Water circulation structure of fuel gas corner tube hot-water boiler

Abstract

The invention provides a water circulation structure of a fuel gas corner tube hot-water boiler. Rising flow is completely forced by a heat-absorbing face and possible tube burst accidents caused by hydraulic working condition deterioration such as subcooled boiling, stagnating and backflow are avoided. A boiler body is of a frame-type self-supporting structure composed of large-diameter steel tubes arranged on the four corners, an upper collecting box, a lower collecting box, a longitudinal collecting box and a transverse collecting box; the water circulation structure is composed of a water cooling wall of a front wall of a furnace hearth, a water cooling wall of a rear wall of the furnace hearth, a membrane-type water cooling wall heat-absorbing face of a side wall I, a membrane-type water cooling wall heat-absorbing face of a side wall II, a membrane-type water cooling wall heat-absorbing face of a side wall III, a conversion shaft membrane-type water cooling wall heat-absorbing face, a flag-type heat-absorbing face, a collection box and connection pipes between the water cooling wall of the front wall of the furnace hearth, the water cooling wall of the rear wall of the furnace hearth, the membrane-type water cooling wall heat-absorbing face of the side wall I, the membrane-type water cooling wall heat-absorbing face of the side wall II, the membrane-type water cooling wall heat-absorbing face of the side wall III, the conversion shaft membrane-type water cooling wall heat-absorbing face, the flag-type heat-absorbing face and the collection box. The flag-type heat-absorbing face which does not penetrate through the walls is directly welded to the densely-arranged membrane-type water cooling wall of the rear wall, so that the transverse pitches of tube bundles are reduced and reasonable smoke flow speed is guaranteed; two side walls are divided into three levels of heat-absorbing faces according to different heat loads, so that heat deviation and flow deviation in the water tubes are greatly reduced. The boiler body is composed of the full-membrane-type water cooling walls, the conversion tube bundles do not penetrate through the walls, the air-tightness is good, the air leakage amount is small, the burning efficiency is high, and the water circulation structure can safely and efficiently operate for a long time under various loads.

Description

technical field

[0001] The invention relates to the technical field of boiler equipment, in particular to a water circulation structure of a gas corner tube hot water boiler. Background technique

[0002] In recent years, with the discovery of several new large natural gas fields in China, such as Longgang, Dabei, and Keshen, more and more small coal-fired hot water boilers have been replaced by gas-fired boilers. Compared with coal-fired boilers, gas-fired boilers can fundamentally solve many environmental problems such as dust, waste water, waste residue, and harmful gas emissions. Among them, the corner-tube gas-fired hot water boiler has the advantages of reasonable structure, less raw material consumption, safe and reliable long-term operation, high efficiency, energy saving, emission reduction and environmental protection, and will definitely become the first choice of gas-fired hot water boiler in my country.

[0003] However, the existing angle tube technology has t...

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