. The comprehensive thermal energy utilization method comprises the following steps: mixing and sufficiently combusting a pyrolysis process tail gas with secondary air blown by an air blower inside a secondary furnace, feeding high-temperature fume which is finally generated and comprises a small amount of dust type pollutants and trace acid gas components into a waste heat steam boiler, generating medium-pressure over-heated steam, feeding into a mud cake conveying pump group at the front end of a pyrolysis process and a main draft fan at the tail end of the pyrolysis process, and enabling the medium-pressure over-heated steam to directly drive the mud cake conveying pump group and a turbine in the main draft fan at the tail end of the process. According to the method, the thermal energy of the pyrolysis process tail gas and the high-temperature fume is recycled and utilized by using the waste heat steam boiler, the generated over-heated medium-pressure steam is applied to a turbine driving medium of a high-power electric appliance, a heat source medium of a sludge supplementing drying device, a heat-preservation/heating medium of a raw material sludge storage cabin and preparation solution/washing inlet water (hot water) of a scrubber tower in a gradient manner, and thus the comprehensive utilization efficiency of fume thermal energy is improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a thermal energy comprehensive utilization method of a multi-hearth furnace sludge pyrolysis system. Background technique [0002] The core equipment types of sludge thermal reduction technology include: multi-hearth furnace, fluidized bed furnace, grate furnace, converter, etc., mainly the former two. Among them, the fluidized bed furnace, the grate furnace and the converter can only adopt the incineration operation mode so far (the research on the pyrolysis operation mode of the fluidized bed furnace is still in the technical development stage), while the multi-hearth furnace can adopt both the incineration operation mode and The pyrolysis operation mode can be adopted, and the latter (pyrolysis operation mode) has gradually developed into the mainstream sludge thermal reduction process method. [0003] However, due to the complex nature and composition of wastewa...

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Problems solved by technology

In addition, although some projects have considered the characteristics of domestic sludge, they failed to pay enough attention to the "water balance" and "heat energy balance" of the sludge heat treatment process in the design, resulting in excessive energy consumption and loss of due energy. technical competitiveness

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