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Ash blower and ash blowing method for marine SCR reactor

An SCR reactor and soot blowing device technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of inability to blow off the catalyst surface, blocking the catalyst porous channels, poor reliability of the soot blowing system, etc. The effect of improving soot blowing efficiency, saving equipment cost and improving service life

Active Publication Date: 2020-11-10
WUXI DONGFANG HIGH PERFORMANCE SHIP ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 2. Selective Catalytic Reduction (SCR, Selective Catalytic Reduction) system can effectively reduce diesel engine NO x However, particulate matter such as soot in diesel engine exhaust gas and ammonium sulfate formed in the SCR system tend to accumulate on the surface of the catalyst in the SCR reactor, and even block the porous channels of the catalyst, causing the catalyst to lose its activity and reduce its catalytic activity.
The conventional reactor soot blowing system cannot quickly and effectively blow off the attachments on the surface of the catalyst, and the pressure stabilization time is short, so the reliability of the soot blowing system is poor

Method used

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  • Ash blower and ash blowing method for marine SCR reactor
  • Ash blower and ash blowing method for marine SCR reactor
  • Ash blower and ash blowing method for marine SCR reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 is a soot blowing device for an SCR reactor.

[0036] figure 1 It is a structural schematic diagram of an embodiment of the soot blowing device in the present invention. figure 2 for figure 1 Schematic diagram of the structure of the middle catalyst layer, soot blowing main pipe and soot blowing branch pipe. image 3 for figure 1 Schematic diagram of the structure of the first catalyst layer and the corresponding soot blowing main pipe and soot blowing branch pipe.

[0037] Such as Figure 1 ~ Figure 3 As shown, the SCR reactor 1 in Example 1 includes a first catalyst layer 9 , a second catalyst layer 10 and a third catalyst layer 11 arranged from top to bottom. The soot blowing device for the SCR reactor 1 includes a compressed medium storage tank 2, a filter 3, an air guide pipe frame 6 and a soot blowing pipe.

[0038] The compressed medium storage tank 2 is used to apply pressure conditions to the compressed gas and store it. The compressed gas ...

Embodiment 2

[0049] Embodiment 2 is a soot blowing device used in an SCR reactor. The difference between embodiment 2 and embodiment 1 is that the SCR reactor 1 in embodiment 2 is only provided with two catalyst layers, the first catalyst layer 9 and the second catalyst layer 10 from top to bottom.

[0050] Correspondingly, there are two airway tube frames 6 . The air inlets of the two air guide pipe frames 6 are connected in parallel to the air outlet of the filter 3 through the compressed medium pipe 5, which can ensure that the first catalyst layer 9 and the second catalyst layer 10 in the SCR reactor 1 are purged and cleaned at the same time.

[0051] In Embodiment 2, preferably, the soot blowing nozzle 12 has a variable diameter. Along the radial direction of the soot blowing main pipe 14, from the connection between the soot blowing main pipe 14 and the soot blowing branch pipe 8 to the direction away from the connection between the soot blowing main pipe 14 and the soot blowing bra...

Embodiment 3

[0054] Embodiment 3 is a soot blowing device for an SCR reactor. On the basis of Embodiment 1 or Embodiment 2, a differential pressure sensor 4 is provided between the inlet and the outlet of the SCR reactor 1 in Embodiment 3. There is also a data acquisition and monitoring system. And an electromagnetic valve 7 is installed at the air outlet of the air guide tube frame 6 . The electrical signal of the differential pressure sensor 4 is used to control the opening and closing of the solenoid valve 7. The data acquisition and monitoring system is connected to the differential pressure sensor 4 and the electromagnetic valve 7 of each air guide pipe frame; when the detection value of the differential pressure sensor 4 exceeds the specified value, the data acquisition and monitoring system controls the electromagnetic valve 7 to open, so that the soot blowing device starts to work, and the catalyst layer Perform soot blowing.

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Abstract

The invention relates to an ash blower and an ash blowing method for a marine SCR reactor. According to the ash blower, a plurality of catalyst layers are arranged in the reactor; the ash blowing device comprises a plurality of air guide pipe frames; each air guide pipe frame is communicated with a group of air blowing pipes; the air blowing pipes are arranged below each catalyst layer; the air blowing pipe comprises a ash blowing main pipe and ash blowing branch pipes; the air guide pipe frame is communicated with one end of the ash blowing header pipe; at least one ash blowing branch pipe isrotatably fixed at the other end of the ash blowing header pipe; and ash blowing nozzles which face upwards and are perpendicular to the cross section of the catalyst layer are arranged on the ash blowing branch pipes. A compressed medium is adopted for powerful purging in the vertical direction, so that the device is high in pertinence, wide in coverage area, free of dust removal dead angles andthe like; the service life of the catalyst can be prolonged, the replacement period of the catalyst is prolonged, and therefore denitration efficiency is improved and operation cost is saved.

Description

technical field [0001] The invention relates to a treatment device for marine diesel engine tail gas, in particular to a soot blowing device and a soot blowing method for a marine SCR reactor. Background technique [0002] 1. Environmental problems caused by global warming and air pollution have led to increasingly stringent controls on combustion emissions from power machinery. In the field of marine transportation, with the development of international shipping and ocean-going shipping, the exhaust gas produced by diesel-fueled marine engines has become a major source of pollution in coastal areas, especially ports. NO in Exhaust Gas from Marine Diesel Engines x Pollution to the atmospheric environment has aroused widespread concern in the international community. According to the latest regulations of the International Maritime Organization (IMO), since 2016, new ships in NO x Emission Control Areas (NECAs) must meet Tier III emission requirements. [0003] 2. Selecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56
CPCB01D53/9409
Inventor 黄泉水於克良刘少俊崔梦祺
Owner WUXI DONGFANG HIGH PERFORMANCE SHIP ENG