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A method and device for compound denitrification

A denitration and waste gas technology, applied in the field of compound denitration, can solve problems such as increasing denitration cost, and achieve the effects of avoiding incomplete combustion of fuel, reducing denitration cost, and improving denitration reaction efficiency.

Active Publication Date: 2018-04-24
SHANXI UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influence of the combustion method caused by fuel staging still exists, and studies have shown that the accelerator used in this method is sodium hydroxide powder or solution, and natural gas is used as refueling gas, which increases the cost of denitrification

Method used

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  • A method and device for compound denitrification

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Embodiment approach

[0040] The implementation method is as follows: the analytical gas produced by the analytical gas source in the ammonia synthesis process is pressurized by the first pressurizing device 16, flows through the reducing waste gas delivery pipe and the reducing waste gas separation valve 17, and is separated through the separation valve 17, according to 4: The ratio of 1 flows into the reducing exhaust gas pipeline a and the reducing exhaust gas pipeline b; the reducing exhaust gas pipeline a is connected to the first nozzle 12, and this part of the analytical gas is sprayed into the reburning zone 8, and the temperature range of the interval is between 1100 ° C and 1300°C, the amount of desorption gas added is represented by the molar ratio of the amount of effective reducing substances in the desorption gas to the main combustion fuel. The preferred value is 0.2~0.3. The two nozzles 13 communicate, and enter the reburning zone 8 as secondary air; the reducing waste gas pipeline b...

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Abstract

The invention relates to the technical field of boiler improvement, in particular to a composite denitration method and device suitable for power station boilers, industrial boilers and other burning devices. A method is provided, reducibility industrial waste gas serves as a composite additive, on one hand, the reducibility industrial waste gas serves as reburning gas to reduce nitric oxide in the reducing atmosphere, the amount of nitric oxide generated through burning is reduced; and on the other hand, the SNCR reaction temperature is reduced, the SNCR proper temperature area is widened, the reduction of nitric oxide through SNCR is promoted, accordingly, the denitration rate is increased, and ammonia leakage is reduced. The industrially-common reducibility waste gas is effectively and resourcefully utilized, meanwhile, the burning denitration efficiency of a boiler is improved from two aspects, and the emission load of nitric oxide is reduced by more than 80%. The boiler equipment is simple, implementation is easy, the adopted additive is low in price and easy to obtain, the burning process in the boiler is not affected, obvious secondary pollution cannot be generated, and reliability is high. The method is mainly applied to the industrial waste gas reutilization and nitric oxide control aspects.

Description

technical field [0001] The invention relates to the technical field of boiler improvement, and more specifically relates to a compound denitrification method and device suitable for combustion equipment such as power plant boilers and industrial boilers. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants emitted by coal-fired boilers. Coal-fired power plant boilers, that is, industrial boilers, emit a large amount of nitrogen oxides, which seriously damages the ecological environment and threatens human health. The increasingly stringent environmental regulations require the research and development of advanced technologies to reduce emissions of pollutants such as NOx. At present, there are two types of measures to control NOx emissions, one is the low NOx combustion technology in the coal combustion process, and the other is the flue gas denitrification technology after combustion to control its formation or reduce it. [0003] Low NOx...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23B90/06F23L7/00F23L9/00B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2062B01D2258/0283F23B90/06F23L7/00F23L9/00
Inventor 娄慧如王菁程芳琴王宝凤熊英莹
Owner SHANXI UNIV
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