Petroleum residuum burning boiler and combustion method thereof

Abstract

In a petroleum residuum burning boiler including: a high-temperature reduction combustion chamber to which petroleum residuum fuel and primary combustion air are supplied and in which combustion is performed at a temperature of 1,300° C. or more and an air ratio of less than one; and a low-temperature oxidation combustion chamber which is connected to the high-temperature reduction combustion chamber and in which combustion is performed at a temperature of less than 1,300° C. and an air ratio of one or more, an assist gas is supplied to the high-temperature reduction combustion chamber, and unburned carbon of a combustion gas of the petroleum residuum fuel is gasified by a water gas reaction by using steam, generated by combustion of the assist gas, as a gasifying agent.

Description

TECHNICAL FIELD[0001]The present invention relates to a petroleum residuum burning boiler which uses, as fuel, a flame-retardant petroleum residuum, such as asphalt pitch or petroleum coke.BACKGROUND ART[0002]Conventionally known are petroleum residuum burning boilers which use, as fuel, a flame-retardant petroleum residuum, such as asphalt pitch or petroleum coke. PTL 1 discloses this type of boiler.[0003]The boiler described in PTL 1 includes a high-temperature reduction combustion chamber and a low-temperature oxidation combustion chamber located under the high-temperature reduction combustion chamber and connected to the high-temperature reduction combustion chamber through a throat. A primary burner that supplies petroleum residuum fuel and primary combustion air is provided at the high-temperature reduction combustion chamber, and a two-stage combustion air supply nozzle is provided at the low-temperature oxidation combustion chamber. In the high-temperature reduction combusti...

AI Technical Summary

Benefits of technology

The present invention is a petroleum residuum burning boiler and its combustion method that can promote the water gas reaction more effectively and reduce soot combustion. This is achieved by using a gasifying agent called steam, which leads to improved efficiency and lower emissions.

Problems solved by technology

If the combustion ash adheres to a furnace wall or a heat exchanger tube, blocking of heat transfer, blocking of ventilation, and high-temperature corrosion by influence of the high sulfur content may be caused.

Therefore, when using the flame-retardant petroleum residuum as the fuel, reductions in the amount of NOx generated and the amount of soot generated are problems to be solved.

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