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How to choose a low nitrogen burner?
How to choose a low nitrogen burner? Many manufacturers are sometimes at a loss. Below small small make up from the type of low nitrogen burner, choose the factor that low nitrogen burner considers, answer to everybody how low nitrogen burner chooses?

Type of low nitrogen burner

Burner is an important equipment in industrial fuel boiler and gas boiler, which ensures the stable ignition of fuel and the complete combustion of fuel. Therefore, to suppress the production of NOx, it must start with burner. According to the combustion technology of reducing NOx, low-nitrogen oxide burners are generally divided into the following categories:

1. Low NOx precombustion chamber burner

Precombustion chamber development research in China in recent 10 years is a kind of high efficiency and grade of low NOx combustion technology, generally speaking, a precombustion chamber of the wind or secondary air and fuel injection system, etc, the mixed fuel and a wind, in a form in the combustion zone precombustion indoor fuel mixture, due to the lack of oxygen, is only part of the fuel combustion, fuel in poor oxygen and low flame temperature of a flame volatile precipitation in the area, thereby reducing NOx formation.

 2. Stage burner

The phase burner designed according to the principle of graded combustion makes the fuel and air burn in different stages. As the combustion deviates from the theoretical equivalence ratio, the generation of NOx can be reduced.

3. Self recirculation burner

One is to use the pressure head of combustion-supporting air to absorb part of the burning smoke back into the burner and burn it with the air. Due to the recirculation of flue gas, the heat capacity of flue gas is large, the combustion temperature is reduced, and NOx is decreased.

Another kind of self-recirculation burner is to put part of the flue gas into the recirculation directly in the burner and add the combustion process. This kind of burner has the dual effect of inhibiting nitrogen oxide and saving energy.

4. Thick and light type burner

The idea is that some of the fuel is burned too much, and some of the fuel is burned too little, but the total amount of air over the air remains the same. Since both parts are burning away from the chemical equivalence ratio, the NOx is very low, which is also called deviation combustion or non-chemical equivalent combustion.

5. Split flame burner

The principle is to divide a flame into several small flames. As the small flame has a large heat dissipation area and a low flame temperature, the "heat reaction NO" decreases. In addition, the small flame shortens the residence time of oxygen, nitrogen and other gases in the flame, and has obvious inhibition effect on both "heat reaction NO" and" fuel NO".

6. Mixed accelerator burner

The residence time of flue gas in the high temperature area is one of the main factors influencing NOx production. Improving the mixture of combustion and air can reduce the thickness of the flame surface. The mixed - boost burner is designed according to this principle.


2. Main parameters considered in the selection of low nitrogen burner

1. Adjustable ratio

Low nitrogen burners with electronic proportional regulation should usually have a high adjustable ratio of at least 5 to 1. A lower tunable ratio means more ON/Off stops during the actual operation and more gas consumption. Unless it is a boiler loaded in a relatively small stable range all year round, it is important to select a high adjustable ratio burner to reduce gas consumption, reduce operating costs, and extend the service life of the equipment.

2. NOx emission

It is necessary to meet the requirements of national and local environmental protection emissions. On the premise of meeting the requirements, from the perspective of corporate social responsibility, the equipment with lower NOx emissions should be selected as far as possible.

3. Tail oxygen content

In order to reach the maximum excess air coefficient of full combustion, which is about 1.1, the theoretical tail oxygen content is about 2%. A higher tail oxygen content usually means a reduction in burner efficiency. The optimal tail oxygen content of the ideal burner can be controlled within 3%. The tail-oxygen content of combustion burners on the market's surface is usually around 7%, which means the same amount of heat is produced, compared with 3% of tail-oxygen content, which requires about 6-8% more natural gas to be consumed. For the owners who operate all year round or whose equipment is under high load for a long time and whose natural gas consumption is relatively high, it is very important to select a burner with low tail oxygen content to reduce the operating cost.

4. Other major considerations

Combustion stability is the main consideration for selecting low nitrogen burners, including the reliability of the equipment itself. From the perspective of combustion stability, for low nitrogen burners using FGR technology, special attention should be paid to the ratio of flue gas recirculation of FGR. Too large a proportion means that the combustion is easy to be unstable, or there are strict requirements on the technology and control level of the equipment.

For more information on low nitrogen burners, please consult Beijing chuangwei electromechanical equipment co., LTD.

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