The key features of low NOx incineration technology are: mature technology, low investment and operation price. In countries with the most severe NOx emission requirements (such as Germany and Japan), low NOx incinerators are adopted to reduce more than half of NOx before flue gas denitrification, and no imported by low NOx denitrification method is adopted. Concentration, reducing investment and operating prices. Low NOx incineration technology is a widely accepted, relatively simple and economically useful technology among all kinds of low NOx emission technologies at present, but there are certain limitations in their reduction of NOx emissions. Because low incineration temperature and reduction of oxygen concentration in flue gas are not conducive to the process of coal incineration, all kinds of low nitrogen incineration technologies must be based on the conditions that they will not affect the consolidation of incineration, will not cause the erosion of the heating surface by the restorative atmosphere, and will not increase the carbon content of fly ash in a reasonable way, and the low-level steam boiler will obey.
Five systems of incinerator:
1. Air supply system: the function of the air supply system is to send the atmosphere with certain wind speed and breeze into the incineration chamber. The key components are: shell, fan motor, fan impeller, air gun and fire pipe, damper controller, damper baffle, cam adjusting mechanism and dispersion plate.
2. Combustion system: the effect of combustion system lies in the inclusion of combustion atmosphere and fuel, and its key components include: combustion transformer, combustion electrode, electric fire high-voltage cable.
3. Monitoring system: the function of the monitoring system is to ensure the safe and stable operation of the incinerator. Its key components include flame monitor, pressure monitor, temperature monitor, etc.
4. Fuel system: the function of fuel system is to guarantee the fuel required for incineration of incinerator. The main points are: oil pipe and discussion, oil pump, solenoid valve, nozzle, heavy oil preheater.
5. Electric control system: for the electric control system, the instruction center and the entrapment center of each system, it is important to master that the component is the program controller, and the different incinerators are equipped with different program controllers. The most common program controllers are LFL series, LAL series, loa series and LGB series, and the important difference is the time difference of each French step.
Principle of low nitrogen incinerator
Low NOx incinerator and low NOx incinerator refer to the incinerator with low NOx emission during the fuel incineration process, which can reduce the NOx emission during the incineration process by accepting the low NOx incineration function.
No and NO2 are the most important oxides in the incineration process, which are generally called NOx. According to the results of a large number of tests, no is the most important nitrogen oxide discharged by incineration assembly, accounting for 95% on average, while NO2 only accounts for 5% of the total.
The NO produced by common fuel incineration mainly comes from two aspects: one is the oxidation of nitrogen in the combustion atmosphere (combustion supporting atmosphere); the other is the thermal decomposition and reoxidation of nitrogen compounds in the combustion process. In numerous incineration assemblies, the former is the key source of No. we call such no "thermal feedback no", the latter "fuel no", and the other "instantaneous no".
The NO produced during incineration can be fed back with the products of the nitrogen-containing atomic center to restore no to NO2. In fact, in addition to these feedbacks, no can also produce NO2 with various nitrogen-containing compounds. In the actual incineration assembly, when the feedback reaches the chemical average, the proportion of [NO2] / [no] is very small, that is to say, there is little change from no to NO2, which can be missed.
——Author：ebico