Combustion performance of domestic gas cookers with swirling strip-port and normal round-port on various natural gas compositions

Abstract

This document aims to assess the different performance of swirling strip-port and normal round-port domestic gas cookers with gas property fluctuation and propose suitable structure design parameter for both port types. Comparing with normal round-port gas cookers, swirling strip-port samples are not advantage on aspects of thermal efficiency and CO emission, but in term of NOx emission it performs very well which can effectively control NOx emission in a suitable range and improve gas cooker′s adaptive capacity, when natural gas is interchanged. It is easier to qualify CO emission with low NOx emission for swirling strip-port gas cookers, though it will sacrifice a part of thermal efficiency, while normal round-port gas cookers are easier to qualify CO emission with high thermal efficiency. The burner head design structure parameters of normal round-port gas cookers which can well adapt natural gas interchange are port thermal intensity in 7.2–8.4 W/mm2 and structure factor ε in 30–40, as well as swirling strip-port gas cookers are port thermal intensity in 8.0–11.5 W/mm2 with structure factor ε in 35–45. Keywords: Domestic gas cooker, Swirling strip-port, Normal round-port, Thermal efficiency, Emission, Natural gas interchange