Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Densed-phase back-flushing split-pole NOx combustion

A combustion method and multiple technologies, applied in the field of boilers, can solve the problems such as the lack of oxygen in the water wall of the main combustion area, affecting the intensified combustion of pulverized coal, and increasing the flow deviation of the furnace outlet, so as to eliminate negative problems in the furnace, Conducive to the effect of controlling the generation of NOx and strengthening the reduction effect

Inactive Publication Date: 2007-11-21
SHANGHAI JIAO TONG UNIV
View PDF0 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies all adopt the secondary air deflection combustion method. If the secondary air deflection is not properly set, it cannot effectively solve the oxygen deficiency near the water cooling wall of the main combustion area, and may easily cause: due to the biased secondary air traction, the primary wind shear When the circle is enlarged, the pulverized coal is easier to adhere to the wall; the rotational momentum in the furnace is enhanced, and the flow deviation at the furnace outlet is increased
The low oxygen concentration in the main combustion area of ​​the overall air classification in the furnace also affects the enhanced ignition and combustion of pulverized coal in the early stage, which is unfavorable for NOx control
Although the setting of the NOx reduction zone of the overall air classification in the furnace plays a vital role in the final effect of NOx emission control in the furnace, the reduction zone is relatively separated from the burnout zone, and the later burnout degree of pulverized coal will be affected

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Densed-phase back-flushing split-pole NOx combustion
  • Densed-phase back-flushing split-pole NOx combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0015] As shown in FIG. 1 , the principle diagram of the dense phase large reverse blowing multi-stage NOx combustion system of this embodiment includes a main burner group, an overburning air nozzle group, and a reducing air nozzle group. The main burner group is composed of multiple layers of primary and secondary air nozzles alternately. The layout of the secondary air nozzles is the same as that of the usual four-corner tangential combustion system. The pulverized coal burner is used to divide the primary air into two streams of thick and thin in the horizontal dir...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A concentrated opposite blowing multiple classification NOx combustion method of the protection environmental technology area. The invention is that along the furnace height direction fall into the main combustion chamber, reducing area and burnout area, in the main area the wind fall into two shades in a level direction by firebox , a strong wind rip into the furnace burning side, after the promotion is reversed to change, and the secondary wind cut into the furnace, joint with light wind and form rotary stability aerodynamic field, so most of the wind pulverized coal is led to the furnace central region, ultimately in the heater form a light wind wrap a strong wind, a second air parcels light wind, and wind wrap powder situation, a second wind and light wind in the near wall region of water wall form oxidizing atmosphere, away from water wall region the pulverized coal burning. The invention achieves ultra-low NOx emission, while the burning area prevents to slag and ensure the high combustion efficiency etc. characteristics.

Description

technical field [0001] The invention relates to a method in the technical field of boilers, in particular to a method for burning dense and reverse-blown multiple staged NOx. Background technique [0002] At present, my country's power energy is mainly coal-fired thermal power generation, and the combustion of coal will produce a large amount of nitrogen oxides, such as NO and N 2 O, these two substances are generally referred to as NOx. NOx damages the environment, causing acid rain and photochemical smog. At present, technologies for controlling NOx emissions are divided into two categories: controlling the generation of NOx during the combustion process in the boiler furnace and flue gas purification technology, although flue gas purification technology can greatly reduce NOx emissions to 200mg / m 3 Below, but there are problems such as expensive equipment and high operating costs. Although the general low-NOx combustion technology has the advantages of simple implement...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F23C7/02F23L9/00
Inventor 范卫东章明川陆杰
Owner SHANGHAI JIAO TONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products