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SNCR (selective non-catalytic reduction) denitration nozzle and spraying method

A nozzle and denitrification technology is applied in the field of flue gas denitrification of circulating fluidized bed boilers, which can solve the problems of unadjustable atomization shape, and achieve the effects of increasing utilization rate, reducing ammonia escape, and improving denitration efficiency.

Pending Publication Date: 2022-01-14
TSINGHUA UNIV +1
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Problems solved by technology

[0005] At present, in the SNCR denitrification process adopted by circulating fluidized bed boilers, the denitrification parameters are only adjusted by changing the flow rate of the reducing agent. The reducing agent nozzles are all fixed structures, and the atomized shape of the reducing agent solution formed after being sprayed out not adjustable

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  • SNCR (selective non-catalytic reduction) denitration nozzle and spraying method
  • SNCR (selective non-catalytic reduction) denitration nozzle and spraying method
  • SNCR (selective non-catalytic reduction) denitration nozzle and spraying method

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Embodiment Construction

[0034]The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated reactor Or elements mu...

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Abstract

The invention discloses an SNCR denitration nozzle and a spraying method. The denitration nozzle comprises a nozzle shell, a fixed block, a sliding part and a rotating part; the nozzle shell comprises a straight cylinder section and a conical cylinder section which are integrally formed, a reducing agent solution inlet is formed in one end of the straight cylinder section, and in the direction away from the straight cylinder section, one end of the conical cylinder section is shrunk to form a reducing agent solution nozzle; the fixed block is fixed in a cavity formed by the nozzle shell; the sliding part comprises a sliding rod, a solution blocking plate, a spring and an atomization adjusting head; and the rotating part comprises a blade guide block and a rotating blade. Through an autonomously adjustable reducing agent nozzle structure, the spraying flow velocity and the atomization angle of a reducing agent solution in a flue are realized under different reducing agent solution flow conditions, so that the mixing of the reducing agent solution and NOx in flue gas is facilitated, the utilization rate of the reducing agent solution is increased under different loads of a boiler, the denitration efficiency is improved, and the ammonia escape amount is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification of circulating fluidized bed boilers, and in particular relates to an SNCR denitrification nozzle and a spraying method. Background technique [0002] Circulating fluidized bed boiler has the advantages of wide fuel adaptability, strong load regulation ability, high combustion efficiency and low pollutant emission, and has been developed rapidly in my country in recent decades. Due to the uniform medium-temperature combustion mode in the furnace of the CFB boiler, and there are a large amount of reducing circulating materials in the furnace, the nitrogen oxides (NO x ) has inherent advantages in the control of emissions, and in general the NO x The original emission concentration is controlled at 300mg / m 3 within. As my country's environmental protection standards continue to become stricter, the new ultra-low emissions require all coal-fired units to implement NO x Emission c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/79B01D53/56B01D2258/0283
Inventor 周托刘青卢炜钦
Owner TSINGHUA UNIV
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