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Natural gas re-burning nozzle for coal boiler

A technology for coal-fired boilers and natural gas, applied in gas fuel burners, burners, incinerators, etc., can solve the problems of affecting the effect of reducing nitrogen oxides, not fully considering the mixing and diffusion characteristics of natural gas, etc., and achieve the scope of reducing atmosphere. Wide and evenly distributed effect

Inactive Publication Date: 2004-03-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing nozzles are generally circular or square pipes that directly inject a stream of natural gas into the furnace, which does not fully consider the mixing and diffusion characteristics of natural gas, which seriously affects the effect of reducing nitrogen oxides

Method used

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  • Natural gas re-burning nozzle for coal boiler
  • Natural gas re-burning nozzle for coal boiler
  • Natural gas re-burning nozzle for coal boiler

Examples

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Embodiment Construction

[0013] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0014] figure 1 It is a front sectional view of the structure of the natural gas reburning nozzle of the present invention.

[0015] Such as figure 1 As shown, on the semicircle of the nozzle 1, there are many oblique injection holes 2 evenly arranged in layers, and the angle between the axis of each oblique injection hole 2 and the axis of the nozzle is 15° to 75°. A number of axial injection holes 3 are evenly opened on the end cap at the end of 1, and the axes of the axial injection holes 3 are parallel to the axial direction of the nozzle.

[0016] figure 2 It is a side view half-sectional view of the structure of the natural gas reburning nozzle of the present invention.

[0017] Such as figure 2 As shown, a number of axial injection holes 3 are evenly opened on the end cover of the nozzle 1, and the axes thereof are parallel to th...

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Abstract

The present invention relates to a coal-fired boiler natural gas secondary combustion nozzle, and is characterized by that the uniformly-layered arranged oblique-jet holes are cut on the semi-periphery of the jet pipe, and the included angle of the axis of oblique jet hole and axis of jet pipe is 15-75 deg., and on the end cover of the jet pipe the axial jet holes parallel to the axis of jet pipe are uniformly cut. Said invention can completely burn the natural gas, and does not produce fire-retardant carbon black.

Description

Technical field: [0001] The invention relates to a natural gas reburning nozzle of a coal-fired boiler, which is applied to the technology of reburning the natural gas of the coal-fired boiler to reduce the emission of nitrogen oxides (NOx) of the coal-fired boiler. Background technique: [0002] In the existing coal-fired boilers, the pollutants are mainly sulfur oxides, nitrogen oxides and dust. Among the measures to reduce nitrogen oxides, natural gas reburning is an effective method. It is to inject a stream of natural gas into the furnace at a suitable position to reduce the nitrogen oxides produced by burning coal in the furnace to nitrogen. In this way, the degree of mixing of natural gas and flue gas and the state of injection play a crucial role in reducing nitrogen oxides, so the optimal design of natural gas nozzles is very important. The existing nozzles are generally round or square pipes that directly inject a stream of natural gas into the furnace, which doe...

Claims

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Application Information

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IPC IPC(8): B01D53/56F23D14/58F23G7/08F23J7/00
Inventor 罗永浩陆方
Owner SHANGHAI JIAO TONG UNIV
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