Method for reducing nitric oxides by using disposed sludge

A technology of nitrogen oxides and sludge, which is applied in chemical instruments and methods, combustion methods, sludge treatment, etc., can solve the problems of high and low denitrification efficiency, and achieve the reduction of nitrogen oxides, cost reduction, and nitrogen reduction The effect of oxide emissions

Inactive Publication Date: 2013-02-13
BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD
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Problems solved by technology

However, SNCR technology has unstable problems such as high and low denitrification efficiency in the application of different devices

Method used

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  • Method for reducing nitric oxides by using disposed sludge

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Embodiment Construction

[0034]A kind of embodiment of the method that utilizes disposal sludge to reduce nitrogen oxides of the present invention, as shown in accompanying drawing, it comprises the following steps:

[0035] (1) After the domestic sludge from the sewage treatment plant is transported into the plant by vehicles, it enters the agitator for stirring;

[0036] (2) After the sludge is evenly stirred, it is transported to the conveyor screening machine to further break up the large particle sludge;

[0037] (3) After breaking up, the large particle sludge is thrown out through the small hole in the barrel wall of the conveying screening machine (due to the effect of centrifugal force), and directly enters the sludge tank for disposal, while the unbroken sludge is collected After that, it circulates again into the agitator for stirring;

[0038] (4) The sludge entering the sludge tank is stirred and mixed for the second time in the sludge tank, and waste liquid is appropriately added accord...

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Abstract

The invention relates to a method for reducing nitric oxides by using disposed sludge. The method comprises the following steps of: conveying domestic sludge from a sewage treatment plant to a plant by using a vehicle, uniformly stirring the domestic sludge in a stirrer, conveying the domestic sludge to a conveying sieving machine, and further scattering large-particle sludge; throwing the scattered sludge out through small holes in the barrel wall of the conveying sieving machine to directly enter into a sludge pond for being disposed, collecting un-scattered sludge and then recycling to enter into the stirrer for being stirred; stirring and mixing the sludge entering into the sludge pond for the second time, directly throwing into a sludge spray gun through a sludge pump, and throwing wet sludge into a kiln tail decomposition furnace for incineration through a scattering function of the spray gun. The method has the advantages that a reducing atmosphere is formed in a cement kiln decomposition furnace while sludge is disposed by using ammonia nitrogen in the sludge, most of nitric oxides can be directly reduced into nitrogen, thus the nitric oxides in the tail gas of a cement kiln can be reduced, and the disposition amount of the sludge is increased.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for reducing nitrogen oxides in cement kiln tail gas by using sludge. Background technique [0002] Nitrogen oxides coexist in the atmosphere mainly as nitrogen monoxide and nitrogen dioxide. Nitrogen oxides can cause a variety of respiratory diseases, are the main pollutants that form photochemical smog, and are also one of the main acidic substances that form acid rain. Sulfur dioxide and nitrogen oxides can also form fine particles of inorganic salts, aggravating fine particle pollution in the air. Cement enterprises have become the third largest nitrogen oxide emitter after thermal power generation and vehicle exhaust. At present, my country has nearly 5,000 cement enterprises, and its output has ranked first in the world for many years. In 2010, the country's cumulative total cement output was 1.87 billion tons, and nitrogen oxide emissions were 2.07 million tons, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00F23G7/00
Inventor 蔡金山熊运贵曾文飞王义春刘海民张科
Owner BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD
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