The industrial application of low nitrogen gas burners can be divided into the following four stages

　　The industrial application of low nitrogen gas burners can be divided into the following four stages:dx4Boiler Burner

　　Phase 1:dx4Boiler Burner

　　The characteristics of early combustion technology are to increase the burning rate of fuel on the premise of ensuring stable combustion, but the understanding of NOX generation and harm is not high.dx4Boiler Burner

　　Phase 2:dx4Boiler Burner

　　With the increase of the industrialization level of combustion control technology and the request of environmental protection department for NOX control, the industry began to realize that cooling the flame surface temperature can effectively reduce the production of NOX.At this stage, low nitrogen combustion technology represented by stage combustion began to be applied on a large scale, which well solved the problem of NOX emission standard at that time.The technology is still widely used in Europe, China, Japan and South America because it effectively reduces the production of NOX and reduces the level of CO emissions through staged combustion.However, the control level of NOX from fractional combustion varies greatly.Taking EN676 as an example, according to the level of combustion technology and equipment, NOX emission can be divided into three grades: 170mg/m3, 120mg/m3 and 80mg/m3, which are applicable to different emission standards.dx4Boiler Burner

　　Pollution emissions. JPGdx4Boiler Burner

　　Phase 3:dx4Boiler Burner

　　Under pressure to improve ambient air quality, a southern California nox emission standard of 60 mg/m3, the burner industry began to use flue gas recirculation (FGR) modifications in the use of burners, traditional fractional combustion and flue gas recovery techniques were widely used, and over time the problem of nox and strict standards were resolved.dx4Boiler Burner

　　Stage 4:dx4Boiler Burner

　　In 2003, southern California again announced plans to raise NOX emission standards for natural gas.The early industrial solutions generally adopt the lean combustion premixed combustion control idea, that is, by pumping in a large amount of excess air to reduce the temperature of the flame zone, to achieve ultra-low NOX emissions.However, with the increase in energy prices, the problem of high heat loss from exhaust has become increasingly prominent, leading to the burner industry having to continue to develop new technologies that are highly acceptable to owners, taking into account NOX emissions and energy efficiency.Based on this consideration, technical coupling such as fractional combustion, FGR flue gas recirculation and premix based on certain low-nitrogen combustion technology has become the general trend of the development of ultra-low nitrogen combustion technology.dx4Boiler Burner

　　Low NOX gas boiler (low NOX emission boiler) working principledx4Boiler Burner

　　Along with our country new air pollutants emission standards (gb13271-2014) and local air pollutant emission standard version, in boiler of low nitrogen oxide (NOx) is more and more strict, standard and old standard, the new standard of nitrogen oxide and covered in 25% ~ 50%, and the Beijing new standard (draft) "requirement standard implementation date of nitrogen oxide (NOx) 60 mg/m3, on April 1, 2016, nitrogen oxide (NOx) 30 mg/cubic meter.dx4Boiler Burner

　　On the one hand, the boiler environmental standards are more and more strict, and the domestic boiler industry has not made great progress in the combustion technology.At present, NOx emission of most boilers in China is still at a high level.According to the testing and statistical analysis results of national gas-fired industrial boilers, only 35% of boilers with NOx emission mass concentration less than or equal to 200mg/m3 are in this state.dx4Boiler Burner

　　Fully premixed boiler is a boiler with low nitrogen and low oxygen emission.The traditional way of combustion is to diffuse the gas and air into the boiler through the combustion machine, and then mix the combustion.dx4Boiler Burner

　　Full premixed combustion is the pre-mixing of gas and air in proportion through the mixing device, and the mixed gas is sent to the special combustion cylinder for combustion, which has the characteristics of high combustion temperature, short flame and complete combustion.dx4Boiler Burner

　　Full premixed combustion is the current hot combustion research and development direction!dx4Boiler Burner

　　Boiler ultra-low nitrogen combustion technologydx4Boiler Burner

　　Three core technologies for ultra-low nitrogen combustiondx4Boiler Burner

　　1. High coupling technology between combustion and boilerdx4Boiler Burner

　　The fuente mathematical simulation technology is used to simulate the boiler under different working conditions.Through several experiments, a low nitrogen combustion boiler with high coupling of combustion and furnace body was designed.dx4Boiler Burner

　　2. Full premixed combustion technology (FPB technology)dx4Boiler Burner

　　Fully premixed combustion refers to a specially designed combustion machine and mixing device that completely mixes gas and air before ignition and puts them into a special burner for combustiondx4Boiler Burner