Smoke-exhausting denitrifying and silencing system of gas internal-combustion engine

Abstract

The invention discloses a smoke-exhausting denitrifying and silencing system of a gas internal-combustion engine. The smoke-exhausting denitrifying and silencing system comprises a high-temperature smoke-exhausting pipe, wherein the exhausting end of the high-temperature smoke-exhausting pipe is respectively connected with a waste-heat recovery device and a high-temperature smoke bypass pipe; theother end of the waste-heat recovery device is connected with a smoke mixer; the high-temperature smoke bypass pipe is connected with a high-temperature smoke bypass adjusting valve; the other end ofthe high-temperature smoke bypass adjusting valve is connected to the smoke mixer; the smoke-exhausting end of the smoke mixer is connected with a denitrifying and silencing combined device. The smoke-exhausting denitrifying and silencing system disclosed by the invention is simple in structure, high in heat recovery rate, thorough in denitrification and good in silencing effect, and is economicaland environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of ultra-low emission of a prime mover of a gas distributed energy system, and in particular relates to a gas internal combustion engine exhaust gas denitrification and noise reduction system applied to a gas distributed energy system prime mover with ultra-low emission. Background technique [0002] Gas distributed energy stations are all installed near users (usually hospitals, commercial centers, data centers, large regional office buildings and residential areas, etc.), and the use of gas distributed energy stations will emit a large amount of NO X Gas, which will enhance and promote the haze of the atmospheric environment around the user, and cannot meet the user's increasingly high requirements for the air quality of the environment. [0003] And with the improvement of national energy conservation and environmental protection requirements, the emissions of gas internal combustion units need to meet ul...

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Problems solved by technology

[0004] In the prior art, NO in flue gas X The deNOx device is often installed in the high temperature section of the flue gas, and the exhaust gas temperature of the gas internal combustion engine can usually reach 480-550°C, which is higher than that of the existing NOx removal X The applicable temperature of the catalyst is 350-400°C, so in order to remove NO X It is necessary to reduce the temperature of the flue gas to the applicable temperature range of the catalyst, and a cooler is required, but this will cause the heat loss of the flue gas, and the heat recovery amount of the waste heat recovery device will be reduced

[0005] At the same time, because the working principle of the gas internal combustion engine is piston movement, that is, the gas is mixed with air and burned in its cylinder to generate high-temperature flue gas that expands to drive the piston to do work, and then converts it into mechanical work to drive the generator to generate electricity through the connecting rod mechanism, so the high-temperature flue gas The alternating expansion of gas makes the noise of the internal combustion engine greater than 110-120dB(A)

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