Low nitrogen burner refers to the burner in the design of low nitrogen combustion technology, so that the air and fuel in a certain way of classification, mixed combustion, fuel combustion process NOx emissions are low. Using a low NOx burner can reduce NOx emissions during combustion. There are many factors affecting NOx generation, the main factors are combustion temperature, fuel concentration, oxygen concentration, shorten the residence time of flue gas in the high temperature zone. The essence of low NOx combustion technology is to reduce the maximum combustion temperature and control the concentration of fuel or oxygen in the combustion zone to destroy the optimal conditions for NOx generation to reduce the production of NO. For gas-fired boilers, it is important to control the temperature and time of the combustion process to reduce nox production.
Is to extract part of the lower temperature of the flue gas and combustion air mixed, through the burner into the furnace, so as to reduce the combustion temperature and oxygen concentration, effectively reduce NOx production of a combustion technology. Flue gas recirculation control method of a flue gas recycling recycling of smoke gas through import frequency conversion fan control panel to adjust, PLC by signal control damper, by recycling the smoke gas and combustion load setting optimal combustion curve, automatic control, according to automatically adjust the flue gas under different working conditions, management operation of scrap, to meet the boiler NOx concentration control under different load in a reasonable range. Flue gas recirculation rate of gas-fired boilers is generally controlled at 10-20%.
Due to the replacement of the burner and the addition of recirculation fan, flue duct and flue gas/air mixer, higher requirements are put forward for the environment of the boiler room. It is necessary to regularly check the gas leakage detection probe and carry out the leakage alarm linkage test to ensure that the monitoring of the probe is accurate and the ventilation system linkage is reliable. In the process of operation, it is necessary to strengthen the inspection of equipment, flue, air duct and adjusting baffle, so as to avoid the phenomenon that the baffle switch is not flexible and the action is not accurate; Regularly replace or change the filter element and other components; Regularly check the drainage situation at the inlet, flue and air duct drainage points of the blower to avoid vibration or corrosion of the smoke duct; Regularly check and maintain boiler flue gas emission monitoring system to ensure the accuracy and reliability of test data. The operation analysis of boiler outlet pressure, water supply temperature, smoke temperature at furnace outlet, oxygen content, smoke exhaust temperature and main operation parameters of the transition is carried out. The abnormal situation is reported and measures are taken to ensure the safe operation of the boiler. After stopping the boiler, the anti-wear, anti-corrosion and water accumulation of the heating surface, burner, smoke duct and other parts should be inspected.
When the boiler is running under low load, the nox emission concentration cannot reach below 30mg/Nm3; Incorrect setting time of FGR will result in shutout, which is extremely difficult for on-site staff to operate, and it is not easy to find the optimal ratio of recirculating smoke and air volume, resulting in difficulties in debugging. At the same time the flue gas and the cold air contact mix to produce more condensed water. The boiler flue gas flow increases, the flue gas flow field changes greatly, and the possibility of boiler flue vibration exists. For the transformation of the boiler, whether using low nitrogen burners or flue gas recirculation technology or combination technology, is to reduce the furnace combustion temperature, resulting in the reduction of radiation heat transfer, flue gas flow in the tail increased, convection heat transfer increased, the overall efficiency of the boiler has the possibility of reducing.
How a bowl of Baixiang good noodles is born? About 1.8 million years ago, humans learned to cook food with purposeful control of fire. The use of fire has made unprecedented progress in human health and life, and Darwin also called cooking the most important invention of mankind after language....
Heat delivers real deliciousness. In recent years, China's kimchi industry has grown rapidly, with a market size of more than 40 billion. With the gradual rise of the "stay-at-home economy", Chinese compound condiments and prepared dishes have become new trends in the industry....
