Center back-burning vertical type three-pass gas-fired boiler

Abstract

The invention discloses a center back-burning vertical type three-pass gas-fired boiler. The boiler comprises a barrel, a boiler furnace, a combustor, smoke tubes, spiral steel sheets, a smoke collection box, an upper reversal smoke chamber, a lower reversal smoke chamber, a water inlet pipe, a water outlet pipe, a smoke exhaust pipe, a spring and a base. The center back-burning vertical type three-pass gas-fired boiler is characterized in that the combustor is located at the top end of the vertical type boiler barrel, a nozzle faces the boiler furnace in a downward mode, and the boiler furnace is formed by installing and welding the barrel and an ellipsoidal head; the combustion mode of flames in the boiler furnace is a center back-burning mode, the flames rotate naturally in the boiler furnace along the ellipsoidal head, and thus a first pass of smoke is formed; the upper end of the boiler furnace is connected with the upper reversal smoke chamber, and the second pass smoke tube around the boiler furnace is connected with the upper reversal smoke chamber and the lower reversal smoke chamber; and the smoke collection box is located on the upper side of the upper reversal smoke chamber and is connected with the lower reversal smoke chamber through the third pass smoke tube. The boiler is compact in structure, combustion space inside the boiler furnace is widened, the radiation heat exchange amount of the boiler furnace is increased, the smoke passes are prolonged, and heat exchange area of the smoke tubes and boiler water is increased obviously.

Description

technical field [0001] The invention relates to a vertical gas boiler, in particular to a central backfired vertical three-pass gas boiler. Background technique [0002] The furnaces of the vertical hot water boilers available in the market today are all arranged at the lower part of the boiler. The space of the furnace is relatively narrow. The gas emitted by the burner is limited by the area of ​​the furnace. It is discharged, and the heat energy loss is relatively large. In addition, traditional vertical gas-fired boilers mostly have a fire tube single-return structure, which has problems such as short flue gas flow, small heat transfer area of ​​the smoke tube, and low convective heat transfer coefficient of the fluid inside and outside the smoke tube, which makes the heat released by fuel combustion It cannot be fully absorbed, resulting in high boiler exhaust gas temperature and low boiler thermal efficiency. According to statistics, the exhaust gas temperature of tr...

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Problems solved by technology

[0002] The furnaces of the vertical hot water boilers available in the market today are all arranged at the lower part of the boiler. The space of the furnace is relatively narrow. The gas emitted by the burner is limited by the area of ​​the furnace. is discharged, and the heat energy loss is relatively large

In addition, traditional vertical gas-fired boilers mostly have a fire tube single-return structure, which has problems such as short flue gas flow, small heat transfer area of

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