Water treatment system for marine low speed diesel engine egr

Abstract

The invention discloses a water treatment system for EGR (Exhaust Gas Recirculation) of a marine low speed diesel engine. The water treatment system comprises a circulating water buffer tank for providing circulating water for the EGR, a NaOH solution tank for providing a NaOH solution for the EGR, and a control system for automatically controlling treatment, supplementation, discharge and detection of the circulating water and the NaOH; the circulating water buffer tank is connected with the EGR and has liquid level alarming, automatic liquid level control, automatic circulating water supplementing, extremely high liquid level overflowing, forced discharging and automatic water turbidity monitoring and control functions; the NaOH solution tank is connected with the EGR and has liquid level alarming, automatic liquid level control, automatic filling and supplementing and automatic temperature control functions; the control system is connected with and controls the circulating water buffer tank to realize automatic circulating water supplementing, liquid level alarming, automatic liquid level control and water turbidity monitoring and automatic control, and is connected with and controls the NaOH solution tank to realize automatic filling and supplementing of the NaOH solution, liquid level alarming, automatic liquid level control, temperature monitoring and automatic temperature control. The water treatment system solves the problem on supplying of the circulating water and the NaOH solution of the EGR and has the advantages of compact structure, high control precision andautomatic operation.

Description

technical field [0001] The invention relates to a low-speed marine diesel engine, in particular to a water treatment system for EGR of a low-speed marine diesel engine, and belongs to the technical field of diesel engines. Background technique [0002] With the increasingly stringent environmental protection requirements, according to the Tier III regulations of the International Maritime Organization, when ships built after January 1, 2016 operate in the nitrogen oxide emission control area (NOx-ECAs), for the main engine whose speed is lower than 130rpm, it is required The periodic value of nitrogen oxide emission must be lower than 3.4g / kwh, and the emission value under each load point must not exceed 5.1g / kwh. That is to say, compared to Tier II, the nitrogen oxide emissions of Tier III are reduced by 76%. At present, conventional ME-type hosts usually can only meet the Tier II emission specifications, but cannot meet the requirements of Tier III specifications. Theref...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the existing EGR water treatment system, provide a kind of water treatment system for marine low-speed diesel engine EGR, solve the supply, storage, monitoring and treatment problems of EGR unit circulating water and NaOH solution when moving trains , using intelligent logic control to achieve the effects of compact structure, improved control accuracy and automatic operation

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