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Fluidized-bed incinerator and method of fluidized-bed incineration of sludge with the same

A technology of incinerators and fluidized furnaces, which is applied in the direction of combustion methods, fluidized bed combustion equipment, fuels burned in a molten state, etc., to achieve the effect of reducing consumption

Active Publication Date: 2010-09-29
METAWATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is directly applied to a sludge incinerator, the amount of supplementary fuel used becomes a problem, and it is unsatisfactory from the viewpoint of energy saving.

Method used

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  • Fluidized-bed incinerator and method of fluidized-bed incineration of sludge with the same
  • Fluidized-bed incinerator and method of fluidized-bed incineration of sludge with the same
  • Fluidized-bed incinerator and method of fluidized-bed incineration of sludge with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The sludge incineration experiment was performed while changing the conditions using a fluidized furnace for the experiment. The input amount of sludge is all 80kg / h, and A heavy oil is used as auxiliary fuel. Experiments are as follows 4 kinds: conventional fluidized incineration, high temperature incineration with increased incineration temperature, and the present invention figure 1 The method shown, the present invention figure 2 method shown. It should be noted that, with respect to the present invention figure 2 In the method shown, propane gas was used in an amount corresponding to 300 ppm of the exhaust gas amount as the auxiliary fuel supplied from the auxiliary fuel supply pipe. For various incineration methods, the amount of supplementary fuel used (expressed as the calorific value of supplementary fuel per 1 kg of sludge), the temperature of the free air space (free board), the temperature of the furnace outlet, and the amount of nitrogen contained in t...

Embodiment 2

[0051] In the same manner as in Example 1, using a fluidized furnace for an experiment, the conditions were changed so that the amount of auxiliary fuel used could be further reduced, and a sludge incineration experiment was performed. The input amount of sludge was all 80 kg / h, and A heavy oil was used as auxiliary fuel. For various incineration methods, the amount of auxiliary fuel used (expressed as the calorific value of auxiliary fuel per 1 kg of sludge), the temperature of the free air space, the temperature of the furnace outlet, and the amount of nitrogen contained in the furnace were measured. 2 The concentration of exhaust gas components of O, the total excess air factor, the 1st excess air factor, and the 2nd + 3rd excess air factor are listed in Table 2.

[0052] [Table 2]

[0053]

[0054] Table 2 shows that the figure 1 In the method, while keeping the total excess air ratio constant, the primary excess air ratio is sequentially reduced from 1.2 to 0.9 data....

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Abstract

The inside of a furnace body (1) into which a sludge is introduced is divided in the height direction into the following: a lower part which serves as a pyrolysis zone (3) in which air for fluidization having an air ratio of 1.1 or lower is supplied together with a fuel to burn the fuel and pyrolyze the sludge while fluidizing the sludge; a part right over the zone (3), the part serving as an on-layer combustion zone (4) in which only air for combustion having an air ratio of 0.1-0.3 is supplied to thereby form a local high-temperature field to decompose N2O; and an uppermost part of the furnace body, the part serving as a complete combustion zone (5) in which an unburned matter is completely burned. The amount of N2O generating during sludge incineration can be considerably reduced while maintaining the amount of a supplemental fuel to be used on the same level as in conventional incineration methods. A supplemental-fuel reaction zone (10) in which only the supplemental fuel is fed to decompose N2O may be formed between the pyrolysis zone (3) and the on-layer combustion zone (4). This constitution can further reduce the amount of N2O to be generated.

Description

technical field [0001] The present invention relates to a fluidized incinerator capable of suppressing N, which is a greenhouse gas, and a fluidized incineration method for sludge using the same. 2 O generation while incinerating sludge containing nitrogen components. Background technique [0002] Sludge represented by sewage sludge contains a large amount of nitrogen components derived from protein, and various nitrogen oxides are generated by incineration and discharged into the atmosphere. Among these nitrogen oxides, especially N 2 O (nitrous oxide), due to the 2 For a gas that has 310 times the greenhouse effect, it is particularly strongly demanded to reduce it. [0003] Conventionally, for sludge incineration, fluidized incinerators that hardly generate dioxins have been widely used, and incineration is generally performed at about 800°C. However, it is known that when the incineration temperature is increased to 850 °C, N 2 The amount of O produced is reduced to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/30F23C10/20F23G7/04
CPCF23G2202/101F23G2900/54402F23G5/30F23G2207/30F23G2203/502F23G7/001F23G2900/50007F23G2207/60F23G5/50F23J2215/101F23C10/20F23G7/04
Inventor 山田正树柳濑哲也山本昌幸竹下知志神谷幸资
Owner METAWATER CO LTD
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