Flue-gas swirl strong mixing split filter board

A filter plate and vortex technology, applied in the field of flue gas vortex strong mixing split filter plate, can solve the problems of increasing the volume of the SCR device, inconvenient design, installation and operation, reducing escape and air leakage, convenient installation and operation. The effect of running, reducing the size

Inactive Publication Date: 2009-04-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even so, ammonia and flue gas cannot meet the mixing requirements at the ammonia injection grid, and a static mixer is still required downstream, making the length of the mixing section very long, and the distance between the economizer and the air

Method used

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  • Flue-gas swirl strong mixing split filter board
  • Flue-gas swirl strong mixing split filter board
  • Flue-gas swirl strong mixing split filter board

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] Embodiment of the present invention is described as follows in conjunction with accompanying drawing:

[0022] A number of ammonia injection pipes 2 of ammonia injection grids are arranged on the cross section of the flue 1, and two vortex strong mixing and split flow filter plates 4 are arranged on each ammonia injection pipe. The structure of the filter plate 4 is an angle steel with small holes of different apertures, and the length is equal to the length of the nozzle or slightly longer. Near the ammonia gas outlet, that is, the pore size at the root of the filter plate is small and the number is small; the pore size near the edge of the filter plate is large and the number is large. The edge of the filter plate is semicircular and serrated. The filter plate 4 is installed on the ammonia injection grid pipe, close to the ammonia gas nozzle, and forms an included angle of 40° to 60° with the direction of the flue gas. The upper and lower filter plates are symmetric...

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PUM

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Abstract

A flue gas swirl strong mixing diversion filter board is used in a power station pulverized coal fired boiler at a grizzly screen for spraying ammonia of a flue gas selective catalyctic reduction (SCR) denitration device; the swirl strong mixing diversion filter board (4) are arranged along the outer surface of a metallic conduit (2) of the grizzly screen for spraying ammonia and is divided into an upper board and a lower board, the lengths of which are equal to or slightly longer than that of a spray pipe; the swirl strong mixing diversion filter board (4) installed on the metallic conduit (2) of the grizzly screen for spraying ammonia is close to an ammonia gas jet orifice (3) and forms the angle of 40-60 degrees, and the upper board and the lower board of the swirl strong mixing diversion filter board (4) are symmetrical and connected and supported with each other by a filter board support (5). The ammonia gas is gradually mixed with the flue gas in the process of flowing along the filter board (4) and gradually flows into flue gas flow field at rear along a round hole to be diverted by the round hole. The mixture of the ammonia gas and the flue gas form a great deal of swirl under the action of an ostiole of the filter board and the sawtooth edge of the filter board, and is rapidly mixed in the flow.

Description

technical field [0001] The invention relates to a flue gas vortex strong mixing shunt filter plate used in a flue gas selective catalytic reduction (SCR) denitrification device used in a pulverized coal boiler of a power station, and belongs to the technical field of environmental protection equipment. Background technique [0002] Selective catalytic reduction (SCR) is mainly used to remove NOx in flue gas. At present, SCR technology has been widely used in various industrial devices such as power plant boilers and gas turbines due to its stable performance and good removal efficiency. At present, the most commonly used arrangement method of SCR is high-dust arrangement, that is, it is arranged after the economizer and before the air preheater. The main principle is to use liquid ammonia or ammonia water as a reducing agent, mix it with air and spray it into the flue upstream of the SCR reactor, and react with NOx in the flue gas under the action of a catalyst to generate ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56
Inventor 程星星金保升
Owner SOUTHEAST UNIV
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