Fuel oil and fuel gas angle pipe boiler structure for strengthening convection pipe screen through needle fins

Abstract

The invention discloses a fuel oil and fuel gas angle pipe boiler structure for strengthening a convection pipe screen through needle fins. A steam boiler is composed of a boiler cylinder, a hearth and a convection heating surface. The hearth is composed of a front wall, a rear wall, a left side wall membrane water wall and a right side wall membrane water wall. The convection heating surface is composed of a side-by-side convection pipe screen, a convection vertical shaft front wall, a convection vertical shaft rear wall, two side walls and other additional heating surfaces, wherein the side-by-side convection pipe screen is formed by connecting 1 to n sets of needle-shaped evaporation pipe bundles, 1 to m sets of economizer pipe bundles and a collection box. A water boiler is free of boiler cylinders. A hearth of the water boiler is composed of a front wall, a rear wall, a left side wall I membrane water wall and a right side wall II membrane water wall. A convection heating surface is composed of a side-by-side convection pipe screen, a convection vertical shaft front wall, a convection vertical shaft rear wall, two side walls and other additional heating surfaces, wherein the side-by-side convection pipe screen is formed by connecting 1 to n sets of needle-shaped pipe bundles and a collection box. The convection pipe bundles are strengthened through the needle fins in a segmented mode, the length of the needle fins gradually increases according to the temperature decrease of smoke, the average heat transfer coefficient is increased, and the heat exchange area is enlarged; the boiler is compact in structure, high in air tightness, less in air leakage and high in combustion efficiency and has an ultra-strong power outage protection function.

Description

technical field [0001] The invention relates to the technical field of boiler equipment, in particular to a fuel gas corner tube boiler structure with needle-fin reinforced convection tube panels, including two different structures including a steam boiler and a hot water boiler. Background technique [0002] In recent years, with the discovery of several new large-scale natural gas fields such as Longgang, Dabei, and Keshen in China, and oil fields such as Changqing Jiyuan and Zhangwu Shuangmiao of CNPC, more and more small coal-fired boilers have been replaced by oil-fired gas. Boiler replaced. Compared with coal-fired boilers, fuel-fired 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 oil-fired gas boiler has the advantages of reasonable structure, low raw material consumption, safe and reliable long-term operation, high efficiency, energy saving, emissi...

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Problems solved by technology

[0004] 1) In the traditional corner-tube hot water boiler, the heating surface at the tail of the flue mostly adopts the flag-type heating surface with the flue gas scouring horizontally and is only arranged by serpentine light pipes. On the one hand, the steel consumption and volume of the boiler are increased , the many elbows of the serpentine tube greatly increase the flow resistance of the working medium. On the other hand, when the flue gas flows through the heating surface at the tail of the flue, the heat exchange between the flue gas and the heating surface is not good due to the small heat transfer area. good

[0005] 2) The traditional corner-tube steam boiler only uses the water-cooled walls of the front and rear walls of the furnace and the water-cooled walls of the side walls as the evaporation heating surface, while in the convection shaft where the flue gas temperature is still high, the heating surface is only used as the heating surface of the economizer. Failure to make full use of the heat of this part of the high-temperature flue gas greatly reduces the efficiency of the boiler

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