Design and experimental investigation of a top-fed pellet burner

Abstract

The primary goal was to design as economic as possible pellet stove with the efficiency larger than 92% and steady combustion with the carbon monoxide emissions less than 100 mg/m3N at13 vol% of O2 in the dry flue gas. Based on the testing of the developed stove, operational problems of pellet stoves the aim of this paper is to present: 1. the developed burner cup and pollutant emissions from the stove. In addition, to address operational, construction and and fuel-relating problems. 2. solution for glass cleaning, and 3. a simple constructional modification of the burner cup that could enable easier automatic control of the burning process. Using air openings at the top of the front door of a stove and directing it to flow along the glass surface by Coanda effect can reliably be used to clean the glass in steady operating conditions,i.e. when steady negative static pressure is maintained in the combustion chamber. To keep competitiveness at the market of pellets stoves, the automatic control system should consists of a fan, a screw conveyer, a lambda probe, and a damper. For the examined stove and suggested system, the movement of the damper should be expected in the range from 0 to 30°