A method for denitration of coke oven flue gas

A coke oven and flue gas technology, applied in the field of air pollutant control, can solve the problems of low denitrification efficiency, achieve the effects of reducing emissions, reducing original emission concentrations, and simplifying equipment layout

Active Publication Date: 2019-10-11
SOUTHEAST UNIV
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Problems solved by technology

[0006] Purpose of the invention: The present invention aims at the problem of low denitrification efficiency due to low temperature when using the conventional SCR denitrification method for coke oven flue gas, and provides a denitrification method for coke oven flue gas by combining coke oven flue gas and coking process characteristics

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  • A method for denitration of coke oven flue gas

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Embodiment Construction

[0032] Below by embodiment, can understand the present invention better. However, those skilled in the art can easily understand that the content described in the embodiments is only for illustrating the present invention, and should not and will not limit the present invention described in the claims.

[0033] This example is aimed at 2×65 hole coke ovens, and the flue gas production of a single coke oven is 150000Nm 3 / h, flue gas temperature 260°C, original emission concentration of nitrogen oxides 1000mg / Nm 3 . The denitrification process steps are as follows (such as figure 1 shown):

[0034] (1) Put the coke powder with a particle size range of 0.5-10mm in the coking workshop in a cross-flow bed, and at the same time pass the coke oven flue gas with a temperature of about 260 °C through the bed, most of the tar, some sulfides and coke dust Physically adsorbed by the coke powder, the adsorbed coke powder returns to the coking workshop as a takeaway product, while the ...

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Abstract

The invention discloses a denitrification method of coke oven smoke. The denitrification method of the coke oven smoke comprises physical adsorption, empty smoke mixing, combustion reaction, smoke-smoke mixing, evaporation mixing, denitrification reaction, water vapor heat transfer and gas-gas heat transfer. The denitrification method of the coke oven smoke comprises the following steps: using coke powder to adsorb impurities of the coke oven smoke to be subjected to denitrification such as tar, making a part of the coke oven smoke mixed with heated air, and carrying out a low-nitrogen combustion reaction with coke oven gas to generate high-temperature smoke, then directly contacting with water vapor atomized ammonia droplets to form a reaction suitable ammonia / smoke mixture, then performing a denitrification reaction to remove most of nitrogen oxides, and making the smoke exchange heat with feed water and air through a heat exchanger successively, wherein the former becomes water vapor after absorbing heat, one part of the water vapor is used as an atomizing medium and the other part is returned to a coking plant, and the latter is mixed with the coke oven smoke after heated, finally purified smoke is discharged to atmosphere. The method adopts low-nitrogen combustion of smoke recirculation and direct injection of ammonia water to realize high-efficiency denitrification of coke oven smoke SCR, and has the advantages of compact system, high efficiency and energy saving and product recycling.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, and in particular relates to a coke oven flue gas denitrification method. [0002] technical background [0003] With the introduction of the latest "Emission Standard of Pollutants for Coking Chemical Industry" (GB16171-2012), coke oven flue gas must be denitrified by more advanced denitrification process to meet stricter nitrogen oxide emission requirements. At present, SCR denitrification technology has been proven to be one of the most efficient flue gas denitrification technologies in the power industry, but this technology requires the flue gas temperature to reach the temperature window, and the flue gas cannot contain components and substances that block or poison the catalyst. Due to the particularity of the coking process, coke oven flue gas often has a low temperature (<300°C) and contains tar components. If the conventional SCR denitrification technology is directly us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56B01D46/30F27D17/00
CPCB01D46/30B01D53/8625B01D53/90B01D2251/2062B01D2258/0283F27D17/004Y02P10/25
Inventor 张勇金保昇
Owner SOUTHEAST UNIV
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