高温煤灰黏度测控技术研究与实现

Research and implementation of measurement and control technology for viscosity of high-temperature coal ash

为了满足国标对测量高温煤灰黏度的要求,设计开发了高温煤灰黏度测控装置,煤灰黏温特性可为设计液态排渣气化炉提供依据。在分析黏度测量和温度控制基本原理的基础上,从结构、硬件、软件3个方面设计并实现了温度控制、数据采集与处理一体化的高温煤灰黏度测控装置。利用该装置对试验样品进行实际测试,测量数据稳定、结果可靠,温度在50~1 700℃连续可调,控温精度±2℃。通过同一样品的多次试验以及和国外设备的比对试验可以看出,煤灰黏度大于临界黏度时,相对重复性限小于20%,煤灰黏度小于临界黏度时,相对重复性限小于10%,满足GB/T 31424的要求。

In order to meet the requirements of China＇s national standard for measuring the viscosity of hightemperature coal ash,a measurement and control device for the viscosity of high-temperature coal ash is designed and developed. The viscosity-temperature characteristics of coal ash can provide design basis for liquid slag discharge gasification furnace.On the basis of analyzing the principles for viscosity measurement and temperature controlling,a set of measurement and control device for the viscosity of high-temperature coal ash is designed from structure,hardware and software,which achieves integration of temperature controlling,data acquisition and data processing.The test samples are measured in practical by this device. The results show that the measured data are stable,the measurement results are reliable,the temperature can be continuously adjustable from 50℃ to 1 700℃,the temperature control precision is ±2℃.It can be seen through several tests of the same sample and comparison test with foreign equipment that when coal ash viscosity exceeds critical viscosity,the limits of relative repeatability is less than 20%; when coal ash viscosity is less than critical viscosity,the limits of relative repeatability is less than 10%. This device can meet the requirements of GB/T 31424.