Composite device for aftertreatment of ship low-speed diesel engine end gas

A tail gas post-treatment and composite device technology, which is applied in the field of diesel engine systems, can solve problems such as reactor fouling and wastewater treatment, and achieve energy saving and high removal efficiency.

Active Publication Date: 2016-07-20
HARBIN ENG UNIV
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Problems solved by technology

The flue gas heating method described in this plan requires large-scale equipment such as heat exchangers. For ships with high space utilization, it is not feasible to change the flue gas heating method, and it is not suitable for denitri

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  • Composite device for aftertreatment of ship low-speed diesel engine end gas

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Embodiment Construction

[0016] Hereinafter, the present invention will be described in more detail with examples in conjunction with the drawings:

[0017] Combine figure 1 , The composite device for post-treatment of exhaust gas of low-speed marine diesel engine of the present invention mainly includes: SCR denitration system and wet scrubbing system. The denitration system mainly includes: SCR reactor 11, mixer 10, evaporator 15, compressed air source 18, urea supply unit 20, blower 13, burner 14, conversion valve and connecting pipeline; washing system includes: washing tower 28, Venturi scrubber 27, heat exchanger 34, wastewater treatment unit 32, supply pumps for sea water, lye and circulating liquid, and connecting pipes and sensors. It is characterized in that the turbine bypass pipeline 39 is connected to the outlet pipeline of the turbine 6 through the bypass valve 5, and the turbine 6 is connected to the SCR reactor 11 through the outlet pipeline 42 through the reactor sealing valve 7 and the...

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Abstract

The invention provides a composite device for aftertreatment of ship low-speed diesel engine end gas. The composite device comprises a denitration system and a washing system. A diesel engine is connected with an gas inlet header through a gas inlet pipe, the gas inlet header is connected with a gas compressor through a rear pipeline of the gas compressor, the diesel engine is connected with a gas outlet header through a gas outlet pipe, the gas outlet header is connected with an inlet of a turbine through a front pipeline of the turbine, an outlet of the turbine is connected with an outlet pipeline, and the outlet pipeline is connected with the denitration system and the washing system. According to the composite device, an SCR (selective catalytic reduction) system is positioned in rear of a turbocharger to facilitate flexible arrangement of an SCR device, the temperature of front end gas of a reactor is increased by bypassing front high-temperature end gas of the turbine, energy consumption is lowered, and sediments in the reactor is removed through afterburning and temperature increasing of backflow end gas. The composite device has the advantages that removal efficiency for pollutants of NOx, SO2 and particles is high, limit values of emission regulations specified by domestic and abroad organizations such as IMO (international meteorological organization) can be met, and operation mode switching of ships in international waters and emission-controlled regions during sailing can be achieved.

Description

Technical field [0001] The invention relates to a diesel engine system, specifically a diesel engine tail gas treatment device. Background technique [0002] In recent years, with the rapid development of the shipbuilding industry, the content of NOx, SO2 and particulate matter emitted by its power plants has further increased, and the requirements for the control of exhaust emissions have become more and more stringent. The NOx, SO2 and particulate matter discharged into the air from marine main and auxiliary engines, oil-fired boilers and incinerators will cause great harm to humans and the environment. The Chinese government has also formulated relevant regulations for the emission of ship exhaust pollutants. The core port area within the emission control area is determined. [0003] The measure used to remove nitrogen oxides in the tail gas of ships' low-speed engines is usually high-pressure SCR before the turbine. The exhaust temperature is relatively high, which meets the r...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01D53/50B01D53/56B01D53/92B01D47/10F01N3/20
CPCB01D47/10B01D53/504B01D53/92B01D53/9418B01D53/9431B01D2258/012F01N3/2066Y02T10/12
Inventor 周松周金喜朱元清王占广高瑞锋
Owner HARBIN ENG UNIV
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