Abstract
In order to investigate the regularity and mechanism of corrosion related to ash deposition on the boiler heating surface during cofiring of coal and biomass, the influence of fuel property, type of metal tubes (heating surface), proportion of blended biomass, and atmosphere in the furnace was studied by using the static corrosion mass gain method with the high-temperature tube furnace system. The results indicated that the effect of biomass property on ash corrosion is greater than that of coal, which was mainly due to high content of alkali metals and chlorine in biomass fuels. The corrosion resistance of metal pipes is T91 > 12CrMoVG > 20G. T91 is the most appropriate one, and it can effectively inhibit chlorine corrosion and can be used as the ideal material for the biomass-fired boiler and the biomass and coal cofired boiler. In addition, ash deposition can significantly aggravate the corrosion of metal tubes, and the degree of corrosion tends to become significant with increasing proportion of blended biomass fuels. HCl can aggravate metal corrosion, which can be inhibited by SO2.
Highlights
Because of the depletion of fossil fuels and their environmental pollution all over the world, the development and utilization of clean renewable energy has gradually drawn more attention, in which biomass energy receives much attention for its characteristics, including easy to burn and low emission of CO2, SOx, NOx, and other pollutants [1]
Biomass fuels are generally low in heat value and difficult to collect, transport, and store. ere are problems in utilization of biomass such as high investment costs and low utilization efficiency. ese problems can be solved by the biomass and coal co-combustion technology
It can promote the gasification of the alkali metal elements in the fuel and react with alkali metals to form volatile alkali chloride in the gas phase [6]. e vast majority of gaseous alkali metals are deposited and condensed on the low-temperature metal heating surface
Summary
Because of the depletion of fossil fuels and their environmental pollution all over the world, the development and utilization of clean renewable energy has gradually drawn more attention, in which biomass energy receives much attention for its characteristics, including easy to burn and low emission of CO2, SOx, NOx, and other pollutants [1]. E high content of chlorine in the biomass and sulfur in the coal will cause serious ash deposition and corrosion problems on the heat exchange surface of the boiler, which reduce the heat transfer efficiency of the heating surface and even harm the boiler operation safety. By simulating the cofiring environment of biomass and coal, the regularity and mechanism of corrosion related to ash deposition during cofiring of biomass and coal under different fuel properties, type of metal tubes (heating surface), proportion of blended biomass, and atmosphere in the furnace were explored It provides a theoretical basis for the effective utilization of biomass fuels and the optimization of boiler operating parameters
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