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

Abstract

The invention proposes a method for comprehensive utilization of heat energy in a multi-hearth furnace sludge pyrolysis system, which includes the following steps: the tail gas of the pyrolysis process is mixed with the secondary air sent by the blower in the secondary furnace and fully burned, and finally produces a small amount of dust The high-temperature flue gas with similar pollutants and trace acidic gas components enters the waste heat steam boiler, and then produces medium-pressure superheated steam, which is sent to the mud cake delivery pump group at the front end of the pyrolysis process and the main induced draft fan at the end of the pyrolysis process for Directly drives the mud cake conveying pump set and the steam turbine in the main induced draft fan at the end of the process. The invention adopts the waste heat steam boiler to recover and utilize the thermal energy of pyrolysis process tail gas and high-temperature flue gas, and the superheated medium-pressure steam produced is cascadedly applied to the steam turbine driving medium of high-power electrical appliances and the heat source medium of the sludge supplementary drying device , The thermal insulation / heating medium of the raw sludge storage bin, the liquid preparation / washing water (hot water) of the scrubber, improve the comprehensive utilization efficiency of flue gas heat energy.

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...

AI Technical Summary

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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