Supercritical CO2 circular and elliptical tangential boiler furnace body with uniform thermal loads

Abstract

The invention relates to a supercritical CO2 circular and elliptical tangential boiler furnace body with uniform thermal loads. A furnace hearth comprises a burner cavity. The cross section of an inner cavity of the burner cavity is circular or elliptical. At least one burner assembly is axially arranged in the burner cavity, and the burner assembly comprises a first deflection secondary air nozzle, a primary air nozzle, a second deflection secondary air nozzle and a direct current secondary air nozzle which are arranged in a spaced manner from bottom to top successively. A SOFA air nozzle isarranged on a cavity wall of the burner cavity. An air path system comprises a primary air fan, a secondary air fan, a coal mill and a secondary air distributor. An outlet of the primary air fan and apulverized coal outlet of the coal mill are connected to the primary air nozzle through a primary air pipe. An air outlet of the secondary air fan is connected to the first deflection secondary air nozzle, the second deflection secondary air nozzle, the direct current secondary air nozzle and the SOFA air nozzle separately. The supercritical CO2 circular and elliptical tangential boiler furnace body has the advantages that the thermal loads in the furnace hearth are uniformly distributed axially and radially, so that overtemperature of a heated surface of the boiler furnace is avoided.

Description

technical field [0001] The invention relates to the technical field of coal-fired boiler operation, in particular to a supercritical CO 2 Circular and elliptical cut-round boiler furnace body. Background technique [0002] Supercritical CO 2 Coal-fired power generation system has attracted extensive attention at home and abroad due to its advantages such as high power generation efficiency, compact system structure, and small turbine size. However, due to the supercritical CO 2 The physical and chemical properties of the working fluid in the boiler have changed, the heat transfer performance is lower than that of conventional steam boilers, and the average heat absorption temperature is higher than that of conventional steam boilers. Therefore, the traditional boiler structure is not fully suitable for supercritical CO 2 boiler. Conventional coal-fired tangential boilers have a single furnace tangential structure, double furnaces and double tangential circle structures, ...

AI Technical Summary

Problems solved by technology

However, due to the supercritical CO 2 The physical and chemical properties of the working fluid in the boiler have changed, the heat transfer performance is lower than that of conventional steam boilers, and the average heat absorption temperature is higher than that of conventional steam boilers. Therefore, the traditional boiler structure is not fully suitable for supercritical CO 2 boiler

Conventional coal-fired tangential boilers have a single furnace tangential structure, double furnaces and double tangential circle structures, and the boiler burner area has a square or rectangular structure. This structure leads to a large heat flux density in the area near the flame in the center of the outer wall and high temperature on the radiation heating surface. Severe corrosion, coking and slagging

Solve the uneven distribution of thermal load along the axial and longitudinal directions of the conventional furnace, which can effectively solve the problem of supercritical CO 2 The problem of overheating of boiler heating surface

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