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Incineration processing method and device for wet sludge

A treatment method and technology of a treatment device, which are applied in the field of wet sludge incineration treatment and wet sludge incineration treatment device, can solve the problems of high cost of harmless treatment, complicated system and complicated system, and simplify the incineration treatment process. , The effect of high combustion efficiency and high material concentration

Active Publication Date: 2006-04-26
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • 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, which must be equipped with a degasser after the incinerator. Nitrogen device; due to the sulfur in the sludge, it is necessary to equip 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 and a large amount of coal are fed into the furnace from the coal inlet of the boiler through the screw feeder. 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 discloses wet sludge burning disposal method and device, which comprises the following steps: burning the wet sludge in the furnace directly or adding auxiliary fuel; supplying air to the hearth step by step; adding limestone in the furnace to reduce the SO2 drainage. The device comprises the following parts: hearth, cyclone separator, refeed unit and rear flue, wherein the sludge filling inlet and auxiliary fuel filling inlet are set on the top and bottom of hearth separately; the high-temperature air preheater ranged from 300 to 600 deg.c is set in the rear flue. The invention simplifies the disposal technology due to drying, burning and smoke innocent treatment in one device, which discharges at low level.

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. technical background [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 Applications(China)
IPC IPC(8): F23G7/04F23G5/30F23G7/00
Inventor 吕清刚那永洁贠小银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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