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对生物质燃烧过程硫迁徙规律进行试验研究。试验表明,硫迁徙与燃烧温度、硫赋存形式、生物质灰成分以及燃烧过程气固相反应条件等因素相关。在气固相反应条件较弱的固定床燃烧试验中,燃料中的有机硫在较低的燃烧温度(约550℃)下即可基本析出进入气相,而无机硫的析出与灰成分有很强的关联,在富含Si的甘蔗叶燃烧过程中,温度达到850～1050℃时硫析出率迅速增加,而对富含Ca且Si含量低的树皮,整个燃烧过程中无机硫析出随温度增加不明显,只有当温度超过1000℃之后由于硫酸盐的升华才开始出现一定份额的增加;在气固相反应条件较好的循环流化床燃烧中燃用同样的生物质燃料,当燃烧温度控制在800℃以下时,由于生物质灰中的K、Ca等碱性矿物质具有很好的固硫活性,源于燃料并进入气相的硫氧化物的量受碱性灰渣的抑制,燃烧固硫率能达到非常高的程度。
Experimental study on sulfur migration in biomass combustion process. Experiments show that the sulfur migration is related to the combustion temperature, the form of sulfur, the biomass ash composition and the gas-solid reaction conditions in the combustion process. In the fixed-bed combustion test, where the gas-solid reaction conditions are weak, the organic sulfur in the fuel can basically precipitate into the gas phase at a relatively low combustion temperature (about 550 ° C.), and the inorganic sulfur has a strong precipitation and ash content In the combustion of sugarcane leaves rich in Si, the rate of sulfur precipitation rapidly increased when the temperature reached 850 ~ 1050 ℃. For the bark with low content of Ca and Si, the precipitation of inorganic sulfur increased with the increase of temperature Obviously, only when the temperature exceeds 1000 ℃ due to the sublimation of sulfate began to appear a certain share of the increase; gas-solid phase reaction conditions better circulating fluidized bed combustion with the same biomass fuel, when the combustion temperature control Below 800 ℃, due to the K, Ca and other alkaline minerals in the biomass ash has a good sulfur-fixing activity, the amount of sulfur oxides originating from the fuel and entering the gas phase is inhibited by the alkaline ash, burning solid Sulfur rate can reach a very high degree.