Flue gas waste heat recovery and purification device for small household biomass boiler

Abstract

The invention relates to the technical field of flue gas treatment of small household biomass boilers, in particular to a flue gas waste heat recovery and purification device for a small household biomass boiler. The device is structured such that the lower end of a flue gas inlet pipe passes a top cover of a body and enters a cavity of the body, the flue gas inlet pipe is fixed to the top cover,and a drain outlet is formed in the bottom of the body; a humidifying spray pipe is arranged in the flue gas inlet pipe; a double pipe exchanger comprises a flue and a heat exchange unit, and the lower port of the flue gas inlet pipe communicates to the flue; filler is arranged around the flue gas inlet pipe and / or the double pipe exchanger; a dust removal spray pipe is arranged in the cavity of the body and is located above the filler; a fin tube heat exchanger is arranged in the cavity of the body and is located above the dust removal spray pipe; a flue gas outlet pipe is arranged on the topcover, and a liquid outlet is formed in the body below the double pipe exchanger. The device not only can recycle sensible heat of flue gas and latent heat of water vapor in the flue gas, but also can eliminate harmful substances such as soot particulates, sulfur dioxide and oxynitride in the flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment of small household biomass boilers, in particular to a waste heat recovery and purification device for flue gas of small household biomass boilers. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Efficient development and utilization of biomass energy plays an important role and practical significance in reducing greenhouse gas emissions and haze control. Corn stalks, cotton stalks, wood chips and other crop stalks or forestry residues are crushed and then extruded by a pellet machine to become biomass pellet fuels with a diameter of 6-10 cm and a length of 20-50 cm. B...

AI Technical Summary

Problems solved by technology

[0005] However, the inventors found that most of the flue gas from the current small-scale household biomass boilers has not undergone waste heat recovery and purification treatment, but is directly discharged into the atmosphere. 10-15%, the concentration of dust, sulfur dioxide and nitrogen oxides in unpurified flue gas is higher than the energy industry standard (NB / T 34006-2011): dust in flue gas≤50mg / Nm 3 、Sulfur dioxide≤30mg / Nm 3 、Nitrogen oxide≤150mg / Nm 3 emission limits

Images