Device and method for boiler superheat temperature control

Abstract

A boiler designed or retrofitted to produce less greenhouse gasses by using a substantially pure oxygen atmosphere in which to burn fuel. The boiler having a primary burner and water tubes is provided. The boiler further comprises at least one secondary burner located as needed in a zone above the primary burner area and below the boiler steam outlet. The secondary burner providing heat or energy to increase the temperature and quality of the steam. The secondary burner providing the heat or energy lost through the diminished flow rate of exhaust gases through the boiler as a result of the use of oxygen rather than pressurized air.

Description

FIELD OF THE INVENTION [0001] The present invention concerns steam boilers designed or modified to operate with oxygen and fuel with the absence of normal combustion air and requires a superheated and or reheated steam temperature control employing an advanced method of controlling the superheat and or reheat temperature of steam in the boiler above the conventional combustion region. More particularly the present invention concerns a boiler having at least one additional burner using oxygen and fuel with the absence of normal combustion air in the convection area in order to boost heat and energy at the superheat and or the reheated areas and convection regions as may be required to maintain proper steam temperatures at the outlet of the steam boiler. BACKGROUND OF THE INVENTION [0002] Power plants and or steam plants used by utility companies, industries and municipalities for, among other applications, the production of steam and electricity, typically comprise small to giant boi...

AI Technical Summary

Benefits of technology

"The present invention provides a boiler system that uses oxygen and a primary burner to heat water in a boiler, with a secondary burner placed above the primary burner to provide additional heat and energy to produce desirable quantities and quality of steam. The secondary burner can be fed with pure oxygen or with recycled flue gas to control the superheat temperature of the steam. The use of recycled flue gas can also help to reduce greenhouse gases. The system can also include a superheater and reheat device to optimize the heating of the steam. Overall, the invention provides a more efficient and effective boiler system for generating energy."

Problems solved by technology

However, along with this benefit, it has been found that the burning of fuel in the presence of nitrogen rich air causes the production of nitrogen oxide (NOx), a deleterious greenhouse gas.

In prior art boilers, the burning of air in the boilers, and the necessary increased flow of air into the boiler, in order to provide a stoichiometric proportion of oxygen to complete combustion, concomitantly, causing a great amount of flow and produces great quantities of NOx.

However, because use of pure oxygen at an un-pressurized flow rate creates the stoichiometric proportion needed to consume fuel, without the need for the rapid / forced flow used with air, heat and energy are concomitantly not forced (by the pressure otherwise used to pump air into the boiler) up to the heights of the boiler.

This results in the failure of such boilers to provide an effective alternative to the prior art greenhouse gas producing furnaces.

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