| 摘要 |
<p>The invention concerns a heater, comprising a combustion chamber in which a burner (7) and a heat exchanger (11) for fluid to be heated are arranged. The burner (7) is oblong and has a mixing chamber (8) with a venturi-shaped cross section; the converging inlet part (15) of said mixing chamber is connected to a feeding device (9) for supplying air and fuel. The air and fuel are each supplied through a restriction plate (24) of the feeding device, said plate comprising two rows of calibrated openings (25, 26), so that a row of incoming air jets and a row of incoming fuel jets are obtained. The row of air jets is directed against deflecting means (30), which are incorporated in the upper wall of the inlet part (15) in order to obtain an appropriate mixing. The diverging outlet part (17) of the mixing chamber (8) is closed by a burner plate (10) with evenly divided parts.
<??>It has been found that the temperature of the burner plate depends upon the CO2 percentage in the flue gases.
<??>The invention also concerns a method of controlling the combustion in the heater, whereby the temperature of the burner plate is measured and the air-fuel ratio is controlled dependent upon the measured temperature. </p> |
