基于Deltav系统判断粉煤气化炉炉温的一种新方法

A New Method to Judge the Temperature inside Pulverized Coal Gasifier Based on Deltav System

某厂原设计采用蒸汽法判断粉煤气化炉反应室温度,由于煤质波动、渣流动层厚度变化、煤线稳定性、锅炉给水温度等工艺指标变化,导致蒸汽法指示炉温失效,操作人员无法控制炉温,多次出现气化炉渣口堵渣、水冷壁烧穿、烧嘴罩泄漏等工艺事故。基于Deltav控制系统以及改造原设计放射源测量水汽管线密度计的位置,某厂尝试以热负荷法判断气化炉炉温。改造完成后,操作人员能够快速判断气化炉反应室温度,运行3年以来,杜绝了气化炉炉温指示不准确引发的各种问题,极大提高了气化炉运营在线率。

The steam method,designed for a certain plant to judge the temperature inside the reaction chamber of its pulverized coal gasifier,fails due to fluctuations in coal quality,thickness of flowing slag layer,stability of coal line,boiler feed water temperature and other process parameters.As a result,operators cannot control the temperature of the furnace,leading to such process accidents as repeated slag plugging at the slag discharge of gasifier,burn throughs in the water-cooled wall,and nozzle leakages.The plant tried to determine the furnace temperature of the gasifier by the heat load method,based on the Deltav control system and by modifying the originally designed location of the radioactive source to measure the densitometer in the water vapor line.After the modification,operators can quickly judge the temperature of gasifier reaction chamber.Over the past 3 years since the operation,various problems caused by inaccurate indication of gasifier temperature have been eliminated,and the online rate of gasifier has been greatly improved.