Producer gas combustion in the internal combustion engine

Karol Cupiał,Stanisław Szwaja

doi:10.19206/ce-117143

Abstract

The investigation presented in the paper concerns producer gas combustion in both the spark ignited (SI) and the dual-fuel compression ignition (CI) engine with a diesel pilot of 15% with respect to its nominal dose, at compression ratio (CR) of 8, 12 (for the SI engine) and 17 (for the CI engine). The research tasks were mainly focused on combustion instabilities such as engine work cycles unrepeatability and combustion knock onset. The investigation included also combustion of such gases as methane, biogas and hydrogen, which were taken for making comparison between them and the producer gas. The conducted analysis shows that producer gas is resistant to generate knock even if it contains significant hydrogen content of 16%. However, high work cycles unrepeatability is observed when producer gas is combusted in the SI engine. Obtained results led to conclusion that producer gas can be burnt more efficiently in the dual-fuel CI engine than the SI one. Neither misfiring nor knocking have occurred during its combustion in that engine.

Highlights

Investigation conducted in several research centers confirms usefulness of gaseous renewable fuels such as wood gas or digestion gas to feed the internal combustion (IC) reciprocating engine [1, 2]
Significant drop in the area of useful work can be observed with spark timing changing from –35 to –20o crank angle degrees (CA deg)
High work cycles unrepeatability is observed for producer gas combustion in the freely aspirated spark ignited (SI) engine

Summary

Introduction

Investigation conducted in several research centers confirms usefulness of gaseous renewable fuels such as wood gas or digestion gas ( called biogas) to feed the internal combustion (IC) reciprocating engine [1, 2]. The research of the producer gas fueled engine described in this paper was mainly focused on determination of work cycles unrepeatability and knock intensity defined here as maximal amplitude of combustion pressure fluctuations. Gaz generatorowy pozyskiwany w wyniku zgazowania odpadów organicznych także może być wykorzystywany jako paliwo do silnika tłokowego. Spalanie gazu generatorowego w silniku tłokowym z zapłonem iskrowym charakteryzuje się dużą niepowtarzalnością kolejnych cykli pracy silnika co jest spowodowane relatywnie niewielką zawartością składników palnych w tym gazie [3]. Niepowtarzalność kolejnych cykli pracy silnika wyrażano za pomocą współczynnika wariancji średniego ciśnienia indykowanego według wzoru (1). Intensywność tę dla serii pomiarowej złożonej z n cykli spalania obliczano jako wartość średnią IPśr ze zbioru wartości maksymalnej amplitudy pulsacji IPmaks,i występujących w pojedynczych, kolejno po sobie następujących cyklach spalania według zależności (2)

Test bench description

Results

Wyniki badań

Wnioski

Conclusions