Operating Conditions Prior to Inspection and Adjustment of the Auxiliary Boiler Combustion System:
1. Operation was restricted to manual mode only; during the ignition phase, the blower's air intake port had to be partially blocked with a wooden board to prevent ignition failure.
2. To prevent the emission of black smoke from the exhaust, the burner could not be operated at full load and was restricted to partial-load operation.
3. The automatic operating mode for the auxiliary boiler was unavailable.
Equipment Inspection and Fault Resolution:
1. The auxiliary boiler's fuel inlet solenoid valve assembly (consisting of two valves connected in series) was dismantled for inspection; it was discovered that the internal rubber valve diaphragms were severely aged and cracked.
2. After replacing the components with new spare parts, a test run was conducted. It was found that the auxiliary boiler still could not operate automatically, and—at the same load—the thermal output of the steam had decreased significantly.
3. The burner was dismantled and inspected, and its internal sealing components were replaced. The boiler's internal water tubes, inner walls, and heater surfaces were cleaned; combustion deposits were removed using a soot blower. The pressure drop at the exhaust outlet was measured at 90–110 mmH2O (Max. 150 mmH2O).
4. Due to the improved internal operating conditions, the fuel pump's output volume required reduction; the atomizing pressure was adjusted as follows: Before: 30 bar; Now: 25 bar.
5. During the test run, the cam limit switches were recalibrated.
6. The spacing between the nozzle, ignition electrodes, and diffuser was adjusted. The airflow velocity within the burner was regulated by repositioning the adjustment ring. During the test run, the spring linkage on the adjustable cam plate was fine-tuned to achieve the optimal air-to-fuel ratio.
7. During the testing process, the position of the connecting pin on the air damper's control rod was adjusted to enhance and amplify the displacement signal transmitted from the compound regulator.
The auxiliary boiler was subsequently tested under both fully automatic and manual control modes:
1. The thermal output proved satisfactory across all operating conditions.
2. At both partial and full loads, the smoke visible through the observation port appeared light and wispy.
3. The automatic operating functionality of the auxiliary boiler was successfully restored.
Hazards Associated with the Fault:
1. Increased fuel consumption.
2. Increased fouling within the boiler's combustion chamber, resulting in a heavier maintenance burden. 3. The loss of the boiler combustion automatic control function increases the likelihood of a major accident.
Operating Conditions Prior to Inspection and Adjustment of the Auxiliary Boiler Combustion System:
1. Operation was restricted to manual mode only; during the ignition phase, the blower's air intake port had to be partially blocked with a wooden board to prevent ignition failure.
2. To prevent the emission of black smoke from the exhaust, the burner could not be operated at full load and was restricted to partial-load operation.
3. The automatic operating mode for the auxiliary boiler was unavailable.
Equipment Inspection and Fault Resolution:
1. The auxiliary boiler's fuel inlet solenoid valve assembly (consisting of two valves connected in series) was dismantled for inspection; it was discovered that the internal rubber valve diaphragms were severely aged and cracked.
2. After replacing the components with new spare parts, a test run was conducted. It was found that the auxiliary boiler still could not operate automatically, and—at the same load—the thermal output of the steam had decreased significantly.
3. The burner was dismantled and inspected, and its internal sealing components were replaced. The boiler's internal water tubes, inner walls, and heater surfaces were cleaned; combustion deposits were removed using a soot blower. The pressure drop at the exhaust outlet was measured at 90–110 mmH2O (Max. 150 mmH2O).
4. Due to the improved internal operating conditions, the fuel pump's output volume required reduction; the atomizing pressure was adjusted as follows: Before: 30 bar; Now: 25 bar.
5. During the test run, the cam limit switches were recalibrated.
6. The spacing between the nozzle, ignition electrodes, and diffuser was adjusted. The airflow velocity within the burner was regulated by repositioning the adjustment ring. During the test run, the spring linkage on the adjustable cam plate was fine-tuned to achieve the optimal air-to-fuel ratio.
7. During the testing process, the position of the connecting pin on the air damper's control rod was adjusted to enhance and amplify the displacement signal transmitted from the compound regulator.
The auxiliary boiler was subsequently tested under both fully automatic and manual control modes:
1. The thermal output proved satisfactory across all operating conditions.
2. At both partial and full loads, the smoke visible through the observation port appeared light and wispy.
3. The automatic operating functionality of the auxiliary boiler was successfully restored.
Hazards Associated with the Fault:
1. Increased fuel consumption.
2. Increased fouling within the boiler's combustion chamber, resulting in a heavier maintenance burden. 3. The loss of the boiler combustion automatic control function increases the likelihood of a major accident.