Unlock instant, AI-driven research and patent intelligence for your innovation.

Dual-mode pulverized coal burner and boiler burner system

A pulverized coal burner and boiler combustion technology, which is applied in the direction of burners, burners burning powder fuel, and burning with various fuels. Ease of implementation, low generation effect

Inactive Publication Date: 2016-07-20
HUAZHONG UNIV OF SCI & TECH
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method can greatly reduce the generation of NOx in theory, but in actual boiler design and operation (especially boilers with tertiary air), due to the high proportion of tertiary air, which accounts for about 20% of the total air volume, when the pulverizing system During operation, the high-level tertiary air must be operated, and it is difficult to form an oxygen-lean reduction zone between the main combustion zone and the burnout zone, and it is difficult to reduce nitrogen oxides, so that real staged combustion cannot be realized, resulting in the formation of a considerable amount of NOx
Therefore, the above method is not ideal for suppressing nitrogen oxides in actual operation.

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
  • Dual-mode pulverized coal burner and boiler burner system
  • Dual-mode pulverized coal burner and boiler burner system
  • Dual-mode pulverized coal burner and boiler burner system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The double-mode pulverized coal burner provided in this embodiment has a total length of 2160mm, wherein the tertiary air duct 2 is 1500mm long, and the height inside the duct is 350mm, made of wear-resistant and high-temperature resistant alloy steel, which is shared with the secondary air duct The outlet channel 3 is long 200mm, and the outlet channel 3 is a pipe with a minimum end height of 474mm and a maximum end height of 550mm and a truss structure (seeing A and B direction views), and the material is also wear-resistant and high-temperature resistant alloy steel. Due to the high concentration of the upper part of the pulverized coal flow through the diversion block, the wear on the inner wall is also more serious. Therefore, the wall thickness of the upper part of the tertiary air duct is slightly thicker than that of the lower part. The thickness of the upper part of the tertiary air duct is 18mm, and the wall thickness of the rest of the burner is 12mm.

[0044...

Embodiment 2

[0047] Such as Figure 5 Shown is a specific application example of the boiler burner system, which is composed of a primary air burner 8 , a secondary air port 9 , a dual-mode pulverized coal burner 10 , and an overfire air port 11 .

[0048] The design principle of the example is: using dual-mode burners, in a limited space, the combined design of the secondary air and tertiary air outlets is realized, and the dual functions of the same space are realized. Cooperating with ordinary primary, secondary air, and overburning air, the low-nitrogen design concept of uniform oxygen-poor air distribution in the main combustion zone is realized, and the oxygen-poor air caused by the local excessive air volume caused by the high-level arrangement of the tertiary air is avoided. The problem that the zone disappears and it is impossible to maintain the reducing zone to reduce the atmosphere of nitrogen oxides.

[0049] Example The operating principle of the boiler burner system is: whe...

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

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Angleaaaaaaaaaa
Login to View More

Abstract

The invention discloses a dual-mode pulverized coal burner and a boiler burner system. The dual-mode pulverized coal burner comprises a secondary air pipeline and a tertiary air pipeline. The tertiary air pipeline is located in the secondary air pipeline and shares an outlet passageway with the secondary air pipeline. A special-shaped body is arranged at an outlet of the outlet passageway so that a burning reflux area can be formed at an outlet of the burner and pulverized coal can be rapidly heated and burnt. An independent air door is arranged in the secondary air pipeline. An independent air door is arranged in the tertiary air pipeline. Independent running or mixed running of secondary air and tertiary air is achieved through control of the air doors, and dual-mode running of the burner is achieved in this way. The boiler burner system comprises the dual-mode pulverized coal burner arranged between primary air on any two layers of the lower middle area of a boiler main burning area or below primary air on the lowest layer. The dual-mode pulverized coal burner and the boiler burner system are beneficial to ignition and stable burning of the pulverized coal, and have the beneficial effects that the burning efficiency of the pulverized coal is improved and generation and emission of nitrogen oxides are reduced, and efficient, stable and low-nitrogen burning of the pulverized coal can be achieved.

Description

technical field [0001] The invention belongs to the direction of a coal-fired boiler burner in the field of energy and environmental protection, and more specifically relates to a dual-mode pulverized coal burner and a boiler burner system. Background technique [0002] Nitrogen oxides (mainly including NO, NO 2 , N 2 O, N 2 o 3 , N 2 o 4 and N 2 o 5 etc., collectively referred to as NOx) are extremely harmful to the environment on which human beings depend and human beings themselves. On the one hand, NOx is the main factor for the formation of acid rain; on the other hand, under certain conditions, NOx can form photochemical smog with hydrocarbons to damage the atmospheric environment, seriously endanger human health, and deteriorate the environment on which human beings depend for survival. [0003] The flue gas emitted by coal-fired power plants is one of the main sources of NOx emissions. The NOx generated by coal combustion is mainly fuel-type NOx generated by ...

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): F23D1/00F23C5/08
CPCF23D1/00F23C5/08F23D2201/00
Inventor 向军董榛子覃国宇陈元静苏胜汪一胡松熊哲
Owner HUAZHONG UNIV OF SCI & TECH