Porous-medium gas hot water heater

Abstract

The invention discloses a porous-medium gas hot water heater, relating to a heater in which a pipe is wound into a spiral form to separate the continuous flows of water and a heating medium; the heater is structurally characterized in that: fine-pore porous medium materials are filled in an anti-backfire channel and a groove of a water cooling sleeve; macropore porous medium materials, which are metal fibers or foamed ceramics, are filled in a combustion chamber; heat exchanging tubes exchange heat directly with the macropore porous medium materials in the combustion chamber to conduct radiation or or heat exchange with the form of heat conduction, and high temperature fume realizes strong heat exchange between the peripheral dense heat exchanging tubes and the macropore porous-medium materials and leads the fume to be cooled rapidly and steam to condense directly on the tube walls; therefore, the heat conduction of the combustion chamber is strengthened and the heat released by the combustion can be rapidly and effectively transferred to water so that the steam in the fume condenses to recycle the condensation heat of water, thus realizing the goal of ultimately absorbing the heat released by the combustion. The hot water heater has simple structure and heat efficiency of over 96 percent, meeting the Grade-I energy efficiency standard for household rapid water heaters.

Description

technical field [0001] The technical proposal of the present invention relates to a heater that separates the continuous flow of water and heating medium by a spirally wound pipe, in particular a porous medium gas water heater. Background technique [0002] With the intensification of the energy and environmental crisis, countries all over the world have put forward higher requirements for energy efficiency and environmental pollutant emissions. Energy saving and emission reduction is an important task put forward by my country's "Eleventh Five-Year Plan". At present, the thermal efficiency standard for gas water heaters requires a minimum of 84%. In order to improve the efficiency of gas-fired water heaters, almost all existing technologies adopt the method of increasing the area of ​​the heat exchanger, that is, by adopting the form of finned tubes, or by increasing the flue gas condensation heat exchange surface to make the exhaust gas temperature lower than 100 °C , in...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a porous medium gas water heater, which is filled with porous medium in the combustion chamber, and the heat exchange tube directly performs heat exchange in the form of radiation and heat conduction with the high-temperature porous medium in the combustion chamber, and the high-temperature flue gas is in its periphery Intense heat exchange is realized in the spiral channel between the dense heat exchange tubes and the porous medium, so that the flue gas is quenched and the water vapor is directly condensed on the tube wall, thus overcoming the large volume and complex structure of the existing gas water heater, and the combustion chamber Disadvantages of insufficient combustion intensity and heat exchange intensity

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