초록 ▼

A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the r

A boiler is provided with a radiation heat transfer section in its combustion chamber, which has therein, at least one regenerative-heating burner system including a pair of burners each with a regenerative bed. The burners receive combustion air and exhaust combustion gas which passes through the regenerative beds. Combustion is alternately effected in one of the burners and combustion gas is passed into the other burner, and exhausted through the corresponding regenerative bed of this other burner. Surplus thermal energy which is not completely consumed in the radiation heat transfer section is recovered in the regenerative bed. Combustion air than passes through the heated regenerative bed to heat the air. The boiler temperature is kept flat across the boiler. That is, the temperature is kept almost constant across the combustion chamber. This is done by maintaining a high rate of forced supply of more than 60 m/s for the combustion air. Also, the combustion air is heated to above the ignition point of the fuel, that is, about 800.degree. C. These two factors increases thermal efficiency while reducing NO.sub.x emissions.

대표청구항 ▼

[ What is claimed is:] [1.] A method of operating a boiler with increased flame temperature and output, the boiler having a combustion chamber; a radiation heat transfer section in the combustion chamber; and at least one regenerative-heating burner system connected to the combustion chamber, the re

[ What is claimed is:] [1.] A method of operating a boiler with increased flame temperature and output, the boiler having a combustion chamber; a radiation heat transfer section in the combustion chamber; and at least one regenerative-heating burner system connected to the combustion chamber, the regenerative-heating burner system having a pair of regenerative beds and a burner connected to each bed; the method comprising:supplying heat combustion air through each regenerative bed and to each burner at a jet flow rate of at east 60 m/s;supplying the combustion air with fuel to each burner system for forming a flame which produces combustion gas which is exhausted into the combustion chamber and past the radiation heat transfer section, the flame being at a first temperature and the combustion gas being at a second temperature, the combustion air having a temperature preheated to above the ignition temperature of the fuel;causing a flow of said combustion air and flow of said combustion gas to be changed over, relative to each other, for first heating one of the regenerative beds with combustion gas passing therethrough to a temperature above the ignition temperature of the fuel, while combustion air is being supplied through the other one of the regenerative beds for being heated to above the ignition temperature of the fuel before combining with the fuel to form the flame; andheating the combustion air in the regenerative beds to above the ignition temperature of the fuel and substantially to the same temperature as said second temperature of the combustion gas, so that the first temperature of the flame is increased to increase heat transfer to the radiation heat transfer section while creating a substantially flat and high temperature across the combustion chamber.