Demister unit and egr system

A technology of mist eliminator and scrubber, applied in the field of EGR system, can solve problems such as the main body of the reverse flow mist eliminator, and achieve the effect of improving the demisting efficiency

Active Publication Date: 2017-12-01
MITSUBISHI HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a concern that the water sucked into the tank from the lower part of the drain pipe may flow back into the main body of the demister.

Method used

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  • Demister unit and egr system
  • Demister unit and egr system
  • Demister unit and egr system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0051] figure 1It is a schematic diagram showing a diesel engine equipped with an EGR system to which the demister unit of the first embodiment is applied. figure 2 It is a schematic configuration diagram showing the EGR system of the first embodiment.

[0052] In the first embodiment, if figure 1 As shown, the marine diesel engine 10 includes an engine main body 11 , a supercharger 12 , and an EGR system 13 .

[0053] Such as figure 2 As shown, the engine main body 11 is a propulsion engine (main engine) that rotationally drives a propulsion propeller through a propeller shaft (not shown). The engine main body 11 is a single-flow scavenging diesel engine and also a two-stroke diesel engine, so that the flow of intake air and exhaust gas in the cylinder becomes one-way from bottom to top without exhaust residue. The engine main body 11 includes a plurality of cylinders (combustion chambers) 21 through which pistons move up and down, a scavenging manifold 22 communicating...

no. 2 Embodiment approach

[0090] Figure 5 It is a vertical sectional view showing the inlet of the demister unit of the second embodiment. In addition, the same code|symbol is attached|subjected to the member which has the same function as the above-mentioned embodiment, and detailed description is abbreviate|omitted.

[0091] In the second embodiment, if Figure 5 As shown, the demister unit 70 includes a housing 51 , a demister main body 52 , a drain pipe (drain guide) 71 , a drain discharge pipe 72 , and a water storage tank 55 .

[0092] An inlet portion 61 and an outlet portion 62 are formed in the casing 51 , and the demister main body 52 is arranged between the inlet portion 61 and the outlet portion 62 . A drain pipe 71 is provided at the lower part of the demister main body 52, and the drain pipe 71 guides the mist separated from the demister main body 52 downward. The discharge pipe 71 is composed of a straight portion 81 , a first curved portion 82 , and a second curved portion 83 . The...

no. 3 Embodiment approach

[0107] Image 6 It is a longitudinal sectional view showing the inlet of the demister unit of the third embodiment. Figure 7 It is a side view showing the connection portion of the drain tube and the drain tube. In addition, the same code|symbol is attached|subjected to the member which has the same function as the above-mentioned embodiment, and detailed description is abbreviate|omitted.

[0108] In the third embodiment, if Image 6 with Figure 7 As shown, the demister unit 90 includes a housing 51 , a demister main body 52 , a drain pipe (drain guide) 91 , a drain discharge pipe 72 , and a water storage tank 55 .

[0109] An inlet portion 61 and an outlet portion 62 are formed in the casing 51 , and the demister main body 52 is disposed between the inlet portion 61 and the outlet portion 62 . A drain pipe 91 is provided at the lower portion of the demister main body 52 , and the drain pipe 91 guides the mist separated from the demister main body 52 downward. The disc...

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Abstract

By providing a demister unit and EGR system with a casing (51), which has a hollow shape and is provided with an exhaust gas inlet portion (61) and outlet portion (62), a demister body (52), which removes mist from exhaust gas in the casing (51), a drain pipe (drain guide portion) (53), which is connected to the bottom of the demister body (52) and guides the mist separated by the demister body (52) downward, and a water storage portion (seal portion) (67), which prevents the exhaust gas from flowing from the drain pipe (53) into the demister body (52), the backflow of water from the drain guide portion to the demister body is suppressed and an improvement in mist removal efficiency is achieved.

Description

technical field [0001] The present invention relates to a demister unit for removing mist from exhaust gas, and an EGR system to which the demister unit is applied. Background technique [0002] Since the exhaust gas discharged from the boiler via the wet exhaust gas treatment device contains mist, it is necessary to remove the mist contained in the exhaust gas. As a device for removing mist contained in exhaust gas, there are, for example, a demister and a mist eliminator described in Patent Document 1 below. The wet exhaust gas treatment device described in this patent document 1 introduces the exhaust gas from the boiler into the dust removal tower from the inlet flue, and after removing the coal dust in the exhaust gas, the exhaust gas is treated when the exhaust gas passes through the dedusting tower demister. Remove the fog in it. [0003] Additionally, there is Exhaust Gas Recirculation (EGR) to reduce NOx in the exhaust. Such EGR returns part of the exhaust gas di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D45/08B01D47/10F02M26/35F01N3/04
CPCB01D45/08B01D47/10F01N3/04F02M26/35
Inventor 中川贵裕平冈直大伊藤和久
Owner MITSUBISHI HEAVY IND LTD
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