Counter current heat exchanging water-fire tube boiler capable of saving energy and protecting environment

Abstract

The invention relates to a counter current heating exchanging water-fire tube boiler capable of saving energy and protecting the environment, which comprises a boiler shell, a containing box, a convection tube, a smoke-fire tube, a smoke separating wall, a combustion chamber and a convection tube flue, wherein high-temperature flue gas with two return trips firstly passes through a position with higher water temperature at the water side of the smoke-fire tube in the boiler shell for exchanging heat, then lower-temperature flue gas with three return trips passes through the convection tube with lower temperature at the water side of the convection tube flue for exchanging heat, and the flue gas is discharged out of the boiler body after the heat exchange; the original downstream heat exchanging means is completely changed; counter current heat exchange is realized; energy sources are saved; carbon dioxide emission is reduced; the purposes of saving energy and protecting the environment are achieved; the counter current heating exchanging water-fire tube boiler can be produced by adopting a normal boiler production technology; and the reconstruction of an existing boiler can be realized by only changing the flow of the flue gas.

Description

technical field [0001] The invention relates to a design and manufacturing technology of a water-fire tube boiler, in particular to a countercurrent heat exchange energy-saving and environment-friendly water-fire tube boiler. technical background [0002] At present, the commonly used water-fire tube boiler is composed of a pot shell, a header, a convection tube, a water-fire tube, a smoke partition wall, a combustion chamber, and a convection tube flue. Most of the heat exchange methods are divided into three return passes. The radiation heat exchange surface with the highest combustion temperature in the combustion chamber of the boiler is one return pass; the high temperature flue gas heat exchange surface is two return passes; the low temperature flue gas heat exchange surface is three return passes, and the low temperature flue gas is discharged out of the boiler body after heat exchange. The combustion chamber of the water-fire tube boiler widely used now is one return...

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Problems solved by technology

There are no reports of countercurrent heat exchange, energy saving and environmental protection water fire tube boilers

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