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Waste gas recirculation method and device based on desulfurization tower for ship diesel engine

A technology for marine diesel engine and exhaust gas recirculation, which is applied in the fields of marine diesel engine exhaust gas recirculation and marine diesel engine exhaust gas recirculation system, can solve the problems of high cost, complicated installation, large renovation cost, etc., and achieves simple installation, low cost, and NOx reduction. The effect of emissions

Pending Publication Date: 2018-07-06
HUDONG HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the conventional solution using EGR technology requires a large modification of the main engine, and requires a large investment in modification costs, and has the disadvantages of cumbersome processes, complicated devices, and high costs.

Method used

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  • Waste gas recirculation method and device based on desulfurization tower for ship diesel engine
  • Waste gas recirculation method and device based on desulfurization tower for ship diesel engine
  • Waste gas recirculation method and device based on desulfurization tower for ship diesel engine

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Effect test

Embodiment 1

[0022] see figure 2 , the diagram shows that the exhaust gas recirculation device for marine diesel engines based on the desulfurization tower includes a desulfurization tower 1, a bypass valve 2, a diesel exhaust pipe a, an exhaust pipe b and a return pipe c.

[0023] The desulfurization tower 1 is installed downstream of the marine diesel engine, and communicates with the exhaust header of the marine diesel engine through the diesel engine exhaust pipe a, so as to discharge all exhaust gas from the marine diesel engine in the desulfurization tower 1. Desulfurization washing. The exhaust pipe b is connected to the top of the desulfurization tower 1 to discharge 70% of the desulfurized waste gas to the atmosphere. The bypass valve 2 is arranged at the bypass flue opening of the desulfurization tower 1, one end is connected to the desulfurization tower 1, and the other end is connected to the suction end of the turbocharger of the marine diesel engine through the return pipe ...

Embodiment 2

[0029] The structure of this embodiment is basically the same as that of Embodiment 1, except that a fan is also included. see image 3 , the figure shows that the marine diesel exhaust gas recirculation device based on the desulfurization tower includes a desulfurization tower 1, a bypass valve 2, a fan 3, a diesel engine exhaust pipe a, an exhaust pipe b, and a return pipe c; the fan 3 is installed in the bypass The downstream of the valve 2 is connected between the bypass valve 2 and the air return pipe c for forcibly pressurizing the desulfurized exhaust gas. The air return pipe c is directly connected to the scavenging manifold of the marine diesel engine.

[0030] During operation, the fan 3 forcibly pressurizes the desulfurized waste gas after the bypass valve 2, and sends about 30% of the bypassed desulfurized waste gas to the scavenging header of the diesel engine through the return pipe c, and the scavenging gas The fresh air in the header mixes and again participat...

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Abstract

The invention discloses a waste gas recirculation method and device based on a desulfurization tower for a ship diesel engine. The ship diesel engine comprises an exhaust header and a scavenging header; the method is characterized in that all waste gas discharged by the ship diesel engine enters the desulfurization tower for desulfurization and washing, then 30% of the waste gas enters the scavenging header again to be mixed with fresh air in the scavenging header so as to reduce concentration of O2 in the fresh air, so that the peak temperature of fuel combustion is reduced, generation of NOxemissions is reduced, then 30% of the waste gas participates in a combustion cycle of the ship diesel engine again, and therefore combined emission reduction of SOx and NOx is realized. The waste gasrecirculation method and device have the advantages of being stable and reliable, simple in device and low in cost, and are suitable for marine medium-low-speed diesel engines provided with a turbocharger or not.

Description

technical field [0001] The invention relates to a marine diesel engine exhaust gas recirculation system, in particular to a marine diesel engine exhaust gas recirculation method and device based on a desulfurization tower, and belongs to the technical field of diesel engines. Background technique [0002] With the development of the international shipping industry and ocean-going shipping, exhaust emissions from marine engines fueled by diesel fuel have become a major source of pollution in the ocean, especially in port areas. The fuel used by marine diesel engines is heavy oil with high viscosity, high sulfur content, and high carbon residue. Among the gaseous emissions produced by it, sulfur oxides (SOx) and nitrogen oxides (NOx) account for a large proportion. The pollution of sulfur oxides and nitrogen oxides in marine diesel engine exhaust to the atmospheric environment has aroused widespread concern in the international community. [0003] In recent years, the Interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/34F02M26/35
Inventor 冯亮王涛吴璇
Owner HUDONG HEAVY MACHINERY
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