Reducing the Impact of Pollution on Heating Surfaces in Low-Power Solid Fuel Heat Generators

Abstract

. The research of providing thermal efficiency of convective surfaces in heating solid fuel boilers by periodically cleaning them has been performed in the article. Various factors that influence the degree of contamination of heat exchange surfaces, which are flushed by the combustion products, are analysed. Possibilities of decreasing their negative impact are shown. The construction of heat generators with low heat production, which convective packs mainly provide one- or two-way horizontal motion of flue gases, have the problem of increase the contamination of surfaces, especially when the intensity of the combustion process is changing. Low frequency of cleaning led to the trouble following trouble. Initial loose contaminants, which are easily cleanable, transform into dense formations. Therefore, it is difficult to achieve the required surface cleanliness and, accordingly, an acceptable coefficient of thermal efficiency. The inefficiency and complexity of manual cleaning and the feasibility of using mechanized cleaning of convective surfaces of heating solid fuel boilers of low thermal efficiency have been substantiated. The constructive scheme of solid fuel heat generator with mech-anical cleaning of a vertical tubular convective package by combined turbulizers of special design are de-scribed. A comparative analysis of the economical efficiency of the solid fuel boiler with a heat output of 0.63 MW are carried out. The operating efficiency will increase by 0,6…1,4 % dependent on the actual heat load. Accordingly, the fuel amount and the air pollution by flue gases will decrease. The frequency of cleaning of convective surfaces with mechanized devices is increased, which ensures the uniformity of the existing heat load during long operation. The introduction of this class of boiler equipment is promising in the municipal en-ergy sector to reduce the complexity of servicing and saving fuel resources.