Compound water circulation system in corner tube-type hot-water boiler

Abstract

The invention discloses a compound water circulation system in a corner tube-type hot-water boiler, and overcomes the defect of high power consumption by adopting a forced circulation mode because the low temperature corrosion of a tube on a heating surface is easy to cause in a common hot-water boiler which adopts a natural circulating mode. The compound water circulation system is formed by combining a natural circulation part and a forced circulation part, wherein the natural circulation part consists of a boiler barrel, a descending tube, an ascending tube and a natural circulation upper colleting box; the forced circulation part consists of a lower collecting box, a flag-type heating surface, a forced circulation upper collecting box, and an outlet water collecting box; and simultaneously, a water partition part provided with a backflow channel is arranged in the boiler barrel. The compound water circulation system has the advantages of compact structure, small volume, low cost, high thermal efficiency, low power consumption and the like, and is widely used in hot-water boiler systems.

Description

technical field [0001] The invention relates to a water circulation system in a boiler, in particular to a composite water circulation system in a corner tube hot water boiler. Background technique [0002] Generally, in traditional hot water boilers, most of the furnace and convection heating surface adopt the natural circulation method. Since the boiler as a whole adopts the natural circulation method, the temperature of the medium in the convection heating surface at the tail is low (close to the return water temperature). The temperature of the flue gas is also low, so the wall temperature of the heating surface is often lower than the dew point temperature of the flue gas, resulting in low-temperature corrosion of the tubes on the heating surface. However, there are also some hot water boilers that use forced circulation, but the boiler cycle efficiency of forced circulation generally reaches about 2 to 3. Since the circulating water volume of the hot water boiler is la...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a composite water circulation system (hereinafter referred to as the composite water circulation system) in the corner-tube hot water boiler to solve the low-temperature corrosion of the heating surface tubes that are easy to be caused by the natural circulation of the general hot water boiler. The defect of the forced circulation method consumes a lot of power

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