Boiler hot combustion adjustment test is an important means of boiler testing and operation. Through boiler power field test, the following four problems can be solved:
1. Providing acceptance methods for overall acceptance before cold start after boiler overhaul can create favorable operating conditions for boiler unit ignition and start-up.
2. Through comprehensive air volume measurement, calibration, and leveling tests, accurate control of burner and furnace air distribution under hot boiler conditions can be achieved.
3. Eliminate defects in the burner, analyze the characteristics of the burner and its jet, pre adjust the burner, provide direction for boiler thermal combustion adjustment, and reduce the blindness and experimental workload of thermal adjustment.
4. Through the cold state modeling test of the furnace, it is possible to visually observe whether the distribution, diffusion, disturbance, mixing, and other conditions of the airflow inside the furnace are good, verify and modify the design and operation plan, identify the causes of abnormal combustion, and find solutions.
The cold dynamic field test of boilers is considered a time-saving, labor-saving, efficient, and flexible testing method, which is widely used in today's coal-fired boilers.
The content involved in the experiment is as follows
1. Measurement of the structural characteristics of the burner: including the actual size of the nozzle outlet section; The inclination angle for installing the burner after maintenance.
2. Calibration of primary air measurement device and cold leveling test of primary air powder pipe.
Conduct a cold leveling test on the air powder duct while calibrating the air volume. Before the experiment, fully open the adjustment shrinkage holes of all primary air ducts. During the experiment, maintain the primary air flow entering the coal mill at the rated operating condition. Measure the wind speed using a standard backrest tube. If any deviation is found, adjust the adjustment shrinkage holes and level the air flow until the cold state deviation of the wind speed is maintained below ± 5%.
3. Calibration of total secondary air volume, testing of secondary air distribution and damper characteristics.
4. Measurement of furnace roundness and whether the airflow inside the furnace has eroded the furnace wall and bottom.
Adjust the air flow conditions inside the furnace to meet the test conditions. Adjustment of primary air using the calibration results of measuring the inlet air volume of the coal mill; Adjust the differential pressure between the secondary air and the furnace based on the calculated required air volume; The burnout wind is determined by the load of the test conditions. Measure the wall to wall wind speed in the combustion zone under various operating conditions using an anemometer.
Measurement of airflow velocity distribution at the outlet of furnace 5.
The measurement of horizontal flue gas velocity can provide a direct reference for determining the deviation of flue gas temperature at the furnace outlet. Adjust the air flow conditions inside the furnace to meet the test conditions, divided into 3-4 conditions, namely 50%, 75%, load, and nozzle swing angle changes.
