含盐有机废液焚烧煤灰熔融特性试验研究

研究3种不同灰熔融性的煤(元宝山褐煤、崔家沟烟煤、徐州烟煤,分别简称为Y煤、C煤和X煤)与不同含盐率(碱金属钠盐Na2SO4、NaNO3、Na2CO3等在红水中的含量,通称含盐率)化工废液红水混合焚烧的灰熔融特性。研究结果表明,在不添加石灰石时,随着红水含盐率的增加,X煤、C煤的灰熔融温度均呈下降趋势,其中在相同的含盐率下X煤的灰熔融温度下降较多,Y煤的灰熔融温度则呈先下降后增加再下降的趋势;添加石灰石(Ca/S=2.0)后,随着红水含盐率的增加,X煤的灰熔融温度呈先下降后增加的趋势,且在红水含盐率为10%处其4个特征温度均存在一个最小值,而C煤和Y煤的灰熔融温度变化情况与不加石灰石时类似,但变化幅度相对较小;在一定的含盐率(15%)下,X煤和C煤的灰熔融温度均随着石灰石量的增加,先下降后增加,但X煤的变化明显,Y煤的变形温度、软化温度增加,而半球温度和流动温度则先下降后增加。研究结果为含盐有机废液在流化床中焚烧时防止床料结焦提供理论依据。

Experimental Study of Coal-ash Fusion Characteristics Obtained from the Incineration of Salty Organic Waste Liquid

Studied are the ash fusion characteristics obtained from the mixed incineration of 1.three types of coal(Yuanbaoshan-origin lignite,Cuijiagou-origin bituminous coal and Xuzhou bituminous coal,hereinafter referred to as Coal Y,Coal C and Coal X for short respectively),which have different ash fusion characteristics,and 2.chemical waste-liquid red water with different salt contents(the content of alkali metal sodium salt Na2SO4,NaNO3 and Na2CO3 etc.in red water,hereinafter generally referred to as the salt content).The study results show that if no limestone is added,the ash fusion temperature of Coal X and C tends to go down as a result of an increase in salt content of the red water,during which under an identical salt content,the ash fusion temperature of Coal X drops by a relatively big margin and that of Coal Y tends to go down at the beginning and then go up followed by a go-down.After limestone(Ca/S=2.0) has been added,with an increase in the salt content of the red water,the ash fusion temperature of Coal X displays a tendency to first fall and then rise and there exists a minimum value among its four characteristic temperatures when the salt content of the red water is 10%.By contrast,the ash fusion temperatures of Coal C and Y undergo a change similar to the case when no limestone is added.However,the above change is relatively small.At a certain salt content(15%) and with an increase in added amount of limestone,the ash fusion temperature of Coal X and C will all first go down and then up,but for Coal X there is a significant change.The deformation and softening temperature of Coal Y rises while its hemispheric and flow temperature goes down first and then up.The research results provide a theoretical basis for the prevention of coking of bed materials when organic salty waste liquid is fired in a fluidized bed.