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Method and device for reducing emission limits of nitrogen oxides in waste incineration flue gas

A technology of waste incineration and nitrogen oxides, which is applied in the direction of combustion methods, exhaust gas devices, chemical instruments and methods, etc., can solve the problems of harmless, reduction, resource disposal, surrounding environment damage, and causing Greenhouse effect and other issues, to achieve good application and promotion value, low operating costs, and improve the use of heat energy

Inactive Publication Date: 2011-08-31
BMEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (2) It will cause the greenhouse effect
[0014] (3) It will cause damage to the ozone layer
[0032] Since our country is currently stepping up the construction of waste incineration projects, if no measures are taken, a large amount of nitrogen oxides will be discharged into the atmosphere, which will bring serious pollution to the atmosphere and damage the surrounding environment of the project, which will ultimately be detrimental to the harmless disposal of urban domestic waste. Hazardization, reduction, resource disposal

Method used

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  • Method and device for reducing emission limits of nitrogen oxides in waste incineration flue gas
  • Method and device for reducing emission limits of nitrogen oxides in waste incineration flue gas

Examples

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Embodiment 1

[0064] Such as figure 1 as shown,

[0065] A device for reducing the emission limit of nitrogen oxides in waste incineration flue gas, comprising a waste incineration treatment device, an optimized air supply device, a waste heat boiler device, an SNCR (selective non-catalytic reduction) device, and a tail gas treatment device.

[0066] The waste incineration treatment device includes a waste hopper, an incinerator, a combustion control device, a fire grate, a hydraulic device, an auxiliary burner, and an air inlet hopper;

[0067] The garbage feeding hopper is connected with the incinerator. The bottom of the incinerator is equipped with a cone-shaped air inlet hopper. The upper part of the air hopper is a grate piece. The grate is driven by a hydraulic device, and the stroke of the grate is controlled by a combustion control device; an auxiliary burner is installed at the end of the grate furnace, and when the temperature of the incinerator is lower than 850°C, the auxiliar...

Embodiment 2

[0080] A method for reducing the emission limit of nitrogen oxides in waste incineration flue gas is carried out according to the following steps:

[0081] Step 1: The garbage in the garbage storage pit enters the incinerator after being loaded by the grab bucket, and the incinerator uses the reciprocating motion of the grate to make the garbage fully incinerated through the drying section, burning section, and burning section; the garbage is burned The final ash is discharged from the incinerator. The processing capacity of this waste incinerator is greater than 300t / d, and it is suitable for waste with a calorific value greater than 5000Kj / Kg;

[0082] Step 2: The oxygen supply for garbage incineration is mainly supplied by the primary air. The source of the primary air supply is the gas in the garbage storage pit. The primary air enters the incinerator through the air inlet bucket under the grate, and the stench in the gas passes through the furnace be incinerated and remov...

Embodiment 3

[0089] A method for reducing the emission limit of nitrogen oxides in waste incineration flue gas, which mainly includes the following steps:

[0090] (1) The garbage enters the garbage incinerator smoothly through the feeding device, and the garbage is fully dried, burned and burned by the continuous action of the grate in the furnace, and the temperature in the combustion section reaches above 850°C;

[0091] (2) The oxygen supply for the combustion of materials in the garbage incinerator comes from the primary fan, and the source of the primary air supply is the gas in the garbage storage pit, and the stench in the gas is removed by the high temperature in the furnace;

[0092] (3) The flue gas after the combustion of the materials in the waste incinerator enters the waste heat boiler, and a secondary air supply port is set on the upper part of the connection between the two. The flue gas in the pipe before the chimney, this setting can reduce the oxygen content in the flue...

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Abstract

The invention relates to a method and a device for reducing emission limits of nitrogen oxides in waste incineration flue gas. In the method, processes of a waste incineration processing device, an optimizing air supply device, an exhaust-heat boiler device, a selective non-catalytic reduction (SNCR) device, a tail gas processing device and the like are integrated into a whole; by combining clean flue gas serving as secondary air supply and the SNCR device, the situation that the nitrogen oxides in the discharge of tail gas generated after wastes are processed by national waste incineration equipment is not removed effectively in low cost can be changed, and the removal ratio of the nitrogen oxides can be improved; and the removal rate of the nitrogen oxides after the device is optimized is more than 70 percent, so that the concentration of the tail gas discharged finally is lower than 150 mg / Nm<3> specified in the European Union standard 2000. Simultaneously, the optimizing device requires less increment investment and low running cost and is suitable to be applied and popularized in waste incineration equipment at home and abroad, and a denitration device is small in newly increased floor space.

Description

technical field [0001] The invention relates to a method and a device for reducing the emission limit of nitrogen oxides in waste incineration flue gas, and belongs to the technical field of environmental protection. Background technique [0002] Nitrogen oxides (NO x ) There are many types, mainly including nitric oxide (NO), nitrous oxide (N 2 O), nitrogen dioxide (NO 2 ), dinitrogen tetroxide (N 2 o 4 ), nitrogen pentoxide (N 2 o 5 ), etc., the main causes of air pollution are NO and NO 2 , it is generally believed that NO x NO accounts for about 95%, NO 2 About 5%. Atmospheric NO x There are two main sources of [0003] (1) Natural source [0004] Annual production of NO from natural sources x About 5×10 8 tons, high-altitude lightning can combine nitrogen and oxygen to produce NO x , other natural sources include: stratospheric injection, NH 3 Oxidation of biomass, combustion of biomass, release of soil, etc. [0005] (2) Man-made source [0006] Annua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/00F23J13/00B01D53/56B01D53/74
Inventor 钟红春朱柱民张成波史卓成杨路曹占强方宏萍许鑫星
Owner BMEI
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