Under the requirement of environmental protection policy, industry now also attaches great importance to energy saving and emission reduction measures. Low-NOx combustion technology has certain advantages in environmental protection, but at the same time, it also has certain influence on the operation of boilers, so it is necessary to further strengthen the measures to deal with the problems occurring in new environmental protection technology, and to strive for the maximum environmental protection mechanism for sustainable industrial development. This paper discusses the relevant content, which has certain practical significance.
(1) the impact of combustion stability, the stability of the boiler is reflected in many aspects, its most important manifestation is in the stability of the temperature and the stability of the operation process. Low nitrogen burner in the primary jet port set thick and light combination, the use of thermal reflux relay combustion and other technologies, in the combustion process according to the asymmetric principle of heat and power design, pyrolysis jet port of coal powder and the boiler center of the composite jet vortex connection, high reflux rate of hot reflux toner to extend the residence time, improve the heat generated by combustion within the vortex, boiler low nitrogen transformation and the number of oxygen control, in the combustion process Oxygen is needed to meet the combustion conditions to generate heat, and as the oxygen number is controlled the heat generation is inhibited, thus affecting the operation of the boiler. These two operating methods have an impact on the stable operation of the boiler.
(2) The internal environment of the boiler has less influence on the low-NOx burner nozzle than the conventional burner, so the flame produced by the fuel moves. The reduction in combustion area reduces the boiler's reception of temperature, while the pressure state generated inside the boiler changes, leading to incongruity. The modification of the low-NOx burner equipment changes the boiler components and the operation is different. The modification of the low-NOx burner affects the oxygen quantity inside the boiler to a certain extent. Usually there is a maximum operating oxygen quantity and a minimum operating oxygen quantity, and the adjustment of the unit cannot keep up with the adjustment of the oxygen quantity and produces negative oxygen. The change of the oxygen quantity and the change of the combustion degree change the pressure inside and outside the boiler and change the internal environment, and the personnel concerned need to adjust the oxygen quantity and carry out the air supply operation directly.
(3) The boiler reheating temperature is affected, and the original burner elevation is lowered after the low-NOx burner transformation, which has a greater impact on the reheating temperature. After the burner transformation, the unit coordination is slow, and the boiler pressure tracking adjustment cannot keep up, so it is easy to have overshoot and temperature change. The modified low-NOx burner has a set of swinging nozzles, when the nozzle swings up the steam temperature will rise, the temperature will drop when the nozzle swings down, but because there is only one set of swinging nozzles so the speed of temperature adjustment is limited, the adjustment time is too long plus the wind sub-ratio is controlled by the low oxygen conditions, affecting the efficiency of the machine. In order to ensure that the boiler outlet temperature is within the low load range, a powder manufacturing system must be used, which will lead to high temperatures on the heating surface, making it difficult to overtemperature. At the same time, the outlet temperature should be controlled within a certain range, which affects the normal operation of the boiler.
(4) the impact on the coking of the furnace chamber, low nitrogen burner in the use of the process, although the burner in the operation process will appear coking phenomenon, especially when starting the lower powder making system, will have an impact on the coking of the furnace chamber, but in the operation process, the burner nozzle is still coking phenomenon, especially when starting the lower powder making system, it will obviously affect the negative pressure, indicating that the combustion zone condition is not good, because the main combustion zone for oxygen deficiency combustion, so the cold wall coking phenomenon will appear near the burner, especially when starting the lower powder making system, which will obviously affect the boiler combustion condition, indicating that the combustion zone condition is not good because the main combustion zone carries out oxygen deficiency and oxygen deprivation, so the cold wall coking phenomenon will appear near the burner, which has an impact on the furnace coking.
(5) The low nitrogen burner increases the combustibility of the slag while reducing the NO yield. Low nitrogen combustion technology uses low temperature and low oxygen conditions for combustion, the more the temperature in the combustion zone drops, the greater the impact of pulverized coal ignition, the oxygen in the combustion zone drops, the combustion capacity of pulverized coal decreases, the combustion process also increases, the combustibility of slag increases, the burner nozzle area changes, the mixing wind is delayed, and the pulverized coal airflow in the boiler.
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