Ammonia spraying grille device for realizing automatic regulation, simultaneously reinforcing mixing and preventing blockage and ammonia spraying method thereof

Abstract

The invention relates to an ammonia spraying grille device for realizing automatic regulation, simultaneously reinforcing the mixing and preventing blockage and an ammonia spraying method thereof, andbelongs to the field of coal-fired boiler environment protection. The existing ammonia spraying grille has the defects that the mixing effect of ammonia gas and smoke gas is poor; the regulation workload is great; the blockage is easy. A smoke gas flow speed tracking device is connected with a No.1 lever; the No.1 lever is connected with an ammonia spraying support pipe; a No.2 lever is connectedwith the No.1 lever and is also connected with a connecting rod; the connecting rod is positioned inside a spray nozzle and sequentially penetrates through a spray nozzle open degree regulating valveand an elastic component to be connected with a support ring; the spray nozzle open degree regulating valve is positioned on the spray nozzle; the elastic component is positioned in the spray nozzle;one end of the elastic component is adjacent to the spray nozzle open degree regulating valve and is fixed with the inner wall of the spray nozzle; the other end of the elastic component is fixed with the support ring; a guide ring is arranged on the outer wall of the spray nozzle; the No.2 lever penetrates through the guide ring; the spray nozzle is communicated with the ammonia spraying branchpipe. The goal of automatically regulating the open degree of each spray nozzle according to the smoke gas flow rate can be achieved by using simple mechanical principles.

Description

technical field [0001] The invention relates to an ammonia injection grid device and an ammonia injection method which can automatically adjust and simultaneously strengthen mixing and anti-blocking, and belongs to the field of environmental protection of coal-fired boilers. Background technique [0002] Coal produces a large amount of harmful substances during the combustion process, and the NOx pollution problem caused by coal combustion in the thermal power generation industry has attracted widespread attention from all walks of life. In order to fully realize the ultra-low emission transformation of coal-fired units, it poses severe challenges to the stable and efficient operation of denitrification devices. The operation of the ammonia injection grid is directly related to the NOx removal efficiency of the denitrification system, the ammonia slip rate, the life of the catalyst and the clogging of the air preheater. [0003] There are some disadvantages and deficiencies...

AI Technical Summary

Problems solved by technology

[0003] There are some disadvantages and deficiencies in the traditional ammonia injection grid: the traditional ammonia injection grid adopts a linear arrangement or a partition arrangement, and the injection volume restored in the same line or in the same area is the same, such as the Chinese patent application number 201710070946.9, but The distribution of the flow field in the flue is uneven, and the flue gas flow rate at each injection point is not the same or even changes in real time. Faced with this situation, the mixing effect of ammonia gas and flue gas is poor regardless of whether the ammonia injection grid is arranged linearly or in partitions.

The adjustment workload of the traditional ammonia injection grill is relatively large, and the ammonia injection grill usually does not change with the change of the load and the flow field in the flue after adjustment, but the flow field in the flue is complicated, almost every second All are changing, so the traditional ammonia injection grill has poor adaptability to changes in flue gas conditions, which leads to low operating efficiency of the system

In addition, part of the nozzle openings in the ammonia injection grille are upward, which is easy to be blocked by flue collapse or low-load settlement ash

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