Incineration processing method and device for wet sludge

A treatment device and wet sludge technology, which is applied in the field of wet sludge incineration treatment and wet sludge incineration treatment device, can solve the problems of complex system, high cost of harmless treatment, complex system, etc., and achieve high combustion efficiency , Simplified incineration treatment process, high material concentration effect

Active Publication Date: 2009-06-24
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing sludge incineration method requires pretreatment of the sludge such as drying first, and then incineration, which complicates the system; at the same time, incineration of the dried sludge will produce a large amount of NOx, and must be equipped with a degasser after the incinerator. Nitrogen device; since the sludge contains sulfur, it must also be equipped with a desulfurization device after the incinerator
Therefore, the existing sludge incineration process includes multiple unit processes such as sludge drying, sludge incineration, tail gas desulfurization, tail gas denitrification, etc., which are carried out in unit equipment respectively, which makes the system complex and the cost of harmless treatment is high.

Method used

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  • Incineration processing method and device for wet sludge

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Effect test

Embodiment 1

[0022] A papermaking sludge produced by a paper mill has a moisture content of 70%, a low calorific value of about 3200kJ / kg, a sulfur content of 0.05%, and an alkali metal content of about 0.05%. According to the method of the present invention, the Martin grate furnace is used to directly incinerate. The wet sludge is added to the furnace whose temperature has risen to about 900°C, and the wet sludge starts to dry and catch fire; part of the air required for incineration is blown in from the bottom of the grate, and the water evaporated from the sludge is added to the furnace, and the furnace A reducing atmosphere is formed above the grate to suppress the production of NOx during incineration; another part of the air required for incineration is sprayed into the furnace from above the grate to burn out the sludge; due to the low water content and high calorific value of the sludge, Therefore, the temperature of the furnace can be maintained at about 850°C without adding auxi...

Embodiment 2

[0024] A papermaking sludge produced by a paper mill has a water content of 50%, a low calorific value of about 4000kJ / kg, a sulfur content of 0.06%, and an alkali metal content of about 0.01%. According to the method of the present invention, a circulating fluidized bed boiler is used incinerate. The sludge is fed into the furnace through the screw feeder together with a large amount of coal from the coal inlet of the boiler. The temperature of the furnace is controlled at 800-950 ° C, and limestone powder is added to the furnace for desulfurization, and the formation of NOx is suppressed by graded air distribution. Applying the method of the invention to a circulating fluidized bed boiler can provide hot water or steam to the outside for heat supply or power generation while incinerating wet sludge.

Embodiment 3

[0026] A kind of sewage sludge produced by a domestic sewage plant, with a water content of 90%, a low calorific value of about 400kJ / kg, a sulfur content of 0.38%, and an alkali metal content of about 0.002%. According to the device of the present invention, a circulating fluidized bed wet sludge incinerator is used for incineration. The circulating fluidized bed wet sludge incineration device is composed of a furnace 1, a separator 2, a feeder 3 and a tail flue 4. The furnace 1 is insulated on the side wall, and the wet sludge is directly fed from the sludge inlet 11 on the furnace top. Add the furnace 1, the waste sawdust is added into the furnace 1 from the auxiliary fuel inlet 13 at the bottom of the furnace 1, and the limestone is added into the furnace 1 from the limestone inlet 14 at the bottom of the furnace 1, and the air required for incineration is divided into primary air and secondary air, respectively from The primary tuyere 15 at the bottom of the furnace 1 and...

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Abstract

The invention relates to a wet sludge incineration treatment method and device. The wet sludge is directly incinerated in an incinerator at 800-950°C or added with auxiliary fuel; the required air is graded and fed into the furnace; limestone can also be added to the furnace to reduce the temperature. SO2 emissions. The incineration treatment device includes a furnace, a cyclone separator, a feeder and a tail flue; the side wall of the furnace is insulated, the top of the furnace is equipped with a wet sludge inlet, and the lower part is equipped with an auxiliary fuel inlet; the tail flue is equipped with a high-temperature air preheating device. The invention integrates wet sludge drying, incineration and flue gas harmless treatment in a single device simultaneously, simplifies the incineration treatment process of wet sludge, reduces treatment cost and can realize low-level discharge of incineration pollutants.

Description

technical field [0001] The invention relates to a waste treatment method and device, in particular to a wet sludge incineration treatment method; the invention also relates to a wet sludge incineration treatment device. Background technique [0002] Sludge is a by-product of sewage treatment, and the amount of sludge accounts for 0.3% to 0.5% (volume) or 1% to 2% (mass) of the sewage treatment volume. With the development of industrial and agricultural production and the continuous construction of sewage treatment plants in various places, the amount of industrial and domestic sewage treatment in my country is increasing rapidly, and more sludge will be generated. The composition of sludge is very complex. In addition to a large amount of water, it also contains a large amount of organic matter, refractory organic matter, various trace elements, pathogenic microorganisms, parasite eggs, and heavy metals. How to make harmless and resourceful sludge with huge output and compl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/04F23G7/00F23G5/30
Inventor 吕清刚那永洁包绍麟高鸣孙运凯贺军矫维红马人熊
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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