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Waste gas-fuel reforming and recycling natural gas engine system and control method

An engine system and recirculation technology, which is applied to combustion engines, internal combustion piston engines, charging systems, etc., can solve problems such as increased CO and HC emissions, increased cycle fluctuations, and unstable combustion, to reduce the combustion temperature in the cylinder , reduce volume, widen the effect of lean burn limit

Active Publication Date: 2017-08-18
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, an excessive exhaust gas recirculation rate will lead to unstable combustion, resulting in increased cycle fluctuations, and even misfires, while increasing CO and HC emissions

Method used

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  • Waste gas-fuel reforming and recycling natural gas engine system and control method
  • Waste gas-fuel reforming and recycling natural gas engine system and control method
  • Waste gas-fuel reforming and recycling natural gas engine system and control method

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Such as figure 1 , figure 2 The exhaust gas-fuel reforming recirculation natural gas engine system shown includes an engine 200, a fuel supply device 203 provided in the engine 200 to supply fuel to the engine 200, a gas tank 201 supplied to the fuel supply device 203, a reformer 100 and a central Cooler 206. combine image 3 As shown, the reformer 100 includes a cylindrical reaction shell 101, a hollow front cover 102 fixedly installed on the front end of the cylindrical reaction shell 101 through a front connecting flange 104, and a rear end of the cylindrical reaction shell 101 fixedly installed through a rear connecting flange 105. The hollow rear end cover 103, the intake pipe 106 installed in the air inlet 102a at the central position of the hollow front end cover 102, the waste gas exhaust pipe 107 installed at the a...

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PUM

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Abstract

The invention discloses a waste gas-fuel reforming and recycling natural gas engine system and a control method. The waste gas-fuel reforming and recycling natural gas engine system comprises an engine, a fuel supply device, a gas tank used for supplying to the fuel supply device, a reformer and an intercooler. Engine fuel is directly subjected to a multiple reforming reaction with O2 and water vapor, so that reformed gas which is rich in H2 and CO is generated, and H2 production efficiency is high; online production of hydrogen is achieved, an extra fuel storage device or an extra hydrogen storage tank does not need to be provided, the safety is improved, and the size of the whole system is reduced; two pass tubes are adopted, so that the heat transfer coefficient is increased, and the reforming efficiency is improved accordingly; the reformed gas contains a large quantity of H2, the in-cylinder combustion speed is increased, and the lean burning extreme is widened; the oxygen concentration in a gas inlet pipe can be decreased through circulating waste gas, the specific heat capacity of working media is improved, and the in-cylinder combustion temperature is decreased; and by combining the reformed gas with the circulating waste gas, stable low-temperature lean burning of the natural gas engine can be achieved, and meanwhile, the HC concentration, the CO concentration and the NOx concentration can be decreased.

Description

technical field [0001] The invention belongs to the technical field of LNG engines, and in particular relates to an exhaust gas-fuel reforming recirculation natural gas engine system and a control method. Background technique [0002] Under the dual effects of energy crisis and environmental protection, finding alternative energy sources and reducing pollutant emissions has become a hot topic in the field of internal combustion engine research. As a high-quality alternative fuel for engines, liquefied natural gas (LNG) has the advantages of high energy density, easy transportation, and good combustion effect. When the engine burns natural gas, it has the advantages of low carbon dioxide, sulfide and particulate matter emissions, so it has been vigorously developed. [0003] For natural gas engines, low temperature lean burn technology is often used to suppress knock and nitrogen oxide (NOx) emissions. However, an excessively high air-fuel ratio will lead to engine misfire,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M21/02
CPCF02M21/0215F02M21/0227Y02T10/30Y02T10/12
Inventor 李格升龙焱祥张尊华张宇丰
Owner WUHAN UNIV OF TECH
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