洁净煤技术

2020, v.26;No.126(02) 145-151

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煤粉工业锅炉运行数据与供料参数的相关性研究
Study on the correlation between operation data and feed parameters of pulverized coal industrial boiler

刘振宇;
LIU Zhenyu;China Coal Research Institute Company of Energy Conservation;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

摘要(Abstract):

供料参数的定量测量是锅炉实现自动调节的重要前提。目前直接测量设备受浓度测量范围、成本等因素影响,对工业锅炉适用性有限,而锅炉现有各传感器的部分数据与供料系统关系密切。为了探究根据传感器数据计算供料参数的可行性,以1 Hz频率收集了天津华苑1台58 MW锅炉的传感器数据,在控制其他变量的条件下筛选中间仓重量、一次风总压、锁气阀转速、炉膛压力、烟气氧含量等与供料相关的数据,通过最小二乘法、决定系数等分析方法,定量计算变量绝对值、标准差与供料参数的关系。结果表明,当中间仓进料阀关闭时,可通过中间仓称重以高准确度计算供料器300 s内的平均供料量;使用供料锁气阀转速计算供料量,基于锁气阀填充率和填充密度为定值的假设,低转速下供料曲线符合该假设。但随着锁气阀转速提高,供料量随转速的增长速率以二次曲线规律边际递减,且递减规律存在个体差异;一次风总压计算供料量属于差压法,用于计算供料量时,调整后的决定系数R_(Adj)~2>0.98,具有较高的准确性,但需要根据每台设备的累计运行数据计算系数k;炉膛负压波动可较好反映供料波动,但准确性低于使用一次风总压,取样时间为30 s时,供料量标准差-炉膛压力标准差R_(Adj)~2达到最大值,为0.890 1;供料量-耗氧量的R_(Adj)~2在取样时间200 s时达到最大值0.296 1,供料量标准差-耗氧量标准差R_(Adj)~2在取样时间10 s时达到最大值0.640 8,说明耗氧量用于推断供料波动的可靠性中等,推断供料量的可靠性较差,这可能与该锅炉煤粉的掺混比例不稳定使单位质量煤粉热值波动较大有关。
The quantitative measurement of feeding parameters is an important prerequisite for automatic regulation of boiler. At present,most kinds of direct measuring equipment have limited applicability to industrial boilers due to the influence of concentration measuring range,cost and other factors.However,some of the sensor data of boiler have a significant relationship with the feeding system.In order to explore the feasibility of using these sensor data to calculate feed parameters,the sensor data of a 58 MW boiler in tianjin huayuan were collected at a frequency of 1 Hz.Under the condition of controlling other variables,the data related to the feed such as the weight of the intermediate bin,the total pressure of the primary air,the speed of the air lock valve,the pressure of the furnace and the oxygen content of the flue gas were screened out,and the relationship between the absolute value and standard deviation of the above variables and the feed parameters were quantitatively calculated by the least square method and the determination coefficient method.The results indicate that When the feeding valve of the intermediate bin is closed,the average feeding quantity within 300 s of the feeder can be calculated by weighing the middle bin with high accuracy.If the filling rate and filling density of the air lock valve are fixed,the feeding quantity can be accurately calculated by using the feeding speed of the air lock valve.The feeding curve at low speed conforms to this assumption.With the increase rate of the rotational speed,the marginal value of the feed decreases at the edge of the quadratic curve,and there are individual differences in the decline rule.The calculation of the total primary air pressure is a differential pressure method,and when the total primary air pressure is used to calculate the feed quantity,the adjusted determination coefficient R_(Adj)~2>0.98,and the calculation accuracy is very high.The disadvantage is that the coefficient k needs to be calculated based on the cumulative operation data of each device.The fluctuation of negative pressure in furnace can better reflect the fluctuation of feed,but the accuracy is lower than the total pressure of primary air.When the sampling time is 30 s,the standard deviation of supply-the standard deviation of furnace pressure R_(Adj)~2 reaches its maximum value of 0.890 1.The R2 Adjof the feedstock-oxygen consumption reached a maximum value of 0.296 1 at the sampling time of 200 s,and the R_(Adj)~2 of the standard deviation of feed-standard deviation of oxygen consumption reached its maximum value of 0.640 8 at the sampling time of 10 s.It indicates that oxygen consumption is of medium reliability in inferring feed fluctuation,while inferring feed quantity is of poor reliability,which may be related to the instability of the boiler pulverized coal mixing ratio is not stable,resulting in the unit weight of pulverized coal calorific value fluctuations.

关键词(KeyWords): 煤粉锅炉;供料;锁气阀;氧含量;炉膛压力;一次风总压;中间仓称重
pulverized coal boiler;feed;air lock valve;oxygen content;furnace pressure;total pressure of primary air;intermediate chamber weighing

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基金项目(Foundation): 天地科技股份有限公司科技创新创业资金专项项目面上项目(2019-TD-MS010)

作者(Author): 刘振宇;
LIU Zhenyu;China Coal Research Institute Company of Energy Conservation;State Key Laboratory of Coal Mining and Clean Utilization;National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control;

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