Gasification coupling low-NOx combustion system and method and design method

Abstract

The invention discloses a gasification coupling low-NOx combustion system and method and a design method. The system comprises a semi-collision semi-tangent-circle gasification furnace, a rich-lean separator and a flow-down combustion chamber; the semi-collision semi-tangent-circle gasification furnace is sequentially provided with a semispherical top cover, an airflow guide table, burners, a cylindrical main body and a conical barrel from top to bottom, and a gasification furnace product outlet is formed in the bottom of the conical barrel; the whole rich-lean separator is arranged in the horizontal direction, and an inlet of the rich-lean separator is communicated with the gasification furnace product outlet; a rich-phase product outlet and a lean-phase product outlet of the rich-lean separator are communicated with the flow-down combustion chamber; and the number of the burners is four, two burners are only arranged in a 180-degree collision manner, and the other two burners are offset by a set angle in the diameter direction of a circle where the burners are located. Based on the idea of decoupling combustion, the technical idea of entrained-flow bed gasification is introducedinto a solid fuel preheating combustion technology, a gasification reaction is promoted, and after gasification, reducing gas in a gas phase can reduce nitrogen oxide generated by combustion of a rich-phase product.

Description

technical field [0001] The invention belongs to the technical field of combustion, and in particular relates to a gasification coupling low NOx combustion system, a low NOx combustion method and a design method. Background technique [0002] Coal is the main primary energy source and the main driving force for rapid economic development. At present, the main way of coal utilization is direct combustion, but the direct combustion of coal will produce a series of pollutants, including NOx, SOx and particulate matter, which will cause great harm to human body and environment. Among them, NOx is particularly difficult to deal with and has become a key control object. Before 2020, the emission concentration of nitrogen oxides should not exceed 50mg / Nm for coal-fired units. 3 . Existing out-of-stock technologies, including low-nitrogen burner design, air staging technology, fuel staging technology, rich-thin deviation combustion, low-oxygen combustion, selective catalytic reduct...

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Problems solved by technology

Existing out-of-stock technologies, including the design of low-nitrogen burners, air staging technology, fuel staging technology, rich-thin deviation combustion, low-oxygen combustion, selective catalytic reduction technology SCR and non-selective catalytic reduction technology SNCR, etc., meet this standard. Investment and operating costs are still very expensive

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