Industries cannot exist without steam boilers. In one way or another, they are involved in all production processes, from manufacturing and food production to chemical and energy engineering. However, their high efficiency is often associated with significant fuel consumption. The need for industries to reduce fuel consumption is increasing due to high energy prices and the aspiration to reduce emissions.
Reducing fuel consumption does not require the replacement of the entire set of equipment with a more efficient one. You can achieve stable results without spending millions of dollars on new, high-efficiency industrial steam boilers. The article will discuss ways to reduce the fuel consumption of an industrial boiler.
1. Regular Technical Maintenance of the Equipment
The first step to reduce fuel consumption is to establish a regular maintenance schedule. Poor maintenance can cause dirt and soot to accumulate on boiler surfaces, reducing heat-transfer efficiency.
In addition, improper boiler operation due to a lack of maintenance can lead to higher fuel consumption and errors in the burner, water level, and other components. A high degree of boiler automation allows remote control of most processes, which makes it possible to quickly detect and eliminate problems.
It is recommended to carry out regular boiler maintenance, as this will prolong its life and prevent expensive repairs. During maintenance, heat transfer surfaces, burners, combustion chambers, and other components should be inspected. It is also necessary to study the technical documentation and follow the recommended guidelines for maintenance and repair.
2. Increasing the Efficiency of Combustion
Improving the efficiency of the boiler also means enhancing the quality of the combustion process. One of the simplest ways to do this is to adjust the fuel supply and air. The correct balance between the supply of air and fuel is significant for efficient steam boiler operation. The excess air in the boiler can lead to additional heat loss through the chimney, and the lack of oxygen can cause incomplete combustion and jeopardise the safety of the equipment.
To identify inefficient combustion, a boiler operator should pay attention to the colour of the flame and the state of the smoke gases. If the flame is not steady or uniform, or if the gases are dark, this indicates inefficient burning. The solution to this problem is to adjust the air-to-fuel ratio. To do this, the boiler operator should conduct a combustion audit and determine the excess air. Then, using the data obtained, he can calculate the optimal ratio.
It is important to note that the adjustment of the air-fuel ratio should be carried out by qualified personnel who will be able to correctly determine the problem and find the solution.
3. Reduction of Heat Losses
Another way to reduce fuel consumption is to reduce the amount of heat loss. Heat loss occurs when heat is lost during the transmission process through the insulation. The main “culprits” for this may be poorly insulated pipes, valves, and tanks. In addition, insulation may be damaged, allowing hot steam to escape.
To avoid this, a boiler operator needs to ensure that all components are correctly insulated. There is a standard insulation material designed specifically for insulating high-temperature surfaces. However, it is important to remember that pipes carrying steam are a priority insulation area, even though they are subject to frequent damage and leakage.
Paying attention to these details will probably allow you to find some areas that are not insulated and need special attention. After all, an industrial boiler will likely have a higher efficiency rating if the heat loss is reduced.
4. Utilising Heat Recovery Systems
The exhaust gases of industrial boilers, which are guided through the chimney, are a source of heat loss. A heat recovery system can recoup some of this energy and use it to preheat the boiler feedwater, thus reducing fuel consumption.
The economiser is a rather simple procedure. It increases the efficiency of the boiler and helps to reduce the costs of the company in the future. The heat recovery system can be used if the steam boiler works stably and its productivity is constant.
It is necessary to consult a boiler professional to determine whether an economiser would be a good choice for your steam boiler. The choice of an economiser depends on many factors, such as the temperature of the exhaust gases, the characteristics of the water that enters the boiler, and the presence of space to install the economiser.
5. Water Quality Control
The quality of water that enters the steam boiler affects not only its efficiency but also the integrity of the system. The presence of lime in the water leads to scaling, which accumulates on the inner walls of the boiler and interferes with heat transfer. As a result, the system needs to make more effort to heat the water, which leads to additional fuel consumption.
Scale buildup narrows the flow channels, increasing the pressure in the boiler and causing it to heat up. In the end, this may lead to the boiler’s rupture and shutdown of the entire production. Therefore, the primary task of the personnel is to ensure the absence of scale and other deposits on the inner walls of the boiler.
To get rid of the scale, it is necessary to carry out a descaling procedure – thermal or mechanical. In order to prevent scaling, the boiler operator needs to conduct a proper water softening procedure. This can be done by removing calcium and magnesium ions from the water using special chemicals.
Moreover, it is necessary to carry out the blowdown procedure in accordance with the requirements of the local boiler program. The blowdown allows you to remove some of the water with dissolved ions from the boiler.
6. Optimisation of Steam Pressure and Operational Parameters of the Boiler
If steam pressure is higher than necessary, it leads to increased energy costs and higher consumption of the boiler fuel. It is necessary to measure the pressure and carry out calculations for the current productivity of the equipment. It is recommended to analyse the operational parameters of the boiler at different times of the day to see how the pressure changes.
When selecting the necessary pressure, it is important to remember that there must be enough steam pressure for the machines to work properly. Besides, some industrial processes require a specific temperature and pressure of steam, which must also be taken into account.
Another step to optimise the operation of the boiler is to ensure that the fuel is only burned when necessary. A boiler operator should monitor the demand for steam and ensure that the boiler is not running when it is not needed. Turning off the industrial boiler when it is not in use will significantly reduce fuel consumption.
7. Ensuring the Proper Functioning of Steam Traps
Among the ways to reduce the consumption of fuel by the boiler, a special place belongs to the steam traps, which ensure the removal of condensate from the steam lines. Their main function is to capture moisture that forms as a result of steam cooling. In addition, they prevent the loss of live steam. If the trap is faulty, the boiler will work inefficiently, which will lead to additional fuel consumption.
Steam traps also reduce the risk of water hammer and boiler damage due to moisture in the lines. In order to prevent such a situation, the steam traps must be subject to regular maintenance and inspection. The replacement and repair of faulty parts will allow the boiler to work more efficiently.
8. Implementation of Automated Monitoring and Control Systems
The latest automated monitoring and control systems can be very helpful in reducing the consumption of fuel by a boiler. The use of special sensors makes it possible to monitor changes in the state of the system, such as the amount of fuel consumed, the productivity of the boiler, the temperature of the exhaust gases, and the level of water in the boiler. After that, this information is processed and presented to the user in a visual form.
By analysing the data provided, the boiler operator can quickly detect any deviations that may indicate a malfunction. Moreover, fuel-saving systems allow automatic control of the boiler. This eliminates unnecessary boiler operation when there is no need for steam.
Therefore, equipping the boiler with monitoring and control systems is a rather promising direction. The transition to automatic control is most appropriate if the boiler is used on an ongoing basis or if there are multiple industrial boilers.
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