The main contents are as follows:

I. Maintenance

1, pressure gauge, water level gauge (see the right figure), safety valve, sewage discharge device, water supply valve, steam valve, etc. , check whether its performance meets the requirements and whether other valves are in good condition.

2, automatic control system, including flame detector, water level, water temperature detection, alarm device and various interlocking devices, display control system and other performance status is in line with the requirements.

3. Water supply system, including water level of water storage tank, water supply temperature and water treatment equipment. Whether status is a symbolic requirement.

4, fuel combustion system, including fuel reserves, transportation lines, combustion equipment, ignition equipment, fuel cut-off device, oil pump and other conditions are in line with the requirements.

Second, sewage discharge.

Before blowdown, the boiler water level was at a normal high level, and the boiler pressure was 0. 1-0.2MPA. Based on the principle of "frequent blowdown, less blowdown and even blowdown" (at least once a day), the blowdown valve was closed immediately after opening, and then opened again after closing, and so on for several times until the water level was at a normal low level. Remember not to empty the boiler.

The pressure gauge, safety valve and other safety accessories of the boiler should be checked regularly to ensure their reliability (the pressure gauge should be checked at least once every six months and the safety valve should be checked at least once a year).

After the horizontal oil-fired (gas-fired) boiler runs continuously for 12 months, it is necessary to open the smoke box door to clean up the ash accumulated in the furnace or the smoke pipe, check whether the cement in the smoke box has fallen off, and repair the fallen off.

Third, clean.

At least once a year, remove the floating rust on the exposed parts such as the base and paint it.

Scaling and corrosion problems will inevitably occur after long-term operation of boilers. These problems, due to the generation of scale, make the heat transfer worse and lead to the reduction of boiler efficiency.

Therefore, it is difficult to achieve the rated evaporation; And because of poor heat transfer and overheating of metal, the furnace tube bulges and even explodes under the pressure of the boiler; Deterioration of heat transfer increases fuel consumption, operation cost and boiler life. Therefore, after the boiler scales, necessary measures should be taken to remove the scale.

Extended data

Common accidents and their causes

1, incomplete combustion

Incomplete combustion of fuel caused by excessive fuel composition makes combustible materials accumulate on the heating surface of GAH.

Boilers mainly include purchased residual oil, cracked residual oil and raffinate C4 fuel, which are heavy in composition, high in viscosity, low in spontaneous combustion point, easy to separate carbon when burning, poor in crushing ability when fuel vapor is atomized, high in macromolecular oil droplets, and easy to block the nozzle of oil gun, which often affects the atomization quality and combustion effect of fuel.

If the combustion adjustment is improper, the air volume is insufficient or unreasonable, and the process conditions fluctuate, the carbon black combustion is incomplete, and it is too late to produce black smoke. Oil particles that are not completely burned in the furnace are carried to the GAH heat exchange surface at the tail of the boiler by flue gas and begin to deposit.

2, frequent purging ignition

Frequent purging and ignition provide sufficient conditions for the ignition of deposited combustible materials in the boiler.

In the process of boiler ignition, the flue gas flow rate is low, and the oxygen content in the combustion system space is much higher than that in normal operation. For example, boiler B is continuously ignited and purged several times, and unburned combustible materials with residual heat are rekindled because there is enough excess oxygen.

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