Boiler maintenance and service - part two

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Boiler maintenance and service - part two

The boiler is a metal container that is in direct contact with heat and on the other hand has water, which in turn creates a heat exchange between water and fire, which increases the temperature of the water until it reaches the boiling point and It produces steam.

In this article, we will continue to review the boiler service methods when cleaning and turning off the boiler.

Methods of cleaning boilers

Boiler,service,maintenanceAll pipes can be accessed by opening the box’s front and rear smoke box.

From the front of the boiler with a special brush inside the pipes, remove any deposits and smoke. Sediment and soot usually accumulate behind the boiler. The soot and sediment associated with the pipe passage accumulate in the back chamber, and the third passage soot accumulates in the rear smoke box. These soot deposits can be easily eliminated. Removing the end door of the return chamber can then be accessed and the soot or aqueous sediment collected there is removed and thoroughly cleaned. as a result, When reinstalling the front and rear doors, make sure they are sealed and replace them if damaged.

Boiler shutdown method for a short time

You can operate one of the following ways to turn off the boiler for a specified period of time and up to one shift:

Close the boiler steam outlet valve and set the burner and power pump to automatic mode. During this time the pressure inside the boiler is maintained and ready for the next shift. As this boiler is operated without a supervisor present, it is important to contact the insurance company so that they can approve your method. Have been achieved.

Manual steam shut-off valve closing the feed pump and raise the water level to the highest point of the faucet. This is done to compensate for the contraction caused by the lowering of temperature and pressure. Turn off the pump and allow the burner to turn off at the highest set pressure. Switch off the power pump switch and torch switch.

When the burner has stopped, open it and clean while the cup is hot. Failure to do so in the hot state will cause the radiation and heat to dry and accumulate carbon deposition on the fuel cup. Close the faucet. If the boiler pressure drops during this time, it will prevent water from entering the boiler. Before starting the next boiler, be sure to open the water supply valve before starting the boiler. Control the fountain glass and water surface and clean the electric eye and flame retardant glass on the back of the boiler.

Boiler,service,maintenance

Boiler shutdown method for a long time

One of the following methods can be used to turn off the boiler for a long time:

Boiler drying method:

During boiler service When you turn off the boiler, the pipes and plates and furnace should be cleaned of fuel soot and all surfaces that are in contact with heat and combustion gas. Then open the water and then open the hand and dredge valves, then remove the sediment mud and the masses, and finally clean the inside of the boiler thoroughly. It should be noted that the inside of the boiler should be as dry and as wet as possible.

Remove the water level controlling vessels and clean and dry them from the sediment and rust shells and reinstall them. Open the air outlet and drain valves and the steam drain. The boiler can be kept dry by applying the right chemicals. During the boiler shutdown period, you should rotate the motors two or three times each week to keep the axle idle for a long time.

In case the boiler is :

If the boiler has been dehydrated before the boiler service, turn it off and try not to have any internal bubbles. Boiler water should be tested weekly and chemicals stored for water treatment should be injected at all times to prevent oxidation.

Boiler Classification

Boilers have several categories, as listed below:

 

Boiler Classification by Water and Steam Cycle Pressure:

In terms of operating pressure, there are generally three types of boilers:

Miniature boilers with a maximum pressure of 2 bar for the production of hot or dry water and saturated with a maximum heat exchange surface of 1 m²

Classification of boilers in terms of industrial and metallurgical materials:

Boiler,service,maintenanceThe American Society of Mechanical Engineers (ASME) has stringent standards for powerful boilers made of low carbon, alloy, and high alloy steels.
Low-pressure boilers are made of cast iron or steel and miniature boilers are made of copper or stainless steel.

Classification of boilers in terms of heat exchange levels:

first of all, This type of boilers classification is provided by the American Steel Boilers Institute (SBI) for non-power low-capacity steel boilers, which divide them into three categories:

also,  From 1 m² to 5 m² heat exchange surface, with outputs of 1 to 5 KJ

another,  Heat exchange level from 1m² to 5m² with a maximum output of 1kj

furthermore,  Fossil fuel boilers with a maximum output of 1 KJ

finally, However, it is clear that the heat exchange levels of power boilers are much higher than these values.

Classification of boilers by tube content:

Fire-tube boilers: Boilers in which fire and gases from combustion flow through the pipes and boil the energy of the receiving fluid (water) outside the pipes.

Water-tube boilers: Boilers in which the fluid receiving energy (water) flows through the pipes and combustion products move out of the pipes.

Fire-tube boilers are manufactured to a maximum of 2bar pressure with an output of 1.2 m³ / hr.

Classification of boilers taking into account the pressure inside the boiler furnace:
three categories:
Pressure boilers, atmospheric pressure boilers, and boilers.

In addition, the type of boiler furnace in terms of internal pressure has created devices such as blowers and inhalers of smoke and gases. It also depends on the furnace

pressure, the exhaust system of the chimney will be variable.

Classification of boilers by type of combustion:

first of all, Boilers are divided into two categories according to the type of combustion.
Boiler Segmentation by Type of Combustion:
1-Boiler with internal combustion
In boilers with internal combustion, the furnace has a burner and accessories for combustion
2-External combustion boiler.
In an external combustion boiler, the combustion results of other systems are discharged and therefore their energy is used to boil water.

Boilers Energy Classification:

The energy converted in boilers may come from the combustion of fossil fuels. It is also possible that the heat supply of the fluid may undergo a chemical transformation other than combustion. In some boilers, electrical energy is the driving factor behind the increase in operating fluid temperature. It may even come from nuclear energy sources. In this case, the structure of the boilers will have major differences.
Classification of boilers by type of operating fluid:

The boiling agent that absorbs and boils in boilers may be water, water vapor or mercury.

Seasonal boiler program:

Firstly, clean the burner thoroughly and check for leaks.
Secondly, clean the pass pipes 2 and 3 (if soot in the pipes) with a special brush.
Thirdly, with all safety considerations, open the man and hand valves, check the inside of the boiler for complete deposition and rust.

Boiler,service,maintenance

Finally a few tips for maintaining an industrial boiler

Keeping the boilers properly is one of the most important things to make the most of it. All pressure vessels, including industrial boilers, may suffer damage such as scaling and loss of energy if not properly maintained.

certainly, Regular and periodic boilers cleaning

Dirt, shells and other forms of waste can cover the inner surface of the boilers tubes, reducing boiler efficiency, slowing heat transfer, and increasing the likelihood of fracture.

first of all, Boilers maintenance

also, Reduction of the Bladan Boiler

In fact, the best way to prevent the formation of such sediments is to open and shorten the bottom of the boilers.

also, Bladen drainage regularly

another, Water quality monitoring and management

furthermore, Insulation Insulation

finally, Provide regular and accurate boilers service and maintenance reports

The best way to ensure the boiler is working properly is to maintain accurate service and maintenance reports.

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