Denitration system and method which are capable of realizing direct utilization of agglomerate heat energy

Abstract

The invention provides a denitration system and a method which are capable of realizing direct utilization of agglomerate heat energy. The denitration system comprises a sintering machine, a cooling equipment, a waste heat recycling device, a dry desulfurization device, a dust collector, a blower fan, a denitration reactor, and a chimney; an exhaust gas outlet of an air bellow of the sintering machine is connected with an exhaust gas outlet of a first segment air bellow and an exhaust gas outlet of a second segment air bellow; the exhaust gas outlet of the first segment air bellow and the exhaust gas outlet of the second segment air bellow are connected with the waste heat recycling device, and then the waste heat recycling device is connected with the dry desulfurization device, the dust collector, the blower fan, and the chimney via pipelines in series connection successively; when the denitration reactor is a low-temperature denitration reactor, the denitration reactor is arranged between the blower fan and the chimney; and when the denitration reactor is a middle-temperature denitration reactor, the denitration reactor is arranged among the exhaust gas outlet of the first segment air bellow, the exhaust gas outlet of the second segment air bellow, and the waste heat recycling device. The denitration system and the method are capable of realizing direct utilization of agglomerate heat energy, low temperature denitration reaction of sintering exhaust gas is realized without consumption of extra energy, high efficiency conversion of NOx is realized, denitration rate is as high as 80 to 90%, agglomerate embrittlement is not caused, and agglomerate waste heat is recycled.

Description

technical field [0001] The invention relates to a denitrification system and method, in particular to a denitrification system and method which directly utilize the heat of sintered ore. Background technique [0002] With the development of the national economy and the improvement of people's living standards, people pay more and more attention to environmental issues. As a pollutant closely related to air quality, nitrogen oxides (NO x ) has been receiving national attention. According to the statistics of the Ministry of Environmental Protection, in 2014, the national industrial waste gas emissions of NO x A total of 14.048 million tons, while the NO emissions from ferrous metal smelting and rolling processing x It is one of the three major emission sources. [0003] The flue gas emitted by sintering machines in iron and steel enterprises (ferrous metal smelting) is the key NO x emission sources, and its denitrification has received more and more attention. The "Twelf...

AI Technical Summary

Problems solved by technology

In this case, due to the limited catalytic effect of sinter and the serious accumulation of ammonium sulfate at the rear end of waste heat recovery due to the escape of ammonia, it is necessary to control the amount of ammonia injection, which can only achieve a low denitrification efficiency; based on the practice of domestic sinter waste heat recovery, through The flue gas after sintering will carry a large amount of dust, which still exists after waste heat recovery. In this case, this flue gas is directly sent to ammonia desulfurization, which will greatly affect the solid balance of the wet desulfurization system and the crystallization of by-products, destroying The system operates stably for a long time; in addition, the flue gas temperature after wet desulfurization is around 50°C, and the lifting capacity is poor. It is easy to form a high concentration area not far from the chimney, and at present, the flue gas after wet desulfurization in China forms a large area of ​​smoke when it is discharged from the chimney. Yu, has become an issue of public concern

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