CN-121993793-A - SiO-added2Hydrogen micro-mixing low-nitrogen burner with particle reinforced radiation heat dissipation

CN121993793ACN 121993793 ACN121993793 ACN 121993793ACN-121993793-A

Abstract

The invention discloses a hydrogen micro-mixing low-nitrogen burner with SiO 2 particles added for strengthening radiation heat dissipation, which belongs to the technical field of industrial boiler gas combustion and comprises a protective shell, a micro-mixing combustion unit, a SiO 2 particle conveying unit and a central on-duty diffusion combustion unit, wherein the protective shell comprises an upper shell, a middle shell and a lower shell, the upper shell is arranged on the middle shell, the middle shell is arranged on the lower shell, the micro-mixing combustion unit is radially and uniformly arranged on the protective shell in a penetrating manner, the central on-duty diffusion combustion unit is arranged in the center of the protective shell in a penetrating manner, the SiO 2 particle conveying unit is radially and uniformly arranged on the protective shell in a penetrating manner, and the SiO 2 particle conveying unit is arranged between the micro-mixing combustion unit and the central on-duty diffusion combustion unit. The invention adopts the hydrogen micro-mixing low-nitrogen burner with the SiO 2 added particles for strengthening radiation heat dissipation, and solves the problems of high NO x emission, poor flame stability and easy occurrence of tempering in the prior art.

Inventors

WANG ZHIHUA
GUO YILIN
HE YONG
WENG WUBIN
WANG SHIXING
LIU SIYU
ZHU YANQUN

Assignees

浙江大学

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (8)

1. The hydrogen micro-mixing low-nitrogen burner with the SiO 2 particles added for enhancing radiation heat dissipation is characterized by comprising a protective shell, a micro-mixed combustion unit, a SiO 2 particle conveying unit and a central on-duty diffusion combustion unit, wherein the protective shell comprises an upper shell, a middle shell and a lower shell, the upper shell is arranged on the middle shell, and the middle shell is arranged on the lower shell; The micro-mixed combustion unit is radially and uniformly arranged on the protective shell in a penetrating mode, the central on-duty diffusion combustion unit is arranged in the center of the protective shell in a penetrating mode, the SiO 2 particle conveying unit is radially and uniformly arranged on the protective shell in a penetrating mode, and the SiO 2 particle conveying unit is arranged between the micro-mixed combustion unit and the central on-duty diffusion combustion unit.
2. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation is characterized in that the micro-mixing combustion unit comprises an independent gas cylinder, an independent air cylinder and an air cooling sleeve, wherein the bottom of the independent gas cylinder is arranged on the inner surface of the bottom of the lower shell, the top of the independent gas cylinder is connected with the top of the lower shell through a lower honeycomb fixing disc, a second through hole is formed in the lower honeycomb fixing disc, a uniform pore plate is arranged in the independent gas cylinder, a first through hole is formed in the uniform pore plate, and a gas inlet is formed in the bottom of the independent gas cylinder.
3. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation is characterized in that the independent air cylinder is arranged on the upper surface of a lower honeycomb fixed disc in the middle shell, the top of the independent air cylinder is connected with the top of the middle shell through an upper honeycomb fixed disc, and a third through hole and an air disc through hole are formed in the upper honeycomb fixed disc.
4. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation according to claim 3 is characterized in that a fuel micro-mixing spray pipe is arranged in the independent air cylinder, premixing micropores are uniformly formed in the top of the fuel micro-mixing spray pipe in the radial direction, and the bottom of the fuel micro-mixing spray pipe is fixedly arranged on a second through hole of the lower honeycomb fixing disc.
5. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation according to claim 4, wherein the air cooling sleeve is arranged on the upper surface of an upper honeycomb fixed disc in the upper shell, a fourth through hole is formed in the top of the air cooling sleeve, air side wall perforations are uniformly formed in the side surface of the air cooling sleeve, a plurality of micro-mixing spray pipes are sleeved in the fourth through hole and the third through hole, and the fuel micro-mixing spray pipes are sleeved in the plurality of micro-mixing spray pipes.
6. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation is characterized by further comprising an air inlet tube, wherein the air inlet tube penetrates through the middle shell and is connected with the outer surface of the independent air tube, a branch tube is arranged on the air inlet tube, and the air inlet tube is communicated with the inner part of the upper shell through the branch tube.
7. The hydrogen micro-mixing low-nitrogen burner with SiO 2 particles added for enhancing radiation heat dissipation according to claim 1, wherein the SiO 2 particle conveying unit comprises an air conveying cylinder and a SiO 2 particle conveying pipe, the air conveying cylinder is arranged on the lower surface of the lower shell, and the SiO 2 particle conveying pipe penetrates through the protective shell and is communicated with the air conveying cylinder.
8. The hydrogen micro-mixing low-nitrogen burner with SiO 2 added for enhancing radiation heat dissipation is characterized in that the central on-duty diffusion combustion unit comprises an on-duty gas through pipe, a central air sleeve and an air cyclone sheet, the central air sleeve is installed in the center of the protective shell in a penetrating mode, the on-duty gas through pipe is sleeved in the central air sleeve, and the on-duty gas through pipe is connected with the central air sleeve through the air cyclone sheet.

Description

SiO 2 particle added hydrogen micro-mixing low-nitrogen burner for strengthening radiation heat dissipation Technical Field The invention relates to the technical field of industrial boiler gas combustion, in particular to a hydrogen micro-mixing low-nitrogen burner with SiO 2 particles added for enhancing radiation heat dissipation. Background The hydrogen is used as a green clean energy source with wide source, zero carbon emission, flexibility and high efficiency, has diversified application forms, can be directly used as terminal fuel, can be used as an energy carrier to participate in energy conversion and storage in multiple fields, is one of important carriers for realizing low carbonization transformation of an energy system, and is beneficial to promoting the fields of electric power, industry, traffic, construction and the like to realize deep decarburization. However, the combustion of pure hydrogen has the problems of easy tempering and higher NO x emission, and the inherent combustion instability phenomenon of H 2 under lean combustion conditions restricts the large-scale development of hydrogen fuel. With the increasing environmental awareness of carbon emission reduction, hydrogen has greatly attracted interest as an alternative fuel for industrial boilers. However, the non-luminous flame of hydrogen is different from the bright flame of hydrocarbon fuel such as natural gas, and carbon black particles cannot be generated in the combustion process of pure hydrogen, so that the radiation characteristic of the flame is weaker, the flame temperature is higher, and the emission of NO x is difficult to inhibit. In recent years, in the aspect of development of hydrogen combustion technology, the micro-mixed combustion technology effectively inhibits tempering of hydrogen and uniformly distributes heat load through a multi-array micro-channel structure, and is one of the most promising hydrogen combustion technologies at present, but the core pain points of weak hydrogen flame radiation, high temperature and high NO x emission cannot be effectively improved. Therefore, by introducing solid particles into the hydrogen micro-mixed burner, the heat dissipation of the flame is enhanced and the flame temperature is reduced by the blackbody radiation effect of the solid particles, so that the NO x emission of the hydrogen flame is greatly reduced, and the safe, efficient and low-emission application of the pure hydrogen fuel is expected to be realized. Disclosure of Invention The invention aims to provide a hydrogen micro-mixing low-nitrogen burner with SiO 2 particles added for enhancing radiation heat dissipation, which solves the problems of high NO x emission, poor flame stability and easy occurrence of tempering in the prior art. In order to achieve the above purpose, the invention provides a hydrogen micro-mixing low-nitrogen burner with SiO 2 particles added for enhancing radiation heat dissipation, which comprises a protective shell, a micro-mixing combustion unit, a SiO 2 particle conveying unit and a central on-duty diffusion combustion unit, wherein the protective shell comprises an upper shell, a middle shell and a lower shell, the upper shell is arranged on the middle shell, and the middle shell is arranged on the lower shell; The micro-mixed combustion unit is radially and uniformly arranged on the protective shell in a penetrating mode, the central on-duty diffusion combustion unit is arranged in the center of the protective shell in a penetrating mode, the SiO 2 particle conveying unit is radially and uniformly arranged on the protective shell in a penetrating mode, and the SiO 2 particle conveying unit is arranged between the micro-mixed combustion unit and the central on-duty diffusion combustion unit. Preferably, the micro-mixed combustion unit is of a multistage radial arrangement structure and comprises an independent gas cylinder, an independent air cylinder and an air cooling sleeve, wherein the bottom of the independent gas cylinder is arranged on the inner surface of the bottom of the lower shell, the top of the independent gas cylinder is connected with the top of the lower shell through a lower honeycomb fixing disc, a second through hole is formed in the lower honeycomb fixing disc, a uniform pore plate is arranged in the independent gas cylinder, a first through hole is formed in the uniform pore plate, and a gas inlet is formed in the bottom of the independent gas cylinder. Preferably, the independent air cylinder is mounted on the upper surface of the lower honeycomb fixed disc in the middle shell, the top of the independent air cylinder is connected with the top of the middle shell through an upper honeycomb fixed disc, a third through hole and an air disc through hole are formed in the upper honeycomb fixed disc, and the third through hole and the air disc through hole are both arranged in the air cooling sleeve. Preferably, the independent air cylinder is internally provid