Flue gas dedusting energy-saving device for boiler

Abstract

The invention discloses a flue gas dedusting energy-saving device for a boiler, comprising a heat exchanging unit and a dedusting unit, wherein the heat exchanging unit is provided with a high-temperature flue gas inlet, a low-temperature flue gas outlet and a heat exchanging space arranged between the high-temperature flue gas inlet and the low-temperature flue gas outlet, a plurality of heat exchanging pipelines are distributed in the heat exchanging space, and fluid bodies for exchanging heat with flue gas circulate in the heat exchanging pipelines; the dedusting unit is provided with a dust flue gas inlet and a dustless flue gas outlet, and the dust flue gas inlet is directly communicated with the low-temperature flue gas outlet of the heat exchanging unit. The heat exchanging pipelines are divided into at least two layers, three or more heat exchanging pipelines are provided in each layer, wherein the moving direction of the heat exchanging pipelines in different layers rotate for an angle of 30-60 DEG relative to the moving direction of the heat exchanging pipelines in the adjacent layer according to the sequence from the high-temperature flue gas inlet and the low-temperature flue gas outlet, and the heat exchanging pipelines located in the same layer are mutually paralleled. The energy-saving device of the invention integrates lowering flue gas discharging temperature and reducing discharge of dust in flue gas into a whole, has compact structural arrangement, and effectively saves the space of a boiler room.

Description

technical field [0001] The invention relates to an energy-saving device, in particular to a device for removing dust from boiler flue gas and recovering waste heat of the flue gas. Background technique [0002] At present, the exhaust gas temperature of a large number of boilers is very high. If the flue gas is directly discharged into the atmosphere, it will not only waste a lot of energy, but also cause thermal pollution to the surrounding environment, so it is necessary to recycle the waste heat of the flue gas. [0003] As disclosed in Chinese Patent No. 95201022.4, a flue gas purification and energy-saving device includes a smoke box, a half partition and an air-gas heat exchange element in the upper half of the smoke box, an air intake pipe in the upper left part of the smoke box, and an air intake pipe in the upper right part of the smoke box. There is an exhaust pipe, and there is a gas-solid separation element at the lower left of the smoke box, and an ash collecti...

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Problems solved by technology

However, it can be seen from the above that the layout of the components of the above-mentioned patent is not compact enough, and the heat exchange unit and the dust removal unit are not integrated, resulting in a large space occupation; in addition, the design of the heat exchange unit is too simple, and it is difficult to fully reduce the smoke exhaust. temperature, increase boiler efficiency

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