Device based on injection pump and used for realizing emulsifying combustion of supercharged diesel engine and reducing NOx emission

Abstract

The invention aims to provide a device based on an injection pump and used for realizing emulsifying combustion of a supercharged diesel engine and reducing NOx emission. The device comprises a low-pressure-stage pressurizer and a high-pressure-stage pressurizer; a high-pressure-stage turbine and a low-pressure-stage turbine are mounted on an air exhaust pipeline; a high-pressure-stage air compressor and a low-pressure-stage air compressor are mounted on an air inlet pipeline; and the high-pressure-stage turbine and the high-pressure-stage air compressor can be cut in and cut out through opening and closing of bypass valves as required. The injection pump is further arranged on the air inlet pipeline and is used for producing vacuum in a closed container and pumping water vapor into the air inlet pipeline, and a branch pipeline where the injection pump is located can be cut in and cut out by the aid of a two-position three-way reversing valve as required. With the device, arrangement of an air inlet way nozzle and other related devices can be avoided, relatively small structural alterations are made, and the water addition quantity can be changed flexibly according to the working condition of the diesel engine, so that the combustion temperature of the diesel engine can be reduced, and NOx emission can be reduced.

Description

technical field [0001] The invention relates to a supercharged diesel engine, in particular to a supercharged diesel engine mixed with water and burned. Background technique [0002] With the rapid development of human science and technology, diesel engines have attracted much attention due to their advantages in thermal efficiency, economy, reliability, etc., and have been widely used in automobiles, ships, railways, power generation equipment and other fields. Although the use of diesel engines has greatly promoted the development and progress of society, it will also bring a series of problems such as environmental pollution during use. Among them, NOx is one of the main harmful pollutants, which can cause great harm to the human body. The International Maritime Organization promulgated the Tier III nitrogen oxide emission limit standard in 2008, and it is expected to be implemented in 2016. It requires that the NOx emission of marine diesel engines should be maintained ...

AI Technical Summary

Problems solved by technology

The technology of emulsified oil mixed with water is realized by spraying the emulsified and stable suspension of diesel oil and water into the cylinder through the fuel system. So far, this technology has been mainly divided into two forms: static emulsification and dynamic emulsification. Although the technology of emulsified oil mixed with water can It reduces NOx generation and has little impact on the structure of the diesel engine, but this method requires the configuration of an emulsifier, which is expensive, and the shelf life of the static emulsified oil is short, and long-term storage will cause water and oil stratification

In-cylinder direct water injection technology can flexibly control the water mixing rate, effectively reducing NOx emissions. However, direct in-cylinder water injection requires major structural changes to the diesel engine, and the durability of the nozzle is low, which will affect the performance of in-cylinder direct water injection technology. application

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