CN2373685Y

CN2373685Y - Inertial gradation vortex coal powder burner

Info

Publication number: CN2373685Y
Application number: CN 99210456
Authority: CN
Inventors: 李争起; 孙锐; 孙绍增; 吴少华; 秦裕琨
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 1999-05-12
Filing date: 1999-05-12
Publication date: 2000-04-12
Anticipated expiration: 2009-05-12

Abstract

The utility model relates to an inertial burner for concentration rotational flow coal powder. The burner is mainly characterized in that a coal powder concentrator is arranged at a position which is arranged at a primary air passage of the existing burner and has a certain distance away from a nozzle of the burner. Primary air powder is in a straight flow type, and then forms a distribution tendency that the concentration of coal powder decreases from a high level to a low level from one side of the center of the burner to the side which is close to secondary air in the primary air passage after the primary air powder passes through the concentrator, and the primary air powder maintains the distribution tendency and is sprayed into a furnace chamber by that the concentrator has a certain distance away from the nozzle of the burner. The utility model simultaneously solves the problems of high efficiency, burning stabilization, low emission of NO x, slagging prevention and corrosion prevention of high temperature of coal powder burning.

Description

The deep or light vortex burner of a kind of inertia

The utility model relates to the deep or light vortex burner of a kind of inertia.

China is rare in the world several energy based on one of country of coal, and power industry is that coal is changeable with the characteristics of coal, and ature of coal is relatively poor.In the coal powder boiler combustion technology, be: high efficiency, steady combustion, lowly pollute, prevent slagging scorification and prevent high temperature corrosion to the basic demand of coal dust firing.For saving the energy, need to guarantee efficient combustion; Because China's coal in power plant ature of coal is relatively poor, coal is changeable, stable combustion problem is outstanding, and particularly when underrun, the throwing oil of usually having to is combustion-supporting, thereby has increased cost of electricity-generating; Along with the raising of living standards of the people, the control of environmental pollution requires more and more higher, and is more and more stronger to the low pollution requirement of coal dust firing; Safety, economy, the stable operation of boiler in the high temperature corrosion serious threat of the slagging scorification of burner region, water screen tube.Though and some coal powder burner of China can be realized varying duty, low NOx combustion, its windbend head bifurcated separator is positioned at combustor external, wind of concentrated phase enters burner hearth through the concentrated phase burner, and wind of dilute phase enters burner hearth, complex structure through the dilute phase primary air nozzle; (account for primary air flow 45～65%) do not enter the concentrated phase burner because the wind of dilute phase in wind, and the excess air coefficient that makes concentrated phase burner air feed is less than 1, thereby influences the efficiency of combustion of coal dust, easily causes the slagging scorification and the high temperature corrosion of concentrated phase burner region.

The purpose of this utility model is the deep or light vortex burner of inertia that proposes a kind of simple in structure, high efficiency that can realize coal dust firing simultaneously, steady combustion, lowly pollutes, prevents slagging scorification and prevent high temperature corrosion at the problem that present technology exists.

The purpose of this utility model is to realize like this, the utility model is logical 5 by burner hearth 1, nozzles 2, inspissator 3, cyclone 4, direct current secondary wind, toroidal membrane 6, swirl secondary air road 7, wind of burner are logical 8, central tube 9, wind pulverized coal feed pipe 10, air door baffle plate 11, secondary air duct 12, an air door baffle plate 13 are formed, and the main points of the invention are: at wind passage of burner apart from burner nozzle a distance installation pulverized coal concentrator.After the coal dust air of sending here from wind pulverized coal feed pipe flows into air channel 8 of burner, evenly distribute to become by original coal powder density and distribute to low through being contained in inspissator 3 backs in wind of burner logical 8 with the form of direct current by height by burner center one side to a side coal powder density near secondary wind, because inspissator 3 has certain distance apart from burner hearth 1, and primary wind and powder is a direct current, make coal dust slower by the low side diffusion of the higher side direction of coal powder density, thereby make primary wind and powder keep a kind of like this and spray into burner hearth 1 to low this distribution trend by nozzles 2 by height by the outside coal powder density in burner center, secondary wind is divided into eddy flow after entering burner by secondary air duct 12, direct current two parts, they pass through swirl secondary air road 7 respectively, direct current secondary wind logical 5 enters burner hearth 1, damper baffle plate 11,13 aperture can change swirl secondary air, the ratio of direct current secondary wind.Breeze airflow coal powder density near the burner center is higher, enters high temperature recirculation zone, and then forms high temperature, area with high mercury, helps coal powder ignition and flame stabilization.Because breeze airflow formed deep or light distribution, secondary wind also has been divided into two strands of eddy flow and direct currents simultaneously, and fuel bias combustion and the burning of secondary air separating level can effectively suppress the formation of NOx, reduce the discharging of NOx.After the breeze airflow of inboard higher coal powder density caught fire, breeze airflow, the secondary wind of the low coal powder density in the outside were in time sneaked into, and have guaranteed the required oxygen that burns, and meet the principle of carrying out air feed with burning, and the primary wind and powder primary air ratio are constant, has guaranteed efficient burning.The novel burner primary wind and powder is a direct current, and coal dust is concentrated to the burner center, thereby has formed stronger oxidizing atmosphere near the burner region water-cooling wall, and fusion point of ash is higher under oxidizing atmosphere, thereby has prevented slagging scorification, prevents to have formed high temperature corrosion.

The utility model solved simultaneously coal dust firing high efficiency, steady combustion, low NOx drainage, prevent slagging scorification and prevent high temperature corrosion that this pollutes to utilize to the distinctive colm of China efficient, low very positive effect.

Fig. 1 is the utility model principle assumption diagram

Embodiment: the inspissator structure can be varied in the utility model, as adopt one or several taper blade to constitute the venetian blind type pulverized coal concentrator, during the uniform breeze airflow process of coal powder density taper blade, because particle and blade collision produce gas solid separation, distribute to low by height thereby form by burner center one side to a side coal powder density near secondary wind.

Claims

1. the deep or light vortex burner of inertia is characterized in that: at wind passage of burner pulverized coal concentrator is installed apart from burner nozzle a distance.