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Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging

A fuel grading and air grading technology, which is applied in the field of W flame boiler combustion and four-arch W flame boiler, can solve the problem that W flame boiler cannot take into account both emission and efficient burnout.

Active Publication Date: 2015-03-11
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the W-flame boiler mentioned in the background technology cannot simultaneously take into account low NOx emission and high-efficiency burnout , and then provides a four-arch low NOx W flame boiler coupled with air staging and fuel staging

Method used

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  • Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging
  • Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging

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Embodiment approach 1

[0015] combine figure 1 Describe this embodiment, the four-arch type low NO that couples air staging and fuel staging of the present invention x The furnace of the W flame boiler is divided into two parts, the lower furnace 4 and the upper furnace 5. The lower furnace 4 is composed of the upper furnace arch 1a, the upper front and rear walls 2a, the lower furnace arch 1b, the lower front and rear walls 2b and the cold ash bucket 3; The powder burner 6 is arranged on the front and rear upper furnace arches 1a and communicates with the lower furnace 4 to feed the downwardly injected pulverized coal airflow 8; a plurality of graded air nozzles 7 are arranged in the middle of the upper front and rear walls 2a and It communicates with the lower furnace 4, and is used to introduce the classified air 9 to organize the classified combustion and carry the ignited pulverized coal airflow to continue downward; a plurality of superfine powder burners 6a are arranged on the front and rea...

Embodiment approach 2

[0019] combine figure 1 Describe this embodiment, the four-arch type low NO that couples air staging and fuel staging of the present invention x The pulverized coal burner 6 of the W flame boiler is inclined 5-15° outward relative to the vertical direction, the classified air nozzle 7 is inclined 45-60° downward relative to the horizontal direction, and the superfine powder burner 6a is inclined inward relative to the vertical direction Angle of 10~25°, cold ash hopper protection air spout 7a is tilted up 0~10° relative to the horizontal direction, burnout air spout 7b is tilted down 30~45° angle relative to the horizontal direction; pulverized coal flow 8, graded Wind 9, superfine powder jet 8a, cold ash hopper protection wind 9a and burn-off wind 9b all have wind speeds in the range of 40-60m / s. Other components and connections are the same as those in Embodiment 1.

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Abstract

The invention discloses a low-NOx four-arch type W flame boiler for coupling air staging and fuel staging. A furnace chamber is divided into two parts, namely the lower furnace chamber and the upper furnace chamber, and the lower furnace chamber consists of four furnace arches, a two-stage type front and rear wall and a dry bottom hopper; a pulverized coal burner inclined outwards is arranged on the upper furnace arch, declined staging air noozles are formed in the upper part of the front and rear wall, an ultrafine powder burner inclined inwards is arranged on the lower furnace arch, protective air noozles are approximately horizontally formed in the upper part of the dry bottom hopper, and over-fire air noozles inclined downwards are formed in the lower part of the upper furnace chamber. Therefore, the condition of coupling deep air staged combustion and fuel staged combustion is constructed in the furnace, and the boiler is supplemented with prolonged flame travel caused by unique combustion design and added flame fullness degree, so that low NOx combustion and high-efficiency after-combustion for the W flame boiler are realized.

Description

technical field [0001] The invention relates to a W-flame boiler, in particular to a four-arch W-flame boiler coupled with air classification and fuel classification, and belongs to the technical field of W-flame boiler combustion. Background technique [0002] W flame boiler adopts a variety of measures to strengthen the combustion of low-volatile coal and prolong the residence time of pulverized coal particles in the furnace, so it is considered to be more suitable for burning low-volatile coal (mainly anthracite and lean coal). A type of furnace. In order to maintain the stable combustion, timely ignition and good burnout of low-volatile coal, the furnace needs to maintain a high level of smoke temperature, and most boilers have a limited degree of staged combustion, which eventually leads to NO x Most emission levels are as high as 1200~1800 mg / m 3 . The "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), which was implemented on July 1, 201...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/00
Inventor 凌忠钱况敏曾宪阳
Owner CHINA JILIANG UNIV
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