压降法测量煤灰的初始粘结温度

ONSET SINTERING TEMPERATURE MEASUREMENT OF COAL ASH USING PRESSURE-DROP METHOD

在自制的实验装置上,以特定的压力将3g～5g的混合煤灰在内径8mm～10mm电熔刚玉管内压制成柱状,采用2℃/min～4℃/min的温升速率和10mL/min～40mL/min的空气流量,通过测量灰柱两端的压降随温度的变化关系,绘制压差温度曲线。曲线中最大压差点所对应的温度就是混合煤灰的初始粘结温度。利用此方法测量了IHI(Ishikawajima HarimaHeavyIndustriesCO.LTD)循环流化床锅炉飞灰和秦皇岛北山热电厂循环流化床锅炉飞灰的初始粘结温度分别为900℃±10℃和1300℃±10℃,从一个侧面解释了IHI循环流化床锅炉结焦严重,无法正常运行的原因。

This paper introduces an economical and simple experimental method to measure the onset sintering temperature of mixed coal ash Under the pressure calculated from the formula ΔpL≤uηB0, the ash with mass 3?g～5?g is compressed into ash bar in an Al2O3 tube with 8?mm～10?mm inner diameter The pressure drop along with the ash bar versus temperature raised at a rate of 2?℃/min～4?℃/min temperatureincreasing rate is measured with air flow rate at 10?mL/min～40?mL/min The onset sintering temperature of mixed coal ash is the temperature at which the pressure drop reaches maximum The onset sintering temperatures of IHI CFB boiler ash and Qin Huangdao CFB boiler ash were measured The onset sintering temperature of IHI CFB boiler ash is 900?℃±10?℃, which can partially explain the phenomena of the IHI CFB boiler can not run smoothly due to the sintering of ash and slag