Supercritical CO2 boiler capable of realizing uniform combustion, corrosion resistance and coking resistance and boiler system

Abstract

The invention discloses a supercritical CO2 boiler capable of realizing uniform combustion, corrosion resistance and coking resistance and a boiler system. The supercritical CO2 boiler comprises a main combustion chamber, an upper hearth, a furnace arch and a flue; the cross section of the main combustion chamber is round, oval or N-sided, N is larger than 4, and at least four combustor groups arearranged on the main combustion chamber; each group of combustor nozzles corresponding to each combustor group include a recirculating air nozzle, a primary air nozzle and a secondary air nozzle, andside recirculating air nozzles which are symmetrically distributed are arranged on the two sides of the primary air nozzle; the recirculating air nozzles and the side recirculating air nozzles are used for feeding recirculating flue gas or mixed gas of the recirculating flue gas and secondary air into the main combustion chamber; the primary air nozzles are used for feeding primary air or mixed gas of the primary air and the recirculating flue gas into the main combustion chamber; and the secondary air nozzles are used for feeding secondary air or mixed gas of the secondary air and the recirculating flue gas into the main combustion chamber; the load of the supercritical CO2 boiler and the load of the boiler system are uniform, and high-temperature corrosion, coking and slagging on the wall surface of the boiler are avoided.

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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