How to reduce the oxygen content in the flue gas of a heating furnace

Yeah, I want to know that too. Hehe, please help everyone

Hehe, can you stop hyping it up? This post was last edited by lioe on 2009-2-6 08:17]

Generally, the oxygen content is controlled by adjusting the opening degree of the flue dampers and the air intake volume

Monitor the oxygen content in the flue gas, adjust the air supply to the furnace in a timely manner, reduce the excess oxygen level on the premise of ensuring complete combustion, and improve the thermal efficiency of the furnace.

1. Reduce negative pressure. Controlled via fan dampers. 2. Reduce the opening degree of the damper, thereby lowering the air intake volume.

Additional note: While adjusting the dampers in a timely manner based on the analysis results of flue gas oxygen content, make sure to address any air leakage points such as the viewing ports promptly.

What was said upstairs is very correct; generally, the opening degrees of the flue dampers and air valves are adjusted by referring to the oxygen gauge

Adjust the damper to reduce air flow； Strengthen equipment leak sealing.

The oxygen content can be controlled by adjusting the opening of the flue dampers and the air intake volume; additionally, an air preheater can be used to improve the performance of the fuel gas

The main factors affecting the efficiency of a heating furnace are fuel oil, fuel gas, and air. By maintaining the correct ratio of fuel to air appropriately, minimal heat loss and maximum thermal efficiency can be achieved. If the ratio is improper and there is insufficient air, it results in incomplete combustion of the fuel, leading to increased heat loss ； If there is too much air, a large amount of heat will be discharged along with the flue gases, reducing the combustion efficiency. The indicator used to measure whether the ratio between air and fuel is appropriate is the excess air coefficient. This coefficient represents the ratio of the actual amount of air supplied during fuel combustion to the theoretical amount of air required for complete combustion. In practical combustion processes, the amount of air needed is usually greater than the theoretical value. The main factors affecting the thermal efficiency of a heating furnace are as follows: (1) The higher the flue gas temperature of the furnace, the lower its thermal efficiency ； (2) The greater the excess air coefficient, the lower the thermal efficiency ； (3) The greater the loss due to incomplete chemical combustion, that is, the more CO in the exhaust gases, the lower the thermal efficiency ； (4) The greater the mechanical incomplete combustion loss, that is, the higher the content of unburned carbon particles in the exhaust gases, the lower the thermal efficiency. The following methods can be used: 1. Use a new type of burner. The burner consists of three parts: a nozzle, an air adjustment port, and a flame channel. The nozzle atomizes the preheated fuel oil ； The air adjustment vents allow air to enter the flue and furnace, creating a swirling aerodynamic field that mixes thoroughly with the gaseified fuel oil, thereby promoting complete combustion of the fuel. The finer the mist, the more thorough the mixing, and the higher the combustion efficiency. 2. Preheat the air. Preheating the air for combustion not only recovers waste heat but also accelerates the burning rate of the fuel, thereby improving its combustion efficiency. There are many methods for preheating flue gas from recycling heating furnaces; the appropriate method should be selected based on specific conditions, along with controlling the excess air coefficient. The thermal efficiency of fuel combustion depends to a large extent on whether the air supply is appropriate. Under normal circumstances, once the burner has been determined and a waste heat recovery system is in use, the only economically viable and effective way to improve the thermal efficiency of combustion is to control the excess air coefficient. Generally, the amount of air supplied during fuel combustion must be greater than the theoretical requirement. In other words, fuel combustion must take place with a certain excess air coefficient in order to achieve high combustion efficiency. However, too much excess air will carry away a large amount of heat, reducing the furnace’s thermal efficiency. Especially when the flue gas temperature is high, the excess air coefficient has a greater impact on the furnace’s thermal efficiency. Therefore, to enable the heating furnace to operate stably over the long term under appropriate excess air coefficient conditions, it is necessary to control the total air supply to the furnace by monitoring the oxygen content in the exhaust gas using a zirconia oxygen analyzer. 4. Adjusting the atomizing steam: When a heating furnace burns fuel oil, it is necessary to use atomizing steam to turn the fuel oil into an oil-gas mixture, so that this mixture can mix thoroughly with air and burn completely. The amount of atomizing steam is proportional to the amount of fuel oil; if there isn’t enough atomizing steam, the fuel oil cannot burn completely even when the excess air coefficient is high ； Conversely, if too much vapor is generated, it will carry away a large amount of heat, thereby reducing the furnace’s thermal efficiency.

1. Is there a problem with the online analyzer? 2. The air volume is excessive. 3. Check the furnace flame to determine the oxygen level