Patent ID: 8062029

Claim:
A radiant-heating device for heating an industrial furnace comprising: a) a first burner unit ( 1 ) including: a1) a first burner ( 2 ) that generates a hot exhaust gas by burning a fuel with combustion air, a2) a first air supplier ( 60 ), via which the first burner ( 2 ) is supplied with fresh air, and a3) a first elongated radiant-heating pipe ( 20 ), which includes a rearward end ( 20 a ) connected with the first burner ( 2 ) and a forward end ( 20 b ) spaced from the rearward end ( 20 a ) and in which the hot exhaust gas generated by the first burner ( 2 ) flows from the rearward end ( 20 a ) to the forward end ( 20 b ) of the first radiant-heating pipe ( 20 ) and supplies heat energy along this path to the pipe wall of the first radiant-heating pipe ( 20 ), b) a second burner unit ( 1 ′) including: b1) a second burner ( 2 ′) that generates a hot exhaust gas by burning a fuel with combustion air, b2) a second air supplier ( 60 ′), via which the second burner ( 2 ′) is supplied with fresh air, and b3) a second elongated radiant-heating pipe ( 20 ′), which includes a rearward end ( 20 a ′) connected with the second burner ( 2 ′) and a forward end ( 20 b ′) spaced from the rearward end ( 20 a ′) and in which the hot exhaust gas generated by the second burner ( 2 ′) flows from the rearward end ( 20 a ′) to the forward end ( 20 b ′) of the second radiant-heating pipe ( 20 ′) and supplies heat energy along this path to the pipe wall of the second radiant-heating pipe ( 20 ′), c) a first connection element ( 50 ) that connects the rearward end ( 20 a ) of the first radiant-heating pipe ( 20 ) with the forward end ( 20 b ′) of the second radiant-heating pipe ( 20 ′), so that at least a portion of the exhaust gas generated in the second radiant-heating pipe ( 20 ′) is conducted to the first burner ( 2 ) and is burned again using the first burner ( 2 ), d) a second connection element ( 50 ′) that connects the rearward end ( 20 a ′) of the second radiant-heating pipe ( 20 ′) with the forward end ( 20 b ) of the first radiant-heating pipe ( 20 ), so that at least a portion of the exhaust gas generated in the first radiant-heating pipe ( 20 ) is conducted to the second burner ( 2 ′) and is burned again using the second burner ( 2 ′).