A boiler full oxygen combustion process

Abstract

The invention discloses an oxy-fuel combustion process of a boiler. The oxy-fuel combustion process of the boiler is characterized in that oxygen serves as primary air to be fed into the boiler, oxygen and carbon dioxide serve as secondary air to be fed into the boiler, and flue gas generated after combustion of the boiler is purified by a desulfurizer, wherein the volume ratio of the oxygen to carbon dioxide in the secondary air is (21-23):(77-79). By means of the oxy-fuel combustion process of the boiler, the oxy-fuel combustion of the boiler is achieved, the situation that flue gas containing nitric oxide is generated when air is used for combustion of the boiler is avoided, and the purpose of denitration in the burning process of the boiler is achieved; the flue gas purification can be completed in combination with the desulfurizer; and the oxy-fuel combustion process of the boiler is suitable for the fields of coal-fired flue gas, furnace flue gas and the like.

Description

Technical field

[0001] The invention is a boiler all-oxygen combustion process, in particular to a flue gas purification process capable of achieving low nitrogen emission from boiler combustion, and belongs to the field of coal-fired flue gas and industrial furnace flue gas purification treatment. Background technique

[0002] my country's energy resource endowment determines my country's coal-based energy supply and consumption pattern. Coal-fired flue gas constitutes the most important source of air pollution in my country. Purification and treatment of industrial and domestic coal-fired flue gas is a key link in my country's air pollution control and improvement of atmospheric environmental quality.

[0003] With the continuous improvement of the requirements for flue gas treatment, the shortcomings of the existing flue gas denitration technology are gradually emerging:

[0004] 1) The denitration process relies on catalysts, reducing agents or oxidizers, which has high operati...

Examples

Embodiment 1

[0028] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 21:79.

Embodiment 2

[0030] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 23:77.

[0031] In this embodiment, the oxygen used in the primary air and the oxygen used in the secondary air are both produced by the PSA oxygen production device, and the exhaust air of the PSA oxygen production device and the excess carbon dioxide generated by the combustion of the boiler are vented through the chimney.

Embodiment 3

[0033] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 21:77.

[0034] In this embodiment, the carbon dioxide used in the secondary air is produced from the purified flue gas through the VSPA device, and the excess carbon dioxide produced by the VSPA device and the excess carbon dioxide generated by the combustion of the boiler are vented through the chimney.

Technical field

[0001] The invention is a boiler all-oxygen combustion process, in particular to a flue gas purification process capable of achieving low nitrogen emission from boiler combustion, and belongs to the field of coal-fired flue gas and industrial furnace flue gas purification treatment. Background technique

[0002] my country's energy resource endowment determines my country's coal-based energy supply and consumption pattern. Coal-fired flue gas constitutes the most important source of air pollution in my country. Purification and treatment of industrial and domestic coal-fired flue gas is a key link in my country's air pollution control and improvement of atmospheric environmental quality.

[0003] With the continuous improvement of the requirements for flue gas treatment, the shortcomings of the existing flue gas denitration technology are gradually emerging:

[0004] 1) The denitration process relies on catalysts, reducing agents or oxidizers, which has high operati...

Examples

Embodiment 1

[0028] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 21:79.

Embodiment 2

[0030] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 23:77.

[0031] In this embodiment, the oxygen used in the primary air and the oxygen used in the secondary air are both produced by the PSA oxygen production device, and the exhaust air of the PSA oxygen production device and the excess carbon dioxide generated by the combustion of the boiler are vented through the chimney.

Embodiment 3

[0033] This embodiment relates to a boiler all-oxygen combustion process. Oxygen is fed into the boiler as primary air, and oxygen and carbon dioxide are fed into the boiler as secondary air. The flue gas after boiler combustion is passed through the desulfurization device to obtain purified flue gas. In the wind, the volume ratio of oxygen to carbon dioxide is controlled at 21:77.

[0034] In this embodiment, the carbon dioxide used in the secondary air is produced from the purified flue gas through the VSPA device, and the excess carbon dioxide produced by the VSPA device and the excess carbon dioxide generated by the combustion of the boiler are vented through the chimney.

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