Urea powerful mixing device for SCR system of small and medium-sized ship

A technology of SCR system and mixing device, applied in muffler device, exhaust device, engine components, etc., can solve the problems of uneven mixing of urea spray and flue gas, deviation of inlet speed of SCR catalyst, and low urea pyrolysis efficiency, etc. Achieve the effect of improving deposition phenomenon, prolonging equipment service life and improving denitration performance

Active Publication Date: 2016-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the uneven mixing of urea spray and flue gas in the existing SCR system, low urea pyrolysis efficiency and easy generation of deposits, large pressure drop, SCR catalytic converter inlet velocity deviation and NH 3 / NO X To provide a powerful urea mixing device for the SCR system of small and medium-sized ships due to defects such as large concentration deviation

Method used

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  • Urea powerful mixing device for SCR system of small and medium-sized ship
  • Urea powerful mixing device for SCR system of small and medium-sized ship
  • Urea powerful mixing device for SCR system of small and medium-sized ship

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Embodiment 1

[0027] A powerful urea mixing device for small and medium-sized ship SCR systems, such as Figure 4 As shown, the device includes a pipe body and a perforated plate installed in the pipe body from bottom to top, a urea nozzle 4 and a mixer, the rectification device is a perforated plate 3 distributed with a plurality of circular holes, and the turbulent flow The device is a mixer 5, on which four cross-shaped fins are fixed, and the fins are formed by interlacing two flat plates. The perforated plate is installed 340cm upstream of the urea nozzle, and the mixer is installed 500cm downstream of the urea nozzle. The perforated plate, urea nozzle and mixer are sequentially arranged in the pipeline along the direction of flue gas flow. A connecting flange 1 for connecting with the SCR system is welded on the pipe body.

[0028] For the structure of perforated plates, see figure 1 , The perforated plate is made of a circular steel plate with a diameter of 330mm and a thickness o...

Embodiment 2

[0033] A powerful urea mixing device for small and medium-sized ship SCR systems, such as Figure 4 As shown, the device includes a pipe body and a perforated plate installed in the pipe body from bottom to top, a urea nozzle 4 and a mixer, the rectification device is a perforated plate 3 distributed with a plurality of circular holes, and the turbulent flow The device is a mixer 5, on which four cross-shaped fins are fixed, and the fins are formed by interlacing two flat plates. The perforated plate is installed 200cm upstream of the urea nozzle, and the mixer is installed 300cm downstream of the urea nozzle. The perforated plate, urea nozzle and mixer are sequentially arranged in the pipeline along the direction of flue gas flow. A connecting flange 1 for connecting with the SCR system is welded on the pipe body.

[0034] For the structure of perforated plates, see figure 1 , The perforated plate is made of a circular steel plate with a diameter of 300mm and a thickness o...

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Abstract

The invention relates to the field of ship flue gas denitrification equipment, in particular to a urea powerful mixing device for an SCR system of a small and medium-sized ship. The urea powerful mixing device for the SCR system of the small and medium-sized ship comprises a tube body, a porous plate, a urea nozzle and a mixing device, wherein the porous plate, the urea nozzle and the mixing device are arranged in the tube body from bottom to top; a flow rectifying device is the porous plate where a plurality of round holes are distributed, and a flow disturbing device is the mixing device; and the device has the beneficial effects that the flow rectifying device (porous plate) is arranged at the upstream position of the urea nozzle, the flow disturbing device is arranged at the downstream position of the urea nozzle, and due to the structure, smoke and sprayed urea mist can be more sufficiently mixed in the limited space, the urea nozzle can absorb more smoke gas waste heat in a short time so as to improve the decomposition speed, and therefore it can be ensured that the concentration ratio of NH3/NOX meets the reaction requirement when mixed smoke gas enters an SCR reactor inlet.

Description

technical field [0001] The invention relates to the field of ship flue gas denitrification equipment, in particular to a urea powerful mixing device used in the SCR system of small and medium-sized ships. Background technique [0002] With the advancement of air pollution control work, the discharge of ship pollutants has gradually become prominent and has received attention. The International Maritime Organization (IMO) Marine Environment Protection Committee (MEPC) amended Annex VI of the International Convention for the Prevention of Pollution Caused by Ships (MERPOL) in October 2008, and the nitrogen oxides emitted by ships when navigating in offshore emission restriction areas Emissions put forward stricter standards, requiring nitrogen oxide emissions to meet Tier III standards, in order to maintain the atmospheric environment in offshore sea areas and protect the health of coastal residents. [0003] Selective Catalytic Reduction (Selective Catalytic Reduction, SCR) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28
CPCF01N3/2066F01N2590/02
Inventor 高翔竺新波郑成航王耀霖岑可法骆仲泱倪明江周劲松翁卫国吴卫红张涌新宋浩张玉嵩黄彧
Owner ZHEJIANG UNIV
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