Automatically-adjusted vortex mixing and anti-blocking ammonia spraying grille apparatus and application method thereof

Abstract

The invention relates to automatically-adjusted vortex mixing and anti-blocking ammonia spraying grille apparatus and an application method thereof. A traditional ammonia spraying grille has the disadvantages of a poor mixing effect of an ammonia gas and a flue gas, large adjustment workload and easy blockage. In the apparatus provided by the invention, a lever is connected with a rotating shaft,one end of the lever is connected with a flue gas flow rate tracking device, the other end of the lever is hinged with one end of each connecting rod, and the other end of each connecting rod is connected with one spray nozzle opening degree regulating valve; and one end of each elastic member is fixed to one corresponding spray nozzle opening degree regulating valve, and the other end of each elastic member is fixed to the inner wall of one corresponding spray nozzle. A simple mechanical principle is used to make a flue gas flow rate fed back to the spray nozzle opening degree regulating valves to regulate the opening degree, and therefore the purpose of automatically regulating the opening degree of each spray nozzle according to the flue gas flow rates is realized. The apparatus disclosed by the invention has the advantages of automatically controlling an ammonia spraying amount of each spray nozzle according to the flue gas flow rates, strengthening mixing of the ammonia gas and the flue gas through the turbulent flow action and preventing the spray nozzles from being blocked due to ash accumulation, and has low equipment, operation and maintenance costs.

Description

technical field [0001] The invention relates to a self-adjusting vortex mixing and anti-blocking ammonia injection grid device and an application method thereof, belonging to the technical field of exhaust pollutant control of coal-fired boilers. Background technique [0002] The supply pattern of coal as the main energy source in my country will not change for a long time in the future. A large amount of harmful substances are produced during the combustion of coal. The problem of NOx pollution caused by coal combustion in the thermal power The ultra-low emission transformation of coal units poses a serious challenge to the stable and efficient operation of the denitrification device. The efficient operation of the ammonia injection grid is the key point, which is directly related to the NOx removal efficiency of the denitrification system, ammonia slip rate, catalyst life and air pollution. Preheater clogging and other problems. [0003] There are some disadvantages and def...

AI Technical Summary

Problems solved by technology

[0004] (1) The traditional ammonia injection grid adopts a linear arrangement or a partition arrangement, and the injection volume reduced in the same line or area is the same, such as the Chinese patent application number 201710070946.9, and the flow field in the flue is unevenly distributed. The flue gas flow rate at each injection point is different or even changes in real time. In this case, the mixing effect of ammonia gas and flue gas is poor regardless of whether the ammonia injection grid is arranged linearly or in partitions.

[0005] (2) The adjustment workload of traditional ammonia-injection grille is relatively large, and the ammonia-injection grille usually does not change with the change of the load and the flow field in the flue after it is adjusted. However, the flow field in the flue is complicated and almost Changes are taking place every second, so the traditional ammonia injection grill has poor adaptability to changes in flue gas conditions, resulting in low operating efficiency of the system

[0006] (3) The opening of some nozzles is upward, which is easy to be blocked by flue collapse or low-load settlement ash

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