Pulverized coal clean burning boiler with expansion design

Abstract

The invention discloses a pulverized coal clean burning boiler with expansion design. The pulverized coal clean burning boiler comprises a steel frame, a boiler furnace and a burner. The boiler furnace is fixed in the steel frame. A boiler barrel is arranged at the top end of the boiler furnace. The insertion position of the burner is in the lower portion of the boiler furnace. A front membrane wall and a rear membrane wall at the positions, corresponding to the burner, of the boiler furnace expand outwards. According to the pulverized coal clean burning boiler with the expansion design, the center position of flames of the lower portion of the boiler furnace adopts the expansion design, thus, the flames of the boiler furnace can be set more evenly, burning is more stable, meanwhile, the flames can be prevented from burning the walls through the design of increasing the center sectional area of the flames and the boiler furnace depth, and coking of the center area of the flames is avoided; and the area of the membrane walls of the center of the flames is increased, that is, the area of the heating surface of a high temperature zone is increased, and the heating surface utilizationefficiency is improved due to the increase of the area of the heating surface of the high temperature zone.

Description

technical field [0001] The invention relates to the technical field of pulverized coal combustion boilers, in particular to a pulverized coal clean combustion boiler with expansion design. Background technique [0002] In the existing pulverized coal combustion boiler, because the upper and lower cross-sectional areas of the furnace are the same, the shape of the furnace does not adapt well to the flame shape of the pulverized coal combustion, which affects the uniform distribution of the flame, and the existing furnace structure is easy to design the furnace cross-section and the furnace volume In the case of mismatch, when the boiler furnace volume design meets the requirements and the furnace cross-sectional area design is small, the furnace in the center of the flame will be severely coked, and the boiler cannot operate reliably; Coking at the furnace outlet is serious, and the boiler cannot operate reliably; when the design of the cross-sectional area of ​​the boiler fu...

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Problems solved by technology

[0002] In the existing pulverized coal combustion boiler, because the upper and lower cross-sectional areas of the furnace are the same, the shape of the furnace does not adapt well to the flame shape of the pulverized coal combustion, which affects the uniform distribution of the flame, and the existing furnace structure is easy to design the furnace cross-section and the furnace volume In the case of mismatch, when the boiler furnace volume design meets the requirements and the furnace cross-sectional area design is small, the furnace in the center of the flame will be severely coked, and the boiler cannot operate reliably; Coking at the furnace outlet is serious, and the boiler cannot operate reliably; when the design of the cross-sectional area of ​​the boiler furnace meets the requirements, and the design of the furnace volume also meets the requirements, due to the low utilization rate of the heating surface of the furnace outside the flame center, it is easy to cause a large increase in the layout of the heating surface of the boiler, increasing the boiler manufacturing cost

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