Asymmetric furnace arch structure capable of reducing boiler flue gas temperature difference

Abstract

The invention discloses an asymmetric furnace arch structure capable of reducing boiler flue gas temperature difference, and relates to a structure of tangent arrangement of a combustor hearth, in particular to the asymmetric furnace arch structure capable of reducing the boiler flue gas temperature difference. The structure comprises two furnace arches which are arranged at the connecting position of a horizontal flue and a hearth main combustion area, and the two furnace arches are arranged on a hearth front wall and a hearth rear wall, and the two furnace arches are arranged on the hearth front wall and the hearth rear wall in an asymmetric manner. The structure is simple, when the main combustion area airflow rotates anticlockwises, the furnace arch, close to the left side, of the hearth front wall can guide the flow direction of the flue gas on the left side to the horizontal flue as far as possible, the deviation degree of the flue gas to the hearth front wall is greatly weakened, the guide effect on the flue gas on the right side is not changed, flue gas flow rates of the left side and the right side of a hearth outlet are finally consistent, and are consistent with the heatexchange amount of the heating face, and the flue gas temperature difference is greatly reduced.

Description

technical field [0001] The invention relates to a structure for tangentially arranging a burner furnace, in particular to an asymmetrical folded flame angle structure for reducing boiler smoke temperature deviation. Background technique [0002] Common types of boilers in coal-fired units in my country include four-corner tangential boilers, W flame boilers, and front and rear wall confrontation boilers. Among them, four-corner tangential boilers are the most widely used because of their advantages such as high flame fullness, sufficient combustion, and low pollutant emissions. . my country's four-corner tangential boilers mostly adopt a Π-type layout, that is, a panel superheater is arranged above the main combustion zone, a convection superheater and a reheater are arranged in a horizontal flue, and an economizer and a low-temperature superheater are arranged in a shaft flue. A refraction corner is arranged at the connection between the rear wall of the furnace wall and th...

AI Technical Summary

Problems solved by technology

[0003] However, the flue gas at the furnace outlet of the four-corner tangential circle boiler still has a strong residual rotation, and the guiding effect of the flame angle on the flue gas leads to the difference in the flue gas flow field and temperature distribution on the left and right sides of the flue. Average, there is a deviation in smoke temperature, and the degree of deviation will increase with the increase of unit capacity

The deviation of the flue gas temperature will lead to the deviation of the steam temperature on the left and right sides of the heating surface. In severe cases, it will cause the overheating of the tube wall of the superheater and reheater. Long-term operation will also lead to pipe bursts and other phenomena that seriously endanger the safe operation of the boiler.

Images