Flameless burner control system, flameless low-NOx burner and control method thereof

Abstract

The invention discloses a flameless burner control system, a flameless low-NOx burner and a control method thereof. Through application of a control system taking an SCU460 ignition controller as a core, different actions of a plurality of sets of valves can be automatically controlled according to the flameless combustion and flameless combustion temperature conditions; automatic switching control over different working modes of flameless combustion and flame combustion is achieved, and manual switching is not required, so that the control system is easy to operate, and safe and reliable; meanwhile, the flameless combustion and flame combustion of the burner applying the system can be controlled through the SCU460 ignition controller; during flame combustion, when the furnace temperatureis lower than the set temperature, the burner is ignited by an ignition electrode, and the flame can be detected by a detection electrode; the stable and reliable low-temperature combustion process isensured; in the flameless combustion phase, when the furnace temperature is higher than the set temperature, and the ignition electrode is not ignited; gas and air are injected into a furnace for combustion, and surrounding flue gas can be entrained by high-speed airflow injected into the furnace to take part in combustion; and local high temperature of the flame is reduced greatly, and NOx is reduced quickly.

Description

technical field [0001] The invention relates to the field of burners, in particular to a flameless burner control system and a flameless low NOx burner. Background technique [0002] Flameless combustion, also known as MILD combustion, is a volumetric combustion or diffuse combustion, characterized by low reaction rate, local heat release, uniform heat flow distribution, low combustion peak temperature and low noise, high combustion compared with traditional combustion , the reaction is burned in a large area, even in the entire furnace, so that the flame front is small, and the generation of pollutants such as NOx and CO is drastically reduced. After the technology came out in the early 1990s, it was quickly applied in the iron and steel and metallurgical industries of Germany, Italy, Japan, the United States, Sweden, China and other countries. Because the technology integrates energy saving, emission reduction and environmental protection, this technology is widely used T...

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Problems solved by technology

[0004] With the increasing emphasis on environmental protection in our country, energy saving and emission reduction of industrial furnaces has become an important link. How to effectively use flameless combustion technology to reduce emissions from industrial furnaces has become a difficult problem. There are many matching valves. If all of them are controlled manually, the production cost will be greatly increased. Therefore, it is imminent to develop a simple, stable and reliable flameless combustion control method.

[0005] In addition, the existing industrial furnaces generally use conventional burners for heating, and most of them do not have a preheating system, resulting in no energy saving. Some manufacturers use external heat exchangers for energy saving. Limited by the structure of the burner, conventional burners burn at this preheated air temperature, and the NOx produced is extremely high. Therefore, how to economically and effectively transform the existing industrial furnace combustion system has become a new research for burner manufacturers. direction

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