First of all, to check the oil and gas boiler body, focus on checking whether the boiler body is leaking, boiler scale, flue carbon deposit, boiler leakage and flue chimney is smooth, if found problems, to take the corresponding maintenance measures in time.
Secondly, the oil and gas boiler should be descaled regularly, and the following methods can be chosen:
1.When the boiler is shut down for a short time, it is more convenient to use the wet method for maintenance.First of all, the water in the hot water boiler drain, remove the scale and dirt in the boiler, close all valves and holes of the boiler, into the boiler into the softened water, the preparation of sodium hydroxide or trisodium phosphate dissolved into the boiler;Then heat the water in the boiler to 100°C using a small flame and let the gas out.When boiler water flows out of the air valve, close the air valve, water supply valve, furnace door and baffle to seal the boiler.Alkaline solutions are generally prepared by adding 5-8kg sodium hydroxide or 10-12kg trisodium phosphate per ton of water.
2.When the boiler is shut down for a long time, dry maintenance is more appropriate.First, drain the water in the boiler, remove the scale and dirt in the boiler, pour softened water into the boiler, with a small fire to raise the pressure of the boiler to 0.1MPa, and then stop burning;When the furnace temperature and pressure drop, open the drain valve again, discharge the boiler water, use the waste heat of the boiler to dry the boiler;Then put a desiccant in the furnace, close all valves and orifices, and seal the boiler.The desiccant generally uses quicklime or silica gel.The amount of quicklime is 2 ~ 3kg per cubic meter, and the amount of silica gel is 1 ~ 3kg per cubic meter.Desiccant should be placed in an open container, and evenly placed;After that, check every 1 to 2 months.The silica gel can be dried and reused after expiration.
3.Maintain the valves, pressure gauges, thermometers and automatic exhaust valves on the hot water network.Check the anti-corrosion coating and insulation on the surface of the pipeline, the indications of pressure gauges and thermometers, single flow valves, cut-off valves, automatic exhaust valves and manual exhaust valves at the end, and repair and replace any problems found.
4.Clean hot water pipe network of boiler to prevent corrosion.Drain the hot water pipe network, check the water quality, replace the softened water, etc., carry out wet maintenance on the whole hot water pipe network, and close all valves after filling the softened water.
5.The maintenance of oil and gas boiler burner is mainly to clean the internal carbon deposit of the burner, clean the burner nozzle, clean the fan, clean the control device and so on, and seal the burner with plastic bags.
6.Maintain circulating pumps and feed pumps of oil and gas boilers, check, repair and replace bearings, water seals, noise, wiring, etc.;At the same time, add lubricating oil to the manual disc pump, clean up the oil and dust on the surface of the pump, and cover it with plastic.
7.Maintain the water softener equipment, whether the water softener is running normally, whether the salt tank and hose are leaking, whether the resin is effective, and repair immediately if any problem is found;After repair, remove the power plug of the water softener, discard the salt tank in the salt water, and seal the connecting pipe between the water softener and the salt tank with tape.