Low discharge high energy efficiency vertical shell type water-fire tube boiler

Abstract

A vertically-arranged spiral-cased water-gas-tube boiler which is low discharge and high energy efficiency relates to the thirties big boilers series, namely that large-size and middle-sized water-gas-tube grate firing boilers of loose coal, molded coal and biological energy, or gas and fuel oil of boilers in household, and comprises a hot-water boiler, a vapor boiler, a phase-change heat transfer hot-water boiler and a distributed thermo-electricity cogeneration boiler. The invention comprises a longitudinally-arranged barrel, a crossbar collection chamber, a wall-cooling pipe, a vertically-arranged spiral casing, and a thread flue tube and the like. The invention changes the flue way of a current water-gas-tube boiler from a longitudinal flue way which horizontally returns front and rear to a transverse flue way which vertically returns up and down. Smoke is naturally realized two large flashes before entering the flue tube. The vertically-arranged spiral casing is totally exposed and heated in the tail flue way of the boiler. With the same volume of the boiler and steel consumption, the invention significantly enlarges the capacities of a hearth and the flue way and radiating convection heating area. Only one baffle is arranged in five returns of a coal-fired hot water total forced-circulation waterway, and three returns of a gas-fired total forced-circulation waterway is not provided with a baffle, which not only completely eliminates tube explosion, tube plate crack and fuel tube abrasion, but also a smoke sedimentation chamber is arranged on the front bottom portion of a smoke-discharge mouth, which largely reduces the initial discharge concentration of smoke.

Description

technical field [0001] The present invention relates to twenty boiler series, that is, large and medium-sized vertical shell-type water-fire tube layer-fired raw coal, briquette, biomass and chamber-fired gas, fuel oil: hot water, steam, phase change and distributed heat and power cogeneration boilers. Background technique [0002] After decades of development, the vertical shell type water-fire tube boiler used to have the highest rate of tube plate cracks and tube burst accidents, but it is also the furnace type with the highest output in the industry, because the structure of this type of furnace is simple and compact, and it is easy to manufacture and install. Short cycle, small footprint, high heat transfer coefficient and no air leakage, etc., so that the furnace can continue to develop, especially in the past ten years, large-capacity water-fire tube hot water boilers have developed rapidly, tube plate cracks and tube bursts Defects have been fundamentally improved, mak...

AI Technical Summary

Problems solved by technology

The development potential is to solve the six outstanding shortcomings that still exist in this type of furnace. One is the large smoke resistance and the high power consumption of the induced draft fan, which obviously affects the overall energy efficiency; The gap between advanced countries is large; the third is that dust is easy to accumulate in the flue and the flue pipe, and it is troublesome to remove the ash; the fourth is that the flue pipe is easy to wear and affect the service life; Sixth, the vertical suspension of the pot shell is relatively high, and the seismic performance is poor

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