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Petal ammonia injection grid for combining local vortex and overall vortex

An ammonia injection grid and a combined technology, which is applied in the field of petal-shaped ammonia injection grids combining local eddy currents and overall swirls, can solve the problems of difficult application, poor mixing characteristics, and easy clogging of nozzles, and achieve mixing. Good effect, less resistance increase, effect of increasing turbulence intensity

Active Publication Date: 2015-05-27
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ammonia injection grid completely relies on the principle of vortex mixing. In the initial stage of ammonia injection, the mixing characteristics are very poor, and the distance required for uniform mixing is long, requiring a geometric size of L / D=1.5-3, which is in many applications. occasion is not satisfied
[0006] It can be seen that the traditional ammonia injection grid system has the problems of easy blockage of nozzles and complicated adjustment; or it is simple to adjust and not easy to block, but the mixing distance is required to be long, which is usually difficult to achieve in practical applications.

Method used

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  • Petal ammonia injection grid for combining local vortex and overall vortex
  • Petal ammonia injection grid for combining local vortex and overall vortex
  • Petal ammonia injection grid for combining local vortex and overall vortex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, see figure 1 , the present invention includes a main pipe 1 with a flow regulating valve and four branch pipes 2 drawn from the main pipe 1, a nozzle 3 is arranged on each branch pipe 2, and a disc 4 is arranged under each nozzle, and the circle The discs 4 are arranged at 45°~60° to the flow direction of the flue gas, and the included angles between each disc 4 and the flue gas flow are different, and each disc 4 rotates clockwise or counterclockwise in space. And the lower part of the nozzle 3 on the branch pipe 2 is provided with a throat to increase the flow rate of the mixed gas at the outlet of the nozzle 3 .

Embodiment 2

[0023] Example 2, see figure 2 , 6 branch pipes 2 drawn on the main pipe 1 of the present embodiment, other structures are the same as in the embodiment 1.

Embodiment 3

[0024] Example 3, see image 3 , 8 branch pipes 2 drawn on the main pipe 1 of the present embodiment, other structures are the same as in the embodiment 1.

[0025] see Figure 4 , 5. In use, it is usually necessary to arrange multiple sets of figure 1 , the ammonia injection grid shown in 2 or 3, and the ammonia injection grid is arranged in a combination of A×B. Among them, A and B represent the number of ammonia injection grills arranged on two adjacent sides of a rectangular cross section perpendicular to the direction of flue gas flow, and the values ​​of A and B are generally: 2~20. Arrange a valve on the main pipe of each ammonia injection grid to adjust the flow rate of the ammonia / air mixture entering the main pipe of the ammonia injection grid. Throats are arranged in front of the nozzles on each ammonia injection grid branch pipe, so that on the one hand, the local gas flow rate of the ammonia / air mixture out of the nozzles is increased, which can effectively pre...

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Abstract

The invention discloses a petal ammonia injection grid for combining local vortex and overall vortex. The petal ammonia injection grid comprises a primary pipe and 4-8 branch pipes which are led out of the primary pipe, wherein a nozzle is arranged in each branch pipe; a disc is arranged below each nozzle; an included angle of 45-60 degrees is formed between the disc and the flue gas flow direction; the included angle between each disc and the flue gas flow direction is different; and each disc rotates clockwise or anticlockwise in the space. According to each group of petal ammonia injection grid, a local negative pressure area is formed on the back of the disc when the flue gas flows through the disc, and the inflow flue gas rotates on the disc. Due to the action of the local vortex and overall vortex, the mixing of ammonia / air mixed gas and flue gas is greatly promoted, and the distance of uniformly diffusing the ammonia to the flue gas can be effectively shortened. Multiple groups of the ammonia injection grids are arranged in a flue, so that the inflow flue gas flows through each group of ammonia injection grid and then rotates in the same rotating direction or different rotating directions, the turbulence intensity of the flue gas is further improved, and the required distance of uniformly diffusing the ammonia to the flue gas is effectively shortened.

Description

technical field [0001] The invention relates to a key technology in the high-temperature and high-dust flue gas denitrification system of a coal-fired boiler, that is, a device for injecting ammonia gas into the flue gas upstream of the denitrification reactor of the flue gas denitrification system, and specifically relates to a local eddy current and an overall A petal-shaped ammonia-injection grill combined with a swirl. Background technique [0002] Coal-fired boilers are an important means of energy production in my country. With the development of the national economy, energy consumption is increasing year by year, and the accompanying air pollution problem has gradually become prominent and has become the focus of attention. Of which nitrogen oxides (NO X ) is one of the three main air pollutants, which is extremely harmful. Therefore governance NO X Pollution has become an urgent problem to be solved in our country. At present, the flue gas denitrification technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/90
Inventor 牛国平董陈王晓冰张波
Owner XIAN THERMAL POWER RES INST CO LTD