After a period of use, the fireman should maintain the gas hot-water stove in his work. Maintenance is for the better work of the gas hot-water stove and can extend the service life. Yuyuan hot-air stove has arranged three maintenance methods for your reference. Through the above three methods to maintain the hot blast stove, the choice of maintenance methods should be based on the use of gas hot blast stove status, can not be blindly carried out, if the fireman can not complete, it is necessary to consult the relevant staff to help complete, prolong the use time of hot blast stove.
1. Pressure maintenance 适用于生产备用热风炉或停运进行短暂检修时间不超过一周的热风炉。
It is suitable for producing hot air stoves with a standby hot blast stove or shutdown for a period of no more than one week.
After stopping the furnace, all the furnace water is discharged, the scale and slag in the furnace are cleaned up, and qualified softening water is added again.
(2) Heating furnace water with small fire regularly or using steam from adjacent hot stoves regularly, so that the temperature of furnace water in hot stoves should be kept at ambient temperature + 10 C in summer and not frozen in winter, closing all vent valves, drain valves and drain valves to prevent water leakage.
3. Regular supply of water in hot blast stove keeps the pressure in the hot stove 0.05MPa~0.1MPa to prevent air from entering the boiler.
Two. Wet maintenance
Wet maintenance is generally suitable for maintenance of hot blast stove with no more than one month's shutdown time.
1. When the furnace is stopped, drain the scale, slag and soot clearly according to the prescribed time.
Close all manholes, hand holes, valves and so on, and completely separate from the running hot stove.
(3) Preparing alkaline protective solution with qualified softening water, adding Na OH 8 kg~10 kg per ton of furnace water, NaC03 20 kg or Na2P03 20 kg.
4. Use the special pump to inject the prepared alkaline maintenance solution into the hot blast stove.
(5) When the protective solution is fully injected, open the water supply valve and fill the hot blast stove with qualified softening water until the water overflows from the air valve. Then close the air valve and the water supply valve and open the special pump cycle to make the solution mix evenly.
During the whole maintenance period, the external drying of heating surface should be maintained by micro-fire oven regularly, the pump circulation should be opened regularly, so that the concentration of solution everywhere is the same, and the solution test and supplementary liquid should be taken regularly, so that the PH value of solution is between 10 and 12, to ensure the alkalinity of furnace water.
In winter, corresponding measures should be taken to prevent frostbite.
Three, dry maintenance
Dry maintenance is suitable for stopping the stove for a long time, usually more than a month, especially in summer stoppage of heating hot water hot blast stove.
1. After the furnace is stopped, the furnace water is exhausted, and the scale, slag and heating surface of the furnace are clear.
(2) Close the valves on the water supply pipes, water supply pipes and sewage pipes of the hot blast stove, or close them with partitions, so as to completely isolate them from other running hot blast stoves.
(3) Open manholes and hand holes to make the hot stove dry naturally. If the hot stove is wet, use a light fire to dry the main body, wall and flue.
Select suitable desiccant. Commonly used desiccants are anhydrous calcium chloride (CaCl2) and quicklime (CaO 2). CaCl2 is placed quantitatively at 2 kg per cubic meter of water volume, requiring the selection of particles of about 15 mm; quicklime is placed quantitatively at 3 kg per cubic meter of water volume, requiring the selection of blocks of 10 mm to 30 mm.
(5) After drying, the tray with desiccant is put into the hearth and pot drum to absorb moisture. It is required that the desiccant should not contact directly with the heating surface of the hot blast stove.
(5) Drying agent should be checked periodically once a month in hot stove to see if the heating surface is corroded or not, change the failed drying agent in time, and check every half month after a month.
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