Four stages of industrial application technology of gas low nitrogen boiler burner

　　The industrial application technology of gas low nitrogen incinerator is divided into the following four stages:

　　Stage 1:

　　The characteristic of early incineration technology is to advance the burning rate of fuel under the condition of guaranteed incineration consolidation, but the decomposition of NOx production and risk is not high.

　　Stage 2:

　　With the development of incineration mastering technology and the request of environmental protection department for NOx mastering, the industry first decomposes to the skill of cooling flame appearance temperature, which can effectively reduce NOx occurrence. At this stage, the low nitrogen incineration technology represented by staged incineration was first applied in a wide range, and the question of NOx emission scale at that time was handled very well. This technology is still widely used in Europe, China, Japan and South America, because of its low NOx production and low CO emission through staged incineration. However, the level of NOx production by staged incineration is quite different. Taking en676 as an example, based on incineration technology and construction level, NOx emission can be divided into three grades: 170mg / m3, 120mg / m3 and 80mg / m3, which are suitable for different emission scales.

　　Stage 3:

　　Under the pressure of improving atmosphere quality, a Southern California NOx emission scale of 60 mg / m3, the incinerator household first applies the application of flue gas recycling (FGR) in the incinerator, the ancient graded incineration and flue gas acquisition technology are widely used, and in a period of time to deal with the question of NOx and harsh scale.

　　Stage 4:

　　In 2003, Southern California once again announced the decision to advance the NOx emission scale of natural gas. In the initial stage of the industry, the management plan generally accepts lean incineration and premixed incineration to master the mind, that is, through pumping a large number of redundant atmosphere to lower the temperature of the flame area, to complete ultra-low NOx emission. However, with the high tide of power cost, the problem of large heat loss of exhaust gas has become increasingly prominent, resulting in the incinerator industry has to continuously develop new technology of high takeover by the owner, and consider NOx emission and power compliance. Based on this consideration, the technology coupling of staged incineration, FGR flue gas recycling and premix based on the inevitable low nitrogen incineration technology has become the general trend of ultra-low nitrogen incineration technology.

　　Low NOx gas boiler (low NOx emission boiler)

　　With the new atmosphere pollution emission scale (gb13271-2014) and local atmosphere pollution emission scale version in China, the low nitrogen oxide (NOx) scale in the boiler is becoming more and more severe, while the old scale, the new scale and the cover are 25% - 50%, and Beijing new scale (Draft) request the implementation date of nitrogen oxide (NOx) 60 mg / m3, April 1, 2016, nitrogen oxide (NOx) 30 mg / m3 Rice.

　　On the one hand, the scale of boiler environmental protection is becoming more and more severe, while the domestic boiler industry has not made great progress in incineration technology. At present, the NOx emission of large-scale steam boiler in China is still at a high level. According to the inspection and statistics of the national gas industry boiler, only 35% of the boiler whose NOx emission quality concentration is less than or is 200mg / m3 is in this situation.

　　Full premixed boiler is a kind of low nitrogen and low oxygen emission boiler. In ancient times, the method of incineration was that the gas and atmosphere were divided into two parts by the incinerator and dispersed into the boiler, and the mixture of them was burned at the same time.

　　Full premixed incineration is to mix the gas and atmosphere in proportion in advance through inclusion assembly, and send the gas after inclusion into the special incineration cylinder for incineration, which has the characteristics of high incineration temperature, short flame and thorough incineration.

　　Full premixed incineration is the current research and development trend of thermal incineration!

　　Ultra low nitrogen incineration technology of steam boiler

　　Three focus technologies of ultra-low nitrogen incineration

　　1. High coupling technology of incineration and steam boiler

　　The simulation plan of steam boiler under different working conditions is carried out by adopting the fulente mathematical simulation technology. Through many experiments, a low nitrogen boiler with high coupling between incineration and furnace body was designed.

　　2. Full premixed incineration technology (FPB Technology)

　　Thorough premixed incineration refers to the assembly of specially planned incinerators and inclusions. Before combustion, gases and atmosphere are thoroughly mixed and put into a special incinerator for incineration

——Author：ebico