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1. How to calculate the operating load of the boiler
The calculation of the operating load of the boiler mainly depends on the monitoring of fuel consumption, and the specific method is as follows
1. Natural gas boiler: Check the consumption of the gas flow meter: First, it is necessary to obtain the consumption of the natural gas boiler for a certain period of time. Calculate load percentage: Divide the actual gas consumption by the rated gas consumption of the boiler, and then multiply it by the ratio of the actual natural gas calorific value to the rated natural gas calorific value of the boiler to obtain the load percentage of the boiler. The formula is: load percentage=×. Attention: When calculating the consumption, the possible return oil should be subtracted to ensure the accuracy of the calculation results. 2. Coal fired boilers or boilers without fuel metering: Use steam flow meters. For coal fired boilers or boilers without direct fuel metering equipment, the steam flow rate can be monitored through a funnel to estimate the load. Although the flow rate and load may not be completely accurate in the short term, in the long run, steam flow can be an effective indicator for evaluating boiler load. Long term monitoring: Due to the potential impact of various factors on short-term steam flow, it is recommended to conduct long-term monitoring to obtain more accurate load data. In summary, the calculation method for boiler operating load varies depending on the type of boiler and fuel, but the core idea is to evaluate the actual operating load of the boiler by monitoring fuel consumption or steam flow.
2. Calculating the main steam flow rate of power plant boilers using the first stage pressur
The core method of calculating the main steam flow rate of power plant boilers using the first stage pressure is based on the principle of energy balance, which calculates it through changes in feedwater flow rate and enthalpy value.
. This method is directly integrated into the power plant DCS system, and in practical engineering applications, calibrated flow meter data can be directly read. 1. Calculation principle and method: The calculation of boiler main steam flow disturbance is usually carried out using the heat balance method, with the formula: D_ms=D_fw × (h3 fw_out - h3 fwin)/(h3 ms - h3 fw), where: - D_ms: main steam flow rate (t/h) - D_fw: feedwater flow rate (t/h), which needs to be corrected by temperature and pressure compensation - h3 fwin: inlet feedwater enthalpy value of the economizer (kJ/kg) - h3 fw_out: outlet feedwater enthalpy value of the economizer (kJ/kg) - h3 ms: main steam enthalpy value (kJ/kg). The first stage pressure (usually referring to the outlet pressure of the economizer) is used to calculate h3, which needs to be combined with temperature parameters. Obtain accurate enthalpy value by checking the water vapor meter with a median value2. Key parameter acquisition - Feedwater flow rate: measured using an orifice plate or nozzle flowmeter, density compensation is required (formula: D_fw=K × √ (Δ P × ρ), K is the instrument coefficient) - Enthalpy value calculation: according to GB/T 8117.2-2014《 Thermal Performance Acceptance Test Code for Power Station Steam Turbine ", using IAPWS-IF97 formula for water vapor properties calculation - pressure measurement: accuracy requirement ≥ 0.075 level, pressure transmitter installation position should avoid eddy current interfer