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(2) Prevent PLC control system power failure:
The power supply of the bag filter PLC control system must be redundantly configured. Generally, a set of UPS power supply 2000VA can be added for another 30min to prevent system power initialization caused by factory power supply interruption or low voltage, so that the dust collector cleaning system cannot be started or The protection malfunctions the deduster. For the DC 24V power supply system supplying external circuits, multiple branch fuses or switches must be installed according to the effect of different loops to prevent the external loops from being grounded or short-circuited to cause interruption of all DC 24V power supplies.
(3) Realize the information exchange with the boiler master control monitoring system: The bag dust collector is a relatively independent system. The PLC should be able to transmit its operating status and main parameters to the boiler master control monitoring system in real time. The master control operator station should have independent Monitoring screen. The operating conditions of the boiler, in particular the logic of 234, 56 and so on, shall be alarmed by light words on the control screen of the precipitator, so that both systems can obtain the necessary information in a timely manner and take corresponding measures.
2, the requirements of the protection system (1) spray water cooling system:
When the inlet fume temperature of the precipitator reaches “170°C, the solenoid valve of the sprinkler system shall be reliably opened. The water pressure and water quality of the sprinkler system shall meet the requirements. The position of the nozzle shall be selected properly, and the water spray and the flue gas shall be fully mixed ( It usually takes a few seconds to reduce the local condensation or corrosion. The water spray volume should be adjusted to 28L/s to avoid affecting the temperature of the flue gas.
(2) Bypass protection system:
The role of bypass protection and the conditions for investment and return have been introduced. It should be noted that the jamming of the bypass door should be given enough attention. Regular transmissions should be inspected regularly to clean up the accumulated dust to prevent lax closing and opening. The phenomenon occurs. When the temperature of the flue gas is too high or the pressure difference between the filter bag is greater than the set point, the bypass door is jammed and the furnace is immediately shut down.
(3) PLC protection chain circuit:
The interlocking loops realized by the PLC must be regularly driven and tested, in particular the spray water cooling circuit, the air preheater accident trip interlocking loop and the high temperature 234 loop. Transmission tests should simulate actual conditions to ensure their reliability.
3. Inspection and Replacement of Filter Bags Filter bag should be inspected when the following problems occur: sudden increase of flue gas flow rate, increase of backflush frequency, serious oil pollution, increase of dust emission concentration, and short-time overheating. After the inspection, the filter bags should be evaluated for degradation and replaced as necessary.
When the differential pressure is higher than 2.1 for a long time, it means that the service life of the filter bag has expired and should be replaced. In general, each time the filter bag is replaced. When replacing the filter bag, care must be taken not to damage the filter bag, even if it is a minor injury. When using electricity and welding, there should be protective measures and do not allow the welding slag to fall into the filter bag.
The basic knowledge of boiler bag filter maintenance and repair More details Inquiry: Hebei Wuyang Environmental Protection Equipment Co., Ltd.
Basic knowledge of boiler bag filter maintenance and inspection requirements for PLC control system (1) Anti-wear, anti-corrosion and cold-proof of measuring elements: For inlet temperature of bag filter, thermocouple measurement, selection of ash bucket ash measurement element must be considered Material wear and corrosion problems. A wear-proof baffle must be installed at the front of the mounting position of the thermocouple to prevent damage to the measuring bag due to damage to the measuring element or inaccurate signal transmission. In addition, due to the cold weather in the north, the filter bag differential pressure transmitter and sampling tube must be equipped with an electric heating cable or other insulation measures. Heat or heat should be uniform, the power must be reliable, prevent condensation or transmitter damage.