Combined screwed pipe water-fire tube boiler

Abstract

The invention provides a combined screwed pipe water-fire tube boiler and relates to an industrial boiler taking screwed pipes as main heat convection heating surface. The combined screwed pipe water-fire tube boiler comprises a body, a steel frame backplate, a oven wall liner heat preservation, a chain grate stoker, an air collector, a backwater allocating header and a boiler exhaust gas outlet. The body comprises a drum, a left and right side water wall tube assembly, a front arch tube assembly, a back arch tube assembly and a combined screwed pipe assembly. After the backwater allocating header is communicated with the body via a pipe, an total water return pipe of the boiler is conveyed into the boiler via the backwater allocating header and the combined screwed pipe assembly, the boiler allocates a side water wall tube circulating loop comprising left and right side water wall tube assemblies, a front arc-shaped tube circulating loop comprising front arc-shaped tube assemblies and back arc-shaped tube circulating loop comprising back arc-shaped tube assemblies to circulate back to the boiler, the air collector extracts out and pipelines are utilized to transport to users. The combined screwed pipe assemblies composed by high efficient heat exchanger element screwed pipes to an upright arrangement is adopted in convection heat exchanging area on the tail portion of the boiler, material consumption is reduced, module production is adopted in plants, production quality is easy to control, the weight of single assembly unit is light, field mounting is convenient and project duration is short.

Description

technical field [0001] The invention relates to an industrial boiler structure with a threaded tube as the main convective heat exchange heating surface, belonging to the application field of industrial boilers, in particular to a combined threaded tube water-fire tube boiler. Background technique [0002] Existing water-fire tube boilers using threaded tubes increase the size of the boiler shell and tube plate with the increase of boiler capacity, such as: a 100t (70MW) boiler consists of three diameters of Composed of pot shells, a single pot shell including threaded pipes weighs about 40 tons. The top-heavy pot shell arranged on the upper part also affects the overall stability of the boiler and has poor shock resistance. Due to the large diameter of the boiler shell and the large wall thickness of the boiler shell, the development of boilers above 100t (70MW) is subject to certain restrictions. On the other hand, the water quality of hot water boilers does not meet the...

AI Technical Summary

Problems solved by technology

[0002] Existing water-fire tube boilers using threaded tubes increase the size of the boiler shell and tube plate with the increase of boiler capacity, such as: a 100t (70MW) boiler consists of three diameters of Composed of pot shells, a single pot shell contains threaded pipes and weighs about 40 tons. The pot shell arranged on the upper part has a top-heavy feeling, and also affects the overall stability of the boiler, and its shock resistance is poor.

Due to the large diameter of the boiler shell and the large wall thickness of the boiler shell, the development of boilers above 100t (70MW) is subject to certain restrictions

On the other hand, the water quality of hot water boilers does not meet the national standard requirements, especially in some areas in northern my country. In addition, the circulating water speed of the existing threaded tube water and fire tube boilers is low, and the water wall scaling and bursting of the front tube often occur. Faults such as plate cracks and bulging at the bottom of the boiler drum make the boiler unable to operate stably

At present, the existing boiler threaded tubes are arranged horizontally, and the number of internal threaded tubes in a single boiler drum is arranged in a large number and density, making maintenance difficult

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