Oil and gas burning steam water boiler and outer wetback device thereof

Abstract

The invention discloses an outer wetback device of an oil and gas burning steam water boiler. The outer wetback device comprises a smoke chamber. The smoke chamber is enclosed by an outer wetback tube plate, side wetback plates and an inner wetback plate, the outer wetback tube plate is positioned on the front surface of the smoke chamber, the side wetback plates are positioned on two side surfaces and the lower surface of the smoke chamber, the inner wetback plate is positioned on the rear surface and the upper surface of the smoke chamber, an outer wetback plate is further arranged on an outer layer of the inner wetback plate, a cavity is enclosed by the outer wetback plate and a shell of the boiler, the smoke chamber is accommodated in the cavity, an internal space of the smoke chamber is communicated with a first return boiler furnace of the boiler and a second return smoke tube, and a cavity space on the outside of the smoke chamber is filled with to-be-heated water in the boiler. The outer wetback device has the advantages that fuel consumption can be reduced, the heat efficiency of the boiler can be improved, the running cost can be lowered, and the service life of the boiler can be greatly prolonged.

Description

technical field [0001] The invention relates to a partial structural component of a fuel-fired gas-fired steam hot-water boiler, especially an outer wet-back device of a fuel-fired gas-fired steam hot-water boiler; the invention also relates to a boiler, especially an outer wet back device Back-type fuel gas steam hot water boiler. Background technique [0002] Existing oil-fired gas-fired steam hot water boilers usually adopt a shell-type three-pass wet-back structure, and the center of the furnace can be arranged symmetrically or eccentrically. The fuel burns in the first return furnace with slight positive pressure, and the high-temperature flue gas flows backward along the furnace through the wet back combustion chamber and flows back through the second return smoke pipe, and enters the third return through the compression front smoke chamber turning 180° The smoke pipe is finally discharged through the smoke exhaust port on the rear smoke chamber. [0003] An existing...

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Problems solved by technology

However, this structure is more complicated and requires a larger volume

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