Graduation design of Wuhan University of Technology

Design of fuel management system for LNG automobile

College（Major）： International Institute of Education

Professional class： Automobile engineering GJ1304

Student name： Teng Ma

Teacher： Gangfeng Tan

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Abstract

Nowadays, liquefied natural gas (LNG) has been widely used as automobile fuel. In the context of China's new energy policy and vigorously invested, domestic research has gradually deepened, and related industries have gradually produced and begun to take shape. LNG as a vehicle fuel has the advantages of clean, energy density, long mileage, low cost and good safety performance. Therefore, our country has been widely supported and paid attention to the research of LNG automobile fuel system. This paper designed a set of LNG fuel management system, divided into fuel supply system and LNG cold energy recovery system two parts. The first part of the main part is to ensure that the system of normal gas supply, fuel management system to achieve the supply function, the second part of it is designed a set of LNG cold energy recovery system, the recovery of cold energy supply to automotive air conditioning systems and engine cooling system ,to improve energy efficiency, reduce vehicle emissions, the pursuit of higher economic and social benefits.

Key Words：liquefied natural gas；fuel management system；fuel supply；cold energy recovery

Index

chapter1 Introduction 6

1.1 Summary 6

1.2 Technology development status 7

1.2.1 Domestic technology development status 7

1.2.2 Abroad technology development status 7

1.3 LNG fuel supply system 7

1.3.1 Advantages of LNG as automotive fuel 7

1.3.2 Principle of fuel supply system for LNG automobile 8

1.4 LNG cold energy recovery system 8

1.5 Purpose and significance of this paper 8

chapter2 LNG automotive fuel supply system 9

2.1 Overview of LNG automotive fuel supply system 9

2.2 Parameter calculation and model selection of LNG automotive fuel system 9

2.2.1 LNG vehicle cylinders 9

2.2.2 Self pressurization system 10

2.2.3 Selection of control valve 11

2.2.4 Vaporizer design 11

2.3 Summary 12

Chapter3 LNG cold energy recovery system 12

3.1 Cold energy properties of LNG 12

3.2 Overview of LNG cold energy recovery system 13

3.2.1 Composition of LNG cold energy recovery system 13

3.2.2 Principle of LNG cold energy recovery system 13

3.2.3 Working flow of LNG cold energy recovery system 13

3.3 Condensers design 18

3.4 Summary

Reference 20

Thank 21

chapter1 Introduction

1.1 Summary

Natural gas is a promising clean energy with the high calorific value, low pollution and low price, our country the promotion of natural gas has been a new energy policy in our country.LNG (liquefied natural gas) as fuel for vehicles has high economic value and social value of.LNG as fuel not only has the advantages of a conventional fuel unit, high calorific value, low pollution, economic benefits, but also cold energy recovery for air conditioning refrigeration system and cooling system in the process of using ，to achieve maximum utilization of energy and the maximum benefit.

LNG is a kind of liquid which is colorless, tasteless, non-toxic and no corrosion , main component is methane, and may contain a small amount of two alkanes, ethane, isobutane, butane, pentane,nitrogen and other components^[1].LNG is from natural gas at atmospheric pressure, cooled to -162℃ for liquefaction. After dehydration, desulfurization, impurity purification to get. The LNG components are different in different regions, sometimes very different, Table 1.1 is main group of LNG several regions of China a transitivity table parameters, the parameters are the standard condition (0℃, 101.325kpa^[2]).

Table 1.1Main components of LNG in different area

1.2 Technology development status

1.2.1 Domestic technology development status