LNG–Air Mixture as a Supplementary Energy Injection into a Biogas Distribution Network

Yang Zhou,Jing Zhang,Chang Wu,Xiaomei Huang,Shini Peng

doi:10.3390/en10111902

Abstract

Biogas production efficiency fluctuates with climate variations and agricultural arrangements, which pose a limiting factor upon its single supply to end users via a regional exclusive network, especially in peak demand. In this paper, an appropriate methodology to address the contradiction between biogas supply and demand is proposed. Methane conditioned by the addition of air is described, and can be a supplementary energy injected into a biogas distribution network. To accomplish the mixing process and also inject the exhaust mixture into the distribution system, a mixer–ejector was introduced and integrated into the biogas grid. Finally, the fundamental combustion behaviors of mixed gases were estimated through the analysis of flame appearance, contamination emissions, and the flame stability region. The results showed that the methane/air mixture with a mixing ratio ranging from 49/51 to 53/47 could interchange biogas commendably, and good combustion behavior was obtained on a typical biogas-burning appliance.

Highlights

IntroductionCompared to small-scale household digesters [4,5,6], centralized biogas plants (CBPs) [7] based on breeding farms have been the subject of increasing attention in rural areas for their broader uses
Biogas from the anaerobic digestion of organic sources is deemed as an environmentally-sustainable energy that may contribute to alleviating energy crises, and reducing carbon dioxide (CO2 ) emissions [1,2].In the past few decades, China’s biogas digester projects have experienced a rapid construction process, which has improved the family energy consumption structure and promoted the development of livestock breeding and farm production in rural China [3].Compared to small-scale household digesters [4,5,6], centralized biogas plants (CBPs) [7] based on breeding farms have been the subject of increasing attention in rural areas for their broader uses
Blending experiments were conducted at a wide range of inlet pressures were conducted a wide range inlet 7, pressures and outlet Blending pressuresexperiments

Summary

Introduction

Compared to small-scale household digesters [4,5,6], centralized biogas plants (CBPs) [7] based on breeding farms have been the subject of increasing attention in rural areas for their broader uses. Numerous researchers and organizations [8,9,10,11,12,13] have performed considerable investigations into the applications of CBP biogas energy in upgraded or raw forms. Upgraded biogas can be converted into electricity using a fuel cell or injected into an NG network, the high-cost of the purification process makes it unaffordable for rural households in undeveloped countries [14]

Objectives

Methods

Results

Conclusion