Supercritical CO with uniform combustion and anti-corrosion and anti-coking 2 Boilers and Boiler Systems

Abstract

The supercritical CO with uniform combustion and anti-corrosion and anti-coking disclosed in the present invention 2 The boiler and boiler system include the main combustion chamber, the upper furnace, the folding flame angle and the flue. The cross-section of the main combustion chamber is circular, oval or N-shaped, and N>4, and there are at least four Burner group, each group of burner nozzles corresponding to each burner group includes recirculation air nozzles, primary air nozzles and secondary air nozzles, and there are symmetrically distributed side recirculation air nozzles on both sides of the primary air nozzles. The nozzles and side recirculation air nozzles are used to feed recirculated flue gas or a mixture of recirculated flue gas and secondary air into the main combustion chamber, and the primary air nozzles are used to feed primary air or primary air and secondary air into the main combustion chamber. The mixed gas of the circulating flue gas, the secondary air nozzle is used to send the secondary air or the mixed gas of the secondary air and the recirculating flue gas into the main combustion chamber, so that the supercritical carbon dioxide boiler and the boiler system are loaded evenly, and avoid the boiler wall High temperature corrosion and coking and slagging occur.

Description

technical field [0001] The invention relates to the technical field of supercritical carbon dioxide boilers, in particular to an anti-corrosion and anti-coking supercritical carbon dioxide boiler and a boiler system. Background technique [0002] Supercritical carbon dioxide coal-fired power generation technology is currently a research hotspot in the world. This technology has the advantages of high efficiency, low cost and environmental protection. However, because the supercritical carbon dioxide boiler replaces the hydraulic medium in the traditional boiler with carbon dioxide, the traditional boiler structure cannot be fully applied to the supercritical carbon dioxide boiler. At present, the traditional large-scale coal-fired boilers are all rectangular structures, and then form four-corner tangential combustion, double tangential combustion or hedging combustion, but this method will inevitably lead to uneven distribution of combustion in the entire combustion chamber,...

AI Technical Summary

Problems solved by technology

However, because the supercritical carbon dioxide boiler replaces the water working medium in the traditional boiler with carbon dioxide, the traditional boiler structure cannot be fully applied to the supercritical carbon dioxide boiler.

At present, the traditional large-scale coal-fired boilers are all rectangular structures, and then form four-corner tangential combustion, double tangential combustion or hedging combustion, but this method will inevitably lead to uneven distribution of combustion in the entire combustion chamber, and the heat flux density of some furnace walls High and low oxygen concentration near the wall

This is not allowed in supercritical carbon dioxide boilers, because the wall temperature of supercritical carbon dioxide boilers will increase by about 200°C compared with traditional boilers. Problems such as temperature burst tubes, high temperature corrosion, coking and slagging, etc., threaten the safety of boilers

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