CN2735175Y

CN2735175Y - Multiphase cofiring low nitrogen oxide combustor

Info

Publication number: CN2735175Y
Application number: CN 200420107538
Authority: CN
Inventors: 朱基木; 安恩科
Original assignee: Tongji University; Baoshan Iron and Steel Co Ltd
Current assignee: Tongji University; Baoshan Iron and Steel Co Ltd
Priority date: 2004-10-29
Filing date: 2004-10-29
Publication date: 2005-10-19
Anticipated expiration: 2014-10-29

Abstract

The utility model relates to the technique of a power boiler coal powder firing, in particular to a multiphase cofiring low nitrogen oxide combustor. The multiphase cofiring low nitrogen oxide combustor comprises a primary air powder air spout and a perimeter air tuyere on the periphery of the primary air powder air spout. The multiphase cofiring low nitrogen oxide combustor is characterized in that the center of the primary air powder air spout is provided with a gas combustor which passes through a primary air powder duct and is connected with a gas duct. The utility model can greatly reduce nitrogen oxide maximal creating concentration in the firing area, and can reduce the discharging of the nitrogen oxide of a power boiler. The multiphase cofiring low nitrogen oxide combustor has simple structure and good effect of reducing nitrogen oxide.

Description

Heterogeneous cofiring low Nox burner

(1) technical field

The utility model relates to the power boiler pulverized coal combustion, relates in particular to heterogeneous cofiring low Nox burner.

(2) background technology

The existing conventional straight-through pulverized coal burner is that primary air carries coal dust jet straight line and sprays into the boiler furnace internal combustion, the structure of burner is referring to Fig. 1, the nozzle of burner has rectangle and circular two kinds of structures, and one time the wind nozzle is provided with surrounding air, referring to Fig. 2, Fig. 3.Pulverized-coal fired boiler is owing to the nitrogenous element of coal dust, and burning produces a large amount of nitrogen oxides, thereby causes the pollution to environment.It is natural gas or fine breeze combustion technology again that the current driving force boiler reduces one of measure of nitrogen oxides emission, this technology belongs to fuel staging, when using the fuel staging technology, with combustion gas or fine breeze arrangement of nozzles in top, sets of burners zone, by the reduction reduction nitrogen oxides emission of CH to nitrogen oxide, but the tubulence energy of sets of burners upper area has reduced about 80% than burner region, be that combustion gas or fine breeze are all very poor with mixing of flue gas, and the nitric oxide concentration of combustion zone reduces greatly than the maximum nitric oxide concentration of burner region again, thus the gas reburning burning technology to reduce the effect of nitrogen oxide undesirable.

(3) summary of the invention

The purpose of this utility model is to provide a kind of heterogeneous cofiring low Nox burner, and it has overcome prior art and has reduced the unfavorable defective of nitrogen oxide effect.Heterogeneous cofiring low Nox burner is organized the burning of combustion gas and coal dust cascode stream, reduces the generation concentration of maximum nitrogen oxide in the stove significantly by the oxygen concentration that reduces volatility nitrogen oxide conversion zone, and burner structure is simple, and is effective.

The utility model is achieved in that a kind of heterogeneous cofiring low Nox burner, comprise the primary wind and powder nozzle and in the circumference air port of primary wind and powder nozzle periphery, it is characterized in that primary wind and powder nozzle central authorities are provided with gas burner, gas burner passes the primary wind and powder pipeline and is connected with gas pipeline.

The heterogeneous cofiring low Nox burner of the utility model adopts combustion gas and the burning of coal dust cascode stream, reduce the generation concentration of maximum nitrogen oxide in the stove significantly by the oxygen concentration that reduces volatility nitrogen oxide conversion zone, and utilized the characteristics of the highest and tubulence energy maximum of power boiler burner hearth inner burner zone nitric oxide concentration, reduce the unfavorable defective of nitrogen oxide effect thereby overcome prior art.The nitrogen oxide that heterogeneous cofiring low Nox burner can reduce power boiler significantly generates concentration, reduces the discharging of nitrogen oxide.Combustion gas coal dust cofiring burns and will improve the suitability of fuel of burner greatly in addition, and the flame holding of burner, improves boiler efficiency and economy.The combustion gas share of this burner is about 10%, and is simple in structure, and it is effective to reduce nitrogen oxide.

(4) description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the burners in prior structural representation;

Fig. 2 is that rectangular A is to view for burner nozzle among Fig. 1;

Fig. 3 be among Fig. 1 burner nozzle for circular A to view;

Fig. 4 is the heterogeneous cofiring low Nox burner of a utility model structural representation;

Fig. 5 is that rectangular A is to view for burner nozzle among Fig. 4;

Fig. 6 be among Fig. 4 burner nozzle for circular A to view.

Among the figure: 1-wind powder nozzle, 2-wind powder pipe road, 3 circumference air ports, 4 gas burners.

(5) specific embodiment

Referring to Fig. 4, Fig. 5, Fig. 6, a kind of heterogeneous cofiring low Nox burner, comprise primary wind and powder nozzle 1 and in the circumference air port 3 of primary wind and powder nozzle 1 periphery, primary wind and powder nozzle 1 central authorities are provided with gas burner 4, gas burner 4 passes primary wind and powder pipeline 2 and connects gas pipelines.This heterogeneous cofiring low Nox burner only needs to increase gas burner 4 in burners in prior, the nitrogen oxide of such combustion gas and coal dust cascode stream burning can the reduction significantly power boiler generates concentration, reduce the discharging of nitrogen oxide, and flame holding raising, the thermal efficiency of burner are increased.Combustion gas and coal dust cofiring burn will improve the suitability of fuel of burner greatly, and this coal resource to China's abundant is used very big benefit.

Claims

1. a heterogeneous cofiring low Nox burner comprises the primary wind and powder nozzle and in the circumference air port of primary wind and powder nozzle periphery, it is characterized in that primary wind and powder nozzle central authorities are provided with gas burner, and gas burner passes the primary wind and powder pipeline and is connected with gas pipeline.