Bitangent circle reactor applied to urea pyrolysis to produce ammonia

Abstract

The invention discloses a bitangent circle reactor applied to urea pyrolysis to produce ammonia. The bitangent circle reactor comprises a urea solution inlet and a decomposition product outlet, wherein the urea solution inlet and the decomposition product outlet are respectively formed in the upper part and the lower part of the reactor body, two groups of gas inlets for introducing air or smoke are formed in a lateral side of the reactor body, the two groups of the gas inlets of the reactor body are respectively distributed along an upper lateral wall and a lower lateral wall of the reactor body according to a rotational flow tangent circle, the tangent circle directions of the upper gas inlets and the lower gas inlets are opposite to each other, a zooming section is arranged in the middle section of the reactor body, an inner wall of the zooming section is of an annular corrugated structure, the outer side of the reactor body is wrapped by a plurality of groups of heating electric resistance wires from top to bottom, each group of heating electric resistance wires are respectively connected with a corresponding temperature control device, the reactor body is an aluminum cylinder,the zooming section is arranged between the solution inlet and the product outlet, and the inner wall of the zooming section of the reactor is of the annular corrugated structure. The bitangent circle reactor disclosed by the invention can effectively improve the ammonia producing efficiency through urea pyrolysis, reduce pyrolysis energy consumption and achieve both low cost and high efficiency.

Description

technical field [0001] The invention belongs to the field of flue gas purification and denitrification devices, and relates to a pyrolysis reactor for pyrolyzing urea solution to generate ammonia gas for removing nitrogen oxides in flue gas of a coal-fired boiler, in particular to a pyrolysis of urea for ammonia production double tangential circular reactor. Background technique [0002] my country's nitrogen oxides (NO x ) emissions are huge, resulting in increasingly prominent environmental problems. Common flue gas denitrification technologies include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). In the SCR and SNCR denitrification process, the reducing agent ammonia (NH 3 ) mainly comes from liquid ammonia, ammonia water and urea. Among them, urea has the advantages of high safety, non-toxic and harmless, and easy transportation and storage, so it has been favored by more and more people. [0003] The existing method for producing...

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Problems solved by technology

If the distribution of the gas flow field and temperature field is uneven, it will lead to insufficient pyr

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