To ensure reliable operation of the electric heater measures the following main points:
An electric heater to optimize the design and installation, to prevent fouling the internal
Electric heating pipe blown fault is the largest number of occurrences in all faults, mainly caused by excessive internal fouling. Due to the replacement of electric heating pipe duration is longer, when the occurrence of multiple electric heating pipe blown, the heater outlet temperature will not meet the system requirements, will affect the unit load and even downtime for a long time, to bring huge economic losses. Therefore, in the selection of electric heaters, the design and installation phase of the system should focus on the internal fouling problem. The electric heater manufacturers should be asked to increase the distance between the electric heating pipe and the inner wall of the main body, and the standby electric heating is arranged in the lower part.
2 to improve the electric heater control cabinet ventilation cooling, to ensure that the surrounding working environment temperature does not exceed 25 ℃
As the SCR power regulator thyristor work when the heat and has a SCR over-temperature interlock protection trip function, when the SCR operating temperature exceeds 70 ℃ when triggering its temperature control element action, interlock contactor trip. Equipment operation due to electric heater control cabinet internal cooling problems and working environment temperature problems caused by equipment outage failure occurred. Therefore, to improve the ventilation of the electric heater control cabinet cooling, to ensure that the working environment temperature is very important. In the heater control cabinet before ordering, manufacturers should be required in the design of high-power cabinet cooling fan, to expand the air inlet area, cabinet size should be designed and reasonable enough to reserve the remaining space. Control cabinet where the power distribution room to install at least two air conditioners to ensure that the distribution room temperature maintained at 25 ℃ below.
3 to strengthen the inspection of the electric heater, to detect anomalies and handling equipment
The unit in the operation of the power generation operation personnel, equipment inspection staff and maintenance personnel should check the daily operation of the electric heater ontology and control cabinet, and do a good job with the relevant data before the same type of analysis to ensure that early detection of equipment Hidden and dealt with. (2) inspection, recording and analysis of the electric heater out, the entrance of the wind pressure, should be in the correct position of the valve should be in the correct position, can not arbitrarily change the valve status; (3) check the heater body ground wire is intact, whether the installation is connected firmly to avoid the occurrence of personal electric shock accident; (3) check the heater body grounding wire is intact, (4) Check the bottom of the SCR power regulator fan and cabinet cooling fan is running well, if the need to stop the need to immediately replace the new fan; (5) check the control cabinet where the power distribution room air conditioning is normal, (6) measuring the SCR operating temperature of the SCR power regulator, such as measuring the value close to 70 ℃ should take measures to improve the ventilation and heat to its temperature drop, if necessary, to stop the group (7) record the maximum running current of each group of electric heaters, and compared with the previous data analysis, such as the maximum running current When larger drops, the thermostat parameters can be adjusted to improve the heater power.
4 do regular maintenance and maintenance of electric heaters
During the maintenance or quiescence of the unit, the electric heater should disconnect the main power switch, followed by the relevant test and disassembly inspection work. After the unit is shut down, the electric heater should be detected immediately to ensure that the problem is detected early and that there is sufficient time for the treatment. Test items include: each group of three-phase DC resistance and insulation resistance of each phase and make a record. If the insulation resistance is found to be less than 1MΩ, the cable head should be disassembled and the insulation resistance of the cable and the heating tube should be measured separately to distinguish the cable problem or the heating tube problem. If the three-phase DC resistance is found to be unbalanced, the cable and the electric tube should be measured separately to determine the specific location and quantity. At the same time do a good job of electric heater core inspection work, remove the heater inside the fouling, cleaning the electric tube for cleaning, check the appearance of the electric tube and tightening, tighten the control cabinet connection wire, check, check the thermometer and Whether the thermostat action is normal. Before starting the unit, the insulation resistance of the heater should be measured again. If the insulation resistance of the individual group is low, it is prohibited to put the electric power into operation and prevent the electric tube or cable from being damaged. Should be passed into the media in advance, the inside of the heater dry and dry, when the insulation resistance can be put into operation after passing.
5 strengthen the training, to master the electric heater running the operating principle of standard equipment and
When the equipment appears small defects are often due to the operation of personnel, maintenance personnel on the system and equipment is not familiar with the principle, resulting in lack of timely and expand the scope of influence, it should strengthen the transport personnel, maintenance personnel training, so that they can master The working principle of the equipment, learn to understand the electrical control schematic diagram of the equipment, accurate adjustment of equipment operating parameters, so that equipment defects can be found in time to deal with.
In short, to strengthen the electric heater equipment management, careful statistical analysis of various types of failure, good preventive measures, the prevention and maintenance of maintenance together to establish and improve the relevant management system can be stable operation of the heater can bring good business The economic benefits.