Pyrolysis and incineration dual-mode multi-hearth furnace sludge heat treatment device and method

Abstract

The present invention proposes a pyrolysis and incineration dual-mode multi-hearth furnace sludge heat treatment device and method, comprising: the feeding port of the multi-functional sludge storage bin is connected to raw sludge, and the discharge port of the multi-functional sludge storage bin is The port is connected to the feed port of the sludge supplementary drying device through the mud cake delivery pump group, and the sludge supplementary drying device is connected to the feed port of the multi-hearth furnace through a forced spiral stirring mechanism. The process of the multi-hearth furnace The tail gas outlet is connected to the secondary furnace, waste heat steam boiler, gas scrubber, biological deodorization tower, cyclone demister, and main induced draft fan in sequence, and the main induced draft fan discharges the treated gas into the air. The invention can ensure that the solid-phase content of the dried sludge entering the furnace can reach more than 45% no matter whether the core equipment multi-hearth furnace adopts the incineration mode or the pyrolysis mode, so that the furnace can always maintain the self-heating equilibrium operating condition , to maximize energy saving goals.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a pyrolysis and incineration dual-mode multi-hearth furnace sludge heat treatment device and method. Background technique [0002] Heat treatment of wastewater sludge (including domestic wastewater sludge, industrial wastewater sludge, river bottom sludge, etc.) This type of process technology has been commercially operated since the 1930s, and has a history of nearly 80 years of application. [0003] There are two technical categories for thermal treatment of wastewater sludge. [0004] The first is the incineration process. In the reaction atmosphere of high temperature (700 to 900 ° C) and sufficient oxygen (over 6% excess oxygen concentration), the organic matter in the sludge can be completely burned, and the final solid ash carbon content is less than 5%. And the volume of ash and slag is only 2% to 5% of the volume of raw sludge. [0005] The other is the p...

AI Technical Summary

Problems solved by technology

The two operating modes have very different operating load requirements for the sludge supplementary drying device system. If the supplementary drying device in the incineration operation mode continues to be used, it is bound to consume more energy when the pyrolysis mode is used to operate the multi-chamber furnace. Auxiliary fuel, which greatly reduces the energy-saving advantages of the pyrolysis process

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