Selective non-catalytic reduction method with added gasified biomass gas and used boiler

A technology of biomass and gasification gas, applied in chemical instruments and methods, separation methods, lighting and heating equipment, etc., can solve the problems of low denitrification rate, narrow temperature window, single active ingredient, etc., and achieve simple boiler system, high temperature The effect of wide window and wide distribution
CN101433800AInactive Publication Date: 2009-05-20HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2009-05-20
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention relates to a selective non-catalytic reduction method with the addition of biomass gasified gas and a boiler used by the same, which relate to the selective non-catalytic reduction method and the boiler used by the same. The invention solves the problems that the prior selective non-catalytic reduction method has narrow temperature window, low denitration efficiency at a low temperature region and single effective component in synthesis gas of a reaction additive. A plurality of spraying ends of a plurality of gas additive spraying devices of the boiler pass through the lateral wall of a horizontal flue and are arranged in the horizontal flue. The selective non-catalytic reduction method pressurizes the biomass gasified gas generated by a biomass gasifier, sprays the pressurized gas into a furnace chamber and a horizontal flue in a region with a temperature of between 800 and 950 DGE C through a biomass gasified gas spaying device, wherein the mol ratio of the total spraying amount of the biomass gasified gas to NOx in the flue gas before the biomass gasified gas is sprayed is between 0.3 and 1.2. The selective non-catalytic reduction method makes use of biomass resources to improve the denitration efficiency and enlarges the temperature window. The boiler system of the invention is simple and has high reliability.
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Description

technical field

[0001] The invention relates to a selective non-catalytic reduction method and a used boiler. Background technique

[0002] Nitrogen oxides (NOx) are one of the main air pollutants emitted by coal-fired boilers. In addition to forming acid rain and destroying the ecological environment, they can also form photochemical smog, which directly endangers human health. Since July 1, 2004, the state has charged 0.6 yuan per pollution equivalent of nitrogen oxides (the equivalent of nitrogen oxides is 0.95 kilograms) to directly charge the units that emit pollutants. It is imminent to control NOx emissions from coal-fired boilers. Currently controlling NO X Emission measures can be roughly divided into two categories, one is low NO X Combustion technology mainly includes low excess air operation technology, flue gas recirculation technology, thick-lean combustion technology and reburning combustion technology, etc. The cost of reburning technology at low NO X It...

Claims

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