Sludge drying and incineration device and method

Abstract

The invention discloses a sludge drying and incineration device and a sludge drying and incineration method. A sludge inlet and a flue gas outlet are formed at the upper end of a device body, a drying chamber, an upper-bed air distribution plate, a combustion chamber, a lower-bed air distribution plate and a slag discharge opening are sequentially arranged in the device body from top to bottom, replenished air inlets are formed on a side wall of the device body on the upper part of the upper-bed air distribution plate, an auxiliary fuel inlet is formed on the side wall of the device body above the lower-bed air distribution plate, a primary air opening is formed on the side wall of the device body below the lower-bed air distribution plate, and the upper part of the drying chamber is connected with the bottom of the combustion chamber through a discharge opening, an upper-bed discharge tube, a feeder, a high-pressure air opening, a lower-bed return tube and a return opening. The quantity of drying equipment outside a furnace is decreased, thermal loss due to low heat exchange efficiency of the drying equipment in sludge drying and incineration technology is reduced, the investmentand running cost of the drying equipment outside the furnace are lowered, the complexity of a system is reduced, and sludge can be combusted stably in a single fluidized bed furnace.

Description

technical field [0001] The invention relates to an incineration device and a method thereof, in particular to a sludge drying incineration device and a method thereof. Background technique [0002] my country's sludge treatment technology is currently mainly agricultural and landfill. However, the most important thing about the use of sludge in agriculture is the use of safety issues. Since the sludge contains a large number of pathogenic bacteria, heavy metals are enriched, and chemical agents are added during the dehydration process, the efficacy and harmlessness of sludge fertilizers need further study. For landfill, because the sludge contains a lot of harmful substances, it also has the disadvantages of high water content, easy to block the seepage pipe of the landfill, so that the landfills in places like Hangzhou and Shenzhen have banned the acceptance of sewage sludge. In recent years, there have been researches on the utilization of sludge as building materials in...

AI Technical Summary

Problems solved by technology

[0011] (1) The thermal efficiency of general drying equipment is only 80%, which produces additional heat loss compared with direct incineration in the furnace, so it is often necessary to invest additional auxiliary fuel

[0012] (2) High power consumption of drying equipment

[0013] (3) The price of drying equipment is high, which accounts for a relatively large share of system investment

[0014] (4) There is a heating surface in the furnace, and the boiler consumables are relatively large

[0015] (5) The system is relatively complex and the annual running time is low

[0016] It can be seen that, for sludge treatment cost and energy consumption, although the traditional sludge incineration after drying has improved compared with the direct incineration of sludge, it is still quite high and needs to be reduced urgently.

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