Abstract: In Xinjiang region of China,the reserves of high alkali coal are huge.However,the primary minerals of coal in this region contain a large amount of alkali metals such as Na and K,which results in that such coal types cannot be directly burned in Xinjiang.Many power plants have to mix other coal to meet the normal operation of the boiler,which greatly limits the extensive use of the coal.The boiler technology of liquid slag discharge cyclone furnace combustion is a boiler technology that causes most of the ash produced by coal combustion to form a liquid slag film in the cyclone burner and is discharged from the bottom of the boiler.It has certain advantages in solving the problem of strong contamination and slagging of high alkali coal in Xinjiang.In order to study the characteristics of capturing alkali metal in the liquid slag horizontal cyclone furnace by using Xinjiang high alkali coal liquid slag,in this paper,a liquid slag horizontal cyclone test furnace under laboratory conditions was built.And the combustion experiment of coal from Shaerhu in Xinjiang was carried out,and the ash sample collected in the horizontal liquid slag discharge cyclone test furnace during the experiment was analyzed by SEM-EDS,and the solid alkali rate of the alkali metal in the ash sample was calculated according to the analysis results.During the experiment,the formation of liquid slag on the inner wall of the furnace was observed and the temperature distribution in the furnace was measured and analyzed.The research results show that: after the test conditions are stable,the overall temperature distribution in the cyclone furnace is relatively uniform.Shaer Lake coal is suitable for liquid slag discharge horizontal cyclone combustion furnace. When the combustion temperature is1 300 ℃,liquid slag begins to form in the cyclone furnace.With the increase of the combustion temperature,the formation of liquid slag in the furnace is more obvious.When high alkali coal is used in the horizontal liquid slag discharge cyclone furnace and the liquid slag is formed in the furnace,the Fe element in the liquid slag will stick to the surface of the aluminosilicate particles and increase its viscosity and enhance the ability of the sintered layer to capture ash particles and promote the growth of the slag layer.The use of horizontal liquid slag discharge cyclone furnace with high alkali coal can effectively alleviate the problem of fouling and slagging on the inner wall of the furnace,and the mitigation effect of the high temperature combustion area is more obvious than that of the low-temperature combustion zone.When high alkali coal is burned in the horizontal liquid slag discharge cyclone furnace,the capture efficiency of the liquid slag to alkali metals Na and K can reach more than 50%,and the highest can reach 61%,which is higher than its own solid ash and the capture efficiency of Na by adding kaolin in high temperature area.