Countermeasures To The Problems After The Retrofit Of Low NOx Burner Of Boiler
Countermeasures To The Problems After The Retrofit Of Low NOx Burner Of Boiler
The problems that occurred in the application of the low nitrogen burner of the boiler in the thermal power plant are gradually exposed. The following countermeasures are recommended for the problems:
1、 Adequate pre-modification evaluation
The emission indexes of the boiler, especially the emission concentration of no, are closely related to the coal type, boiler selection, and burner type. The boiler type in operation has been determined. However, in recent years, most of the coal-fired boiler of the coal-fired power plant is mixed and has poor performance. Therefore, before the transformation with low nitrogen combustion technology, the first is to comprehensively evaluate the existing main combustion coal and common coal of the boiler. During the transformation feasibility demonstration, Due to improper coal preparation, no emission reduction effect after transformation is not obvious, and many new problems are generated. Then, carry out the bottom test on the coal handling furnace, fully evaluate the existing problems in combustion performance, steam parameters, heating surface wall temperature, coking and slagging, operation regulation, thermal automation, etc., and put forward scientific and reasonable transformation objectives, weigh the economic indicators and environmental protection indicators of the boiler, gradually solve the existing problems and eliminate the generation of new problems.
2、 Optimize and adjust and adopt scientific combustion methods
After the transformation of the low nitrogen burner of the boiler, the burner type has been determined. However, under different working conditions, the amount of no produced by burning different coals is different. It can be seen that the boiler operation mode plays a leading role. Therefore, in order to reduce the emission of no, it is necessary to optimize the combustion mode. On the premise of meeting the environmental protection emission, the operating economy should be considered to the maximum extent.
1. The boiler is mixed with coal in layers
When the concentration of exhaust gas meets the environmental protection requirements and the combustion is stable, the most economical coal shall be used for stratified combustion in the furnace, which can not only ensure the stability of the boiler but also control the generation of No.
2. Optimization of thermal automatic control
After the transformation of low nitrogen technology, the combustion time of the boiler has been prolonged. The thermal control system and control curve should be optimized and adjusted. In view of the problems encountered in the actual work of the boiler, the required control curve and control system should be optimized to improve its response ability under load.
3. Continuous combustion optimization adjustment
After the transformation of the low nitrogen combustion technology of the boiler, in addition to the type of coal to be fired, it is mainly necessary to optimize the operation mode of the boiler, the oxygen content of the boiler, the air distribution mode, the operation combination mode of the coal mill and other coal types and load changes. After the optimization and adjustment test of the boiler combustion, the coal quality has changed greatly, and it usually needs to be adjusted for nearly two months, Only in this way can we find out the law of giving consideration to the environmental protection emission index and the operation economic index. Therefore, it is very important to optimize and adjust the continuous combustion.
The transformation of the low nitrogen burner of the boiler takes a short time, with incomplete exposure, insufficient understanding, insufficient experience in solving problems, and insufficient experience in solving problems. In order to reduce the environmental pressure of the thermal power plant, the no-reduction technology needs to be further researched and developed to reduce the environmental pressure of the power plant. More importantly, the problem-solving capacity generated after the application of the new emission reduction technology and environmental protection facilities should be further improved, Strive to make the sustainable development of coal-fired power plants strive for greater environmental benefits.