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Method for reducing NOx in smoke through ammonia source of household garbage

A technology for household waste and removal, applied in combustion methods, separation methods, chemical instruments and methods, etc., can solve problems such as increased operating costs and unsatisfactory NO absorption effect, and achieves lower treatment costs, better treatment effects, and improved production. safety effect

Inactive Publication Date: 2014-09-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lye on the NO in NOx 2 Although it has a certain absorption effect, the absorption effect on NO is very unsatisfactory
In addition, the use of alkali absorption method not only needs to increase the operating cost, but also produces new solid slag

Method used

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  • Method for reducing NOx in smoke through ammonia source of household garbage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A pyrolysis gasification treatment device for domestic waste, the size of the gasifier and the combustion system are respectively Φ1800×4500mm and 3000×2500×6000mm, and the daily processing capacity is 120t. Household waste is fermented in Heap 1 for 7 days at a fermentation temperature of 48°C. During, it will release the NH containing 3 and H 2 S, CH 4 、H 2 O.CO 2 The degraded gas of equal composition, it will be exported through rubbish degraded gas output pipeline 8 together with the air in the stacker;

[0028] Step 2: Due to fermentation, domestic waste will release leachate at the same time, it will enter the landfill leachate collection tank through landfill leachate pipeline one 10, and then enter the methanation biogas fermentation tank 7 through landfill leachate pipeline two 11, biogas The biogas in the pool 7 is exported through the biogas output pipeline 12;

[0029] Step 3: Degradation gas, biogas and air will pass through the mixed gas p...

Embodiment 2

[0031]Example 2: In a direct incineration treatment device for domestic waste, the dimensions of the gasifier and combustion system are Φ2400×5200mm and 4000×3000×6500mm respectively, and the daily processing capacity is 300t. Household waste is fermented in Heap 1 for 5 days at a fermentation temperature of 45°C. Afterwards, after operating as step 1 to step 4 of Example 1, finally in the upper part of the incinerator (combustion system), the NOx in the flue gas and the ammonia in the mixed gas of ammonia and air sent by the blower 3 generate reaction. At this time, the average temperature of the upper part of the incinerator (combustion system) was 862°C. After the reaction, the flue gas flow rate discharged from the combustion system through pipeline 17 is 52500Nm 3 / h, including NOx=78mg / Nm 3 , the residual ammonia content is 3mg / Nm 3 , it will be removed through subsequent water washing, desulfurization and other operations.

Embodiment 3

[0032] Example 3: A direct incineration treatment device for domestic waste, the size of the gasifier and the combustion system are respectively Φ3000×6200mm and 5000×4500×7000mm, and the daily processing capacity is 500t. Household waste is fermented in Heap 1 for 6 days at a fermentation temperature of 46°C. Afterwards, after operating as step 1 to step 4 of Example 1, finally in the upper part of the incinerator (combustion system), the NOx in the flue gas and the ammonia in the mixed gas of ammonia and air sent by the blower 3 generate reaction. At this time, the average temperature of the upper part of the incinerator (combustion system) is 885°C. After the reaction, the flue gas flow rate discharged from the combustion system through pipeline 17 is 87680Nm 3 / h, including NOx=91mg / Nm 3 , the residual ammonia content is 5mg / Nm 3 , it will be removed through subsequent water washing, desulfurization and other operations.

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Abstract

The invention relates to a method for reducing NOx in smoke through an ammonia source of household garbage. Gas containing ammonia and the NOx in the smoke in the heat treatment process of the household garbage at high temperature are subjected to chemical reaction, wherein the gas containing the ammonia is generated by fermenting the household garbage and leachate, the scientific principle is similar to the principle of a common smoke denitration SNCR method, a temperature window at the temperature of 850 DEG C-1100 DEG C) is ingeniously utilized in the heat treatment process of the household garbage at the high temperature, an ammonia source does not need to be additionally arranged on a treatment system, in this way, treating cost is reduced, besides, the effect is good, and the method is environmentally friendly, safe and reliable. In the smoke exhausted in the heat treatment process of the household garbage, NOx<=100 mg / Nm3.

Description

technical field [0001] The invention relates to domestic garbage treatment, in particular to a method for removing NOx from flue gas generated during direct incineration treatment, pyrolysis gasification treatment or gasification melting treatment of domestic garbage. Background technique [0002] According to official statistics, China produced about 600 million tons of domestic waste in 2010, including 155 million tons of municipal solid waste, accounting for 30% of the world's annual output of municipal solid waste. High-temperature heat treatment of domestic waste is an effective technology widely used in countries all over the world. There are three main methods of high temperature heat treatment: direct incineration method, pyrolysis gasification combustion method and gasification melting method. However, the flue gases produced by these three high-temperature heat treatment methods all contain CO 2 , SO 2 , NO, NO 2 , HCl, HF and other acidic components, as well a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56F23G5/02F23G7/06
Inventor 张志炳张锋周政罗宋孟为民彭璟王宝荣
Owner NANJING UNIV
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