Upward swinging angle determination method of combustor spray nozzle of pulverized coal boiler and combustion control method

Abstract

The invention relates to an upward swinging angle determination method of a combustor spray nozzle of a pulverized coal boiler and a combustion control method of the pulverized coal boiler. The determination method comprises the following steps of respectively setting the upward swinging angle value of each combustor spray nozzle for each coal type and each combustion working condition, forming different upward swinging angle values of at least two combustor spray nozzles, and according to each coal type and the upward swinging angle value of each combustor spray nozzle, adjusting and testing the combustion of the boiler, and detecting the heat deviation of left and right sides of a reheater and the temperature deviation of the reheating steam; judging if the heat deviation of the left and right sides of the reheater and the temperature deviation of the reheating steam are respectively smaller than the preset side heat deviation threshold value and the preset steam temperature deviation threshold value or not; if the heat deviation of the left and right sides of the reheater and the temperature deviation of the reheating steam are not respectively smaller than the preset side heat deviation threshold value and the preset steam temperature deviation threshold value, returning to set the corresponding upward swinging angle value of each combustor spray nozzle; if the heat deviation of the left and right sides of the reheater and the temperature deviation of the reheating steam are respectively smaller than the preset side heat deviation threshold value and the preset steam temperature deviation threshold value, determining and using the current upward swinging angle value of each combustor spray nozzle as the upward swinging angle value of each combustor spray nozzle of the boiler corresponding to current coal type and combustion working conditions. The method has the advantages that the deviation value is realized between the upward swinging angle values, and the running efficiency and economy of units and the running safety of the boiler are improved.

Description

technical field [0001] The invention relates to the technical field of pulverized coal combustion, in particular to a method for determining the upswing angle value of a burner nozzle of a pulverized coal boiler and a combustion control method for a pulverized coal boiler. Background technique [0002] With the rapid development of my country's national economy, the demand for electricity continues to grow. In order to use energy more effectively, thermal power generating units are constantly developing towards higher parameters and larger capacity. Most of the pulverized coal power plant boilers of large thermal power units in service are arranged in four corners and fired in a tangential circle. The most important feature of this tangential combustion method is that the airflow in the furnace rotates, and the fuel, air and flue gas are strongly mixed to form good combustion conditions. At the same time, due to the rotation of the air flow, the flame ignites the adjacent ...

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Problems solved by technology

However, the effect of this method on reducing the thermal deviation has a lot to do with the setting of the anti-cut air flow. If the momentum and angle of the anti-cut air flow are not properly selected, not only will the smoke temperature deviation not be reduced, but it will also cause confusion of the air flow in the furnace. Exacerbate the deviation of smoke temperature

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