Sludge gasification and incineration furnace

Abstract

The invention discloses a sludge gasification and incineration furnace. The sludge gasification and incineration furnace comprises a gasification and incineration chamber, sludge feeding devices, a separator and an afterheat utilization device. A smoke gas outlet is formed in the upper part of the gasification and incineration chamber; the gasification and incineration chamber comprises a gradualenlargement zone, a transitional zone, a gradual contraction zone and a top constant-cross-section zone; feeding holes are formed in the middle of the transitional zone and are connected with the sludge feeding devices; the two feeding holes are distributed and are symmetrically formed in the two sides of the transitional zone; and the two sludge feeding devices are arranged in correspondence withthe feeding holes. When gasification and incineration of the sludge with moisture ratio being less than 70 percent is performed, the sludge feeding devices select two-stage feeding devices which arearranged in a stepped mode, and the later-stage feeding device selects a shaftless auger; and a spray head is arranged at an outlet; and when gasification and incineration of the sludge with moistureratio being more than or equal to 70 percent is performed, the sludge gasification and incineration furnace also comprises an air heating device, and high-temperature air is heated as ultra-high-temperature air and is used as primary air. According to the sludge gasification and incineration furnace disclosed by the invention, the sludge can be scattered and uniform feeding can be performed, and the furnace has the advantages of high drying efficiency and high gasification and incineration efficiency of the sludge.

Description

technical field [0001] The invention relates to a sludge gasification incinerator, which belongs to the field of sludge gasification. Background technique [0002] Sludge often affects its combustion stability in direct combustion incinerators due to its high moisture content, causing problems such as unstable combustion or local deflagration, and the moisture evaporates into the flue gas to make the moisture content of the flue gas too high, which is easy to Corrosion of pipelines and subsequent equipment. First gasification and then combustion, not only fully utilizes the water in the sludge as a gasification agent to participate in the reaction under medium and low temperature conditions, so that the reaction stability is improved; moreover, the gasification process can homogenize the sludge with complex components, Make the subsequent combustion process more stable and sufficient. [0003] Due to the high water content and low calorific value of sludge, most sludge inc...

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Problems solved by technology

[0003] Due to the high water content and low calorific value of sludge, most sludge incinerators currently use bubbling fluidized bed incineration and circulating fluidized bed incineration. High initial emissions, insufficient combustion, etc.; circulating bed incineration of sludge, in addition to high requirements for moisture and calorific value, has low initial emissions and relatively sufficient combustion, but the high temperature of direct combustion can easily lead to unstable combustion, and The high temperature of the separator often leads to clogging or slagging, serious ash and slagging at the tail, and a large amount of fly ash

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