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

Abstract

A water-fire tube boiler of a low discharging high-performance vertically-arranged boiler casing type relates to eight boiler series, namely a large or middle water-fire tube grate firing, a chamber combustion, hot-water, steam, and phase-change and distributed type cogeneration boiler. The invention comprises a longitudinal barrel, a crossbar collecting box, a wall-cooling tube, a vertically-arranged boiler casing, a screw-thread fire tube and the like. The invention changes flue direction of current water-fire tube boilers from a longitudinal flue which is horizontally returned in front and back direction to a transversal flue which is vertically returned in up and down direction. Twice large dilatancies are naturally realized before smoke enters into the flue, and the vertically-arranged boiler casing is entirely barely heated in the rear portion of the flue of the boiler. The volume of a furnace and the flue and a radiative-convective heating surface are significantly enlarged with same size and same quantity of steel consumption, a five return journey of a whole forced-circulating waterway for coal and hot water is only provided with a baffle board, and a three journey of a whole forced-circulating waterway for gas (oil) is not provided with any baffle boards. Inlet water roses slowly after entering into the boiler casing, and firstly washes an upper tube sheet, and then enters into a rising tube. The invention eliminates tube explosion, tube-plate fracture and flue abrasion, the initial discharging concentration of smoke is greatly reduced, and consumption of steel and electricity is decreased.

Description

technical field [0001] The invention relates to eight boiler series, that is, large and medium-sized vertical boiler shell type water-fire tube layer combustion, chamber combustion; 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 type 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 burst defects With fundamental improvements, the water-fire tube boiler has always oc...

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 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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