How to Reasonably Combine Gas/Oil Burners with Boilers

How to Reasonably Combine Gas/Oil Burners with Boilers
The reasonable combination of gas/oil burners and boilers can perfectly reduce fuel consumption and reduce nitrogen oxide emissions. So how to choose a suitable gas burner or oil burner for the boiler? The following points are summarized for you by the manufacturer of the Europa burner:
1. Power
The power of the burner refers to the mass (kg) or volume (m3/h, under standard conditions) of fuel that can be burned per hour when fully burned, and also provides the corresponding thermal energy output (kw/h or kcal/hour). The boiler is calibrated for both steam production and fuel consumption. The two must match when selecting.
2. Matching of aerodynamic characteristics
A fully automatic burner of a unit is like a flame injector, injecting flames into the furnace (combustion chamber) to achieve complete combustion and output heat in the furnace; The burner manufacturer measures the integrity of the product in a specific standard combustion chamber; Therefore, standard experimental conditions are generally used as the selection criteria for burners and boilers. These conditions can be summarized as:
(1) Power;
(2) Air flow pressure inside the furnace;
(3) The spatial size and geometric shape (diameter and length) of the furnace.
The matching of aerodynamic characteristics refers to the degree to which these three conditions are met.
3. The influence of furnace size and geometric shape
For boilers, the size of the furnace space is first determined during design by selecting the heat load intensity of the furnace, which can be used to preliminarily determine the volume of the furnace.
After determining the volume of the furnace, its shape and size should also be determined. The design principle is to fully utilize the furnace volume, avoid dead corners as much as possible, have a certain depth, have a reasonable flow direction, ensure sufficient reaction time, and ensure complete combustion of fuel in the furnace. That is to say, allowing the flame sprayed by the burner to have sufficient residence time in the furnace, because although the oil mist particles are very small (<0.01mm), they have been mixed and ignited before being sprayed out of the burner, but this is not enough; If the furnace is too shallow and the residence time is not enough, incomplete combustion will occur. The lighter tail gas CO exceeds the standard, while the heavier ones emit black smoke, and the power cannot meet the requirements. Therefore, the geometric shape of the furnace mainly affects the flow resistance of the airflow and the uniformity of radiation. The boiler must undergo repeated debugging to have a good match with the burner.
4. Gas pressure inside the furnace
In an oil and gas boiler, the hot air flow starts from the burner and is discharged into the atmosphere through the furnace, heat exchanger, flue gas collector, and exhaust pipe, forming a fluid thermal process. The hot air flow generated after combustion, with the upstream pressure head flowing in the furnace channel, is like water in a river, and the water level difference (drop, head) flows downstream. Because furnace walls, channels, elbows, baffles, spurs, and chimneys all create resistance to gas flow (called flow resistance), which can cause pressure loss. If the pressure head cannot overcome the pressure loss along the way, the flow rate will not be reached. Therefore, a certain flue gas pressure must be maintained in the furnace, which is called back pressure for the burner. For boilers without induced draft devices, after considering the pressure loss along the way, the pressure inside the furnace must be higher than atmospheric pressure.
The size of the back pressure directly affects the output of the burner, and the back pressure is related to the size of the furnace, the length and geometric shape of the flue. Boilers with high flow resistance require high burner pressure. For a specific burner, there is a maximum pressure head corresponding to the maximum damper and maximum airflow state. When the intake throttle valve changes, the air volume and pressure also change, and the output of the internal combustion engine also changes. When the air volume is small, the pressure head is small, but when the air volume is large, the pressure head is high. For a specific boiler, when the inlet air volume is large, the flow resistance will increase, which will increase the back pressure of the furnace, and the increase in the back pressure of the furnace will suppress the outlet air volume of the burner. Therefore, when choosing a burner, you must understand that the power curve can be reasonably matched with a fully automatic oil (gas) burner installed on the boiler with good performance. Whether they still have the same good combustion performance largely depends on whether the aerodynamic characteristics of the two match. Only by matching well can the performance of the burner be fully utilized, ensuring stable combustion in the furnace, achieving the expected thermal energy output, and achieving good thermal efficiency of the boiler. Whether they still have the same good combustion performance largely depends on whether the aerodynamic characteristics of the two match. Only by matching well can the performance of the burner be fully utilized, ensuring stable combustion in the furnace, achieving the expected thermal energy output, and achieving good thermal efficiency of the boiler. Whether they still have the same good combustion performance largely depends on whether the aerodynamic characteristics of the two match. Only by matching well can the performance of the burner be fully utilized, ensuring stable combustion in the furnace, and achieving the expected thermal energy output, can the boiler achieve good thermal efficiency.