一种风量的软测量方法研究
Research on a Soft Measurement Method for Air Volume
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摘要:
对于现阶段风量测量系统往往存在一些问题，导致风量测量不准确或计算不精确的现状，现提出一种基于氧量-热量的风量软测量方法。首先，通过烟气成分分析的过程，推导出了用烟气中的氧量计算风量的公式，然后，用煤的发热量来代替公式中的热量，最后，用给煤量进行动态补偿，使公式计算所得到的结果与实际风量有相同的动态响应速率。通过在一台600 MW机组上进行实验，对公式进行验证，然后对比软测量所测的量和实际风量在不同工况下的曲线发现，这个基于氧量-热量的软测量方法，可以很好地反映实时风量，且准确度高，响应速度好，可满足现场的需要。对于现阶段无法准确地测量风量的问题，这种软测量方法可以有效地解决，并可以在电厂中广泛地应用。 Abstract:Currently, there are often some problems in the air volume measurement system, which leads to air volume measurement and calculations inaccurate. Therefore, a method for measuring air volume based on the amount of oxygen and heat was proposed. First of all, through the process of smoke composition analysis, the formula for calculating the air volume using the amount of oxygen in the flue gas was derived. Then, the calorific value of the coal was used instead of the heat in the formula. Finally, the amount of coal was used for dynamic compensation. The result of the formula calculation had the same dynamic response rate as the actual air volume. By conducting an experiment on a 600 MW unit, the formula was verified, and then comparing the measured volume of soft measurement with the actual air volume under different operating conditions, the oxygen-heat-based soft-sensing method was found to be very good. The real-time air volume was reflected, and the accuracy was high and the response speed was good, which can meet the needs of the site.For the problem that air volume cannot be accurately measured at this stage, this soft measurement method can be effectively solved and widely applied in power plants.
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