Energy-saving coal saver

Abstract

The invention relates to an energy-saving coal saver. The energy-saving coal saver comprises a box body and a serpentine heat exchange tube. The top and the bottom of the box body are closed; a flue gas inlet for horizontally feeding flue gas is formed in the connection of the side wall and the top of the box body; a flue gas outlet for horizontally discharging flue gas is formed in the connection of the side wall and the bottom of the box body; a Venturi tube is connected to the flue gas outlet, the serpentine heat exchange tube is distributed in a zigzag shape in the box body in a reciprocated manner and is fixed to the box body through a supporting rack; a housing, defining a sealed cavity together with the outer wall of the box body is arranged on the outer wall of the box body; the serpentine heat exchange tube is provided with a water inlet which penetrates through the upper side wall of the box body to communicate with the cavity and a water outlet which successively penetrates through the side wall of the box body and the side wall of the housing from the lower part of the housing; and a water inlet tube communicating with the cavity is further arranged in the lower part of the housing. The energy-saving coal saver provided by the invention is simple in structure, high in heat exchange efficiency, long in service life, low in cost and energy-saving and environmental-friendly.

Description

technical field [0001] The invention relates to a coal economizer, in particular to an energy-saving economizer. Background technique [0002] Smoke loss is the most important heat loss in boiler operation, generally about 5% to 12%, accounting for 60% to 70% of boiler heat loss. Installing an economizer in the tail flue of the boiler can achieve the purpose of deep recovery of flue gas waste heat, increase power generation, reduce coal consumption, save desulfurization water consumption, and protect the chimney. [0003] The ordinary light tube economizer used has a complex system. Since the exhaust smoke contains a large amount of dust, when the boiler is overloaded, the concentration of fly ash and the flow rate of the flue gas will increase, and the light tube will be worn during high-speed washing, thereby reducing the cost. The strength of the tube bundle can easily cause tube bundle leakage accidents and bring potential safety hazards. [0004] Moreover, the serpent...

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Problems solved by technology

[0003] The ordinary light tube economizer used has a complex system. Since the exhaust smoke contains a large amount of dust, when the boiler is overloaded, the concentration of fly ash and the flow rate of the flue gas will increase, and the light tube will be worn during high-speed washing, thereby reducing the cost. The strength of the tube bundle can easily cause tube bundle leakage accidents and bring potential safety hazards

[0004] Moreover, the serpentine heat exchange tube of the ordinary economizer has a large heat transfer coefficient on the water side, which is much larger than that on the flue gas side. The water temperature in the tube is low, so the serpentine heat exchange tube is prone to low-temperature acid dew point corrosion, which seriously affects the service life of the equipment and the normal operation of the system

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