Integrated flue gas condensing waste heat recovery boiler

Abstract

The invention relates to an integrated flue gas condensing waste heat recovery boiler, and belongs to the field of heating equipment, in particular to an oil-fired and gas-fired two-return-stroke shell type hot water or steam condensing boiler. The technical scheme of the invention is as follows: an air inlet of a plate-fin type air pre-heater is connected with a blower, and an air outlet is connected with the air inlet of a burner; a flame hole of the burner is connected with the left end of a hearth, and the shell of the hearth is of a corrugated flue; the right end of the corrugated flue is of a corrugated flue top, and the corrugated flue top is communicated with the front wall of a back smoke box by a convection tube bank; the back smoke box is communicated with a convection heating surface, and the convection heating surface is communicated with a front smoke box; the front smoke box is communicated with a flue gas inlet of the air pre-heater, and the flue gas outlet of the air pre-heater is communicated with a flue gas inlet of a condenser; and the flue gas outlet of the condenser is communicated with a smoke exhaust port, and the parts and the boil shell form an integrated structure. The invention has the advantages: the air pre-heater, the flue gas condenser and the boiler are integratively designed, so that the whole structure of the boiler is more compact, the corrosion-resistant ability is strong, the equipment is safer, the use is stable and reliable, and the service life is longer.

Description

technical field [0001] The invention belongs to the field of heating equipment, in particular to a fuel and gas condensing two-pass shell-type hot water or steam condensing boiler. Background technique [0002] Boiler is a kind of heating equipment, which uses oil or gas as fuel, and generates heat through combustion to produce steam or hot water. For boilers fueled by natural gas, the flue gas emitted has a relatively high temperature (150-250°C), and contains about 15-19% water vapor (volume composition), which is the main carrier of the heat of the flue gas. If the exhaust gas temperature of the boiler is lowered to a sufficiently low level, the superheated water vapor in the flue gas will condense and release the latent heat of vaporization, and the boiler that can recover the latent heat of vaporization in the flue gas is called a condensing boiler. Traditional condensing boilers usually install a flue gas waste heat recovery device at the flue gas outlet to heat the b...

AI Technical Summary

Problems solved by technology

[0003] 1. The condenser adopts serpentine tube, which has low heat exchange efficiency, large volume and large steel consumption

[0004] 2. The condenser adopts steel-aluminum composite finned tubes, the interior is carbon steel, and the external part in contact with the flue gas is aluminum, which is composited together by extrusion. This kind of finned tubes has poor corrosion resistance (condensed water is in the form of Weakly acidic, with certain corrosion), short service life

[0005] 3. The condenser adopts stainless steel finned tube, which has a long service life, but the cost is high

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